(FT/P2-7) Preliminary Safety Analysis for the Chinese ITER Dual-Functional Lithium-Lead Test Blanket Module

Hongli Chen1), Y. Wu, Y. Bai, L. Hu, M. Chen, Y. Song, Q. Zeng, S. Liu, FDS Team
 
1) Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China

Abstract.  Safety analysis is a part of the ITER Test Blanket Module (TBM) design process to ensure that the TBM does not adversely affect the safety of ITER. The TBM is subjected to special safety requirements and shall not compromise the safety objectives, principles, requirements and guidelines of ITER. To get the license for TBM as a whole with ITER, the relevant safety analysis is required for each TBM system proposed by each party. The safety analysis for the Chinese Dual-Functional Lithium-Lead Test Blanket Module (DFLL-TBM) has been performed based on the latest DFLL-TBM design. In this paper, the following safety considerations, such as source terms, operational releases, accident sequence analysis and waste assessment, have been analyzed. Source terms including tritium production, neutron activation products, energy and hydrogen, etc. have been first considered. Tritium release to the environment in normal operation and Occupational Radiation Exposure (ORE) assessment during the TBM maintenance procedure represent the important safety aspect, which should be less than the environmental criteria and dose limits. The accident sequences analysis covering all the accident scenarios envisaged in incidents and accidents have been completed to assess the ultimate safety margins of the DFLL-TBM. Both deterministic approach and complementary systematic approach starting with FMEA (Failure Mode and Effects Analysis) studies have been adopted in the accidental analysis. An assessment of waste arising during operations and decommissioning has been made to investigate the feasibility of recycling and clearance for the materials in the DFLL-TBM. The preliminary results show that the DFLL-TBM system at normal operating conditions and under accident scenarios don't add additional safety hazards to ITER machine and can meet the ITER safety requirement and additional safety requirements for TBM system. Keywords: DFLL-TBM; Safety analysis; Source terms; Accident sequence

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