ML17297A378

Final Deficiency Rept Re Cracked Turnbuckle Assembly Rods Supplied for Control Room Lighting Suspension Sys,Initially Reported in P Norbut 810325 Telcon.Rods Returned to Manufacturer for Disposal

ML17297A378
Person / Time
Site:	Palo Verde
Issue date:	04/15/1981
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-17786-BSK, NUDOCS 8104270330
Download: ML17297A378 (12)

Text

REGUlQORY 1NFORMATION DISTRIBUTE>> SYSTEM (RIBS)

ACCESSION NBR 8100270330 DOC ~ DATE: 81/00/15 NOTARIZED: NO DOCKET ¹ BYNAME50 528 Palo Verde Nucl ear FACIL.:STN AFFILIATION StationE Unit li Ar i zona Publ i 05000528 AUTH AUTHOR VAN BRUNT~E,E. Arizona Pub)ic Service Co.

RECIP ~ NAME" .RECIPIENT AFFILIATION Reactor Construction Ehgineer SPENCERFG ~ ~ ~ Region 5< San Francisco~ &

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SUBJECT:

Final deficiency rept reY cracked turnbuckle assembly rods supplied for- control>> room lighting suspension sys<intially reported in P Norbut 810325 telcon ~ Rods- returned to manufacturer. for SIZE:.

disposal'ISTRIBUTION CODE: B019S COPIES RECEIVED:LTR L ENCL J A>>>>

TITLE: Constr uction Deficiency Repor t. (10CFRSO.'55E)

NOTES:Standardized Plant F 1 cy.'C Grimes 05000528 REC IPIENT COPIES RECIPIENT COPIES Ib CODE/NAME, f TTR ENCL>> ID CODE/NAME LTTR ENCL ACTION: A/O LICENSNG OQ 1 1 LIC BR 03 BC 05 1 1 LIC BR ¹3 LA 06 l.- 1 KERRIGANFJB 07 1 1 INTERNAL> ASLBP/J.HARD 1 1 0/DIR HUM FAC15 1 1 EDO 8 STAFF 19 1 1 EQUIP QUAL BR11 1 1

'i HYO/GEO BR 22, 1 1 I&E 09 1 1 IE/EES 1 LIC QUAL>> BR 12 1 1 MPA 20 1 1 NRC POR 02 i OELD 21" 1 1 P - 'EV 13 1 1 QA BR 1. 1 EG FI 1 RUTHERFOROgN ~ IE, 1 1 RDS DE V 21 1 EXTERNAL: ACRS 16 16 16 LPDR 03 1 1 NSIC 08 1 1 gp~g B>>t I98Y gq TOTAL NUMBER OF COPIES REQUIRED: LTTR ENCL 1

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21666 April 15, 0

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'HOENIX, ARIZONA 66036 1981 ANPP-17766-BSK/JAR g$~/P,

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U. S. Nuclear Regulatory Commission +I Ra Region V walnut Creek Plaza - Suite 202 4/

1990 North California Boulevard /Cv walnut Creek, California 94596 Attenti on: Mr. G. S. Spencer, Chief Reactor Construction and Engineering Support Branch

Subject:

Final Report A 50.55(e) Reportable Condition Relating to Cracked Turn-buckle Assemblies Supplied for the Suspension System for the Control Room Lighting File: 81-019-026; D.4.33.2

Reference:

Telephone Conversation between P. Norbut and B. S. Kaplan on March 25, 1981, (DER 81-6)

Dear Sir:

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

Very truly yours, 6 (.l7~

E. E. Van Brunt, Jr.

APS Vice President, Nuclear Projects ANPP Project Director lb Attachments cc: (see attached) 77,63/ I i((

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0 U. S. Nuclear Regulatory Commission ANPP-17786-BSK/JAR Page 2 April 15, 1981 cc::-Victor Stel-lo ,Jr;;Director, Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 A. C. Gehr Snell 5 Wilmer R. L. Robb D. B. Fasnacht W. E. Ide J. H. Allen A. C. Rogers 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)

PVWCiS UNIT 1 I. Descri ti on of Defi ci enc Cracks were discovered in the 90o bends of the 1/4" diameter threaded, steel rods which are part of the hanging system hardware for the lighting fixtures of the control room ceiling supplied by the Day-Brite Lighting Division of Emerson Electric Co., Tupelo, t1ississippi. These rods

( Item 15 B77X141) are used to provide lateral support to the light fixtures and are an integral part. of the ceiling support system. The cracks origi-nated at the manufacturer's shop due to improper cold bending of the rods.

Cracks were not detected 'by the supplier prior to delivery; however, the deficiency was discovered by Bechtel Construction prior to installation.

Eighty-four (84) pieces were found with cracks at the bend out of a total of one hundred and forty-six (146) pieces received for Unit 1 ceiling.

The rods are an integral part of the ceiling support system. Four rods are used in combination with turn buckles, clevises, and vertical hanging rods to provide the hanging system for each light fixture. This support system has been qualified under seismic conditions. As such, if any of the defective lateral support rods were to be installed, it could potentially weaken the overall fixture support and may cause the fixture to become disengaged and fall during a seismic event. Other safety features, such as secondary hangers are incorporated into the design to minimize this eventuali.y, however, the defective rods represent a condition which has not been analyzed and which has not been qualified by testing.

II. Anal sis of Safet Im lication

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This condition is considered reportable under the requirements of 10CFR50.55(e) since if left uncorrected the failure of the control room lighting fixture support system, as indicated above, could possibly cause failure or loss of safety related control room functions.

APS has no knowledge of any of these components that may have been supplied to other facilities.

III. Corrective Action The defective rods have been returned to the manufacturer for disposal and

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III. Corrective Action (continued) all other rods included in this shipment will be disposed of at the jobsite. New rods will be made using improved manufacturing techniques to preclude recurrence of this deficiency (see attached letter, Oay-Brite to Bechtel Power Corporation dated 3/25/81). Also a Bechtel Supplier guality Representative will be assigned to this order to provide additional surveillance prior to reshipment of the rods.

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Attach t to DER 81-6 March 25,1981 Bechtel Power Corporatj:on P.O. Box 60860 Terminal Annex Los Angeles, California 90060 Attention: Nilliam Currlin RE: Arizona Nuclear Power Project Bechtel Job 10407 Purchase Order 10407-13-AM-216 1/4-20 Threaded Rod with 90 degree bend for Control Room Ceilin

Dear Bill:

The subject rod when used as part of the diagonal brace from near the top of the module gussett plat to the Grinnel strap at the beam is heated (annealed) and put in a die for 90 degree bending.

After the rod has been bent it is plated.

Stress testing on a random selection basis occurs twice, after bending and after plating. The minimum failure has occurred at 1300 Ft. lbs.

A visual inspection for cracks is made on each rod prior to plating.

Yours truly, 1 Vg,~q Robert Mosier, Technical Marketing Manager I-"MI=R5ON '

DAY BRITE LIGHTING DIVISION c=SO . ci cCTR:>> CQ

'3 6 S GI',""c':S S. Ryan PO 0~A."S~ 68 TUP"" LO !.'ISS~SS~I'I'>

388'J'c: T. Halfaker 005dRMS

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