ML18109A540
| ML18109A540 | |
| Person / Time | |
|---|---|
| Issue date: | 04/05/2018 |
| From: | William Reckley NRC/NRO/DSRA/ARPB |
| To: | |
| Reckley W | |
| Shared Package | |
| ML18109A084 | List: |
| References | |
| Download: ML18109A540 (12) | |
Text
Advanced Reactor Guidance Documents April 5 & 6, 2018 1
Bridge Number Pass Code (888) 793-9929 87972
Discussion Topics 2
- Any limitations on scope in terms on non-LWR designs, technologies, or sizes (micro through large) ?
- NRC to provide feedback following meeting to support next revision / meeting
Guidance Scope / Context (content & level of detail) 3 General Description of the Plant Site Characteristics Design of SSCs and Equipment Reactor Reactor Coolant and Connecting Systems Engineered Safety Features Instrumentation and Controls Electric Power Auxiliary Systems Steam and Power Conversion System Radioactive Waste Management Radiation Protection Conduct of Operations Verification Programs Transient and Accident Analyses Technical Specifications Quality Assurance and Reliability Assurance Human Factors Engineering Probabilistic Risk Assessment/Severe Accident Evaluation Defense in Depth Emergency Planning Security Staffing Fire Protection Mitigating Strategies Aircraft Impact Assessment Environmental Report Financial Inspections, Tests, Analyses, and Acceptance Criteria Insurance Other (design or technology specific)
LMP Primary Systems Support &
Secondary Systems Analyses (LMP)
Advanced Reactor Program 4
Feb/March 2017 stakeholder meetings Support: 7, 8, 9 Key: 4, 5, 6 Deterministic: 15 PRA: 19 Programs:
12, 13, 14, 16, 17, 18 Site / Design: 2, 3 Other: 11 Assessment:
15, 19, 21 DID: 20 Misc 10 LMP focus
5 Integrating Activities Nov/Dec 2017 stakeholder meetings
Discussion Topics 6
- Regulatory foundations/precedents (p7)
- Event category frequency and dose ranges (p8 - 11)
- Staff needs to accept or propose revisions
- Plant, multi-module, fleet (p9)
- External events (p14) - needs additional discussion, clarity related to establishing design basis external hazards, deterministic and PRA treatments Note - blue text indicates LMP discussion topic within Draft H of guidance document (ML18094B085).
Discussion Topics 7
LBE against F-C target (p 13-14) - barrier integrity approach as possible means to meeting F-C target and then throughout in terms of performance metric. Possible for some designs to adopt maximum hypothetical accident approach similar to analyses for research & test reactors Role of PRA in LBE selection - consider other aspects of PRA within licensing basis - through plant design and operation (not necessarily address here but lay potential groundwork)
Safety functions; required/supportive (p 23) - example of building a logic to determine scope and depth of content of other parts of SAR (e.g., system descriptions); see also discussions page 39 on design and performance requirements (see also § 4)
PRA technical adequacy (p29)
Discussion Topics 8
- Content needed regarding comparison/contrast to 10CFR50.69 and related processes (p 37)
- Barrier design requirements equivalent to or at least consistent with functional containment performance criteria ?
- Safety margins (p 43) - include engineering, reliability, and F-C targets (terminology vs existing use, usually related to engineering)
Discussion Topics 9
- Table 4-1 (p 45) - good summary but need some time to evaluate
- Adequacy of Defense in Depth (p 62) - Layer 4 does not necessarily require severe accident design features
- Accident sequence framework (p 66) similar to current activity NRC sponsoring at SNL (compare insights)
- Cliff edge (p 67) - do we need to describe in terms of loss of function when a hazard exceeds certain threshold
- Programmatic DID ( p 70) - good summary but need some time to evaluate
Discussion Topics 10 Supporting Discussion of criteria for classification as safety related
Format 11 Feb/March 2017 stakeholder meetings Supporting Discussion of safety focused reviews
12 Discussion