ML20192A011

COL Docs - FW: ITAAC Discussion Items

ML20192A011
Person / Time
Site:	Vogtle
Issue date:	07/10/2020
From:	NRC
To:	NRC/NRR/DNRL
References
Download: ML20192A011 (4)

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From: Rankin, Jennivine Sent: Friday, July 10, 2020 6:27 AM To: Vogtle PEmails

Subject:

FW: ITAAC Discussion Items Attachments: ITAAC Discussion Items.docx; Sketch of RNS from CLP to DVI.pdf Presentation material for public meeting with SNC on July 16, 2020.

From: Petrak, Tom G. <TGPETRAK@southernco.com>

Sent: Thursday, July 9, 2020 4:09 PM To: Hall, Victor <Victor.Hall@nrc.gov>

Cc: Beilke, Robert Leo <X2RLBEIL@southernco.com>

Subject:

[External_Sender] ITAAC Discussion Items

Victor, Here are the ITAAC discussion items we discussed along with a information only flow diagram that helps to describe the various flowpaths.

Tom Petrak

Hearing Identifier: Vogtle_COL_Docs_Public Email Number: 575 Mail Envelope Properties (SA9PR09MB5999CF04853F01F2496AF35E98650)

Subject:

FW: ITAAC Discussion Items Sent Date: 7/10/2020 6:27:00 AM Received Date: 7/10/2020 6:27:03 AM From: Rankin, Jennivine Created By: Jennivine.Rankin@nrc.gov Recipients:

"Vogtle PEmails" <Vogtle.PEmails@nrc.gov>

Tracking Status: None Post Office: SA9PR09MB5999.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 583 7/10/2020 6:27:03 AM ITAAC Discussion Items.docx 16988 Sketch of RNS from CLP to DVI.pdf 704799 Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

ITAAC 375 - RNS Pump Flow to RCS - Not Targeted See attached simplified flow diagram

1. RNS mid-loop flow test (Hot leg - RNS Pump - RCS) o Test initially performed SAT in December of 2019 with temporary orifices believed to be smallest expected diameter.

o During CMT testing, A train orifice diameter was reduced from 4.517 to 4.45. B train orifice diameter did not change.

o Test reperformed on July 3rd with SAT test results. As expected, A train flow reduced slightly and B train flow remained the same.

2. RNS cask loading pit flow test (Cask loading pit - RNS Pump - RCS) o Test initially performed SAT in December of 2019 with temporary orifices believed to be smallest expected diameter.

o During CMT testing, A train orifice diameter was reduced from 4.517 to 4.45. B train orifice diameter did not change.

o Plan is to credit the July 3rd RNS mid-loop flow test for the discharge side of the RNS pumps and the December 2019 cask loading pit test for the suction side.

3. Check valve RNS-V013 o Transfer open test completed SAT. Test was performed under dual pump operation.

o The check valve had to be disassembled and the seat lapped due to excess seat leakage.

o Post maintenance test performed (dual pump operation) during the ADS Stages 1-3 flow resistance testing. (IRWST - RNS Pumps - ADS Stages 1 IRWST).

4. Check Valve RNS - V017B o Transfer open test completed SAT. Test was performed under dual pump operation. (Hot leg - RNS Pumps - RCS) o Valve had to be disassembled to perform a weld inspection.

o Post maintenance test performed during CMT holdup test. (IRWST - RNS Pumps - RCS)

ITAAC 216 - PXS Check Valves Position - Targeted

1. Check Valve PXS -V122B o Tested open during IRWST injection flow resistance test. Valve opened but position indication failed to show open.

o Initial test plan required a change in position indication to show valve closed.

o Maintenance of the position indicator failed to show valve open during re-test o Plan to use leak test of the check to show valve closure.

2. Check Valves PXS - V016A&B, V017A&B o Use a demin water source to test check valves.

o To date the demin water sources used have had insufficient volume and/or flow capacity to test the valves o A new plan using China OE is being developed.

ITAAC375:RNSFlowpathfromCaskLoadPit(Item9c)andfromRCSHotLeg(Item9b)

HotLegFlowrate Accept.Crit.1400gpm ARNSPump

InitialTest-2018gpm CVSReturn Retest-1988gpm BRNSPump InitialTest-1992gpm M

Retest-1992gpm M M

FromRCSHotLeg From RC RCS RNSV022 RNSV002A RNSV001A Y

FromIRWST CaskLoading

L Pit RNSFT001A N PXSR01A M

M

MV RNSV055 RNSV056 MV RNSME 01A RNSV006A RNSV007A V011 011 RNSV011 RNS RNS V013 RNSV013 O RNSV015A RNSV017A Original

4.517" Replaced

RNSMP 4.45" CLPFlowrate 01A N Accept.Crit.1100gpm ARNSPump

FromCMTA 2241gpm RNSV008A BRNSPump 2133gpm I O ReactorVessel FlowpathfromCaskLoadingPitOnly FlowpathfromRCSHotLetOnly CommonFlowpath A T RNSFT001B R

M FromCMTB RNSV006B RNSV007B MV RNS NSMP M

RNSMP RN ME RNS RNSME 01B R PXSR01B 01BB F O RNSV015B RNSV017B Original

4.42" RNSV008B IN