TM
5-858-7
APPENDIX A
GLOSSARY
Accomplishes continuous or a periodic trans-
Air Entrainment System:
fer of air (gas) between the atmosphere
and the facility; abbreviated AES.
Prevents entry of airblast overpressure into
Blast Valve:
hardened facilities.
Combined transattack and postattack time
Endurance:
frames in which the facility must fulfill its
functions.
Equipment attached directly to its supports
Hard Mounted:
without the use of shock isolation.
A medium used to absorb the waste heat re-
Heat Sink:
j e c t e d by power generation or air-
conditioning systems. Ice or water in cav-
ities is generally used for hardened
systems.
F a c i l i t y hardened to hundreds of psi
Moderately Hardened Fa-
overpressure.
cility:
Facility hardened to tens of psi overpressure.
Nominally Hardened Facili-
ty:
The timeframe beginning after the last burst.
Postattack:
The time frame prior to first burst or to
Preattack:
button-up.
Percent of time during a given preattack peri-
Preattack
Availability:
od (or, alternatively, the probability) that
the component is in a fully operable or
committable state at the start of the at-
tack or button-up, when the attack occurs
at an unknown (random) point in time.
Primary mission of the system to which the
Prime Mission:
facility is a subsidiary element.
Displacement envelope of a shock-isolated
Rattlespace:
equipment or structure.
Facility hardened to thousands (and greater)
Superhard
Facility:
of psi overpressure.
T h e probability that a facility/subsys-
Survivability:
tem/component failure-mode will physi-
cally survive a nuclear-weapon 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.
UPS:
Uninterruptible power supply.
A-1
Previous Page
