ML20031C830

NRR E-mail Capture - Summary of Clarifying Call - January 30, 2020 - Hatch NFPA 805 LAR

ML20031C830
Person / Time
Site:	Hatch
Issue date:	01/30/2020
From:	John Lamb NRC/NRR/DORL/LPL2-1
To:	Enfinger T Southern Nuclear Operating Co
References
Download: ML20031C830 (2)

Text

From: Lamb, John Sent: Thursday, January 30, 2020 11:21 AM To: Enfinger, Timothy Lee; Joyce, Ryan M.

Cc: Robinson, Jay; Hyslop, JS; Whitman, Jennifer

Subject:

Summary of Clarifying Call - January 30, 2020 - Hatch NFPA 805 LAR Importance: High Tim and Ryan, Today, a clarification call was held between Southern Nuclear Operating Company (SNC, the licensee) and the U.S. Nuclear Regulatory Commission (NRC) regarding the Hatch NFPA 805 License Amendment Request (LAR), dated April 4, 2018 (Agencywide Documents and Access Management System (ADAMS) Accession No. ML18096A936).

The following two items were not included in the licensees response to Probabilistic Risk Assessment (PRA) Request for Additional Information (RAI) 03, dated December 13, 2019 (ADAMS Accession No. ML19351D130):

In its response to NFPA 805 PRA RAI 07.01(a), dated October 7, 2019 (ADAMS Accession No. ML19280C812), SNC stated that the Fire PRA (FPRA) methodology for treatment of enclosed sensitive electronics will be updated, so that electrical cabinets that contain sensitive electronics will not be screened, based on the function of the electrical cabinet. Electrical cabinets that contain enclosed sensitive electronics will be treated as such in the FPRA. The results will be included in the aggregate analysis in response to PRA RAI 03.

In its response to NFPA 805 PRA RAI 15.b.01.b.ii, dated October 7, 2019 (ADAMS Accession No. ML19280C812), SNC stated that a surrogate Main Control Room (MCR) abandonment Conditional Core Damage Probability (CCDP) limit will no longer be used in the compliant model. The change in risk will be based on the calculated risk of the compliant and post transition plant models. This is consistent with the other fire area risk evaluations. These results will be included with the response to RAI 03.

The SNC staff stated that SNC would provide a supplement to the NFPA 805 LAR to clarify the two above PRA RAI responses by next week (no later than February 7, 2020).

The NRC staff did not make any regulatory decisions during the conference call.

Thanks.

John

Hearing Identifier: NRR_DRMA Email Number: 423 Mail Envelope Properties (MN2PR09MB54515FD5227325B5B53A70A0FA040)

Subject:

Summary of Clarifying Call - January 30, 2020 - Hatch NFPA 805 LAR Sent Date: 1/30/2020 11:21:18 AM Received Date: 1/30/2020 11:21:00 AM From: Lamb, John Created By: John.Lamb@nrc.gov Recipients:

"Robinson, Jay" <Jay.Robinson@nrc.gov>

Tracking Status: None "Hyslop, JS" <JS.Hyslop@nrc.gov>

Tracking Status: None "Whitman, Jennifer" <Jennifer.Whitman@nrc.gov>

Tracking Status: None "Enfinger, Timothy Lee" <TLENFING@SOUTHERNCO.COM>

Tracking Status: None "Joyce, Ryan M." <RMJOYCE@southernco.com>

Tracking Status: None Post Office: MN2PR09MB5451.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 1861 1/30/2020 11:21:00 AM Options Priority: High Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: