1944 Sept 27-30

1944 Sept 27-30

After several hours of operation at 100 megawatts, the B Reactor pile inexplicably shuts down, then starts up again by itself the next day. Within a few days this is determined to be due to poisoning by the highly efficient neutron absorber Xenon-135, a radioactive fission product. The reactor must be modified to add extra reactivity to overcome this effect before production can begin.

Date Range: 
1944CE Sep 27th to 1944CE Sep 30th