Independent Verification

DOE-STD-1186-2004

compendium of good practices and describe key elements of programs that support operations

at DOE facilities. These may be applied to improve the dependability of SACs.

Two key elements of a proper conduct of operations program that can improve the dependability

of SACs are Independent Verification and Lockouts/Tagouts. Detailed guidance is provided in

DOE O 5480.19 for each of these program elements. The following discussion provides specific

guidance relative to improving the dependability of SACs.

3.2.1

Independent Verification

SACs, which require operation of components, or verification of components condition or

position, should be included in the facility's independent verification program. As such, these

verifications should be identified explicitly in facility procedures or other official documents.

DOE O 5480.19 provides the following specific guidance on Independent Verification Programs.

"Components that are critical to ensure safe and reliable operation should receive an

independent verification of their position when circumstances warrant. These

components should be identified explicitly in facility procedures or other official

documents so that unnecessary interpretation of requirements will be minimized."

Independent verifications supporting SACs should be conducted in a manner so that each

check constitutes an actual identification of the component or action, and a determination of

both its required and actual positions or condition. To be independent, the integrity of the

checks must be maintained by minimizing interaction between the personnel operating

components and those performing the independent verifications. For example, it is not always

possible to determine if an operator has completely shut or opened a valve by merely observing

the action; mistakes in component identification or requirement determination might not be

caught without both individuals reading the labels and procedures.

3.2.2

Lockouts and Tagouts

A Lockout /Tagout program as described in DOE O 5480.19 should be used to support

implementation of SACs where the SACs require that equipment, components or equipment

controls be placed in a specific position or condition during operations to support the safety

basis. Use of this program to support an SAC further ensures that the requirements of the