ML20079L231
| ML20079L231 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 10/28/1991 |
| From: | Joshua Wilson TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-89-10, NUDOCS 9111060176 | |
| Download: ML20079L231 (3) | |
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.em m; J L W.ison vo neudert toxpn two twe October 28, 1991 U.S. Nuclear Regulatory Conwission ATTN: Document Control Desk Washington, D.C. 20555
. Gentlemen:
In t'.ie Matter of
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Docket Nos. 50-327 Tezinessee Valley Authority
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50-328 SEQUOYAH NUCLEAR PIANT - SUPPLEMENTAL INFORMATION FOR COMPLIANCE WITH GENERIC LETTER (GL) 89-10
Reference:
TVA Ictter to NRC dated December 21, 1989, " Browns Ferry Nuclear Plant (BFN), Sequoyah Nuclear Plant (SQN), and Watts Bar Nuclear Plant (WBN)
Response to Generic Letter (GL) 89 Safety-Related Motor-Operated Valve (MOV) Testing and Surveillance" The purpose of this letter is-to notify NRC of TVA's_ intent to pursue a grouping methodelogy-for testing of GL 89-10 motor-operated valves (MOVs). This methodology could limit the number of MOVs that are tested at differential pressure conditions. This would be a variance from current GL 89-10 recommendations and from TVA's commitment as contained in the-referenced letter.
l The enclosure provides TVA's current position with regard to implemencing the grouping methodology within TVA's GL 89-10 program.
l If you have any questions, please telephone D. V. Goodin at (615) 843-7734.
l Sincerely, 3 6^-
.j.fL. Wilson Euclosure cc:
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. 0ctober 28. 1991 Enclosure f
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U.S. Nuclear Regulatory Commission ATTN:
Mr. B. A. Wilson, Project Chief Region II.
101 Marietta Street,IW, Suite 2900-l Atlanta, Georgia 30323 Mr. D. - E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road
--Soddy. Daisy,-Tennessee 37379 N
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l ENCLOSVRE It is TVA's commitment to implement Generic Letter (GL) 89-10 in a manner that ensures the ability of motor-operated valves (MOVs) to function at design basis conditions.
Presently, this includes differential pressure (dp) testing of GL 89-10 MOVs where practicable.
As part of TVA's program to implement GL 89-10, a grouping methodology is being developed that may be used for two purposes.
This methodology will be used primarily to ensure the functional capability of MOVs for which dp testing is not practicable. A secondary objective of the grouping methodology would be to provide an option for limitii.g the number of MOVs that need to be tested at dp conditions to ensure the ability to function at the worst-case design basis condition.
This secondary objective would be a variance from the guidance provided in GL 89-10.
TVA intends to validate the grouping methodology through in-plant testing and utilization of industry data such es test results from the Electric Power llesearch Institute MOV Performance Prediction Program.
Supporting the validation of the grouping methodology is 'IYA's calculamion process, which is more conservative than previously used vendor equations.
These calculations are expected to envelope the results of testing performed at dp conditions.
Details and justification for TVA's grouping methodology will be retained
- onsite, lJn t il the grcuping methodology can be fully defined and technically justified, TVA will continue to perf orm dp test ing for GL 89-10 MOVs where practicable.
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