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Nuclear accidents that lead to melting of a reactor core create heterogeneous materials containing hundreds of radionuclides, many with short half-lives. The long-lived fission products and transuranium elements within damaged fuel remain a concern for millennia. Currently, accurate fundamental models for the prediction of release rates of radionuclides from fuel, especially in contact with water, after an accident remain limited. Relatively little is known about fuel corrosion and radionuclide release under the extreme chemical, radiation, and thermal conditions during and subsequent to a nuclear accident. We review the current understanding of nuclear fuel interactions with the environment, including studies over the relatively narrow range of geochemical, hydrological, and radiation environments relevant to geological repository performance, and discuss priorities for research needed to develop future predictive models.

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Rodney C. Ewing
Rodney C. Ewing
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Sarah L. Bhatia
Beth Duff-Brown
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North Korea’s agreement to curb its nuclear and weapons programs is welcome diplomatic news. But it stops far short of addressing the world’s concerns about the isolated and unstable dictatorship.

Stanford experts David Straub and Siegfried S. Hecker discuss Pyongyang’s deal with Washington that will allow nuclear inspectors into North Korea and deliver much-needed nutritional assistance to the impoverished country.

Straub is the associate director of the Korean Studies Program at the Freeman Spogli Institute for International Studies. He is a former State Department senior foreign service officer who worked for more than 12 years on Korean affairs. He travelled to North Korea in 2009 with former President Bill Clinton as part of a delegation to secure the release of two journalists from Current TV.

Hecker is co-director of the Center for International Security and Cooperation and a senior fellow at FSI. Hecker has visited North Korea four times since 2004. During his last trip in 2010, he was shown a new light-water reactor at the Yongbyon nuclear center and a uranium enrichment facility.

What are some of the key factors that led North Korea to agree to this deal?

Straub: This year marks the 100th anniversary of North Korean founder Kim Il Sung’s birth, which the entire country will be celebrating April 15. The government has also said that this is the target year for North Korea to become a “strong and prosperous country.” Kim Jong Un is a brand-new leader, and presumably he and his advisors want to show that he is capable of feeding his people and at least managing the relationship with the United States.

How do you assess the agreement? Where does the moratorium put relations between the U.S. and North Korea?

Hecker: The moratorium demonstrates that North Korea is once again interested in diplomacy with the United States. The fact that they are willing to halt the nuclear operations at Yongbyon, especially the uranium enrichment activities, is a big step in the right direction. I believe the U.S. now wants to achieve a permanent halt to all nuclear weapons activities in North Korea, then roll them back, and eventually achieve complete, verifiable denuclearization of the Korean Peninsula.

Straub: There is no perfect deal when it comes to North Korea, but overall I think it is worth giving this one a chance. It will probably slow down the pace of nuclear and missile development in North Korea. In addition, it will give us time to explore whether there is any prospect that the new leadership in North Korea may be willing to take a different, more positive approach toward the United States and South Korea than its predecessors.  If history is a guide, the likeliest outcome is that after a period of several months to a few years the six-party talks will again break down, after which North Korea will create a new crisis.

How hopeful are you that this will lead to the capping of North Korea's nuclear capabilities and perhaps even its ultimate denuclearization?

Hecker: My advice to our government since November 2010, when I was shown the Yongbyon centrifuge facility, was to take immediate action so that the nuclear situation does not get worse. I advocated three no’s: no more bombs, no better bombs and no exports. The current agreement will limit the number of bombs because the Yongbyon nuclear facilities will observe a moratorium. We are still not certain of what they can produce at an undisclosed site, but I believe it is limited. The nuclear testing and missile launch moratorium will constrain the sophistication of their nuclear weapons. Denuclearization is important, but it remains a more distant goal.

Why does the United States call this “important, but limited progress”?

Straub: It is significant, in part, because since North Korea threw out international nuclear inspectors in 2009 there has been no outside monitoring of what is going on at the Yongbyon facility. But most of the things North Korea has agreed to could be reversed at will. Apart from the nuclear tests, the suspension of North Korean nuclear activities applies only to Yongbyon. Dr. Hecker and other experts have concluded there is no way North Korea could have constructed its uranium enrichment facility at Yongbyon so soon after the departure of international inspectors if had not already had another facility elsewhere. The agreement also does not address a number of non-nuclear issues, such as North Korea’s military attacks on South Korea in 2010. For there eventually to be lasting progress on the Korean Peninsula—including a resolution of the nuclear issue—there will have to be great improvement in relations between North and South Korea.

