ML20086J147
| ML20086J147 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 12/10/1974 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086J144 | List: |
| References | |
| AO-74-36, NUDOCS 8401230251 | |
| Download: ML20086J147 (2) | |
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- Peach Dottom Atomic Power Station MO+W N N' Delta, Pennsylvania v
17314 1
December 10, 1974
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Hr. James P. O'Reilly, Director United States Atomic Energy CoppiBuion Directorate of Regulatory Operations 631 Park Avenue King of Prunnin, Pennsylvania 19406
Subject:
Abnormal Occurrence 24-1 tour Motification Confirming W. T. Ullrich'n conversation with Mr. Walt Daunack, A.E.C. 1974 Region 1 Regulatory Operationn Of fice on December 10,
Reference:
Licenue Number DPR-$6
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Tech'nient'specificotfon Refcrencei '3.5.B
- _ _ _ _.._ _ r Report No.:
50-270-74-36 Roport Date:
December 10, 1974 g
Occurrence Date:
December 10, 1974 Facility:
Peach Botton Atomic Power Station R.D. 1, Delta, Penney.1vanin 17314 Identif3cntion of Occurrence:
I Failure of limitorque notor support on HPSW/RilR heat exchnnger dincharge valvo l'0-3-10-8!1A.
Conditions Prior to Occurrencer
.l Unit shutdown.
RHR chutdown cooling mode in service.
i Deucription of Occurrence:
During the operation of valve MO-3-10-89A in connection with pIncing the
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RHR nud HPSW system in nervice to cool the prhoary synten with the reactor shutdown, the nubject valve motor support failed.
The valve nt i
thin time van in a throttled position.
Decignation of Apparent cause of Occurrencet During operation i thosa valven are subjecc to vibration.
The enp l
screws which hold the limitorque motor operator to nn adapter pinte vere found to be broken.
Thin may have been caused by the cap screvn not being tightened properly, j
e Analysin of occurrenect l
In thin The failure of the cap perevs renders the valve ~ inoperablo.
case the valve f ailed in a partin11y thrott. led position but very clone Adequate decay hent renovn1 capability van available uning to open.
the other DHR heat achungera.
Minir.nl cafety pinnificance to uttnehed l
to this failure, p a,N, /
12752
.I 8401230251 741220
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PDR ADOCK 05000278 S
PDR iXFY SENT REGION
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2 Abnoron1 Occurrence 24-Itour Notification Report No. 50-278-74-36 Corrective Action:
The motor is being removed and tented.
Nov cap screws will be installed, torqued to the proper values and necured with IA)C-TITE.
Inopection of t.he rer:sining valveu used in the same service will be perforr.ed sequentially for similar defects.
Failure Data:
Similar difficulties have been reported as Abnormal Occurrence P,eport 1:u:=bern 50-277-74.-53, 50-278-74-28 and 50-270-74-35.
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Vcey truly youra,
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i p,,.-r.>y g W. T. Ullrich, Superintendent.
Peach 110ttom Atomic Power Station.
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