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Assembly for anuclear reactor, comprising nuclear fuel and system for triggering and inserting at least one neutron absorber and/or mitigator element

A technology for nuclear reactors and insertion systems, applied in nuclear reactors, nuclear reaction control, reactor fuel elements, etc., can solve problems such as limited reactivity and accuracy, influence of core neutron performance, etc., to achieve the optimal accuracy and trigger reliability. Effect

Inactive Publication Date: 2014-10-08
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system's reactivity and accuracy with respect to temperature surges are very limited
In addition, the device has a severe impact on the neutron performance of the core during normal operation

Method used

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  • Assembly for anuclear reactor, comprising nuclear fuel and system for triggering and inserting at least one neutron absorber and/or mitigator element
  • Assembly for anuclear reactor, comprising nuclear fuel and system for triggering and inserting at least one neutron absorber and/or mitigator element
  • Assembly for anuclear reactor, comprising nuclear fuel and system for triggering and inserting at least one neutron absorber and/or mitigator element

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Embodiment Construction

[0063] Throughout the description, "loading assembly" refers to an assembly according to the present invention comprising both nuclear fuel and absorbing elements, while "standard assembly" refers to an assembly comprising only nuclear fuel.

[0064] Furthermore, "normal operation" refers to the operation of the reactor under normal conditions, while "accident conditions" refer to the state in which the reactor requires the insertion of absorbents to slow down or even stop the reaction. For example, accident conditions can lead to increasing reactor temperatures, which can cause coolant temperatures to rise above a given temperature threshold.

[0065] Furthermore, in the following description, the component to be inserted is described as a set of elements made of neutron-absorbing material, however, the invention can also use a set of absorbing and / or mitigating elements as an insert.

[0066] Typically, a nuclear reactor includes a chamber within which a plurality of nuclear...

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Abstract

A carrier assembly for a nuclear reactor is disclosed. The carrier assembly comprises: a housing (40); a fissile area located in the bottom portion of the housing (40); a free volume located in the top portion of the housing (40); a free space (52) in the fissile area, extending along the longitudinal axis over the height of the fissile area from the end thereof located in the top portion; a sheath (54) bordering the free space (52); and a triggering and insertion system (SI). The triggering and insertion system comprises a capsule (10) having a longitudinal axis, an absorber and / or mitigator member (2) suspended in the capsule, and a triggering and insertion device (DI) designed to release the absorber member in the event of an accidental situation occurring in relation to the assembly. The capsule (10) is inserted into the sheath (54), while the triggering and insertion system is removably mounted in the carrier assembly.

Description

technical field [0001] The invention relates to a mixing assembly for a nuclear reactor comprising nuclear fuel and at least one element which is inserted in the event of overall core melting, which element may only be neutron absorbing material and / or moderator. The moderator is a material capable of forming a eutectic with a low melting point with the material forming the cladding of the nuclear fuel rods in the assembly, and the moderator prevents the formation of plugs that would prevent the venting of the molten core or core melt. [0002] This assembly is used in particular in sodium-cooled fast reactors (hereinafter referred to as SFR). Background technique [0003] In order to control the core activity of the reactor or to limit the consequences of a reactor failure, it is planned to insert elements consisting of neutron-absorbing materials into the nuclear reactor. During normal operation, these elements may be in the form of assembly rods suspended above the core....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/326G21C9/027G21C1/02G21C1/06
CPCG21C1/02G21C9/027G21C1/06Y02E30/38G21C3/326Y02E30/30G21C7/12
Inventor 丹尼斯·洛伦佐让·米歇尔·艾斯克琳居伊·迈尔赫阿兰·拉弗内
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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