ML091811205
| ML091811205 | |
| Person / Time | |
|---|---|
| Site: | Boiling Water Reactor Owners Group |
| Issue date: | 07/07/2009 |
| From: | Rosenberg S NRC/NRR/DPR/PSPB |
| To: | Coleman D Energy Northwest |
| References | |
| Download: ML091811205 (4) | |
Text
July 7, 2009 Mr. Doug Coleman, Chair BWROG Energy Northwest Columbia Generating Station Mail Drop PE20 P.O. Box 968 Richland, WA 99352-0968
SUBJECT:
VERIFICATION OF INFORMATION ON CONTAINMENT ACCIDENT PRESSURE USED FOR PUMP NET POSITIVE SUCTION HEAD
Dear Mr. Coleman:
The U.S. Nuclear Regulatory Commission (NRC) staff is discussing with the Advisory Committee on Reactor Safeguards (ACRS) the use of containment accident pressure (CAP) to assure adequate net positive suction head (NPSH) for safety-related pumps. CAP is that pressure above ambient using assumptions to minimize containment pressure and maximize suppression pool temperature. This is not to be confused with the peak accident pressures calculated for containment integrity verification. CAP has been credited by some boiling water reactors (BWRs) to help ensure head pressure to the emergency core cooling system pumps or containment heat removal pumps.
The NRC staff developed the enclosed table that shows the magnitude and duration CAP is required. The table is limited to BWRs with a Mark I containment. The Mark II and Mark III containment designs do not need to credit CAP. The information in the table is from NRC-approved license amendments that credit CAP, with the exception of the license amendment requests for EPUs for Browns Ferry Nuclear Plant Units 1, 2, and 3 and Monticello Nuclear Generating Plant. These EPU applications are currently under NRC review. The NRC requests your assistance with filling in the missing information and verifying that transcription errors have not been introduced in the remaining data. The NRC is not requesting any new or updated analyses. Please provide any comments or corrections via e-mail by August 28, 2009, to Bruce R. Heida at bruce.heida@nrc.gov.
The final table will be issued after making any necessary changes and will be made publicly available in the Agencywide Documents Access and Management System (ADAMS). Below is a brief definition/explanation of selected headings within the table.
Definition/explanation of select Column headings in enclosed table:
Column 4:
provides information on related documents, including ADAMS accession numbers and document date. Unless otherwise specified, the accession numbers are for incoming documents submitted by the licensee.
Column 5:
lists the pumps requiring CAP to support the required Net Positive Suction Head (NPSH).
Column 6 provides the CAP available.
Column 7:
provides the minimum CAP needed to support the required NPSH.
Column 8:
is the margin as defined.
Columns 10 and 11: provide information on the extended power uprate.
Column 12:
is the ratio of the licensed thermal power to the minimum volume of water in the suppression pool.
If you have any questions regarding this matter, please contact Michelle C. Honcharik at (301) 415-1774.
Sincerely,
/RA/
Stacey L. Rosenberg, Chief Special Projects Branch Division of Policy and Rulemaking Office of Nuclear Reactor Regulation Project No. 691
Enclosure:
Draft Table cc/encl.: See next page
Column 5:
lists the pumps requiring CAP to support the required Net Positive Suction Head (NPSH).
Column 6 provides the CAP available.
Column 7:
provides the minimum CAP needed to support the required NPSH.
Column 8:
is the margin as defined.
Columns 10 and 11: provide information on the extended power uprate.
Column 12:
is the ratio of the licensed thermal power to the minimum volume of water in the suppression pool.
If you have any questions regarding this matter, please contact Michelle C. Honcharik at (301) 415-1774.
Sincerely,
/RA/
Stacey L. Rosenberg, Chief Special Projects Branch Division of Policy and Rulemaking Office of Nuclear Reactor Regulation Project No. 691
Enclosure:
Draft Table cc/encl.: See next page DISTRIBUTION:
PUBLIC PSPB Reading File RidsNrrDpr RidsNrrDprPspb RidsNrrLADBaxley RidsAcrsAcnwMailCenter RidsNrrPMMHoncharik RidsOgcMailCenter RidsNrrDss RidsNrrDssScvb Bruce Heida Thomas Alexion SRosenberg (Hardcopy)
ADAMS ACCESSION NOs.: Package: ML091820015 Cover letter: ML091811205
Enclosure:
ML091811209 NRR-106 OFFICE PSPB/PM PSPB/LA SCVB/BC NRR/DSS PSPB/BC NAME MHoncharik Via e-mail DBaxley, GKL for RDennig WRuland SRosenberg DATE 07/01/09 07/01/09 07/01/09 07/07/09 07/07/09 OFFICIAL RECORD COPY
BWR Owners= Group Project No. 691 Mr. Richard Libra Executive Vice Chair, BWR Owners= Group Exelon Generation Co, LLC 200 Exelon Way Mail Code KSA 2-N Kennett Square, PA 19348 Rick.libra@exeloncorp.com Mr. Richard Anderson BWROG, Executive Chair FPL Energy (DAEC)
Duane Arnold Energy Center 3277 DAEC Road Palo, IA 52324 rich.anderson@fpl.com Mr. James F. Klapproth GE-Hitachi Nuclear Energy M/C A50 3901 Castle Hayne Road Wilmington, NC 28401 james.klapproth@ge.com Mr. Joseph E. Conen, Vice Chair Regulatory Response Group BWR Owners= Group DTE Energy-Fermi 2 200 TAC 6400 N. Dixie Highway Newport, MI 48166 conenj@dteenergy.com Dennis Madison, Hatch Vice President Southern Nuclear Operating Co.
11028 Hatch Parkway North Baxley, GA 31515-2010 drmadiso@southernco.com Frederick Emerson BWROG, Project Manager Frederick.emerson@ge.com Mr. Ken A. McCall, Program Manager GE-Hitachi Nuclear Energy M/C F12 3901 Castle Hayne Road Wilmington, NC 28401 kenneth.mccall@ge.com Oscar Limpias Entergy Nuclear Northeast 1340 Echelon Parkway.
Jackson, MS 39213-8202 olimpia@entergy.com Joe Donahue Progress Energy Inc.
410 S. Wilmington St.
PEB 6A Raleigh, NC 27601-1849 joe.w.donahue@pgnmail.com Paul J. Davison Hope Creek Generating Station P.O. Box 236 Hancocks Bridge, NJ 08038 paul.davison@pseg.com Mr. Ted Schiffley Vice Chairman, BWROG Exelon Generation Co., LLC.
Cornerstone II at Cantera 4300 Winfield Road Warrenville, IL 60555 frederick.schiffley@exeloncorp.com Mr. Randy C. Bunt, Chair Regulatory Response Group Southern Nuclear Operating Company 40 Inverness Center Parkway/Bin B057 Birmingham, AL 35242 rcbunt@southernco.com 8/6/08