ML20151Z050

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Rev 0 to Welding Project Employee Concern Evaluation Rept WP-13-BFN, Welding Equipment
ML20151Z050
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 04/06/1987
From: Lewis J, Pate B, Rose J
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20151Z000 List:
References
WP-13-BFN, WP-13-BFN-R, WP-13-BFN-R00, NUDOCS 8808290148
Download: ML20151Z050 (6)
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. WELDING PROJECT EMPLOYEE CONCERN EVALUATION REPORT WELDING EQUIPMENT PREPARED BY M* M/[7 WP/ECTG u

REVIEWED BY \ iP.  % bl/ (#fl, DNC/WP 4!n!o7 REVIEWED BY

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APPROVED BY a)ALLb Vk M- PROGRAM MANAGER N

FM Report Number WP-13-BFN Re ision 0 Date ~ /$ ~ 0 7 8808290148 880822 PDR ADOCK 050 g 9 P

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WP-13-BFN l Revision 0 EMPLOYEE CONCERN ,

1

SUMMARY

SHEET 1 WELDING EQUIPMENT AT BROWNS FERRY l

NUCLEAR PLANT I. SCOPE OF EVALUATION This report addresses two employee concerns dealing with the welding equipment used at Browns Ferry Nuclear Plant (BFN). These concerns were grouped into two issues to aid in the evaluation effort.

A. Welding machines do not have suitable amperage settings for welding with 3/32 inch diameter electrodes which leads to porosity and pinholes.

B. Welding machines should have remote switches to prevent tungsten inclusions.

II. ANALYSIS OF ISSUES ADDRESSED BY CONCERNS The issues addressed by this evaluation evolved from Watts Bar concerns that were applied to Browns Ferry for evaluation for generic '

implication.

A. One issue stated that the McKay and Hobart welding machines only provided a 50 and 100 amp setting which is unsuitable for welding with 3/32 inch diameter electrodes and contributes to porosity and pinholes. Browns ferry utilized the Lincoln Idealare TIG 300, K1312 which has a current output range of 2-375 amps in both AC and DC.

This issue is discussed in WP-13-BFN, Paragraph III A.

B. One issue stated that all welding machines should have remote switches for are starting to prevent tungsten inclusions. The Lincoln Idealarc TIG 300 has the remote switches for are starting and current control adjustment.

This issue is addressed in WP-13-BFN, Paragraph III B.

III. COLLECTIVE SIGNIFICANCE No collective significance was identified in that Browns Ferry did not utilize the welding machines addressed by the concerns.

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WP-13-BFN Revision 0 IV. ROOT CAUSE(S)

The root cause of the employee concerns in this area is the TVA decision to apply Watts Bar employee concerns to other nuclear sites for evaluation for generic implications.

V. CORRECTIVE ACTION No corrective action is indicated.

VI. REINSPECTION REQUIRED ._

No.

VII. ISSUE CLOSURE Closed.

VIII. ATTACHMENTS

1. Evaluation Report WP-13-BFN.

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(' WP-13-BFN Revision 0 p

WELDING PROJECT EMPLOYES CONCERN EVALUATION REPORT WELDING EQUIPMENT AT BROVNS FERRY i

NUCLEAR PLANT

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I. SCOPE OF EVALUATION This report addresses two employee concerns. Text of the concerns is provided Under Attachment 1.

The subject concerns originated at Watts Bar Nuclear Plant, and were generically applied to Browns Ferry Nuclear Plant (BFN). This evaluation is based on review of the BFN Welding Phase I Report, current and superseded process specifications and implementing procedures, and the Welding Project Report WP-13-SQN. Also reviewed were the BFN Corrective Action Reports, Discrepancy Report's, Nonconformance Reports, and the AEC/USNRC Inspection Reports. The Americen Society of Mechanical Engineers (ASME) Boiler and Pressure .

Vessel Code Section III and The USA Standard for Pressure Piping i B31.1.0 were reviewed for applicability to the text of the concerns.

The findings presented herein are based upon review of the above noted documents and interviews with cognizant TVA personnel.

II. ISSUES ADDRESSED BY CONCERNS A. Welding machines do not have suitable amperage settings for welding with 3/32 inch diameter electrodes which leads to porosity and pinholes.

B. Welding machines should have remote switches to prevent tungsten inclusions.

III. ANALYSIS OF ISSUES ADDRESSED ~BY CONCERNS A. One concern stated that welding machines (McKay and Hobart) used by steamfitters have only two settings, 50 and 100 amps, which are unsuitable for use with 3/32 inch diameter electrodes and that contributes to porosity and pinholes.

There is no mandated requirement for the type welding equipment to be used. The choice of particular types of welding equipment is based on overall management and engineering judgements relative to the type activities to be accomplished, space limitations, and equipment availability and suitability.

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WP-13-BFN Revision 0 Browns Ferry has, since beginning cor.straction, used Lincoln Idealarc TIG 300, K1312 Welding machines. These machines have a current output range of 2-375 amps in both AC and DC and have remote current adjustment controls. Both the GAS Tungsten Arc Welding (GTAW) and the Shielded Metal Arc Welding (SMAW) processes can be used with this equipment.

Welding equipment, normally grid banks and multiple operator units, with only a 50 and 100 amp range, not fixed, settings are suitable for use and are used throughout the industry and have a history of satisfactory performance. These machines do have fine current ._

adjustment features. Depending on the type, these machines can be adjusted in 2 1/2 or 5 amp increments. Each will produce current ranges required by the Browns Ferry Detail Weld Procedures. The use and capability of these machines are discussed in detail in Wold Project Report WP-13-SQN.

B. One concern stated that all welding machines should have remote switches for are starting to prevent tungsten inclusions in the weld.

The Lincoln Idealare TIG 300 used at Browns Ferry has the remote switch to assist in smooth are starting. A detailed discussion on prevention of tungsten inclusions, when using other types of welding machines, is included in the Weld Project Report VP-13-SQN.

IV. COLLECTIVE SIGNIFICANCE None. Browns Ferry did not use the types of welding equipment addressed by the issues. ,

V. ROOT CAUSE(S)

The reason for the employee concerns relating to welding equipment is the application of Watts Bar concerns to other TVA sites for evaluation for generic implications.

VI. CORRECTIVE ACTION 4

No corrective action is indicated.

VII. ATTACHMENTS

1. Employee concerns, f

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WP-13-BFN -

Revision 0 i WELDING PROJECT EMPLOYEE CONCERN EVALUATION REPORT ATTACHMENT 1 TEXT OF EMPLOYEE CONCERNS Evaluation Report WP-13-BFN addresses two employee concerns. The text of the .

concerns is shown on the following page.

IN-85-247-002 IN-85-303-001 I

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