ML20058H294
| ML20058H294 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 11/05/1990 |
| From: | Fay C WISCONSIN ELECTRIC POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CON-NRC-90-109 IEB-88-010, IEB-88-10, VPNPD-90-457, NUDOCS 9011150154 | |
| Download: ML20058H294 (2) | |
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Wiscorson i
lilOctI?D l
POWER COMPANY l
231 W Mcho:n PO. cre 2046. MMoukee, WI $3201 (414)221 2345' VPNPD-96-437 NRC-90-io9 l
.l November F, 1990 j
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U.
S. NUCLEAR REGULATORY COMMISSION
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Document control Desk Mail Station P1-137 Washington D. C.
20555 j
i Gentlement i
DOCKETS 50-266 AND 50-301 i
l UPDATE TO RESPONSE TO NRC BULLRTIN 88-10 j!
NONCONFORMING MOLDED-CASE CIRCUIT BREAKERS POINT BEACH NUCLEAR PLANT. UNITS 1 AND 2 NRC Bulletin 88-10 dated November 22, 1988 requested that Licensees j
take actions to provide reasonable assurance that molded-case circuit breakers purchased for use in safety-related applications
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without verifiable traceability to the circuit breaker manufacturer t
are capable of performing their safety' functions.
Electric, Licensee, responded to this. Bulletin in a letter dated March 30, 1989.
A-letter dated May 16,.1990 provided an update on the status of the required actions.
'In accordance with the commitments of that letter, the untraceable circuit breakers ~in battery chargers D107 and,D108 have been replaced.with acceptable circuit breakers.
Battery charger D109 circuit breakers will be replaced prior to completion of our current Unit 2 refueling outage.
i At the completion of current Unit 2 outage we wil';have completed l
l the actions outlined in our March ~30, 1989 submittal with the-i l
exception of the replacement of the untraceable circuit breakers in inverters 1DYO3, 2DYO3,^DYOC, 1DYO4, 2DYO4~and DYOD.- In our May 16, 1990 letter we committed to replacing the. circuit. breakers.
associated with the Unit l' inverters.within thirty days'of receipt and quality assurance verification.of appropriate replacement circuit breakers..At that time we anticipated that the circuit i
breakers associated with the Unit 2 inverters would~be replaced-
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prior to start-up from the fall'1990 refueling outage in-e accordance with the commitment made'in the March 30, 1989
' submittal.
Acceptable replacement circuit-breakers for the inverters,. both Unit 1 and-2, have yet to be received..We have established, based on information from General Electric,.the manufraturer.of,these1 i
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November 5, 1990 Page 2 circuit breakers, that the circuit breakers installed in the inverters, types THJK 426-400 and TJJ 426-400, are of a style that is now obsolete.
We also id'atified an additional concern in that t
the existing circuit breake s have internal auxiliary contacts and an undervoltage release device.
The current model of these circuit i
breakers do not utilize the same style of internal devices but rather mount the contacts external to the circuit breakers and provide the release device as an integral part of the trip unit.
The design of the PBNP inverters does not allow for such an arrangement.
These conditions have caused delays in our replacement of the untraceable circuit breakers since there is no direct replacement for the existing circuit breakers.
We have been consulting with General Electric to determine the best courae of action regarding the replacement of the untraceable circuit breakers.
Proposals from General Electric received on October 23, 1990 are being evaluated.
The proposals address the need for replacement breakers and associated auxiliary devices and project a lead time for breaker procurement of from 14 to 20 weeks.
One option proposed will also require modifications to the inverters themselves.
Accordingly, it appears that the replacement of the untraceable circuit breakers and completion of our commitments in regard to Bulletin 88-10 will not occur until the second half of 1991.
We have again reviewed the existing justifications for continued operation (JCO) applicable to the untraceable circuit breakers in I
the inverters.
The justifications are still applicable and we have l
concluded that continued operation of both units until the existing I
circuit breakers can be replaced will not constitute a significant safety concern.
Please contact us if you have any questions concerning this I
information.
Very trul
- yours, b'
h fY C. W.
Fay Vice President Nuclear Power Copics to NRC Pegional Aininistrator, Region III NBC Resident Inspector s
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