Summary report for ITER task - D4: Activation calculations for the lithium vanadium ITER design

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Abstract
Detailed activation analysis for ITER has been performed as a part of ITER Task D4. The calculations have been performed for the shielding blanket (SS/water) and for the breeding blanket (Li/V) options. The activation code RACC-P, which has been modified under ITER Task-D-10 for pulsed operation, has been used in this analysis. The spatial distributions of the radioactive inventory, decay heat, biological hazard potential, and the contact dose were calculated for the two designs for different operation modes and targeted fluences. A one-dimensional toroidal geometrical model has been utilized to determine the neutron fluxes in the two designs. The results are normalized for an inboard and outboard neutron wall loading of 0.91 and 1.2 MW/m{sup 2}, respectively. The point-wise distributions of the decay gamma sources have been calculated everywhere in the reactor at several times after the shutdown of the two designs and are then used in the transport code ONEDANT to calculate the biological dose everywhere in the reactor. The point-wise distributions of all the responses have also been calculated. These calculations have been performed for neutron fluences of 3.0 MWa/m{sup 2}, which corresponds to the target fluence of ITER, and 0.1 MWa/m{sup 2}, which is anticipated to correspondmore » to the beginning of the extended maintenance period. The decay heat results show that a large fraction of this energy (50 to 90%) Is produced by photons. This implies that this energy would be transported to different parts of the reactor, thus relieving the energy concentration at high intensity source locations such as the first wall. Accurate modeling for the decay gamma transport is required to produce realistic spatial distribution of the decay heat which may be used in LOCA and LOFA analyses. The results of the pulsed operation, using the new version of RACC, show large reductions in the radioactivity and the decay heat for pure pulsed operation. « less

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