ML20086J443

AO 74-8:on 740918,hydraulic Snubber Found Inoperable. Caused by Locknut Not Tightened Properly.Snubber Correctly Positioned & Locknut Adequately Tightened

ML20086J443
Person / Time
Site:	Peach Bottom
Issue date:	09/28/1974
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
AO-74-8, NUDOCS 8401230682
Download: ML20086J443 (2)

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PHILADELPHIA ELECTRIC COMPANY 50-278 2301 MARKET STREET s. . .

PHILADELPHI A. PA.19101

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September 28, 1974 Mr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing Washington, D.C. 20545

Subject:

Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack, A.E.C. Region 1 Regulatory Operations Office on September 19, 1974.

Written notification was made to Mr. James P. O'Reilly, Region i Regulatory Operations Office on September 19, 1974. In accordance with Section 4.7.2.A of the Technical Specifications, Appendix A of DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the following report is being submitted to the Directorate of Licensing as an Abnormal Occurrence.

Reference:

License Number DPR-56 Technical Specification Reference .3.5. A.3 Report No.: 50-278-74-8 Report Date: September 28, 1974 Occurrence Date: September 18, 1974 Facility: Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:

Inoperable hydraulic snubber.

Conditions Prior to Occurrence: -

, Maintenance outage in progress. Reactor shutdown.43-878 ,

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Mr.A.Giambu%74 September 28, Pc.g 3 2 o..%

Description of Occurrence:

During a routine inspection of the Unit 3 hydraulic snubber during a plant maintenance outage, hydraulic snubber 3-lO-HB-5-7 was observed to have become inverted resulting in the draining of all hydraulic fluid out of the reservoir vent.

Designation of Apparent Cause of Occurrence:

Investigation indicates that the locknut which prevents rotation of the snubber mechanism was not tightened properly.

Analysis of Occurrence:

The defective snubber is installed on the discharge piping of the "B" RHR pump for seismic support only. It serves no function during normal plant operations.

Corrective Action:

The snubber was correctly positioned and the locknut adequately tightened. The reservoir was filled to the correct level and the piston was stroked several times to remove all air from the hydraulic system. All similar snubbers, which were readily accessible (approximately 525) were inspected and found i to be tight.

Failure Data:

There is no record of a similar failure.

Very truly yours ,

1. J . Cooney Ass' Gen'l Super ntendent Gene ation Division cc: J. P. O'Reilly Director, Region 1 United States Atomic Energy Commission 631 Park Avenue King of Prussia, PA 19406 t

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