# A curve fit to the rate of the decay heat data of a typical PWR fuel cycle resulted in the following

A curve fit to the rate of the decay heat data of a typical
PWR fuel cycle resulted in the following equation:

where tQ )(is the decay power at time t, Qnominal  is
the nominal reactor power, and t is the time after reactor shutdown.
Coefficients A and Bi are: A = 0.3826033E-2, B1 =
276.6013, B2 = -5,124,569, B3 = 0.6344872E11, B4
= – 0.4427653E15, B5 = 0.1551979E19, and B6 =
-0.2086165E22. Evaluate the acuuracy of the formula given in Problem 55 by
plotting both equations and comparing the results.

Problem 55

A reactor that has been operating at nominal power level of
2700 MWth
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A curve fit to the rate of the decay heat data of a typical
PWR fuel cycle resulted in the following equation:

where tQ )(is the decay power at time t, Qnominal  is
the nominal reactor power, and t is the time after reactor shutdown.
Coefficients A and Bi are: A = 0.3826033E-2, B1 =
276.6013, B2 = -5,124,569, B3 = 0.6344872E11, B4
= – 0.4427653E15, B5 = 0.1551979E19, and B6 =
-0.2086165E22. Evaluate the acuuracy of the formula given in Problem 55 by
plotting both equations and comparing the results.

Problem 55

A reactor that has been operating at nominal power level of
2700 MWth for 2 years is shut down. The decay power from this reactor, for any
time after shutdown, can be fairly well estimated from:

where t in this formula is the time after reactor shutdown
in seconds. Find a) the power obtained from the reactor 1 day after shutdown,
and b) the amount of energy produced by the decay power in a period of 24
hours.

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