Dose Rate Analyses around the Equatorial and Divertor Ports during ITER In-Vessel Components Maintenance

The shutdown dose rates around the equatorial and divertor maintenance ports of ITER were evaluated with the 2-D/3-D combined approach, using the three-dimensional continuous-energy Monte Carlo code, MCNP-4B and the two-dimensional discrete ordinate code, DOT3.5. The neutron flux-to-shutdown dose ra...

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Bibliographic Details
Published inJournal of nuclear science and technology Vol. 37; no. sup1; pp. 248 - 252
Main Authors Mori, S, Ito, A, Sato, S, Ako, K, Tada, E, Shibanuma, K, Hattori, Y, Iida, H
Format Journal Article
LanguageEnglish
Published Taylor & Francis 01.03.2000
Subjects
Discrete ordinate method
Divertor
Dose rate
Fusion reactor
Induced activity
ITER
Maintenance
Monte Carlo method
Neutron Streaming
Shield
Tokamak
Vacuum vessel ports
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Summary:The shutdown dose rates around the equatorial and divertor maintenance ports of ITER were evaluated with the 2-D/3-D combined approach, using the three-dimensional continuous-energy Monte Carlo code, MCNP-4B and the two-dimensional discrete ordinate code, DOT3.5. The neutron flux-to-shutdown dose rate conversion factor is derived with the two-dimensional geometry using the THIDA code system and the assumed operation scenario, i.e. the neutron fluence of 0.3 MWa/m 2 in ten years of operation. The dose rate around the equatorial and divertor ports after 10 6 seconds (11.6 days) after reactor shutdown ranges from 100 to 200 μ Sv/h. Attempts to further reduce the dose rate by improving the shield design were made to follow the principle of ALARA.
ISSN:0022-3131
1881-1248
DOI:10.1080/00223131.2000.10874884