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The electrical test commenced. The main turbine feed valve was shut off, stopping the energy flow to the generator. In order to accurately measure the electricity still being generated, the heat ducts from the reactor needed to be closed off; as the temperature rose, the coolants gradually formed steam bubbles. Fatally, this also increased the level of reactivity. In contrast to the light-water reactors operating in the West, where the coolant also acts as the moderator, the type of reactor that was used in Chernobyl has a positive steam-bubble coefficient (void coefficient) when power levels are low.
The growing neutron flow meant that the neutron toxins in the core were being broken down very rapidly; further increasing reactivity and reactor output, thus heating up the coolant further. The nuclear chain reaction was spiralling out of control. |
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International
Fallout
