| 摘要 |
The present invention relates to a method for copying a nuclear reactor subcritical core state using a neutron source term comprising; a first step of calculating a subcritical normal state neutron flux of a nuclear reactor using a second group time-space dependent three-dimensional neutron diffusion equation and a sixth group delayed neutron group balance equation; a second step of producing delayed neutron group number density, reactivity, and an ex-core detector signal under the transient state of the nuclear reactor by producing an arrangement for copying a subcritical transient state of the nuclear reactor and using a neutron flux as an initial value to solve a solution of an equation (6), wherein an upper subscript C is a central node; R and L are nodes which exist on a right side (R) and a left side (L) in x, y, z directions with the central node as the center point; a lower subscript 0 means a previous time step; and 1 means a current time step; and a third step of copying the transient state of the nuclear reactor based on the delayed neutron group number density, the reactivity, and the ex-core detector signal. |
