ML20126E402
| ML20126E402 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 06/10/1985 |
| From: | Mcdonald R ALABAMA POWER CO. |
| To: | Varga S NRC, Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8506170068 | |
| Download: ML20126E402 (2) | |
Text
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Malling Addcss Alabama Power Company 600 North 18th Street
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Post Office Box 2641 Birmingham, Alabama 35291 Telephone 205 783-6090 R. P. Mcdonald Senior Vice President Fiintridge Buildina AlabamaPower o n,,w g:-
e e June 10, 1985 Docket No. 50-348 Director, Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Mr. S. A. Varga Joseph M. Farley Nuclear Plant - Unit 1 Reactor Containment Building Integrated Leak Rate Test Supplement Gentlemen:
By letter of April 25, 1985, Alabama Power Company supplemented its April 1984 Unit 1 Integrated Leak Rate Test Report with summary data of the local leak rate tests performed since the previous periodic integrated leak rate tests. As a result of a re-evaluation of the "as-found" data in this suppinent, it has been determined that penetration 12 for the fifth refueling Type C local leak rate tests should have been reported as having an indeterminate leakage rate and Note 1 changed to reflect that two valves for this penetration had detectable leakage.
In addition, two valves for penetration 13 should also have been reported as having detectable leakage for the fifth refueling Type C local leak rate tests.
Penetrations 12 and 13 are the containment purge and vent penetrations which have two 48 inch valves each with an 8 inch valve which bypasses it to permit purging during plant operation. The four valves at these penetrations are tested by an interspace pressurization test. This test configuration provides conservative total leakage data because leakage is measured assuming the valves are utilized in parallel instead of the actual post-accident series type operation. When the Local Leak Rate Testing was performed on Penetration 12, one major (from an outside containment valve) and one minor (from an inside containment valve) source of leakage was detected; however, the minor source of leakage was inadvertently omitted from the data included in the April 25, 1985 report. These two valves were repaired at the same time and then retested rather than one being tested prior to the other being
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Mr. S. A. Varga June 10, 1985 U. S. Nuclear Regulatory Commission Page 2 repaired. As a result, it is not now possible to exactly quantify the minor "as found" leakage. A similar situation existed for penetration 13 except that the two valves with det.ctable-leakage were parallel outside containment valves.
The Penetration 13 leakage rate determina-tion thus remains unchanged.
Alabama Power Company considers the actual leakage rate to have not changed significantly from the April 25, 1985 supplementary report but is providing this corrected information to enhance the accuracy of the data provided.
If you have any questions, please advise.
Yours very truly
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'l R. P. Mcdonald RPM / JAR:gri-D8 cc:
Mr. L. B. Long Dr. J. N. Grace Mr. E. A. Reeves Mr. W. H. Bradford