An Experimental Determination of Fission Product Heating After Shutdown of the Low Intensity Training Reactor

Abstract

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Fuel Plate Surface Temperature in a Fully-Uncovered Fuel Assembly after a Loss-of-Coolant Accident in an MTR-Type Research Reactor

“…The sequence of operations for a typical test is that approximately 5 minutes prior to the end of the steady operating time, the cooling water pumps were stopped and the inlet and outlet valves were closed to prevent water leakage back into the reactor [8]. A manhole cover at the tank top was opened to allow air to enter the tank when the water drains out.…”

“…for an out-core ORR fuel assembly (8) The right hand side of Eq. (8) is the decay power minus the heat loss rate for the fuel assembly.…”

Fuel Plate Surface Temperature in a Fully-Uncovered Fuel Assembly After a Loss-of-Coolant Accident in the Hoger Onderwijs Reactor (HOR)

“…for an in-core LITR fuel assembly (9) The reduction in the value of the factor indicates that the heat transfer is poorer for an in-core fuel assembly than that for a fuel assembly hanging out-core in stagnant atmosphere. It is noted that when the fuel assembly is on the grid plate, there is heat loss by conduction to the grid plate and other reactor structure, and this heat loss mode is not available for a hanging fuel assembly.…”

“…The sequence of operations for a typical test is that approximately 5 minutes prior to the end of the steady operating time, the cooling water pumps were stopped and the inlet and outlet valves were closed to prevent water leakage back into the reactor [9]. A manhole cover at the tank top was opened to allow air to enter the tank when the water drains out.…”

“…Although the factor C was determined semi-empirically for a particular reactor (i.e., the ORR or the LITR), Eq. (8) or (9) has been used to analyze LOCA in some other similar reactors having minor design differences, by adjusting the factor C in a reasonable way to account for the design differences. For example, Eq.…”