ML14216A072

Request for Additional Information - LAR 231 (TACs MF4392 and MF4393)

ML14216A072
Person / Time
Site:	Turkey Point
Issue date:	07/28/2014
From:	Audrey Klett Plant Licensing Branch II
To:	Tomonto R Florida Power & Light Co
References
MF4392, MF4393
Download: ML14216A072 (3)

Text

1 NRR-PMDAPEm Resource From: Klett, Audrey Sent: Monday, July 28, 2014 3:53 PM To: Tomonto, Bob (Bob.Tomonto@fpl.com); Czaya, Paul (Paul.Czaya@fpl.com); 'Hanek, Olga' (Olga.Hanek@fpl.com)

Cc: Cross, William (WILLIAM.CROSS@fpl.com)

Subject:

Turkey Point 3 and 4 Request for Additional Information - LAR 231 (TACs MF4392 and MF4393)By letter dated July 10, 2014, as supplemented by letters dated July 17, July 22, July 24, and July 26, 2014, Florida Power & Light Company (the licensee) submitted a license amendment request for the Turkey Point Nuclear Generating Unit Nos. 3 and 4 (Turkey Point). The licensee requested revisions to the Turkey Point Technical Specifications (TSs), Section 3/4.7.4, "Ultimate Heat Sink [UHS]."

The U.S. Nuclear Regulatory Commission (NRC) staff re viewed the information provided by the licensee and determined that it needs additional information to complete the review. The NRC staff's request for additional information (RAI) is as follows.

SCVB RAI-4 Please describe the changes that will be included in the UFSAR related to the license amendment request (e.g., regarding maintaining the component cooling water heat exchangers so that they are ready and capable of functioning as intended during normal and accident conditions).

BOP RAI-7 The licensee's response to BOP RAI-1 states that the input to HX3/HX4 is TICW in, TICW out , TCCW in, TCCW out, and intake cooling water (ICW) Flow Rate.

The licensee's response also states that "The HX3/HX4 program equates the heat gain by the ICW system, the heat loss from CCW [component cooling water] and then determines the overall heat transfer coefficient, 'U',

based on the surveillance heat transfer rate and logarithmic mean temperature difference. The HX3/HX4 program determines the TR [tube resistance] based on the surveillance overall heat transfer coefficient 'U', first principle equations and appropriate film coefficients."

When doing the surveillances, Q is unknown.

Equations:

1. QICW= (MICW) (CP ICW) (TICW out - TICW in)

2. QCCW = (MCCW) (CP CCW) (TCCW in -TCCW out) 3. Q = U 0 (A) LMTD

4. Q= QICW = QCCW Where:

QICW = Heat Gain to ICW from CCW CP ICW = ICW Specific Heat MICW = ICW Mass Flow Rate TICW out = ICW Outlet Temperature TICW in = ICW Inlet Temperature QCCW = Heat Loss from CCW to ICW MCCW = CCW Mass Flow Rate CP CCW = CCW Specific Heat TCCW in = CCW Inlet Temperature TCCW out = CCW Outlet Temperature 2 U 0 = Overall Heat Transfer Coefficient A = Total Tube Exterior Surface Area LMTD = log mean temperature differential Variables that are underlined are known.

Q is needed to get U 0, which is needed to get TR (tube resistance), so that one can accurately enter Figure 3.5-1 of the licensee's letter dated July 10, 2014, or the graphs of HX3/HX4. The unknowns are Q, CP ICW, MCCW, and U0. Considering equations 1, 2, and 3, there are 3 equations and 4 unknowns.

A. How does the licensee know the value of U 0? B. When the licensee knows the value of U 0, how does it find TR knowing that the tube side film coefficient is affected by the algae?

C. How does the licensee know it has the correct TR when doing surveillances and thus is able to know that there is sufficient heat transfer capability for a design basis accident?

BOP RAI-8 In its response to BOP RAI-6 by letter dated July 26, 2014, the licensee stated, "The RHR [residual heat removal] Pump mechanical seals are cooled by CCW [component cooling water] through mechanical seal coolers with process fluid on the tube side and CCW water on the shell side. Per Drawing 5610-M-450-96, Sheet 1, CCW is to be available at 145ºF [degrees Fahrenheit] initially, decreasing to 125ºF in 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />."

The licensee also stated, "The CS [containment spray] Pump mechanical seal is cooled by CCW through a mechanical seal cooler. The maximum operating temperature for the Containment Spray Pump mechanical seal is 205ºF. Per the vendor data sheets for the mechanical seals on the Unit 4 CS pumps, 3 gpm [gallons per minute] of flow at 150ºF is needed for the CS pump seal coolers."

However, the peak CCW supply temperature to the RHR and CS pumps during a loss-of-coolant accident, double-ended pump suction (LOCA-DEPS) break approac hes 160°F and stays above 150°F for several hours after the accident, according to the licensee's letter dated July 24, 2014. The CCW supply temperature appears to be too high to meet the vendor-specified cooling requirements for these pumps. Discuss how the

RHR and CS pumps will have adequate cooling to run conti nuously in order to perform their design basis function during a design basis accident.

Audrey Klett Project Manager NRR/DORL/LPLII-2

301-415-0489

Hearing Identifier: NRR_PMDA Email Number: 1465 Mail Envelope Properties (Audrey.Klett@nrc.gov20140728155200)

Subject:

Turkey Point 3 and 4 Request for Additional Information - LAR 231 (TACs MF4392 and MF4393) Sent Date: 7/28/2014 3:52:53 PM Received Date: 7/28/2014 3:52:00 PM From: Klett, Audrey Created By: Audrey.Klett@nrc.gov Recipients: "Cross, William (WILLIAM.CROSS@fpl.com)" <WILLIAM.CROSS@fpl.com> Tracking Status: None "Tomonto, Bob (Bob.Tomonto@fpl.com)" <Bob.Tomonto@fpl.com> Tracking Status: None "Czaya, Paul (Paul.Czaya@fpl.com)" <Paul.Czaya@fpl.com>

Tracking Status: None "'Hanek, Olga' (Olga.Hanek@fpl.com)" <Olga.Hanek@fpl.com> Tracking Status: None

Post Office: Files Size Date & Time MESSAGE 4613 7/28/2014 3:52:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received: