ML20070D346

Special Rept 91-003:on 910127,smoke Detectors Found Covered W/Plastic Bags in Panel 1H13P733,rendering Detectors Inoperable.Plastic Bags Removed & Surveillance Resumed

ML20070D346
Person / Time
Site:	Grand Gulf
Issue date:	02/25/1991
From:	Cottle W ENTERGY OPERATIONS, INC.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
91-003, 91-3, GNRO-91-00033, GNRO-91-33, NUDOCS 9102280212
Download: ML20070D346 (2)

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GGNS Tech Spec 3.3.7.9 gyuo-u==.

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February 25, 1991 U.S. Nuclear Regulatory Commission Mail Station P1-137 Washington, D.C. 20555 .

Attention: Document Control Desk Gentlemen:

Subject:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 Special Report 91-003 >

Insufficient Operable Combustion Detectors In Control Room Panel GNR0-91/00033 On January 27, 1991 while station instrumentation and control technicians were performing surveillance of control room fire detection instrumentation in accordance with Technical Specifications 4.3.7.9.1 and

-4.3.7.9.2, two combustion (i.e., smoke) detectors were found covered with plastic bags in panel 1H13P733. This condition impaired-the performance of these two detectors and rendered them inoperable. These detectors

• provide only early warning capability. This condition did not hinder the performance of the halon fire protection system.

-Investigation _of_the event could not-determine the specific work activity _

which: installed the bags.. The detectors were last known to be operable-on  ;

. August _3,-_1990 when the previous semi-annual _ surveillance had_been _

performed for halon panel 1H13P933. This event is reperh ble pursuant to Technical Specification 3.3.7.9 action b since the mir. % quantity of detection instruments was not satisfied and exceeded the fourteen day time limit.

O ce n ! Q 9102290212 910225 PDR 6-ADOCK 05000416 PDR- - f-SR91003/SCMPFLR ---I k

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, , February 25, 1991 GNR0-91/00033 Page 2 of 3 The installation of these plastic bags violated the controls set foith in existing station procedures. The plastic bags were removed from the detectors upon notifying the Operations Snift Supervisor. Inspection of other panels found no additional detectors covered. The detector surveillance was resumed and performed satisfactorily. These detectors were declared operable on January 27, 1991. Fire watch requirements were satisfied since the control room had been continuously occupied during this period.

Yours truly, i c or N WTC/cg cc: Mr. D. C. Hintz Mr. R. B. McGehee i Mr. N. S. Reynolds Mr. H. L. Thomas Mr. J. L. Mathis Mr. Stewart D. Ebneter Regional Administrator U.S. Nuclear Regulatory Commission Region 11 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30323 Mr. L. L. Kintner, Project Manager Of fice of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 11021 Washington, D.C. 20555 SR91003/SCMPFLR - 2

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