ML15223B153

2015/07/16 NRR E-mail Capture - NRC Question: SouthTexas- RPV Cl Relief

ML15223B153
Person / Time
Site:	South Texas
Issue date:	07/16/2015
From:	Regner L M Plant Licensing Branch IV
To:	Sterling L South Texas
References
TAC MF6174
Download: ML15223B153 (3)

Text

1NRR-PMDAPEm ResourceFrom:Regner, LisaSent:Thursday, July 16, 2015 10:47 AMTo:Sterling, Lance (lsterling@STPEGS.COM)Cc:Kistler, Marilyn; Watford, MargaretSubject:NRC question: SouthTexas- RPV CL ReliefAttachments:SouthTexas-1 RAI-2 ENG-3-17 MF6174 N-770-1 RPV CL.docxImportance:HighLance, Marilyn, The staff has one more question on the relief. I believe it's pretty straightforward, but let me know if you need a call. Maggie will set up a call if needed.

Thanks, Lisa Hearing Identifier: NRR_PMDA Email Number: 2284 Mail Envelope Properties (196bc05c02a4450383a7bf44e3783e26)

Subject:

NRC question: SouthTexas- RPV CL Relief Sent Date: 7/16/2015 10:47:29 AM Received Date: 7/16/2015 10:47:30 AM From: Regner, Lisa Created By: Lisa.Regner@nrc.gov Recipients: "Kistler, Marilyn" <mkkistler@STPEGS.COM>

Tracking Status: None "Watford, Margaret" <Margaret.Watford@nrc.gov> Tracking Status: None "Sterling, Lance (lsterling@STPEGS.COM)" <lsterling@STPEGS.COM> Tracking Status: None Post Office: HQPWMSMRS05.nrc.gov Files Size Date & Time MESSAGE 192 7/16/2015 10:47:30 AM SouthTexas-1 RAI-2 ENG-3-17 MF6174 N-770-1 RPV CL.docx 69957

Options Priority: High Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received:

REQUEST FOR ADDITIONAL INFORMATION RELIEF REQUEST RR-ENG-3-17REGARDING DEFERRAL OF INSERVICE INSPECTION OF REACTOR PRESSURE VESSEL COLD LEG NOZZLE DISSIMILAR METAL BUTT WELDS STP NUCLEAR OPERATING COMPANY SOUTH TEXAS PROJECT, UNIT 1 DOCKET NUMBER50-498

By letter dated April 24, 2015 (ADAMS Number ML15133A130), STP Nuclear Operating Company (the licensee) requested relief from requirements of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (B&PV Code) for the volumetric examination of the reactor pressure vessel (RPV) cold leg nozzle dissimilar metal (DM) butt welds at the South Texas Project (South Texas), Unit 1.

To complete its review, the NRC staff requests the following additional information. 1. In order for the NRC staff to perform a confirmatory flaw evaluation, provide the following information for the RPV cold leg DM welds under consideration.

a. Provide normal operating pressure that the South Texas, Unit 2, RPV cold leg DM welds are exposed to. The NRC staff notes that Table 3-2 in Attachment 1 of relief request RR-ENG-3-17 shows the RPVinlet nozzle piping loads. b. Do the maximum pipe break loads given in Table 3-2 include the pressure loads. If the provided maximum pipe break loads did not include pressure loads, then provide the pressure loads. c. Dothe safe shutdown earthquake (SSE) loads given in Table 3-2 include both the SSE inertia loads and the SSE seismicanchor movement (SAM) loads. If the provided SSE loads did not include SSE inertia loads and SSE SAM loads, then provide SSE inertia loads and SSE SAM loads.