The chernobyl accident updating of insag 1

During the course of a safety system test being carried out just before a routine maintenance outage, Chernobyl 4 was destroyed as a result of a power transient on 26 April 1986.The accident at Chernobyl was the product of a lack of safety culture.The rupture of several fuel channels increased the pressure in the reactor to the extent that the 1000 t reactor support plate became detached, consequently jamming the control rods, which were only halfway down by that time.

Calculations performed after the accident showed that the ORM at was equal to eight manual control rods.As the shutdown proceeded, the reactor was operating at about half power when the electrical load dispatcher refused to allow further shutdown, as the power was needed for the grid.In accordance with the planned test programme, about an hour later the ECCS was switched off while the reactor continued to operate at half power.The slower flowrate, together with the entry to the core of slightly warmer feedwater, may have caused boiling (void formation) at the bottom of the core.This, along with xenon burnout, could have resulted in a runaway increase in power.

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