13.00 Test commences. 14.00 Emergency Core Cooling system from primary circuit. 14.05 Reactor asked to supply grid with power. Xenon poisoning increased, plant more difficult to control. 23.10 Released from grid.
Test resumes with reduction in power.
00.28 Operator omits entry of hold-power level to system. Test continues with operators removing remaining defences. 01.22 Only 6 - 8 control rods are inserted. 01.24 Plant goes supper critical. Criticality is now irreversible.