ML20151F931

Special Rept 88-03:on 880225,Tech Spec 3.14.4 Violated. Caused by Fire Suppression CO2 Sys Not Being Restored to Operable Status within 14 Days.Fire Watch posted.CO2 Sys Will Remain Inoperable Until Redesign of Fire Damper Logic

ML20151F931
Person / Time
Site:	Rancho Seco
Issue date:	03/25/1988
From:	Firlit J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
88-03, 88-3, AGM-NPP-88-120, NUDOCS 8804190068
Download: ML20151F931 (3)

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R E Ep/g SACRAMENTO MUNICIPAL UTluTY DISTRICT O 6201 S Street, P.o. Box 15830, Sacramento CA 5852 1830.(916) 452 3211

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AN ELECTRIC SYSTEM SERVING THE HEART OF CAllrORNIA AGH/NPP 88-120 IEJ f.'$ 1; p j,.3 g MAR 2 51988 U. S. Nuclear Regulatory Commission Attn: J. B. Hartin, Regional Administrator Region V 1450 Haria Lane, Suite 210 ,

Halnut Creek, CA 94596 Docket No. 50-312 Rancho Seco Nuclear Generating Station License No. DPR-54 SPECIAL REPORT NUMBER 88-03: REMOVAL OF FIRE SUPPRESSI0ri CO2 SYSTEM FROM ZONES 75, 76, 77, 78, 79, AND 80

Dear Hr. Hartin:

The Fire Suppression CO2 system for the NSEB Switchgear Rooms A and B, NSEB Electrical Equipment A and B, and NSEB Battery Rooms GA and GB was not restored to operable status within the 14 days specified in the Rancho Seco Technical Specifications. In accordance with Technical Specifications 3.14.4.2 and 6.9.5.E, the Sacramento Municipal Utility District hereby submits Special Report 88-03 describing the problem and corrective actions taken.

Please contact me if you have any questions. Members of your staff with questions requiring additional information or clarification may contact Mr. Kurt Zimmermann at (916) 452-3211, extension 4627.

Sincerely, 9,b b

/oseph J F. Firlit Assistant Gen 6ral Manager, Nuclear Power Production Attachment cc: G. Kalman, NRC, Rockville (w/atch)

A. D'Angelo, NRC, Rancho Seco ( )

F. J. Miraglia, NRR, Rockville ( "

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RANCHO SECO NUCLEAR GENERATING STATloN O 1444o Twin Cities Road, Herald, CA 95638 9799;(209) 333-2935

SPECIAL REPORT NUMBER 88-03 Removal of Fire Suppression CO2 System From Zones 75, 76, 77, 78, 79, and 80 Date of Occurrence February 25, 1988 Plant Conditions Prior to Occurrence The plant has been in a major outage with the reactor in cold shutdown.

Identification of Occurrence The following fire suppression CO2 systems were not restored to operable status within 14 days as specified in Technical Specifications Section 3.14.4.

ZONE ROOM 75 NSEB Switchgear Room B 76 NSEB Switchgear Room A 77 NSEB B Electrical Equipment 78 NSEB A Electrical Equipment 79 NSEB Battery GB 80 NSEB Battery GA Description of Occurrence At 2100 hours0.0243 days <br />0.583 hours <br />0.00347 weeks <br />7.9905e-4 months <br /> on February 11, 1985, the CO2 system for the above zones was removed from service to perform work that will bring the NSEB HVAC system and NSEB fire suppression systems into compliance with the requirements of 10 CFR 50 Appendix R, Section III.G.

Corrective Action Taken A fire watch was posted for each inoperable CO2 system listed above in accordance with Technical Specification 3.14.4.2. The CO2 systems were i removed from service in the referenced zones as a progression of design change  !

modifications to bring the NSEB HVAC system in compliance with 10 CFR 50 j Appendix R,Section III.G.

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SPECIAL REPORT NUMBER 88-03 (Contir.ued)

The CO2 systems for Zones 75 through 80 were removed from service as part of current design change ECN R-1078, Revision 1. ECN R-1078 modifies the mechanism for closure of HVAC system dampers used for containment of carbon dioxide fire suppression system discharge within the noted zones. l The C02 systems will remain inoperable with compensatory measures in place until the C02 systems are returned to service by re-design of the fire damper closure logic in a future design change. J

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