ML19317F826
| ML19317F826 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/03/1977 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML19317F827 | List: |
| References | |
| NUDOCS 8002210577 | |
| Download: ML19317F826 (2) | |
Text
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% SNUD IE FILE COPY SACRAMENTO MUNICIPAL UTILITY DISTRICT C 6201 S Street. Box 15830. Sacramento. Califomia 95813; (916) 452-3211 September 29, 1977 1
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r" Director of Regulatory Operations qc ;g
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Mr. R. H. Engelken
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1990 N. California Boulevard
.C NRC Operations Office, Region V
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Walnut Creek, California 94596 J
c' Re: Operating License DPR-54 Docket No.'50-312 Reportable Occurrence 77-10 d
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Dear Mr. Engelken:
'V In accordance with Technical Specifications for Rancho Seco Nuclear Generating Station,' Section 6.9.1, and Regulatory Guide 1.16, Revision 4 Section C.2.b.2, the Sacramento Municipal Utility District is hereby reporting
,J C 'N the following as RO 77-10.
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The first refueling shutdown for Rancho Seco began August 20, 1977.
In accordance with Technical Specif teations, Section 4.14.4, functional testing of a representative sample of safety system hydraulic snubbers was initiated on August 29.
As specified in the refueling interval surveillance procedure (SP 201.10B), the engineer in charge of the testing selected ten snubbers to be included in the program. The first two snubbers tested failed to meet the lockup velocity criteria. Technical Specifications require that an additional ten percent of the 81 snubbers subject to functional testing be tested for each snubber found which fails to meet the acceptance criteria. At this point menage-ment decided to inspect all remaining snubbers rather than the additional twenty percent required. Upon corplation of this expanded program, the data was evaluated andit was determined that 35 snubbers should be rebuilt or adjusted.
Upon completion of the testing, the acceptable snubbers were reinstalled and a program was initiated to determine the cause of the failures and to return J,--
the snubbers to operable status. The complete results of this program are not available at this time. The details (including manufacturer, failure mode, cause J
of failure, and repairs made) will be submitted in a followup report by October 5, 1977.
There was no plant transient associated with this occurrence.
Respectfully submitted,
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J. J. Mattimoe
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Assistant General Manager p
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