ML20043H866
| ML20043H866 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 06/12/1990 |
| From: | Keuter D SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 90-10, AGM-NUC-90-165, NUDOCS 9006260532 | |
| Download: ML20043H866 (3) | |
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(suun TC SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 S Street, P.O. Box 15830 Sacramento cA D68521830, (916) 452 3211.
AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA -
eg J3W A i U AGM/NUC 90-165
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June 12,,1990 U. S. Nuclear. Regulatory Commission Attn:
J. B. Martin, Regional Administrator Region V 1450 Maria Lane, Suite 210 Halnut Creek, CA 94596 Docket No. 50-312 Rancho.Seco Nuclear Generating Station License No. OPR-54 SPECIAL REPORT-90-10:
FIRE BARRIERS BREACHED MORE THAN 7 DAYS
Dear Mr. Martin:
In accordance with Technical Specification 3.14.6.2, the District hereby submits Special Report 90-10. This special report discusses fire barriers in the Auxiliary Building and Turbine Building which became inoperable and were not returned to service within 7 days as-required by Technical Specification-3.14.6.2.
Members of your staff with questions requiring additional information or-clarification may contact Ed Bennett at.(209) 333-2935,- extension'4648.
t Sincerely, Q
DO~
Dan R. Keuter i
Assistant General-Manager 1
Nuclear cc w/atch:
C. Myers, NRC, Rancho Seco Document Control Desk, Hashington DC 9006260D32 900612 PDR ADOCK 05000312 S
PDC lb \\
f RANCHO SECO NUCLEAR GENERATING STATION D 1444o Twin Cities Road,. Herald, CA 95638-9799;(209) 333 2935
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SPECIAL REPORT NUMBER 90-10'..
' Fire Barriers Breached More Than 7 Days Date of Occurrence See Table 1.
Plant Conditions at the Time of Occurrence The plant has been shutdown since June 7, 1989, and-is in a defueled' condition.
Identification of the Occurrence LThe fire barriers in the Auxiliary Building and Turbine Building listed in Table I were not-restored to operable status within 7 days as required by.
Rancho Seco Technical Specification 3.14.6.2..
TABLE 1 Firt Barriers tii the Auxiliary Building and Turbine Building that failed SP.0719 or SP.720 Date Returned to Dr.te of Penetration Operable Mcuttenct Q0at Failed S_tAlui 05/15/90 AU208 05/08/90 5/23/90 05/15/90 AU218 05/08/90 5/24/90 05/16/90 AU214 05/09/90 5/24/90
.i 05/16/90 AU211 05/09/90 5/23/90 05/16/90 AU212 05/09/90 5/23/90-05/16/90 AU227 05/09/90 5/24/90 05/17/90 AU328 05/10/90 5/29/90.
05/18/90
'AU120 05/11/90
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05/18/90 AU119 05/11/90 5/31/90 05/18/90 AU l l '.
05/11/90 5/31/90 05/21/90 AU113 05/14/90 05/21/90 AU135 05/14/90 5/31/90-05/21/90 AU103 05/14/90 05/21/90 AU125 05/14/90 05/21/90 AU131
-05/14/90 05/22/90 AU129 05/15/90-05/22/90 AU130 05/15/90 05/22/90 AU132 05/15/90 l
1
- . ' s s *PECIAL REPORT NUMBER 90-10 S
Fire _ Barriers Breached More Than 7 Days (Continued)
Description of the Occurrence The doors listed in Table I failed surveillance tests SP.0719 " Refueling Interval Fire Barrier Surveillance Procedure (Fire Door Assemblies - Auxiliary Building Mezzanine and Turbine Deck Levels)" or SP.720 " Refueling Interval Fire Barrier Surveillance Procedure (Fire Door Assemblies - A4xiliary Building Grade Level)" due to normal degradation.
Corrective Actions Taken Operability of fire detectors was verified on at least one side of the breached barriers and hourly fire watches were established in accordance with Technical Specification 3.14.6.2.
Ten doors have been. returned to operable status as noted in Table-1, 4
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