ML19242B226
| ML19242B226 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 07/09/1979 |
| From: | Andognini G BOSTON EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7908070702 | |
| Download: ML19242B226 (2) | |
Text
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[TC B O STO N EDISON COMPANY oENERAC OFFICES SCo 00YLSTON S T R EET BOSTON, M ASEACHUEETTs o 2199 G. CARL ANOOG NHM SUPERINTENDENT NUCLEAR OPERATIONS OEPARTMENT July 9, 1979 BECo. Ltr. #79-138 Mr. Boyce II. Grier Office of Inspection and Enforcement Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA.
19406 License No. DPR-35 Docket No. 50-293 Rasponse to IE Bulletin 79-11
Dear Sir:
In a letter dated May 22, 1979, you transmitted Bulletin No. 79-11, titled
" Faulty Overcurrent Trip Device in Circuit Breakers For Engineered Safety Systems".
Boston Edison Company was requested to take the following actions in a review of this prob 1'.m at Pilgrim Station:
1.
Determine whether c2 cuit breakers of the above described manufacturer and type with overcurrent trip devices are in safety related Class IE service or in spares at your facilities.
% )m '-) )h2
Response
No Westinghouse circuit breakers Models DB-50 or DB-75 are installed in safety-related systems at Pilgrim Station.
2.
If the subject breakers r.re in service in safety-related systems: within 30 days, review the cristing test data for all overcurrent trip device calibrations since plant startup or since replacement caps were installed and tested in response to Bulletin 73-1, whichever is nost recent. Deter-mine if any delay times are:
(1) outside of the acceptance band; (2) marginally acceptable on the low side of the acceptance band; or (3) if any significant change in delay time performance has been observed.
These breakers should be retested and end caps replaced as necessary to assure no loss of safety function.
Response
No applicable per response tc
- 1.
2 3.
Inspect all end caps in spares for cracks using at least a 3x magnifying glass.
Caps having visible flaws should be discarded, or prevented from use in Class IE applications.
79 08070 7cn Q)
B O STO N EDISON COMPANY Mr. xyce H. Grier July 9, 1979 Page 2
Response
Not applicable per reoponse to Item #1.
4.
Review teet procedures and test schedules for all safety-related circuit breakers to assure that all such breakers are tested at least each refueling outage to confirm overcurrent time delay protection.
Response
Testing to assure overcurrent trip protection on the safety-related circuit breaker is performed each refueling cycle.
We trust that you will find this information satisfactory: however, should you desire additional information, please contact us.
Very truly yours,
[
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Attachments cc:
Director Office of Nuclear Reactor Regulation Division of Proj ect Management Operator Licensing Branch 3
522 Washington, D.
C.
23555
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