ML18318A102

Summary of the November 13, 2018, Public Meeting with NuScale Power, LLC to Discuss Nuscale'S Response to Staff'S Request for Additional Information No. 9534

ML18318A102
Person / Time
Site:	NuScale
Issue date:	11/19/2018
From:	Tabatabai-Yazdi O NRC/NRO/DLSE/LB1
To:	Samson Lee NRC/NRO/DLSE/LB1
Tabatabai-Yazdi O/NRO/6616
References
Download: ML18318A102 (5)

Text

November 19, 2018 MEMORANDUM TO: Samuel S. Lee, Chief Licensing Branch 1 Division of Licensing, Siting, and Environmental Analysis Office of New Reactors FROM: Omid Tabatabai, Senior Project Manager /RA/

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

SUMMARY

OF THE NOVEMBER 13, 2018, PUBLIC MEETING WITH NUSCALE POWER, LLC., TO DISCUSS NUSCALES RESPONSE TO THE U.S. NUCLEAR REGULATORY COMMISSION STAFFS REQUEST FOR ADDITIONAL INFORMATION NO. 9534 On November 13, 2018, representatives of the U.S. Nuclear Regulatory Commission (NRC) and NuScale Power, LLC., (NuScale) held a public meeting to discuss NuScales response to NRC staffs request for additional information (RAI) No. 9534. captures the summary of the topics discussed during the meeting. The Meeting Agenda and List of Attendees are included in Enclosures 2 and 3, respectively. The meeting notice for this meeting is available in the Agencywide Documents Access and Management System (ADAMS) under accession number ML18298A275.

Docket No.52-048

Enclosures:

As stated cc w/enclosures: DC NuScale Power, LLC ListServ CONTACT: Omid Tabatabai, NRO/DLSE 301-415-6616

ML18318A102 *via email NRC-001 OFFICE NRO/DLSE/LB1:PM NRO/DLSE/LB1:LA NRO/DLSE/RPAC:BC NRO/DLSE/LB1:PM NAME OTabatabai CSmith* MDudek* OTabatabai DATE 11/13/2018 11/14/2018 11/16/2018 11/19/2018 U.S. NUCLEAR REGULATORY COMMISSION

SUMMARY

OF THE NOVEMBER 13, 2018, PUBLIC MEETING WITH NUSCALE POWER, LLC., TO DISCUSS NUSCALES RESPONSE TO THE U.S. NUCLEAR REGULATORY COMMISSION STAFFS REQUEST FOR ADDITIONAL INFORMATION NO. 9534 On June 15, 2018, the U.S. Nuclear Regulatory Commission (NRC) staff issued a request for additional information (RAI) No. 9534 to NuScale Power, LLC., (NuScale) to obtain additional information regarding NuScale designs control room habitability and compliance with Title 10 of the Code of Federal Regulation (10 CFR) Part 50, Appendix A, "General Design Criteria for Nuclear Power Plants," Criterion 19, Control Room. The NRC staffs RAI is accessible in ADAMS under accession number ML18166A308. NuScale submitted its respose to RAI 9534 in August 2018, and supplemental responses, in October 2018. NuScales response and supplemental responses are available in ADAMS (ML18242A685, ML18275A426, and ML18275A426).

The staff reviewed the supplemental information describing the inputs and assumptions used in NuScales control room habitability sensitivity analyses and had a question about the assumption of five cfm outside air intake flow during the period when failure of the non-safety-related control room ventilation system (CRVS) supplemental filtration mode was modeled.

Specifically, the staff noted that NuScales design certification application (DCA), Tier 2, Section 6.4, Control Room Habitability, (Table 6.4-1) stated that the minimum air supply needed to maintain breathable air in the control room envelope with respect to CO2 was listed as 80 cfm.

The staff stated that the radiological dose sensitivity analyses should also model realistic assumptions with regard to breathable air, and it appears to the staff that an assumed air supply of 5 cfm for a period of 27 days would not be sufficient. Given an increase in the outside air intake flow rate over 5 cfm, the staffs independent analyses show that the estimated dose in the control room increases, approaching closer to the 5 rem total effective dose equivalent (TEDE) dose criterion. Therefore, the staff asked NuScale to either provide a justification for the assumption of 5 cfm used in the current sensitivity analyses, or revise the analyses to use a reasonable air intake flow rate assumption to maintain breathable air in the control room, with justification.

The staff also asked NuScale to consider providing a discussion in the DCA to describe the sensitivity analyses to support the defense-in-depth capability of the control room habitability design. The applicant took it as an action to consider the discussion in the meeting and inform the staff on its plan to address the staffs concern with the sensitivity analyses.

Enclosure 1

U.S. NUCLEAR REGULATORY COMMISSION

SUMMARY

OF THE NOVEMBER 13, 2018, PUBLIC MEETING WITH NUSCALE POWER, LLC., TO DISCUSS NUSCALES RESPONSE TO STAFFS REQUEST FOR ADDITIONAL INFORMATION NO. 9534 MEETING AGENDA Time Topic 1:00 p.m.- 1:10 p.m. Introduction 1:10 p.m.- 1:55 p.m. RAI 9534 Discussions 1:55 p.m.- 2:00 p.m. Public Comments 2:00 p.m. Adjourn Enclosure 2

U.S. NUCLEAR REGULATORY COMMISSION

SUMMARY

OF THE NOVEMBER 13, 2018, TELECONFERENCE WITH NUSCALE LIST OF ATTENDEES NRC Michelle Hart Omid Tabatabai Michael Dudek NuScale John Palsmeier Paul Guinn Mark Shaver Lee Dougherty Carrie Fosaaen Members of the Public Sarah Fields Enclosure 3