Exactly as the title says, if a reactor chamber is in a different chunk than the adjacent reactor core, it will sometimes break when the chunks are loaded/unloaded.
[IC2 v1.97] Reactor chambers in a different chunk than the reactor core sometimes break.
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- Official Post
 
Exactly as the title says, if a reactor chamber is in a different chunk than the adjacent reactor core, it will sometimes break when the chunks are loaded/unloaded.
Happens sometimes even with normal/Redstone-Torches in SMP!!! And its never advised, to put a Reactor ontop of Chunkboundaries. But its a valid Bug.
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We do a regular TE check, getBlockTileEntity might not force the chunk to load...
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- Official Post
 
Wasn't that fixed in 1.3 (redstone stuff breaking cause chunks were not loaded)?