ND-23-0349, ITAAC Closure Notification on Completion of ITAAC Item 2.1.02.08b (Index Number 30)

ITAAC Closure Notification on Completion of ITAAC Item 2.1.02.08b (Index Number 30)

ML23125A126
Person / Time
Site:	Vogtle
Issue date:	05/05/2023
From:	Coleman J Southern Nuclear Operating Co
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
ND-23-0349
Download: ML23125A126 (1)

Text

Jamie M. Coleman Regulatory Affairs Director Vogtle 3 & 4 7825 River Road Waynesboro, GA 30830 706-848-6926 May 5, 2023 Docket No.:

52-026 ND-23-0349 10 CFR 52.99(c)(1)

U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Southern Nuclear Operating Company Vogtle Electric Generating Plant Unit 4 ITAAC Closure Notification on Completion of ITAAC Item 2.1.02.08b [Index Number 30]

Ladies and Gentlemen:

In accordance with 10 CFR 52.99(c)(1), the purpose of this letter is to notify the Nuclear Regulatory Commission (NRC) of the completion of Vogtle Electric Generating Plant (VEGP) Unit 4 Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC) Item 2.1.02.08b [Index Number 30].

This ITAAC confirms the Reactor Coolant Pumps provide Reactor Coolant System flow coastdown on loss of power to the pumps. The closure process for this ITAAC is based on the guidance described in Nuclear Energy Institute (NEI) 08-01, "Industry Guideline for the ITAAC Closure Process under 10 CFR Part 52," which was endorsed by the NRC in Regulatory Guide 1.215.

This letter contains no new NRC regulatory commitments. Southern Nuclear Operating Company (SNC) request NRC staff confirmation of this determination and publication of the required notice in the Federal Register per 10 CFR 52.99.

If there are any questions, please contact Kelli A. Roberts at 706-848-6991.

Respectfully submitted, Jamie M. Coleman Regulatory Affairs Director Vogtle 3 & 4

Enclosure:

Vogtle Electric Generating Plant (VEGP) Unit 4 Completion of ITAAC 2.1.02.08b [Index Number 30]

JMC/TL/sfr

U.S. Nuclear Regulatory Commission ND-23-0349 Page 2 of 2 cc:

Regional Administrator, Region ll Director, Office of Nuclear Reactor Regulation (NRR)

Director, Vogtle Project Office NRR Senior Resident Inspector - Vogtle 3 & 4

U.S. Nuclear Regulatory Commission ND-23-0349 Enclosure Page 1 of 4 Southern Nuclear Operating Company ND-23-0349 Enclosure Vogtle Electric Generating Plant (VEGP) Unit 4 Completion of ITAAC 2.1.02.08b [Index Number 30]

U.S. Nuclear Regulatory Commission ND-23-0349 Enclosure Page 2 of 4 ITAAC Statement Design Commitment 8.b) The RCPs have a rotating inertia to provide RCS flow coastdown on loss of power to the pumps.

Inspections, Tests, Analyses A test will be performed to determine the pump flow coastdown curve.

Acceptance Criteria The pump flow coastdown will provide RCS flows greater than or equal to the flow shown in Figure 2.1.2-2, Flow Transient for Four Cold Legs in Operation, Four Pumps Coasting Down.

ITAAC Determination Basis Testing was performed in accordance with Unit 4 preoperational test procedure 4-RCS-ITPP-506 (Reference 1) using Work Order 1192131 (Reference 2) to confirm that the pump flow coastdown will provide Reactor Coolant System (RCS) flows greater than or equal to the flow shown in Figure 2.1.2-2, Flow Transient for Four Cold Legs in Operation, Four Pumps Coasting Down.

The testing established the RCS at approximately 557°F and 2240 psig with all 4 Reactor Coolant Pumps (RCPs) at 100% speed for a minimum of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> to ensure thermal stability.

Data acquisition recorders were started and utilized to monitor RCP breaker status and RCS flow data then all 4 RCPs were tripped simultaneously. Data was collected for 10 minutes after all 4 RCPs speed indicate 0 revolutions per minute. An evaluation (Reference 4) was documented in reference 1 and 3 and demonstrated that for Unit 4 the pump flow coastdown provided RCS flows greater than or equal to the flow shown in Figure 2.1.2-2, Flow Transient for Four Cold Legs in Operation, Four Pumps Coasting Down.

References 1 through 4 are available for NRC inspection as part of Unit 4 ITAAC 2.1.02.08b Completion Package (Reference 5).

ITAAC Finding Review In accordance with plant procedures for ITAAC completion, Southern Nuclear Operating Company (SNC) performed a review of findings pertaining to the subject ITAAC and associated corrective actions. This review found there are no relevant ITAAC findings associated with this ITAAC. The ITAAC completion review is documented in the ITAAC Completion Package for ITAAC 2.1.02.08b (Reference 5) and is available for NRC review.

ITAAC Completion Statement Based on the above information, SNC hereby notifies the NRC that ITAAC 2.1.02.08b was performed for VEGP Unit 4 and that the prescribed acceptance criteria were met.

U.S. Nuclear Regulatory Commission ND-23-0349 Enclosure Page 3 of 4 Systems, structures, and components verified as part of this ITAAC are being maintained in their as-designed, ITAAC compliant condition in accordance with approved plant programs and procedures.

References (available for NRC inspection)

1. 4-RCS-ITPP-506, Rev. 0, Reactor Coolant Pump and Reactor Coolant Flow Precore Hot Functional

2. SV4-RCS-T0W-1192131, Rev. 0, Perform Pre-Op Test 4-RCS-ITPP-506

3. SV4-RCS-ITR-800030, Rev. 0, Unit 4 Recorded Results of RCS Flow Coastdown Measurement Test: ITAAC 2.1.02.08b

4. SV4-RCS-T2C-5063, Rev. 0, Vogtle Unit 4 RCS Flow Coastdown Preoperational Testing Results Validation

5. 2.1.02.08b-U4-CP-Rev0, ITAAC Completion Package

U.S. Nuclear Regulatory Commission ND-23-0349 Enclosure Page 4 of 4