Centrally Controlled Lockout/Tagout

DOE-STD-1030-96

Only designated personnel should have access to keys for keylocks that are

integral to control devices. If the worker deactivates equipment by removing

the key from the control switch, it is essential to ensure that no additional

keys are available to unauthorized personnel. Additionally, the control

switch should be tagged.

Every isolation from an energy or hazardous material source must be

verified. Specific techniques for verification should be established by facility

procedures. The initial verification should include a review of pertinent

controlled drawings or manuals, and a hands-on physical check of the

equipment. The drawings should be used to help identify the sometimes

obscure sources of power or pressure (e.g., control power, indication or

interlock circuits, sensing lines) that may be present in equipment even

though the main (and obvious) sources have been isolated. If a physical

check is not possible because of hazards in the area or an existing lockout/-

tagout, other verification, such as observation of a reliable position indicator,

is required. Periodic checks should be performed to ensure that isolating

components remain in the proper position and that locking devices remain

properly attached.

If it is necessary to unlock an isolating device or place it in a position other

than the prescribed position during maintenance, specific authorization

should be obtained and documented. Before the change is made, persons

who will perform maintenance while the deviation is in effect must clearly

understand the change in protection level and any additional restrictions

necessary to ensure safety.

4.2.2

Centrally Controlled Lockout/Tagout

In contrast to the facilities described in Section 4.2.1, other DOE facilities have

a central organization that is responsible for operation of the facility or process,

or interrelated systems that are not necessarily under a single individual's

control. The facility may contain highly complex specialized equipment, such as

a reactor or a particle accelerator, or it may contain equipment spread over a

large area, such as electrical distribution systems. In facilities like these, certain

process and specialized safety functions may be required to ensure the safety of

personnel, equipment, and the environment, even though maintenance is being

performed on other parts of the system.