ML20037B790
| ML20037B790 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 12/04/1980 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 80-030-81P, 80-30-81P, NUDOCS 8012040419 | |
| Download: ML20037B790 (2) | |
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l PHII.ADE!.PHIA ELECTRIC COMPANY gd[/
Peach Bottou Atomic Power Station Delta. Wennsylvania 17314 Mr. Bovce H. Grier Office of Inspection and Enforcement Region 1 untted States Nuclear Regulatory Commission 631 Park Avenue l
King of Prussia, PA 19406 i
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SUBJECT:
REPORTABLE OCCURRENCE - PRG@T MDrtFICATION 4.,
b Confirming R. 5. Fleischmann's conversation with Mr. Cowgill an November 24, 1980.
Reference:
Docket No. 50-277
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Peach Botton Unit 2
-j Tec~enical Specification
Reference:
3.7.A.2 j
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Report No. 2-CO-30/IP
-l Occurrence Date: November 24, 1980 Identification of_ Occurrence-
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~P With the unit operating at 37% power, annameistor " Torus Vent Valves Open" alarmed, alerting the aperator to a possible loss of primary caetainment
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isolation capability.
Investiaation showed that a needle valve in the air supply to the boot seal of the inmer isolation valve AD-2511 was closed.
and its boot seal is believed to have been deflated.
n e outboard isolation valw A0-2512 was blocked for construction modification to the air supply system to the valve.
In this condition, the boot seal on that butterfly valve was def1sted and the valve was inoperable.
Apparent Cause of Occurrence:-
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Due to the construction work t= Mag place on AO-2512 in close proximity to 2 -2511, the needle valve is the supply to the boot seal was inadvertently brushed against and closed.
Samil fitting leaks between the needle valve-and the boot seal caused the volume to depressurize sufficisatly to cause i
the alarm.
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a==1ysis of Occurrence:
-- Although the boot seals are believed to have been def1sted on both isolation v=1ves, the butterfly portice of the valves were closed. Thus a restricted j
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flow path axisted to the ventilatica dust supplying the stand 67 gas
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tnatment filter and the equipment call ewh=mt filters.
Valves and dampers-i
___ in those ducts were closed... No1 increase la either main or veut stack release
' t-3Q{ was observed during the period of suspected boot deflation. The acessure was-j --; g restored to the boot seelgast AEE.25n iniamynximately 90 minutes, go1
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Corrective Action M_
emme After the needle valve @ re-opened, primary containment integritywasd re-established.
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Very truly yours,
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U. S. NUCLEA7 REIULATORY COMMISSION NRC FORM 366 (7 77)
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