ML14115A441

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NRR E-mail Capture - Duane Arnold - LAR - TS Change Regarding Battery Terminal and Charger Voltage and Amperage - Request for Additional Information - MF2763
ML14115A441
Person / Time
Site: Duane Arnold NextEra Energy icon.png
Issue date: 04/24/2014
From: Mahesh Chawla
Division of Operating Reactor Licensing
To: Swenzinski L
Office of Nuclear Reactor Regulation
References
MF2763
Download: ML14115A441 (2)


Text

NRR-PMDAPEm Resource From: Chawla, Mahesh Sent: Thursday, April 24, 2014 3:06 PM To: laura.swenzinski@nexteraenergy.com; Davis, J.Michael (J.Michael.Davis@nexteraenergy.com)

Cc: Foli, Adakou; Martinez-Navedo, Tania; Mathew, Roy; Zimmerman, Jacob; Carlson, Robert; Phillips, Charles; Lipa, Christine; Haeg, Lucas; Steffes, Jakob

Subject:

Duane Arnold - LAR - TS Change regarding Battery Terminal and Charger Voltage and Amperage - Request for Additional Information - MF2763 By letter dated August 29, 2013 (Agencywide Document Access Management System Accession Number ML13247A275), Nextera Energy Duane Arnold, LLC (the licensee) requested an amendment to the Renewed Facility Operating License No. DPR-49 for the Duane Arnold Energy Center (DAEC). The proposed change would revise DAEC Technical Specifications (TS) Surveillance Requirements (SRs) 3.8.4.1 and 3.8.4.6 by changing the battery terminal voltage and the battery charger voltage and amperage to account for the replacement of the existing 58 cell batteries with new 60 cell batteries.

The NRC staff has reviewed the information provided by the licensee and has requested additional information as shown below. In order to complete our review, please provide your response to this request within 30 days of the receipt of this email. In case you need a clarification call with the staff, please contact me so we can arrange a teleconference. Thanks REQUEST FOR ADDITIONAL INFORMATION

1. On page 8 of the LAR, the licensee states: The sizing and voltage drop calculations results were valid for the 60-cell batteries with an aging factor of 125% and a minimum battery temperature of 18.3°C.

Reviews of sizing and voltage drop results for Station Blackout (SBO) and Small Break Loss of Coolant Accident (SBLOCA) revealed that all loads have adequate voltage and each battery has positive margin.

Provide a summary of the calculation, including assumptions and duty cycles, that was performed for the worst case design basis and SBO loading conditions to show that the batteries have adequate design and capacity margins and all loads have adequate voltage.

2. On page 5 of the LAR, the licensee stated that the impacts of the new equalizing voltage range of 2.28

- 2.29 volts per cell (Vpc) [which is below the manufacturer recommended nominal voltage range of 2.33 - 2.38 Vpc], were discussed with the manufacturer. In addition, the licensee stated that based on the manufacturers (C&D) letter, L. Carson to D. Pint, dated October 5, 2011, the slightly lower equalizing voltage per cell will not have a detrimental impact on the batteries.

Provide a copy of the manufacturers letter, L. Carson to D. Pint, dated October 5, 2011.

Mahesh Chawla Project Manager Phone: 301-415-8371 Fax: 301-415-1222 mahesh.chawla@nrc.gov 1

Hearing Identifier: NRR_PMDA Email Number: 1242 Mail Envelope Properties (Mahesh.Chawla@nrc.gov20140424150500)

Subject:

Duane Arnold - LAR - TS Change regarding Battery Terminal and Charger Voltage and Amperage - Request for Additional Information - MF2763 Sent Date: 4/24/2014 3:05:53 PM Received Date: 4/24/2014 3:05:00 PM From: Chawla, Mahesh Created By: Mahesh.Chawla@nrc.gov Recipients:

"Foli, Adakou" <Adakou.Foli@nrc.gov>

Tracking Status: None "Martinez-Navedo, Tania" <Tania.Martinez-Navedo@nrc.gov>

Tracking Status: None "Mathew, Roy" <Roy.Mathew@nrc.gov>

Tracking Status: None "Zimmerman, Jacob" <Jacob.Zimmerman@nrc.gov>

Tracking Status: None "Carlson, Robert" <Robert.Carlson@nrc.gov>

Tracking Status: None "Phillips, Charles" <Charles.Phillips@nrc.gov>

Tracking Status: None "Lipa, Christine" <Christine.Lipa@nrc.gov>

Tracking Status: None "Haeg, Lucas" <Lucas.Haeg@nrc.gov>

Tracking Status: None "Steffes, Jakob" <Jakob.Steffes@nrc.gov>

Tracking Status: None "laura.swenzinski@nexteraenergy.com" <laura.swenzinski@nexteraenergy.com>

Tracking Status: None "Davis, J.Michael (J.Michael.Davis@nexteraenergy.com)" <J.Michael.Davis@nexteraenergy.com>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 2409 4/24/2014 3:05:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: