ML20199L035
| ML20199L035 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 11/24/1997 |
| From: | Lyons J NRC (Affiliation Not Assigned) |
| To: | Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| Shared Package | |
| ML20199L042 | List: |
| References | |
| GL-90-05, GL-90-5, TAC-M98278, TAC-M98279, NUDOCS 9712010260 | |
| Download: ML20199L035 (3) | |
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UNITED STATES y
NUCLEAR REGULATORY COWAld8 ION WASH 8NGTON, D.C. suesa401 November 24, 1997 Mr. J. P. O'Hanlon Senior Vice President - Nuclear Virginia Electric and Power Company 5000 Dominion alvd.
Glen Allen. Vtrginia 23060
SUBJECT:
NORTH ANNA POWER STATION UNIT 1 AND UNii 2 - ASME SECTION XI RELIEF REQUEST NDE 32 - SERVICE WATER SYSTEM (SWS) LEAKS (TAC NOS. M98278 AND M98279)
Dear Mr. O'Hanlon:
The NRC staff has evaluated the information provided in your submittal dated i
february 24, 1997, the response of August 8.1957, to our Request for
- Additimal Information (RAI), and your letter dated Noverreer 24, 1997, sunmarizing the implementation requirements, related to the inservice inspection program relief reauest NDE 32.
Based on the evaluation of relief request NDE-32, it is concluded that the performance of an immediate Code repair after each and every newly discovered flaw caused by microbiologically induced corrosion (MIC) would have constituted an undue b9rden (create undue hardship) limits imaosed by theupon V Power Company since the repair may exceed the time governing Technical Specification. This would necessitate tie isolation of portions of the SWS tnat are otherwise structurally sound and capable of performing their intended safety function.
Isolating portions of the SWS to perfcm a Code repair is not in the best interest of plant safety, given the magnituoe of the flaw and your alternative program.
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Your alternative )rogram for this period includes evaluation of the flaws consistent with tie guidelities and acceptance criteria of Generic Letter (GL) 90 05. Upon discovery. each flaw detected will be documented in the corrective actirm system by deviation report.
Identification of a i
I structurally inadequate weld will result in associated piping to be declared inoperable and an appropriate Technical Specification action statement to be taken. The-through-wall flaws and lukage rates will be monitored. An augmented inspection program will be performed on a quarterly basis on a sample of a mininum of ID welds 5n the SWS for augmented radiographic ins )ections.
You have further stated that all the flaws will be repaired witiin 18 months from the day of the identification of the flaws and the documentation of the SWS inspection, monitoring program and repair of identified flaws will be maintained on site, available for inspector review, and in accordance with the quality records retention requirements.
This alternative to the Code requirement will be followed for the remainder of the sec.ond 10 year inspection interval. The Unit I second 10 year interval will end on December 24. 1998, and the Unit 2 second 10-year interval will end on December 14. 2000. Vhe staff finds the structural integrity and operability assessments as well as the proposed actions to meet the Code requirements to be acceptable and this request to be reasonable.
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. While the impracticality of the Code requirements was not shown, the st ff finds that relief may be granted pursuant to 10 CFR 50.55a(a)(3)(ii) because com)liance with the requirement would result in hardship or unusual difficulty wit 1out a compensating increase in the level of quality and safety.
The staff's evaluation and conclusions are contained in the Enclosure.
The staff has completed its evaluation of this matter and we are. therefore.
closing out TAC Nos. M98278 and M98279.
a Sincerely.
(Original Signed fly)
James E. Lyons. Director Project Directorate 11 1 Division of Reactor Projects - 1/11 Office of Nuclear Reactor Regulation Docket Nos. 50 338 and 50 339 rncic;ure:
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Mr. J. P. O'Hanlon North Anna Power Station Virginia Elect!'ic & Power Company Units 1 and 2 CC:
Mr. J. Jeffrey Lunsford County Administrator Regional Administrator. Region 11 Louisa County U.S. Nuclear Regulatory Comission P.O. Box 160 Atlanta Federal Center Louisa. Virginia 23093 61 Forsyth St.. SW. Suite 23T85 Atlanta, Georgia 30303 Michael W. Maupin Esquire Hunton and Williams Mr. W. R. Matthews. Manager Riverfront Plaza. East Tower North Anna Power Station 951 E. Byrd Stt,tet P. O. Box 402 Richmnnd Virginia 23219 Mineral. Virginia 23117 Dr. W. T. Lough Mr. Al Belisle Virginia State Corporation U.S. Nuclear Regulatory Comission Comission Atlanta Federal Center Division of Energy Regulation 61 Forsyth St.
SW. Suite 23Td5 P. O. Box 1197 Atlanta Georgia 30303 Richmond, Virginia 23209 Mr. David Christian Manager Old Dominion Electric Cooperative Surry Power Station 4201 Dominion Blvd.
Virginia Electric and Power Company Glen Allen. Virginia 23060 5570 Hog Island Road Surry, Virginia 23883 Mr. J. H. McCarthy& Operations
. Manager Nuclear Licensing Support Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Blvd.
Glen Allen. Virginia 23060 Office of the Attorney General Commonwealth of Virginia 900 East Main Street Richmond, Virginia 23219 Senior Resident Inspector North Anna Power Station U.S. Nuclear Regulatory Comission 1024 riale Mineral. y Drive Virginia 23117 Robert B. Strobe M.D., M.P.H.
State Health Comissioner Office of the Comissioner Virginia Department of Health P.O. Box 2448 Richmond, Virginia 23218 i
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