ML062790242

RAI Related to Safety Limit Minimum Critical Power Ratio

ML062790242
Person / Time
Site:	Dresden
Issue date:	10/12/2006
From:	John Honcharik NRC/NRR/ADRO/DORL/LPLIII-2
To:	Crane C Exelon Generation Co
honcharik , J NRR/DORL, 415-1157
References
TAC MD2706
Download: ML062790242 (5)

Text

October 12, 2006Mr. Christopher M. Crane, President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

DRESDEN NUCLEAR POWER STATION, UNIT 3 - REQUEST FORADDITIONAL INFORMATION RELATED TO SAFETY LIMIT MINIMUM CRITICAL POWER RATIO (TAC NO. MD2706)

Dear Mr. Crane:

By letter to the Nuclear Regulatory Commission (NRC) dated July 21, 2006, Exelon GenerationCompany, LLC submitted a request to revise the technical specifications to provide a cycle-specific safety limit minimum critical power ratio (SLMPCR) for operation of DresdenNuclear Power Station (DNPS) Unit 3, Cycle 20.The NRC staff is reviewing your submittal and has determined that additional information isrequired to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on October 12, 2006, it was agreed that you would provide a response within 10 days from the date of this letter. The NRC staff considers that timely responses to requests for additional information helpensure sufficient time is available for staff review and contribute toward the NRC's goal ofefficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-1157.Sincerely,/RA R. Kuntz for/John Honcharik, Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No. 50-249

Enclosure:

Request for Additional Informationcc w/encl: See next page October 12, 2006Mr. Christopher M. Crane, President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

DRESDEN NUCLEAR POWER STATION, UNIT 3 - REQUEST FORADDITIONAL INFORMATION RELATED TO SAFETY LIMIT MINIMUM CRITICAL POWER RATIO (TAC NO. MD2706)

Dear Mr. Crane:

By letter to the Nuclear Regulatory Commission (NRC) dated July 21, 2006, Exelon GenerationCompany, LLC submitted a request to revise the technical specifications to provi de a cycle-specific safety limit minimum critical power ratio (SLMPCR) for operation of Dresden Nuclear Power Station (DNPS) Unit 3, Cycle 20.The NRC staff is reviewing your submittal and has determined that additional information isrequired to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on October 12, 2006, it was agreed that you would provide a response within 10 days from the date of this letter. The NRC staff considers that timely responses to requests for additional information helpensure sufficient time is available for staff review and contribute toward the NRC's goal ofefficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-1157.Sincerely,/RA R. Kuntz for/John Honcharik, Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No. 50-249

Enclosure:

Request for Additional Informationcc w/encl: See next pageDISTRIBUTION:PUBLICLPL3-2 R/FRidsNrrDorlLpl3-2 RidsNrrPMJHoncharikRidsNrrLADClarkeRidsAcrsAcnwMailCenter RidsOgcRpRidsRgn3MailCenterRidsNrrDorlDprRidsNrrDssSbwbBParks ADAMS Accession Number: ML062790242*Concurred via email 10/4/06.OFFICELPL3-2/PMLPL3-2/LA*SBWB/BCLPL3-2/BC NAMEJHoncharik;mw(RKuntz for)DClarkeGCranstonDCollinsDATE10/12/0610/12/200610/4/0610/12/06OFFICIAL RECORD COPY Dresden Nuclear Power Unit 3 cc:

Site Vice President - DresdenExelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765Plant Manager - Dresden Nuclear Power StationExelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765Manager Regulatory Assurance - DresdenExelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765U.S. Nuclear Regulatory CommissionDresden Resident Inspectors Office 6500 N. Dresden Road Morris, IL 60450-9766ChairmanGrundy County Board Administration Building 1320 Union Street Morris, IL 60450Regional Administrator, Region IIIU.S. Nuclear Regulatory Commission Suite 210 2443 Warrenville RoadLisle, IL 60532-4351Illinois Emergency Management Agency Division of Disaster Assistance &

Preparedness 110 East Adams Street Springfield, IL 62701-1109Document Control Desk - LicensingExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Senior Vice President - Midwest Operations Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Director - Licensing & Regulatory AffairsExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Vice President - Regulatory & Legal AffairsExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Assistant General CounselExelon Generation Company, LLC 200 Exelon Way Kennett Square, PA 19348Manager Licensing - DresdenExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 ENCLOSUREREQUEST FOR ADDITIONAL INFORMATIONSAFETY LIMIT MINIMUM CRITICAL POWER RATIODRESDEN NUCLEAR POWER STATION, UNIT 3DOCKET NO. 50-249In reviewing the Exelon Generation Company LLC's (Exelon's) submittal dated July 21, 2006,related to a request to revise the technical specifications to provide a cycle-specific safety limitminimum critical power ratio (SLMPCR) for operation of Dresden Nuclear Power Station, (DNPS) Unit 3, Cycle 20, the NRC staff has determined that the following information is neededin order to complete its review: 1.Section 2.0 of Attachment 4 to the July 21, 2006, submittal provides a justification onwhy the GE14 fuel analysis for Cycle 19 remains applicable and bounding for Cycle 20 operation. However, the NRC staff needs additional clarifying information concerninghow the fact that "the SLMCPR was established by contributions from GE14 fuel assemblies during Cycle 19" provides an adequate basis for concluding that the minimum critical power ratio for once-burned GE14 fuel assemblies remains valid.

(RAI Category 2.c) RAI CATEGORIES(Select only one, most dominant category for each RAI question)1.More information is needed because of:a. complexity of requestb. first-of-a-kind nature of request

c. NRC change in regulatory significance or focusd. NRC questions on previously used methodology or guidancee. licensee change to previously used methodology

f. licensee reduction in current safety margin2.The review can not be completed without additional explanation or clarification of:a. input variables or analytical assumptionsb. methodology used or results obtained

c. applicability or bounding nature of third party analyses or data correlationsd. differences from NRC guidance documents (SRP, RG, etc.)e. no significant hazards consideration discussion

f. environmental considerations discussion

g. applicable regulatory requirements discussion

h. information that appears to be incorrect and needs to be corrected

i. response to previous RAI appears inadequate3.Reviewer requesting information even though the question is, or the question asks for:a. not directly related to the requestb. inconsistent with applicable codes, standards, RGs, or SRP sections

c. information accessible from readily available sources and was explicitly referenced

d. information does not appear needed given the precedent cases discussed in the request

e. information that is not safety significant or pertinent to the regulatory findingf. information that is known to engineers who work in the general technical area

g. going beyond the current licensing basis and doesn't need to be asked

h. a formal commitment4.Other (please specify)