Defining the Scope of CM SSCs

DOE-STD-1073-2003

Configuration Management

3.2

Defining the Scope of CM SSCs

In order to assess the impact a change will have to an activity, the contractor must first

understand the design requirements of the activity. These design requirements must be

identified and documented, and changes to them must be controlled.

However, configuration management requires resources to implement and, therefore,

should not be applied indiscriminately. Some changes, such as plumbing upgrades to a

restroom or the relocation of a storage shed for yard maintenance that do not impact

safety or mission-required SSCs may not need the more stringent controls required for

systems necessary to ensure safety. The contractor should identify and document the set

of SSCs for an activity that will be managed through the configuration management

process. This set is referred to as the CM SSCs throughout this standard. The CM SSCs

are compiled from several sets of SSCs. These sets may overlap.

The first set of SSCs that must be included in the CM SSCs for hazard category 1, 2, and

3 nuclear facilities is the set of Safety SSCs identified in the DSA as required by

10 CFR 830.204(b)(1). Safety SSCs are defined as the combination of Safety-Class

SSCs and Safety-Significant SSCs, and they include those SSCs whose preventive or

mitigative functions are considered to be major contributors to defense-in-depth and

worker safety. "Defense-in-depth" refers to the various layers of protection provided to

ensure public safety, worker safety, and protection of the environment. The safety SSCs

identified in the DSA constitute the baseline set of SSCs that must be included in the

configuration management process.

In addition, contractors should include in the set of CM SSCs the SSCs whose functions

are considered to be important to defense-in-depth or worker safety, but are not already

included in the Safety SSCs. The combination of the Safety SSCs and the other defense-

in-depth SSCs should encompass the "vital safety systems." The vital safety systems

include the safety significant systems, the safety class systems, and other systems that

perform an important defense-in-depth safety function. Additional information on vital

safety systems is available in documents responding to Defense Nuclear Facilities Board

(DNFSB) Recommendation 2000-2 and at http://www.deprep.org/vss/default.asp.

The contractor should also review the activity to determine if it is appropriate to include

other SSCs in the set of CM SSCs. Other categories of SSCs that should be considered

include the following:

Mission critical SSCs - SSCs whose failure could cause substantial interruption to

the mission of the facility or activity;

Environmental protection SSCs - SSCs that could have a significant impact on the

environment if they failed to perform their function;

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