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DEVICE FOR TRIGGERING AND INSERTING ABSORBENT AND / OR MITIGATOR ELEMENTS IN A FISSILE AREA OF A NUCLEAR REACTOR AND ASSEMBLING NUCLEAR FUEL COMPRISING SUCH A DEVICE
DEVICE FOR TRIGGERING AND INSERTING ABSORBENT AND / OR MITIGATOR ELEMENTS IN A FISSILE AREA OF A NUCLEAR REACTOR AND ASSEMBLING NUCLEAR FUEL COMPRISING SUCH A DEVICE
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机译：在核反应堆的裂变区中触发和插入吸收剂和/或缓解元素的装置，以及组装包含这种装置的核燃料的装置
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摘要
A system for triggering and inserting a neutron absorber and/or mitigator (2) in a fissile area of a nuclear reactor, intended to be mounted in a nuclear fuel assembly wherein there flows a coolant, said system comprising a capsule (10) provided with holding means (11) for securing the absorber (2) in a non-inserted position, a stop surface (24) forming means for locking the holding means (11) and a thrust surface (26) forming means for releasing the absorber, said surfaces being carried by a control head (18). A collet (19) expands longitudinally differentially with regard to the capsule (10) under the effect of an increase in the temperature of the coolant and moves said surfaces (24, 26) such that the stop surface is moved away from the holding means at the normal operating temperature of the reactor, and the thrust surface (26) releases the absorber at a threshold temperature.
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