- Author
-
Baxter, J. T.
- Title
- N Reactor External Events Probabilistic Risk Assessment.
- Coporate
- Westinghouse Hanford Co., Richland, WA
- Report
-
WHC-SA-0753
October 1989
10 p.
- Distribution
- Available from National Technical Information Service
- Book or Conf
- U.S. Department of Energy. Natural Phenomena Hazards Mitigation Conference, 2nd. October 3-5, 1989,
Knoxville, TN,
1989
- Keywords
-
risk assessment
|
nuclear reactors
|
water
|
hazard assessment
|
fire damage
- Abstract
- An external events probabilistic risk assessment of the N Reactor has been completed. The methods used are those currently being proposed for external events analysis in NUREG-1150. Results are presented for the external hazards that survived preliminary screening. They are earthquake, fire, and external flood. Core damage frequencies for these hazards are shown to be comparable to those for commercial pressurized water reactors. Dominant fire sequences are described and related to 10 CFR 50, Appendix R design requirements. Potential remedial measures that reduce fire core damage risk are described including modifications to fire protection systems, procedure changes, and addition of new administrative controls. Dominant seismic sequences are described. The effect of non-safety support system dependencies on seismic risk is presented.