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Introduction - doe-std-3009-94_cn3_3-30-060026
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Figure I-1 DSA scope and integration


DOE-STD -3009-94
benefit.
Beyond conceptual design and construction, the methodology in this Standard is
applicable to the spectrum of missions expected to occur over the lifetime of a facility
(e.g., production, shutdown/standby, decontamination and decommissioning). As the
phases of facility life change, suitable methodology is provided for use in updating an
existing DSA and in developing a new DSA if the new mission is no longer adequately
encompassed by the existing DSA (e.g., a change from production operations to
decontamination and decommissioning). This integration of the DSA with changes in
facility mission and associated updates should be controlled as part of an overall safety
management plan.
A unique element of DSA documentation is the required provisions for decontamination
and decommissioning (D&D) as discussed in Chapter 16 of this Standard. This forward
looking aspect of facility operations is independent of facility mission and is intended to
be a means of ensuring that current facility operations take into account D&D operations
that will occur in the future.
For facilities transitioning into D&D, the safety basis of the D&D operations is
documented throughout a DSA. This DSA, of which the principal emphasis is on the
D&D operations themselves, provides the necessary analysis and supporting information to
describe the facilities as they undergo shutdown, deactivation, decontamination, and
decommissioning or dismantlement. The facility consists of the physical building, its
constituent components, and the actual processes of D&D being performed. Physical
buildings and constituent components targeted for D&D are briefly described in Chapter 2,
"Facility Description." Detailed descriptions are reserved for the actual D&D processes,
which are the focus of evaluation in Chapter 3, "Ha zard and Accident Analysis," and
Chapter 4, "Safety Structures, Systems, and Components," for each stage of major
configuration change. Also included are the temporary engineering and administrative
controls used to maintain the safety basis. This description and evaluation would envelop
major configurations during the D&D operations for which the authorization basis is
sought. This is consistent with the intent of DSAs for operating facilities where all
operations conducted are not detailed in the DSA. DSAs for D&D describe in Chapter 16,
"Provisions for Decontamination and Decommissioning," assurances that the D&D
operations for which approval is being sought are effectively planned and will not result in
future, unnecessary D&D activities (e.g., inadequate labeling of characterized hazardous
material).
D S A PR E P A R A T I O N CO N C E P T U A L B A S I S A N D PR O C E S S
The safety management programmatic requirements identified in 10 CFR 830, and
illustrated in Figure I-1, form the boundaries within which the safety analysis is
performed and represent the means of assuring safe operation of the facility. Hazard
analysis and accident analysis are performed to identify specific controls and
improvements that feed back into overall safety management. Consequence and
likelihood estimates obtained from this process also form the bases for grading the level
of detail and control needed in specific programs. The result is documentation of the
safety basis that emphasizes the controls needed to maintain safe operation of a facility.
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