ML19056A019

Summary of Category 1 Public Teleconference with Nuscale Power, LLC, to Discuss the Inadvertent Actuation Block Valve of the Design Certification Application

ML19056A019
Person / Time
Site:	NuScale
Issue date:	02/27/2019
From:	Amadiz Marieliz Vera NRC/NRO/DLSE/LB1
To:	Samson Lee NRC/NRO/DLSE/LB1
Vera A M/nro/5861
References
Download: ML19056A019 (6)

Text

February 27, 2019 MEMORANDUM TO: Samuel S. Lee, Chief Licensing Branch 1 Division of Licensing, Siting, and Environmental Analysis Office of New Reactors FROM: Marieliz Vera, Project Manager /RA/

Licensing Branch 1 Division of Licensing, Siting, and Environmental Analysis Office of New Reactors

SUMMARY

OF THE FEBRUARY 7, 2019, CATEGORY 1 PUBLIC TELECONFERENCE WITH NUSCALE POWER, LLC, TO DISCUSS THE INADVERTENT ACTUATION BLOCK VALVE OF THE DESIGN CERTIFICATION APPLICATION The U.S. Nuclear Regulatory Commission (NRC) held a Category 1 public teleconference on February 7, 2019, to discuss the Inadvertent Actuation Block (IAB) valve of the NuScale Power, LLC (NuScale) Design Certification Application. Participants included personnel from NuScale and members of the public.

The public meeting notice can be found in the Agencywide Documents Access and Management System under Accession No. ML19031A650. This meeting notice was also posted on the NRC public website.

The Meeting Agenda and List of Participants can be found in Enclosures 1 and 2, respectively.

Summary:

On February 7, 2019, the NRC staff held a public meeting with NuScale to continue discussions about NuScales letter dated December 14, 2018 (ML18351A146), titled NuScale Power, LLC Request for Commission Clarification on the Application of the Single Failure Criterion to Active-Passive Components, regarding the application of the single failure criterion (SFC) to the inadvertent actuation block (IAB) valve in the emergency core cooling system (ECCS) for the NuScale small modular reactor. The purpose of the meeting was to allow NuScale to present the options they are considering to help resolve the issues associated with the IAB valve and their implications. NuScale communicated that it will consider the various options CONTACT: Marieliz Vera, NRO/DLSE 301-415-5861

S. Lee based on further interactions with the NRC. During the meeting, NuScale discussed ten possible options, several of which assumed the application of the SFC to the IAB valve. The options discussed were:

Option 1: No Change - NRC Staff agrees with basis in December 14, 2018, letter for passive components.

Option 2: Limit policy interpretation to NuScale.

Option 3: Rely on planned IAB functional.

Option 4: Exemption to Title 10 of the Code of Federal Regulations Part 50, Appendix A SFC.

Option 5: Revise inadvertent opening of ECCS event sequence.

Option 6: Revise Chapter 15 events to accommodate active IAB.

Option 7: Generic new SFC policy.

Option 8: credit highly reliable DC power system.

Option 9: Remove IABs from design.

Option 10: Redo Safety Analysis with active IABs.

Both NuScale and the NRC staff agreed that some of the options might not resolve the issue completely and/or will impact the review schedule for the NuScale design certification application. The staff will take into consideration the information provided by NuScale going forward.

Docket No.52-048

Enclosures:

As stated cc w/encls.: DC NuScale Power, LLC Listserv

ML19056A019 *via email NRC-002 OFFICE NRO/DLSE/LB1: PM NRO/DLSE/LB1: LA NRO/DNRL/LB1: PM NAME MVera CSmith MVera DATE 02/14/2019 02/25/2019 02/27/2019 U.S. NUCLEAR REGULATORY COMMISSION CATEGORY 1 PUBLIC TELECONFERENCE WITH NUSCALE POWER, LLC, TO DISCUSS THE INADVERTENT ACTUATION BLOCK VALVE OF THE DESIGN CERTIFICATION APPLICATION February 7, 2019 1:00 p.m. - 3:00 p.m.

Meeting Agenda Time Topic 1:00 p.m. - 1:15 p.m. Welcome and Introductions 1:15 p.m. - 2:00 p.m. Technical discussion 2:00 p.m. - 2:15 p.m. Public - Questions and Comments 2:15 p.m. - 3:00 p.m. Closed portion 3:00 p.m. Adjourn Enclosure 1

U.S. NUCLEAR REGULATORY COMMISSION CATEGORY 1 PUBLIC TELECONFERENCE WITH NUSCALE POWER, LLC, TO DISCUSS THE INADVERTENT ACTUATION BLOCK VALVE OF THE DESIGN CERTIFICATION APPLICATION February 7, 2019 List of Attendees NAME AFFILIATION Marieliz Vera U.S. Nuclear Regulatory Commission (NRC)

Timothy Drzewiecki NRC Thomas Scarbrough NRC Ryan Nolan NRC Sam Lee NRC Thomas Steinfeldt NRC Rebecca Karas NRC Kevin Coyne NRC Ashley Clint NRC Shanlai Lu NRC Gregory Cranston NRC Tim McGinty NRC Benjamin Parks NRC John Monninger NRC Jeffrey Schmidt NRC Jody Martin NRC Tania Martinez Navedo NRC Vonna Ordaz NRC Josh Whitman NRC Robert Lukes NRC Kent Wood NRC Phillip Sahd NRC Tom Bergman NuScale Power, LLC (NuScale)

Gary Becker NuScale Zack Rad NuScale Robert Gamble NuScale John Fields NuScale Andy Lingenfelter NuScale Greg Myers NuScale Colin Sexton NuScale Enclosure 2

NAME AFFILIATION Matt Presson NuScale Marty Bryan NuScale Paul Infanger NuScale Dan Lassiter NuScale Enclosure 2