NSD-NRC-97-5196, Forwards WCAP-14800, AP600 PRA Thermal/Hydraulic Uncertainty Evaluation for Passive Sys Reliability. Rept Contains Both short-term Cooling & long-term Recirculation Cooling PRA T/H Uncertainty Evaluation
| ML20141C930 | |
| Person / Time | |
|---|---|
| Site: | 05200003 |
| Issue date: | 06/19/1997 |
| From: | Mcintyre B WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | Quay T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20141C931 | List: |
| References | |
| NSD-NRC-97-5196, NUDOCS 9706260095 | |
| Download: ML20141C930 (3) | |
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A...oghouse Energy Systems Ba 355 Electric Corporation Pittsburgh PennsyIvania 15230-0355 NSD-NRC-97-5196 DCP/NRC0924 Docket No.: STN-52-003 June 19,1997 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION: T.R. QUAY
SUBJECT:
WCAP-14800, AP600 PRA TilERMAL/IlYDRAULIC UNCERTAINTY EVALUATION FOR PASSIVE SYSTEM BELIABILITY, KEY ISSUE 21
Dear Mr. Quay:
J Enclosed please find the Westinghouse topical report WCAP-14800, "AP600 PRA Thermal /llydraulic Uncertainty Evaluation for Passive System Reliability." This report contains both the short-term cooling and long-term recirculation cooling PRA T/fl uncertainty evaluation.
A draft of the PRA expanded event trees used for the T/11 uncertainty evaluation and the short-term cooling success path categorization was sent to the NRC on January 2,1997 (Westinghouse letter DCP/NRC0695). The structure of Sections 1 through 5 remains the same as the draft report.
Ilowever, the integration of the long-term cooling work scope into this report required the re-structuring of subsequent sections. The information contained in Sections 6,7, and 8 of the draft report is re-structured within Section 6 of WCAP-14800. Enhancements have been made to Sections 1 I
through 6 of this report to address RAls and provide additional clarification of the categorization of f
j the success paths. Sections 7 through 12 of this report contain new material, including: categorization p
of success paths to define cases for long-term cooling, comparison of short-term cooling and long-term
+()4 1 cooling case definitions, results of conservative T/II a talyses for short-term and Cong-term cooling, and a discussion of the PRA effect due to the T/fl analysis results.
Submittal of this topical report addresses Key issue 21. The NRC technical staff should review the enclosed material.
Submittal of WCAP-14800 closes, from the Westinghouse perspective, DSER open item 19.1.3.1-3 (OITS #1400), and the Westinghouse status column in the OITS will be changed to " Action N." Tne NRC should inform Westinghouse of the status to be designated in the "NRC Status" column of the OITS.
9706260090 970619
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DCP/NRC0924 June 19,1997 Please contact Cynthia L. Haag on (412) 374-4277 if you have any questions concerning this transmittal.
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Brian.A. McIntyre, Manager Advanced Plant Safety and Licensing jml Enclosures cc:
W. Iluffman, NRC (2 copies Enclosure)
A. Levin, NRC (Enclosure)
J. Flack, NRC (Enclosure)
G. Holahan, NRC (w/o Enclosure)
N. J. Liparulo, Westinghouse (w/o Enclosure) l 3263A wpf r
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Enclosure to Westinghouse Letter DCP/NRC0924 June 19,1997 1
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