Shutdown dose rate analysis of European test blanket modules shields in ITER Equatorial Port #16

Juárez, R.; Sauvan, P.; Perez, Lucia; Panayotov, D.; Vallory, Joelle; Zmítko, M.; Poitevin, Y.; Sanz, J.

doi:10.1016/j.fusengdes.2015.11.023

Cited by 12 publications

(7 citation statements)

References 4 publications

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“…For the time being, different mechanisms are responsible for the high SDDR in the equatorial port interspaces: (i) crosstalks from neighbor ports [3,4], (ii) leakage through the port plug gaps and through BSMs and VV activating the port duct [5][6][7], and (iii) the neutron transmission through the port plugs. In other words, the transmission through the port plug is just another contributor to the radiation background in the interspace.…”

Section: Propagation Of Sddr Limit To Dsm Designmentioning

confidence: 99%

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The use of the long modular diagnostics shield module to mitigate shutdown dose rates in the ITER diagnostics equatorial ports

et al. 2018

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The ITER equatorial port plugs are submitted to a drained weight limit of 45 T. This limitation can conflict with their radiation shielding demands, although some weight margin is being discussed. The port interspaces are subject to a shutdown dose rate limit of 100 µSv h −1 after 10 6 s of cooling time. To meet it, the port plugs must show a neutron flux attenuation comparable to their neighborhood, despite considering penetrations to host systems. Most of this task relies on the drawer shield module (DSM). In this work, two DSM concepts are analyzed with this perspective: the box-based DSM and the modular DSM. Regardless the penetrations, the box-based DSM leads to unsatisfactory port plugs to meet both weight and SDDR requirements. On the contrary, the modular DSM shows a performance which allows for the adoption of such DSM concept, or equivalent, a port may comply with both requirements at the same time, provided the penetrations are well designed.

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Section: Propagation Of Sddr Limit To Dsm Designmentioning

confidence: 99%

“…The plasma neutrons background in the ITER interspace was high enough to conflict in some cases with SDDR limit [7]. This is the reason why different actions to reduce the background in the interspace are in implementation.…”

Section: Propagation Of Sddr Limit To Dsm Designmentioning

confidence: 99%

The use of the long modular diagnostics shield module to mitigate shutdown dose rates in the ITER diagnostics equatorial ports

et al. 2018

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“…The situation in the ITER EPs is particularly challenging, due to their proximity to the plasma, the port plug weight restrictions, the limited space for shielding and the relative orientation with respect to the plasma. A collection of works showing current status is [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Large efforts to reduce the SDDR in the ITER port interspaces have been devoted to improve the design of the port plugs as understood from works [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In example, for Diagnostics port plugs, works to develop a long diagnostics shield module (DSM) for a satisfactory port plug integration are in progress [17].…”

Section: Introductionmentioning

confidence: 99%

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Scoping studies of shielding to reduce the shutdown dose rates in the ITER ports

et al. 2018

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The planned in situ maintenance tasks in the ITER port interspace are fundamental to ensure the operation of equipment to control, evaluate and optimize the plasma performance during the entire facility lifetime. They are subject to a limit of shutdown dose rates (SDDR) of 100 µSv h−1 after 106 s of cooling time, which is nowadays a design driver for the port plugs as well as the application of ALARA. Three conceptual shielding proposals outside the ITER ports are studied in this work to support the achievement of this objective. Considered one by one, they offer reductions ranging from 25% to 50%, which are rather significant. This paper shows that, by combining these shields, the SDDR as low as 57Δ µSv h−1 can be achieved with a local approach considering only radiation from one port (no cross-talk form neighboring ports). The locally evaluated SDDR are well below the limit which is an essential pre-requisite for achieving 100µSv h−1 in a global analysis including all contributions. Further studies will have to deal with a realistic port plug design and the cross-talks from neighbour ports.

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Design activities toward the achievement of the conceptual phase of the EU-TBM sets

Vallory

Panayotov

Zmítko

et al. 2016

Fusion Engineering and Design

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Shutdown dose rate analysis of European test blanket modules shields in ITER Equatorial Port #16

Cited by 12 publications

References 4 publications

The use of the long modular diagnostics shield module to mitigate shutdown dose rates in the ITER diagnostics equatorial ports

The use of the long modular diagnostics shield module to mitigate shutdown dose rates in the ITER diagnostics equatorial ports

Scoping studies of shielding to reduce the shutdown dose rates in the ITER ports

Design activities toward the achievement of the conceptual phase of the EU-TBM sets

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