Based on what your 2010 visit to the Yongbyon nuclear facility, how much progress could they have made in terms of uranium enrichment?

Hecker: They told me they just brought up the centrifuge facility a week before we arrived in November 2010. They may have perfected the operations and produced some low enriched uranium feed material for the light-water reactor they are constructing (which is still at least a couple of years away from completion). It is also possible that they are still struggling to make the centrifuge facility work smoothly. It is very important to have the International Atomic Energy Agency inspectors get into the facility to see what progress has been made and to get a measure of how sophisticated their operations are. The North, in my opinion, still has only four to eight primitive plutonium bombs. I don’t believe they have the confidence to put a warhead small enough to fit on one of their missiles. We have little information on whether they have made highly enriched uranium or have tried to build a bomb fueled with highly enriched uranium.

What does this agreement say, if anything, about the new North Korean leadership?

Hecker: From what I know, this was pretty much the deal worked out the week before Kim Jong Il’s death. I think it’s a good sign; Kim Jong Un appears to be in control as indicated by the fact that he is able to offer up a similar deal even with his father gone.

Straub: This deal suggests that there is a great deal of continuity in North Korea’s leadership. The substance of this agreement is actually quite consistent with North Korean policies and priorities over the last 20 years. While there is no evidence to suggest that Kim Jong Un will adopt major new policies, there is always at least the possibility he might eventually.

The deal includes the provision of 240,000 metric tons of “nutritional assistance” to North Korea. What does the country’s food situation look like right now?

Straub: There is no doubt that many ordinary North Koreans are going hungry. The United States has termed this “nutritional assistance” to distinguish it from “food aid,” because officials are concerned that the provisions of bulk grain – especially rice – might be siphoned off by the North Korean elite. The U.S. government had said earlier that nutritional assistance would not involve bulk grain, and that it would be targeted toward especially vulnerable groups, such as lactating mothers, children, and the elderly.

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Our objective is to formulate and then build a capability that could focus on the design of influence in Global CASoS. Such a capability would allow evaluation of the cost benefit for policies imposed at a variety of scales and thus the design of policy combinations to most effectively achieve high levels of individual and/or communal health. Many of these policies have to do with Security: land and boarder security, food security, water security, energy security, commerce security, etc. As such, this effort lays a foundation for development of Trans-spectrum (i.e., resource, entity, scale) Global Security. An overview of this work will be presented for discussion.

About the speaker:

Robert Glass, Jr. is the 2011-2012 Perry Fellow at CISAC. Before coming to CISAC, he was a Senior Scientist in the office of Complex Adaptive Systems of Systems Engineering Initiative at Sandia National Laboratories, New Mexico. He has published in peer reviewed journals such as Critical Infectious Diseases, Emerging Infectious Diseases and Physica A.

He received a PhD and a M.S. from Cornell University in Agricultural and Biological Engineering and a B.S. from Haverford College.

Reuben W. Hills Conference Room

Robert Glass William J. Perry Fellow Speaker CISAC
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The nuclear weapons news of late has been alarming. David Sanger reported in "The New York Times" on January 9 that Iran's top nuclear official had announced his country was near initiating uranium enrichment at a new plant. And the recent leadership change in North Korea means added uncertainty about one of the world's most unpredictable nuclear weapons states. Both developments mean the danger is rising that nuclear weapons or the means to make them will spread in this year.

The ominous news brings to mind a comment that Robert M. Gates made a few years ago while working as President Obama's Secretary of Defense. "If you were to ask most of the leaders of the last administration or the current administration what might keep them awake at night," he told me, "it's the prospect of a [nuclear] weapon or nuclear material falling into the hands of Al Qaeda or some other extremists."

