ML19343B475

Part 21 Rept Re Svc Water Pump Speed Control.Only Momentary Contact Made from Load Sequencer Signal for Svc Water Pump Speed Switch to Go to High Speed on Loss of Offsite Power. Circuitry Redesigned

ML19343B475
Person / Time
Site:	Summer
Issue date:	12/11/1980
From:	Barker N EBASCO SERVICES, INC.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
REF-PT21-80-317-001 NUDOCS 8012240047
Download: ML19343B475 (3)

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G1EE;T ASSOCIATES. CC P 0 E:n 1453. Fea$ng. PA 15503/ie' 2'5-775-2533/ Cable Gitaso:/ Telex B35-431 60' *38.6 Decenber 11, 1980 United States Nuclear Regulatory Cornission Region I 631 Park Avenue King of Fr,:ssia, PA 19406 ATTE!!TIO::: Mr. Soyce H. Grier Director

SUBJECT:

Potential Reportable Event Service Water Pu=p Speed Switch Control

Dear Mr. Grier:

In accordance with 10CFRy requirenants, this is to document that Mr. S. D. Ebneter of Region I was netified by telephone on December 10,

.1980, at approxicately 8:15 a.m. , of a potential reportable event.

Iame of Individual Who Retorted Stephen J. Tor =a - Manager, Inspection & Material Services, who was acting for the Quality Assurance Division General Manager, made t: e call.

Activity Involved Gilbert Associates, Inc. (GAI) design of control circuitry for service water pu=p speed. switch.

Cocoonents Involved Not applicable.

Facihty Involved V. C. Su=er ::uclear Station, Unit 1, being constructed by the South Carolina Electric & Gas Cc=pany.

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US Nuclear Regulatory Coc=ission December 11, 198C Mr. 3. H. Grier Page 2 N. ?.. Earker Nature of Defect The signal from the load sequencer for the service water pu=p speed switch to go to high speed on loss of off-site power was a momentary contact. The speed switch operated, but then dropped back to low speed rhen the contact dropped out. This deficiency was discovered and documented during routine testing.

The safety hazard which could be created, is possible inadequate service water flow.

Date Information Obtained A written report indicating this tc be potentially reportable, was received by the Quality Assurante Division on December 4, 1980, from GAI Engineering.

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Corrective Action The circuitry has been redesigned to include a seal-in interlock. We have determined that this condition do'es not exist on any.of our other design pr:jects. No further action is planned.

If you require any further infor:ation en this matter, please contact me at (215) 775-2600, extension 2285.

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4,,. . N. R. EA KER

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Quality _ Assurance = Division 1

cc: H. Loren:

T. M. Decers

! V. Stello, Director, Office.of. Inspection _& Enforcement - 3 copies .

l Nuclear Regulatory Commission, Washington, . D.C. =20555 RCH:NRB:1sa i

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