JPS59158093U

JPS59158093U - nuclear fuel assembly

Info

Publication number: JPS59158093U
Application number: JP1983051500U
Authority: JP
Inventors: 直奈良林
Original assignee: 株式会社東芝
Priority date: 1983-04-08
Filing date: 1983-04-08
Publication date: 1984-10-23

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 the drawing]

第１図は従来の核燃料集合体を示すもので同図ａは一部
を切欠いて内部構造を示した斜視図、同図すは断面図、
第２図は従来の原子炉炉心を示す概略断面図、第３図は
本考案による核燃料集合体の一実施例で同図ａは断面図
、同図すは平面図、第４図は第３図すに示す上部タイプ
レートを示す平面図、第５図は同じく格子状金属板スペ
ーサを示す平面図、第６図は第５図に示す挿入筒の構造
を示す斜視図、第７図から第９図は本考案の作用効果を
説明するための曲線図で、第７図は落下水流量比と上部
タイプレート流路面積比との関係を、第８図は被覆管の
温度減少と上部タイプレート流−路面積比との関係を、
第９図は圧力損失の変化割合と上部タイプレート流路面
積比との関係をそれぞれ示している。１・・・核燃料集合体、２・・・ハンドル、３・・・燃
料チャンネル、４・・・上部タイプレート（従来型）、
５・・・タイロッド、６・・・下部タイプレート、７・
・・燃料棒、８・・・ポスト、９・・・グリッドスペー
サ、１０・・・−圧力容器、１０ａ・・・炉心、１１・
・・スプレィスパージャ、１２・・・下部プレナム、１
３・・・上部タイプレート、１４・・・格子状金属板ス
ペーサ、１５・・・取付ネジ、１６・・・挿入筒、１７
・・・切り込み、１８・・・板バネ。′ 第１図第３図Figure 1 shows a conventional nuclear fuel assembly, in which figure a is a partially cutaway perspective view showing the internal structure, figure a is a cross-sectional view,
Fig. 2 is a schematic sectional view showing a conventional nuclear reactor core, Fig. 3 is an embodiment of a nuclear fuel assembly according to the present invention; 5 is a plan view showing the lattice metal plate spacer, FIG. 6 is a perspective view showing the structure of the insertion tube shown in FIG. 5, and FIGS. Figure 9 is a curve diagram to explain the effects of the present invention, Figure 7 shows the relationship between the falling water flow rate ratio and the upper tie plate flow path area ratio, and Figure 8 shows the relationship between the temperature reduction of the cladding pipe and the upper type. The relationship between rate flow and path area ratio is
FIG. 9 shows the relationship between the rate of change in pressure loss and the upper tie plate flow path area ratio. 1... Nuclear fuel assembly, 2... Handle, 3... Fuel channel, 4... Upper tie plate (conventional type),
5...Tie rod, 6...Lower tie plate, 7.
...Fuel rod, 8...Post, 9...Grid spacer, 10...-Pressure vessel, 10a...Reactor core, 11.
...Spray sparger, 12...Lower plenum, 1
3... Upper tie plate, 14... Grid metal plate spacer, 15... Mounting screw, 16... Insertion tube, 17
...notch, 18...plate spring. ' Figure 1 Figure 3

Claims

[Claims for Utility Model Registration] (1) A cylindrical fuel channel, an upper tie plate and a lower tie plate that are fitted above and below the fuel channel, and which are spaced apart along the axial direction inside the fuel channel. In the fuel assembly, the fuel assembly is composed of a plurality of spacers installed in the spacer, and a plurality of fuel rods that pass through the spacers and are restrained at both ends by the upper and lower tie plates. The fuel assembly is fixed to the lower tie plate 4, and the upper tie plate is formed in a shape in which only the outer frame and handle are left and other parts are removed. (The nuclear fuel assembly according to claim 1, wherein the upper tie plate is fixed to the lower side of the lower tie plate with a screw. The nuclear fuel assembly according to claim 1 of the utility model registration claim, characterized in that the nuclear fuel assembly is fixed to the side surface with screws. (4) The nuclear fuel assembly is completely fixed by being screwed into the lower tie plate. The nuclear fuel assembly according to claim 1 of the utility model registration claim. (5) The upper tie plate has a lattice-shaped metal plate spacer.
A nuclear fuel assembly according to claim 1 of the utility model registration claim, characterized in that: is incorporated therein.