Criticality Parameters for Tank Waste Evaluation
Criticality Parameters for Tank Waste Evaluation

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Published: 1996

Total Pages: 133

ISBN-13:

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A summary is provided of basic parameters used to evaluate criticality safety of high-level tank waste at the Hanford Site. Critical sizes and plutonium concentrations are based on a conservative waste model with reduced neutron absorption and optimized water. Figures were provided of sphere and slab minimum critical dimensions and plutonium critical masses. Minimum subcritical limit absorber/plutonium mass ratios are provided for selected waste components. Component contributions to subcriticality can be combined by adding the individual actual-to-minimum subcritical mass fractions. A discussion is provided of the margin of safety inherent in tank waste.

Criticality Safety Evaluation of Hanford Tank Farms Facility
Criticality Safety Evaluation of Hanford Tank Farms Facility

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Published: 2000

Total Pages: 128

ISBN-13:

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Data and calculations from previous criticality safety evaluations and analyses were used to evaluate criticality safety for the entire Tank Farms facility to support the continued waste storage mission. This criticality safety evaluation concludes that a criticality accident at the Tank Farms facility is an incredible event due to the existing form (chemistry) and distribution (neutron absorbers) of tank waste. Limits and controls for receipt of waste from other facilities and maintenance of tank waste condition are set forth to maintain the margin subcriticality in tank waste.

Criticality Safety of Project W-151, 241-AZ-101 Retrieval System Process Test
Criticality Safety of Project W-151, 241-AZ-101 Retrieval System Process Test

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Published: 1996

Total Pages: 54

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This Criticality Safety Evaluation Report (CSER) documents a review of the criticality safety implications of a process test to be performed in tank 241-AZ-101 (101-AZ). The process test will determine the effectiveness of the retrieval system for mobilization of solids and the practicality of the system for future use in the underground storage tanks at Hanford. The scope of the CSER extends only to the testing and operation of the mixer pumps and does not include the transfer of waste from the tank. Justification is provided that a nuclear criticality is extremely unlikely, if not impossible, in this tank.