CN-121983360-A - Pressure vessel for testing bar bundle and bar bundle testing device

CN121983360ACN 121983360 ACN121983360 ACN 121983360ACN-121983360-A

Abstract

The invention provides a pressure vessel for a bar bundle test and a bar bundle test device. The rod bundle test pressure container comprises a pressure shell, a square flow passage, a compartment and a compartment, wherein the pressure shell is internally provided with a pressure cavity, the square flow passage is positioned in the pressure cavity, the square flow passage extends along a first direction, the cavity in the square flow passage is used for placing a test rod bundle, the periphery of the cross section of the square flow passage is rectangular, the length direction of the compartment is the first direction, the compartment is arranged in the pressure cavity and is positioned between the pressure shell and the square flow passage in the inner and outer directions, the compartment is abutted with the wall surface of the pressure cavity and the outer surface of the square flow passage, the compartment is provided with a pressure cavity and a first inlet communicated with the pressure cavity, and steam can be introduced into the pressure cavity from the first inlet. The bundle test pressure vessel according to the present invention has the advantage of reducing medium leakage and reducing heat loss in order to meet test requirements.

Inventors

FAN PUCHENG
YANG FUMING
LI HUIHUI
FEI LIKAI
YUAN HAOWEI
Fan guanhua

Assignees

国家电投集团科学技术研究院有限公司
国电投科技孵化有限公司

Dates

Publication Date: 20260505
Application Date: 20241025

Claims (10)

1. A bundle test pressure vessel, comprising: a pressure shell, wherein the inner surface of the pressure shell defines a pressure cavity, the pressure shell and the pressure cavity extend along a first direction, and the outer peripheral outline of the cross section of the pressure cavity is circular; The square flow channel is positioned in the pressure cavity, extends along the first direction, is used for placing a test bar bundle, and has a rectangular outer peripheral outline of the cross section; The length direction of the compartment is the first direction, the compartment is arranged in the pressure cavity, the compartment is positioned between the pressure shell and the square flow channel in the inner and outer directions, the compartment is abutted to the wall surface of the pressure cavity and the outer surface of the square flow channel, the compartment is provided with a pressure-bearing cavity and a first inlet communicated with the pressure-bearing cavity, and steam can be introduced into the pressure-bearing cavity from the first inlet.
2. The bundle testing pressure vessel of claim 1, wherein the number of compartments is a plurality, the plurality of compartments being disposed in the pressure chamber in sequence along the first direction.
3. The pressure vessel according to claim 2, wherein a measuring element is provided in the pressure chamber, a part of the measuring element extending into the square flow channel, and another part of the measuring element being located outside the square flow channel and between the two compartments in the first direction.
4. The bundle test pressure container according to claim 2, wherein the sub-compartments are made of a metallic material, each of the compartments having a condensate drain in communication with the pressure-containing chamber.
5. The pressure vessel for testing a bundle of rods according to any one of claims 1 to 4, wherein the compartments are annular and the compartments are arranged around the square flow channel.
6. The bundle tested pressure vessel according to claim 5, wherein the cross section of the compartment has a rectangular inner peripheral contour and the cross section of the compartment has a circular outer peripheral contour.
7. The bundle test pressure container according to claim 6, wherein the compartment includes a plurality of sub-compartments circumferentially surrounding a circumferential side of the square flow passage so as to form the compartment, a length direction of each of the sub-compartments being the first direction, each of the sub-compartments being located between the pressure shell and the square flow passage in an inner-outer direction, each of the sub-compartments being abutted with a wall surface of the pressure chamber and an outer surface of the square flow passage, each of the sub-compartments having a sub-pressure chamber and a first sub-inlet communicating with the sub-pressure chamber.
8. The bundle test pressure vessel according to claim 7, wherein the outer surface of each sub-capsule includes a first surface and a second surface, the first surface being planar and conforming to one outer side of the square flow channel, the second surface being a cambered surface conforming to a wall of the pressure chamber, the second surface conforming to a wall of the pressure chamber.
9. The bundle testing pressure vessel according to claim 8, wherein, The compartment comprises four sub-compartments; each sub-cabin body comprises a condensed water sub-drainage port, and the condensed water sub-drainage ports and the first sub-inlets are respectively arranged on the end surfaces of the two ends of the sub-cabin body in the length direction; The outer surface of each sub-cabin body further comprises a third surface, the first surface, the second surface and the third surface are sequentially connected in the circumferential direction of the sub-cabin body, the first surface is perpendicular to the third surface, the distance between the first surface and the second surface is increased and then reduced in the circumferential direction, and the first surface of one of two adjacent sub-cabin bodies in the circumferential direction is attached to the third surface of the other sub-cabin body; In the width direction of the first surface, the size of the first surface is larger than the size of the outer side face of the square flow channel attached to the first surface, and the third surface is coplanar with one outer side face of the square flow channel.
10. A rod bundle testing device, characterized by comprising a rod bundle testing pressure vessel according to any of claims 1-9.

