ML20040F373

Final Deficiency Rept Re Out of Calibr Torque Wrenches.All Seismic Category 1 Drilled in Concrete Anchors Installed by 215 Contractor Will Be Retorqued & Identified by Torque Point

ML20040F373
Person / Time
Site:	Columbia
Issue date:	01/26/1982
From:	Matlock R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, GO2-82-111, NUDOCS 8202090127
Download: ML20040F373 (3)

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Docket No. 50-397

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Washington Public Power Supply System P.O. Box 968 3000 GeorgeWashingtonWay Richland, Washington 9935'2cN(ifQ5})17 -5000 Docket No. 50-397 2'6 3 7C,'i g, ..

January 26, 1982 G02-82-Ill

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'Mr. R. H. Engelken

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U.S. Nuclear Regulatory Commission E Region V -

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1450 Maria Lane, Suite 210 E r.mue ram ness T Walnut Creek, California 94596

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Subject:

NUCLEAR PROJECT 2 ~ N 100FR50.55(e) POTENTIALLY REPORTABLE CONDITION #98 i

OUT OF CALIBRATION TORQUE WRENCHES In accordance with the provisions of 10CFR50.55(e), your office.

was informed of a potentially reportable condition regarding torque wrenches which were used and subsequently found to be out of cali-bration. Attached is our final report on this subject.

Should you have any questions regarding this letter, please contact R. T. Johnson at (509) 377-2501, extension 2712.

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. Matlock WN -2 Program Director RLH/kd

Attachment:

Final Report cc: W.S. Chin, BPA - Site R.A. Feil, NRC Resident Inspector - WNP-2 A. Forrest, Burns and Roe - HAPO N.D. Lewis, NRC J. Plunkett, NUS Corp.

R.E. Snaith, Burns and Roe NY V. Stello, NRC EDC WNP-2 Files f

6 8202090127 820126 PDR ADOCK 05000397 O PDR

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t FINAL REPORT WASHINGTON PUBLIC POWER SUPPLY SYSTEM DOCKET N0. 50-397 LICENSE NO. CPPR-93 10CFR50.55(e) REPORTABLE CONDITION N0. 98 OUT OF CALIBRATION TORQUE WRENCHES DESCRIPTION OF DEFECT OR NON-COMPLIANCE It has been determined that prior to the institution of daily calibration checks in January,1980 a number of the torque wrenches used by the 215 Contractor exceeded the permissible calibration tolerance. In our August 14, 1981 update report (Letter No. G02-81-0242) this deficiency was deemed reportable under 10CFR 50.55(e) on the basis that drilled in concrete anchors supporting some safety related systems may not have been properly torqued and that a major sampling plan would be required to determine the acceptability of the installed bolts.

APPROACH TO RESOLUTION OF THE PROBLEM In our November 19, 1981 interim report (Letter No. G02-81-0480) the Supply System identified a number of near term activities leading to the selection of the preferred approach to resolve the out-of-calibration torque wrench problem. The results of these activities are described below.

Based on these results we plan to retorque all Seismic Category I drilled in concrete anchors installed by the 215 Contractor and apply torque paint to each anchor to identify that it has been satisfactorily retorqued.

The review of the Contract 215 concrete anchor installation / rework programs and torque wrench calibration data is complete. The review indicated that none of the wrenches used in the period February 1978 to January 1980 were out of calibration far enough to represent a threat to the mechanical integrity of the anchor or anchor bolt, although in some cases tney would have led to inadequate or excessive preload on the anchor. Calibration records prior to February 1978 were not reviewed on the basis that all large bore hangers installed prior to February 1978 were subject to the anchor retrofit program which included inspection, rework as required and retorquing, and that few small bore hangers had been installed prior to February 1978. Since a review of the period covering the majority of the installations where out of calibration wrenches may have been used has not indicated a significant potential for mechanical damage due to over-torque and the proposed retorquing would detect a failed anchor by its inability to achieve the proper torque value, further review of these records is not required.

An evaluation was performed of the feasibility of a direct rework or sampling approach to demonstrate the acceptability of the installed anchors.

While it was possible to trace a sample of torque wrenches to the pipe supports on which they were used, the effort required for the documentation review was comparable to retorquing all the bolts in question. The proposed apprcach was selected on the basis that it was a simpler and more effective solution in that it eliminated the need for further documentation reviews and provided positive evidence that all Seismic Category I drilled in anchors had been properly torqued (torque paint).

Any anchors that do not achieve their proper torque will be documented but not painted until the deficiency has been dispcsitioned and reworked if required.

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Final Report Page Two 4 STATUS OF PROPOSED RESOLUTION The Supply System has directed our Construction Manager to proceed with the retorquing of all Seismic Category I drilled in concrete anchors installed by the 215 Contractor. The work is to be scheduled on a system basis in accordance with the'overall project schedule.

PROJECTED COMPLETION OF CORRECTIVE ACTION 5

The retorquing will be completed on a system basis. It is expected that all the retorquing will be completed by 90 days prior to fuel load. <

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