ML110550011

EPU - Request for Additional Information (I&C)

ML110550011
Person / Time
Site:	Saint Lucie
Issue date:	02/24/2011
From:	Orf T Plant Licensing Branch II
To:	Wasik C Florida Power & Light Co
Orf, T J, NRR/DORL/301-415-2788
References
Download: ML110550011 (2)

Text

From: Orf, Tracy Sent: Thursday, February 24, 2011 7:09 AM To: 'Wasik, Chris'

Subject:

St. Lucie Unit 1 EPU - request for additional information (I&C)

Dear Mr. Wasik,

By letter dated November 22, 2010 (Agencywide Documents Access and Management System Accession No. ML103560415) Florida Power & Light Company (the licensee) submitted a license amendment request for St. Lucie Unit 1.

The U.S. Nuclear Regulatory Commission (NRC) staff has reviewed the licensee's submittal and has concluded that additional information is required from the licensee in order for the NRC staff to complete their review. The questions below describe these requests for additional information (RAls).

The NRC requests that the licensee respond to these RAls within 30 days of the date of this e-mail. If the licensee concludes that more than 30 days are required to respond to the RAls, the licensee should request additional time, including a basis for why the extension is needed.

Please contact me at the number below or by e-mail if you have any questions on this issue or if you require additional time to submit your responses.

Sincerely, Tracy J. Orf, Project Manager St. Lucie Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Phone: (301) 415-2788 The following questions refer to the file Att 5 EPU Licensing Report_np.pdf of St Lucie Nuclear Power Plant Unit 1 (St. Lucie Unit 1) licensing EPU Compact Disc (LAR L-2010-259).

EICB-1 Page 2.4.4-15, Table 2.4.4-1 indicates that the steam enthalpy uncertainty is 0.0225% by pressure and 0.0087% by moisture carryover. The sum of these two values (0.0312%) is less than the minimum uncertainty value [0.07%] listed in the ER-157P, Revision 5, which assumed zero moisture carryover. What assumptions are made and what is the value of steam quality used in the calorimetric uncertainty calculation? Explain and justify why the uncertainty value of steam enthalpy is conservative in the calorimetric uncertainty calculation with your steam quality assumption.

EICB-2. In page 2.4.4-7,Section I.5 Out of Service Requirements, the licensee stated that allowed outage time [AOT] with the Cameron LEFM CheckPlus system out of service (OOS) will be 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> provided steady-state conditions persist. The licensee then described the LEFM CheckPlus system uncertainties under two

conditions with LEFM system failure (with 0.46% and 0.5% uncertainties in page 2.4.4-9) and stated If the 48-hour outage period is exceeded, then the plant will operate at a power level consistent with the accuracy of the alternate plant instruments in page 2.4.4-10.

a. Provide a list of all OOS conditions in detail.

b. Clarify that you have same AOT (48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />) with all OOS conditions, and will restrict plant power to less than or equal to 2968 MWt (98.30% of the proposed licensed power) if the plant experience a power change of greater than 10% during the 48-hour AOT period.

c. Provide detail information (prefer with a table) with the proposed licensed power percentage and maximum MWt under each OOS conditions after the 48-hour outage period is exceeded.

EICB-3. First paragraph in page 2.4.4-7 addresses NRC RIS 2002-03 item I.1.F.ii controlling software and hardware configuration. However, the licensee only describes the hardware and software configuration program of the Cameron LEFM CheckPlus system. Provide a brief description of your configuration programs and address how you control the hardware and software configuration at the plant.