ML16125A239

NRR E-mail Capture - South Texas Project Units 1 & 2, Draft Request for Additional Information for Risk Review for GSI-191

ML16125A239
Person / Time
Site:	South Texas
Issue date:	05/04/2016
From:	Lisa Regner Plant Licensing Branch IV
To:	Harrison W South Texas
References
MF2400, MF2401, MF2402, MF2403, MF2404, MF2405, MF2406, MF2407, MF2408, MF2409
Download: ML16125A239 (2)

Text

NRR-PMDAPEm Resource From: Regner, Lisa Sent: Wednesday, May 04, 2016 11:05 AM To: Wayne Harrison Cc: Michael Murray

Subject:

Draft Risk RAI: Question 6

Wayne, One additional question resulted from the April risk audit in Austin, TX. Please see below and let me know if you have any questions. The previous draft questions 1-5 were sent to you by email on March 22, 2016 (ML16082A484).

I am currently processing the formal RAI for the Risk questions and expect to issue those next week. Based on our telephone discussion, I understand you plan to respond to the risk questions with the 90-day response from the Round 3 RAI (ML16082A507). Since Round 3 was issued on April 11, 2016, I understand the risk RAI response will be submitted on or before July 11, 2016.

I will continue using the new numbering from the round 3 RAI. For clarity, the Risk RAI will be designated as Round 4 even though it is an extension of Round 3. The questions will be designated APLA-4-1 through APLA-4-6.

Confirm the accuracy of the computation of the CDF for the double-ended guillotine break (DEGB)-only model that was provided (STPNOC, 2015a and 2015b). It appears that the current approach assumes, for example, that a 12.8-in DEGB could occur in larger diameter pipes (e.g., 27.5-in, 29-in, and 31-in diameter pipes). Include arithmetic and geometric mean approaches.

Thanks, Lisa Lisa M. Regner Senior Project Manager Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Lisa.Regner@NRC.gov 301-415-1906 OWFN 8D08 1

Hearing Identifier: NRR_PMDA Email Number: 2819 Mail Envelope Properties (928899bbe2ac46f28b0caa256a1795cb)

Subject:

Draft Risk RAI: Question 6 Sent Date: 5/4/2016 11:05:13 AM Received Date: 5/4/2016 11:05:15 AM From: Regner, Lisa Created By: Lisa.Regner@nrc.gov Recipients:

"Michael Murray" <mpmurray@STpegs.com>

Tracking Status: None "Wayne Harrison" <awharrison@STPEGS.COM>

Tracking Status: None Post Office: HQPWMSMRS05.nrc.gov Files Size Date & Time MESSAGE 1450 5/4/2016 11:05:15 AM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received:

NRR-PMDAPEm Resource From: Regner, Lisa Sent: Wednesday, May 04, 2016 11:05 AM To: Wayne Harrison Cc: Michael Murray

Subject:

Draft Risk RAI: Question 6

Wayne, One additional question resulted from the April risk audit in Austin, TX. Please see below and let me know if you have any questions. The previous draft questions 1-5 were sent to you by email on March 22, 2016 (ML16082A484).

I am currently processing the formal RAI for the Risk questions and expect to issue those next week. Based on our telephone discussion, I understand you plan to respond to the risk questions with the 90-day response from the Round 3 RAI (ML16082A507). Since Round 3 was issued on April 11, 2016, I understand the risk RAI response will be submitted on or before July 11, 2016.

I will continue using the new numbering from the round 3 RAI. For clarity, the Risk RAI will be designated as Round 4 even though it is an extension of Round 3. The questions will be designated APLA-4-1 through APLA-4-6.

Confirm the accuracy of the computation of the CDF for the double-ended guillotine break (DEGB)-only model that was provided (STPNOC, 2015a and 2015b). It appears that the current approach assumes, for example, that a 12.8-in DEGB could occur in larger diameter pipes (e.g., 27.5-in, 29-in, and 31-in diameter pipes). Include arithmetic and geometric mean approaches.

Thanks, Lisa Lisa M. Regner Senior Project Manager Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Lisa.Regner@NRC.gov 301-415-1906 OWFN 8D08 1

Hearing Identifier: NRR_PMDA Email Number: 2819 Mail Envelope Properties (928899bbe2ac46f28b0caa256a1795cb)

Subject:

Draft Risk RAI: Question 6 Sent Date: 5/4/2016 11:05:13 AM Received Date: 5/4/2016 11:05:15 AM From: Regner, Lisa Created By: Lisa.Regner@nrc.gov Recipients:

"Michael Murray" <mpmurray@STpegs.com>

Tracking Status: None "Wayne Harrison" <awharrison@STPEGS.COM>

Tracking Status: None Post Office: HQPWMSMRS05.nrc.gov Files Size Date & Time MESSAGE 1450 5/4/2016 11:05:15 AM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: