First neutronics analysis for ITER bio-shield equatorial port plug

被引:4
作者
Dang, Tongqiang [1 ,2 ]
Ying, Dongchuan [2 ]
Yang, Qi [1 ,2 ]
Loughlin, Michael [3 ]
Davis, Andrew [4 ]
机构
[1] Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230027, Anhui, Peoples R China
[2] Chinese Acad Sci, Inst Nucl Energy Safety Technol, Hefei 230027, Anhui, Peoples R China
[3] ITER Org, F-13115 St Paul Les Durance, France
[4] EURATOM CCFE Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England
关键词
ITER; Bio-shield plug; Port cell; Gamma dose rate; CAD-based Multi-Functional 4D Neutronics; Simulation System; DESIGN;
D O I
10.1016/j.fusengdes.2012.03.036
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
ITER equatorial port cell outside the bio-shield plug is a place to allow personnel access after shutdown that accommodates various sensitive equipment and pipes. Gamma dose rate after shutdown of 1 day in the port cell should be within 10 mu Sv/h for occupational safety which is one order of magnitude less than that in the port interspace by the shielding of bio-shield plug. To verify the shielding property of the bio-shield plug, the distributions of gamma dose rates in port cell were studied. Based on the ITER neutronics model Alite4 which is a three-dimensional ITER tokomak neutronics model for MCNP calculations with a 40 degree extent in the toroidal direction and vertical reflecting bounded planes on both sides, the equatorial port was updated according to a conceptual CAD model using Monte Carlo Automatic Modeling Program for Radiation Transport Simulation (MCAM). A 2-step method of gamma dose rate calculation was used for shutdown dose rates in CAD-based Multi-Functional 4D Neutronics Simulation System (VisualBUS). The result showed that gamma dose rates in the port cell were higher than the desired limit. Refinements to the bio-shield plug design were suggested to ensure that dose rates in the port cell were within the design value for maintenance access. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:1447 / 1452
页数:6
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