 This Homogeneous Reactor Experiment ( HRE ) was affectionately dubbed " Alvin 's 3P reactor " because it required a pot , a pipe , and a pump . The HRE went into operation in 1950 and , at the criticality party , Weinberg brought the appropriate spirits : " When piles go critical in Chicago , we celebrate with wine . When piles go critical in Tennessee , we celebrate with Jack Daniel 's . " The HRE operated for 105 days before it was closed down . Despite its leaks and corrosion , valuable information was gained from its operation and it proved a simple and safe reactor to control . During the time the HRE was online , Senators John F. Kennedy and Albert Gore , Sr. visited ORNL and were hosted by Weinberg . 