I was interviewing Gates for a book about nuclear threats. The book, "The Partnership: Five Cold Warriors and Their Quest to Ban the Bomb," [Harper, $29.99] examines the acute state of nuclear dangers today, including the spread of nuclear materials and technology to unstable nations like Pakistan, North Korea and Iran. If a terror group like Al Qaeda is ever going to get its hands on a nuclear weapon, or more likely the fissile material needed to make one, the source is likely to be one of those three nations. North Korea and Pakistan have a frightening history of exporting nuclear weapons technology. Iran may be next.

Despite the denials of Iranian leaders, Tehran seems well on the way to building its first nuclear weapon. Iran already has enough enriched uranium to make several warheads once the uranium is raised to a higher level of enrichment. The enrichment process can move very quickly from a low level to high, bomb-grade levels. Some upgrading of known Iranian enrichment facilities are required to get there, and these changes would be visible to the outside world. Still, Iran may well have hidden enrichment programs already cranking out highly enriched uranium. If it does move openly to higher enrichment, Israel and the United States will be tempted to attack Iran's nuclear installations.

A simple but powerful nuclear weapon can be fabricated with just a small amount of highly enriched uranium. The hardest part of making a uranium bomb is producing highly enriched uranium, something that requires advanced, industrial-scale technologies beyond the reach of a terror group. But with just 60 pounds of highly enriched uranium, a small, savvy group of engineers with some basic laboratory equipment could construct a fission bomb in a garage. The bomb mechanism is so straightforward that the United States did not bother to test a uranium weapon before dropping one over Hiroshima in 1945. And it is not wildly improbable to imagine Iran giving highly enriched uranium to a terror group.

The continuation of the Kim dynasty in North Korea - now in its third generation with the recent installation of Kim Jong-un as the new supreme leader - does not augur well for more responsible behavior by North Korea. With its active nuclear weapons program, hunger for hard currency and record of selling nuclear weapons goods to Libya and Syria, North Korea is one of the most dangerous nations on earth.

While North Korea is unlikely to sell a nuclear weapon to a terror group, it could provide the materials and knowhow to make a crude but powerful bomb. The United States, for all its intelligence-gathering hardware like spy satellites, does not know a great deal about the North Korean program. Washington was surprised to learn in 2010 that North Korea had constructed a uranium enrichment plant outfitted with the latest centrifuge technology. News about the existence of the plant came from a group of American scholars who were shown the facility during a visit to the North Korean nuclear complex at Yongbyon.

The plant is not a problem if it is producing low enriched uranium to fuel a small, light water reactor. But the plant could be used to produce highly enriched uranium. The rapid construction of the plant - it was built in just 18 months - suggested that the North Koreans might have honed their techniques at another enrichment facility, as yet undetected by the United States.

I recently asked my Stanford colleague Sig Hecker, one of the scholars who visited the enrichment plant in 2010, to outline what to watch for in the North Korean weapons program in coming weeks to determine if the new leadership is planning any change in nuclear policy and/or operations. Sig served as director of the Los Alamos National Laboratory 1986-1997. He has been a frequent visitor to North Korea, one of the few Americans to get a first-hand look at the North Korean nuclear program.

His response:

I believe that there will be a period of quiet on the diplomatic front, both for mourning and to rethink strategy. Just before Kim Jong-il died, American and North Korean diplomats came close to an agreement of American food aid in return for some concessions on the nuclear program (some reports indicated that Pyongyang would stop enrichment - but I have yet to hear official confirmation from the UnitedStates - and we never may). What to look for is to see when North Korean diplomats are ready to re-engage with Americans in quiet bilateral talks, mostlikely in China.

On the technical front: I would expect "normal operations" at Yongbyon. That means they will continue with the experimental light water reactor construction- although little will be seen from overheads because it is winter time. Much of the interior components will be fabricated in shops. I also expect them to continue with operations of the centrifuge enrichment facility - either to make more low enriched uranium for reactor fuel or to get the facility to operate fully (which it may not have been when we visited). Both of these operations will continue regardless of which way Pyongyang eventually decides to go with the nuclear program. I don't see any reason why they would cut back on these operations now.

