ML18296A345

October 10, 2018, Summary of Public Meeting with Nuscale Power, LLC, to Discuss the ECCS Performance Requirements

ML18296A345
Person / Time
Site:	NuScale
Issue date:	11/01/2018
From:	Tabatabai-Yazdi O NRC/NRO/DLSE/LB1
To:	Samson Lee NRC/NRO/DLSE/LB1
Tabatabai-Yazdi O/NRO415-6616
References
Download: ML18296A345 (5)

Text

November 1, 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 OCTOBER 10, 2018, PUBLIC MEETING WITH NUSCALE POWER, LLC., TO DISCUSS THE EMERGENCY CORE COOLING SYSTEM PERFORMANCE REQUIREMENTS On October 10, 2018, representatives of the U.S. Nuclear Regulatory Commission (NRC) and NuScale Power, LLC (NuScale) held a public teleconference meeting to discuss staffs questions related to Nucales emergency core cooling system (ECCS) performance requirements. captures the summary of the topics discussed during the teleconference. 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 ML18277A141.

Docket No.52-048

Enclosures:

As stated CONTACT: Omid Tabatabai, NRO/DLSE 301-415-6616

ML18296A345 *via email NRC-001 OFFICE NRO/DLSE/LB1:PM NRO/DLSE/LB1:LA* NRO/DLSE/LB1:PM NAME OTabatabai CSmith* OTabatabai DATE 11/01/2018 10/30/2018 11/01/2018 U.S. NUCLEAR REGULATORY COMMISSION

SUMMARY

OF THE OCTOBER 10, 2018, PUBLIC MEETING WITH NUSCALE POWER, LLC, TO DISCUSS THE EMERGENCY CORE COOLING SYSTEM (ECCS)

PERFORMANCE REQUIREMENTS The U.S. Nuclear Regulatory Commission (NRC) staff issued Request for Additional Information (RAI) 9469, Question 6.03-7 requesting that NuScale update the Tier 1 information to include top-level performance requirements for the emergency core cooling system (ECCS) valves.

Currently, the Tier 1 information on the ECCS valves states that: (1) The ECCS valves change position under design differential pressure, (2) The ECCS safety-related RRVs and RVVs fail to their safety-related position ., and (3) The safety-related valves are functionally designed and qualified to perform their safety-related function .

The NRC staff requested this meeting with NuScale to discuss the following questions:

1. Due to the safety significance of the ECCS valves in the NuScale design, the NRC staff wants to discuss the inclusion of functional and top-level performance requirements for the ECCS valves in Tier 1.

2. In RAI 9469, Question 6, NuScales response only identified a generic water hammer analysis approach documented in Section 3.12.3.4. However, there is no specific analysis provided regarding ECCS actuator line and trip reset valves water hammer effects evaluation, which is what the staff needs. What is the status and the path forward?

3. In RAI 9469 Question 2, NuScales response is related to the RAI 9536 resolution and the inadvertent actuation block (IAB) valve single failure determination. After these two issues are resolved, RAI 9469 will need to be updated to support the conclusion that ECCS design can provide needed cooling during Non-loss-of-coolant accident events.

NuScale agreed to inform the staff via an email if it can supplement its response to RAI 9469, Question 7 with respect to the staffs Question 1 above. Also, NuScale agreed to supplement its response to RAI 9469, Question 2, however, NuScale stated that it would supplement its response after RAI 9536 and the IAB single failure issues have been resolved.

Enclosure 1

U.S. NUCLEAR REGULATORY COMMISSION

SUMMARY

OF THE OCTOBER 10, 2018, PUBLIC MEETING WITH NUSCALE TO DISCUSS ECCS PERFORMANCE REQUIREMENTS MEETING AGENDA Introduction 1:00 p.m.- 1:05 p.m.

Staff Questions on ECCS Performance Requirements 1:05 p.m.- 1:55 p.m.

Public Comments 1:55 p.m.- 2:00 p.m.

Adjourn 2:00 p.m.

Enclosure 2

U.S. NUCLEAR REGULATORY COMMISSION

SUMMARY

OF THE OCTOBER 10, 2018, TELECONFERENCE WITH NUSCALE LIST OF ATTENDEES NuScale Power, LLC Grey Myers Paul Infanger Marty Bryan Carl Dumsday Zack Houghton Dan Lasiter Chris Maxwell Scott Harris John Fields Ben Bristol Dan Diefendorf JJ Arthur U.S. Nuclear Regulatory Commission Staff Marieliz Vera Tim Drzewiecki Tim Lupold Shanlai Lu Nick Hansing Enclosure 3