Fischer, U.

Kondo, K.

Liu, H.

Pereslavtsev, P.

Serikov, A.

English

KITopen

KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association Application of the R2Smesh approach for the accurate estimation of photon radiation dose fields around activated ITER in-vessel components Haibo LIU, Ulrich Fischer, Arkady Serikov, Pavel Pereslavtsev, Keitaro Kondo*  Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Karlsruhe, Germany 2. Neutron flux and activation calculations for the ITER in-vessel components  The blanket first wall module and the divertor cassette were analyzed.   The first wall geometric model [2] and the calculated decay gamma source 2D distribution are shown below. Fig. 1. ITER B-lite model with  layered FW Fig. 3. FW decay gamma source  distribution 3. Dose rate calculation  The ITER transfer cask is modeled as a 7 cm thick steel plate. The activated components were removed from the ITER model and integrated into this transfer cask model.   The associated decay gamma source distributions were transferred to the cask and overlaid to the geometric models of the activated components using the R2Smesh approach.   The photon transport geometric model and its dose rate map for the FW case and the divertor case are shown in the following figures.  Fig. 6. MCNP model of the transfer cask loaded with divertor cassette Fig. 7. Dose rate map around the cask 4. Summary The R2Smesh approach was utilized to assess the dose rate distribution around the ITER transfer cask loaded with activated in-vessel components. The results show that this approach is a versatile tool for performing such analyses. [1] M. Majerle, et al., Fusi. Engi. & Des. 87, 443-447, 2012.  [2] M. Sawan, Private Communications, ITER IDM, 9AWXY6, 2012. 1. Introduction The R2Smesh (“Rigorous 2-step”) approach [1] can be utilized to calculate photon radiation dose fields around activated components which are moved from the irradiation site in ITER to some external location. In this work, we applied the R2Smesh approach to dose rate analyses of ITER in-vessel components in a transfer cask. P3. 180 Fig. 4. MCNP model of the transfer cask loaded with four FW modules Fig. 2. Layered FW Fig. 5. Dose rate map around the cask  The dose rate level below the cask is much lower than above because of the 7 cm thick cask bottom steel plate shielding.   The relative errors for the dose rates are less than about 10% for most of the cask volume. * Now working at JAEA. Acknowledgments This work was funded by the ITER service contracts Nr. ITER/CT/13/4300000763. The support from Dr. Michael Loughlin and Dr. Miguel Dapena at ITER IO is appreciated. The views and opinions expressed herein do not necessarily reflect those of the ITER Organization. 28th Symposium on Fusion Technology, San Sebastian, Spain September 29th – October 3rd, 2014 Karlsruhe Institute of  Technology Institute for Neutron Physics and Reactor Technology  Hermann-von-Helmholtz-Platz 1  76344 Eggenstein-Leopoldshafen, Germany  Internet: http://www.kit.edu E-mail (H. Liu).: haibo.liu@kit.edu 

Application of the R2Smesh approach for the accurate estimation of photon radiation dose fields around activated ITER in-vessel components

https://publikationen.bibliothek.kit.edu/220097170/3816620

Application of the R2Smesh approach for the accurate estimation of photon radiation dose fields around activated ITER in-vessel components

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