ML20192A011
| ML20192A011 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 07/10/2020 |
| From: | NRC |
| To: | NRC/NRR/DNRL |
| References | |
| Download: ML20192A011 (4) | |
Text
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
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7/10/2020 6:27:03 AM From:
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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:
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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.
ReactorVessel CaskLoading
Pit
M
M RNSV055 RNSV056 RNSMP 01A RNSME 01A RNSV006A
M RNSV022
M RNSV002A
M RNSV001A FromRCSHotLeg CVSReturn FromIRWST RNSFT001A RNSV007A RNSV011 RNSV013 RNSV015A RNSV017A PXSR01A MV MV RNSMP 01B RNSME 01B RNSV006B RNSV007B MV PXSR01B RNSV015B RNSV017B FromCMTA FromCMTB Original
4.517" Replaced
4.45" Original
4.42" FlowpathfromCaskLoadingPitOnly FlowpathfromRCSHotLetOnly CommonFlowpath ITAAC375:RNSFlowpathfromCaskLoadPit(Item9c)andfromRCSHotLeg(Item9b)
RNSV008A RNSV008B RNSFT001B HotLegFlowrate Accept.Crit.1400gpm ARNSPump
InitialTest-2018gpm Retest-1988gpm BRNSPump InitialTest-1992gpm Retest-1992gpm CLPFlowrate Accept.Crit.1100gpm ARNSPump
2241gpm BRNSPump 2133gpm INFORMATION N
FOR OR ORR TION V011 011 RNS RNSV013 V013 RNS NSMP M
01BB RNS RN ME 01B 01B FO R
R ONLY ONL NLY NL From RCS RC