ML17296B050

Final Rept of Deficiency Re Possible Inadvertent Defeat of Mechanical Interlock Device on Battery Charger Cabinet Which Could Close Both Breakers.Power Conversion Products Provided Design Fix Which Will Be Incorporated Prior to Startup

ML17296B050
Person / Time
Site:	Palo Verde
Issue date:	11/05/1980
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Spencer G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, ANPP-16692-BSK, NUDOCS 8011170570
Download: ML17296B050 (8)

Text

REGUL'ATORINFORNAT ION DISTRIBUTION +TEN (RIBS)

ACCESSION NBR!8011170570 DOC ~ DATE: 80/11/OS 'OTARIZED: NO DOCKET FACIL;STN 50-528 Palo Verde Nuclear Station~ Unit 1F Arizona Publi 05000528 AUTH ~ NAME AUTHOR AFFIL'I ATION VAN BRUNT<E.E, Arizona Public Service Co,. y~ 1 RECIP ~ NAME RECIPIENT AFFILIATION SPENCERFG,ST Region SF San Franciscoi Reactor Construction L Engineer

SUBJECT:

Final rept of deficiency re possible inadvertent defeat of mechanical interlock device on battery charger cabinet which could close both breakers'ower Conversion Products provided design fix which will be incorporated prior to startup.

DISTRIBUTION CODE: 8019S TITLE: Construction COPIES RECEIVED:LTR Deficiency Report (10CFRSO ~

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NOTES:Standardized Plant. 05000528 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL ACTION: A/D LICENSNG 04 1 1 MIRAGLZAeF s. 05 1 LEEFJ, 06 1 KERRIGANs J ~ 07 1 INTERNALi~ AD/RC I/IE 17 1 1 AEOD 18 1 ASLBP/J ~ HARD 1 1 D/DIR HUM FAC15 1 1 EDO L STAFF 19 1 EQUIP QUAL: BR11 1 1 HYD/GEO BR 22 1 1 I8E 09 1 1 LIC QUAL'R 12 1 1 MPA 20 1 1 NRC PDR 02 1 1 OELD 21 1 14 PROC FILE'1 S

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November 5, 1980 ANPP-16692-BSK/JAR> . g rf a:zCU '~~@

U. S. Nuclear Regulatory Commission C)

Region V 0 fgPCI/

Walnut Creek Plaza Suite 202 1990 North California Boulevard (

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@R Walnut Creek, California 94596 fT7

'CA Attention: Mr. G. S. Spencer, Chief Reactor Construction and Engzneerzng Support Branch

Subject:

A 50.55(e) Reportable Condition Relating to the Mechanical Interlock Device on the 48/125 Volt DC Battery Charger Cabinet Supplied by Power Conversion Products Final Report File: 80-019-026

Reference:

. (1) Telephone Conversation between J. Eckhardt and J. E. Cook on October 23, 1980 (DER 80-31)

Dear Sir:

Attached, is our final written report of the reportable deficiency, under 10CFR50.55(e), referenced above.

Very truly yours C':

(. Q, Qig E. E. Van Brunt, Jr.

APS Vice President Nuclear Projects ANPP Project Director EEVBJr/BSK:skc Attachment

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U. S. Nuclear Regulatory Commission Attention: Mr. G. S. Spencer, Chief ANPP-16692-BSK/JAR November 5, 1980 Page 2 CC Victor Stello, Jr: ., Director=-

0'f'fice of 'Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 A. C. Gehr Snell 6 Wilmer R. L. Robb D. B. Fasnacht W. E. Ide A. C. Rogers J. M. Allen J. A. Brand W. H. Wilson W. G. Bingham W. J. Stubblefield R. L. Patterson R. W. Welcher D. R. Hawkinson

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FINAL REPORT REPORTABLE DEFICIENCY 50.55(e)

ARIZONA PUBLIC SERVICE COMPANY (APS)

PVNGS UNIT /fl I. Descri tion of Deficienc It is possible to inadvertently defeat the mechanical interlock device on the battery charger cabinet, Tag No. 1-E-PKA-H15, and close both breakers at the same time. This condition is due to lack of rigidity of the interlock device. The deficiency was discovered during a routine review of jobsite conditions by Bechtel Management.

The specification (13-EM-051) for the safety-related battery chargers requires that the output circuit breakers in the battery charger be mechanically inter-locked to:prevent both breakers from being closed simultaneously. The breakers shall offer the possi-bility to be either both open or one closed and one open at any time.

II. Anal sis of Safet Im lications This condition is considered reportable based on the following considerations:

e If both circuit breakers are closed, the system is reduced to single mode failure in violation of IEEE and licensing re-quirements.

o The supplier, Power Conversion Products, recognized the condition and has provided an improved design for the Units 2 and 3 battery chargers. This design increases the rigidity of the mechanical interlock device so that both breakers cannot be inadvertently closed.

III. Corrective Action The necessary action to implement the supplier provided design fbi'illbe incorporated in Unit following 1

established field change procedures prior to system start-up. Design Change Package (DCP) ICE-PK-012, has

'een issued for this purpose.

The Power Conversation Products representative has indicated that this condition is isolated to the above identified battery charger.

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