Bottom nozzle of nuclear reactor fuel assembly

A fuel assembly and reactor technology, applied in the assembly of fuel elements, reducing greenhouse gases, nuclear power generation, etc., can solve the problems of increased hydraulic resistance coefficient and increased vibration load of fuel elements, and achieve the effect of reducing vibration load and hydraulic resistance

Pending Publication Date: 2021-06-11
TVEL RUSSIAN FEDERATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the tail end of this fuel assembly is that when the anti-debris filter is installed, the passage section is reduced, and there is a shadow part of the coolant flow at the joint of the fins, and the connection betwee

Method used

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  • Bottom nozzle of nuclear reactor fuel assembly
  • Bottom nozzle of nuclear reactor fuel assembly
  • Bottom nozzle of nuclear reactor fuel assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The tail end 1 of the reactor fuel assembly 2 comprises a coaxial interconnected support element 3 , a diffuser 4 and a hexagonal frame 5 .

[0026] The non-adjacent corners of the hexagonal frame 5 are fixed at offsets from the plane of angular symmetry of the variable height fins 6 .

[0027] There are protrusions 7 and thins 8 on the ribs 6 . The rim of the anti-debris filter is installed in the protrusion 7

[0028] 9. Thin part 8 in contact with the dike between the fuel element bundle support grid 10 pouring holes.

[0029] The top thin part of rib 6 can be made into tooth 11 shape, and the top is flat.

[0030] The tail end works as follows.

[0031] The coolant enters the tail end 1 equipped with an anti-rock debris filter 9, and the outer edge of the filter is installed in the convex part 7 of the rib 6 section, enters the diffuser 4, and freely diffuses radially along the rib 6, And close to the support grid 10 of the fuel element bundle.

[0032] Fix the...

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Abstract

A bottom nozzle of a nuclear reactor fuel assembly comprises the following, interconnected coaxially: a support element, a diffuser and a hexagonal frame with ribs of variable height which are fastened in non-adjacent corners of the hexagonal frame with an offset from the plane of symmetry of the corners in such a manner that the end of one rib abuts the lateral surface of another rib. A profile of the ribs has a step on the lateral surface of the ribs and a tapering of the upper end of the ribs, the step serves for mounting the ring of an anti-debris filter, and the tapering for support in a support grid of a bundle of fuel elements. The tapering of the ribs can be in the form of teeth with flat tips. The technical result consists in increasing the reliability of a bottom nozzle and of a fuel assembly as a whole by reducing the hydraulic resistance of the bottom nozzle and the vibration loading of the fuel elements.

Description

technical field [0001] The present invention relates to nuclear technology, namely pressurized water nuclear power reactor fuel assemblies. Background technique [0002] In order to increase the reliability of the fuel assembly and its protection against damage by debris particles during operation, an anti-debris filter is installed in the tail end of the fuel assembly, which is placed between the tail ribs of the maximum passage section of the tail end , to reduce hydraulic resistance. Typically, modern anti-debris filters consist of a filter element and a rim through which the filter is attached to the tail end. [0003] Known is the tail end of the reactor fuel assembly No. 25 (Russian Federation Patent No. 2079170, date of publication May 10, 1997), equipped with fins, the end of which is connected to the bottom of the lower support grid between the rows of fuel element holes. The plane is connected; the disadvantage is that the holes through which the coolant passes t...

Claims

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Application Information

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IPC IPC(8): G21C3/32
CPCY02E30/30G21C3/3206G21C3/3305
Inventor R·S·伊万诺夫M·A·舒斯托夫A·A·埃宁D·L·波利亚科夫P·M·尤林
Owner TVEL RUSSIAN FEDERATION
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