ML20038C809

First Revised Interim Deficiency Rept Re Mating Force of 125-volt Dc pull-out Fuse Blocks Decreasing After Several Insertions & Removals,Initially Reported 810521.Fuse Block Samples Being Inspected.Final Rept by 820122

ML20038C809
Person / Time
Site:	Palo Verde
Issue date:	11/25/1981
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Faulkenberry B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, ANPP-19545-GHD, DER-81-12, NUDOCS 8112140148
Download: ML20038C809 (3)

Text

-

> Docket Nos. 50-528/529/530 a

w' f. 50 55(e) Report AL1RP W3A IP@mRD !sGdRFHDDd (DKEGERA?JW STA. P.o. Box 21666 - PHOENIX, ARIZONA 85036 November 25, 1981 ANPP-19545-GHD/BSK U. S. Nuclear Regulatory Commission .-

Region V

,M

/ [' 11L k, Creekside Oaks Office Park ',j 1450 Maria Lane - Suite 210 'y -

Walnut Creek, California 94596-5368  ? l{. y / '7/j7' , fa

~'

DEC Attention: Mr. B. H. Faulkenberry, Chief M

~'

l O 7 [%

Reactor Construction and ,% $

Engineering Support Branch ' 4 D 'Ott

Subject:

Interim Report, Revision 1 - DER 81-12 Y .' #

A 50.55(e) Potentially Reportable Deficiency R -

to Mating Force of 125V DC Pull-Out Fuse Blocks Decreases After Several Ir.sertions and Removals File: 81-019-026 D.4.33.2 Re ference : (A) Telephone Conversatien between J. Eckhardt and B. S. Kaplan on May 21, 1981 j

(B) ANPP-18237, dated June 18, 1981 (Interim Report)

Dear Sir:

l The NRC was notified of a potentially reportable deficiency in l

Reference (A) and an Interim Report was transmitted by Reference l (B). At that time, it was estimated that a Final Report would be available by December 15, 1981.

l Due to the extensive investigation and evaluation required, a revised Interim Report is attached. It is now expected that this information will be finalized by January 22, 1982, at which time a complete report will be submitted.

Very truly youra, (

RLt LLt E. E. Van Brunt, Jr.

l APS Vice President Nuclear 'Proj ec'Es!

ANPI Project Director EEVBJr/GHD:skc , , . l } g'j g ' j},] Uj N

Attachment i

L. L cc: See Attached Page 2 gfjg g l 8112140148 811125 PDR ADOCK 05000528 S PDR } } - ) ] b,

U. S. Nuclear Regulatory Conmission Attention: Mr. B. H. Faulkenberry, Chief ANPP-19545-GHD/BSE Novenber 25, 1931 Page 2 cc: Victor Stello, Jr., Directsr Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 J. A. Roedel D. B. Fasnacht G. C. Andognini F. W. Hartley J. M. Allen A. C. Rogers B. S. Kaplan W. E. Ide J. Vorees J. A. Brand A. C. Gehr W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher R. M. Grant D. R. Hawkinson L. E. Vorderbrueggen Ms. Patricia Lee liourihan 6413 South 26th Street Phoenix, Arizona 85040 rr---,e- - ,, - - - , - - - , a ~ , - , - - , - - . . - , , -

, , - - . ,g _n-, -- - .- -- - - , . - ,w..+,- , - , , ,, . . . - , - - ,.. - - . , -,, - , . ., ,, - -, . , , - - - -

INTERIM REPORT, REVISION 1 - DER 81-12 POTENTIAL REPORTABLE DEFICIENCY ARIZONA PUBLIC SERVICE COMPANY (APS)

PVNGS UNIT #1

1. Potential Problem The pull-out 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 performing 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.

Gould-Brown-Boveri is currently inspecting fuse block samples.

III. Projected Completion of Corrective Action and Submittal of the Final Report The evaluation, resolution and final report are forecast to be completed by January 22, 1982.

- _ _ . - _ . . . . .- . . - , . . - . . , . . , . . - . - - - ,- - - ... -_ - , - - . . . . _ .