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DNFSB’s Summers ends board tenure, extending agency’s loss of quorum
Lee
Summers
The Defense Nuclear Facilities Safety Board, the independent agency responsible for ensuring that Department of Energy facilities are protective of public health and safety, announced that the board’s acting chairman, Thomas Summers, has concluded his service with the agency, having completed his second term as a board member on October 18.
Summers’ departure leaves Patricia Lee, who joined the DNFSB after being confirmed by the Senate in July 2024, as the board’s only remaining member and acting chair. Lee’s DNFSB board term ends in October 2027.
T. Sampat Sridhar, Ahmad G. Solomah
Nuclear Technology | Volume 85 | Number 1 | April 1989 | Pages 89-97
Technical Paper | Radioactive Waste Management | doi.org/10.13182/NT89-A34230
Articles are hosted by Taylor and Francis Online.
A process has been developed to immobilize the uranium-rich high-level radioactive waste generated from the reprocessing of CANDU spent fuel using the amine process. The calcination technology developed in the Process Development Section at the Whiteshell Nuclear Research Establishment has been used to demonstrate this process. Simulated liquid waste and SYN-ROC additives were denitrated thermochemically in a continuous operation using the Whiteshell Roto-Spray Calciner. Technically dense (≥95% theoretical density) samples of SYNROC-FA crystalline ceramic waste form containing ∼50 wt% simulated amine process waste were prepared by pressureless sintering at 1250°C under reducing atmosphere (N2-5 vol% H2) conditions. X-ray diffraction and grain microanalyses using an electron probe microanalyzer and an energy dispersive X-ray analyzer revealed the existence of a pyrochlore-structured phase CaU(Ti3+, Ti4+)2O7, perovskite (Ca,U)(Ti3+,Ti4+)O3, barium-hollandite Ba1.14(Al3+, Ti3+)2.27Ti5.71O16, and uraninite (U,Ca,Ti)O2. Leach tests (modified MCC-1) carried out in a simulated Canadian shield groundwater at 90°C for 120 days revealed that barium was the only ion released into the leachants, with an initial leach rate of 2x 10-1 g · m-2. day-1 measured after a 3-day period. The leach rate dropped to 6 x 10-3 g.m-2.day-1 after 120 days of leaching. The concentrations of uranium and other simulated fission products in the leachants were below the detection limits of inductively coupled plasma spectrometry and atomic absorption techniques. The leach rates of uranium and titanium were estimated to be <6 x 10-5 and 3 x 10-5 g·m-2.day-1, respectively.
