Assessment of the Potential for Hydrogen Generation During Grouting Operations in the R- And P-Reactor Vessels

Blended Calcium Aluminate-Calcium Sulfate Cement-Based Grout for P-Reactor Vessel in-Situ Decommissioning

“…In addition, blended calcium aluminate -calcium sulfate hemihydrate cement compositions can be formulated such that the primary cementitious phase is a stable crystalline material. 3 A less alkaline material (≤ 10.5) was desired to address a potential materials compatibility issue caused by corrosion of aluminum metal in highly alkaline environments such as that encountered in portland cement grouts [Wiersma, 2009b, Wiersma, 2010, and Serrato and Langton, 2010. Information concerning access points into the P-Reactor vessel and amount of aluminum metal in the vessel is provided elsewhere , Stefanko, 2009a, Wiersma, 2010, Bobbitt, 2010.…”

“…A bimodal particle size distribution was selected for testing in the blended calcium aluminate -calcium sulfate cement grout based on earlier work on magnesium potassium phosphate flowable fills [Stefanko, Langton and Singh, 2010]. A Class F fly ash to quartz sand (ASTM C-404 masonry sand or 1 SRNS/SDD-Engineering made the decision to fill the R-Reactor vessel with a portland cement based grout based on the amount of aluminum metal estimated to have been left in the vessel Wiersma, 2010]. 2 Water in contact with calcium aluminate cement phases has a pH ranging from 10 to 11 depending on impurities.…”