As for potential provocative actions - they could prepare for another nuclear test -- but that is highly unlikely, if for no other reason than it is winter. Their tests occurred in October 2006 and May 2009. Nevertheless, the third test tunnel appears to have been dug some time ago (South Korean news reports and overhead imagery) and one should watch closely for activity at the test site (particularly come spring). We should also look for potential missile tests - the new launch site on the west coast should be watched for another potential long-range missile launch. (They have had three attempts from the old launch site in the east: 1998 over Japan, 2006 a complete failure, and 2009 two out of three stagesworked.) They also have not flight-tested the Musudan road-mobile missile."

It would not surprise me if North Korea conducted another nuclear test in 2012. If Kim Jong-un is looking for a way to flex North Korean military power and remind his impoverished people that their nation matters to the rest of the world, detonating a nuclear weapon will do the trick.

Iran's nuclear program will also likely generate news and international anxiety this year. Iranian threats to attack US naval vessels in the Persian Gulf may seem self-defeating, but a military confrontation between Iran and the United States is not out of the question.

There is no greater danger to American and global security than the spread of nuclear weapons and the means to make them.

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Philip Taubman
Philip Taubman
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Congratulations to Anand Habib, selected this weekend for a Rhodes Scholarship. Habib, 22, of Houston, Texas, is a 2011 graduate of Stanford, where he earned a bachelor's degree in biology, with honors in international security studies. He plans to pursue a master's degree in public policy and in medical anthropology at Oxford.

Habib is currently working on community health programs at St. Joseph's Clinic in Thomassique, Haiti, under a one-year global health fellowship awarded by Medical Missionaries. The nonprofit organization is a volunteer group of more than 200 doctors, nurses, dentists, and others who work to improve the health of the poorest of the poor in the United States and throughout the world.

In 2011, he won a Deans' Award for Academic Accomplishment which honors extraordinary undergraduate students for "exceptional, tangible" intellectual achievements. One of the professors who nominated him for the award described him as a "superb critical thinker" whose work is characterized by "creative genius" and "mature insights," adding that he "exemplifies exactly the kind of deeply informed, pragmatic and caring leadership that the world needs and Stanford enables."

As a Stanford student, Habib worked on behalf of politically and medically disenfranchised people in India, Mexico and Guatemala. On campus, he turned the Stanford tradition of the annual Dance Marathon into a vehicle dedicated to addressing the HIV/AIDS pandemic by engaging not only Stanford students but also local communities and corporations, raising more than $100,000. His exceptional work was recognized by his participation in the Clinton Global Initiative University Conference in April, 2011.

From Haiti, Habib discussed his current position, his plans in Oxford, and how his CISAC thesis relates to his work. 

What are you currently working on? 

I am currently working on a global health fellowship with an NGO that operates a clinic in Haiti's Central Plateau. As part of the fellowship I am helping to manage a number of community and public health projects including fortified salt (to counter iodine deficiency and filariasis), a point-of-use potable water system, a malnutrition intervention program, and a small system of community health committees and community health workers. For the past two months, I've taken on a number of administrative functions along with my co-fellow, who is also a recent college graduate. I started the fellowship shortly after graduation at the end of June 2011 and I am slated to be in Haiti until the end of June 2012.

What will you do at Oxford?

I proposed two one-year Masters programs: a masters in public policy from Oxford's new Blavatnik School of Government, and an M.Sc. in medical anthropology. As of now, I'm thinking of sticking with my proposed programs -- probably pursuing the medical anthropology degree first as it is a bit more theoretical. I think it would be better to have the more "academic" experience first before gaining the practical tools that an MPP will hopefully afford me. After a short send-off in Washington, D.C., at the end of September 2012, I will fly with the other American Rhodes Scholars-elect to Oxford the first week of October with term beginning shortly thereafter.

How does your work in the CISAC Honors program relate to what you are currently doing, your plans for Oxford, or what you'll be doing afterward? 

My honors thesis has allowed me to contextualize my experiences in Haiti in some fairly amazing ways. Two very persistent issues in Haiti are that of poor governance -- e.g. lack of strong regulatory structures, lack of government effectiveness, etc. -- and ineffective aid modalities, or the ways in which aid is delivered. My thesis was situated exactly at this nexus: how to deliver aid more effectively in order to improve governance. Ninety-nine percent of relief aid after the 2010 earthquake in Haiti was funneled to non-state organizations and only 12 percent of recovery aid went toward supporting government activities. In Haiti, I've witnessed how detrimental a patchwork system of NGO activity can be with little coordination between NGOs and little harmonization of NGO activities with government objectives. It becomes very frustrating at times, because, if my thesis is any indication, things need not be this way if both NGOs and states were engaged in collaborative partnerships -- along the lines of what Dr. Paul Farmer, deputy U.N. special envoy to Haiti, calls "accompaniment."

