ML20216B702
| ML20216B702 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 05/08/1998 |
| From: | Andersen J NRC (Affiliation Not Assigned) |
| To: | Bowling M NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| GL-96-06, GL-96-6, TAC-M96834, NUDOCS 9805180356 | |
| Download: ML20216B702 (5) | |
Text
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Mr. Mirtin L. Bowling, Jr.
May 8, 1998 Rtcovery Officer - Techncal S:rvicss Northeast Nuclear Energy Company l
c/o Ms. Patricia A. Loftus Director-Regulatory Affairs P.O. Box 128 Waterford, CT 06385
SUBJECT:
MILLSTONE NUCLEAR POWER STATION, UNIT 3 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO GENERIC LETTER 96-06 (TAC NO. M96834)
Dear.Mr. Bowling:
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 air coolers to assure that they are not vulnerable to waterhammer and two-phase flow conditions. In a letter dated January 28,1997, Northeast Nuclear Energy Company (NNECO) provided its assessment of the waterhammer and two-phase flow issues for Millstone Unit 3. In order to complete the review of these issues, the NRC staff requires additionalinformation. Please respond to the
'hnclosed request for additionalinformation by July 30,1998.
Sincerely, Original signed by:
James W. Andersen, Project Manager Special Projects Office - Licensing Office of Nuclear Reactor Regulation Docket No. 50-423
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May 8, 1998 Mr. Martin L. Bowling, Jr.
Recovery Officer-Technical Services Northeast Nuclear Energy Company c/o Ms. Patricia A. Loftus Director-Regulatory Affairs P.O. Box 128 Waterford, CT 06385
SUBJECT:
MILLSTONd NUCLEAR POWER STATION, UNIT 3 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO GENERIC LETTER 96-06 (TAC NO. M96834)
Dear Mr. Bowling:
Generic Letter (GL) 96-06, " Assurance of Equipment Operability and Containr.ient integrity During Design-Basis Accident Conditions," dated September 30,1996, included a request forlicensees to evaluate cooling water systems that serve containment air coolers to assure that they are not vulnerable to waterhammer and two-phase flow conditions. In a letter dated January 28,1997, Northeast Nuclear Energy Company (NNECO) provided its assessment of the waterhammer and two-phase flow issues for Millstone Unit 3. In order to complete the review of these issues, the NRC staff requires additionalinformation. Please respond to the enclosed request for additional information by July 30,1998.
Sincerely, s W. Andersen, Project Manager j Special Projects Office-Licensing Office of Nuclear Reactor Regulation Docket No. 50-423
Enclosure:
Request for Additional Information cc w/ encl: See next page I
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REQUEST FOR ADDITIONAL INFORMATION MILLSTONE NUCLEAR POViER STATION. UNIT 3 QQQKET NO. 50-423 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 air coolers to assure that they are not vulnerable to waterhammer and two-phase flow conditions. Northeast Nuclear Energy Company (the licensee) provided its assessment of the waterhammer and two-phase flow issues for Millstone 3 in a letter dated January 28,1997. The licensee indicated that the containment coolers at Millstone Unit 3 are not safety-related and are not credited in the mitigation of a design-basis accident. The licensee concluded that waterhammer and two-phase flow conditions will not occur due, in part, to the elovation head that is available in the chilled water system (CDS) and the reactor plant component cooling water (CCP) system surge tanks.
In order to assess the licensee's resolution of these issues, the following additional information is requested:
Note: The following questions apply to waterhammer and two-phase flow assessments associated with cooling water systems that provide cooling for the containment air recirculation coolers.
1.
Discuss specific system parameter requirements that must be maintained to assure that waterhammer will not occur in the CDS and CCP system (e.g., surge tank level requirements, temperature requirements), and state the minimum margin to boiling that will exist for the worst case scenario, including consideration of measurement and analytical uncertainties. Describe and justify reliance on any nonsafety-related instrumentation and controls for assuring that waterhammer will not occur, and explain v/hy it would not be appropriate to establish Technical Specification requirements for miintaining these parameters.
2.
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 documented and available for review, or explain why a complete and fully documented FMEA was not performed.
3.
Explain and justify all uses of " engineering judgement."
4.
Provide a simplified diagram of the affected systems (CDS and CCP system), showing major components, active components, relative elevations, lengths of piping runs, and the location of any orifices and flow restrictions.
