ML20086J147

Telecopy AO 74-36:on 741210,Limitorque Motor Support on Hpsw/Rhr HX Discharge Valve MO-3-10-89A Failed.Caused by Broken Cap Screws Which Hold Limitorque Motor Operator to Adapter Plate.Motor Being Removed & Tested

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: ML20086J141 ML20086J147
References
AO-74-36, NUDOCS 8401230251
Download: ML20086J147 (2)

Text

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Peach Dottom Atomic Power Station "

Delta, Pennsylvania v MO+W N N' 1

- 17314

^ December 10, 1974 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 ~ ~~ ' ' '

Tech'nient'specificotfon Refcrencei '3.5.B

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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.

.l Conditions Prior to Occurrencer RHR chutdown cooling mode in service.

Unit shutdown.

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Deucription of Occurrence:

During the operation of valve MO-3-10-89A in connection with pIncing the 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 screws which hold the limitorque motor operator to nn adapter pinte l

vere found to be broken. Thin may have been caused by the cap screvn j _

not being tightened properly, '

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Analysin of occurrenect 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 to open. Adequate decay hent renovn1 capability van available uning the other DHR heat achungera. Minir.nl cafety pinnificance to uttnehed l

to this failure,

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8401230251 741220 PDR ADOCK 05000278

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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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W. T. Ullrich, Superintendent.

Peach 110ttom Atomic Power Station.

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