ML20202C004
| ML20202C004 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/02/1986 |
| From: | Reinaldo Rodriguez SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 86-06, 86-6, RJR-86-123, NUDOCS 8604110319 | |
| Download: ML20202C004 (2) | |
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SACRAMENTO MUNICIPAL UTILITY DISTRICT '. 6201 S Street, P.O. Box 15830. Sacramento CA 95852-1830.(916)452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA RJR 86-123 April 2, 1986 I
l J B MARTIN REGIONAL ADMINISTRATOR REGION V 0FFICE OF INSPECTION AND ENFORCEMENT ATTENTION DOCUMENT CONTROL DESK U S NUCLEAR REGULATORY COMMISSION WASHINGTON.DC 20555 DOCKET NO. 50-312 LICENSE NO DPR-54 SPECIAL REPORT NO. 86-06, DIESEL FIRE PUMP OUT-OF-SERVICE FOR MORE THAN 7 DAYS The Sacramento Municipal Utility District hereby submits Special Report No.
86-06 in accordance with Rancho Seco Nuclear Generating Station Technical Specifications, Section 3.14.2.2 and 6.9.5.E.
During cold shutdown conditions on March 3, 1986, the diesel engine driven fire pump failed to start while performing surveillance procedure SP 201.038.
The pump was declared inoperable and a work request was issued to investigate and correct the problem.
The investigation determined that rain water had entered the diesel engine through rusted areas in the muffler which extends above the building roof.
The diesel engine driven fire pump had failed to start due to water in the turbocharger and cylinders. The diesel engine was virtually completely overhauled including replacing the turbocharger, inspecting and reworking the head, inspecting and flushing the fuel injection system, replacement of some pistons, connecting rods and cylinder liners.
There was no evidence of any significant damage to the engine as a result of the water incursion.
The diesel engine driven fire pump was returned to service on March 14, 1986.
To ensure that the muffler is not permitted to degrade to the same extent in the future, an inspection of the muffler will be included in the 18 month diesel fire pump maintenance.
In addition, the exhaust systems of other equip-ment (e.g., diesel generators) will be inspected periodically. This inspection effort vill be implemented by June 1, 1986.
During the period that the diesel engine driven fire pump was out-of-service, it became apparent that the formal procedural requirement for the weekly inspection of the diesel engine driven fire pump battery had been permitted to lapse. A search of surveillance records indicate that the batteries were checked weekly (Technical Specification 4.18.2.1.i.1) although not formally k
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RANCHO SECO NUCLEAR GENERATING STATION O 14440 Twin Cities Road, Herald, CA 95638 9799;(209) 333 2935
Special Report 86-06 April 2, 1986 required by procedures. There was never a case during this period that the
. fire pump failed to start due to battery problems.
In addition, a thorough review of the technical specification surveillance requirements for fire protection has been initiated to ensure that formal procedural requirements exist for their completion. To date, no other cases of informal control have been identified. A review of the Technical Specification surveillance requirements is scheduled to be completed by April 15, 1986.
No fires were experienced during the period the fire pump was out-of-service, hcwever, the motor-driven fire pump was out-of-service for approximately 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> on March 10, 1986. This brief period of time when both fire pumps were out-of-service was the subject of Special Report 86-05 entitled, Loss of Fire Pumps dated March 24, 1986.
If you have any questions concerning this report, please contact Mr. Ron Colom the Rancho Seco Nuclear Generating Station Unit No. 1.
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R. J.
DRIGU ASSISTANT GENE L MANAGER, NUCLEAR i
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