ML081210175

Request for Additional Information Regarding TSTF-500, Rev. 0, DC Electrical Rewrite - Update to TSTF-360.

ML081210175
Person / Time
Site:	Technical Specifications Task Force
Issue date:	06/04/2008
From:	Robert Elliott NRC/NRR/ADRO/DIRS/ITSB
To:	Technical Specifications Task Force
Waig, Gerald, NRR 415-2260
References
TAC MD7221, TSTF-360, TSTF-500, Rev 0
Download: ML081210175 (4)

Text

June 4, 2008 Technical Specification Task Force (TSTF) 11921 Rockville Pike, Suite 100 Rockville, MD 20852

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION REGARDING TSTF-500, REVISION 0, DC ELECTRICAL REWRITE - UPDATE TO TSTF-360 (TAC NO. MD7221)

Dear Members of the TSTF,

By letter dated August 31, 2007 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML072430830), as supplemented by letter dated March 11, 2008 (ADAMS Accession No. ML080710396), the Technical Specifications Task Force (TSTF) requested the NRC to review TSTF-500, Revision 0, DC Electrical Rewrite - Update to TSTF-360.

The Nuclear Regulatory Commission (NRC) staff has reviewed the submittal and has determined that additional information is needed to complete its review. The specific questions are found in the enclosed Request for Additional Information (RAI). A response to this RAI is requested to be provided within 60 days.

Sincerely,

/RA/

Robert Elliott, Chief Technical Specifications Branch Division of Inspections & Regional Support Office of Nuclear Reactor Regulation

Enclosure:

RAI cc: See next page

ML080710396), the Technical Specifications Task Force (TSTF) requested the NRC to review TSTF-500, Revision 0, DC Electrical Rewrite - Update to TSTF-360.

The Nuclear Regulatory Commission (NRC) staff has reviewed the submittal and has determined that additional information is needed to complete its review. The specific questions are found in the enclosed Request for Additional Information (RAI). A response to this RAI is requested to be provided within 60 days.

Sincerely,

/RA/

Robert Elliott, Chief Technical Specifications Branch Division of Inspections & Regional Support Office of Nuclear Reactor Regulation

Enclosure:

RAI cc: See next page DISTRIBUTION:

ITSB R/F Nrr_Dirs_Itsb Distribution RidsNrrDirs RidsNrrDirsItsb RWolfgang RidsNrrDciCptb RidsNrrDeEeeb RidsNrrDciCsgb KParczewki AKlett ADAMS Accession No.: ML0081210175 OFFICE ITSB:DIRS BC:ITSB:DIRS BC:EEEB:DE NAME GWaig RElliott GWilson DATE 04/30/2008 06/4/2008 04/30/2008 Technical Specifications Task Force Mailing List cc:

Technical Specifications Task Force Donald R. Hoffman 11921 Rockville, Pike EXCEL Services Corporation Suite 100 11921 Rockville Pike, Suite 100 Rockville, MD 20852 Rockville, MD 20852 tstf@excelservices.com donaldh@excelservices.com George G. Yates Brian Mann AmerenUE Callaway Plant EXCEL Services Corporation Junction Hwy. CC and Hwy. O 11921 Rockville Pike, Suite 100 Mail Code CA-460 Rockville, MD 20852 P.O. Box 620 brianm@excelservices.com Fulton, MO 65251 gyates@ameren.com Jim Kenny 924 Liberty Street John Messina Emmaus, PA 18049 First Energy Nuclear Operating Company jken@ptd.net 76 South Main Street Mail Sto: Akron-GO-14 Akron, OH 44308 jmessina@firstenergycorp.com David Bice Entergy N-GSB64 Russellville, AR 72802 dbice@entergy.com Reene= V. Gambrell Duke Energy Mailcode: ON03RC 7800 Rochester Highway Seneca, SC 29672 RVGambrell@duke-energy.com

REQUEST FOR ADDITIONAL INFORMATION (RAI)

TSTF-500, REVISION 0, DC ELECTRICAL REWRITE - UPDATE TO TSTF-360

1. On page 14 of the August 31, 2007, submittal, the applicant stated that the float current requirements are based on the float current indicative of a charged battery. Define the term charged battery.

2. On page 17 of the August 31, 2007, submittal, the applicant stated that the [2] amp float current value is an indication that the battery is [95] percent charged Show that the Technical Specification float current value provides an indication that the battery is fully capable of performing its specified safety function.

3. Describe the methodology for determining the design margin (e.g., 5%) that must be maintained in order to utilize float current monitoring as an indication of a batterys state-of-charge.

4. Describe how licensees will show that the float current limit for determining a batterys state-of-charge will remain valid for future replacement batteries.

5. Describe how electrical isolation will be maintained in accordance with Regulatory Guide 1.75, Criteria for Independence of Electrical Safety Systems, between non-Class 1E and Class 1E circuits when an alternate means (i.e., non-Class 1E spare battery charger) is maintaining the charge on the Class 1E battery. If double isolation (e.g., two breakers in series, a breaker and a fuse, or a breaker supplied with a loss-of-offsite power signal) is not used, provide a detailed discussion on how a fault on the non-Class 1E electrical circuit will not propagate to the Class 1E electrical circuit.

6. On page 15 of the August 31, 2007, submittal, the TSTF stated that the minimum temperature necessary to support operability of the battery can vary depending on the available excess capacity of the associated battery. Describe the available excess capacity that is being credited.

Enclosure