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[en] Overview in INPRO draft manual on nuclear reactor safety: • Proposed simplification of structure of methodology: – Reduction of number of basic principles from four to one; – Reduction of number of user requirements from 14 to 10 (by combining); – Elimination of overlapping criteria in different user requirements; and – Elimination of overlap with area of environmental impact of stressors (assessment of public exposure at normal operation conditions and AOO). • By request, inclusion of safety culture into the safety manual (removed from the manual on infrastructure).
[en] A diagram presents the whole of the works that will be made on the French fleet of nuclear reactors. The diagram includes the works necessary for the decenal reviews, the lifetime extension projects, usual reactor maintenance and the post-Fukushima measures. (A.C.)
[en] Conclusion: • Since there are various technical choices, safety design standard for Gen-IV reactors should include commonly applicable, technology-neutral criteria. • Appropriate combination of deterministic and risk-informed approach should be pursued aiming at rational safety design. • Since SFR and LFR have common aspects as LMFR, consistency as LMFR safety design criteria is important in SFR SDC and LFR SDC. • On the other hand, clarification of SFR and LFR specific safety design criteria is also important.
[en] Background: In the TWG-GCR a clear need has been identified by the MS to develop mHTGR Safety Design Criteria. The development and implementation of comprehensive safety design criteria (SDC) that take HTGR-specific characteristics into account would provide a high level of assurance that modular HTGRs are consistently designed, constructed, and operated in a manner that takes advantage of these intrinsic properties, while also avoiding unintended compromises in plant safety.
[en] The article describes the properties and (potential) benefits of small modular reactors (SMRs), current situation (SMRs in use, in construction, to be started up soon, under development, micro-SMRs), and examples (Akademik Lomonosov floating NPP, NuScale Power). (P.A.)
[en] • Sodium Technology: – Safe and efficient handling and processing of sodium is very important for SFR technology; – Technical sessions would be organized to share current best practices on sodium technology. • Harmonizing Safety Frameworks and Standards: – Safety frameworks and safety design standards are very important for public acceptance and have a major influence on design criteria for SFRs; – Technical sessions would be organized to explore national approaches with a view toward harmonization.
[en] Proposals of Topics for SFR Workshop: • In the 1st WS, the necessity of information exchange by experts on technical issues such as sodium reaction and passive safety was pointed out. It is expected to hold such expert meeting. • For future SFR Workshops which policy makers and experts participate in, the following issues may be suited: – Crosscutting issues on SFR safety; – Instructive Issues for the demonstration of SFR
[en] CRP-5 Objectives: • Validation of analytical codes and performance models to actual operating conditions of HTGRs, • Independent evaluation of benchmark problems for use in the R&D and safety programmes for the HTR-10, PBMR, GT-MHR and the ASTRA facilities, • Investigation of analytical codes and models associated with the proposed GT-MHR and PBMR-400 gas turbine plants • Investigation of code-to-experiment benchmarks associated with the three shaft gas turbine micro-model (PBMM), and • Demonstration of HTGR safety characteristics.
[en] Safety and Operation Project: Objectives – Analyses and experiments that support safety approaches and validate specific safety features; – Development of computational tools useful for such studies; – Acquisition of reactor operation technology, as determined largely from experience and testing in operating SFR plants.