ML20273A236
| ML20273A236 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 09/29/2020 |
| From: | NRC |
| To: | NRC/NRR/DNRL |
| References | |
| Download: ML20273A236 (14) | |
Text
From:
Schiller, Alina Sent:
Tuesday, September 29, 2020 10:17 AM To:
Vogtle PEmails Cc:
Gaslevic, James
Subject:
ITAAC 375 presentation material for 10-1-20 Vogtle Units 3 and 4 public meeting Attachments:
ITAAC 375 public call October 1.pptx From: Petrak, Tom G. <TGPETRAK@southernco.com>
Sent: Tuesday, September 29, 2020 10:01 AM To: Schiller, Alina <Alina.Schiller@nrc.gov>
Cc: Arafeh, Yasmeen N. <YNARAFEH@southernco.com>; Gaslevic, James <James.Gaslevic@nrc.gov>;
Welch, Christopher <Christopher.Welch@nrc.gov>; Hall, Victor <Victor.Hall@nrc.gov>; Lopez-Santiago, Omar <Omar.Lopez-Santiago@nrc.gov>
Subject:
[External_Sender] ITAAC 375 presentation material for 10-1 public call.
- Alina, Attached is the presentation material for the ITAAC 375 discussion for this Thursdays public call.
I will be sending a separate email with the MOV Loss of Motive Force presentation for this Thursdays public call later this morning.
Thomas G. Petrak Vogtle 3&4 ITAAC Manager Southern Nuclear Operating Company 7835 River Road, Bldg. 302 - Waynesboro, GA 30830 (706) 848-1575(o)
(706) 833-7581 (c)
Hearing Identifier:
Vogtle_COL_Docs_Public Email Number:
591 Mail Envelope Properties (BLAPR09MB6594DA7656E04825265E3EA196320)
Subject:
ITAAC 375 presentation material for 10-1-20 Vogtle Units 3 and 4 public meeting Sent Date:
9/29/2020 10:17:00 AM Received Date:
9/29/2020 10:17:05 AM From:
Schiller, Alina Created By:
Alina.Schiller@nrc.gov Recipients:
"Gaslevic, James" <James.Gaslevic@nrc.gov>
Tracking Status: None "Vogtle PEmails" <Vogtle.PEmails@nrc.gov>
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BLAPR09MB6594.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 916 9/29/2020 10:17:05 AM image001.png 3937 ITAAC 375 public call October 1.pptx 2010869 Options Priority:
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VEGP 3&4 ITAAC 375 October 1, 2020
Simplified RNS P&ID Normal Alignment
RNS Isolation Manual RNS containment actuation signal causes the following:
- RNS pumps to trip
- RNS system suction and discharge containment isolation MOVs (V022 and V011) to close
- RNS suction MOVs from the RCS to close. V001B and V002A close immediately and V002B and V001A close after a 60 second time delay.
Current Test Procedure
- RCS temperature > 275F
- RCS Pressure between 370 psig and 400 psig
- One RNS pump inservice taking suction from the RCS HL and discharging to DIV nozzles.
- One parallel suction line isolated
- One valve in the open parallel suction line is de-energized in the open position.
Current Test Alignment 1 of 4
Current Test Procedure 1.
Manual actuation of RNS isolation 2.
Verification that valves V022, V011 and the open energized suction isolation close and that the running RNS pump trips.
3.
Realign parallel suction lines as needed to test one of the other parallel suction valves 4.
Restart RNS system
- Repeat steps 1-4 until all four parallel suction valves have been tested
Proposed Test Procedure Prerequisites/Lineup
- RCS temperature > 275F
- RCS Pressure between 370 psig and 400 psig
- One RNS pump inservice taking suction from the RCS HL and discharging to DIV nozzles.
- Both parallel suction lines inservice
Proposed Test Alignment
Proposed Test Procedure 1.
Manual actuation of RNS isolation 2.
Verification that valves V022, V011 and all 4 suction isolation valves close and that the running RNS pump trips.
Reason for Change
- Proposed test meets the requirements of the ITAAC
- Projected to reduce HFT by 1 day
- Reduce duty cycles of the suction and discharge MOVs and the RNS pumps