Append to the rule “Institutions” the text:

The Reactor: When a player influences the Reactor, they gain 5 credits. In addition, during the next cycle, they may send the Net a message containing the word SHUTDOWN, in all caps, and the name of an Institutions which will be ignored for the rule “Cycle Resolution” that Cycle. The same Institution may not be ignored for consecutive Cycles; any message which would cause this to occur is ignored entirely. At the end of each Cycle, the Net is encouraged to post the name of this institution to the Blog.