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ikalugin · 06-17-19, 06:08 AM

Yes, the lower control rods are important, as the graph I showed shows the neutron fields spike at the bottom during the main control rod insertion. Unfortunately block 4 was not yet retrofitted to include bottom rods into the AZ5 command, as were other reactors, for example blocks 1 and 2 were refitted in such a way under the initiative of the operator to improve their safety. The other safety feature would be to use longer graphite tips, so that they remain in the reactor when the control rods are fully elevated.

The fuel rods are pulled up using the refueling machine, what happens is that the machine attaches a tube to the top of the channel, filling it with water and then uses an internal crane to pull the old fuel rod up and then place the new fuel rod down.

You can see the process on this 3d model in some detail.

06-17-19, 06:08 AM	#42
ikalugin Ocean Warrior Join Date: Aug 2014 Location: Moscow, Russia Posts: 3,212 Downloads: 8 Uploads: 0	Yes, the lower control rods are important, as the graph I showed shows the neutron fields spike at the bottom during the main control rod insertion. Unfortunately block 4 was not yet retrofitted to include bottom rods into the AZ5 command, as were other reactors, for example blocks 1 and 2 were refitted in such a way under the initiative of the operator to improve their safety. The other safety feature would be to use longer graphite tips, so that they remain in the reactor when the control rods are fully elevated. The fuel rods are pulled up using the refueling machine, what happens is that the machine attaches a tube to the top of the channel, filling it with water and then uses an internal crane to pull the old fuel rod up and then place the new fuel rod down. You can see the process on this 3d model in some detail. __________________ Grumpy as always. Last edited by ikalugin; 06-17-19 at 06:18 AM.