The decay heat in the Unit 4 spent fuel pool had the capacity to boil about 70 metric tons of water per day ( 12 gallons per minute ).
32.
For this reason, the reactor decay heat output begins at 6.5 % of the full reactor steady state fission power, once the reactor is shut down.
33.
Despite the control rods being inserted via a SCRAM mechanism, the reactor temperature rose uncontrollably due to decay heat from fission products created during normal operation, eventually reaching.
34.
After a few days of LPCI, decay heat will have sufficiently abated to the point that defueling of the reactor is able to commence with a degree of caution.
35.
There was no public safety significance to the event, since the reactor had been shut down long enough that decay heat power was below the level that required coolant flow.
36.
But if the pool were to be drained of water, the discharged fuel from the previous two refuelings would still be " fresh " enough to melt under decay heat.
37.
In events where the reactor coolant pressure boundary remains intact, the Isolation Condenser System ( ICS ) is used to remove decay heat from the reactor and transfer it outside containment.
38.
The SCRAM is a manually triggered or automatically triggered rapid insertion of all control rods into the reactor, which will take the reactor to decay heat power levels within tens of seconds.
39.
The liquid water will drain from the heat exchanger back into the GDCS pool, where it can flow back into the RPV to make up for additional water boiled by decay heat.
40.
The reactor continued to generate decay heat and, because steam was no longer being used by the turbine, heat was no longer being removed from the reactor's primary water loop.
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