ML20148Q724

Responds to NRC Bulletin 88-001, Defects in Westinghouse Circuit Breakers. No Westinghouse Models DS-206,DSL-206, DS-416,DSL-416 or DS-420 Breakers in Class 1E Circuits at Hatch

ML20148Q724
Person / Time
Site:	Hatch, Vogtle, 05000000
Issue date:	04/07/1988
From:	Gucwa L GEORGIA POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
IEB-88-001, IEB-88-1, SL-4446, TAC-65955, TAC-65956, TAC-67675, TAC-67676, NUDOCS 8804130275
Download: ML20148Q724 (5)

Text

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,3 At!anta, Georg a 30308 Trephone 404 526-6526 Maling Adtess.

Post Oace Box 4545 At'anta. Georg a 30302 Georgia Power L.T.Gucwe F* 8M" N'C 3YSI""

Manage Nuciear Safety SL-4446 and Lcensno 0887U X7GJ17-C110 April 7, 1988 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Hashington, D. C.

20555 PLANT HATCH - UNITS 1, 2 NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5 PLANT V0GTLE - UNITS 1, 2 NRC DOCKETS 50-424, 50-425 OPERATING LICENSE NPF-68 CONSTRUCTION PERHIT CPPR-109 TACS 65955/65956 RESPONSE TO NRC BULLETIN 88-01 "DEFECTS IN HESTINGHOUSE CIRCUIT BREAKERS" Gentlemen:

The subject NRC Bulletin, dated February 5,

1988, requested that Georgia Powar Company submit a letter of confirmation for completion of inspections for certain Westinghouse circuit breakers.

The Georgia Power Company response is provided in the enclosure to this letter.

If you have any questions in this regard, please contact this office.

Mr.

L. T. Gucwa states that he is authorized to execute this oath on behalf of Georgia Power Company, and that to the best of his knowledge and belief the facts set forth in this letter are true.

Sincerely,

%~ h L. T. Gucwa Sworn to and subscribed before me this 7th day of April, 1988.

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Notar9Public

% % cassion osuus.h HJB/ju k ta,im

Enclosure:

Response to NRC Bulletin 88-01 c:

(see next page) l$0* $00h !

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GeorgiaPower A U. S. Nuclear Regulatory Commission April 7,1988 Page Two c: Georala Power Comoany Mr. J. T. Beckham, Jr., Vice President - Plant Hatch i

Mr. P. D. Rice, Vice President and Vogtle Project Director Mr. G. Bockhold, Jr., General Manager - Plant Vogtle GO-NORMS U. S. Nuclear Reaulatory Commission. Washinaton. D. C.

Mr. L. P. Crocker, Licensing Project Manager - Hatch Mr. J. B. Hopkins, Licensing Project Manager - Vogtle (2 copies)

U. S. Nuclear Reaulatorv Commission. Realon II Dr. J. N. Grace,' Regional Administrator ~

Mr. P. Holmes-Ray, Senior Resident Inspector - Hatch Mr. J. F. Rogge, Senior Resident Inspector, Operations - Vcgtle Mr. R. J. Schepen, Senior Resident Inspector, Construction - Vogtle 9

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0887U i

P00775

GeorgiaPowerA ENCLOSURE PLANT HATCH - UNITS 1, 2 NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5 PLANT V0GTLE - UNITS 1, 2 NRC 00CKETS 50-424, 50-425 OPERATING LICENSE NPF-68 CONSTRUCTION PERMIT CPPR-109 TACS 65955/65956 RESPONSE TO NRC BULLETIN 88-01 "DEFECTS IN HESTINGHOUSE CIRCUIT BREAKERS" In this enclosure, Georgia Power Company (GPC) presents its response to NRC Bulletin 88-01, "Defects in Hestinghouse Circuit Breakers", for Plants Hatch and Vogtle.

The Bulletin requires a determination of the number and Class 1E use of five specific breaker models (Hestinghouse CS-206 DSL-206,05-416, DSL-416, and DS-420).

If the breakers are found, the Bulletin requires short and long term inspection snd reporting of the inspection results.

If none of the referenced breake.s are found, then the Bulletin requires an affidavit to that fact.

It is our understanding that subject replacement breakers or parts from Hestinghouse require a certificate of compliance with this Bulletin.

PLANT HATCH There are no Hestinghouse model DS-206, DSL-206, DS-416, DSL-416, or DS-420 breakers in Class 1E circuits at Plant Hatch.

This completes the requirements for the subject Bulletin for Plant Hatch.

PLANT V0GTLE UNIT 1 There are eight of the subject breakers in the following uses at Plant Vogtle Unit 1:

two Reactor Trip Breakers (RTBs), two Reactor Trip Bypass Breakers, two Motor-Generator Ground Control Circuits (non-lE application), and two spares.

