ML19095A667

NRR E-mail Capture - VC Summer SPRA Clarification Questions on Circuit Analysis and Relay Replacement

ML19095A667
Person / Time
Site:	Summer
Issue date:	01/30/2019
From:	Milton Valentin-Olmeda Division of Licensing Projects
To:	Kirkland W South Carolina Electric & Gas Co
References
Download: ML19095A667 (2)

Text

NRR-DMPSPEm Resource From: Valentin-Olmeda, Milton Sent: Wednesday, January 30, 2019 11:39 AM To: KIRKLAND, WILLIAM HANK Cc: STEWART, TRACEY (SCE&G - 8); Sebrosky, Joseph

Subject:

VC Summer SPRA Clarification Questions on Circuit Analysis and Relay Replacement

Hank, As part of the ongoing audit review of the VC Summer Seismic PRA submittal (ADAMS Accession No. ML18271A109), the NRC staff continues to work on a technical checklist similar to that in Enclosure 1 of our letter dated July 10, 2018 (ADAMS Accession No. ML18115A138). To proceed with our review, the following information is requested for clarification purposes:

• Circuit Analysis: While reviewing documents provided in response to Question 6 - Topic #11, the NRC staff could not determine if a circuit analysis was completed to support the relay-chatter evaluation. Please confirm if a circuit analysis was completed in accordance with SPID Section 6.4.2. If a circuit analysis was completed, please identify the guidance used.

• Relay Replacement: While reviewing documents provided in response to Question 6 - Topic #11, the NRC staff noticed that three voltage sensing relays (59DG A, B, C) in the Diesel Generator Control Cubical were a concern and were recommended in Document No. 13C4188-MEM-0018 Rev. 0, VC Summer SPRA, Seismic Simulation Testing Electrical Relay Chatter Review, to be replaced with solid-state relays. However, it is not clear if the replacement took place or not. Please confirm if the relays were replaced or provide a basis for not pursuing the replacement.

Your prompt response will be greatly appreciated.

Please contact me if there are any questions related to this email.

Respectfully, Milton Valentín, PM US NRC Division of Licensing Projects Beyond Design Basis Management (Fukushima)

Office of Nuclear Reactor Regulation Milton.Valentin@nrc.gov 301-415-2864 1

Hearing Identifier: NRR_DMPS Email Number: 912 Mail Envelope Properties (Milton.Valentin-Olmeda@nrc.gov20190130113800)

Subject:

VC Summer SPRA Clarification Questions on Circuit Analysis and Relay Replacement Sent Date: 1/30/2019 11:38:40 AM Received Date: 1/30/2019 11:38:00 AM From: Valentin-Olmeda, Milton Created By: Milton.Valentin-Olmeda@nrc.gov Recipients:

"STEWART, TRACEY (SCE&G - 8)" <TRACEY.STEWART@scana.com>

Tracking Status: None "Sebrosky, Joseph" <Joseph.Sebrosky@nrc.gov>

Tracking Status: None "KIRKLAND, WILLIAM HANK " <WILLIAM.KIRKLAND@scana.com>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 1731 1/30/2019 11:38:00 AM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: