ML070670047

RAI Cycle 20 Minimum Critical Power Ratio Safety Limit

ML070670047
Person / Time
Site:	Quad Cities
Issue date:	03/19/2007
From:	Williams J NRC/NRR/ADRO/DORL/LPLIII-2
To:	Crane C Exelon Generation Co
Williams J, NRR/DLPM/LPD1, 415-1470
References
TAC MD4008
Download: ML070670047 (5)

Text

March 19, 2007 Mr. Christopher M. Crane President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

QUAD CITIES NUCLEAR POWER STATION, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO PROPOSED CHANGE TO MINIMUM CRITICAL POWER RATIO SAFETY LIMIT (TAC NO. MD4008)

Dear Mr. Crane:

On January 16, 2007, Exelon Generation Company, LLC submitted a letter requesting a change to the minimum critical power ratio safety limit for the Quad Cities Nuclear Power Station, Unit 1. The NRC staff is reviewing this request, and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter.

If you have questions regarding this topic, or if circumstances result in the need to revise the requested response date, please contact me at (301) 415-1470.

Sincerely,

/RA/

Joseph F. Williams, Senior Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-254

Enclosure:

Request for Additional Information cc w/encl: See next page

Mr. Christopher M. Crane March 19, 2007 President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

QUAD CITIES NUCLEAR POWER STATION, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO PROPOSED CHANGE TO MINIMUM CRITICAL POWER RATIO SAFETY LIMIT (TAC NO. MD4008)

Dear Mr. Crane:

On January 16, 2007, Exelon Generation Company, LLC submitted a letter requesting a change to the minimum critical power ratio safety limit for the Quad Cities Nuclear Power Station, Unit 1. The NRC staff is reviewing this request, and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter.

If you have questions regarding this topic, or if circumstances result in the need to revise the requested response date, please contact me at (301) 415-1470.

Sincerely,

/RA/

Joseph F. Williams, Senior Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-254 and 50-265

Enclosure:

Request for Additional Information cc w/encl: See next page Distribution:

PUBLIC RidsAcrsAcnwMailCenter LPL3-2 R/F RidsRgn3MailCenter RidsNrrDorlLpl3-2 RidsNrrDorlDpr RidsNrrLAEWhitt RidsNrrDssSbwb RidsNrrPMJWilliams BParks RidsOgcRp Accession Number: ML070670047 NRR-088 OFFICE PM:LPL3-2 LA:LPL3-2 BC:LPL3-2 NAME JWilliams:mw EWhitt RGibbs DATE 3/15/07 3/15/07 3/19/07 OFFICIAL RECORD COPY

Quad Cities Nuclear Power Station Units 1 and 2 cc:

Site Vice President - Quad Cities Illinois Emergency Management Exelon Generation Company, LLC Agency 22710 206th Avenue N. Division of Disaster Assistance &

Cordova, IL 61242-9740 Preparedness 110 East Adams Street Plant Manager - Quad Cities Nuclear Power Station Springfield, IL 62701-1109 Exelon Generation Company, LLC 22710 206th Avenue N. Document Control Desk - Licensing Cordova, IL 61242-9740 Exelon Generation Company, LLC 4300 Winfield Road Manager Regulatory Assurance - Quad Cities Warrenville, IL 60555 Exelon Generation Company, LLC 22710 206th Avenue N. Senior Vice President - Operations Support Cordova, IL 61242-9740 Exelon Generation Company, LLC 4300 Winfield Road Quad Cities Resident Inspectors Office Warrenville, IL 60555 U.S. Nuclear Regulatory Commission 22712 206th Avenue N. Director - Licensing and Regulatory Affairs Cordova, IL 61242 Exelon Generation Company, LLC 4300 Winfield Road David C. Tubbs Warrenville, IL 60555 MidAmerican Energy Company One River Center Place Vice President - Regulatory Affairs 106 E. Second, P.O. Box 4350 Exelon Generation Company, LLC Davenport, IA 52808-4350 4300 Winfield Road Warrenville, IL 60555 Vice President - Law and Regulatory Affairs MidAmerican Energy Company Associate General Counsel One River Center Place Exelon Generation Company, LLC 106 E. Second Street 4300 Winfield Road P.O. Box 4350 Warrenville, IL 60555 Davenport, IA 52808 Manager Licensing - Dresden, Quad Cities Chairman and Clinton Rock Island County Board of Supervisors Exelon Generation Company, LLC 1504 3rd Avenue 4300 Winfield Road Rock Island County Office Bldg. Warrenville, IL 60555 Rock Island, IL 61201 Senior Vice President - Midwest Operations Regional Administrator, Region III Exelon Generation Company, LLC U.S. Nuclear Regulaory Commission 4300 Winfield Road Suite 210 Warrenville, IL 60555 4300 Winfield Road Warrenville, IL 60555

REQUEST FOR ADDITIONAL INFORMATION QUAD CITIES NUCLEAR POWER STATION, UNIT 1 DOCKET NO. 50-254 REQUEST FOR TECHNICAL SPECIFICATIONS CHANGE MINIMUM CRITICAL POWER RATIO SAFETY LIMIT FOR CYCLE 20

1. Describe how the minimum critical power ratio safety limit (SLMCPR) analysis is conducted for legacy fuel. Discuss the burnup characteristics of modeled fuel type QAG4.

2. Fuel vendor documentation identifies a subset of legacy fuel, loaded in potentially limiting positions in the core, that was loaded in cycle 18A. Provide a comparison of predicted exposures of fuel loaded in cycles 18, 18A, and 19 at the start of QC1R20.

3. Provide the highest SLMCPR technical specification values for the legacy fuel for Quad Cities Unit 1.

4. Model assembly type QAG4 using the USAG14 correlation and provide assembly histograms through 10201 effective full power hours comparing the critical power ratio performance of the QAG4 bundles when modeled using D4.1.1 as compared to USAG14 to show that there is no significant impact of modeling with D4.1.1, which is not explicitly approved to model the lattice geometry contained in fuel assembly QAG4.

Enclosure