I 5.
Describe in detail any modifications (other 91an those discussed in response to i
question 1, above) that have been made (or will be made) to system design or operating requirements to resolve the waterhammer and two-phase flow issues.
l Enclosure
Millstona Nucle:r Pow;r Station Unit 3 cc:
Lillian M. Cuoco, Esquire Joseph R. Egan, Esquire Senior Nuclear Counsel Egan & Associates, P.C.
Northeast Utilities Service Company 2300 N Street, NW P. O. Box 270 Washington, DC 20037 Hartford, CT 06141-0270 Mr. F. C. Rothen l
Mr. Kevin T. A. McCarthy, Director Vice President - Work Services Monitoring and Radiation Division Northeast Utilities Service Company Department of Environmental Protection P. O. Box 128 l
79 Elm Street Waterford, CT 06385 l
Hartford, CT 06106-5127 l
Emest C. Hadley, Esquire Regional Administrator, Region i 1040 B Main Street U.S. Nuclear Regulatory Commission P.O. Box 549 475 Allendale Road West Wareham, MA 02576 King of Prussia, PA 19406 Mr. John Buckingham First Selectmen Department of Public Utility Control Town of Waterford Electric Unit Hall of Records 10 Liberty Square 200 Boston Post Road New Britain, CT 06051 Waterford, CT 06385 Mr. James S. Robinson, Manager Mr. Wayne D. Lanning Nuclear Investments and Administration Deputy Director of Inspections New England Power Company Special Projects Office 25 Research Drive 475 Allendale Road Westborough, MA 01562 l
King of Prussia, PA 19406-1415 Mr. John Streeter Mr. M. H. Brothers Recovery Officer - Nuclear Oversight Vice President-Millstone Unit 3 Northeast Utilities Service Company Northeast Nuclear Energy Company P. O. Box 128 i
P.O. Box 128 Waterford, CT 06385 l
Waterford, CT 06385 Deborah Katz, President Mr. M. R. Scully, Executi'te Director Citizens Awareness Network Connecticut Municipal Electric P.O. Box 83 Energy Cooperative Shelburne Falls, MA 03170 30 Stott Avenue l
Norwich, CT 06360 Mr. David Amerine Vice President-Human Services Northeast Utilities Service Company P. O. Box 128 Waterford, CT 06385
Millstone Nuclear Power Station Unit 3 cc:
Mr. Don Schopfer Mr. Allan Johanson, Assistant Director Verification Team Manager Office of Policy and Management Sargent & Lundy Policy Development and Planning 55 E. Monroe Street
- Division Chicago,IL 60803 450 Capitol Avenue - MS# 52ERN P. O. Box 341441 Mr. G. D. Hicks Hartford, CT 06134-1441 Director-Millstone Unit 3 Operations Northeast Nuclear Energy Company l
Citizens Regulatory Commission P.O. Box 128 ATTN: - Ms. Susan Perry Luxton Waterford, CT 06385 180 Great Neck Road Waterford, CT 06385 Senior Resident inspector Millstone Nuclear Power Station The Honorable Terry Concannon c/o U.S. Nuclear Regulatory Commission Nuclear Energy Advisory Council P. O. Box 513 1
Room 4035 Niantic, CT 06357 Legislative Office Building Capitol Avenue Mr. William D. Meinert l
Hartford, CT 06106 Nuclear Engineer Massachusetts Municipal Wholesale l
Mr. Evan W. Woollacott Electric Company Co-Chair P.O. Box 426 Nuclear Energy Advisory Council Ludlow, MA 01056 128 Terry's Plain Road Gimsbury, CT 06070 Attomey Nicholas J. Scobbo, Jr.
Ferriter, Scobbo, Caruso, Rodophele, PC i
Mr. John W. Beck, President 1 Beacon Street,11th Floor l
Little Harbor Consultants, Inc.
Boston, MA 02108 l
Millstone - ITPOP Project Office P.O. Box 0630 l
Niantic, CT 06357-0630 l
l Mr. B. D. Kenyon (Acting)
Chief Nuclear Officer Millstone Northeast Nuclear Energy Company P.O. Box 128 Waterford, CT 06385 Mr. Daniel L. Ct.ny Project Director Parsons Power Group Inc.
2675 Morgantown Road Reading, PA 19607