JPS60156491U

JPS60156491U - fuel assembly

Info

Publication number: JPS60156491U
Application number: JP1984042795U
Authority: JP
Inventors: 忠弘池田
Original assignee: 株式会社東芝
Priority date: 1984-03-27
Filing date: 1984-03-27
Publication date: 1985-10-18

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の燃料集合の縦断面図、第２図は第１図の
燃料集合体に大径ウォータロッドを挿着した燃料集合体
の縦断面図、第３図は第２図のＡ−Ａ矢視断面図、第４
図は本考案に係る燃料集合体の一実施例を示す縦断面図
、第５図は第４図のＢ拡大図、第６図は第４図に示す冷
却材流拡散器の変更例を示すＢ部拡大図、第７図は本考
案に係る燃料集合体の他の実施例を示す縦断面図、第８
図は第７図のＣ部拡大図、第９図は第７図に示す冷却材
流拡散器の変更例を示すＣ部拡大図である。２・・・チャンネルボックス、３・・・燃料棒、９・・
・スペーサ、１４・・・冷却材導入口、１５・・・冷却
材流路、２１．３０・・・燃料集合体、２２・・・大径
ウォータロッド、２３・・・大径下部端栓、２４，３１
・・・下部タイプレート、２５，３２・・・上部支持部
、２６、２７．３３．３４・・・冷却材流拡散器。Fig. 1 is a longitudinal sectional view of a conventional fuel assembly, Fig. 2 is a longitudinal sectional view of a fuel assembly in which a large diameter water rod is inserted into the fuel assembly of Fig. 1, and Fig. 3 is a longitudinal sectional view of a fuel assembly of Fig. 2. -A cross-sectional view, 4th
The figure is a longitudinal sectional view showing one embodiment of the fuel assembly according to the present invention, FIG. 5 is an enlarged view of B in FIG. 4, and FIG. 6 is a modified example of the coolant flow diffuser shown in FIG. 4. FIG. 7 is a longitudinal sectional view showing another embodiment of the fuel assembly according to the present invention; FIG. 8 is an enlarged view of part B;
The figure is an enlarged view of section C in FIG. 7, and FIG. 9 is an enlarged view of section C showing a modification of the coolant flow diffuser shown in FIG. 7. 2...Channel box, 3...Fuel rod, 9...
- Spacer, 14... Coolant inlet, 15... Coolant channel, 21.30... Fuel assembly, 22... Large diameter water rod, 23... Large diameter lower end plug, 24, 31
. . . Lower tie plate, 25, 32 . . . Upper support portion, 26, 27. 33. 34 . . . Coolant flow diffuser.

Claims

[Scope of utility model registration request]

(1) A plurality of fuel rods, at least one water rod, an upper tie plate that supports the upper ends of the fuel rods and the water rods, and an upper tie plate that supports the lower ends of the fuel rods and the water rods and is located between the fuel rods. A lower tie plate has a coolant flow path for guiding the coolant and a coolant inlet for introducing the coolant into the coolant flow path, and fuel rods are arranged at appropriate intervals between the upper and lower tie plates. In a fuel assembly in which a plurality of spacers are housed in a channel box and spacers are held at appropriate intervals, a coolant flow diffuser is integrally formed with the lower tie plate in the coolant flow path of the lower tie plate by casting. A fuel assembly characterized by:

(2) The coolant flow diffuser formed in the lower tie plate is formed at the lower part of the water rod disposed at the center of the fuel assembly, as set forth in claim 1 of the utility model registration claim. fuel assembly.

(3) The fuel assembly according to claims 1 and 2 of the utility model registration claim, wherein the coolant flow diffuser formed on the lower tie plate is formed under the plurality of fuel rods. .

(4) The coolant flow diffuser formed in the lower tie plate is larger than the coolant flow diffuser formed in the lower part of the water rod than the coolant flow diffuser formed in the lower part of the plurality of fuel rods. The fuel assembly according to claim 3 of the utility model registration claim, characterized in that:

(5) A utility model characterized in that the coolant flow diffuser formed in the lower tie plate is formed in a conical or streamlined shape, and the tip is directed toward the coolant inlet of the lower tie plate. A fuel assembly according to registered claims 1, 2, 3 and 4.