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Report No.

Water experiment and numerical simulation on failed fuel detection and location system of Japan sodium-cooled fast reactor (JSFR)

Aizawa, Kosuke ; Oshima, Jun*; Kamide, Hideki ; Kasahara, Naoto

A selector-valve type failed fuel detection and location (FFDL) system is applied to the JSFR design that has an upper internal structure (UIS) with a slit above the core and several sampling nozzles for the FFDL are set in the UIS around the slit to detect the fission product (FP) from the subassemblies below the slit. Therefore, mixing process in the UIS should be known and appropriate arrangement of the sampling nozzles in the UIS is needed. A water experiment using a 1/5-scle model was carried out. Experimental results showed that the sampling nozzles set in the UIS detected the FP simulant concentration within the criteria of FFDL signal detection. In addition, identification of the failed fuel subassembly under the UIS slit was achieved by means of comparing concentration profiles in the UIS. A numerical simulation using a CFD code was carried out. The simulation results showed that the simulation predicts the FP concentration distributions.



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Category:Nuclear Science & Technology



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