ML20086K918
| ML20086K918 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 03/06/1974 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086K912 | List: |
| References | |
| AO-74-7, NUDOCS 8402070074 | |
| Download: ML20086K918 (1) | |
Text
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Pili!ALEIJ3IA EIETRIC CCA!W J-Peach Botto: Ato:ic Power Station Lelta, Penncylvania 17314 h
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March 6, 1974 d / 6 3 3 7 / / [ ()
Mr. Jameo P. O'Reilly, Director United States Atomic Energy Co=:icsion Directorate of kcguistory Opcrations 631 Fark Avenue Eing of Prucsin, Pennsylvanis 19406
Subject:
Abnorent Oecurrence 24-Eaur Notification I
Confirmir.g t:y conversation with Mr. R. A. Teil, A.E.C. Region 1 Regulatory i
Operatiene Office on March 6, 1974
Reference:
Licence Number DPR 44, Anendment Number 1, Technical Specifiestion Table 3 7.1 Report No.:
M-277-74-7 Report Date:
3/6/74
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Occurrence Date:
3/5/74 Facility:
Peach Bottc= Ato:ic Power Station - Unit 2 R. D. 1, Delts, Pennsylvania 17314 Identificatien of Occurrence:
A. A rain steam isolation valve closing time slightly exceeded the muicum per=issib,le operatir.g time.
B. The drywe'll floor drain c/q pump outboard isolation valve failed to close on a Group II isolation signal.
Conditions Prior to Occurrence:
Reactor at approximately 2 % power and stable.
Main eteam isolation test initiated.
Lescription of Occurrence:
g kring the main stese line isolation tect initiated from 2% power, A.
W a.
f all rain steam isolatior. valve clocur.e times were recorded. Tne closing tioe for A0-2-2-60A vns 31 seconds. Thio exceeds the g
r:axicum allowable operatir.g tire of 5 seconds provided in the hac Technical Specifications.
88 B.
Mrir.g the Group II isolatien cauced by low reactor vessel level
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following the isolstion of. the main steam lines. A0-2-S3.
.the outboard icolation valve for the drywell floor drain sump pu=p failed l h to cloce.
Desirr.ntion of Apparent Cause of Occurrence:
A.
The cause for the slight change in valve closing speed. hse r.ot been-identified to date.
s, tj B.
Preliminary investigation indicates that the solenoid valve ac:meiated ~
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with A0-2-33 failed to port properly when the'colenoid vsa de-energined.
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Ar.alyeie of Occurrence:
A.
Main steam line isolation was properly. acco:rpliched within the allowable 1
4 tite frr..e during the test. The small' increase. in operating tiee of the -
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Ar.nlycie of Cer rence:
(Cont'd)
The fl[j drain cu=p purp diccharge li:p\\nc both an inboard and E.
v outboard icolation valve. Proper operation of the inboard vnive no a recult of the Group II icolation cignal properly icolated thic line. No nafety significnr.ce is attached to this occurrence.
Corrective Action:
A.
16I7 A0-2-2-30A chall be adjusted, stroke tested and tired prior to reactor stort-up.
B.
Proper operation of A0-2-33 will be verified following repair or replaccccnt of the associated solenoid valve.
M dd7M W. T. Ullrich, Superintendent Pench Bottom Ato ic Power Station.
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DR Central Mail & Fil as A0 74-7 TO (Name and unit) in 11 ALS RLMAAAS The above A0 is forwarded for information.
OGC Distribution will be made by this office o,,,
to the PDR, Local PDR, NSIC, DTIE, 1
TO (Name and unst)
INinALS RLMAAfd and State Representatives, t
DATE F ROM (Name and unit)
RE M ARK 5 Of O C>J;' t$t%,
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PHOhE NO.
DATE 8-337-1246 3/11/74 4
VSE OTHER SIDE FOR ADDITIONAL REMAPK$
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