ML19207C045

Outlines Controls Adopted for Weld Filler Matl Which Allow Use of E7018 Electrodes in Unheated Containers for Periods of Up to 14-h When Issued for Use on Plain Carbon Steel Weldments.Request Concurrence

ML19207C045
Person / Time
Site:	Grand Gulf
Issue date:	08/23/1979
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:	Stolz J Office of Nuclear Reactor Regulation
References
NUDOCS 7909060366
Download: ML19207C045 (2)

Text

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MISSISSIPPI POWER & LIGHT COMPANY 4

Helping Build Mississippi P. O.

B O X 16 4 0, J A C K S O N, MISSISSIPPI 39205 PR O DUCTIO N DEPARTMENT Mr. John F. Stolz August 23, 1979 Office of Nuclear Regulation U. S. Nuclear Regulatory Commission Washington, D. C.

20555

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Numbers 50-416/50 '+17 File 0270/0277/1066 Moisture Controls for E7018 Arc-welding Electrodes AECM-79/86 This letter is to inform you that Mississippi Power and Light Co=pany is currently adopting controls of weld filler material which allow the use of E7018 electrodes in unheated containers for periods of up to 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> when issued for use on plain carbon steel weldments.

The approval to permit the 14-hour condition was based on a thorough review of the original test data contained in a report entitled, " Qualification of an Alternative Elec-trode Control Program for AWS D1.1 for the Arizona Nuclear Power Project, Palo Verde Units 1, 2 and 3," dated March 15, 1978. This report substan-tiated the use of E7018 electrodes in unheated containers for as long as 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and the report was subsequently accepted by the NRC.

Review of test data indicates that the use of E7018 electrodes in un-heated containers for up to 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> is technically acceptable because of the conservative test program conditions imposed in generating the original data in combination with the more than adequate test results.

A su==ary of program test conditions and results is as follows :

1.

The test program utilized 15 and 20-hour moisture ex-posure times.

2.

Three exposure cycles at 15 and 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> were utilized.

3.

High humidity conditions of 86 and 100 percent were used for the times and cycles indicated above.

4.

Four brands of commercial E7018 electrodes were tested.

5.

Extreme restraint was used during the welding of test coupons including circular patch coupons.

6.

The results of mechanical property testing and nondestruc-g(

tive examination exceeded minimum requirements indicating O

considerable margin even under conservative test conditions.

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MISSISSIPPI POWER & LIGHT COMPANY Mr. John F. Stolz Office of Nuclear Reactor Regulation AECM-79/86 Please provide us with your concurrence at your earliest possible convenience.

Yours truly, s?h L. F. Dale Nuclear Project Manager JRF/pa

References:

See Page 3 cc:

Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. John G. Davis, Director Division of Inspection & Enforcement U. S. Nuclear Regulatory Cornission Washington, D. C.

20555 c,.,

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1

Reference 1:

Letter, Edwin E. VanBrunt, Jr. (Arizona Public Service Company) to Edson G. Ca se (NROS, April 4, 1978.

Reference 2:

Report, " Qualification of an Alternative Electrode Control Program for AWSDI.1," >brch 15, 1978, Arizona Public Se rvice Company.

Reference 3:

Letter, John F. Stolz (NRC) to E. E. VanBrunt, Jr. (Arizona Public Service Company), April 24, 1978.

Reference 4:

Letter, J. P. McGaughy, Jr. (MP&L) to John F. Stolz (NRC),

June 7, 1978.

Reference 5:

Let ter, John F. Stolz (NRC) to N. L. Stampley (MP&L),

January 29, 1979.

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