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References - s3007cn10017
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Guidelines For Preparing Criticality Safety Evaluations at Department of Energy Non-Reactor Nuclear Facilities
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Examples of Contingency Analyses cont'd


DOE-STD-3007-93
APPENDIX C, D,... ETC.
OPTIONAL APPENDICES PROVIDING
SUPPLEMENTAL INFORMATION
Other appendices providing supplemental information may be provided at the author's discretion.
EXAMPLE # 1
Contingency analysis for a dry storage cask that is used to store irradiated
PWR or BWR fuel assemblies.
Contingency
No.
Description
Barriers
Flood Cask Interiora
1
Cask is sealed; lid is well above flood
plainb
Insert is in a noncorrosive environmentb
2
Loss of Neutron Poison from
Inserta
a. The degree of flooding or the magnitude of poison loss required to have a
criticality accident is discussed in Section 6.0.
b. Surveillance is required to ensure the integrity of this barrier. Details of
surveillance procedures are documented in Reference .
EXAMPLE # 2
Contingency analysis for a large dissolver vessel. Criticality safety margins are
maintained by controlling the mass of fissile material and the concentration of
neutron poison inside a large dissolver vessel. Inadvertent criticality can occur
by exceeding the fissile mass, dilution or improper makeup of soluble neutron
poison, or by a combination of the two.
Controlsa
Control Parameter
No.
Description
Fissile Mass (U-235)
1.
Mass Balance System # 1
2.
Mass Balance System # 2
3.
Visual Inspection
OR
Concentration of Neutron Poison
1.
Poison Monitor # 1
2.
Poison Monitor # 2
3.
Sampling
a.
A more detailed description of these controls is given in Reference __. At least two
controls are required; no further significance should be placed on the number of controls
listed in this example.
9


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