ML23187A561
| ML23187A561 | |
| Person / Time | |
|---|---|
| Issue date: | 07/10/2023 |
| From: | Dinesh Taneja NRC/NRR/DEX/ELTB |
| To: | |
| References | |
| Download: ML23187A561 (13) | |
Text
Panel: Advanced Reactor I&C Licensing Licensing Review Framework for Risk-Informed, Performance-Based I&C Systems Dinesh Taneja, PE (Sr. Electronics Engineer) and Ian Jung (Sr. Reliability and Risk Analyst)
United States Nuclear Regulatory Commission
Agenda
- Licensing Modernization Project (LMP) and Regulatory Guide (RG) 1.233
- TI-RIPB (Technology-Inclusive, Risk-Informed, Performance Based) licensing framework
- Design Review Guide (DRG) for instrumentation and control (I&C)
- Focus on safety-significant SSCs
- Use of reliability / capability targets established by the LMP methodology
- Developed for non-light-water reactors (non-LWRs), but can be used for all reactor designs 2
LMP Methodology Approach
- Foundations laid in MHTGR, PBMR, and NGNP projects and incorporates NRC and ACRS reviews on key topics
- Technology-inclusive risk metrics
- Use of frequency-consequence targets
- Functional containment concept
- Treatment of multi-module plants
- Reliability targets in lieu of single failure criterion
- Technology-inclusive approach to defense-in-depth
- Incorporates developments in risk-informed, performance-based decision-making for wide spectrum of non-LWR designs 3
LMP is Risk-Informed and Performance-Based
- Risk-informed
- Incorporating key inputs from a probabilistic risk assessment (PRA)
- Incorporating deterministic principles such as evaluation of defense-in-depth adequacy
- Performance-based
- Use of a Frequency Consequence (F-C) Target and Cumulative Risk Targets to evaluate the risk significance of licensing basis events (LBEs) and structures, systems, and components (SSCs)
- Selection of performance targets for the reliability and capability of SSCs in the prevention and mitigation of LBEs
- Use of programs to monitor the performance of the plant and SSCs against the performance targets
- Use of an Integrated Decision-Making Process to implement RIPB decisions that impact the safety case and its objective evaluation 4
Licensing Modernization Project (LMP)
- Licensing Basis Events
- SSC Classification and Special Treatment
- Defense-in-Depth Adequacy 5
SSC Classifications 6
Derivation of Special Treatments
- SR SSCs
- Functional Design Criteria derived from required safety functions
- Lower-level design criteria derived from safety-related design criteria (SRDC)
- SR and NSRST SSCs
- SSC reliability and capability performance targets
- Focus on prevention and mitigation functions from LBEs
- Integrated decision-making process (IDP) to derive specific special treatments
- Reflects Commissions expectations for RIPB regulation (SRM-SECY 0144) 7
Evolution of I&C Review Guidance
- NUREG-0800, Standard Review Plan (SRP)
Chapter 7
- System-based approach for light-water reactor (LWR) licensing reviews
- Guidance not suitable for non-LWRs applications
- NuScale Design-Specific Review Standard (DSRS) Chapter 7
- Improved safety-focused licensing review approach
- Improved licensing reviews efficiency and ADAMS Accession No.
effectiveness ML21011A140
- DRG for I&C
- Leverages the DSRS concepts
- Leverages lessons learned from recent new reactor I&C licensing reviews 8
Goals of I&C DRG
- Modernizes the I&C safety review in support of advanced non-LWR licensing applications Safety-focused Risk-informed Performance-based Technology-Inclusive
- Supports the NRCs vision and strategy for advanced reactor safety reviews
- Incorporates principles from RG 1.233 9
10 11 Key messages
- I&C design is reviewed in a risk-Informed and performance-based manner under the LMP methodology for non-LWRs.
- The NRC staff uses DRG for I&C developed for non-LWRs using the LMP methodology.
- The NRC staffs review is safety-focused, commensurate with safety or risk significance of the I&C design, as part of a core team approach.
- The NRC staff encourages pre-application engagement.
12
Questions?
For Additional Information, contact:
Dinesh.Taneja@nrc.gov or Ian.Jung@nrc.gov 13