JP2016125971A5

JP2016125971A5 -

Info

Publication number: JP2016125971A5
Application number: JP2015001951A
Authority: JP
Filing date: 2015-01-08
Publication date: 2017-10-05
Anticipated expiration: 2035-01-08

Description

また、本発明の原子炉の燃料集合体装荷方法は、（全燃料集合体体数）／（新燃料集合体体数）をＭとしたとき、ＮはＮ≦Ｍを満たす最大の自然数であり、炉心の最外周に配される燃料集合体の外接円の半径をＲとしたとき、前記外接円と同心円状で且つ、半径を略（Ｒ−４５ｃｍ）とする境界領域を設定し、前記境界領域は内側炉心領域と外側炉心領域とを画定するものであり、前記外側炉心領域に配される燃料集合体は、炉内滞在期間が第Ｎ＋２サイクル目以上の燃料集合体を少なくとも１体以上含み、且つ、（第Ｎ＋２サイクル目以上の燃料集合体体数）／（第Ｎ＋１サイクル目以上の燃料集合体体数）が０.６以下の関係を満たす原子炉炉心への燃料装荷方法であって、所定期間原子炉を運転した後、次の運転サイクルに移行する前に、前記外側炉心領域に配される燃料集合体のうち、第Ｎ＋２サイクル目の燃料集合体を前記原子炉外に取り出し、前記外側炉心領域に配される燃料集合体のうち、第Ｎ＋１サイクル目の燃料集合体は移動することなく、同一位置に配することを特徴とする。 Further, in the nuclear fuel assembly loading method of the present invention, when (total number of fuel assemblies) / (number of new fuel assemblies) is M, N is the maximum natural number satisfying N ≦ M. , when the radius of the circumscribed circle of the fuel assemblies disposed in the outermost periphery of the furnace center is R, and in the circumscribed circle and concentric sets a boundary region whose radius substantially (R-45cm), the The boundary region defines an inner core region and an outer core region, and the fuel assemblies arranged in the outer core region have at least one fuel assembly having a stay in the reactor of the N + 2th cycle or more. And a method of loading fuel into a nuclear reactor core that satisfies the following relationship: (number of fuel assemblies in the (N + 2) th cycle or more) / (number of fuel assemblies in the (N + 1) th cycle or more) After operating the reactor for a predetermined period, before moving to the next operation cycle The fuel assembly at the (N + 2) th cycle among the fuel assemblies arranged in the outer core region is taken out of the reactor, and the N + 1th cycle among the fuel assemblies arranged in the outer core region. The fuel assemblies are arranged at the same position without moving.

Claims

A nuclear reactor core loaded with a plurality of fuel assemblies,
When (total number of fuel assemblies) / (number of new fuel assemblies) is M, N is the maximum natural number that satisfies N ≦ M, and circumscribes the fuel assemblies arranged on the outermost periphery of the core. When a radius of a circle is R, a boundary region that is concentric with the circumscribed circle and has a radius of approximately (R-45 cm) is set, and the boundary region defines an inner core region and an outer core region And
The fuel assemblies arranged in the outer core region include at least one fuel assembly having a stay in the reactor of the (N + 2) th cycle or more, and (the number of fuel assemblies in the (N + 2) th cycle or more) / A reactor core characterized in that the number of fuel assemblies in the (N + 1) th cycle or more satisfies a relationship of 0.6 or less.

The reactor core according to claim 1,
The nuclear reactor core according to claim 1, wherein the new fuel assembly is disposed in the inner core region and the outer core region other than the outermost periphery.

The reactor core according to claim 1,
In the inner core region, four fuel assemblies having the same staying period in the reactor adjacent to each other are arranged, and the arrangement positions of the four fuel assemblies are the same in a plurality of operation cycles. Reactor core.

3. The nuclear reactor core according to claim 2, wherein the fuel assemblies are arranged in the outer core region, and a predetermined number of the fuel assemblies arranged in the outermost periphery are in a plurality of operating cycles. A reactor core characterized in that the in-stay period is the same and the arrangement position is also the same.

In the nuclear reactor core according to claim 3,
The four fuel assemblies arranged adjacent to each other are fuel assemblies whose stay in the reactor is in the (N + 1) th cycle.

In the nuclear reactor core according to claim 4,
A nuclear reactor core characterized in that a predetermined number of fuel assemblies among the fuel assemblies arranged on the outermost periphery are fuel assemblies having a stay in the reactor at the (N + 1) th cycle.

In the nuclear reactor core according to claim 5 or 6,
The nuclear reactor core characterized in that N is 2 or less.

When the (total fuel assemblies number form) / (the new fuel assemblies number body) M, N is the largest natural number satisfying N ≦ M, circumscribing the fuel assemblies disposed in the outermost periphery of the furnace center When a radius of a circle is R, a boundary region that is concentric with the circumscribed circle and has a radius of approximately (R-45 cm) is set, and the boundary region defines an inner core region and an outer core region And
The fuel assemblies arranged in the outer core region include at least one fuel assembly having a stay in the reactor of the (N + 2) th cycle or more, and (the number of fuel assemblies in the (N + 2) th cycle or more) / A fuel loading method to a nuclear reactor core satisfying a relationship of (number of fuel assemblies in the (N + 1) th cycle or more) of 0.6 or less,
After operating the reactor for a predetermined period, before shifting to the next operation cycle, out of the fuel assemblies arranged in the outer core region, the fuel assembly at the (N + 2) th cycle is taken out of the reactor,
A fuel assembly loading method for a nuclear reactor, wherein, among the fuel assemblies arranged in the outer core region, the fuel assembly of the (N + 1) th cycle is arranged at the same position without moving.

The method of loading a fuel assembly for a nuclear reactor according to claim 8,
After operating the nuclear reactor for a predetermined period, before moving to the next operation cycle, the new fuel assembly is loaded at a predetermined position in the outer core region other than the inner core region and the outermost periphery. Reactor fuel assembly loading method.

The method of loading a fuel assembly for a nuclear reactor according to claim 8,
After operating the reactor for the predetermined period, before moving to the next operation cycle, the fuel assemblies in the four (N + 1) th cycles in the reactor stay period adjacent to the inner core region were arranged. A fuel assembly loading method for a nuclear reactor, comprising moving an Nth cycle fuel assembly to a position.