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Additional info for Advances in Control Assembly Mtls for Water Reactors (IAEA TECDOC-813)
The reactions of HfB2 with the cladding materials (steel, hafnium) are not known. It can however be deduced from the equilibrium phases diagrams that the reactions should occur at high temperatures (HfB2-Fe eutectic at 1265 °C, HfB2~Hf eutectic at 1800 °C). R. in the seventies , . In Vallecitos, different high density borides pellets (table 3) have been irradiated in the 350-500 °C temperature range in the GETR high flux reactor. The results show that, even though all the materials are extensively cracked, the diborides and particularly HfB2, have a relatively low swelling rate and second have the lowest helium release rate during subsequent annealings (figure 1).
Armand Hafnium et zirconium et leurs applications nucléaires Electro-nucléaire (1966)  R. Tricot Elaboration et propriétés d'emploi du hafnium SFEN meeting, Paris (Nov. C. Schouler, M. Ducarroir, C. Bernard Mise au point sur la topographie et les propriétés des systèmes métal-carbone-azote M-C-N et M-C-Bore Rev. Int. Htes Temp. Réfr. , 20, 261-311 (1983) 58  D. Gösset, B. Kryger, GM Decroix Improvement of the thermo-mechanical properties of boron-rich compounds llth Int. Symp. Boron ISBB 93, Tsukuba (Japon), Aug.
The gap between these two volumes corresponds to a gas jet whose conductivity can be varied continuously during irradiation, by adjusting the helium and nitrogen content. The heating of the absorber rodlets arises from two sources : the10B (n,a)7Li reaction on one hand, the gamma radiation generated from the structures of the capsule on the other hand. The regulation of temperature is obtained by adjustment of the content of a gas gap as mentioned above. The temperatures of the rodlets have TABLE II : IRRADIATION CONDITIONS OF THE EXPERIMENT 1 2 3 122 122 122 45 50 50 0) 39 42 42 • MASS SPECTROMETRY (2) 22 32 32 ABSORBER RODLET Irradiation time days Average burn-up in 1020 capt/cm3 • CALCULATION • DOSIMETRY Températures °C • B4C PELLETS (3) 430-510 485-540 480-540 • CLAD (3) 320-350 340-380 340-380 From AI-Co dosimeter inserted in the capsule From mass spectrometry measurements of the 10B/11B ratio after irradiation From thermocouples measurements of the clad external temperature during irradiation.