ML061240396
| ML061240396 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 05/24/2006 |
| From: | Spaulding D Plant Licensing Branch III-2 |
| To: | Vanmiddlesworth G Nuclear Management Co |
| spalding D, NRR/DORL/LPD3-1, 415-2928 | |
| References | |
| TAC MC8343 | |
| Download: ML061240396 (4) | |
Text
May 24, 2006 Mr. Gary Van Middlesworth Vice President Duane Arnold Energy Center 3277 DAEC Road Palo, Iowa 52324-9785
SUBJECT:
DUANE ARNOLD ENERGY CENTER - REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE PROPOSED AMENDMENT TO REVISE THE SURVEILLANCE REQUIREMENTS FOR THE EMERGENCY DIESEL GENERATORS TO PROVIDE MORE MARGIN TO THE ACCEPTANCE CRITERION (TAC NO. MC8343)
Dear Mr. Van Middlesworth:
Your letter of September 16, 2005, submitted a proposed amendment to revise the surveillance requirements for the emergency diesel generators to provide more margin to the acceptance criterion at the Duane Arnold Energy Center.
We are reviewing this information, and find that we need additional information as shown in the enclosed request for additional information (RAI). Telephone conference calls were held on May 3, 2006, and May 18, 2006, to discuss this RAI. The Nuclear Regulatory Commission requests your response by June 16, 2006. Please contact me at (301) 415-2928 if you have questions.
Sincerely, Deirdre W. Spaulding, Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-331
Enclosure:
RAI cc w/encl: See next page
Mr. Gary Van Middlesworth Vice President Duane Arnold Energy Center 3277 DAEC Road Palo, Iowa 52324-9785
SUBJECT:
DUANE ARNOLD ENERGY CENTER - REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE PROPOSED AMENDMENT TO REVISE THE SURVEILLANCE REQUIREMENTS FOR THE EMERGENCY DIESEL GENERATORS TO PROVIDE MORE MARGIN TO THE ACCEPTANCE CRITERION (TAC NO. MC8343)
Dear Mr. Van Middlesworth:
Your letter of September 16, 2005, submitted a proposed amendment to revise the surveillance requirements for the emergency diesel generators to provide more margin to the acceptance criterion.
We are reviewing this information, and find that we need additional information as shown in the enclosed request for additional information (RAI). Telephone conference calls were held on May 3, 2006, and May 18, 2006, to discuss this RAI. The Nuclear Regulatory Commission requests your response by June 16, 2006. Please contact me at (301) 415-2928 if you have questions.
Sincerely, Deirdre W. Spaulding, Project Manager /RA/
Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-331
Enclosure:
RAI cc w/encl: See next page DISTRIBUTION:
PUBLIC LPL3-1 R/F RidsNrrPMDSpaulding RidsNrrLATHarris RidsNrrDorlLpl3-1 RidsOgcRp RidsAcrsAcnwMailCenter RidsRgn3MailCenter RidsNrrDorlDpr KCorp GWilson ADAMS Accession Number: ML061240396 OFFICE NRR/LPL3-1/PM NRR/LPL3-1/LA NRR/LPL3-1/BC NAME DSpaulding THarris LRaghavan DATE 05/24/06 05/23/06 05/24/06 OFFICIAL RECORD COPY
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THREE RELIEF REQUESTS ASSOCIATED WITH THE PROPOSED AMENDMENT TO REVISE THE SURVEILLANCE REQUIREMENTS FOR THE EMERGENCY DIESEL GENERATORS TO PROVIDE MORE MARGIN TO THE ACCEPTANCE CRITERION DUANE ARNOLD ENERGY CENTER DOCKET NO. 50-331 Your letter of September 16, 2005, submitted a proposed amendment to revise the surveillance requirements for the emergency diesel generators (EDGs) to provide more margin to the acceptance criterion. You stated that the proposed change in EDG testing acceptance criteria is fully consistent with Safety Guide 9, Selection of Diesel Generator Set Capacity for Standby Power Supplies. Updated Final Safety Analysis Report, Section 1.8.9, states that the voltage will recover to 90 percent of rated voltage after each step-load change in 1.3 sec (26.0 percent of load sequence time interval) or less and to 98 percent of rated frequency within 3.91 second (78.2 percent of load sequence time interval). However, Safety Guide 9 recommends that voltage should be restored to within 10 percent of nominal and frequency should be restored to within 2 percent of nominal in less than 40 percent of each load-sequence time interval. Thus, the frequency is not restored to within 2 percent of nominal until the motors have almost accelerated to rated speed.
To complete its review of the submittal, the Nuclear Regulatory Commission staff requests the following additional information. Please provide justification for using a greater percentage of the time interval to restore the proposed frequency within 2 percent of nominal (60 Hz). Also, please confirm that problems regarding meeting the EDG testing acceptance criteria have not been observed in past EDG performance.
ENCLOSURE
Duane Arnold Energy Center cc:
Mr. J. A. Stall Senior Nice President, Nuclear and Chief Nuclear Officer Florida Power & Light Company P. O. Box 14000 Juno Beach, FL 33408-0420 Mr. M. S. Ross Managing Attorney Florida Power & Light Company P. O. Box 14000 Juno Beach, FL 33408-0420 Mr. R. E. Helfrich Senior Attorney Florida Power & Light Company P. O. Box 14000 Juno Beach, FL 33408-0420 Mr. W. E. Webster Vice President, Nuclear Operations Florida Power & Light Company P. O. Box 14000 Juno Beach, FL 33408-0420 John Bjorseth Site Director Duane Arnold Energy Center 3277 DAEC Road Palo, IA 52324 Steven R. Catron Manager, Regulatory Affairs Duane Arnold Energy Center 3277 DAEC Road Palo, IA 52324 U. S. Nuclear Regulatory Commission Resident Inspectors Office Rural Route #1 Palo, IA 52324 Regional Administrator, Region III U.S. Nuclear Regulatory Commission Suite 210 2443 Warrenville Road Lisle, IL 60532-4351 Mr. M. Warner Vice President, Nuclear Operations Support Florida Power & Light Company P. O. Box 14000 Juno Beach, FL 33408-0420 Mr. D. A. Curtland Plant Manager Duane Arnold Energy Center 3277 DAEC Rd.
Palo, IA 52324-9785 Mr. R. S. Kundalkar Vice President, Nuclear Engineering Florida Power & Light Company P. O. Box 14000 Juno Beach, FL 33408-0420 Daniel McGhee Utilities Division Iowa Department of Commerce Lucas Office Buildings, 5th Floor Des Moines, IA 50319 Chairman, Linn County Board of Supervisors 930 1st Street SW Cedar Rapids, IA 52404 February 1, 2006