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DNFSB spots possible bottleneck in Hanford’s waste vitrification
Workers change out spent 27,000-pound TSCR filter columns and place them on a nearby storage pad during a planned outage in 2023. (Photo: DOE)
While the Department of Energy recently celebrated the beginning of hot commissioning of the Hanford Site’s Waste Treatment and Immobilization Plant (WTP), which has begun immobilizing the site’s radioactive tank waste in glass through vitrification, the Defense Nuclear Facilities Safety Board has reported a possible bottleneck in waste processing. According to the DNFSB, unless current systems run efficiently, the issue could result in the interruption of operations at the WTP’s Low-Activity Waste Facility, where waste vitrification takes place.
During operations, the LAW Facility will process an average of 5,300 gallons of tank waste per day, according to Bechtel, the contractor leading design, construction, and commissioning of the WTP. That waste is piped to the facility after being treated by Hanford’s Tanks Side Cesium Removal (TSCR) system, which filters undissolved solid material and removes cesium from liquid waste.
According to a November 7 activity report by the DNFSB, the TSCR system may not be able to produce waste feed fast enough to keep up with the LAW Facility’s vitrification rate.
G. L. Wire, J. L. Straalsund
Nuclear Technology | Volume 30 | Number 1 | July 1976 | Pages 71-76
Technical Paper | Material | doi.org/10.13182/NT76-A31625
Articles are hosted by Taylor and Francis Online.
A simple yet powerful method is developed to calculate steady-state creep rates in a nonvolume conservative plastic deformation that is linear in the applied stress. The method is applicable to complex stress distributions that exist in many nuclear reactor core components. Application of the method leads immediately to the steady-state creep rates for bending in plane stress and plane strain for a swelling rate that depends on position only through variation in the hydrostatic stress. The bending rate in plane strain can be significantly lower than the corresponding rate in plane stress. The method accommodates arbitrarily spatially varying stress-free swelling rates with only minor generalization. For example, the steady-state stress distribution induced by non-uniform swelling through a tube wall is obtained simply by application of standard formulas for thermal stresses in this geometry.