DEVELOPMENT OF AN ADVANCED SPENT NUCLEAR FUEL STORAGE SYSTEM (TOPIC H-6, HLW AND SPENT FUEL STORAGE SYSTEMS-TECHNOLOGIES AND EXPERIENCE)

摘要

The basic design work was performed for a new vault storage system which has high storage capacity. Two canisters, with 10-40 BWR spent fuel assemblies each, are vertically inserted in line into a storage tube. The storage room is radiologically shielded and an air flow separation baffle is installed horizontally in the middle of the area holding the storage tubes. The cross flow air generated by the stack effect removes decay heat from the spent fuel. Heat removal and radiological shielding have a critical importance for the safety aspects of the dry storage system, especially if high storage density is to be realized. A heat removal evaluation was done using a hydraulic analysis benchmarked by the results of small model experiments and a shielding evaluation was done using the MCNP-4A Monte Carlo transportation code. Feasibility of the system regarding these aspects was confirmed.