ML20155G287

Special Rept 88-13:on 880908,fire Barrier Penetration Seals for Floor Slots H8FS86 & H8FS87 Not Returned to Operable Status within 7 Days,Per Tech Spec 3.14.6.2.Hourly Firewatch Posted & Penetration Seals Will Be Restored by 881021

ML20155G287
Person / Time
Site:	Rancho Seco
Issue date:	09/27/1988
From:	Keuter D SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
88-13, AGM-NPP-88-500, NUDOCS 8810140177
Download: ML20155G287 (2)

Text

g - -- .

• '*, ~ h,

') .3 gSMUD RE Fg'E U SACRAMENTO MUNICIPAL UTILITY DISTRICT C 6201 S Street, P.O. Box 15830MaGEOdsto CA 958521830 (916) 452 3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA September 27, 1988 13 SEP28 All : 2l AGH/NPP 88-500 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. DPR-54 SPECIAL REPORT NUMBER 88-13: FIRE BARRIERS BREACHED HORE THAN 7 DAYS

Dear Hr. Hartin:

Fire barrier penetration seals for floor slots H8FS86 and H8FS87 were discovered to be unqualified configurations and were not restored to operable status within the 7 days specified in the Rancho Seco Technical Specifications. The Sacramento Municipal Utility District hereby submits Special Report No. 88-13 in accordance with Rancho Seco Technical Specification 3.14.6.2.

Members of your staff with questions requiring additional information or clarification may coitact Mr. Kurt Zimmermann at (916) 452-3211, extension 4627.

Sincerely, Q

Dan R. Keuter Assistant General Manager Nuclear Power Production Attachment cc w/atch: A. D'Angelo NRC, Rancho Seco Document Control Desk, Washington CC N!k S

Srbth $$$$$[<t2 PDC E-RANCHO SECO NUCLEAR GENERATING ST ATION O 14440 To m Cit <s Rumi. McMd. C A 95G38 { 9799. (203) 333 2

1

". 's ,

, l 1

l SPECIAL REPORT NUMBER 88-13 l Fire Barriers Breached More Than 7 Days '

Date of Occurrence September 8, 1988 Plant Conditions at Time of Occurrence On July 29, 1988, Control Room personnel escalated power level from 65% to 80%. The plant was at approximately 80% power on September 8, 1988.

Identification of Occurrence Fire barrier penetration seals for floor slots H8FS86 and H8FS87 were not returned to operable status within 7 days as required in Technical Specification 3.14.6.2.

Descriotion of Occurrence On September 1, 1988, an evaluation completed by Nuclear Engineering disclosed that penetration seals for floor slots H8FS86 and H8FS87 were unqualified configurations in that insufficient data existed in design drawings to document the fire ratings of the penetration seals.

Corrective Action Talen An hourly firewatch was previously posted in the area and satisfied the Technical Specification 3.14.6 requirement for this deficiency.

The fire barrier penetration seals will be restored to operable status by October 21, 1988.

t l

l 1

--