ML20071N531

Interim Deficiency Rept DER 83-15 Re ASTM A354 Anchor Bolt Supplied by Marathon Steel Breaking Under Installation Torque After Test Acceptance.Initially Reported on 830318. Alternate Column Base Anchoring Detail Will Be Installed

ML20071N531
Person / Time
Site:	Palo Verde
Issue date:	05/24/1983
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Sternberg D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20071N533	List: ML20071N531 ML20071N542
References
10CFR-050.55E, 10CFR-50.55E, ANPP-23867-BSK, DER-83-15, NUDOCS 8306070104
Download: ML20071N531 (5)

Text

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Arizona Public Service Compan P.O BOX 21666 . PHOENIX ARIZONA 85036 !

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May 24,198}

ANPP-23867-BhIkhf!~Ji U. S. Nuclear Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, CA 94596-5368 Attention: Mr. D. M. Sternberg, Chief Reactor Projects Branch 1

Subject:

Interim Report - DER 83-15 A 50.55(e) Potentially Reportable Deficiency Relating to A354 Anchor Bolt From Marathon Broke Under Inst allation Torque After Test Acceptance File: 83-019-026; D.4.33.2 Re fere nc e: Telephone Conversation between P. Narbut and R. Tucker on March 18, 1983

Dear Sir:

The NRC was notified of a potentially reportable deficiency in the referenced telephone conversation. At that time, it was estimated that a determination 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 July 21, 1983, at which time a complete report will be submitted.

Very truly y rs, 2 -

E. E. Van Brunt, Jr. - (-

APS Vice President Nuclear Projects Management ANPP Project Director EEVB/RQT:db Attachment cc: See Page 2 8306070104 830524 PDR ADOCK 05000529 s eda yy sg,

U. S. Nuclear Regulatory Commission Page 2 cc: Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 T. G. Woods, Jr.

G. C. Andognini J. A. Roedel D. B. Fasnacht A. C. Rogers B. S. Kaplan W. E. Ide J. Vorees J. R. Bynum

, P. P. Klute/D. D. Green A. C. Gehr W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher R. M. Grant D. R. Hawkinson L. E. Vorderbrueggen G. A. Fiorelli Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway - Suite 1500 i Atlanta, Georgia 30339 i

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INTERIM REPORT - DER 83-15 POTENTIAL REPORTABLE DEFICIENCY ARIZONA PUBLIC SERVICE COMPANY (APS)

PVNGS UNIT 2 I. POTENTIAL PROBLEM During verification of installation torque of Column 9 anchor studs in Unit 2 Containment-Building, a 1" diameter ASTM A354 Grade BD anchor stud supplied by Marathon Steel broke in the threaded portion (Drawing 13-C-ZCS-620 embed no. 322, bolt D). The stud has a documented EQUOTIP Hardness of L=578(Rockwell C=31)and the specified installation torque is 1,071 ft.-lbs.

A complete failure analysis was performed on the broken portion of the subject stud by Bechtel'c Material and Quality Services (M&QS)

Department. Based upon the results of this analysis, it has been determined that (see M&QS Technical Report No. 0383-03 FA, BLN No. 283-13, dated March, 1983): 1) the stud's chemical content and hardness are consistent with the requirements of ASTM A354 Grade BD; 2) the stud had an acceptable quenched and tempered microstructure; 3) it experienced a torsional failure due to ductile shear overload The report concludes that the anchor-stud was overtorqued.

An engineering review of this condition has limited the problem to the identified Column 9 embedded studs as follows:

a) There is evidence of overtorquing on other studs which secure Column 9.

b) The other identical installations (Column 10 of Unit 2 and Columns 9 and 10 of Unit 3) have been verified to be torqued to the specified values with no problems.

c) The torque wrench used for this particular installation has been checked and found to be within calibration requirements.

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! II. APPROACH TO AND STATUS OF PROPOSED RESOLUTION Column 9 serves as a pipe whip restraint in the event of a Main Steam System break. Should the subject condition remain uncorrected, Column 9 could potentially be unable to perform this safety-related function.

Page 2 Bechtel Engineering is currently finalizing an alternate column base anchoring detail which will utilize side straps and core-drilled through-bolts in lieu of the embedded anchor studs. NCR CC-3993 will be dispositioned to repair the defect by installing this

. alternate anchoring detail.

III. PROJECTED COMPLETION OF CORRECTIVE ACTION AND SUBMITTAL OF THE FINAL REPORT Evaluation of-this' condition and submittal of the Final Report is forecast to be completed. by July 21, 1983.

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A ENT TO DER 83-15ecatel Group, Inc.

3ACHF Interoffice Memorandum l

To R. A. Keldel Fee No. GRS-033-09 subrect Failure Analysis of an Date March 17, 1983 ASTM A-354 Bolt Palo Verde Project From G. R. Schmidt Job No. 10407-002 of R&E/ Materials & Quality R. A. Manley/B. D. Hackney (6) Servi es Department N. H. Evans  ! ! '

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C. Dunn DCC 131177/Proj. File J. E. Drennan/BLN-283-13-SF BLN-283-13-WC Transmitted with this IOM are six copies of a report covering our examination of a fractured bolt.

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G. R. Schmidt

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GRS/JCG/nlj Attachment I

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