Facility Control Room

DOE-HDBK-3010-94

Appendix B; Production Support Lab

3.1.5.8 F acility C on trol R oom

The H-7 facility does not have a designated control room. Remote alarms for the air

sampling system, fire detection and suppression, ventilation pressure, etc. are available in the

utility room, which has designated shift operators to detect an alarm at the panel or via the

remote indicator horns spaced throughout the utility room. Ventilation system controller

status readout and remote controls are available by the alarm panel as well and are logged

hourly.

3.1.5.9 E lectrical P ow er D istrib u tion

The H-7 facility is provided with split bus redundant normal power, auxiliary power from the

facility diesel, and critical indication power from uninterruptable power supplies (UPS).

Normal power is received from two separate public utilities. Utility A provides power to

one main bus via the 32 substation, while Utility B provides power to the other main bus via

the 33 substation. Automatic transfer switches will connect a given bus to the other

substation upon loss of power from one supplier.

Auxiliary power is provided to the facility by a 250-kw diesel generator located in its own

compartment in the utility area. Loss of power from both normal sources will automatically

start the diesel and commence a timing sequence that will transfer emergency busses to the

diesel once it is running at rated speed. Typical time for power restoration is on the order of

10 seconds. Upon restoration of power, the ventilation fans will automatically restart in the

appropriate sequence.

There are two separate UPS in the H-7 facility. The first is dedicated to the criticality alarm

systems and provides operational power for up to 3 hours. The second UPS provides power

to the air sampling system and the ventilation readout panel for approximately 1.5 hours.

The building grounding system serves two functions. As the building electrical ground, it

offers a path to ground for electrical faults, providing additional protection along with

breakers and fuse blocks and allowing "bleedoff" of static electrical charges. Its second

function is to provide a "bleedoff" path to ground in the event lightening strikes the building.

3.1.5.10 Instru m en t A ir

Instrument air is generated by a small compressor unit in the utility room. It provides air for

a variety of small users, the most significant being the automatically controlled dampers on

the ventilation system. These units fail in their current position upon loss of instrument air.

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