ML20010F448

Forwards LER 81-014/01L-0.Detailed Event Analysis Encl

ML20010F448
Person / Time
Site:	Oconee
Issue date:	07/31/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010F449	List: ML20010F448 ML20010F451
References
NUDOCS 8109100219
Download: ML20010F448 (2)

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July 31, 1981

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Mr. James P. O'Reilly, Director ,-

U. S. Nuclear Regulatory Commission 2 7 Region II g-'  % 4 101 Marietta Street, Suite 3100 r-y g[ 1 -

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} .m 10198W S Re: Oconee Nuclear Station U 5 N*E'm )

Docket Nos. 50-269, -270, -287 s ,

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Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-269/81-14. This report is submitted pursuant to Oconee Nuclear Station Technical Specifi-cation 6.6.2.1.a(2). which concerns operation less conservative than the least conservative aspect of an LCO, and describes an incident which is considered to be of no significance with respect to its effect on the health and safety of the public. , ,

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Ver truly yours, O f S 'e g g A /s M

.h William O. Parker, Jr.

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DUKE POWER COMPANY OCONEE NUCLEAR STATION Report Number: '10-269/81-14 Report Date: July 31, 1981 Occurrence Date: July 17, 1981 Facility: Oconee Nuclear Station, Seneca, South Carolina Identification of Occurrence: A & B High Pressure Service Water Pumps Iroperable Conditions Prior to Occurrence: Oconee 1 - cold S/D Oconee 2 - 100% FP Oconee 3 - 100% FP Description of Occurrence: At 0300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br /> on July 17, 1981, it was discovered that the A & B High Pressure Service Water (HPSW) pumps had no control power indication and that the Elevated Water Storage Tank (EWST) showed 0 level. This prevented both automatic and manual start of the pumps should they be needed to maretain EWST level. This constitutes operation less conservative than the least conservative aspect of an LCO and is thus reportable pursuant to Technical Specification 6.6.2.1.a(2).

Apparent Cause of Occurrence: The problem with the control power for the A & B HPSW pumps was due to the Control Breaker Source A & B breakers located in cabinets B IT1 and B T2 13 being open. These breakers were left open when an isolation on the Unit 1 Startup Transformer CT1 was done at approximately 1106 on July 14, 1981- The problem with the EWST level indication was a blown fuse.

Analysis of Occurrence: During the time period that the A & B HPSW pumps were inoperable, the HPSW jockey pump maintained EWST level at greater than 90,000 gallons and HPSW pressure at approximately 125 pounds. Thus, the health and safety of the publi. were not affected by this incident.

Corrective Action: The immediate action of locating the open Control Power Source Breakers and reclosing them and the successful completion of the HPSW pump and power performance test corrected the loss of,the HPSW pumps. The blown fuse was replaced, thus returning the EWST to service. To prevent addi-tional losses of HPSW:

1) A change has been made to the shift turnover sheets to have a -

minimum of 2 HPSW pumps operable verified every shift.

2) A procedure is being written to cover removing from or returning to service 6900/4160/600 V breakers.

3) On shift training to instruct personnel on how to properly remove breakers from service and on the consequences of de-energizing unknown equipment.

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