L-2016-220, License Amendment Request EDG Day Tank Fuel Volume Change

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License Amendment Request EDG Day Tank Fuel Volume Change
ML16342C570
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 12/05/2016
From: Constanzo C
Florida Power & Light Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2016-220
Download: ML16342C570 (2)
v • d • e


Text

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December 5, 2016 L-2016-220 10 CFR 50.90 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001

Subject:

St. Lucie Unit 2 Docket No. 50-389 License Amendment Request EDG Day Tank Fuel Volume Change References

1. FPL Letter L-2016-120 dated June 21, 2016, "License Amendment Request EDG Day Tank Fuel Volume Change" (ML16190Al 18)
  • 2. NRR E-mail Capture dated November 3, 2016 - Request for Additional Information - St.

Lucie EDG Day Tank LAR-MF8006 (ML16308A323)

In Reference 1, Florida Power & Light Company (FPL) submitted a request for an amendment to the Technical Specifications (TS) for St. Lucie Unit 2 to revise the minimum required emergency diesel generator day tank fuel volume to accommodate the reduced BTU/lb content in ultra low sulfur diesel (ULSD) fuel oil. In Reference 2, the NRC provided FPL with a request for

  • additional information (RAI). FPL's response to the RAI is contained in the attachment to this letter.

The RAI response is bounded by the original no hazards consideration of Refernce 1.

If you should have any questions, please contact Mr Michael Snyder at (772) 467-7036.

I declare under penalty of perjury that the foregoing is true and correct.

Executed on UJl-tJZ..M ~ 5 ).d-D\Jo Sincerely, Christopher R. Costanzo Site Vice President St. Lucie Plant Attachment cc: NRC Region II Administrator St. Lucie Plant NRC Senior Resident Inspector Ms. Cynthia Becker, Florida Department ofHealt Florida Power & Light Company 6501 S. Ocean Drive, Jensen Beach, FL 34957

L-201-6-220 Attachment Page 1 of 1 Request for Additional Information MF8006 Response RAl-MF8006-SBPB-01 In the LAR the licensee proposed to increase the minimum volume requirements for the day tanks from 200 gallons to 238 _gallons each. The proposed changes would be reflected in Technical Specification 3/4.8.1, limiting condition for operation 3.8.1.1 and 3.8.1.2. St. Lucie Unit 2 Updated Final Safety Analysis Report (UFSAR) Table 9.5-2, "Diesel Generator Fuel Oil System Instrumentation Application," last updated in UFSAR Amendment No. 12, indicates that the day tank level includes the following alarm and control functions:

1. Low level alarm that starts the transfer pump and opens the tank inlet valve.
2. High level alarm that closes the tank inlet valve and stops the transfer pump, but control

.J,. function can be overridden in manual mode .

3. High-high level alarm that closes the corresponding tank inlet valve.

Describe the relationship between the existing required day tank fuel oil volume and the tan!<

volume corresponding to the above tank level setpoints. Explain whether the increase in required fuel oil volume would change the relationship between the required volume and the setpoints, and provide justification for any change in the relationship.

Response

To facilitate use of Ultra Low Sulfur Diesel (ULSD) fuel, St. Lucie changed the setpoints for the Unit 2 .EOG Day Tank Level Switches as shown in Table 1 below. Corresponding to the Technical Specification level increase of 3.58 in., the Low-Low Switches were increased by 3 in.

and the Low Level Switch was increased by 3.25 in. The setpoints for the Hi-Hi and Hi Switches did not change.

Table 1: Day Tank Level Switch and Level Indicator Setpoints Level Switch/Indicator Function Original Setpoint C(urrent Setpoint, Setpoint which was changed to Difference allow use of ULSD Hi-H- Alarm 2N2B EDG Ann. 5-4 Backup Close 33.5 in. 33.5 in. Same Fuel Suooly Valve Hi Level Stop Fuel Transfer Pump & Close Fuel 32.5 in. 32.5 in. Same Supply Valve Low Level Start Fuel Transfer Pump & Open Fuel 22.5 in. 25.75 in. +3.25 in.

Supplv Valve Low-Low Alarm -2N2B EDG Ann. 5-3 21.0 in. 24.0 in. + 3 in.

Low-Low Alarm- Ann. LA-9/LB-9 21.0 in. 24.0 in. + 3 in.

Technical Specification Min Level 20.1 in. (200 gal) 23.68 in.** (23~ gal) + 3.58 in.

Proposed Technical Specification

    • Proposed Technical Specification minimum level includes an allowance of 2 inches for instrument uncertainty.
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