Removing Equipment from Service

DOE-STD-1036-93

This is not meant to imply that every operation in the facility should be

independently verified. The consequences of alignment errors in certain equipment

systems (those not meeting the criteria of Section 4.1) may not justify the

expenditure of resources and effort involved in independent verification. Facilities

should evaluate their operations to determine when independent verification should

be performed, then document the determinations in appropriate guidelines or

procedures. The following subsections discuss four specific situations when

independent verification should be performed on the systems, structures, and

components designated in Section 4.1.

4.2.1

Removing Equipment from Service

When nuclear safety, ES&H, or mission critical equipment is removed

from service, the critical or safety functions the equipment had performed

must often be transferred to other equipment or systems remaining in

service. Independent verification should be performed to ensure that the

critical or safety function is not inadvertently disabled. For example,

consider a safety system containing two redundant pumps that discharge

into a common header. One of the pumps must be removed from service

for maintenance in accordance with lockout/tagout procedures.

C Independent verification should be performed to ensure that the

remaining pump is properly aligned for service and has not been

inadvertently isolated.

C Independent verification should always be performed after installation

of a lockout/tagout to ensure that adequate protection for workers is

provided, as described in DOE Order 5480.19, Chapter IX,

"Lockouts and Tagouts," and in DOE-STD-1030-96, Guide to Good

Practices for Lockouts and Tagouts.