SUBCRITYCALITY ANALYSIS OF HTR-10 SPENT FUEL CASK MODEL FOR THE 10 MW HTR INDONESIAN EXPERIMENTAL POWER REACTOR

Abstract

The 10 MW HTR Indonesian Experimental Power Reactor (RDE reactor) is designed identical with the HTR-10 in China, conceptually.  However, the review results showed that the spent fuel cask model which is used between two reactors is fully different, such as size and capacity. The proposed cask model in RDE reactor can hold 15 times more fuel pebbles than HTR-10 has.  This research activities deal with the subcriticality analysis for the spent fuel cask of RDE reactor if using the HTR-10 cask model.  The subcriticality condition is designed to meet the limit of safety value.  The objective of this research is to determine the subcriticality value in the normal and accident events for the spent fuel cask when it is in the reactor building and the spent fuel cask room.  All calculations were carried out by MCNP6.1 code.  The selected external events are the water ingress (reactor room), water flood and the combination event of water flood and earthquake.  The calculation results showed that the maximum value of k_eff (3σ) are  0.47510 and 0.19214 for the cask in the reactor building and in the spent fuel cask room, respectively.  This value is far from the limit value of 0.95. The calculation results showed that the spent fuel cask are in the safe condition eventhough in the worst combination events, the cask is flooded and earthquake. The HTR-10 spent fuel cask can be proposed as an alternative for the RDE reactor to get an efficient reactor building.