Scram as the original and mostly likely accurate basis for the use of scram in the technical context. A persistent alternative explanation posits that scram is an acronym for 'safety control rod axe man', which was supposedly coined by Enrico Fermi when the world's first nuclear reactor was built under the spectator seating at the University of Chicago's Stagg Field. It could also stand for "Safety Control Rods Activation Mechanism" or "Control Rods Actuator Mechanism". Both of these are probably backronyms from the original, non-technical usage. In any reactor, a SCRAM is achieved by inserting large amounts of negative reactivity mass
McMaster Nuclear Reactor confirm that there has never been a report of any nuclear material that has been lost or stolen from McMaster's reactor". McMaster Nuclear Reactor The McMaster Nuclear Reactor (MNR) is a 5MW pool-type reactor located on the campus of McMaster University, in Hamilton, Ontario, Canada. MNR began operating in April 1959, as the first university based research reactor in the Commonwealth of Nations, and remains the highest-flux reactor in a university environment in Canada to this day. The reactor consists of two connected pools; the core can be located and operated in either one. This allows the core to be