ML12065A296
| ML12065A296 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 03/05/2012 |
| From: | Jason Paige Plant Licensing Branch II |
| To: | Hanek O, Tomonto B Florida Power & Light Co |
| References | |
| TAC ME6859, TAC ME6860 | |
| Download: ML12065A296 (3) | |
Text
1 NRR-PMDAPEm Resource From:
Paige, Jason Sent:
Monday, March 05, 2012 8:06 AM To:
Tomonto, Bob; Hanek, Olga
Subject:
Turkey Point Units 3 and 4 - DC Sources LAR - Request for Additional Information (ME6859/60)
- Bob, By letter dated August 10, 2011 (Agencywide Documents Access and Management System (ADAMS)
Accession No. ML11227A006), Florida Power and Light (FPL, the licensee) requested an amendment to Facility Operating License Nos. DPR-31 and DPR-41 for Turkey Point (TPN) Units 3 and 4. The proposed amendment would revise the Technical Specification (TS) Surveillance Requirements (SR) relating to Direct Current Sources. Specifically, the proposed changes would modify SR 4.8.2.1 pertaining to periodic verification of battery bank capacity, and battery intercell and connection resistance.
Below are requests for additional information (RAIs) regarding the Turkey Point DC sources license amendment request. On March 1, 2012, you stated that a call is not needed to discuss the draft RAIs sent to you via email. The below RAIs reflect the questions that were sent to you and agreed upon by FPL.
The Electrical Engineering Branch requests the following additional information:
- 1. In the license amendment request (LAR), the licensee stated that each battery is sized to provide power to its loads for two hours during a design basis accident concurrent with a Loss of Offsite Power (LOOP) without terminal voltage falling below the required voltage. The capability of the safety-related batteries to provide required power is demonstrated by the performance of 30 minute service and 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> performance tests. The 30 minute service testing time is based on the time required to manually load a charger during a station blackout event.
According to NRC Standard TS NUREG-1431, Section 3.8.4, the service test should cover the design duty cycle. Since, the battery is sized for two hours duration to ensure continued operation of equipment following a design basis accident concurrent with a LOOP, the staff position is that the service test is required to be performed for two hours to demonstrate that the design duty cycle can be met consistent with the intent of the TS. The licensee should either demonstrate that 30 minute station blackout duty cycle loads are more conservative than the two hours design basis duty cycle loads or modify the service test duration to two hours to the meet the intent of the TS. The modification should include revision to the UFSAR [Updated Final Safety Analysis Report] and TS Bases.
- 2. In the LAR, the licensee stated that the requested TS SR revised battery cell connection resistance values are based on past battery surveillances measured resistance values for clean, tight battery cell connections plus a small margin (5 to 7 micro-ohms, approximately 20%).
Provide the results of at least two past battery surveillances showing the measured resistance values.
- 3. In the LAR, the licensee stated that the TS SR total battery connection resistance limit, derived from the summation of the individual battery inter-cell and transition connections resistance values for the respective battery, is enveloped by the battery load and voltage calculation.
Provide the excerpt from the battery load and voltage calculation which shows the total battery connection resistance limit considered in the calculation.
2
- 4. In the LAR, the licensee stated that the vendor's typical expected battery life curve indicates a 100%
battery capacity over the initial 14 years.
Provide the basis and any supporting documents to confirm the above statement.
- 5. In the LAR, the licensee stated that an aging factor of 1.15 (115%) essentially reduces the battery service life to 18.6 years during which time the battery would have sufficient capacity to provide 100%
of the power requirements for the design load.
Provide the basis and summary of the supporting calculation to confirm the above statement.
Jason Paige, Turkey Point Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation US Nuclear Regulatory Commission Phone: (301) 415-5888
Hearing Identifier:
NRR_PMDA Email Number:
290 Mail Envelope Properties (Jason.Paige@nrc.gov20120305080500)
Subject:
Turkey Point Units 3 and 4 - DC Sources LAR - Request for Additional Information (ME6859/60)
Sent Date:
3/5/2012 8:05:34 AM Received Date:
3/5/2012 8:05:00 AM From:
Paige, Jason Created By:
Jason.Paige@nrc.gov Recipients:
"Tomonto, Bob" <Bob.Tomonto@fpl.com>
Tracking Status: None "Hanek, Olga" <Olga.Hanek@fpl.com>
Tracking Status: None Post Office:
Files Size Date & Time MESSAGE 4121 3/5/2012 8:05:00 AM Options Priority:
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