235U fission product decay heat from 1 to 100,000 seconds. Final report

This report is on project 392-1. The absorbable components of the fission-product decay heat from thermal-neutron fission of 235U have been measured in the 1 to 100,000 second time range for a one-day (86,400 second) irradiation time. The systematic uncertainty of the measurement is 2.4%, with statistical uncertainties of 2% at 1 second, increasing to 4% at 100,000 seconds. The measurements were made using a nuclear calorimeter which is based on a large (4000 liter) liquid scintillator. The uranium irradiations were made in a water moderated 252Cf source with a rapid pneumatic system to transfer the irradiated sample to the scintillator