| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 90 === Decay heat generated by the decay of radionuclides in spent nuclear fuels is one of the major consideration influencing the design and safety of a potential disposal facility. Deep geologic disposal achieves the isolation and retardation of nuclide migrating by multiple barrier (made up of waste package, buffer material, backfill material and host rock). In this way, before nuclide reaches ground, the decayed radioactivity will have no harm to human body.
This study is performed according to the preliminary size design of INER (Institute of Nuclear Energy Research), 2002. It is aimed to obtain the distribution of temperature field with respect to space and time in a repository space environment by using the code ABAQUS. Also estimated is the highest temperature and its timing in the disposal environment. The result can be used to assess the stability and safety of facility design based on the disposal concept.
The analytical results show the space influence of deposition hole inside the multiple deposition holes environment. By considering the original space design area 6*40(short direction* long direction)M² as a standard , we change long direction’s space and short direction’s space and compare their differences with SKB design criteria. For long direction’s space comparison, the area 6*60M² approximately can confirm the criteria. For short direction’s space comparison, the area 8*40M² can confirm the criteria. If we adopt the criteria of canister’s surface temperature lower than 100°C, then the area 6*40 M² can confirm the criteria.
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