ML20005A458

Interim Deficiency Rept Re Mating Forces of 125 Volt Dc Control Power Fuse Blocks Decreases After Several Insertions & Removals of pull-out Fuse Blocks,Initially Reported 810521.Bechtel Requested Assistance from Gould-Brown-Boveri

ML20005A458
Person / Time
Site:	Palo Verde
Issue date:	06/18/1981
From:	Van Brunt E, Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Faulkenberry B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, ANPP-18237-BSK, NUDOCS 8106300355
Download: ML20005A458 (3)

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1 P. oL SOM 21666 -

PHOCN6X. ARIZON A 85036 June 18, 1981 .- ,w ANPP-18237-BSK/JARgP~~ '

- g/ r.T 1 i* 1 U. S. Nuclear Conunisaion [' *d Region V y; ] 9 $31 > .',

Walnut Creek Plaza - Suite 202 .c a .c:u 1990 North California Boulevard e.tara ,

Walnut Creek, California 94596 g A(t/ / 3 Attention: Mr. B.11. Faulkenberry, Chief s Reactor Construction and Engineering Support Branch

Subject:

Interim Report A 50.55(e) Potet- tily Reportable Deficj%cy Relating to the Mating Forces of the 125V DC Control Power Fuse Blocks Decreases After Several Insertions and Removals of the Pull-Out Fuse Blocks File: 81-019-026 D.4.33.2

Reference:

Telephone Conversation between J. Eckhardt and B. S. Kaplan on May 21, 1981 (DER 81-12)

Dear Sir:

The NRC was notified of a potentially reportable deficiency in the referenced telephone conversation. At that time, it was estimated that a detemination of reportability would be made within thirty (30) days.

Due to the extensive investigation and evaluation required, an interim report is attached. It is now expected that this information will be finalized by December 15, 1981, at which time a complete report vill be submitted.

Very truly y urs

, e CQLk Il'Q E. E. Van Brunt, Jr. d APS Vice President Nuclear Projects ANPP Project Director EEVBJr/BSK:ske g

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Attachment 8106 30 03 5 g .3

U. S. Nuclear Regulatory Commission Region V Attention: Mr. B.11. Faulkenberry ANPP-18237-BSK/ JAR June 18, 1981 Page 2 cc:

Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 A. C. Gehr Snell & Wilmer R. L. Robb D. B. Fasnacht W. E. Ide J. M. Allen A. C. Rogers J. A. Brand W. II. Wilson W. G. Bingham W. J. Stubblefield R. L. Patterson R. W. Welcher D. R. llawkinson ,

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i INTERIM REPORT POTENTIAL REPORTABLE DEFICIENCY ARIZONA PUBLIC SERVICE COMPANY (APS)

PVNGS UNIT #1

1. Potential Problem The pull-cut fuse blocks manufactured by Bulldog Electrical Products, Incorporated and supplied as a component of the 480V Load Centers from Gould-Brown-Boveri were found to have a substantial reduction in the mating force requirement after several insertions and removals.

This condition was raised as a concern by the project start-up group because there exists a question as to whether the copper female clips provided with the fuse block are capable of per-forming their safety-related function of maintaining contact after many removals and insertions of the fuse blocks during the life of the plant.

II. Approach To and Status Of Proposed Resolution Bechtel has requested assistance from Gould-Brown-Boveri in

. reviewing, evaluating and dispositioning this condition. .

III. Proiected Completion of Corrective Action and So.mittal Date of the Final Rc7 ort The evaluation, resolution snd final report are forecast to be completed by December 15, 1981.

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