Two days afetr a planned reactor shutdonw from 100% power, maintenance is to per

Question

Two days afetr a planned reactor shutdonw from 100% power, maintenance is to performed on one of two reactor primary heat exchangers, Each heat exchangers is rated at 12,000Btu/hr. To determine the current decay heat load, cooling is secured to both heat exchangers. The primary system heats up ar a rate of 1.8 degree F . The primary system contains 24,000 lb of coolant with a specific heat capacity of 0.8 Btu/lbm F. Will on heat exchanger be sufficient to remove the decay heat? Explain answer. Show all work

Explanation / Answer

decay heat = Q = mc dT/dt

here m for primary system = 24,000 lb

dT/dt = 1.8 degree F / hr

c = specific heat capacity = 0.8 Btu/lbm F

Q = 24000 * 1.8 x 0.8

Q = 34,560 Btu/hr

Each heat exchangers is rated at 12,000Btu/hr

hre Q = 34,560 Btu/hr

so one heat exchanger will not be sufficient

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