ML20236P891

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Requests for Addl Info Re Review of Responses to Action Item E of IE Bulletin 85-003
ML20236P891
Person / Time
Site: Rancho Seco
Issue date: 11/16/1987
From:
NRC
To:
Shared Package
ML20236P880 List:
References
FOIA-87-758 IEB-85-003, IEB-85-3, NUDOCS 8711190056
Download: ML20236P891 (1)


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1 REQUEST FOR ADDITIONAL INFORMATION (RAI) RE:

Review of Responses to Action Item e-of IE Rulletin 85-03 Licensee:

Unit (s): Rancho Seco'1 I

Sacramento Municipal Utility Date of-' Response: 05-16-86' District 05-86 6201 S Street 11-05-86 P. O. Box 15830 Respondent:

Sacramento, CA 95813 J..E. Ward.

l Assistant General Manager, Nuclear The information provided in your response to Action Item e of IE Bu11etin 85.03 was found to be deficient in some. areas. Please provide the additional infor--

i mation necessary to resolve. the following comments and questions:

1.

Unidentified MOVs in discharge ifnes of the core flooding tank _ safety-injection system are shown normally open on FSAR figures 6.1-1 and 6.' 2-1, both Amendment 2.

The possible problem that the system would be inoperable if the MOVs were left closed inadvertently should be addressed. Based'on l

the assumption of inadvertent equipment operations as required by. Action Item a of the bulletin, revise Table 1 of the response of May 16,'1986 to 1

include these two valves.

a 2.

Differential pressures for AFW discharge MOVs 20577 and 20578 and cross-connect MOVs 31826 and 31827 have been compared with those listed for equivalent valves at two other B&W plants. This comparison. indicates i

that the delta-Ps for Rancho Seco 1 should be~ about l.38 times greater for i

opening and closing.

Please justify or correct this apparent discrepancy.

3.

Has water hammer due to valve closure been considered in the determination -

of pressure differentials? If not, please explain..

s 4

According to the response of 11-05-86, the method proposed for. setting switches involves counting handwheel turns. This method is not recom-mended, because of one of the problems at Davis-Besse 1 reported in IER 85-03. Please provide a description of.how the problems at Davis-Besse 1 caused.by counting handwheel turns will be' compensated for at your facility.

8711190056 871116 PDR FOIA GR ABER B7-758 PDR A \\

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