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제안 방법
- The test MPC was slightly deformed near the impacted area. He leak tests were performed before and after the drop tests to confirm the integrity of the leak-tightness of the test MPCs (especially welded lids) against impact loads. Measured leakage rates showed the integrity of the leak-tightness at the lids and MPC shell, as all values were under 1.
- Key issues of these studies include the safety requirements in the operation and maintenance during spent fuel storage and unloading/loading for transportation, long-term integrity of metal canisters and concrete materials, etc. In 1997, CRIEPI completed the research program of the demonstration test for the interim storage of spent fuel, mainly involving concrete cask storage technologies, to reflect the technical requirements issued by NISA.
- The JNES tests were composed of hydride effect evaluation testing, irradiation hardening recovery testing, and creep testing. In hydride effect evaluation testing, hydride reorientation testing has been performed in order to evaluate the correlation between hydride reorientation behavior and conditions, such as hoop stress, temperature, and cooling rate for BWR and PWR irradiated cladding tubes.
- The report describes alternative measures for the visual inspection of the fuel basket and spent fuel, and inner pressure measurement. The report concluded that records and documents before and during storage could be alternative measures for the necessary inspections. The report added that more data on the long-term integrity of the metal cask and spent fuel shall be continuously accumulated.
- Transport/storage working groups of the NISA/METI of the Japanese government have issued a report19. The report describes alternative measures for the visual inspection of the fuel basket and spent fuel, and inner pressure measurement. The report concluded that records and documents before and during storage could be alternative measures for the necessary inspections.
- s. Two drop tests in the horizontal and vertical orientations were conducted considering non-mechanistic drop or impact events during handling, and the drop heights were 1m and 6m, respectively. Regarding contents of MPC, dummy steel structures equal to the total weights of the spent fuels (14.
- Two types of concrete casks, a reinforced-concrete cask (RC cask) and concrete-filled-steel cask (CFS cask) to store the high burn-up spent fuel, were designed. The preliminary designs for the two types of cask, the RC cask and CFS cask, were employed as the basic structure, as shown in Fig.
대상 데이터
- In the type-II model, the cask body is made of ductile cast iron, and the lid is made of stainless steel. In this model, an inner metal gasket (enveloped with silver), and an outer rubber gasket (silicone rubber) were installed. In both models, the test temperature (130~140℃ at the secondary lid) was maintained with the electrical heaters installed in the cask cavities.
- In the I-type model, the cask body and lid are made of forged carbon steel. The sealing surface is overlaid with stainless steel welding (SUS304), and a double metal gasket (enveloped with aluminium) is installed. In the type-II model, the cask body is made of ductile cast iron, and the lid is made of stainless steel.
- 16 shows overview of a full-scale metal cask model for impact analysis. This model has been designed as metal cask for dry storage and transportation installing 21 PWR-type fuel assemblies.
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