ML20132D130

Responds to 850617 Verbal Request for Estimate of Mean Annual Population Dose from Feedwater Interruptions.Core Melt Caused by loss-of-feedwater Could Result in Conditional Mean person-rems of 12,000 W/Range of 3,000-20,000

ML20132D130
Person / Time
Site:	05000000, Davis Besse
Issue date:	06/18/1985
From:	Hulman L Office of Nuclear Reactor Regulation
To:	Minners W Office of Nuclear Reactor Regulation
Shared Package
ML20132B273	List: IR 05000346/1981003 IR 05000346/1983023 IR 05000346/1984015 IR 05000346/1984019 ML20132B438 ML20132B490 ML20132B672 ML20132B675 ML20132B682 ML20132B689 ML20132B716 ML20132B959 ML20132C258 ML20132C266 ML20132C280 ML20132C306 ML20132C416 ML20132C547 ML20132C695 ML20132C699 ML20132C797 ML20132C829 ML20132D113 ML20132D120 ML20132D126 ML20132D130 ML20133B744 ML20133B772 ML20133B778 ML20133B796 ML20133B804 ML20133B809 ML20133B820 ML20133B832 ML20133B847 ML20133B852 ML20133B856 ML20133B872 ML20133B878 ML20133B912 ML20133B923 ML20133B946 ML20133B990 ML20133B999 ML20133C023 ML20133C063 ML20133C076 ML20133C193 ML20133C209 ML20133C224 ... further results
References
NUDOCS 8506260705
Download: ML20132D130 (1)

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wAssmoTou. o. c. aosas JUN 181985 Docket No ': 50-346 rw MEMORANDUM FOR: Warren Minners, Chief Safety Program Evaluation Branch Division of Safety Technology FROM:

L. G. Hulman, Chief Accident Evaluation Branch Division of Systems Integration

SUBJECT:

POTENTIAL PERSON-REMS FROM A CORE MELT CAUSED BY LOSS-0F-FEEDWATER AT DAVIS-BASSE In response to your June 17 verbal request for an estimate of the mean annual population dose that might result from feedwater interruptions, we made a simple calculation of the conditional mean person-rems resulting from SST2 and SST3 releases at Davis-Besse. These were estimated to be 900,000 and 3,000, respectively, using data contained in NUREG/CR-2239. Discussions with J. Rosenthal of RSB indicate that for most potential accidents, releases more similar to SST3 would be expected, with releases more similar to SST2 occurring in no more than 1 or 2%. These conclusions confinn those indicated by H. Vander Molen of your staff. Consequently, we estimate the conditional mean person-rems of a loss-of-feedwater caused core-melt at Davis-Besse to be 12,000, with a likely range of 3,000 to 20,000.

man, M Accident Evaluation Branch Division of Systems Integration cc:

R. Bernero D. Muller F. Rowsome N

J. Rosenthal I

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