ML060890398
| ML060890398 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 04/11/2006 |
| From: | Geoffrey Miller NRC/NRR/ADRO/DORL/LPLB |
| To: | Peschel J, St.Pierre G Florida Power & Light Energy Seabrook |
| Miller G, NRR/DLPM, 415-2481 | |
| References | |
| GL-04-002, TAC MC4716 | |
| Download: ML060890398 (6) | |
Text
April 11, 2006 Mr. Gene F. St. Pierre, Site Vice President c/o James M. Peschel Seabrook Station FLP Energy Seabrook, LLC PO Box 300 Seabrook, NH 03874
SUBJECT:
SEABROOK STATION, UNIT NO. 1 - REQUESTED EXTENSION OF COMPLETION SCHEDULE FOR NRC GENERIC LETTER 2004-02, POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY RECIRCULATION DURING DESIGN BASIS ACCIDENTS AT PRESSURIZED WATER REACTORS (TAC NO. MC4716)
Dear Mr. St. Pierre:
In a January 27, 2006, supplemental response to Nuclear Regulatory Commission (NRC)
Generic Letter (GL) 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors, Florida Power and Light (FPL) described its activities directed at resolution of the GL. FPL also stated that FPL Energy Seabrook, LLC, (the licensee for Seabrook Station, Unit No. 1 (Seabrook)) is in the process of planning and implementing a significant number of regulatory-driven, safety, and equipment reliability projects at Seabrook. FPL stated that major projects scheduled for the fall 2006 refueling outage at Seabrook include a first-time reactor vessel head volumetric inspection, control rod guide tube support (split) pin replacement, 100% steam generator eddy current testing, main generator rewind, installation of a new excitation system on the main generator, and the installation of an upgrade to the feedwater ultrasonic flowmeter instrumentation.
FPL stated that Seabrooks passive strainer design still has a number of open industry and plant-specific design issues to resolve, with the Seabrook strainer head loss and chemical effects testing by the vendor scheduled for completion in April 2006. FPL also stated that the resolution of industry and plant-specific analyses and testing issues after April 2006 may require additional design changes and there may not be adequate time to finalize the design and fabricate the strainers for installation in the fall 2006 refueling outage.
In Attachment 2 to the January 27, 2006, FPL letter, the licensee provided bases for a conclusion that it is acceptable to extend the completion of the corrective actions for the issues discussed in GL 2004-02 until the Seabrook spring 2008 outage, scheduled to begin on April 1, 2008.
Part 1 of Attachment 2 to the FPL letter was a discussion of the low risk associated with approval of the requested extension. In the conclusion of that discussion, FPL stated that it has calculated that the additional risk associated with a four-month extension would be less than 1E-6.
G. F. St. Pierre In support of this extension, FPL noted that favorable existing conditions at Seabrook are:
A relatively large existing sump screen (350 sq. ft.);
A low sump approach velocity of 0.192 ft/sec for a 50% blocked screen (which facilitates settling of debris);
The fact that the floor surrounding the sump slopes away from the sump, so heavy particles or pieces of debris would have a difficult time reaching the screen; Containment cleanliness with specific loose debris attention;Bulletin 2003-01 procedural guidance, training and actions (e.g., throttling or securing pumps);
The lack of calcium silicate insulation material at Seabrook; and The leak-before-break principle applicable at Seabrook. also addressed plans for additional mitigative measures to be taken during the fall 2006 refueling outage, including:
Installation of containment floor flow path debris interceptors; A calculated reduction in fibrous insulation material debris load at the sump of 30%;
An expected ability to claim a four-pipe diameter zone of influence (4D ZOI) for qualified coatings rather than the 10D ZOI of the Nuclear Energy Institute guidance document for implementing solutions for GL 2004-02.
Given the above considerations, the NRC has confidence that FPL has a plan that will result in the installation of modifications that provide acceptable strainer function with adequate margin for uncertainties. Further, the NRC has concluded that FPL has put mitigation measures in place to adequately reduce risk for the requested short extension period, and that it is, therefore, acceptable to extend the completion date for the corrective actions for the issues discussed in GL 2004-02 until the completion of the Seabrook spring 2008 refueling outage,
G. F. St. Pierre scheduled to begin on April 1, 2008. Should FPL elect to begin the outage more than 30 days after April 1, 2008, FPL will need to provide the NRC additional justification for further delay in completing corrective actions for GL 2004-02.
Sincerely,
/RA/
G. Edward Miller, Project Manager Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-443 cc: See next page
G. F. St. Pierre scheduled to begin on April 1, 2008. Should FPL elect to begin the outage more than 30 days after April 1, 2008, FPL will need to provide the NRC additional justification for further delay in completing corrective actions for GL 2004-02.
Sincerely,
/RA/
G. Edward Miller, Project Manager Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-443 cc: See next page DISTRIBUTION:
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DCullison JHopkins MScott RArchitzel SLu RGramm TMartin Accession Number: ML060890398 OFFICE LPL1-2/PM LPL1-2/LA DSS/SSIB/BC LPL1-2/BC NAME GEMiller:em CRaynor MScott DRoberts DATE 4/5/06 4/6/06 4/5/06 4/11/06 Official Record Copy
Seabrook Station, Unit No. 1 cc:
Mr. J. A. Stall Senior Vice President, Nuclear and Chief Nuclear Officer Florida Power & Light Company P.O. Box 14000 Juno Beach, FL 33408-0420 Mr. Peter Brann Assistant Attorney General State House, Station #6 Augusta, ME 04333 Resident Inspector U.S. Nuclear Regulatory Commission Seabrook Nuclear Power Station P.O. Box 1149 Seabrook, NH 03874 Town of Exeter 10 Front Street Exeter, NH 03823 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Office of the Attorney General One Ashburton Place, 20th Floor Boston, MA 02108 Board of Selectmen Town of Amesbury Town Hall Amesbury, MA 01913 Ms. Deborah Bell Federal Emergency Management Agency Region I J.W. McCormack P.O. &
Courthouse Building, Room 401 Boston, MA 02109 Mr. Tom Crimmins Polestar Applied Technology One First Street, Suite 4 Los Altos, CA 94019 Mr. Stephen McGrail, Director ATTN: James Muckerheide Massachusetts Emergency Management Agency 400 Worcester Road Framingham, MA 01702-5399 Philip T. McLaughlin, Attorney General Steven M. Houran, Deputy Attorney General 33 Capitol Street Concord, NH 03301 Mr. Bruce Cheney, Director New Hampshire Office of Emergency Management State Office Park South 107 Pleasant Street Concord, NH 03301 Mr. M. S. Ross, Managing Attorney Florida Power & Light Company P.O. Box 14000 Juno Beach, FL 33408-0420 Mr. Rajiv S. Kundalkar Vice President - Nuclear Engineering Florida Power & Light Company P.O. Box 14000 Juno Beach, FL 33408-0420 James M. Peschel Regulatory Programs Manager Seabrook Station FPL Energy Seabrook, LLC PO Box 300 Seabrook, NH 03874 Marjan Mashhadi Senior Attorney Florida Power & Light Company 801 Pennsylvania Ave., NW Suite 220 Washington, DC 20004
Seabrook Station, Unit No. 1 cc:
David Moore Vice President, Nuclear Operations Support Florida Power & Light Company P.O. Box 14000 Juno Beach, FL 33408-0420