TM-5-855-4
Designed to resist an attack and protect the
Hardened:
prime mission materiel/personnel from
weapon effects.
Equipment attached directly to its supports
Hard Mounted:
without the use of shock isolation.
A medium used to absorb the waste heat
Heat Sink:
rejected by
power generation or air-
Ice or water in
conditioning systems.
cavities is generally used for hardened
systems.
Maintaining constant (thermostatted) air
Holding:
temperature conditions in the room.
Water Hammer.
Hydraulic Surge:
Probability that an operating asset will
Operating Reliability:
perform its function for a specified time
interval.
Atmospheric entrance (exit) detail of a duct.
Port:
The time frame beginning after the last
Postattack:
burst.
The time frame prior to first burst or to
Preattack:
button-up.
Primary mission of the system to which the
Prime Mission:
facility is a subsidiary element.
Facility subsystem that protects the prime-
Protective Subsystem:
mission materiel/personnel and other
facility subsystems from the weapon effects.
Underground cavity that approximates the
Rectangular Space:
geometry of a rectangular parallelepiped.
Approximate volume of rock affected by the
Rock Shell:
heat transfer around a rectangular space.
The probability that' a facility- subsystem/
Survivability:
component failure-mode will physically
survive an attack and retain its physical
integrity during the specified endurance
period.
The time frame between the first burst (or
Transattack:
button-up) and the last burst.
Less than perfect reliability but -not
Unreliability:
necessarily unacceptable.
Hollow metallic tube that acts as a high-pass
Waveguide:
filter to electromagnetic energy.
Glossary-2
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