ML090090416

Request for Additional Information Pertaining to a License Amendment Request to Revise the 4160 Volt Bus Undervoltage (Degraded Voltage) Maximum Allowed Value

ML090090416
Person / Time
Site:	Duane Arnold
Issue date:	01/12/2009
From:	Feintuch K D Plant Licensing Branch III
To:	Anderson R L Florida Power & Light Co
Feintuch K D, NRR/DORL/LPL2-1, 415-3079
References
TAC MD8950
Download: ML090090416 (3)

Text

UNITED NUCLEAR REGULATORY WASHINGTON, D.C. 20555-0001 January 12, 2009 Mr. Richard L. Anderson Vice President Duane Arnold Energy Center 3277 DAEC Road Palo, IA 52324-9785 DUANE ARNOLD ENERGY CENTER -REQUEST FOR ADDITIONAL INFORMATION PERTAINING TO A LICENSE AMENDMENT REQUEST TO REVISE THE 4160 VOLT BUS UNDERVOL TAGE (DEGRADED VOLTAGE) MAXIMUM ALLOWED VALUE (TAC NO. MD8950)

Dear Mr. Anderson:

The Nuclear Regulatory Commission (!\IRC) staff is reviewing your application dated May 30, 2008, as supplemented by letter dated September 10, 2008, for the subject amendment. On November 28, 2008, the NRC staff transmitted a draft Request for Additional Information (RAI) and discussed the draft RAI with your staff in a conference call on January 9, 2009. Enclosed please find the final RAI, which is identical in content to the draft RAI. Your staff agreed that you can provide your response by January 22, 2009. Please feel free to contact me at 301-415-3079 if you need further clarification of the RAI.

Sincerely, Karl D. Feintuch, Project Manager Plant Licensing Branch 111-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. Request for Additional cc w/encls: Distribution via REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE REVISION OF THE 4160 VOLT BUS UNDERVOLTAGE (DEGRADED VOLTAGE) MAXIMUM ALLOWED VALUE (TAC NO. MD8950) DUANE ARNOLD ENERGY CENTER DOCKET NO. 50-331 By application dated May 30, 2008, (Agencywide Documents Access Management System (ADAMS) Accession No.

ML081630205), as supplemented by letter dated September 10, 2008, (ADAMS Accession No.

ML082600523), FPL Energy Duane Arnold, LLC proposed to change the maximum allowable value for the 4160-volt emergency bus undervoltage relays. The NRC staffs review of that application is ongoing, and has generated the following two questions for your response: Provide excerpts from documents which explain that the emergency bus voltage will recover to 95.5% (upper analytical value of degraded voltage relay) following the case design-basis accident. Confirm whether the worst-case scenario is when the maximum safety-related loads are fed from the standby transformer, whose tap setting was changed to get the transformer secondary voltage by approximately 2.8% (according to the Licensee Event Report No.

2007-10-00 dated January 29,2008). Provide the minimum switchyard voltage value and its basis assumed in the above requested document.

Enclosure January 12, 2009 Mr. Richard L. Anderson Vice President Duane Arnold Energy Center 3277 DAEC Road Palo, IA 52324-9785 DUANE ARNOLD ENERGY CENTER -REQUEST FOR ADDITIONAL INFORMATION PERTAINING TO A LICENSE AMENDMENT REQUEST TO REVISE THE 4160 VOLT BUS UNDERVOL TAGE (DEGRADED VOLTAGE) MAXIMUM ALLOWED VALUE (TAC NO.

MD8950)

Dear Mr. Anderson:

The Nuclear Regulatory Commission (NRC) staff is reviewing your application dated May 30, 2008, as supplemented by letter dated September 10,2008, for the subject amendment.

On November 28, 2008, the NRC staff transmitted a draft Request for Additional Information (RAI) and discussed the draft RAI with your staff in a conference call on January 9, 2009. Enclosed please find the final RAI, which is identical in content to the draft RAI. Your staff agreed that you can provide your response by January 22, 2009. Please feel free to contact me at 301-415-3079 if you need further clarification of the RAI.

Sincerely, IRAJ Karl D. Feintuch, Project Manager Plant Licensing Branch 111-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No.

Request for Additional cc w/encls:

Distribution via PUBLIC LPL3-1 rtf RidsNrrDorlLpl3-1 RidsNrrPMDuaneArnold Resource RidsNrrLABTully RidsOgcRp Resource RidsAcrsAcnw_MailCTR RidsNrrDirsltsb Resource RidsRgn3MailCenter RidsNrrDorlDpr Resource VGoel, KMiller, ADAMS ACCESSION NUMBER OFFICE NRR/LPL3-1/PM NRR/LPL3-1/LA NRR/LPL3-1/BC NAME KFeintuch BTul!y LJames DATE 01/12/09 01/12/09 01/12/09 OFFICIAL RECORD COpy