Inside Chernobyl Nuclear Power Plant 2011, Part II: Deaerator Corridor and Unit 1 Control Room » P1020048

One of the changes to the RBMK control system that was made after the 1986 accident was the addition of a control room display of the calculated quantity known as the “operational reactivity margin” (оперативный запас реактивности or ОЗР), basically the reactivity of control rods remaining in the core. Having too few there, as happened in the Chernobyl 4 accident, can set the stage for a positive scram, among other deleterious effects. This is a chart recorder (at right) labelled “запас реактивн[ости]”, probably Unit 1’s retrofitted display for this quantity. Above it is a Nixie tube display, also probably for this quantity.

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