My initial interest in the topic of global health financing was spurred by work out of Oxford's Global Economic Governance Project. The director of the project, Dr. Ngaire Woods, was actually named the Dean of the Blavatnik School of Government through which the MPP is offered. I'd love to continue exploring the issues broached in my thesis at Oxford -- especially issues of aid effectiveness and sustainable systems of delivering development aid for health. In the future, I hope to become a physician-policymaker, helping to not only deliver care to individuals in difficult conditions around the world, but also in fostering more robust global health governance.

- Interview by Michael Freedman

 

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The large-scale industrial accident at the Fukushima-Daiichi Nuclear Power Plant was the culmination of three inter-related factors: external natural hazard assessment and site preparation, the utility’s approach to risk management, and the fundamental reactor design.

The reactor accident was initiated by a magnitude 9 earthquake followed by an even more damaging tsunami. However, it was the inability to remove the decay heat in the reactor core that led to core meltdown and radioactive release.

A review of the timeline of the major Fukushima accident sequences: The plant first experienced a station blackout (i.e. loss of all offsite and onsite power) due to flooding of backup critical emergency cooling equipment. The lack of an ultimate heat sink led to the fuel overheating. Subsequently, the generation of hydrogen through steam oxidation of of the fuel cladding led to chemical explosions causing significant structural damage.

The focus of this talk (presentation slides below) is on the engineering aspects of the reactor accident and the prospects for local environmental recovery. Radionuclide measurements in space and time provide important evidence for the exact evolution of fuel damage leading to partial core melting in multiple units. A review of the spent nuclear fuel pools is given where isotopic water composition and visual inspection images provide important evidence for the condition of the spent nuclear fuel.

While it will be several months to a year before we will be in a position to learn most of the lessons from this tragdy, several conclusions about defensive design, mitigation actions, and emergency response have been drawn by international organizations.

While the public health impact appears to have been low, the economic and nearby environmental consequences are severe, There is no doubt that land restoration will take over a decade and perhaps much longer. A review is given of actions taken by the Japanese government for land recovery in areas such as decontaminating top soil and local farmland as well as highly radioactive water used during ‘feed and bleed’ cooling of the core.

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The Center for International Security and Cooperation is pleased to announce the selection of 13 rising seniors for participation in its Undergraduate Honors Program in International Security Studies. 

The program provides an opportunity for eligible students focusing on international security subjects in any field to earn an honors certificate.

Students selected intern with a security-related organization, attend the program's honors college in Washington, D.C. in September, participate in a year-long core seminar on international security research, and produce an honors thesis with policy implications.

 

Joshua Alvarez

International Relations, Minor in Economics

Identity and Security: Turkey's Grand Strategy in the Middle East

 

Keshia Bonner

International Relations, Minor in Economics

United States Policy Towards Hamas and Hezbollah as State Actors

 

Stephen Craig

Political Science

Security Issues and Domestic Constraints on European Integration

 

Noura Elfarra

Political Science

How does Regime Change and Revolution Affect the Secret Police?

 

Alison Epstein

International Relations

British and American Intelligence Cooperation: the Iraq Inquiry and the New Face of the Special Relationship

 

Peter Hong

Political Science

Recalibrating and Resolving Deficiencies in Multinational Nuclear Fuel Cycle Initiatives

 

Mohammad Islam

Electrical Engineering, Minor in International Relations

Domestic Terrorism Prevention Strategies in the US and UK

 

Suraya Omar

Materials Science and Engineering

North Korea's Ambitions for a Light Water Reactor

 

Clay Ramel

Science, Technology & Society – Energy Engineering Concentration

National Security Dimensions of Developing an Energy Secure United States 

 

Nick Rosellini

International Relations, Minor in Economics & Modern Languages

The NATO Strategic Concept: Evolution of a Nuclear Posture 1957-2010

 

