ML20236P891
| 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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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.
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- 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 opening and closing. Please justify or correct this apparent discrepancy.
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- 3. Has water hammer due to valve closure been considered in the determination -
of pressure differentials? If not, please explain. .
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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
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