ML20062D629
| ML20062D629 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 10/31/1978 |
| From: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| HOWE-223-78, NUDOCS 7811280124 | |
| Download: ML20062D629 (2) | |
Text
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n C' POW 0r ConSumBIS h (Q@%g{
Stephen H. Howell Senior Vice President General Officos: 1945 West Pernell Road, Jackson, Michigan 40201 e (517178844S3 October 31, 1978 Hove-223-78 g
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Mr J G Keppler, Regions'. Director 5 -
Office of Inspection and Enforcement
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US Nuclear Regulatory Commission Region III
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799 Roosevelt Road
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Glen Ellyn, IL 60137 UNSPECIFIED VOLTAGE IN BECHTEL WPS No P1-A-LH
Reference:
(1) NRC IE Inspection Report No 50-329/78-03andNo 50-330/78-03, dated May 4, 1978 (2) S H Howell letter to J G Keppler, Midland Nuclear Plant - NRC Items of Noncompliance, Inspection Report No 50-329/78-03 and No 50-330/78-o3, Serial Hove-89-78, dated June 7, 1978 (3) R F Heishman letter to S H Howell, Docket No 50-329 and 50-330, dated September 13, 1978 Reference (1) is the original NRC inspection report in which three issues
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vere raised, as follows:
(a) The need for specify..ng a velding voltage requirement.
(b) The need for measuring and recording the voltage actually used.
(c) The need for limiting the voltage value to within + 15 percent of the mean range value.
With regard to (a), Reference (2) stated that bf $eptember 1,1978 a voltage requirement would be given in the prequalified AWS velding procedure specifications. This was completed on August.h,1978 with the issuance of Revision 8 of Bechtel Specification 7220-G-27 With regard to icsue (b), commencing on or before December 1, 1978, a procedure vill be implemented to monitor the velding voltage ranges as listed in velding procedure specifications. This procedure vill identify the emperage and voltage measurements which vill be required. The frequency of the measurements to be taken vill be based on the number of certified velders at the site as determined by the velder qualification list.
W811280 M ey 2 1976
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2 Hove-223-78 i
The actual number of measurements to be made in a given month will be 5 percent of the number of velders from the previous month'a list.
Welding voltage and amperage vill be measured with a portable in-line ahunt and meter box temporarily installed in the velding electrode lead as close 4
as practical to the velding arc (normally, the first disconnect in the electrode lead upstream of the electrode holder). The voltage vill be determined by measuring the electrical potential between the velding electrode lead and the work piece or ground lead. Amperage vill'be determined by passing the velding current through a shunt and measuring the corresponding voltage drop with a millivolt meter calibrated to indicate corresponding amperage values.
CPCo intends to pursue, through national standards organizations and
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independent testing, a program to substantiate our position that measure-ment of voltage does not provide any additional assurance of velding quality.
With regard to issue (c), Reference (3) stated NRC's position that velding
"...be perfonned at values within + 15 percent." CPCo does not agree that the AWS Structural Welding Code Dl.1,1972 Edition (incitriing 1973 and 1974 revisions) requires limitation of the voltage range for prequalified proce-i durea to + 15 percent of the mean range value. This limitation of the voltage variable is contained in paragraph 5 5 2.1 and applies only to procedures which require qualification. Paragraph k.10.2 is applicable to prequalified velding procedures. It states:
"The classification and size of electrod$ are length, voltage and amperage shall be suited to the thickness of material, type of groove, velding position and ather circumstances attendin6 the work."
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CPCo has made an oral inquiry to the secretary of the AWS code Committee who has concurred with our position. A written inquiry to document this is being pursued. CPCo believes that the voltage and amperage ranges for these materials arv suitable. Additional evidence of this suitability is given through qualification of corresponding velding procedure specifications under the requirements of ASME.
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