ML17275A818

Interim Deficiency Rept Re Sway Brace Bracket Failures, Initially Reported 800820.Caused by Poor Weld Quality,Lack of Fusion & Undersized Welds.Testing Will Resume After Design & Fabrication of New Test Fixtures for Revised Angle

ML17275A818
Person / Time
Site:	Columbia
Issue date:	02/05/1981
From:	Matlock R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, G2-81-19, GO2-81-19, NUDOCS 8102120001
Download: ML17275A818 (5)

Text

REGULA Y INFORMATION DISTRIBUTIL SYSTEM (RIDS)

ACCESSION NBR: 8102120001 DOC ~ DATE: 81/02/05 NOTARIZED:

NO DOCKET FACIL:50-397 WPPSS Nuclear ProJectg Unit 2i Washington Public Powe 05000397 AUTH ~ NAME AUTHOR AFFILIATION MATLOCKPR,G, Washington Public Power Supply System REC IP ~ NAME RECIPIENT AFFILIATION

(

ENGELKENgRRHB Region Si San Francisco'ffice of the Director

SUBJECT:

Interim rept re sway brace bracket failuresiinitial)y reported 800820,Caused by poor weld qualityilack of fusion 8

undersized welds.Testing will resume pending design 8

fabrication of now test fixtures for revised. test angle.

DISTRIBUTION CODE:

BOIOS COPIES RECEIVED:LTR

~ENCI. ~

SIZE:

TITLE: Construction Deficiency Repor t (10CFR50

~ 55E)

NOTES:PM:

2 copies of all material

~

05000397 RECIPIENT ID CODE/NAME AC T'I 0 N ~

A/ D L'IC E N S N G 0

1 RUSHBROOKPM, 06'NTERNAL:

AD/RCI/IE 17 D/DIR HUM FAC15.

EDO a

STAFF 19 HYD/GEO BR 22" LIC QUAl. BR 12 NRC-PDR 02 P

REV 13 FILE Ol V 21 COPIES LTTR ENCL RECIPIENT ID CODE/NAME YOUNGBLOODPB 05 LYNCHgDB 07 ASLBP/J ~ HARD DIRgDIV OF LIC EQUIP QUAL BR11 laE 09 MPA 20 OELD 21 QA BR fg RUTHERFORDgW ~ IE COPIES LTTR ENC 1

1 1

1 1

1 1

1 1

1 1

EXTERNAL: ACRS NSIC 16 08 16 1

1 1

LPDR 03 1

1

'fj TOTAL NUMBER OF COPIES REQUIRED:

LTTR

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0 Washington Public Power Supply System A JOINT OPERATING AGENCY P.O. BOX 968 3000 GEO. WASHINGTON WAY RICHLANO,WASHINGTON 99352 PHONE (509) 372.5000 February 5, 1981 G02-81'-19 Docket No. 50-397 Nuclear Regulatory Commission Region V

Suite 202, Walnut Creek-Plaza 1990 North California. Boulevard Walnut Creek, California 94596 Attention:

Nr. R.

H.. Engelken, Director Gentlemen:

Subject:

WPPSS NUCLEAR PROJECT NO.

2 REPORTABLE DEFICIENCY - 10CFR50.55(e)

SWAY BRACE BRACKETS

References:

(a) Telecon, gA2-80-309, dated 8/20/80

Subject:

. Notification of Reportable 10CFR50.55(e)

Condition (b) G02-80-208, dated 9/19/80'ubject:

Reportable Deficiency (c) G02-80-271, dated ll/26/80

Subject:

Reportable Deficiency Your staff has been notified and kept abreast of the progress of our ev'aluation of the reportable 10CFR5055(e) condition relating to sway brace brackets per references (a) through (c)..

The following update is submitted for your information.

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S

,/o The testing of the sway brace brackets, size. 15, 25 and 40, coIImenced on January 22, 1981.

The. limited destructive testing completed to date, at the calculated most critical angle, has had only limited success.

Failures, below proof load, have occurred on all size brackets tested.

As expected the fai-lures occurred as a result of poor weld quality i.e.

lack of fusion and undersized welds.

Although the program has not been completed or fully evaluated, it appears that we do not have a significant failure -Tate with the size 15 brackets, that we do have a significant failure rate with the size 40 bracket, and that no judgement can be made at this time regarding the size 25'racket.

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WASHINGTON PUBLIC POWER SUPPLY SYSTEM Docket No. 50-397 Based upon the limited destructive testing conducted to *date, it has become prudent to stop the testing of the brackets at the calculated most critical angle and to resume testing at some lesser angle which will be more representative of our design and installations.

.Testing at this lesser angle will permit acceptance of the brackets by limiting the angles at which they may be utilized and/or by derating allowable loads.

This is compatible with our original approach per reference (c).

The test program will resume as soon as we can design and fabricate new test fixtures to accommodate the revised test angle.

A follow-up or final report, as'ppropriate, will be submitted by April 30, 1981.

Very truly yours, RGM/RPS/ib Attachment as stated cc:

WS Chin - BPA ND Lewis - EFSEC, Olympia, RE Snaith - B8R, NY V~tel 1 o~NRC gi'~+Ac:-AP R

G.

MATLOCK Program Director, WNP-2 AD Toth -

NRC Site JJ Verderber - B&R, NY E.

Wood -

NUS Corporation WNP-2 Files