What is criticality safety index?

Criticality Safety Index (CSI) means the dimensionless number (rounded to the next tenth) assigned and placed on the label of a fissile material package, to designate the degree of control of the accumulation of packages, overpacks or cargo containers containing fissile material during transport. Traditional criticality analyses assume that the fissile material is in its most reactive state, which is usually at its maximum enrichment, without irradiation. A nuclear criticality accident is caused by operations involving fissile material and result in a sudden and potentially lethal release of radiation. Based on the results of the criticality safety analysis presented in Chapter 6 of the SARP, the staff of the PCP of the DOE have confirmed, based on the procedure in 10 CFR 71.59 (b), that the Criticality Safety Index (CSI) is one (1.0).

Criticality Safety Index (CSI) means the dimensionless number (rounded to the next tenth) assigned and placed on the label of a fissile material package, to designate the degree of control of the accumulation of packages, overpacks or cargo containers containing fissile material during transport or carrying. Criticality Safety Index (CSI): Dimensionless number (rounded to the next tenth) assigned and placed on the label of a fissile material package, to designate the degree of control of the accumulation of packages, overpacks or cargo containers containing fissile material during transport. D) The sum of the safety criticality indices (CSI) for all Class 7 (radioactive) fissile material packages and overpacks on board a ship may not exceed the limits specified in Table IIIB of this section. These controls, whether passive (physical), active (mechanical), or administrative (human), are implemented by inherently safe or fault-tolerant plant designs, or, if such designs are not feasible, by administrative controls such as operating procedures, work instructions, and other means to minimize possibility of significant process changes that could lead to a nuclear criticality accident.

Criticality Safety Index (CSI) In addition to a transport index, a criticality safety index (CSI) must be assigned to packages containing fissile material (those not excluded under § 173.45). Nuclear criticality safety is a field of nuclear engineering dedicated to the prevention of nuclear and radiation accidents resulting from an involuntary and self-sustained nuclear chain reaction. The Criticality Safety Index (CSI) means a number (rounded to the next tenth) that is used to control the accumulation of packages, overpacks, or cargo containers containing fissile material. Criticality Safety Index (CSI) means the dimensionless number (rounded to the next tenth) assigned and placed on the label of a fissile material package, to designate the degree of control of the accumulation of packages containing fissile material during transport.

Criticality Safety Index (CSI) calculation based on the value of N determined in matrix analysis. A common practice is to apply a double contingency analysis to the operation where two or more independent, concurrent and unlikely changes in process conditions must occur before a nuclear critical accident can occur. Nuclear criticality safety professionals attempt to prevent nuclear criticality accidents by analyzing normal and credible abnormal conditions in fissile material operations and designing safe arrangements for fissile material processing. However, this is only an assumption, it is important for the criticality safety professional to understand where this does not apply, such as high-temperature reactors or low-temperature cryogenic experiments.

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