Activation and Environmental Aspects of In-Vacuum Vessel Components of CFETR

ZHANG Xiaokang (张小康); LIU Songlin (刘松林); ZHU Qingjun (祝庆军); GAO Fangfang (高芳芳); LI Jia (李佳)

doi:10.1088/1009-0630/18/11/12

Plasma Science and Technology > 2016 > 18(11): 1130-1138. > DOI: 10.1088/1009-0630/18/11/12

ZHANG Xiaokang (张小康), LIU Songlin (刘松林), ZHU Qingjun (祝庆军), GAO Fangfang (高芳芳), LI Jia (李佳). Activation and Environmental Aspects of In-Vacuum Vessel Components of CFETR[J]. Plasma Science and Technology, 2016, 18(11): 1130-1138. DOI: 10.1088/1009-0630/18/11/12

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Activation and Environmental Aspects of In-Vacuum Vessel Components of CFETR

1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China 2University of Science and Technology of China, Hefei 230027, China

Funds: supported by National Special Project for Magnetic Confined Nuclear Fusion Energy of China (Nos. 2013GB108004, 2015BG108002, 2014GB122000, 2014GB119000), National Natural Science Foundation of China (No. 11175207)

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Received Date: December 15, 2015

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Abstract

Abstract

The water-cooled ceramic breeder (WCCB) blanket is one of the three candidates of China’s Fusion Engineering Test Reactor (CFETR). The evaluation of the radioactivity and decay heat produced by neutrons for the in-vacuum vessel components is essential for the assessment of radioactive wastes and the safety of CFETR. The activation calculation of CFETR in-vacuum vessel components was carried out by using the Monte Carlo N-Particle Transport Code MCNP, IAEA Fusion Evaluated Nuclear Data Library FENDL2.1, and the nuclear inventory code FISPACT-2007 and corresponding EAF-2007 libraries. In these analyses, the three-dimensional (3-D) neutronics model was employed and the WCCB blanket, the divertor, and the shield were modeled in detail to provide the detailed spatial distribution of the neutron flux and energy spectra. Then the neutron flux, energy spectra and the materials specification were transferred to FISPACT for the activation calculation with an assumed irradiation scenario of CFETR. This paper presents the main results of the activation analysis to evaluate the radioactivity, the decay heat, the contact dose, and the waste classification of the radioactive materials. At the time of shutdown, the activity of the WCCB blanket is 1.88×10¹⁹ Bq and the specific activity, the decay heat and the contact dose rate are 1.7×10¹³ Bq/kg, 3.05 MW, and 2.0×10³ Sv/h respectively. After cooling for 100 years, 79% (4166.4 tons) radioactive wastes produced from the blanket, divertor, high temperature shield (HTS) and low temperature shield (LTS) need near surface disposal, while 21% (1112.3 tons) need geological disposal. According to results of the contact dose rate, all the components of the blanket, divertor, HTS and LTS could potentially be recycled after shutdown by using advanced remote handling equipment. In addition, the selection of Eurofer97 or RAFM for the divertor is better than that of SS316 because SS316 makes the activity of the divertor-body keep at a relatively high level.
- CFETR,
- blanket,
- activation,
- radioactive waste

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References (1)

References

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