ML20086G883
| ML20086G883 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/12/1975 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086G881 | List: |
| References | |
| AO-75-34, NUDOCS 8401120570 | |
| Download: ML20086G883 (1) | |
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V; P!IlLADELPill A E!.ECTRIC CO.'tPANY Peach Bottoa Aconic Power Station.
Delta, Pennsylvania L
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- 1731, June 12, 1975 Er. James P. O'Ecilly, Director A
Office of Inspection and Enforcerent.
ilegion 1 p
Unitec'. Staten Nuclear Regulatory Cornission :
72g4 6';l Park Avenua idug of Prussia, Pennsylvania 19405
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Abnormi Occurrence 24-lim 2r Nori fication Confirning W. T. Ullrich's phone conversation with Mr. L' alt Eaunack, Region 1. United Staten Nuclear Regulatory. Cor mission on Jene 12,1975...
.' License Nu ber hPb%
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Reference:
Aechnical Specification
Reference:
4.7.D i
I i Pepart No. :
.v.cport Date:
/ June '12', 1971 necurrence Date: June ll, 1975 Frcility:
Pea:h Lotton Atomic Power Station T U.
1, Im?rWITnnsylvnTia 17314
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Identification of Occurrence:
l' allure of the C" Ti? uachine ball. valve to cleso Conditions Prior to Occurrence:.
Unit 3 at 50:; power.-
- Dencription of Occurrence
l During routina operation of the TIP tsachines, the "C" detector failed to stop at the-a chield linit and close the ball valve as it was being withdrawn to the shield chamber.
i Desigaatien of Apparent Cause of Occurrence:
The chield li-.it cvitch, which 'controlo detector trr.vol and ball valve oper.ition, failed to operate when the detector reached the "In chield" position. This allowed i
q the detector to continue its withdra.ral untII' It was cLanuaIIy stopped.
Lins 3:, ain sE=.cccurcr.me --- -
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're failure oi' tl.o linit r.vitch to halt the withdrawal and closc the ball valve was incudiately obr,crved and corrected by r. witching to the nanual tode of operation aud-I t
steppin;; the nachine, The ability to close the ball valve by turning the.nachine-off
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(de-c u rgize tu close) was verified-and would have been available if required j
Therefore, there are no aafety implications to this occurrence.
!Correctiva Action:
The detector van returned to its in-r,hield position. The e.achine was de-4ncrgized..
i r.nd the ball valve was verified to be closed. Administrative procedures were i
initiated to ensure that the TIP cachine rec.ains in this condition'until the limit I
cuitch'c( f ailure to operate can be investigated and repaired.
Failure Data:
,On6 picVioua ' failure.'of' thin ' type ' reported iri 50-278-7S*31% '
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Very truly yoursl-
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