The contribution of fission product decay energy uncertainty to uncertainty in calculated reactor decay power Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/v405sd02t

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  • The uncertainty in decay energy for those fission products which contribute significantly to reactor shutdown power was evaluated. The methodology used assigned significantly larger uncertainties for data which were theoretically predicted than it did for experimentally determined data. The uncertainty was modeled as an increasing function of distance from beta stability for both theoretical and experimental data. The evaluated data were used in the ROPEY summation code to estimate the uncertainty in reactor decay heat due to the fission product decay energies. The uncertainty in reactor shutdown power after a 100-day irradiation was found to be about 8% immediately after shutdown. This uncertainty decreases to about 2% at shutdown times greater than 100 seconds. This is in substantial agreement with results of Schmittroth and Schenter. (⁵) The decay energy uncertainty for short cooling times is dominated by uncertainty in the theoretically predicted data.
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