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Servoindicators for the reactor control and protection system (“SUZ”) in Unit 2 control room at Chernobyl. Blue indicators are for the shortened absorbers (“USP”) that are pulled up from the bottom of the core, while all others descend from the top of the core. The channel marked “Si” was specially allocated to the neutron transmutation of silicon for the Soviet semiconductor industry.

Servoindicators for the reactor control and protection system in Unit 2 control room at Chernobyl.