Effect of Design Changes On Remote Handled Trench Waste Form Release Calculations

Bacon, Diana H. ; McGrail, B. Peter

Pacific Northwest National Laboratory (U.S.)

关键词: Corrosion;    Waste Forms;    Wastes;    Glass;    Design;   

DOI  :  10.2172/15001686
RP-ID  :  PNNL-13947
RP-ID  :  AC05-76RL01830
RP-ID  :  15001686

美国|英语

来源: UNT Digital Library

【 摘 要 】

A set of reactive chemical transport calculations was conducted with the Subsurface Transport Over Reactive Multi-phases (STORM) code to evaluate the long-term performance of a representative low-activity waste glass in a shallow subsurface disposal system located on the Hanford Site. One-dimensional simulations were conducted out to times of 20,000 yr. The simulations predict a lower release rate for the new trench design (0.605 ppm/yr) than for the old trench design (0.726 ppm/yr). Because the glass corrosion rate is significantly higher at the backfill/glass interfaces, having one less interface with the 3-layer design offsets the effect of the slightly higher pH relative to the 4-layer design. The differences between the old and new trench designs were much less significant than differences due to differences in recharge rate.