South Korea (S.K.) has warned North Korea (N.K.) that it would seek to terminate the Kim Jong Un regime if nuclear weapons were used in practice. S.K. called N.K’s nuclear intimidation a “grave challenge” to the international community.
     Yoon Suk Yeol is the President of S.K. He said in a speech to celebrate S.K. Armed Forces Day, “Despite repeated warnings from the international community over the past several decades, North Korea has been upgrading its nuclear and missile capabilities. Moreover, it has been blatantly threatening to use nuclear weapons. If North Korea uses nuclear weapons, its regime will be brought to an end by an overwhelming response from the Republic of Korea (ROK)-U.S. alliance.” He called N.K.’s nuclear gamble an “existential threat” to S.K. He went on to say that it posed a “grave challenge” to global peace.
     The S.K. President stressed that “Our people will never be deceived by the fake peace tricks of North Korea’s communist regime, its followers and anti-state forces.” He added that S.K. will further strengthen trilateral security operations with Washington and Tokyo.
     Yoon’s comments are the latest in a series of warnings amid rising tensions and N.K. accelerated provocations. N.K. just announced a new law dealing with its use of nuclear weapons in September of 2022. In the new legislation, N.K. delineated the circumstances under which nuclear weapons could be used. N.K. said that it has the option to deploy nuclear weapons not merely as a retaliatory measure, but also in a preemptive strike to bolster its deterrence capabilities.
     The legislation grants N.K. the authority to use nuclear weapons preemptively in scenarios where:
• A weapon of mass destruction launch or approach is assessed,
• A nuclear or non-nuclear assault on the state leadership and the command structure of the state’s nuclear forces is initiated or deemed imminent,
• A lethal military attack on significant strategic assets of the state is initiated or imminent.
     Yoon said, “The North Korean regime must clearly realize that nuclear weapons will never be able to guarantee its security.” He vowed that he would expand the scope of the U.S.-S.K. alliance into the space and cyber domains to further strengthen the allies’ capabilities.
     Yoon also pinpointed the N.K. regime’s most vulnerable point. He said, “The North Korean regime’s obsession with the development of nuclear weapons aggravates the North Korean people’s suffering. It continues to exploit and oppress its people and violate their human rights.”
     S.K. has indicated that it would continue to raise the issue of human rights in N.K. S.K. appointed a N.K. defector as its top policy aide earlier this month, underscoring the Yoon administration’s renewed stance towards a more hardline policy on N.K.
     Yoon’s warning came a day after N.K. labeled him “politically immature”, a “diplomatic idiot” and a “trash-like head.”
     This verbal exchange between the Koreas followed Yoon’s harsh message to N.K. and Russia at the U.N. General Assembly recently. He vowed that Seoul and its allies “would not just stand idly by,” if the two authoritarian states pursue military cooperation.
     In a bilateral summit earlier this month, Russian President Vladimir Putin had offered to aid N.K. in perfecting his “satellite” technology.
      Yoon is politically conservative. He has been seeking to align S.K.’s foreign policy stance with the U.S. to counter global challenges including N.K.’s nuclear ambitions.

     Finland’s Radiation and Nuclear Safety Authority (STUK) reported that its review of Posiva Oy’s operating license application for the world’s first spent nuclear fuel disposal facility is taking longer than expected. It will not be completed by the end of 2023 as planned.
    Radioactive waste management company Posiva submitted its application and related information to the Ministry of Economic Affairs and Employment (TEM) on December 30th of 2021 for an operating license for the spent nuclear fuel encapsulation plant and final disposal facility under construction at Olkiluoto Nuclear Power Plant located in Eurajoki, Region of Satakunta. The underground spent nuclear fuel repository is expected to start operations in the mid-2020s. Posiva is also applying for an operating license for a period from March 2024 to the end of 2070.
     The Finnish government will make the final decision on Posiva’s construction application. However, a positive opinion by STUK is required before the government acts. The ministry requested STUK’s opinion on the application by the end of this year. The regulator started its review in May of 2022 after concluding that Posiva had provided sufficient material. However, STUK has now said that its safety assessment and opinion on the application will not be finished this year.
     STUK said, “Overall, STUK has progressed well in processing the application for an operating permit, but it is still in progress. The data is large and STUK has also required Posiva to update parts of it. Consequently, the work has lasted longer than expected. When STUK has received the processing of the operating license application material submitted by Posiva, it will prepare a safety assessment, which will be attached to the safety statement prepared for the operating license application.” STUK said that it is preparing to propose to the ministry to postpone the deadline for the submission of its opinion on the application.
     STUK said it cannot estimate how long it will take to submit its opinion. Päivi Mäenalanen is STUK’s project manager. He said, “It depends not only on STUK but also on Posiva and how quickly it can deliver the missing material to us. However, there is no question of any dramatic delay.”
     The site for Posiva’s repository was chosen in 2000. The Finnish Parliament approved the decision-in-principle on the repository project in 2001. Posiva submitted its construction license application to TEM in December of 2013. The company studied the rock at Olkiluoto. It prepared its license application using results from the Onkalo underground laboratory. The laboratory is being expanded to form the basis for the spent nuclear fuel repository.
     The Finnish government granted a construction license for the project in November of 2015. Construction work on the repository began in December of 2016.
      Once it receives the operating license, Posiva can begin the final disposal of spent nuclear fuel generated from the operation of Teollisuuden Voima Oyj’s (TVO) Olkiluoto and Fortum’s Loviisa nuclear power plants. The operation will last for about one hundred years before the nuclear waste repository is closed and permanently sealed.

