RC-12-0058, Response to NRC Request for Additional Information Regarding Technical Specification Change to Extend Integrated Leak Rate Test Interval One-Time

Response to NRC Request for Additional Information Regarding Technical Specification Change to Extend Integrated Leak Rate Test Interval One-Time

ML12101A302
Person / Time
Site:	Summer
Issue date:	04/05/2012
From:	Gatlin T South Carolina Electric & Gas Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RC-12-0058
Download: ML12101A302 (2)

Text

Thomas D. Gatlin Vice President, Nuclear Operations 803.345.4342 A SCANA COMPANY April 5, 2012 RC-12-0058 Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

VIRGIL C. SUMMER NUCLEAR STATION (VCSNS) UNIT 1 DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 RESPONSE TO NRC REQUEST FOR ADDITIONAL INFORMATION License Amendment Request - LAR (11-04569)

Technical Specification Change to Extend Integrated Leak Rate Test Interval One-Time This letter provides South Carolina Electric & Gas Company's (SCE&G) response to the NRC's request for additional ILRT results regarding the VCSNS Containment Integrate Leak Rate Test extension application. Pursuant to 10 CFR 50.90, SCE&G requested an amendment for Virgil C.

Summer Nuclear Station Unit One (VCSNS) Technical Specification (TS) 6.8.4(g) that would allow for a one-time extension to the ten-year frequency of the VCSNS containment leakage rate test (e.g., Integrated Leak Rate Test [ILRT] or Type A test). The proposed change would permit the existing ILRT frequency to be extended from ten years to approximately 10.9 years. VCSNS's additional ILRT results are listed below:

Previous ILRT Results 1981:

0.055 %wt/day = 95% Upper Confidence Limit 1984:

0.091 %wt/day = 95% Upper Confidence Limit 1988:

0.106 %wt/day = 95% Upper Confidence Limit 0.115 %wt/day = Overall As Left Results These ILRT test results confirm that the VCSNS containment structure leakage is acceptable, with considerable margin, with respect to the TS acceptance criterion of 0.20% of containment air weight per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at the design basis loss of coolant accident pressure.

Should you have questions, please contact Mr. Bruce L. Thompson at (803) 931-5042.

I certify under penalty of perjury that the information contained herein is true and correct.

/iS /-s/

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D.ý Gatin Exe uted on Thomas D. Gatlin BJQ/TDG/ts pi-7 Virgil C. Summer Station. Post Office Box 88 *Jenkinsville, Sc. 29065. F (803) 345-5209 Q -ý L

Document Control Desk CR-1 1-04569 RC-12-0058 Page 2 of 2 c:

K. B. Marsh S. A. Byrne J. B. Archie N. S. Carns J. H. Hamilton R. J. White W. M. Cherry V. M. McCree R. E. Martin NRC Resident Inspector K. M. Sutton S. E. Jenkins P. Ledbetter NSRC RTS (CR-1 1-04569)

File (813.20)

PRSF (RC-12-0058)