ML20248K591
| ML20248K591 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 06/03/1998 |
| From: | Woodard J SOUTHERN NUCLEAR OPERATING CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-89-10, GL-96-05, GL-96-5, LCV-0904-C, LCV-904-C, NUDOCS 9806100178 | |
| Download: ML20248K591 (3) | |
Text
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.f J. D. Wood:rd Southern Nuclear Executive Vice President Operating Compa y.Inc.
40 inverness Center Parkway l
Post Office Box 1295 Birmingharn, Alabama 35201 Tel 205.992.5086 k
SOUTHERN h COMPANY Energy to Sern %ur World*
June 3, 1998 LCV-0904-C Docket Nos.: 50-424 50-425 U. S. Nuclear Regulatory Commission ATTN: Document ControlDesk Washington, D. C. 20555 Ladies and Gentlemen:
VOGTLE ELEC'I RIC GENERATING PLANT GENERfC LETTER 96-05 MOV PERIODIC VERIFICATION PROGRAM JOG SUPPLEMENTAL SUBMITTAL The U. S. Nuclear Regulatory Commission (NRC) issued Generic Letter 96-05," Periodic Verification of Design-Basis Capability of Safety-Related Motor-Operated Valves" on September 18,1996. The generic letter requests licensees "to establish a program, or to ensure the effectiveness ofits current program, to verify on a periodic basis that safety-related MOVs continue to be capable of performing their safety functions within the current licensing bases of the facility". In response to the generic letter, Southern Nuclear Operating Company (SNC) completed a review of the VEGP MOV periodic verification program which was established in conjunction with the implementation of Generic Letter 89-10, and treasmitted a summary of that review to the NRC in letter LCV-0904-B dated March 12,1997.
O In addition, VEGP is participating in the Joint Owners Group (JOG) Program on MOV
' Periodic Verification, as outlined in topical report MPR-1807 Revision 2, and as approved by the NRC in a Safety Evaluation (SE) issued October 30,1997. P auest of the JOG, SNC is providing this response to the NRC addressing VF
. intentions regarding the implementation of the program outlined in the topical report. The JOG Program, as approved, consists of the following three major elements:
- 1. An " interim" static test program aimed at ensuring that each MOV in the program is maintained in a configuration which will ensure that it is capable of performing its design-basis function.
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. 2. A dynamic test program aimed at assessing and quantifying the potential for inservice degradation of valve internal components.
- 3. The analysis and evaluation of the data obtained in the dynamic test program, and a -
subsequent assessment of the adequacy of the " interim" static test program based on the resolution of this data.
SVEGP has completed (fall of 1997) the initial dynamic tests on the four valves assigned to t
l VEGP in conjunction with the JOG Program. Each of the four valves will be dynamicalh
- tested two additional times (spring of 1999 and fall of 2000), with the test results being
. forwarded to the JOG Program for final evaluation. VEGP will monitor the results of the
' JOG dynamic test program, and ~will assess the adequacy of the VEGP static test program based on these results. The VEGP static test program will be adjusted, as required, based on the results of the JOG dynamic test program, to ensure that safety-related MOVs will be capable of performing their design-basis functions over the established static test interval; b
. The static test program as described in the JOG topical report is carried out at a frequency which depends on the importance (risk contribution) and the margin of the valve. As stated in the JOG topical report, the risk and margin criteria defined in the JOG static test program are preliminary, are based on judgement and experience, and are subject to change. To date the VEGP MOVs have not been risk ranked.
VEGP established a periodic static test program in conjunction with the implementation l
..of the recommendations contained in Generic Letter 89-10. The VEGP GL 89-10 static test program requires that valves be statically tested on a 5 year /3 cycle interval, as recommended in GL 89-10. This frequency has'not been altered with respect to addressing GL 96-05. However, it is VEGP's intent to prioritize valve test activities based on a combination of risk significance and deterministic considerations similar to the program described in the JOG topical report. The Westinghouse Owners Group (WOG) has developed a generic methodology for use in risk ranking MOVs utilized in Westinghouse PWRs. This methodology will be evaluated for use in risk ranking MOVs
'at VEGP. VEGP's objective is to adjust the static test frequency for individual MOVs to reflect the relative risk Significance and available margin while continuing to provide
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adequate assurance that the MOV will be capable of performing its safety function until the next scheduled test.-
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1 Therefore, VEGP is an active participant in the JOG dynamic test program, but because of j
the preliminary nature of the JOG " interim" static test program, at this time VEGP will l
- continue to utilize the static test program currently in place. The adequacy of the VEGP l
static test program will be routinely assessed as dynamic test data becomes available, and the program will be adjusted as required based on the results of this testing.
Should you require any additional information regarding this response, please contact my
)
office.
i Sincerely,
. Woodard JDW/HPW xc:
Southern Nuclear Operating Comnany Mr. J. B. Beasley, Jr.
Mr. M. Sheibani SNC Document Management U. S. Nuclear Regulatory Commission Mr. L. A. Reyes, Regional Administrator Mr. D. H. Jaffe, Senior Project Manager, NRR Mr. J; Zeiler, Senior Resident Inspector, Vogtle -
i LCV-0904-C
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