Estimation of thermochemical behavior of spallation products in mercury target

Kobayashi, Kaoru*; Kaminaga, Masanori; Haga, Katsuhiro; Kinoshita, Hidetaka; Aso, Tomokazu; Teshigawara, Makoto; Hino, Ryutaro

JAERI-Tech 2002-005, 118 Pages, 2002/02

JAERI-Tech-2002-005.pdf:9.71MB

In order to examine the radiation safety of a spallation mercury target system, it is necessary to clarify the chemical forms of spallation products generated by spallation reaction with proton beam. As for the chemical forms of spallation products in mercury that involves large amounts of spallation products, these forms were estimated by using the binary phase diagrams and the thermochemical equilibrium calculation based on the amounts of spallation product. Calculation results showed that the mercury would dissolve Al, As, B, Be, Bi, C, Co, Cr, Fe, Ga, Ge, Ir, Mo, Nb, Os, Re, Ru, Sb, Si, Ta, Tc, V and W in the element state, and Ag, Au, Ba, Br, Ca, Cd, Ce, Cl, Cs, Cu, Dy, Er, Eu, F, Gd, Hf, Ho, I, In, K, La, Li, Lu, Mg, Mn, Na, Nd, Ni, O, Pb, Pd, Pr, Pt, Rb, Rh, S, Sc, Se, Sm, Sn, Sr, Tb, Te, Ti, Tl, Tm, Y, Yb, Zn and Zr in the form of inorganic mercury compounds.

Chemical impacts of boron on the cesium release and transport behavior under severe accident conditions, 1; Prediction of chemical forms of cesium just after release from fuel in the presence of boron

Miwa, Shuhei; Yamashita, Shinichiro; Osaka, Masahiko

no journal, , 

The effects of temperature and atmosphere on cesium (Cs) chemical form just after release from fuel were estimated using chemical equilibrium calculation with consideration of the release kinetics of Cs, iodine (I), boron (B) and so on depending on temperature and atmosphere under a severe accident. The calculation results show that Cs vapor species changed according to temperature and atmosphere, and CsBO vapor species was dominant with the existence of B regardless of temperature and atmosphere.