ML20216C262
| ML20216C262 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/08/1998 |
| From: | Kalyanam N NRC (Affiliation Not Assigned) |
| To: | Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| GL-96-06, GL-96-6, TAC-M96838, TAC-M96839, NUDOCS 9805190169 | |
| Download: ML20216C262 (4) | |
Text
May 8, 1998
- Mr. J. P. O'Hanlon Senior Vice President - Nuclear Virginia Electric and Power Company 5000 Dominion Boulevard Glen Allen, VA 23060
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE GL 96-06 RESPONSE FOR NORTH ANNA POWER STATION, UNITS 1 AND 2 (TAC NOS.
M96838 AND M96839)
Dear Mr. O'Hanlon:
Generic Letter (GL) 96-06, " Assurance of Equipment Operability and Containment Integrity During Design-Basis Accident Conditions," dated September 30,1996, included a request for licensees to evaluate cooling water systems that serve containment coolers to assure that they are not vulnerable to waterhammer and two-phase flow conditions. Virginia Electric and Power Company (the licensee) provided its assessment of the waterhammer and two-phase Cow issues for the North Anna Power Plant, Units 1 and 2, in a letter dated January 28,1997.
The NRC staff is reviewing and evaluating your request. Additional information, as discussed in the Enclosure, is requested in order for the staff to complete its review. We request that you respond within 30 days.
Sincerely, (Original Signed By)
~
N. Kalyanam, Project Manager Project Directorate 11-1 Division of Reactor Projects - 1/11 Office of Nuclear Reactor Regulation Docket Nos. 50-338 and 50-339
Enclosure:
Request for Additional Information cc w/ enclosure: See next page DISTRIBUTION:
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l Mr. J. P. O'Hanlon North Anna Power Station Virginia Electric & Power Company Units 1 and 2 cc:
Mr. J. Jeffrey Lunsford County Administrator Regional Administrator, Region !!
Louisa County U.S. Nuclear Regulatory Commission P.O. Box 160 Atlanta Federal Center Louisa, Virginia 23093 61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia 30303 i
Michael W. Maupin, Esquire
)
Hunton and Williams Mr. W. R. Matthews, Manager Riverfront Plaza, East Tower North Anna Power Station 951 E. Byrd Street P. O. Box 402 Richmond, Virginia 23219 Mineral, Virginia 23117 Dr. W. T. Lough Mr. R. C. Haag Virginia State Corporation U.S. Nuclear Regulatory Commission Commission Atlanta Federal Center Division of Energy Regulation 61 Forsyth St., SW, Suite 23T85 P. O. Box 1107 At'anta, Georgia 30303 Richmond, Virginia 23209 Mr. J. P. O'Hanlon Old Dominion Electric Cooperative Senior Vice President - Nuclear 4201 Dominion Blvd.
Virginia Electric and Power Company Glen Allen, Virginia 23060 innsbrook Technical Center 5000 Dominion Blvd.
Mr. J. H. McCarthy, Manager Glen Allen, Virginia 23060 Nuclear Licensing & Operations Support Mr. David Christian, Manager Virginia Electric and Power. Company Surry Power Station Innsbrook Technical Center Virginia Electric and Power Company 5000 Dominion Blvd.
5570 Hog Island Road Glen Allen, Virginia 23060 Surry, Virginia 23883 Office of the Attorney General Robert B. Strobe, M.D., M.P.H.
Commonwealth of Virginia State Health Commissioner i
900 East Main Street Office of the Commissbner Richmond, Virginia 23219 Virginia Department of Health P.O. Box 2448 Senior Resident inspector Richmond, Virginia 23218 North Anna Power Station U.S. Nuclear Regulatory Commission 1024 Haley Drive 1
Mineral, Virginia 23117
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UNITED STATES g
j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20566 4001 o%...../
REQUEST FOR ADDITIONAL INFORMATION FOR RESOLUTION OF GENERIC LETTER 96-06 ISSUES NORTH ANNA POWER STATION. UNITS 1 AND 2 (TAC NOS. M96838 AND M96839)
Generic Letter (GL) 96-06, " Assurance of Equipment Operability and Containment Integriti i
During Design-Basis Accident Conditions," dated September 30,1996, included a request for licensees to evaluate cooling water systems that serve containment air coolers to assure that they are not vulnerable to waterhammer and two-phase flow conditions. Virginia Electric and Power Company (the licensee) provided its assessment of the waterhammer and two-phase flow issues for North Anna 1 and 2 in a letter dated January 28,1997. The licensee indicated that the waterhammer and two-phase flow concerns are not applicable to the North Anna units since the containment air cooler cooling water system is not used to mitigate the effects of a design-basis accident and is isolated in response to a containment isolation signal. In order to assess the licensee's resolution of these issues, the following additional information is requested:
1.
Describe measures that have been taken to assure that plant operators will not use the containment air recirculation fan coolers and associated cooling water system as an option during or following a plant accident. Also, confirm that plant Emergency Operating Procedures do not allow plant operators to use the containment air recirculation fan coolers as an option following a plant accident.
2.
Implementing measures to assure that waterhammer will not occur, such as prohibiting post-accident operation of the affected system, is an acceptable approach for i
addressing the waterhammer concern. However, all scenarios must be considered to assure that the vulnerability to waterhammer has been eliminated. Confirm that all scenarios have been considered, including those where the affected containment penetrations are not isolated (if this is a possibility), such that the measures that have been established are adequate to prevent the occurrence of waterhammer during (and following) all postulated accident scenarios.
3.
Confirm that the waterhammer and two-phase flow analyses included a complete failure modes and effects analysis (FMEA) for all components (including electrical and pneumatic failures) that could impact performance of the cooling water system and confirm that the FMEA is documentcd and available for review, or explain why a complete and fully documented FMEA was not performed.
ENCLOSURE
2 l
4.
Provide a simplified diagram of the affected system, showing major components, active i
components, relative elevations, lengths of piping runs, and the location of any orifices and l
flow restrictions.
I 5.
Describe in detail any plant modifications or procedure changes (other than those already described in response to question 1, above) that have been made or are planned to be made to resolve the waterhammer and two-phase flow issues.
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