ML20097C229

Summary of the March 9, 2020, Category 1 Public Teleconference with NuScale Power, LLC to Discuss the Emergency Core Cooling System Boron Distribution

ML20097C229
Person / Time
Site:	NuScale
Issue date:	04/07/2020
From:	Vera Amadiz M NRC/NRR/DNRL/NRLB
To:	Michael Dudek NRC/NRR/DNRL/NRLB
Vera Amadiz M
References
Download: ML20097C229 (9)

Text

April 7, 2020 MEMORANDUM TO:

Michael I. Dudek, Chief New Reactor Licensing Branch Division of New and Renewed Licenses Office of Nuclear Reactor Regulation FROM:

Marieliz Johnson, Project Manager /RA/

New Reactor Licensing Branch Division of New and Renewed Licenses Office of Nuclear Reactor Regulation

SUMMARY

OF THE MARCH 9, 2020, CATEGORY 1 PUBLIC TELECONFERENCE WITH NUSCALE POWER, LLC TO DISCUSS THE EMERGENCY CORE COOLING SYSTEM BORON DISTRIBUTION OF THE DESIGN CERTIFICATION APPLICATION On March 9, 2020, representatives from the U.S. Nuclear Regulatory Commission (NRC) and NuScale Power, LLC (NuScale), held a Category 1 public teleconference to discuss NuScales Emergency Core Cooling System (ECCS) Boron Distribution of the Design Certification Application. Participants included personnel from the NRC, NuScale and a member of the public.

The public meeting notice can be found in the Agencywide Documents Access and Management Systems under Accession Number ML20063K550. This meeting notice was also posted on the NRC public website located at https://www.nrc.gov/reactors/new-reactors/design-cert/nuscale/documents.html.

The Meeting Agenda, List of Attendees and NuScales Presentation Slides can be found in Enclosures 1, 2 and 3, respectively.

During the teleconference, NuScale discussed its presentation (Enclosure 3). NuScale explained that the NuScale design can experience redistribution of boron under ECCS operation. To address this phenomenon, NuScale performed an evaluation, summarized in FSAR Section 15.0.6.1 and the response to RAI 8930 (ML19332A120), which the NRC staff reviewed and summarized in Section 15.0.6 of its Phase 4 Safety Evaluation Report, that demonstrated that boron would concentrate in the core, and that the diluted return flow from the ECCS would not cause a recriticality due to the boron redistribution.

CONTACT: Marieliz Johnson, NRR/DNRL 301-415-5861

NuScale discussed its recent discovery that, for certain conditions, the ECCS actuated later than expected for those scenarios, and is currently planning to lower the ECCS actuation setpoint on the containment high water level to ensure that the ECCS actuates sooner when the containment water level is lower. NuScale stated that this would preserve the RAI 8930 response basis and maintain the bounding analysis in FSAR Section 15.0.6, for a return-to-power from the end-of-cycle conditions. NuScale stated it is in the process of performing supporting analyses, and also described the potential need it is currently evaluating for an additional ECCS actuation on pressure difference between the reactor pressure vessel and containment.

NuScale will send the NRC a list of FSAR sections and technical and topical reports that will be affected because of the change. NuScale is in the process of determining a schedule for the submittal of the supplementary information.

Docket No.52-048

Enclosures:

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

ML20097C229

• via e-mail NRR-106 OFFICE NRR/DNRL/NRLB: PM NRR/DNRL/NRLB: LA NRR/DNRL/NRLB: PM NAME MJohnson CSmith*

MJohnson DATE 04/06/2020 04/06/2020 04/07/2020

U.S. NUCLEAR REGULATORY COMMISSION CATEGORY 1 PUBLIC TELECONFERENCE WITH NUSCALE POWER, LLC TO DISCUSS THE EMERGENCY CORE COOLING SYSTEM BORON DISTRIBUTION OF THE DESIGN CERTIFICATION APPLICATION March 9, 2020 1:30 p.m. - 3:00 p.m.

Meeting Agenda Time Subject 1:30 p.m. - 1:45 p.m.

Welcome and Introductions 1:45 p.m. - 2:40 p.m.

Technical Discussion 2:40 p.m. - 2:50 p.m.

Public - Questions and Comments 2:50 p.m. - 3:00 p.m.

Closed Portion 3:00 p.m.

Adjourn

U.S. NUCLEAR REGULATORY COMMISSION CATEGORY 1 PUBLIC TELECONFERENCE WITH NUSCALE POWER, LLC TO DISCUSS THE EMERGENCY CORE COOLING SYSTEM BORON DISTRIBUTION OF THE DESIGN CERTIFICATION APPLICATION March 9, 2020 List of Attendees NAME AFFILIATION Marieliz Johnson U.S. Nuclear regulatory Commission (NRC)

Rebecca Patton NRC Michael Dudek NRC Bruce Bavol NRC Anna Bradford NRC Robert Caldwell NRC Joseph Donoghue NRC Dinesh Taneja NRC Jeffrey Schmidt NRC Ryan Nolan NRC Thomas Scarbrough NRC Shanlai Lu NRC Omid Tabatabai-Yazdi NRC Syed Haider NRC Marie Pohida NRC Stacey Rosenberg NRC Gregory Cranston NRC Michael Snodderly NRC Joseph Ashcraft NRC Matthew Presson NuScale Power, LLC (NuScale)

Mike Melton NuScale Elisa Fairbanks NuScale Ben Bristol NuScale Meghan McCloskey NuScale Taylor Coddington NuScale Morris Byram NuScale Marty Bryan NuScale Andy Lingenfelter NuScale Paul Infanger NuScale Sarah Fields Public

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