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|  DOE-STD-1027-92
may be omitted or reduced in the detail that would otherwise be required of Hazards
Category 1 or 2 facilities."
The four elements of accident analysis as related to Category 3 facilities are
discussed below:
Release Mechanisms
The Hazard Analysis alone should be sufficient to identify important release
mechanisms for the level of hazard present in a Class 3 facility. The focus of the
analysis is to identify unique or non-routine scenarios which could have significant
adverse effect on the workers in the facility and to demonstrate that there are sufficient
preventive or mitigative features to protect them. If complexity were considered to
warrant a higher-order technique, selection would follow the same line of reasoning
presented for Category 2 facilities.
Sequence Selection
A checklist should be used to ensure that a comprehensive set of the potential accident
conditions is qualitatively considered. An example list of the potential accident
sequences is included in Table 4.1.
Table 4.1 Example Category 3 Accident Sequences
No.
Accident Sequences
1
Equipment Fire
2
Room Fire
Room Fire Involving Radioactive or Toxic Materials
3
4
Uncontrolled Chemical Reaction
5
Chemical Exposure
Inhalation, Ingestion, or Dermal Exposure to Toxic,
Radioactive or Carcinogenic Materials
6
7
Compressed Gas Explosion
Gas Explosion (Oxygen, Acetylene, LP Gas)
8
High-intensity Laser-Light Exposure
9
Ionizing Radiation Exposure Due to ICF
Target Implosions
10
Ionizing Radiation Exposure Due to
11
Contaminated Components
12
Nonionizing Radiation Exposure
17
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