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Knowledge Base for the Effect of Debris on Pressurized Water Reactor Emergency Core Cooling Sump Performance (NUREG/CR-6808)

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Publication Information

Manuscript Completed: February 2003
Date Published: February 2003


Prepared by
D.V. Rao, Principal Investigator

C.J. Shaffer,* D.V. Rao,
M.T. Leonard,** K.W. Ross***

Los Alamos National Laboratory
Los Alamos, NM 87545

Subcontractors:
*ARES Corporation
851 University Blvd. S.E., Suite 100
Albuquerque, NM 87106

**dycoda, LLC
70 Andres Sanchez Blvd.
Belen, NM 87002

***Innovative Technology Solutions Corporation
6000 Uptown Blvd. N.E., Suite 300
Albuquerque, NM 87110

B.P. Jain, NRC Project Manager

Prepared for
Division of Engineering Technology
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001
NRC Job Code Y6041

Availability Notice


Abstract

This report describes the substantial base of knowledge that has been amassed as a result of the research on boiling-water reactor (BWR) suction-strainer and pressurized-water reactor (PWR) sump-screen clogging issues. These issues deal with the potential insulation and other debris generated in the event of a postulated loss-of-coolant accident within the containment of a light-water reactor and subsequently transport to and accumulation on the recirculation sump screens. This debris accumulation could potentially challenge the plant’s capability to provide adequate long-term cooling water to the emergency core cooling system (ECCS) and the containment spray system pumps.

This report describes analytical and experimental approaches that have been used to assess the different aspects of sump and strainer blockage and to identify the strengths, limitations, important parameters and plant features, and appropriateness of the different approaches. The report is organized in the same order that an evaluation of the potential of sump screen blockage would be performed. The report provides background information on the issues, including significant United States regulatory developments regarding the resolution of the issue. The report is designed to serve as a reference for plant-specific analyses with regard to whether a sump or strainer would perform its function without preventing the operation of the ECCS pumps.



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