All of these breakers are model DS-416.

The subsequent discussion for this unit will refer only to the six Class IE breakers.

These breakers were examined under the criteria of the Hestinghouse September 11, 1987 Service Advisory Letter (SAL) on October 16, 1987, during a maintenance outage.

The SAL criteria had been incorporated into Maintenance Procedure 27765-C, Pev 9

"Hestinghouse Type DS 416 Circuit Breaker Maintenance".

The inspection results are maintained for the installed Class lE breakers only.

At the time of the SAL inspections, there was no observed mechanical misalignment.

However, one of the main pole shaf ts (RTB "B") failed the inspection and was removed from service.

Although RTB "B"

passed the acceptance criteria of the SAL, it was rejected by GPC based on a lack of fusion across the weld fillet near the center of its length.

'It is believed that this pole shaft would not have passed the criteria of the Bulletin.

Upon rejection, the entire breaker was replaced with an inspected Class IE spare and Hestinghouse was contacted to obtain a replacement shaft.

The replacement was received in January 1988.

0887U E-1 04/07/83 SL-4446 P00775

GeorgiaPower d ENCLOSURE (continued) l

~

"DEFECTS IN HESTINGHOUSE CIRCUIT BREAKERS" The SAL was incorporated verbatim into Westinghouse Technical Bulletin NSID-TB-87-11.

The Westinghouse Technical Bulletin was in turn embodied into the NRC Bulletin 88-01'.

While evaluating the SAL inspections against the requirements of the NRC Bulletin, it became apparent that the additional weld inspection criterion for porosity imposed by Bulletin 88-01 mandated reinspection of the main pole shafts.

Although porosity / surface indications are an inherent part of visual weld inspections, the specifk criterion was not reflected in Procedure 27765-C, Rev.

9, and

was, therefore, not previously documented.

Procedure 27765-C has been revised to include the NRC Bulletin's visual weld inspection acceptance criterion.

The short and long term inspections in accordance with Bulletin 88-01 were combined and conducted March 5 through March 10, 1988, for Class 1E breakers while the unit was at 100% power.

One pole shaft (Bypass "B")

failed the inspection for excessive porosity in terms of the NRC Bulletin's requirements.

The breaker was removed from service.

There were no mechanical misalignments.

The failure of the pole shaft on Bypass "B"

was not detected on the previous inspection because of the lack of a specific porosity criterion.

A replacement is on order from Westinghouse.

When it is received, the breaker will be inspected and retained as a spare.

These actions complete the requirements of the subject Bulletin for Plant Vogtle Unit 1.

PLANT V0GTLE UNIT 2 There are six of the subject breakers in the following uses at Plant Vogtle Unit 2:

two RTBs, two Reactor Trip Bypass Breakers, and two Motor-Generator Ground Control Circuits (non-1E application).

All of these breakers are model DS-416.

The subject inspections will be completed for the four Class 1E applications prior to fuel load (expected in early 1989).

The inspection results are expected to be forwarded to the NRC within 30 days of completion.

ADDITIONAL INFORMATION The NRC requested additional information to evaluate the cost of complying with Bulletin 88-01 in the following areas:

(1) "staff time to perform requested inspections, corrective actions, and associated operability testing:"

During an inspection performed in October 1987, Plant Vogtle personnel expended approximately 148 manhours among Maintenance, Engineering, Quality Control, and Operations.

This does not include the time of the NRC or Westinghouse personnel who also witnessed the inspections.

0887U E-2 04/07/88 SL-4446 700776

GeorgiaPower d ENCLOSURE (continued)

"DEFECTS IN HESTINGHOUSE CIRCUIT BREAKERS" During the inspection in March 1988, Plant Vogtle personnel expended approximately 171 manhours among Maintenance, Engineering, Quality Control Operations, and Nuclear Safety and Compliance.

This does not include the time to replace the pole shaft.

No significant costs were incurred for Plant Hatch.

(2) "staff time to prepare requested documentation":

A total of 80 manhours has been expended in preparing the requested documentation.

This time is divided among Plants Vogtle and Hatch Nuclear Safety and Compliance groups and the corporate office Engineering and Nuclear Safety and Licensing groups.

(3) "additional cost incurred as a result of the inspection findings (e.g.,

costs of corrective actions, costs of downtime)":

There is no easy determination of inspection cost for the October inspections.

For the March inspections, there was no "downtime" cost as the inspections were performed at power.

The replacement pole shafts are being provided to GPC at no charge by Westinghouse.

No significant costs were incurred for Plant Hatch.

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