RELAP5/MOD3.3 Analysis of the Loss of External Power Event with Safety Injection Actuation

Table 1

Main sequence of events [11].

Event	Time (hh:mm:ss)
Loss of offsite load	10:27
Turbine overspeed protection started (closure of turbine governor valves with steam dump valve opening)	10:27:0
Alarm ROD BANK LO-LO LIMIT	10:28:18
Safety injection signal	10:29:02
“Unusual event” was declared	10:55
Diesel generator number 1 (2) stopped	11:20 (11:34)
Reactor coolant pump number 1 restarted	11:55
Plant transited to a “hot standby” mode, the termination of “unusual event” was declared	12:15

from measured data; LO: low; LO-LO is also called LO-2.