Situations Requiring Independent Verification

DOE-STD-1036-93

positioned. In this case, the vent or drain valve may not require

independent verification.

C Mispositioning the component would be known immediately to an

operator (i.e., a reliable indicator of component position or an alarm

would alert an operator if the component position is not correct).

The presence of position indicating lights for a valve is not considered

sufficient justification for excluding the valve from independent

verification requirements. However, the lights may be used along

with other process parameters to verify the valve position.

C Significant exposure to radiation or hazardous material would be

received by the person(s) performing the independent verification. In

this case, an alternative method for verification should be found, such

as observing process parameters or reliable remote indication.

Any components exempted from independent verification requirements

through the criteria listed above should be approved by the operations

supervisor.

4.2

Situations Requiring Independent Verification

Independent verification should be performed whenever there is a reasonable

chance that the proper function of any system, structure, or component identified

in Section 4.1 is jeopardized. For example: whenever components of a system are

manipulated, there is a chance that the resulting alignment is not correct; or, when

operations are performed on similar, nearby systems, there is a chance of

inadvertently manipulating a component in the wrong system. Independent

verification of these activities would prevent further undesirable consequences.