Ok, here's another version:
http://www.doodoo.demon.co.uk/EAS-INF-ReactorSector46J.zip
This has the problematic door to the control room fixed open, but to compensate I've added a couple of barrels for cover in the control room, and also made the control area the control room zone (as mentioned above, does not now extend outside the control room doors).
I've not been able to test this version at all; the control zone may now be broken, and the BSP has changed, so odd BSP errors may occur in other parts of the map; I therefore recommend a thorough retest if you're considering using this version.
If the I version is declared fine, great. The I zip is the release version.
If, instead, the J version is declared fine, please rename it to 'EAS-INF-ReactorSector46I' and overwrite the version in the I zip, and consider that new 'I' zip the release version.
Hope that makes sense...