Modular High Temperature Gas Cooled Reactor Safety Design

Closed for proposals

Project Type

Coordinated Research Project

Project Code

I31026

CRP

2081

Approved Date

12 December 2013

Status

3 - Active - Ongoing

Start Date

12 December 2014

Expected End Date

11 December 2018

Participating Countries

China
Germany
Indonesia
Japan
Kazakhstan
Republic of Korea
Ukraine
United Kingdom of Great Britain and Northern Ireland
United States of America

Description

The CRP will investigate and make proposals on modular high temperature gas cooled reactor (HTGR) safety design criteria. It is expected that these criteria would refer to light water reactor safety standards (e.g. Safety of Nuclear Power Plants: Design (IAEA Safety Standards Series No. SSR-2/1, Vienna, 2012)), and the deterministic and risk-informed safety design standards under development for existing and planned HTGRs worldwide that apply to the wide spectrum of design basis and beyond design basis events. The CRP would also take into account the effect of the Fukushima Daiichi accident, clarifying the safety requirements and safety evaluation criteria for design extension conditions, especially those events that can affect multiple reactor modules or are dependent on the application (such as process heat or hydrogen production) on the plant site. The logical flow of criteria is from the fundamental inherent safety characteristics of modular HTGRs and associated expected performance characteristics, to the safety functions required to ensure those characteristics, and finally to specific criteria related to those functions. The initial focus will be on the criteria for a specific HTGR concept (e.g. steam cycle) but other concepts (e.g. gas turbine and process heat) will also be looked at. Both prismatic and pebble bed modular HTGR designs will be considered. Several publications and presentations were identified as important input to the CRP and will be used as the point of departure. The results of the CRP will be documented in an IAEA Technical Document (TECDOC) to be made available to the entire HTGR community. The CRP could also provide technical information for future separate activities on the development of IAEA safety standards for HTGRs with the cooperation of the IAEA Department of Nuclear Safety and Security.

Objectives

To develop a process for establishing Safety Design Criteria at the plant and major Structure, System, and Component (SSC) level for modular HTGRs.? To Implement the process for representative modular designs. To establish the Safety Design Criteria for the representative designs, with associated technical background, so as to provide the technical information for the future separate activities of the development of IAEA Safety Standards for HTGRs with the cooperation of the department of Nuclear Safety and Security of IAEA.

Specific objectives

The CRP aims to reach consensus in the participating HTGR community on the specific Safety Design Criteria for Modular HTGRs.

The CRP aims to reach consensus in the participating HTGR community on the specific Safety Design Criteria for Modular HTGRs.

The specific inputs / outputs are to include: qualitative and quantitative top level safety requirements; comprehensive set of licensing basis events; identification of safety functions (of SSCs) during the events; the use of mechanistic source terms and uncertainty quantification

The specific inputs / outputs are to include: qualitative and quantitative top level safety requirements; comprehensive set of licensing basis events; identification of safety functions (of SSCs) during the events; the use of mechanistic source terms and uncertainty quantification

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