ML18177A087
| ML18177A087 | |
| Person / Time | |
|---|---|
| Site: | NuScale |
| Issue date: | 06/28/2018 |
| From: | Omid Tabatabai NRC/NRO/DNRL/LB1 |
| To: | Samson Lee NRC/NRO/DNRL/LB1 |
| Tabatabai O / 415-6616 | |
| References | |
| Download: ML18177A087 (6) | |
Text
June 28, 2018 MEMORANDUM TO:
Samuel 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
SUBJECT:
ADDENDA TO THE AUDIT PLAN FOR THE REGULATORY AUDIT OF NUSCALE POWER, LLC CONTAINMENT AND VENTILATION SYSTEMS NuScale Power, LLC (NuScale) submitted by letter dated December 31, 2016, to the U.S.
Nuclear Regulatory Commission (NRC), a Design Control Document for its Design Certification (DC) application of the NuScale design (Agencywide Documents Access and Management System Accession No. ML17013A229). In March 2017, the NRC staff began a regulatory audit of NuScales containment and ventilation systems to: (1) gain a better understanding of the NuScale design; (2) verify information; (3) identify information that will require docketing to support the basis of the licensing or regulatory decision; and (4) review related documentation and non-docketed information to evaluate conformance with regulatory guidance. The audit plan is available in ADAMS under Accession No. ML17087A077.
This addendum to the original audit plan is being issued to include the NRC staffs visit to NuScales test facility located at Oregon State University and to update the scope of the original audit plan.
Docket No.52-048
Enclosure:
- 1. Addenda to the Regulatory Audit of Containment and Ventilation Systems Audit Plan cc w/encl.: DC NuScale Power, LLC Listserv CONTACT:
Omid Tabatabai, NRO/DLSE 301-415-6616
- via email NRO-002 OFFICE NRO/DLSE/LB1: PM NRO/DLSE/LB1: LA NRO/DLSE/LB1 NAME OTabatabai MBrown OTabatabai (signed)
DATE 6/26/2018 6/27/2018 6/28/2018
U.S. NUCLEAR REGULATORY COMMISSION ADDENDA TO THE REGULATORY AUDIT OF CONTAINMENT AND VENTILATION SYSTEMS AS PART OF THE NUSCALE POWER, LLC DESIGN CONTROL DOCUMENT REVIEW NUSCALE DESIGN CERTIFICATION APPLICATION DOCKET NO.52-048 ADDENDUM 1 - Engagement and Closure Plan for SCVB DC Review Phase 2 Main Topic Sub-topic Specific Items (if any)
Target Completion Date Containment pressure analysis Observation of IRRVO test at NuScale Audit trip 6/25 - 28/2018 interim data /
documentation available from NuScale Review supporting reports / documents
- 7/2018 (2 weeks after test, per NuScale)
Final analysis and documentation available from NuScale (9/30)
Review supporting reports / documents
- 9/30/2018 (per NuScale) -
11/15/2018 IRRVO test audit summary call Exact date subject to mutual agreement and emergent meetings
(~45-day review) 11/16/2018 Interim audit summary regarding IRRVO testing Issue in accordance with OI IAW NRO OI Audit calls on SAR Section 6.2 and supporting documentation Exact date subject to mutual agreement and emergent meetings
(~45-day review) 10/11/2018, 11/16/2018 Containment integrated leakage rate testing RAI 9474 response expected August 17, 2018 (per NuScale)
Review supporting reports / documents *
(~45 day review) 8/17/2018 -
10/1/2018 Audit calls on SAR section and exemption request, and supporting documentation Exact date subject to mutual agreement and emergent meetings
(~45-day review) 8/30/18; 10/19/2018 Containment Isolation Exemption / RAI response expected 8/30/2018 (per NuScale)
Review supporting reports / documents
- 10/11/2018 SCVB Audit summary calls, as needed 7/10; 8/14; 9/11; 10/11 and 11/16 (final)
SCVB Audit summary input to DSLE 11/30/2018
- audit review conducted in eRR and/or other applicant-controlled space
2 ADDENDUM 2 - Engagement Plan for IRRVO testing audit The objective of this addendum to the NuScale Power, LLC (NuScale) Containment and Ventilation audit plan is to summarize a 3-stage audit activity focused on the Inadvertent RRV-opening (IRRVO) test that is planned to be conducted at the NIST-1 test facility during Summer 2018. The test will be conducted to demonstrate the NRELAP5 code capability to model the limiting containment peak pressure design basis event. The present addendum will be used to audit the relevant aspects for both the containment response analysis methodology (CRAM) technical report (TeR) referenced in Chapter 6, and the loss-of-coolant-accident (LOCA) methodology topical report (TR), in order to support both licensing actions. The three stages of the proposed audit activity pertain to: (1) observe testing at the NIST-1 facility, (2) an audit of the initial data within a few weeks after the IRRVO test, and (3) an audit of the test results and assessment reports for the IRRVO test, when available. Hereunder are the specifics for the three stages that are currently anticipated by the U.S. Nuclear Regulatory Commission (NRC) staff, but no limited to, though.
