Evaluation of Treatment of Effects of Debris in Coolant on ECCS and CSS Performance in Pressurized Water Reactors and Boiling Water Reactors (NUREG/CR-7011)

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Publication Information

Manuscript Completed: April 2010
Date Published: May 2010

Prepared by:
J.M. Cuta, B.E. Wells, C.H. Delegard and B.F. Saffell

Pacific Norhwest National Laboratory
902 Battelle Boulevard
Richland, WA 99352

J. Burke, NRC Project Manager

NRC Job Code N6636

Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington DC 20555-0001

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This report identifies significant differences in the industry and regulatory guidance for the treatment of suction strainer performance in pressurized water reactors (PWRs) compared to that in boiling water reactors (BWRs) during operation of their respective emergency core cooling systems, containment spray systems, and residual heat-removal systems in postulated loss-of-coolant-accident events. These differences are evaluated for their technical significance, conservatism, and consistency. Recommendations are provided for appropriate guidance on technical requirements to address the issues in a consistent and conservative (or prototypic) manner for both reactor types.

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