ML20149D885

Special Rept:On 871207,listed Fire Penetrations Determined to Be Nonfunctional for Greater than 7 Days.Caused by Normal Aging of Sealing Matl & Inadequate Restoration of Seals. Penetrations Repaired

ML20149D885
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	01/06/1988
From:	Olmstead C PORTLAND GENERAL ELECTRIC CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
CAO-005-88, CAO-5-88, NUDOCS 8801130158
Download: ML20149D885 (2)

Text

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mum ame me

.h' Portland General Electric Company Trojan Nudear Plant 71760 Columbia River liwy January 6, '.988 Rainier, Oregon 97048 CAO-005-88 (503) 55 6 3713 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555 Gentlemen Special Report Limiting Condition for Operation 3.7.9 of the Trojan Technical Specifications requires the submittal of a Special Report if a 3-hour fire barrier is nonfunctional for greater than seven days.

During the week of December 7, 1987, the following penetrations were determined to be nonfunctional for greater than 7 days.

Penetration Location Room 3039-A Turbine Building-45'el. Hallway 3037-A TB-45' Hallway 3054-A TB-45' Hallway 259-B TB-45' Hallway 480-B TB-63' Electrical Switchgear 371-A TB-63' Electrical Switchgear 3056-A TB-45' Remote Shutdown Panel The listed penetrations were determined to be inoperable during the 18-month inspection of fire penetrations, wl.ich is currently ongoing. The penetrations were assumed to be inoperable for greater than 7 days since it could not be proved they were inoperable for less than 7 days. These failures represent a failure incidence of about 0.5%. About 1525 of 3400 penetrations have been inspected and it is expected that a similar incidence will be experience in the remaining penetrations to be inspected over the next 60 days.

The cause for the failures is normal aging of the sealing material and inadequate restoration of the seals following cable installa-tion. The compensatory measures of Technical Specification 3.7.9 l (checking local smoke detectors and establishing an hourly fire j i

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l 8801130158 880106 iP6*1o i l PDR ADOCK 05000344 i S DC Dj}(,

U.S. Nuclear Regulatory Commission 8

CAO-005-88 Page Two i

patrol) were established as required. All of the penetrations have been repaired. Corrective action to preclude future failures due to these causes is being considered and will be implemented based upon the results of the remaining inspections.

Sincerely.

. O,h ,0 .

C. A. Olmstead General Manager CAO/h S/DWS/ Kisg c: Mr. Dave Yaden, Director Mr. R. C. Barr State of Oregon USNRC Resident Inspector Department of Energy Trojan Nuclear Plant Mr. John B. Martin Distribution Regional Administrator US Nuclear Regulatory Commission