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Results from the run-beyond-cladding breach irradiation of a predefected fuel pin (RBCB-7). [LMFBR]

Technical Report ·
DOI:https://doi.org/10.2172/5489290· OSTI ID:5489290

A slit was machined through the cladding of an irradiated fuel pin and irradiation in the Experimental Breeder Reactor-II (EBR-II) was resumed. The condition of the fuel pin was continuously followed with delayed neutron (DN) monitors. When the DN signal increased to a previously established administrative limit of 800 counts per second, the test was terminated. Postirradiation examination showed the sodium-fuel reaction caused fuel pin swelling and extension of the machined slit. There was no evidence of fuel washout nor was there any indiction of impending pin-to-pin failure propagation. This test supports an increase in DN signal for subsequent run-beyond-cladding-breach (RBCB) tests.

Research Organization:
Hanford Engineering Development Lab., Richland, WA (USA)
DOE Contract Number:
EY-76-C-14-2170
OSTI ID:
5489290
Report Number(s):
HEDL-TME-79-62
Country of Publication:
United States
Language:
English