A simplification of existing methods of calculating decay heat following reactor shut-down and an investigation of the effects of power history upon decay heat Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gf06g602d

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  • A method of calculating decay heat is presented which is a simplification of existing calculational methods, the summation method in particular. The method involves the assumption that one physical process, neutron capture, is negligible in order to simplify the governing physical equations. A Greens function is derived and the decay heat is defined by quadrature of this function with power over time. A discussion of the size of the error induced by the assumption that neutron capture is negligible is presented. The results show good agreement with the summation method and indicate that the capture process accounts for less than 1% of the total decay heat. A discussion of power history effects upon decay heat is presented. The importance of various irradiation intervals is ascertained. The importance of power intervals close to shutdown is recognized. From this work a graphical method of calculating decay heat is described as an aid to understanding the importance played by various irradiation intervals.
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