ML20086H718
| ML20086H718 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/23/1975 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086H716 | List: |
| References | |
| AO-75-49, NUDOCS 8401200140 | |
| Download: ML20086H718 (1) | |
Text
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' PRI!ADELPHIA ELECTRIC' COMPAfM '
Botcom Atomic Pow 2r Statt Delta, Pennsylvanim < '
l 3..
17314
~
l June 23,1975. -
dr Jcmes P. O'Re1117%. Director
@ffice of Inspectio.n and Enforcement.
'Racien.1 -
D Wnited. ' States Nuclear.. kegul' tory-Commission t...
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G31. Park Avenue King Of Prussia, Pennsylvania 19406 Gubject:., Abnorms1 Occurrence 24-Hour Notificatiog-Confirning J..F. Franz' phone conversation. with Mr Jim Partlow, Region 1,.
Taited. Seetes. Nuclear :Regulatorya Commission:. on June;.21,.1975..
Reference:
License Number DPR.
Technical Specification. Reference.:.e 3.5.A..
Report No.:
50-277-75-49.-
Report Date:
June 23, 1975 Occurrence Date:
June 21, 1975 Pacility:
Peach Botton Atomic Power Station-Idanti R.D. 1 Delta Pennsylvania 17314 Identification of Occurrence:.
Failure of operator motor on RER system valve MO-2-10-154B.-
Conditions Prior to Occurrence:
Reactor shutdown and depressurized.
Description of. Occurrence;~---- - -"
During the use of the RER system in the shutdcun cooling mode, the 154B valve was-positioned canually from the control,roon,,to adjust flow.
During this operation, it was noted.that the lielt lights on the valve indicated an. abnormal condition..
An inspection of the valve revealed that the sten anti-rotation key had fallen-out, resulting in rotation of the sten.
This rotation without. valve translation.
upset the calibration of the operator.
Apparently.the stem anti-rotation key had become ja==cd between the anti-rotation arm and. the packing follower which resulted in c cessive 1 cad being applied to the cotor as it attempted to cave the stem.
Thi-in turn, caused the tsocor to feil electrically.
Dasignation (,f Apparent Cause of Occurrence:
Under investigation.
Analysis of Occurrence:
Safety significance of this incident is ninimal since the recetor.vas chutdown and depressurized.
Shutdos.n cooling van still availabic to the reactor thru the 'A'
.RuR loop and.if nuaded, the.154B valve could have been positioned manually from the l operator.
Corrective Action:
The, sten key and motor operator.will be.xcpAaced. pp. coon as possible.
cilure'ata-D Previously reported Abnonnal Oc :urrences 277-7h.32, 2'77-7e5,'-5 and 278-74-35.
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I 8401200140 750701
'e / trul our gDRADOCK05000
. T. Ullrich, uperintendent
}y each Bottom Atomic Power Station COPY SENT REGION m