ML20086G899
| ML20086G899 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/03/1975 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086G898 | List: |
| References | |
| AO-75-31, NUDOCS 8401120586 | |
| Download: ML20086G899 (1) | |
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PHILADELPIIIA, ELECTRIC COMPANY yjg g
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Peach Pattos Ato:ic Power Station W
Delta, Penrsylvania 17314 /-
June 3, 1975 Mr. James P. O'Reilly, Director Office of Inspection and Enforcement-Region 1
.. United States-Nucient-Regulatory Co=nission.
631 Park Avenue
.. Kicg of. Prussia,: Pennsylvania 19406 Subject; nnnrt-al Occurrence 24-IMur Notification
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Confirming R. S. Fleischmann's phone. conversation ~ vith Mr. Walt T>aunacic, Region 1 i;ni States Nuclear Regulatory Cor=ission on June 3,1975 o
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Keport No..:
50-M-75 311
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Occurrence Date: June 2, 1975 Facilityt Fench Botton Atonic Power Station
- 1. Q_lt;a. Penarylvania 17314 R.D.
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Identificatica of Occurrence:
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T P "- + - h,1?.v21ve en cims. _
Conditions Prior to Occurrence:
Unit 3 at 50 power.
Dcocription of Occurrence:.
During routine operation. of the TIP cachines, the
'B' detector failed.to stop nt the shield linit and close the ball velve as it was being withdrawn to the shield che-n:o Designation of Apparent Cause of Occurrence:
The chield li=it switch, which controls detector travel and ball valve cperation.
failed to operate when the detcetor resched the "in shield" position. This allowed the detector to continue ito withdrawal until it was manually stopped Analysis of Occurrenec:
The failure of the li=it switch to halt the withdreval cnd close the ball valvu vas incediately obcerved and corrected by switching to the.anual code of operation ani stopping the e.achine.
The ability to close the ball valve by turning the rachine vi (de-energice to close) was verified and would have been availcble if required.
Therefora, there are no stafety it:plications to this occurrence..
Corrcctive I.ction:.
A The detector was returned to its in-shield position. The cachine vos de-tr.ergized, r.nd the ball valve was verified to be closed.. Administrative procedures were initiated to eruture that. the TIP tuchine rc=.ains in this condition until the licit switch can be repaired..
Failure Data:
No prevacus failures of this type.
Vegtr;ily yours, f, f /M **4*.~
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W. T. Ullrien, Superintencent Pecch Tatton Ato:ic Power Scation s
t 8401120586 750612 l
PDR ADOCK 05000278 8
P,DR Y SENT REGION '7 -_
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