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Release Fractions in Non-LOCA Accidents in Draft Regulatory Guide 1.183, DG-1199

Andrews, Nathan C.; Gauntt, Randall O.

In this note, an argument is made that the non-loss of coolant accident (LOCA) fractions of fission product inventory found within the gap is too high for alkali metals as currently specified within Regulatory Position 3.2 of Draft Regulatory Guide 1.183 rev.1 (DG-1199). This assertion extends to the enthalpy-dependent transient fission product release component used in reactivity initiated accidents. Regulatory Position 3.2 of Draft Regulatory Guide 1.183 rev. 1, which is presented below, details the release fractions of fission product inventory for postulated accident scenarios including both LOCAs and non-LOCA accidents. Relevant non-LOCA accidents include fuel handling accidents, boiling water reactor (BWR) rod drop accidents, pressurized water reactor (PWR) rod ejection accidents, BWR/PWR main steam line breaks, PWR steam generator tube ruptures and PWR locked rotor accidents.