ND-22-0645, ITAAC Closure Notification on Completion of ITAAC 2.2.03.08c.i.01 (Index Number 177)
| ML22287A118 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 10/14/2022 |
| From: | Coleman J Southern Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| ND-22-0645 | |
| Download: ML22287A118 (5) | |
Text
A Southern Nuclear OCT 1 4 2022 Docket No.:
52-026 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Jamie M. Coleman Regulatory Affairs Director Vogtle 3 & 4 Southern Nuclear Operating Company Vogtle Electric Generating Plant Unit 4 7825 River Road Waynesboro, GA 30830 706-848-6926 tel ND-22-0645 10 CFR 52.99(c)(1)
ITAAC Closure Notification on Completion of ITAAC 2.2.03.08c.i.01 [Index Number 177)
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 2.2.03.08c.i.01
[Index Number 177), for verifying the Core Makeup Tank injection line flow resistance values.
The closure process for this ITAAC is based on the guidance described in NEI 08-01, "Industry Guideline for the ITAAC Closure Process under 10 CFR Part 52", which is endorsed by the NRC in Regulatory Guide 1.215.
This letter contains no new NRG regulatory commitments. Southern Nuclear Operating Company (SNC) requests 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 Roberts at 706-848-6991.
Respectfully submitted,
~~ ~~
Jamie M. Coleman Regulatory Affairs Director Vogtle 3 & 4
Enclosure:
JMC/DLW/sfr Vogtle Electric Generating Plant (VEGP) Unit 4 ITAAC Closure Notification on Completion of ITAAC 2.2.03.08c.i.01 [Index Number 177)
U.S. Nuclear Regulatory Commission ND-22-0645 Page 2 of 2 cc:
Regional Administrator, Region II Director, Office of Nuclear Reactor Regulation (NRR)
Director, Vogtle Project Office NRR Senior Resident Inspector - Vogtle 3 & 4
U.S. Nuclear Regulatory Commission ND-22-0645 Enclosure Page 1 of 3 Southern Nuclear Operating Company ND-22-0645 Enclosure Vogtle Electric Generating Plant (VEGP) Unit 4 ITAAC Closure Notification on Completion of ITAAC 2.2.03.0Bc.i.01 [Index Number 177]
U.S. Nuclear Regulatory Commission ND-22-0645 Enclosure Page 2 of 3 IT AAC Statement Design Commitment 8.c) The PXS provides RCS makeup, boration, and safety injection during design basis events.
Inspections/Tests/ Analyses i) A low-pressure injection test and analysis for each CMT, each accumulator, each IRWST injection line, and each containment recirculation line will be conducted. Each test is initiated by opening isolation valve(s) in the line being tested. Test fixtures may be used to simulate squib valves.
- 1. CMTs:
Each CMT will be initially filled with water. All valves in these lines will be open during the test.
Acceptance Criteria i) The injection line flow resistance from each source is as follows:
- 1. CMTs:
The calculated flow resistance between each CMT and the reactor vessel is~ 1.81 x 10-5 ft/gpm2 and::; 2.25 x 10-5 ft/gpm2.
IT AAC Determination Basis Multiple IT AAC were performed to verify that the Passive Core Cooling System (PXS) provided Reactor Coolant System (RCS) makeup, boration, and safety injection during design basis events. This IT AAC performed a low pressure injection test and analysis for each Core Makeup Tank (CMT) (PXS-MT-02A/B) by calculating the flow resistance of each injection line.
Performance tests were conducted in accordance with the Unit 4 preoperational test procedure 4-PXS-ITPP-506 (Reference 1) to demonstrate that the flow path from each Unit 4 CMT to the reactor vessel had a flow resistance~ 1.81 x 10-5 ft/gpm2 and::; 2.25 x 10-5 ft/gpm2.
Each CMT was initially filled with water while measuring the volume of water added and tank level to establish a volume verses level correlation. The test was accomplished by opening both associated CMT discharge isolation valves and gravity draining each tank through the Direct Vessel Injection (DVI) flow path with all valves in these lines open, while measuring the CMT level during the test period. The constant value for flow resistance was calculated based on the test duration, total head loss and total volume change from the change in measured tank level and adjusted for measurement uncertainty.
U.S. Nuclear Regulatory Commission ND-22-0645 Enclosure Page 3 of 3 The Unit 4 flow resistance was calculated to be 2.02 x 10-5 ft/gpm 2 for the CMT A, PXS-MT-02A, flow path and 2.06 x 10-5 ft/gpm2 for the CMT B, PXS-MT-02B, flow path (References 3 and 4).
The Unit 4 test results were documented in Reference 2 and confirm that the calculated injection line flow resistance between each CMT and the reactor vessel was~ 1.81 x 10-5 ft/gpm 2 and :5 2.25 x 10-5 ft/gpm 2.
References 1 through 4 are available for NRC inspection as part of the Unit 4 ITAAC 2.2.03.08c.i.01 Completion Package (Reference 5).
List of ITAAC Findings In accordance with plant procedures for ITAAC completion, Southern Nuclear Operating Company (SNC) performed a review of all findings pertaining to the subject IT AAC and associated corrective actions. This review found there were no relevant ITAAC findings associated with this ITAAC. The ITAAC completion review is documented in the ITAAC Completion Package for ITAAC 2.2.03.08c.i.01 (Reference 5) and is available for NRC review.
IT AAC Completion Statement Based on the above information, SNC hereby notifies the NRC that ITAAC 2.2.03.08c.i.01 was performed for VEGP Unit 4 and that the prescribed acceptance criteria were met.
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-PXS-ITPP-506, Rev. 1.1, "PXS CMT Mapping and Line Resistance Test"
- 2. SV4-PXS-ITR-800177 Rev. 0, IT AAC Technical Report, "Unit 4 Recorded Results of PXS Core Makeup Tank Injection Line Flow Resistance: ITAAC 2.2.03.08c.i.01"
- 3. SV4-PXS-T2R-005 Rev. 0, "Vogtle Unit 4 4-PXS-ITPP-506 Section 4.2 and 4.4 CMT Injection Line Flow Resistance Test Engineering Report"
- 4. SV4-PXS-T2C-005 Rev. 0, "Vogtle Unit 4 4-PXS-ITPP-506 Section 4.2 and 4.4 Core Makeup Tank to DVI Nozzle Flow Resistance Test Calculation"
- 5. ITAAC 2.2.03.08c.i.01-U4-CP-Rev0 Completion Package
- 6. NEI 08-01, "Industry Guideline for the ITAAC Closure Process Under 10 CFR Part 52"