Ram Sachs

Earth Systems, Minor in Modern Languages

Environmental Dimensions of Security - Yemen and Violent Extremism

 

Jeffrey Sweet

Materials Science and Engineering

The Effect of Public Perceptions of Diseases such as HIV, H1N1, SARS, and Anthrax on the Effectiveness of Controlling Epidemics

 

Reagan Thompson

International Relations, Minor in Chinese

The Chinese Influence in Africa: Case Studies of Ghana and Angola


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As Japan's nuclear troubles continue, CISAC's Alan Hanson discusses the range of scenarios and how to prevent catastrophe.

CISAC: What is the range of events that could happen over the next several days and weeks?

Alan Hanson: The earthquake and resulting tsunami that hit northern Japan last Friday are unprecedented in modern times. These two nearly simultaneous natural disasters did significant damage to the Fukushima nuclear power stations operated by the Tokyo Electric Power Company (TEPCO). Despite this damage, including a total loss of off-site power and emergency backup power, TEPCO personnel have been making a heroic effort to bring the situation under control. To date off-site releases of radiation appear not to have had severe effects to the local population; because of prevailing westerly winds, the radiation releases have not been in the direction of major population centers.

It is impossible to predict the sequence of events that will unfold over the next few days and weeks. Under the best of circumstances, TEPCO will continue to take actions limiting further releases. To do so they must continue to cool the nuclear fuel in two separate regions of each reactor in the two stations; these regions are the reactor core itself and the used fuel storage pool. This means that enough water must be continually injected to keep the fuel covered. More dire circumstances could occur if the nuclear fuel is uncovered for a lengthy period of time. In the reactor core, this could lead to partial or total fuel melting, followed by failure of the primary steel containment due to excessive heat and pressure. Since some fuel has been uncovered for some time intervals, it is believed that partial melting may have already occurred and that the primary containment has been damaged in one or two of the reactors. If used fuel in the storage pools is uncovered, it could lead to fuel cladding failures from high temperatures releasing radioactive gases directly into the atmosphere. In a very unlikely scenario burning of the fuel cladding would release more gases and also particulate matter into the atmosphere. The reactor cores are of immediate concern because that is where the highest temperatures are located. The fuel pools become of greater concern over the intermediate term as water is boiled off or if some other event causes draining of a pool.

CISAC: What can be done to prevent the worst?

Hanson: Both worst-case scenarios described above can be prevented by keeping the nuclear fuel covered with water by any means available including the use of sea water, which has been initiated already. The weather will play an important role, too. As long as winds blow radioactive gases off shore and away from population centers, the public health effects should be minimal; if winds shift and blow toward Japanese cities, the situation would be significantly worse.

CISAC: How can we prevent this sort of thing from happening again?

Hanson: It is too early to speculate about the possibility of future accidents such as this one. Suffice it to say that the combination of a magnitude 9.0 earthquake and a 30-plus foot tsunami is a highly unlikely event. If early reports from the site turn out to be true, the reactors rode out the earthquake reasonably well and all of them shut down in the orderly fashion planned for an earthquake. Without the subsequent tsunami, it is very doubtful that the ongoing crisis at Fukushima would be anywhere near the magnitude we are witnessing. The nuclear industry has a good record of learning from accidents and making the appropriate changes to prevent reoccurrence or to at least mitigate the consequences should something similar happen in the future. Actions will certainly be taken by the industry and regulatory bodies in this vein once the immediate emergency is behind us.

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CISAC scholars made international news in November after North Korean scientists revealed to them that they had started construction on a small light-water reactor and completed a new uranium enrichment facility. The revelation dramatically changes the security calculus in Northeast Asia. In a Foreign Affairs article, Siegfried S. Hecker argues that denuclearization remains the goal. But that will take time. Now Washington should pursue a policy that begins with what he calls "the three no's -- no more bombs, no better bombs, and no exports -- in return for one yes: Washington's willingness to seriously address North Korea's fundamental insecurity." In a piece in the Bulletin of the Atomic Scientists, Hecker said "this approach may just be enough to get Beijing to take a much more aggressive stance to help shut down Pyongyang's nuclear import and export networks."
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