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[en] Summary: • Safety Approach and Design Conditions SDG: – Summarize general safety design approach and specific design consideration for reactivity issue and decay heat removal issue for Gen-IV SFR; – Design approach for DEC and PE is mainly addressed, since it could be important factors of design. » Passive/Inherent reactivity control and decay heat removal; » In-Vessel Retention; » Practical Elimination, e.g. complete loss of decay heat removal function, core uncovering.
[en] SDC Update: - The revised SDC report (Rev.1) submitted to EG members of GIF in October 2017. - The original SDC report was delivered to external entities for review such as national nuclear regulators and international organization in 2013. - The SDC TF received the comments from China's NNSA, USNRC, IAEA and IRSN. SDC TF has produced the revision of SDC as well as the resolution documents that include the response to the comment. - The revised SDC also reflects the revision of IAEA SSR 2/1.
[en] Safety Design Guidelines Development: Fundamental safety principles and common safety goals for all Gen-IV systems. A set of criteria reflecting GIF safety approach to achieve harmonized safety requirements of SFR system. A set of guidelines on how to implement the design criteria and address SFR-specific safety topics. Domestic regulations for design of reactor core, cooling system, and other structures, systems, and components.
[en] • Safety Design Approach shall be based on: (1) Defence in Depth; (2) Probabilistic and deterministic approaches; (3) Utilisation of passive safety features; (4) Prevention of cliff edge effect; (5) Containment function; (6) Provision against hazards; (7) Non-radiological and chemical risks
[en] Scope of SDG on Safety Approach: • This report is intended to provide recommendations and guidance on how to comply with the GIF SFR Safety Design Criteria. It presents examples for the measures stated in criteria as the best practices to help the designers achieve high levels of safety. • Initially, the guidelines will focus on specific safety concerns, such as reactivity characteristics of SFRs and heat removal issues. • To address the potential consequences of such accidents, this report focuses on providing examples of design approaches for ''prevention and mitigation of severe accidents'' and for ''loss-of-decay heat removal capability as a situation that needs to be practically eliminated''
[en] Conclusion Safety Design Approach for JSFR: • Based on the safety design criteria for Generation‐IV SFR; • DECs, Situations practically eliminated and related design measures are identified and selected with due consideration of the safety features of SFR and the lessons learned from the TEPCO’s Fukushima Dai‐ichi nuclear power plants accident. Safety Design Concept of JSFR: • For failure to shutdown: Passive shutdown capability, Mitigation of core damage (Prevention of severe mechanical energy release, In‐Vessel Retention); • For failure to remove heat: Prevention of significant core damage (Natural circulation DHR, Alternative cooling measures); • Containment: Prevention of sever dynamic loads by design measures (IVR, double boundary concept, inertization)
[en] The main objectives of this meeting/workshop are to: Discuss the development of the draft GIF report provisionally entitled Safety Design Guidelines on Key Structures, Systems and Components; Discuss the review comments of external stakeholders on GIF report on Safety Design Guidelines on Key Structures, Systems and Components; Discuss the development of the Safety Design Criteria and Safety Design Guidelines for lead and lead-bismuth cooled fast reactors; and Share information on the implementation of SDG for SFRs and SDC for LFRs by the designers of the innovative LMFR concepts.
[en] Concluding Remarks: • Key Structures, Systems and Components SDG: – Reactor Core; – Reactor Coolant System; – Reactor Containment System. • IAEA NS-G series are used as reference; • Discussion points are going to be identified based on the SFR characteristics; • Design specific issues such as small-large, oxide-metal, pool-loop) will be discussed.
[en] Scope of SDG on Safety Approach: • The objective of this report is to provide a set of guidelines to assist SFR developers in addressing the SDC in their design process for ensuring highest safety of their SFR designs. • Initially, the guidelines will focus on specific safety concerns, such as reactivity characteristics of SFRs and heat removal issues. • To address the potential consequences of such accidents, this report focuses on providing examples of design approaches for “prevention and mitigation of severe accidents” and for “loss-of-decay heat removal capability as a situation that needs to be practically eliminated”.
[en] • To achieve safety goals for Generation IV reactor, design measures should be taken under DECs including those for external events considering the lessons learned from the Fukushima Dai-ichi NPPs accident. • In particular, core cooling under long term loss of electric power or failure of auxiliary systems such as sea water cooling systems shall be ensured by utilizing diverse decay heat removal facilities. Alternative heat removal measures under core damage situations are needed to be considered. Also countermeasures against natural disasters beyond design basis shall be considered in design. • Concepts of design measure to meet these requirements were presented. International consensus for these kind of requirements and design concepts is necessary to ensure the global safety of the nuclear power.