ML20086K899

AO 74-30:on 740601,RHR Containment Spray Outer Valve Operator MO-2-10-26A Failed.Caused by Improper Support of Valve Coupled W/Line Vibration.Valve Operator Aligned,Motor on Valve Operator Replaced & Addl Support Added

ML20086K899
Person / Time
Site:	Peach Bottom
Issue date:	06/11/1974
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
AO-74-30, NUDOCS 8402070063
Download: ML20086K899 (2)

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PHILADELPHIA ELECTRIC COMPANY ,4 .

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PHILADELPHI A. PA.19101 ,,

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June 11,1974 -

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Mr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Conunission 50-%774 Directorate of Licensing Washington, DC 20545

Subject:

Abnormal Occurrence The foilowing occurrence was reported to Mr. Phil Stohr, AEC, Region 1 Regulatory Operations Office on June 2, 1974. Written notifi-cation was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on June 3,1974. In accordance with Section 6.7.2.A of the Technical Snecificeinns A,n,nandiv a nf noo 1133 fe ij,it 2 pe: h ge ::,-,

Atomic Power Station, the following report is being submitted to the Directorate of Licensing as an Abnormal Occurrence.

Reference:

License Number DPR-44, Amendment Number 1 Technical Specification 3.5.A and Table 3 7.4 Report No.: 50-277-74-30 Report Date: June 11, 1974 Occurrence Date: June 1,1974 Facility: Peach Bottom Atomic Power Station R. D.1, Delta, Pennsylvania 17314 Identification of Occurrence:

The RHR containnent spray outer valve operator (M0-2-10-26A) failure.

Conditions Prior to Occurrence:

Reactor shutdown with primary coolant temperatures less than 212 F and reactor pressure vessel vented.

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J Description of Occurrence:

During 'a plant outage, a routine inspection showed that the subject valve motor casting had broken away from the valve operator.

The motor was still attached to the operator by way of its output shaf t.

Designation of Apparent Cause of Occurrence:

Improper support of valve, coupled with line vibration, re-sulted in breaking of the motor end bell casting.

Analysis of Occurrence:

The RHR system is equipped with two individual sub-systems capable of providing a water supply to the drywell spray headers. The inability to open a single valve to one of the spray headers does not prevent the operation of the containment spray-system. These valves are utilized following an accident which results in steam accumulating in the drywell and are manually operated. There is no logic associated with these valves. This occurrence, therefore, has minimal safety significance.

Corrective Action:

Tine vaive instaliation was inspected. uuring tnis. inspection I it was noted that the valve operator.was,not properly bolted to the yoke assembly.. Corrective action consists of properly aligning the valve operator with the yoke, replacing the motor on the valve operator, and adding additional support to the valve and its operator.

Failure Data:

No previous failures have been reported on this valve.

Very truly yours,

/d of'r@y-M. . Cooney As 't Gen' t Sdperint endent Generation Division ec: Mr. J. P. O'Reilly Director, Region i United States Atomic Energy Conunission 631 Park Avenue King of Prussia, PA 19406 L.