Change Control Process cont'd

DOE-STD-1120-2005/Vol. 1

sources), interaction with available energy sources, segmentation assumptions, or nature of the

process assumptions that may affect criticality safety.

Facility changes will also occur throughout a decommissioning project that are anticipated and

described within the decommissioning plan and DSA. These changes should be reviewed as part

of the work control process. However, changes which are already analyzed and approved as part

of the existing safety basis will typically not require a USQ evaluation.

Whether anticipated or not, facility changes should be subject to a real time configuration

management process. Drawings or one line diagrams, schematics, and equipment lists that

illustrate SSCs and system boundaries described in the DSA should be current at

implementation. A single authority (often the shift manager or configuration control authority)

should be designated to maintain these drawings and lists as the facility changes, or systems and

components are removed.

Proposed changes to configuration are typically evaluated as a part of the work planning process.

Requisite reviews, such as engineering, fire protection, nuclear safety, environmental, etc.

approve the change through the planning process. The configuration control authority verifies

system status prior to authorizing work, and records system changes once the work is authorized.

Affected safety management programs may periodically review the accuracy of drawings and

lists to ensure status and configurations are current as a part of their self assessment program.

The configuration control authority should serve as the single point reference for the facility's

status and condition at any given point in time. Log keeping, upkeep of status boards, and timely

documentation of changes is vital to ensuring the work remains within the evaluated scope.

2-6