| 摘要 |
PROBLEM TO BE SOLVED: To provide the simple, efficient evaluating method for change in concentration of atomic-fuel material, which can evaluate the concentration of a respective nuclear species by analytical computation and has the short time required for the computation. SOLUTION: In the evaluating method for the change in concentration of atomic-fuel material, which evaluates the concentration of the atomic-fuel material that is changing by the unclear fission, neutron capture, radioactive decay and the like accompanied by the irradiation of neutrons, the arbitrary nuclear species on a nuclear transformation chain is determined as the reference nuclear species. The concentration of another respective nuclear K-species with respect to the concentration of this reference nuclear species is given by the analytical formula, which is expressed by ratio of the cross section area of the neutron unclear reaction of each nuclear species with respect to the cross section rear of the neutron nuclear reaction of the reference nuclear species and the function of the concentration of the reference nuclear species. The concentration of the other respective nuclear species is analytically obtained by giving the arbitrary concentration of the reference nuclear species into the analytical formula.
|
