The uranium solution in the precipitation tank in the JCO's uranium conversion facility was analyzed in order to evaluate the total number of fissions in the criticality accident. Two analytical groups at JAERI performed chemical analyses independently in order to check the validity of the results: the concentration of the fission products (95Zr, 99Mo, 103Ru, 131I, 140Ba, etc), uranium, boron and impurity elements in the solution. The analytical results obtained by the two groups were almost in agreement within the analytical error. The number of fissions per one gram of uranium in the accident was determined to be (1.5 +/- 0.1 ) x 10(14). Also, the total number of events was evaluated to be (2.5 +/- 0.1) x 10(18) fissions using the total amount of uranium (16.6 kg) fed into the precipitation tank at the accident.
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In order to calculate criticality parameters of nuclear fuel solution systems, number densities of nuclides relating to the medium such as water or organic solvent are needed and generally calculated from density equations. Densities of uranyl nitrate-nitric acid and uranyl nitrate-gadolinium nitrate-,nitric acid solutions were precisely measured, and two empirical density equations for the solutions were derived as functions of concentrations of solutes, temperature and their products from regression analysis of a number of experimental data. The density equation for the solution of U0 2 (N0 3 h-HN0 3 was compared with published equations and discussed from the viewpoint of the atomic number density of hydrogen. Density equations for the solution of U0 2 (N0 3 h-Gd(N0 3 h-HN0 3 have not been reported so far and the effect of gadolinium on the hydrogen atomic number density in the uranium solution has been neglected. The present equation gives accurate number density in the relevant medium.
In order to calculate criticality parameters of nuclear fuel solution systems, number densities of nuclides relating to the medium such as water or organic solvent are needed and generally calculated from density equations.Densities of uranyl nitrate-nitric acid and uranyl nitrate-gadolinium nitrate-,nitric acid solutions were precisely measured, and two empirical density equations for the solutions were derived as functions of concentrations of solutes, temperature and their products from regression analysis of a number of experimental data.The density equation for the solution of U0 2 (N0 3 h-HN0 3 was compared with published equations and discussed from the viewpoint of the atomic number density of hydrogen.Density equations for the solution of U0 2 (N0 3 h-Gd(N0 3 h-HN0 3 have not been reported so far and the effect of gadolinium on the hydrogen atomic number density in the uranium solution has been neglected. The present equation gives accurate number density in the relevant medium.
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