ML20236K251

Special Rept 87-23:on 870910,util Identified That CO2 Zones 53 & 54 Not Restored to Svc within 14 Days.Caused by Opening Doors to Allow Nitrogen Dissipation Due to Plant Maint. Firewatches Established

ML20236K251
Person / Time
Site:	Rancho Seco
Issue date:	11/03/1987
From:	Firlit J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
87-23, AGM-NPP-87-338, NUDOCS 8711090163
Download: ML20236K251 (2)

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.u.l O^)SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT D P. O. Box 15830, Sacrameritq CA'95852183o, (916) 452-3211 AN ELECTRIC SYSTEM SEHMING ,THfhHEAR@qF[ CALIFORNIA AGM/NPP 87-338 NOV 0 31987 l

U. S. Nuclear Regulatory Commission Attn: J. B. Martin, Regional Administrator  !

Region V l Office of Inspection and Enforcement l 1450 Maria Lane, Suite 210 l Walnut Creek, CA 94596 DOCKET NO. 50-312

' RANCHO SECO !?JCLEAR GENERATING STATION LICENSE NO. OPR-54 SPECIAL REPORT NUMBER 87-23: ISOLATION OF CO2 ZONES 53 AND 54

Dear Mr. Martin:

CO2 Zones 53 and 54 were not res'Ared to service within 14 days as specified in the Rancho Seco Technical Specifications. The Sacramento Municipal Utility District hereby submits Special Report 87-23 describing the problem, corrective l action taken, and schedule for restoring the systems to operable status. This report is being submitted outside the time frame required in Technical Specification Section 3.14.1, 3.14.4 and 6.9.5.E. This delay is due in part to the incorporation of Zones 53 and 54 into the Technical Specifications in Amendment 85 (effective August 27, 1987). The District apologizes for any inconvenience this delay may have caused you. ,

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

Sincerely,

'M -

Joseph F. Firlit Assistant General Manager, l Nuclear Power Production l Attachment 1

cc: G. Kalman, NRC, Bethesda (w/atch)  !

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

F. J. Miraglia, NRR, Bethesda ( "

) g 8711090163 871103 i PDR ADDCK 05000312 S PDR, nANCHO SECO NUCLEAR GENERATING STATION i; 1444o Twin Cities Road, Herald, CA 95638-9799;(2o9) 333 2935-g

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SPECIAl. REPORT NUMBER 87-23 ISOLATION OF CO2 ZONES 53 AND 54 t ,.

Date of Report November'3,.1987 i

.Date of Occurrence September. 10, 1987

, Plant = Conditions Prior to Occurrence The plant has been in a major: outage with the reactor in cold shutdown.

Identification of Occurrence CO2 Zones 53.and 54 were' not restored to service within 14 days as specif.ied

'in Technical.' Specifications Sections 3.14.1 and 3.14.4.

-Dascriotion of Occu m Dra On March 7, 1987, the fire detection systems for Zones 53 and'54 were disabled.

n This rendered the CO2 systems in those zones inoperable. These systems were disabled because a plant preventive maintenance activity using nitrogen could

.potentially allow nitrogen to build up in those zones. The doors were propped open to allow for nitrogen dissipation from Zones 53 and 54. Hith the doors-open, a CO2 discharge could create a personnel safety hazard for nearby workers.

Corrective Action Taken-Firewatches were' established in accordance with Technical Specification requirements. The systems discussed above will be returned to service following cotopletion of the preventive maintenance activity scheduled for December 5, 1987.

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