Among the several options to solve PWR spent fuel accumulation problem in Korea, the dry storage method could be the most realistic and applicable solution in the near future. As the basic objectives of dry storage are to prevent a gross rupture of spent fuel during operation and to keep its retriev...
Among the several options to solve PWR spent fuel accumulation problem in Korea, the dry storage method could be the most realistic and applicable solution in the near future. As the basic objectives of dry storage are to prevent a gross rupture of spent fuel during operation and to keep its retrievability until transportation, at the same time the importance of a spent fuel integrity evaluation that can estimate its condition at the final stage of dry storage is very high. According to the national need and technology progress, two representative nations of spent fuel dry storage, the USA and Japan, have established different system temperature criteria, which is the only controllable factor in a dry storage system. However, there are no technical criteria for this evaluation in Korea yet, it is necessary to review the previously well-organized methodologies of advanced countries and to set up our own domestic evaluation direction due to the nation's need for dry storage. To satisfy this necessity, building a domestic spent fuel test database should be the first step. Based on those data, it is highly recommended to compare domestic data range with foreign results, to build our own criteria, and to expand on evaluation work into recently issued integrity problems by using a comprehensive integrity evaluation code.
Among the several options to solve PWR spent fuel accumulation problem in Korea, the dry storage method could be the most realistic and applicable solution in the near future. As the basic objectives of dry storage are to prevent a gross rupture of spent fuel during operation and to keep its retrievability until transportation, at the same time the importance of a spent fuel integrity evaluation that can estimate its condition at the final stage of dry storage is very high. According to the national need and technology progress, two representative nations of spent fuel dry storage, the USA and Japan, have established different system temperature criteria, which is the only controllable factor in a dry storage system. However, there are no technical criteria for this evaluation in Korea yet, it is necessary to review the previously well-organized methodologies of advanced countries and to set up our own domestic evaluation direction due to the nation's need for dry storage. To satisfy this necessity, building a domestic spent fuel test database should be the first step. Based on those data, it is highly recommended to compare domestic data range with foreign results, to build our own criteria, and to expand on evaluation work into recently issued integrity problems by using a comprehensive integrity evaluation code.
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제안 방법
All efforts for calculating the temperature of all system components are focused on lowering the fuel temperature under the safety criteria, which were established through spent fuel integrity evaluations. Therefore, in this work, it is very important to estimate the actual fuel cladding temperature as precisely as possible and evaluate the remaining engineering margin of the cladding within a target dry storage operation lifetime [4].
This demonstration test has focused on only spent fuel integrity, not the dry storage system. Spent fuel integrity will be periodically checked by a visual test before installation and by a Kr-85 inspection with temperature and pressure gauging on the cask lid.
Moreover, Used Fuel Disposition (UFD) which has been led by the US DOE is considering spent fuel management in the big picture including storage, transportation, and disposal [28]. This program is also participating in data acquisition examination of high burnup spent fuel and a joint demonstration with ESCP. These activities are expected to produce reliable research results for the listed items in Table 3.
This revision has also deployed the risk assessment concept to regulator’s reviewing process by classifying all checkpoints as high, medium, or low level.
성능/효과
In the results of the creep test, the transition threshold strain for the irradiated cladding was much larger than 1 %, and therefore the usual criteria of 1 % creep strain may be a sufficient engineering margin for thermal creep single effect. This means that thermal creep is not a significant degradation mechanism for spent fuel cladding in dry storage conditions.
후속연구
At the end of the 60 year demonstration, only a visual inspection is planned for the final spent fuel integrity for now. This demonstration is expected to show the public the reliability of the spent fuel integrity in real time and to reach a more positive consensus on long-term spent fuel dry storage.
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