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| DOE-DP-STD-3016-99
Structures, Systems, and Components (SSCs). Structures, systems, components, tooling, or equipment
whose preventive or mitigative function is a major contributor to ensuring safe nuclear explosive operations
(e.g., prevention of uncontrolled material releases) and/or worker safety, as determined from HA [adapted
from DOE-STD-3009-94].
As a general rule of thumb, SSC designations are limited to those structures, systems, tooling, equipment,
or components whose failure is estimated to result in ND, HED/D, fire resulting in fissile material
dispersal, acute worker fatality or serious injuries to workers, or significant adverse consequences to the
public or the environment. The term serious injuries, as used in this definition, refers to immediately life-
threatening or permanently disabling injuries (e.g., loss of an eye, loss of a limb) from other than standard
industrial hazards. It specifically excludes potential latent effects (e.g., potential carcinogenic effects of
radiological exposure or uptake) [adapted from DOE-STD-3009-94]. Note: SSCs as used in this
technical standard does not distinguish between "safety-class" and "safety-significant" as used in DOE
Order 5480.23 and DOE-STD-3009-94.
Technical Safety Requirements (TSRs). Those requirements that define the conditions, the safe
boundaries, and the management or administrative controls necessary to ensure the safe operation of a
nuclear facility and to reduce the potential risk to the public and facility workers from uncontrolled releases
of radioactive materials or from radiation exposures due to inadvertent criticality. TSRs consist of safety
limits, operating limits, surveillance requirements, administrative controls, use and application instructions,
and the bases thereof. TSRs were formerly known as "operational safety requirements" for nonreactor
nuclear facilities and "technical specifications" for reactor facilities [DOE O 5480.22].
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