ML19220B664
| ML19220B664 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/28/1977 |
| From: | Arnold R Metropolitan Edison Co |
| To: | O'Reilly J NRC Office of Inspection & Enforcement (IE Region I) |
| References | |
| GQL-0401, GQL-401, NUDOCS 7904270189 | |
| Download: ML19220B664 (1) | |
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/ METROPOLITAN EDISON COMPANY sus:::m as as:.enu::uc ununi::= nann n i
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Mr. J. P. O'Reilly U. S. Nuclear Regulatory Cec =issien Office cf I:specticn 5 Inforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 194C6
Dear Sir:
Three Mile Island Nuclear Statien C 1: 2 (OC-2)
License No. C??R-66 Oceket No. SC-320 480 "ol: Motor Centrcl Centers ITE-E'"1 Catalog Type HE-3 Circuit 3:eakers
Reference:
(a) AEC/ORO letter, Oceke: 50-320 and Cperations Zulletin 74-8 dated 7/31/74 (b) Metropoli:an Edisce letter, R.C.Arr$1d to J.P.0'Reilly dated S/22/~iL aa e subject AEC 3ulletin No. 74-8 " Deficiency in ITE Molded Case Circuit 3:eakers, Type EI-3" identified problems vith I"JE Type EE-3 breakers manufactured pric to May 1974, not tripping in accordance with =anufse:urer's curves.
In response to this bulletin, Met Ed ack:culedged the potential for similar problems at OC Uni: 2 and stated that pre-eperaticnal testing vculd previde the required data for evaluation of the subject breakers.
Althcugh on-site testing of all EI-3 colded case circuit breakers is net yet ec ple:a, 207 of the subject breakers have been tested to date.
Cf the 207 tes:ed, 127 (or 61*.) have failed :o meet the fixed instantaneous trip se::ing specified by the manufacturer's curves.
CPU Service Corporation is presently centacting Gc,uld/ITF I perial to precure replace =en: breakers for these which have failed to meet the 2:ufacturer's curves. Also, G?U Service Corpera:1cn is attempting to de:er:1:e whether er uct
- hese breakers were manufactured pric: to May of 1974. All questionable breakers will be replaced prior to ini:ial fuel loading.
Very truly yours,
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I hiXA &Q c c : Dr. r.,rns: 7algenau,01 rector
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Office of : spection &
. C. Ar:cid Enforcement 71ce Presiden:
U.S. Nuclear Regulaco y Cc==issic:
bl~III Washington, J. C. 20535 w..: :._
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