     Rishi Sunak is the Prime Minister of the United Kingdom (U.K.). He says that Wylfa, on Anglesey, will be named as one of the preferred sites for a new nuclear power station within months. He called it a “fantastic site” that could host both small modular reactors (SMRs) and big conventional reactors. Sunak said, “Wylfa is somewhere that could do both” He added that the preferred sites would be announced later this year.
     Sunak called SMRs the “nuclear technologies of the future.” They are nuclear fission reactors that produce less than three hundred megawatts of electricity. It has been claimed that they will be cheaper and safer than old full-sized reactors.
     The original Wylfa nuclear power setation stopped producing electricity in late 2015. Last year, the U.K. government launched its Energy Security Strategy. Wylfa was mentioned as one of the possible sites for new nuclear builds.
     Sunak told a reporter that he was “committed to nuclear power in general because it is an important part of how we deliver energy security in the UK, but also how we decarbonize over time to get to net zero but in a proportionate and pragmatic way. Now Wylfa is a fantastic site because it can do both potentially giga-watt power but also could do small modular reactors. Without getting into too much of the specifics, later this year we will be announcing the sites for the next stage of our SMR process on small modular reactors. I can’t say much more before then but obviously Wylfa is somewhere that could do both.”
     Last may a report by the Welsh Affairs Committee urged U.K. ministers to show “more concrete commitment” to a new nuclear power station at Wylfa. The report warned that Hitachi’s cancelled bid to construct one in 2020 had “scars on the local community”.
     Sunak made a passionate defense of the U.K. government’s deal with Tata to keep Port Talbot steelworks open which was announced earlier this month. The Port Talbot plant is the biggest steel plant in the U.K. It is slated to receive a subsidy of six hundred twelve million dollars from taxpayers to install an electric arc furnace to produce steel in a greener way. However, as many as three thousand jobs will be lost across the U.K., mainly in Port Talbot. Unions are calling the deal a “devastating blow for workers.”
     Sunak said denied the charge that the plans were not ambitious enough. He said, “I think it is a very glass half empty way to look at it. That steel plant was facing compete closure – 8,000 jobs would have been lost, that’s what people were worried about. What’s happened here is that the government has stepped in, that’s the UK government not the Welsh government, the UK government has stepped-in and provided an enormous amount of support to help that steel plant have a sustainable long-term future, producing clean steel and saving 5,000 jobs. That actually, compared to what the situation was, shows that the UK government is committed to the people of Wales, committed to steel-making and can look forward to a much more sustainable future for the plant and that area.”

     The transporting of heat is an important part of our daily life, from boiling a pot of water to creating complex carbon-free energy technologies that power our cellphones, laptops, and home appliances.
     Nuclear energy is an example of heat transfer. It has a proven track record spanning over seventy years. Nuclear power provides about twenty percent of the total electric energy generation in the U.S. A nuclear reactor is similar in principle to a fossil energy plant in that thermal energy (heat) is used to generate steam. The steam is then converted to electricity using a steam turbine. As the nuclear industry moves to advanced fuel cycle technologies, efficiently transporting heat energy becomes increasingly important. Meeting this challenge requires an understanding of microscopic mechanisms that control the transport of that heat.
     In typical nuclear fuel, a uranium atom absorbs a neutron, becomes unstable and splits which results in the creations of two new lighter atoms. This process imparts sufficient kinetic energy to these new atoms to displace thousands of adjacent atoms from their equilibrium positions. This causes the creation of microscopic defects in the crystalline structure. Furthermore, this process produces heat that must flow through the fuel element. Then the heat must be transferred out of the coolant. Finally, the heat must produce steam for making electricity. The crystalline defects degrade the ability to transfer heat. This is a quality known as its thermal conductivity.
     David Hurley is an Idaho National Laboratory Fellow and director of the Center for Thermal Energy Transport under Irradiation (TETI) which is an INL-led Energy Frontier Research Center supported by the Department of Energy’s Office of Science. He said, “Over the lifetime of the fuel in a reactor, its thermal conductivity decreases by as much as 70%.”
     The degradation of a nuclear fuel’s thermal conductivity is a challenge for efficient nuclear power operations. However, researchers are learning that this degradation can be mitigated by improving the design of the chemistry and structure of the fuel. Fully achieving these mitigation strategies will require going beyond trial-and-error investigative approaches.  
     This is where TETI comes into play. The mission of the center is to accurately predict and ultimately improve the transport of thermal energy in nuclear fuels in extreme radiation and temperature environments. Hurley said, “Because our materials of interest contain uranium, quantum mechanical approximations such as density function approximations all fail at some level. What sets TETI apart is its ability to tackle this problem while staying as close to the first principles of quantum mechanics as possible.”  
     In its first four years, TETI scientists utilized inelastic neutron scattering to gain critical new insights into resolving the atomic scale mechanisms governing thermal transport in defect free, ceramic nuclear fuels. TETI scientists also applied beyond density functional approximation in order to discover a new energy state of uranium oxide, lower than previously reported. Linu Malakkal is one of the principal investigators on the TETI team. He said, “The lowest energy state is the correct state, and we are getting very close.”
     Hurley said, “As we look to the future, it is important to realize that the tools developed by TETI researchers will not only impact advanced nuclear energy concepts but will offer opportunities for other energy-related technologies beyond nuclear energy, such as thermoelectric or photoelectric energy conversion, and/or new quantum materials.”