ML20086J071
| ML20086J071 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 01/20/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20086J073 | List: |
| References | |
| AO-75-5, NUDOCS 8401230101 | |
| Download: ML20086J071 (2) | |
Text
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s PHILADELPHIA ELECTRIC COMPANY c/,7u,,;} -
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2301 MARKET STREET PHILADELPHIA, PA.19101 e
(215) 8414ooo
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NQt' January 20, 1975 Mr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing Washington, D.C.
23545
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack, A.E.C. Region 1 Regulatory Operation's Office on January 10, 1975.
Written notification was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on January 10, 1975.
In accordance with Section 6.7.2.A of the Technical Specification, Appendix A of DPR-56 for Uni t 3 Peach Bot tom 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.B Report No.:
50-278-75-5 Report Date:
January 20, 1975 Occurrence Date:
January 10, 1975 Facility:
Peach Bottom Atomic Power Station R.D.
1, Delta, Pennsylvania 17314 Identification of Occurrence:
Failure of support flange on IIPSW/RIIR heat exchanger discharge valve motor (50-310-89B).
Conditions Prior to Occurrence:
Reactor shutdown.
Primary cooling temperature is approximately 1500F.
f y.2 7 8401230101 750120 PDR ADOCK 05000278
' h-S PDR Out'1 TENT REGION
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Mr. A. Giambusso i
January-20, 1975 Page 2 a
s Description of Occurrence:
During. routine operations of the shutdown cooling mode of the RilR system,'the flange used to bolt the motor to the valve operator gear casing on NO-3-lO-89B failed.
The flange is an integral part of the motor end bell casting.
As found, the valve was approximately 1 1/2" open.
Designation of Apparent Causo of Occurrence:
High valve vibration, due to the throttling mode of the valve caused the valve sicm to hammer the packing out of position and caused a fatigue failure of the motor end bell casting.
v Analysis of Occurrence:
The safety significance of this occurrence is considered minimal, since no cooling capability of the RIIR/IIPSW was lost.
The valve failed in the throttled position.
Corrective Action:
TIve mu6vr-casta.ng was replaced and the valve was_re -
turned to normal service.
Failure Data:
Similar difficulties have been reported as Abnormal Occurrences on these reports:
AO-50-277-74-53, AO-50-278-74-28, AO-50-278-74-35, and AO-50-278-74-36.
, Very truly yours, k
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(!y [
M. J. Cooney..
Ass't Gen'l Superintendent Generation Division Mr. J.
P. O'Reilly.
cc:
Director, Region 1 United States Atomic Energy Commission 631 Park Avenue:
~ King of Prussia, PA 19406 s
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