Abstract
The Horizontal Modular Storage System is the dry storage system for the spent nuclear fuel, which was developed in the USA. It is one of the candidacy concepts for the interim spent fuel storage facility installed at away from reactor in Japan. We performed the conceptual design to reduce cost and to meet Japanese safety guidelines, rules and standards, fuel specifications and seismic conditions.
To meet Japanese conditions, the heat removal characteristic, the shielding characteristic, the aseismic characteristic and the required space are improved.
We also performed the experiments of the thermal hydraulics in the canister to confirm the heat removal characteristic of the system. The results show that the natural convection of the helium in the canister is effective to remove the residual heat from the spent fuel and the effect is improved when the helium is pressurized.
The storage experience in the USA and the results of this study show, the Horizontal Modular Storage System is acceptable for the interim spent fuel storage facility installed in Japan.
