ML20248L335
| ML20248L335 | |
| Person / Time | |
|---|---|
| Site: | 05200003 |
| Issue date: | 05/01/1998 |
| From: | Mcintyre B WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | Black S NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-QA-99900404 99900404-97-02, 99900404-97-2, NSD-NC-98-5679, NUDOCS 9806110093 | |
| Download: ML20248L335 (2) | |
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Box 355 Westinghouse Pittsburgh Pennsylvania 152300355 Electric Company NSD-NC-98-5679 DCP/NRC 1354 Docket No.: 52-003 May 1,1998 Document Control Desk U. S. Nuclear Regulatory Commission 3
Washington, D C 20555 Attentioni Suzanne C. Black 4
,1
Subject:
Response to NRC Inspection No. 99900404/97-02 of AP600
Reference:
- 1. Letter, S. C. Black to N. J. Liparulo, " Request for Additional Information, NRC Inspection No.
9990N04/97-02", dated April 28.1998
- 2. Letter, B. A. McIntyre to S. C. Black. " Response to NRC Inspection No. 999004N/97-0T dated April 17,1998 t
Reference I requested that Westinghouse provide additiccal information to support the closure of a nonconformance and the unresolved issue associated with the subject inspecdon. The additional information is in two areas, resolution of Design Assurance Review (DAR) items relative to Unresolved Item 9990N(M/97-02-03, and the contents of SSAR Chapter 3 related to the Nonconformance 99900404/97-02-01.
A conference call was held between Westinghouse and the NRC staff on April 30,1998, to discuss the DAR action plan.
NRC identified a concern noted by the DAR team that was not addressed in the Reference 2 transmittal. This was determined to be limited to a specific calculation providing containment input and is addressed in the attachment to this letter. No other cases were identified where closure needed additional documentation.
The material addressing the SSAR Chapter 3 issues in Reference 2. responds questions concerning five examples of SSAR changes.. All of these items were resolved with Revision 22 of the SSAR. The criteria used for the design of the nuclear l
island structures are consistent with those committed to in the SSAR.
1 Please contact me on 412-374-4334 or Bob Tupper on 412-374-5219 if you have any questions concerning this transmittal.
- A Bnan A. McIntyre, Manager Advanced Plant Safety and Licensing
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Attachment cc: T, R. Quay, NRC/NRR/DRPM (w/ Enclosures)
R. L. Pettis. NRC/NRR/PSIB/ DISP (w/ Enclosures)
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l R. A. Gramm. NRC/NRPJDRCH/HQMB (w/ Enclosures)
N. J. Liparuto, Westinghouse (w/o Enclosures)
J. J. Bastin, Westinghouse (w/o Enclosures)(Rockville Office) f' i
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9906110093 990501 l
pop eA999 EMVWEST 99900404 PDR (g-l W - I t
J Attachment to Westinghouse Letter DCP/NRC-1354 May 1,1998 Additional information on Resolution of Item 8 l
J A revised calculation was issued to address comments identified in the AP600 Design Assurance Review.
The containment geometry calculation determines the heat sink getities, compartment volumes, and flow areas for the containment building and region between the containment vessel and inside face of the shield building. The results of this calculation were determined to be appropriate and were used by Westinghouse as input to the WGOTHIC computer code to analyze the impact of LOCA and main steam line break on the integrity of the containment vessel and the behavior or the passive containment cooling system. A caution was added to alert other groups performing analyses of the AP600 containment building that users of the results of this calculation should assure the applicability of these inputs to their analyses.
The methodology used to calculate the average of thickness of metal heat sinks yields conservative results, and underestimates the amount metal heat sinks by a factor of two in some cases. In this and future revisions of the calculation, this general methodology will not be used; instead, a more detailed case by case approach will be used to calculate the average thickness of metal heat sinks, in the current revision, the average thickness calculation for gratings, support steels beams, columns, and selected metal heat sinks are studied to evaluate the conservatism.
Additional details concerning the bases for the calculations were added to the discussion in the calculation note.
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