FIELD: safety system; nuclear technology.
SUBSTANCE: invention relates to passive safety systems of nuclear reactor. System of actuation and input of absorber and/or attenuator (2) neutrons in active zone is installed on nuclear fuel assembly, in which coolant circulates. System comprises capsule (10), in which there is device (11) retaining absorber (2) in inserted position, surface (24) of stopper forming means for fixing means (11) retaining, and support surface (26), forming means for release of absorber. This surface is located on control head (18). Housing (19) extends longitudinally other than capsule (10) under effect of coolant temperature increase, and moves said surfaces (24, 26) so that stopper surface moves from retention device at normal operating temperature of reactor, and support surface (26) releases absorber with threshold temperature.
EFFECT: simplified safety system.
23 cl, 10 dwg
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