Abstract

Fast Breeder Test Reactor (FBTR) which is a loop type, sodium cooled fast reactor, is one of the high flux - high temperature reactor in India with design power of 40 MWt (13.2 MWe). The design target power of 40 MWt was achieved with a core configuration with 68 Mark I (MK I) fuel subassemblies. A study has done to evaluate the variation in the power of fuel subassemblies which are closer to the source subassembly. Source subassembly in FBTR is a gamma neutron source (Sb2O3-Be) located in (05, 28) location. The study found that the presence of the source subassembly increases the power of the neighbouring fuel subassemblies. The variation in power due to the source subassembly is found to be 10% for fuel subassemblies in (05, 29) location and for other fuel subassemblies in 3rd, 4th & 5th ring, it is within 3.5%. The estimated LHR and power of the fuel subassemblies closer to the source subassembly are well within the permissible limits.

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