ML19319C681
| ML19319C681 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 02/13/1975 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19319C682 | List: |
| References | |
| NUDOCS 8002210542 | |
| Download: ML19319C681 (2) | |
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SACRAMENTO MUNICIPAL UTILITY DISTRICT C 1708 59th Street, Box 15830, Sacrarnento. California 95813:(916) 452 321 4
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February 13, 1975
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Director
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9 Re: Operating License DPR-54
, / a og Docket No. 50-312
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Abnormal Occurrence A0-50-312-75-1
Dear Sir:
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As defined by Proposed Amendment No. 30 to Technical' Specifications for the Rancho Seco Nuclear Fover Station, Section 6.9.1, and Regulatory J
Guide 1.16, Rev. 3, Section 2.b(2),.we are reporting the following Abnormal '
Occurrence as A0-75-1.
Y On. January 19, 1975, during routine surveillance testine. (SP-20s. 07 Y j
" solarion valve Surveillance" SFV-53610, the Reactor Building equalization.
i valve failed to close-from its. normal open position. An instrument techni-
-l cian'was informed immediately and he found'that the air line to the valvs'
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The line was drained of approximately one quart,of water and the technician blew the line dry for five minutes. The valve;was stroked six times after the repair and operated properly each time. When the problem was discovered, the redundant isolation valve-SFV-53609 was tested successfully.
An examination was conducted to increase the performance of the instrument air dryer system. The following corrective actions have been taken:
1)
The' instrument air dryer Silica Gel was replaced with 125 lbs.
desiccant on January 30, 1975.
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2)
The cycle time was set to the design specification of eight hours and the performance monitored.
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3)
The' desiccant drying temperature was increased to 155'F to optimize the purge flow drying cycle.
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Director-
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The purge flow rate was at 11 SCFM and was increased to d:
14 SCFM.
This is the first failure of a safety features valve due to water in the air line.
There was no transient associated with thid occurrence.
Respectfully, 4, fwN 4-
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J. J. Mattimoe Assistant General Manager J
and Chief Engineer i
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~ Enclosure
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R. H. Engelken, Region V 4
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