Preventive Features

DOE-STD-1027-92

initiated events (e.g., floods or earthquakes). Inherent energies within the process

(e.g., reactivity, temperatures, and pressures) should also be described.

Those accident initiators inappropriate for the facility or process under consideration

should be eliminated, and the Hazard Analysis should include the rationale for doing

so. For example, if the process does not include any liquid material and the potential

for spill does not exist, this potential initiator should be eliminated at the Hazard

Analysis level, with a brief discussion of the reasons for the elimination.

4.1.1.c

Preventive Features

Hazard Analysis identifies any structure, system, or component that serves to prevent

the release of hazardous material in an accident scenario. Preventive features may

include passive barriers such as piping, material containers, material cladding,

gloveboxes, or facility structures as well as systems or components such as pressure

relief valves, monitoring systems for material concentrations with automatic actions to

stop or isolate the process, or dilution systems to control explosive or flammable

mixtures. The discussion should begin with the preventive feature closest to the

hazardous material or mixture, end with the preventive feature farthest from the

hazardous material or mixture, and include all preventive features which may

contribute to preventing the release of the hazardous chemical or radioactive material.

Mitigative Features

4.1.1.d

Hazard Analysis identifies any structure, system, or component that serves to mitigate

the consequences of a release of hazardous materials in an accident scenario.

Mitigative features may include passive barriers such as dikes, confinement systems,

or containment systems; or active systems or components such as air cleanup

systems, sump systems, dilution systems, and liquid cleanup system. The discussion

should begin with the mitigative feature closest to the point of uncontrolled release, end

with the mitigative feature farthest from the hazardous material or mixture, and include

all mitigative features which may contribute to reducing the consequences of a release

of the hazardous chemical or radioactive material to affected on-site and off-site

populations.

4.1.2

Accident Analysis

The effort expended in performing an accident analysis in the SAR is a function of

the hazard and the complexity of a particular process, and will build upon the Hazard

Analysis already performed. There are a wide variety of techniques available. A

primary objective of the graded approach to accident analysis is to select and apply

a rigorous analysis technique which provides sufficient detail to assess each

postulated accident or failure, the resulting consequences, and all means of

prevention or mitigation.