An instrumented absorber experiment in the Experimental Breeder Reactor-II yielded data on the helium release of boron carbide at exposures up to 53 × 1020 neutron captures/cm3 and temperatures from 766 to 952°C. Helium release results demonstrated a high rate of helium release initially, and a much lower rate at higher burnup levels. In addition, the experiment demonstrated the effectiveness of vents in releasing gas from a plenum during irradiation.