Method of synthesizing reactor core power distribution for reactor core protection system based on in-core instrument signal using ordinary kriging method

A method of synthesizing reactor core power distribution for a reactor core protection system based on an in-core instrument signal using an ordinary kriging method, the method comprising steps of:

• (a) calculating a power of all fuel assemblies in a reactor core from powers of fuel assemblies in which in-core instruments are located using the ordinary kriging method;
• (b) obtaining axial power distribution of a node for each fuel assembly by artificial neural network synthesis of axial power distribution based on results of step (a);
• and
• (c) obtaining hot-pin power distribution of the node for each fuel assembly by multiplying the axial power distribution of the node obtained in step (b) by a 1-pin correlation factor obtained from a reactor core design code and a ratio of the powers of the fuel assemblies to an average power of an entire reactor core,
• wherein in step (c), the hot-pin power distribution of the node is calculated by multiplying the axial power distribution of the node by the ratio of a power of the fuel assembly to the average power of the entire reactor core and the 1-pin correlation factor corresponding to the node, as in the following equation,
• PD
• jl
• =
• FZ
• jl
• ×
• ∑
• k
• =
• 1
• 5
• ⁢
• P
• jk
• P
• AVG
• ×
• [
• (
• 1
• -
• pin
• )
• /
• RPF
• ]
• jl
• ,
• [
• Equation
• ]
• wherein PDjl is the hot-pin power of an lth node of a jth fuel assembly, FZjl is the axial power distribution of the lth node of the jth fuel assembly, Pjk is a calculated power of a kth level of the jth fuel assembly, PAVG is the average power of the entire reactor core, and [(1−Pin)/RPF]jl is the 1-pin correlation factor corresponding to the lth node of the jth fuel assembly.