ECN publication
Neutron metrology in the HFR: MINiaturized cOmpact tenSion SpEcimens irradiation R301-02 (MINOSSE-2)
Published by: Publication date:
ECN NUC 1-2-1999
ECN report number: Document type:
ECN-I--98-065 Other
Number of pages: Full text:
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Within the framework of the European Fusion Technology Programme, NRGPetten is investigating the irradiation behaviour of structural materials for advanced next-step fusion devices. The irradiation of specimen holder R301-02 (MINOSSE) in the HFR Petten, loaded with sixteen coupon plates (thickness 1-2.5 mm) and twenty reduced size CT-specimens (thickness 2.5 mm) manufactured from two types of ferritic/martensitic steel alloys, is part of this programme. The R301-02 assembly was irradiated in the channels 1 and 2 of TRIO type facilities for sixteen HFR operation cycles, subsequently in the core-positions C3 and C7 (last four cycles), up to a target dose level of 10 displacements per atom (dpa) in steel at a nominal target temperature of 300 deg C. This report presents the final metrology results obtained from activation monitor sets placed inside the specimen holder, including the thermal and fast neutron fluences, displacements per atom and the generated helium content. Additionally detailed information concerning an estimation of the fluence and damage doses received by each specimen and its temperature during irradiation are presented. The main results of the thermal and fast neutron fluence measurements, indicate that the obtained damage levels in the steel specimens loaded in this specimen holder vary from 6.3 and 10.5 dpa. The median temperatures of the specimen during the irradiation ranged mainly between 276 and 310 deg C. Especially the upper specimen temperatures reached the target temperature for the specimen holder. Detailed data are presented in the tables 3, 4 and 5, as well as in figure 2. 16 refs.

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