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Ok so reactors more complex than BWR's have their control rods held up by electromagnets, so if power fails, the rods fall into the rod assemblys and reaction is shut down, With BWR's they are forced up from the bottom. So say your fuel melts in a PWR reactor, then as the fuel melts into a puddle your control rods collapse into the mix as they are unsupported.and so continue to a degree to moderate the reaction. You would assume that the control rods in a BWR have to be held fairly rigidly to enable fuel loading, its not like you can go in and shake the control rods so that you can fit the gaps in the fuel assembly if one isnt ligned up properly.

If it works then like I think, then the more the fuel has melted, then the less moderation will occur, its like the control rods have been pulled back out of the reactor, and all of the  fuel rods have been pressed together.

If so I just don't see how this situation can ever be brought back under control.

Any idiot can face a crisis - it's day to day living that wears you out.

by ceebs (ceebs (at) eurotrib (dot) com) on Mon Mar 28th, 2011 at 10:54:14 AM EST
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