CN210091731U - Reactor core composed of movable subcritical modules - Google Patents

Reactor core composed of movable subcritical modules Download PDF

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Publication number
CN210091731U
CN210091731U CN201920587312.5U CN201920587312U CN210091731U CN 210091731 U CN210091731 U CN 210091731U CN 201920587312 U CN201920587312 U CN 201920587312U CN 210091731 U CN210091731 U CN 210091731U
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China
Prior art keywords
fuel assembly
subcritical
reactor core
core
movable
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Active
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CN201920587312.5U
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Chinese (zh)
Inventor
李志峰
蔡杰进
卓雄杰
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South China University of Technology SCUT
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South China University of Technology SCUT
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Priority to CN201920587312.5U priority Critical patent/CN210091731U/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

Abstract

The utility model discloses a reactor core of constituteing by portable subcritical module is restrainted the equipment by the mobilizable fuel assembly who is equipped with the pulley unit of a plurality of and forms, the fuel assembly is restrainted and is constituteed by a plurality of fuel assembly, the pulley unit includes the pulley of dull and stereotyped below, the pulley unit sets up the lower part of restrainting at fuel assembly. Compare with traditional fixed ground fuel assembly, the utility model discloses a reactor core of portable subcritical module can make the inside fuel assembly of pressurized-water reactor core can separate because can make the fuel assembly bundle can separate under the necessary condition for the reactor core is in subcritical state fast, consequently the utility model provides a can remove the reactor core of subcritical module and make the reactor core possess higher security.

Description

Reactor core composed of movable subcritical modules
Technical Field
The utility model relates to a nuclear engineering field, concretely relates to reactor core of constituteing by portable subcritical module.
Background
The core, also referred to as the active zone, is typically located off-center of the reactor vessel. Taking the nuclear power plant in the bay of Daya, Shenzhen, Guangdong province, China as an example, the nuclear power plant is composed of 157 fuel assemblies with completely identical geometric shapes and mechanical structures, and the core of the nuclear power plant in the bay of the Daya is 3.65 meters in height and 3.04 meters in diameter. Fuel assemblies are components that produce nuclear fission and release heat, and therefore, the formal design of fuel assemblies is an important part of the design of nuclear power plants.
However, in general, a pressurized water reactor core similar to a bay nuclear power plant is composed of fixed square components, however, if an extreme condition that all control rods are clamped and boric acid solution cannot be injected into the core occurs, the fuel components are difficult to separate and can only leave the core in a hoisting mode, so that the fuel components are not beneficial to rapid disposal in an emergency, nuclear safety accidents are inevitably caused, and great harm is caused to human beings and the environment. Therefore, there is a need for an improved fixed fuel assembly arrangement which can be moved in case of a serious accident, and the reactor can be automatically shut down when neutron leakage increases after the distance of the fuel assembly diameter increases, so that it is very advantageous for nuclear safety to design a movable fuel assembly arrangement.
Disclosure of Invention
In order to overcome the defect that the reactor core can not be stopped in time when the control rods are all clamped and the boric acid solution can not be injected into the reactor core, the utility model provides a reactor core consisting of a movable subcritical module.
The utility model discloses a following technical scheme realizes.
A reactor core composed of movable subcritical modules is formed by assembling a plurality of movable fuel assembly bundles provided with pulley units, each fuel assembly bundle is a subcritical module composed of a plurality of fuel assemblies, each pulley unit comprises a flat plate and pulleys below the flat plate, and each pulley unit is arranged at the lower part of each fuel assembly bundle.
Further, the core includes 4 bundles of fuel assemblies.
Further, the fuel assembly bundle comprises 2-8 fuel assemblies, the assembly bundle being the smallest refueling and moving unit, the assembly bundle as a whole.
Further, the fuel component is square.
Further, the pulley unit is composed of a flat plate for supporting the weight of the bundle and pulleys below the flat plate for translational sliding.
The distance between the fuel assembly bundles can be adjusted by the pulleys as needed. Under normal working conditions, the fuel assembly bundles are connected together; under the emergency condition that the reactor core cannot be stopped timely when all control rods are clamped or boric acid solution cannot be injected into the reactor core, the distance between the fuel assembly bundles is increased through the pulleys, so that the neutron leakage is increased, and the reactor core rapidly enters a subcritical state.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model provides a pair of can remove core bottom pulley gear of subcritical module has avoided the defect that traditional pressurized water reactor core can only constitute by fixed square subassembly, this novel core is owing to add bottom pulley unit, therefore the distance between the fuel assembly bundle can change, when the emergence control rod all blocks stick or the emergency that can't in time stop when boric acid solution can't pour into the core into, the pulley can make fuel assembly bundle quick travel, has increased the leakage of neutron to realize the purpose of quick stop. Therefore, compared with the traditional pressurized water reactor, the reactor core using the movable subcritical module of the utility model can ensure that the pressurized water reactor has higher intrinsic safety.
Drawings
FIG. 1 is a schematic diagram of a nuclear reactor fuel assembly bundle of the present invention;
fig. 2 is a schematic view of the pulley device of the present invention;
FIG. 3 is a schematic view of a fuel assembly bundle equipped with a pulley device in an embodiment;
FIG. 4 is a schematic view of a reactor core of the present invention;
FIG. 5 is a schematic view of the core after separation in an emergency;
wherein 1-fuel assembly bundle, 2-flat plate, 3-pulley.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
As shown in fig. 1 to 5, the present embodiment provides a core composed of movable subcritical modules, the core including four fuel assembly bundles 1 and pulley units detachably attached to lower portions of the fuel assembly bundles.
As shown in fig. 1, the fuel assembly bundle 1 is composed of 3 fuel assemblies. The bundle of modules as a minimum unit for reloading, moving, the bundle of modules as a de facto whole.
As shown in fig. 2, the pulley unit is made up of two parts, a plate 2 and a pulley 3, respectively, the plate 2 being intended to support the weight of the bundle and the pulley 3 being intended to make a translational sliding movement.
As shown in fig. 3, the fuel assembly bundle is fixed to the pulley to constitute a movable fuel assembly bundle equipped with a pulley unit.
As shown in fig. 4, under normal operating conditions, 4 fuel bundles 1 are grouped together to form a core, which may be critical.
When emergency that the reactor cannot be stopped in time when all control rods are clamped and boric acid solution cannot be injected into the reactor core occurs, the pulleys enable the fuel assembly bundles 1 to move rapidly, as shown in fig. 5, the distance between the fuel assembly bundles 1 is increased, and the increased distance causes more neutrons to leak, so that the reactor core enters a subcritical state rapidly, and the purpose of rapid reactor stop is achieved.
The above description is only an embodiment of the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention equally within the scope of the present invention.