- 1. NIST-1 Audit Visit (June 26-27, 2018)
The IRRVO test is planned to be conducted on June 26, 2018. The following 3-member audit team plans to visit NIST-1 test facilities at Corvallis, OR, to conduct a two-day site audit on June 26 - 27, 2018.
Diane Jackson, Branch Chief, Containment and Ventilation Branch (SCVB)
Syed I. Haider, Reactor Systems Engineer (SCVB)
Carl Thurston, Reactor Systems Engineer (SRSB)
The NRC staff requests NuScale to facilitate a two-day site audit by arranging the following activities:
A discussion or briefing by NuScale staff of the test and facility to review test specifications, test procedures, pre-test predictions, and a discussion of key differences in test setup, instrumentation, and initial conditions as compared to Tests HP-06b and HP-38, A visit by the audit team to the control room to observe the pre-test procedures and the transient in progression up until a part of long-term cooling, and A tour by the audit team of the cooled-down test facility and brief review of test achievement in comparison to expectations (time permitting or discussion).
The NRC staff requests a room for staff discussion and as a base of operations.
The NRC staff requests the audit material identified in this plan, including copy of EC-T080-4872, EC-T080-5098, EC-T080-5993, and TSD-A010-57534.
3 Hereunder is a summary of the specific objectives and activities of the audit visit that the NRC staff seeks to achieve.
Inadvertent RRV-Opening (IRRVO) Test Setup Configuration & Scaling Discuss changes, if any, made to the NIST-1 facility since the test series were conducted that are reported in the LOCA topical report, e.g., HP-06b test. Also discuss the specific changes made to the test facility to prepare it for the IRRVO test.
Discuss any significant challenges in the test facility modification, tests, instrumentation, or modeling, and how they were addressed.
Discuss the orifice sizes and ECCS piping layouts of the NIST-1 pipes vis--vis the NPM RRV/RRV valve geometries that they are expected to simulate. The NRC staff seeks to understand that the orifice ID and the flow resistance of the RRV/RVV valves used at the NIST-1 facility for the IRRVO test properly scale to the maximum RRV/RVV orifice sizes specified for the NPM design submitted for approval. Availability of the related ECCS valve drawings and any pertinent documents is also sought for this part of the Stage 1 audit.
Discuss the flow discharge coefficients (Cd) and if they were recalibrated or recalculated for the modified RRV and RVV orifices for the IRRVO test. The NRC staff would like to review the calculation reports showing the old and new calibrations or calculations of the Cds at the audit.
Understand how many RVV openings are simulated as a part of the ECCS activation in the IRRVO test.
Understand changes, if any made to the CVCS lines for the IRRVO test.
Discuss the decay heat curve used for the IRRVO test.
Understand whether the IRRVO test is designed to be long enough for long term cooling.
The NRC staff requests to audit the NRELAP5 pre-test predictions for the IRRVO test, and any related reports, during the audit visit.
Initial/Boundary Conditions Discuss and gain an understanding of the ECCS and CNV pre-heating (steambathing) according to the pre-heating RAI (9380) response criteria.
Gain understanding of the CNV pre-pressurization for the IRRVO test (as was done in HP-06b).
Discuss and audit the scaling of the heat transfer plate thermal conductivity with that of the NPM containment wall, and review effects of the CNV shell and discuss its modeling in NRELAP5.
4 Instrumentation and Measurements The NRC staff is interested in gaining a better understanding of the acceptance criteria used to ensure that the instrumentation (TCs and DPs) employed in the test are properly calibrated and are ready to be used in the test.
The NRC staff needs to gain an understanding of the flow rate and temperature measurements for the RRV and RVV flows.
The NRC staff would like to discuss and gain understanding if there were any flow reversals observed in the core flow and RRV flow?
- 2. An Audit of the Initial Data (~July 2018)
NuScale expects that the initial test data and pre-test NRELAP5 simulations will be available for audit within a couple weeks after the test. Several SCVB and SRSB staff members and contractors, with responsibilities for the review areas related to the test, will be involved in this audit activity. The required information regarding the individual NRC staff members will be provided to NuScale in advance, as needed.
- 3. An Audit of the Test Results and Assessment Reports (~September 2018)
NuScale expects to make the test results and assessment reports available for audit within a couple months after the test. Several SCVB and SRSB staff members and contractors, with responsibilities for the review areas the test supports, will be involved in this audit activity. The required information regarding the individual NRC staff members will be provided to NuScale in advance, as needed.
The NRC staff plans to issue a partial or interim audit report on the testing and assessment activities for the IRRVO test performed within the Offices expected completion time of the test results and assessment reports, if timely.