ML18193B084

Summary of June 25, 2018 Public Meeting with NuScale on Chapter 7

ML18193B084
Person / Time
Site:	NuScale
Issue date:	07/18/2018
From:	Omid Tabatabai NRC/NRO/DLSE/LB1
To:	Samson Lee NRC/NRO/DLSE/LB1
Tabatabai O / 415-6616
References
Download: ML18193B084 (6)

Text

July 18, 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 JUNE 25, 2018, PUBLIC MEETING WITH NUSCALE POWER, LLC, TO DISCUSS THE U.S. NUCLEAR REGULATORY COMMISSION STAFF QUESTIONS RELATED TO NUSCALE DESIGN CERTIFICATION APPLICATION, TIER 2, CHAPTER 7, "INSTRUMENTATION AND CONTROLS" On June 25, 2018, representatives of the U.S. Nuclear Regulatory Commission (NRC) and NuScale Power, LLC (NuScale) held a public teleconference meeting to discuss the NRC staffs questions related to the NuScale Design Certification Application, Tier 2, Chapter 7, "Instrumentation and Controls."

captures the summary of the topics discussed during the teleconference. The agenda and list of meeting 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 No. ML18166A305.

Docket No.52-048

Enclosures:

1. Meeting Summary

2. Agenda

3. Attendees CONTACT: Omid Tabatabai, NRO/DLSE 301-415-6616

ML18193B084

• via email NRC-001 OFFICE NRO/DLSE/LB1:PM NRO/DLSE/LB1:LA* NRO/DEI/ICEB:BC*

NRO/DLSE/LB1:PM NAME OTabatabai MMoore LBetancourt OTabatabai DATE 7/12/2018 7/18/2018 7/12 /2018 7/18/2018

U.S. NUCLEAR REGULATORY COMMISSION

SUMMARY

OF THE JUNE 25, 2018, TELECONFERENCE WITH NUSCALE POWER, LLC TO DICUSS STAFFS QUESTIONS RELATED TO CHAPTER 7, INSTRUMENTATION AND CONTROLS During the public meeting the U.S. Nuclear Regulatory Commission (NRC) staff and NuScale Power, LLC (NuScale) representatives discussed the following topics:

Technical Specifications for Instrumentation Surveillances:

1. The NRC staff pointed out to NuScale that there was an inconsistency between the highly integrated protection system (HIPS) topical report, NuScale final safety analysis report (FSAR), and the Technical Specification (TS) bases documents regarding the use of terms self-check and self-test. The NRC staff requested NuScale to clarify which one of these terms they want to consistently use and whether or not they mean the same thing. NuScale stated that they use these terms interchangeably but would revise the design certifification application (DCA) to only use self-test.

2. The NRC staff noted that under the generic TS definition of ACTUATION LOGIC TEST (which appears to be based on the definition in the AP1000 STS, NUREG-2194), the first paragraph states, An ACTUATION LOGIC TEST shall be: a. The use of diagnostic programs, or application of simulated or actual input combinations...

The NRC staff requested NuScale to clarify what they mean by or.

The NRC staff clarified its concern that the or could be read two ways:

(1) Any segment of the circuit is able to be tested with a diagnostic program and with [manual] application of simulated [input] or actual input [signal]; the method used can vary from performance to performance.

(2) Each segment of the circuit can only be tested with a diagnostic program or with [manual] application of simulated [input] or actual input [signal]; the method used cannot vary from performance to performance.

The staff observed that the phrase diagnostic programs is ambiguous, and suggested it be replaced by an equivalent phrase, which is well defined in the HIPS topical report.

The applicant said it would modify the definition of ACTUATION LOGIC TEST to clarify the meaning of diagnostic programs.

3. The NRC staff noted that under the generic TS definition of ACTUATION LOGIC TEST, in the second paragraph, the third sentence (which is included in the AP1000 STS definition) states, The ACTUATION LOGIC TEST shall be conducted such that it provides component overlap with the actuated device. The NRC staff requested NuScale to explain why NuScale is providing component overlap.

4. In the second paragraph, the first part of the fourth sentence (which is not included in the AP1000 STS definition) states, The ACTUATION LOGIC TEST may be performed by means of any series of sequential, overlapping, or total steps; the second part of this sentence states,

, and each step must be performed within the Frequency in the Surveillance Frequency Control Program for the devices included in the step.

The NRC staff requested NuScale to explain why this sentence was added to the AP1000 definition of ACTUATION LOGIC TEST.

The issue of the intended meaning of the proposed first sentence of the definition of ACTUATION LOGIC TEST (which is based on the Westinghouse AP1000 STS definition), is related to allowing different Frequencies for different segments of an instrument loop. The proposed first sentence of the definition of ACTUATION LOGIC TEST states:

An ACTUATION LOGIC TEST shall be:

a. The use of diagnostic programs, or application of simulated or actual input combinations to test digital computer hardware; and

b. Verification of the required logic output.

Presumably, the test interval associated with using a diagnostic program will be different from a test interval based on application of simulated or actual input signal combinations. Therefore, clarification of the first sentence of the definition of ACTUATION LOGIC TEST, including clarification of diagnostic programs, as well as justification for including the third and fourth sentences, is being tracked as an open item under RAI 156-9031, Question 16-2, Sub-question c.

Module Protection System:

1.

Electrical Power Source for the 24-hour timers: NuScale stated that 24-hour timers are powered by the same source powering the Module Protection System (MPS). This is the highly reliable DC power (EDSS.) Section 7.0.4.1 discusses the timers being part of the MPS boundary. DC to DC power converters (which provide electrical isolation) monitors undervoltage conditions. If voltage degrades, MPS goes to a safe state and does its safety functions. There will be no indeterminate state. The NRC staff determined that no further action is needed.

2. Diagnostic programs: The NRC staff asked NuScale to clarify what was meant by diagnostic programs since the word program implies software. Additionally, the NRC staff pointed out to NuScale that the term diagnostic programs is not used in the FSAR Chapter 7 or in the HIPS Topical Report (TR). NuScale agreed to clarify what the term means in TS, and that it is consistent with the terms used in Chapter 7 and the HIPS TR.

U.S. NUCLEAR REGULATORY COMMISSION

SUMMARY

OF THE JUNE 25, 2018, TELECONFERENCE WITH NUSCALE POWER, LLC MEETING AGENDA Introduction 12:30 - 12:40 pm Staffs questions related to technical specifications 12:40 - 1:15 pm Staffs questions related to module protection system 1:15 - 1:35 pm Diagnostic Program 1:35 - 1:55 pm Public Comments 1:55 - 2:00 pm

U.S. NUCLEAR REGULATORY COMMISSION

SUMMARY

OF THE JUNE 25, 2018, TELECONFERENCE WITH NUSCALE POWER, LLC LIST OF ATTENDEES NuScale Power, LLC Joel Beres Paul Infanger Rob Meyer Jeff Ehlers Rufino Ayala Brian Arnholt Karl Gross U.S. Nuclear Regulatory Commission Staff Luis Betancourt Joe Ashcraft Dinesh Taneja Dawnmathews Kalathiveettil Victor Cusumano Sheila Ray Nadim Khan Bob Fitzpatrick Bob Tjader Craig Harbuck Omid Tabatabai