ML19242B223
| ML19242B223 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/03/1979 |
| From: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7908070698 | |
| Download: ML19242B223 (2) | |
Text
pg TZc PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 SHIELDS L. D A LTROFF biCE PmEslDENT ELECTRIC PROCUCTION July 3,
1779 IE Sulletin 70-11
- r. 3oyce :1. '; r i e t, Director 7 e :;i on I Oftice of Inspection & Inforcement U.S.
'!u c l e a r 'e3ulatory C o.mi s a i ca 531 Park Avenue King of Prussia, PA
- 1. ** 0 6
Dear '! r. Grier:
This letter is in response to IE Sulletin o.
70-11, forwarded to us on
.ay 22, 1979, concarnin; failures of
'le s t in gh ou s e type 03-50 and DB-75 circuit breahers used la safety related systens.
1.
7etermine whether circuit breakers of t l' c above described nanufacturer and type 'rith overcurrent trip devices are in safety related Class I-service or in spares at your facilities.
5,22 r2 6 p l e s ?_C n 3 e_
. e s t i n '; 1 o u a e tyue
-5n and 7"-75 breahers re not useo in safety related Class 15 service.
2.
If the subject breakers are in service in safety-relate-systens, zithin 30 days, review the existin' test data for all overcurrent trip device calibrations since plant startup or since replacement caps tere installed and tested in response to Lulletin 73-1, "hichever is ;ost recent.
Deterr.ine if any dela" times cret (1) outside of the acceptance band- (2) r.a r ;i n a lly acceptabla on the low side of the acceptance ban:
or (3) if any si;nificaat change in dela" tinc perfornance has ceen observed.
These areakers shoul. ce rctested and end 7 9 080p ((@
C
(
ML ar.
'oyce
'!. Crier, Director Pa,e 2
caps replaced as necessary to assure no loss of safety function.
lesponse iot applicable since we do not use this type of breaker in safety related Class IT service.
3.
Inspect all end caps in spares for cracks using at least a 3x aagnifying 3 1ars.
Caps having visible flaws should be disca-ded, or prevented from use in Class IP applications.
T e s 2 o r. s e
- I o t applicable since ue do not use this type of breaker in safety related Class IE service.
4.
Review test procedures and test senedules for all safety-related circuit breakers to assure that all such breakers are tested at least each refueling outaaa to confirn overcutrent tire delay protection.
Response
.ot applicable since ue do not use this type of breaker in safety related Class Ir service.
If vuu r2 quire any a d d i t i o-information or have any questions, please coatact us.
7ery truly yours,
//
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U n i t o ri 3tates :u cle a r e.;ulatory Connission Office of Inspection L nf orce aent Division of '. e a c t o r C,2 rations Inspectio:
'a s: ia ;t oa, SC 23335 522 26i