Claims (6)

1. The reactor core composed of movable subcritical modules is characterized in that the reactor core is assembled by a plurality of movable fuel assembly bundles (1) assembled with pulley units, the fuel assembly bundles (1) are subcritical modules composed of a plurality of fuel assemblies, each pulley unit comprises a flat plate (2) and pulleys (3) below the flat plate, and the pulley units are arranged at the lower part of the fuel assembly bundles (1).
2. The core of movable subcritical modules according to claim 1, characterized in that the core comprises 2-8 bundles (1) of fuel assemblies.
3. The core of movable subcritical modules according to claim 1, characterized in that the fuel assembly bundle (1) comprises 2-8 fuel assemblies.
4. The core of claim 3 wherein said fuel planimetric is square.
5. The core, consisting of movable subcritical modules, according to claim 1 characterized in that said pulleys (3) are fixed on the flat plate (2) by welding or bolting.
6. The core consisting of removable subcritical modules according to claim 1, characterized in that the pulley unit is removably connected with the bundle of fuel assemblies (1).
CN201920587312.5U 2019-04-26 2019-04-26 Reactor core composed of movable subcritical modules Active CN210091731U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920587312.5U CN210091731U (en) 2019-04-26 2019-04-26 Reactor core composed of movable subcritical modules

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920587312.5U CN210091731U (en) 2019-04-26 2019-04-26 Reactor core composed of movable subcritical modules

Publications (1)

Publication Number Publication Date
CN210091731U true CN210091731U (en) 2020-02-18

Family

ID=69476063

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920587312.5U Active CN210091731U (en) 2019-04-26 2019-04-26 Reactor core composed of movable subcritical modules

Country Status (1)

Country Link
CN (1) CN210091731U (en)

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