Description

Pressure vessel for testing bar bundle and bar bundle testing device Technical Field The invention relates to the technical field of bar testing, in particular to a bar testing pressure container and a bar testing device. Background In the development process of an advanced pressurized water reactor fuel assembly, a series of rod bundle tests, such as a critical heat flux density test, a thermal diffusion coefficient measurement test, a rod bundle durability test, a pressure drop measurement test and the like, are often required to be carried out, so that input is provided for the design development of the fuel assembly or verification is carried out. Through the rod bundle test, the performance and the safety of the rod bundle under the extreme conditions can be verified, and the normal operation of the rod bundle under the extreme working conditions such as high temperature, high pressure and the like can be ensured, so that the safe operation of the nuclear reactor is ensured. In the related art, when a high-temperature high-pressure rod bundle test is performed, a rod bundle with a certain scale is generally placed in a square flow channel, so that a certain proportion of flow area is formed with a prototype fuel assembly. Square flow channels are difficult to withstand high pressures, so square flow channels are typically installed in cylindrical pressure vessels that are capable of withstanding high temperatures and pressures. Therefore, an extra-flow channel space is formed between the square flow channel and the pressure vessel, and due to the existence of the extra-flow channel space, all media (such as water and steam) which flow into the square flow channel in the test process can flow into the extra-flow channel space to generate leakage flow, so that the heat exchange of the reactor core, the measurement of the pressure drop of the rod bundles and the like under normal operation and accident working conditions are affected. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, embodiments of the present invention provide a bundle test pressure vessel and a bundle test device. A bundle test pressure vessel according to an embodiment of the present invention includes: a pressure shell, wherein the inner surface of the pressure shell defines a pressure cavity, the pressure shell and the pressure cavity extend along a first direction, and the outer peripheral outline of the cross section of the pressure cavity is circular; The square flow channel is positioned in the pressure cavity, extends along the first direction, is used for placing a test bar bundle, and has a rectangular outer peripheral outline of the cross section; The length direction of the compartment is the first direction, the compartment is arranged in the pressure cavity, the compartment is positioned between the pressure shell and the square flow channel in the inner and outer directions, the compartment is abutted to the wall surface of the pressure cavity and the outer surface of the square flow channel, the compartment is provided with a pressure-bearing cavity and a first inlet communicated with the pressure-bearing cavity, and steam can be introduced into the pressure-bearing cavity from the first inlet. The bar bundle test pressure vessel according to the embodiment of the invention has the advantages of reducing medium leakage and reducing heat loss so as to meet test requirements. In some embodiments, the plurality of compartments is provided in sequence along the first direction within the pressure chamber. In some embodiments, a measuring element is disposed in the pressure chamber, a portion of the measuring element extending into the square flow passage, and another portion of the measuring element being located outside the square flow passage and between the two compartments in the first direction. In some embodiments, the sub-compartments are made of a metallic material, and each compartment has a condensate drain in communication with the pressure chamber. In some embodiments, the compartment is annular, and the compartment is disposed around the circumference of the square flow channel. In some embodiments, the cross-section of the compartment has a rectangular inner peripheral profile and the cross-section of the compartment has a circular outer peripheral profile. In some embodiments, the compartment comprises a plurality of sub-compartments, the plurality of sub-compartments circumferentially surround the circumference of the square flow passage so as to form the compartment, the length direction of each sub-compartment is the first direction, each sub-compartment is located between the pressure shell and the square flow passage in the inner and outer directions, each sub-compartment is abutted with the wall surface of the pressure cavity and the outer surface of the square flow passage, and each sub-compartment is provid