Type of Concrete keff Uncertainty ORCONCRETE 0.9856 0.0029 RFCONCRETE 0.9815 0.0031 REG-CONCRETE 0.9835 0.0026 MGCONCRETE 0.9835 0.0031 The type of concrete that resulted in the highest keff was the concrete. Therefore it will be the one used for modeling. Parametric Study 2: Effect of Wall Presence of Canister This parametric study determines the effect of modeling the canister with and without walls. The canister is modeled without walls with a 7-inch diameter and a ratio of 0.92. The canister with walls adds a stainless steel-304 wall thickness of 1/16-inch. Both models surround the canister with 1-inch of water for simulation of hands. The canister contains 4 kg of Pu-239 and is polyethylene (CH2) by 65% volume with the remainder of the volume filled with air. The keff for each scenario is as follows. keff Uncertainty With Canister Wall 0.6361 0.0029 Without Canister Wall 0.6419 0.0029 Effect of Canister Wall 0.0058 - The effect of the canister walls is approximately a 0.6% decrease in keff. The canister walls can thus be ignored and have a conservative keff. Parametric Study 3: Most Reactive Placement of Canister This parametric study determines the most conservative location to model the canister that gives the highest keff. The canister is modeled containing 4 kg 65% polyethylene (CH2) by volume, and the remainder of the volume filled by air. The canister is modeled with a 7-inch diameter and a height–to-diameter ratio of 0.92 and is surrounded by 1-inch water to simulate hands. The canister will be modeled in three positions. A corner surrounded by 12-inch concrete walls and floors. 2. A corner against a 12-inch concrete wall and floor and against a 3/16-inch stainless steel-304 wall representing a cabinet 3. A corner against a 3/8-inch stainless steel-304 sheet with a 1/16-inch layer of lead to represent the glovebox and a 12-inch concrete wall. This model applies a conservative location of the glovebox being against a wall.
Type of Concrete keff Uncertainty ORCONCRETE 0.9856 0.0029 RFCONCRETE 0.9815 0.0031 REG-CONCRETE 0.9835 0.0026 MGCONCRETE 0.9835 0.0031 The type of concrete that resulted in the highest keff was the concrete. Therefore it will be the one used for modeling. Parametric Study 2: Effect of Wall Presence of Canister This parametric study determines the effect of modeling the canister with and without walls. The canister is modeled without walls with a 7-inch diameter and a ratio of 0.92. The canister with walls adds a stainless steel-304 wall thickness of 1/16-inch. Both models surround the canister with 1-inch of water for simulation of hands. The canister contains 4 kg of Pu-239 and is polyethylene (CH2) by 65% volume with the remainder of the volume filled with air. The keff for each scenario is as follows. keff Uncertainty With Canister Wall 0.6361 0.0029 Without Canister Wall 0.6419 0.0029 Effect of Canister Wall 0.0058 - The effect of the canister walls is approximately a 0.6% decrease in keff. The canister walls can thus be ignored and have a conservative keff. Parametric Study 3: Most Reactive Placement of Canister This parametric study determines the most conservative location to model the canister that gives the highest keff. The canister is modeled containing 4 kg 65% polyethylene (CH2) by volume, and the remainder of the volume filled by air. The canister is modeled with a 7-inch diameter and a height–to-diameter ratio of 0.92 and is surrounded by 1-inch water to simulate hands. The canister will be modeled in three positions. A corner surrounded by 12-inch concrete walls and floors. 2. A corner against a 12-inch concrete wall and floor and against a 3/16-inch stainless steel-304 wall representing a cabinet 3. A corner against a 3/8-inch stainless steel-304 sheet with a 1/16-inch layer of lead to represent the glovebox and a 12-inch concrete wall. This model applies a conservative location of the glovebox being against a wall.
ExampleCSE%202018.docx