Purpose of DOE-STD-3009

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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