ACRONYMS, ABBREVIATIONS, AND DEFINITIONS
 
AC alternating-current
  Advisory Group on Nuclear Event Communications 
(the) Advisory Group
   
AFS auxiliary feedwater system 
   
ANS American Nuclear Society 
   
BDBA beyond-design-basis accident
   
Bq becquerel
BWR boiling water reactor
Ci curie
cold shutdown RPV water temperature is <100°C.
(the) Committee The American Nuclear Society Special Committee on Fukushima
containment refers to the configuration of thestructure and associated systems that enclose the nuclear reactor and are the final barrier to the release of radioactive materials into the environment in the case of a severe accident; containment designs are designated Mark I (the oldest), Mark II, and Mark III (the most recent).
134Cs cesium-134
137Cs cesium-137
CST condensate storage tank
DC direct-current
DOE U.S. Department of Energy
ECCS emergency core cooling system
EDG emergency diesel generator
Gy gray; the international system unit of measure for the amount of energy deposited in any material from any form of radiation
HPCI high-pressure coolant injection 
131I iodine-131
IAEA International Atomic Energy Agency
JAEA Japan Atomic Energy Agency
JAEC Japan Atomic Energy Commission
kBq kilobecquerel
km kilometer
km2 kilometers squared
LWR light water reactor
m meter
Mark I see “containment”
Mark II see “containment”
Mark III see “containment”
MBq megabecquerel
MEXT Ministry of Education, Culture, Sports, Science and Technology–Japan
µSv microsievert; see “Sv”
mm millimeter
mR millirad; see “rad”
mrem millirem; see “rem”
mSv millisievert; see “Sv”
MWe megawatt electric
m2 meters squared
m3 cubic meters
MSIV main steam isolation valve
NEI Nuclear Energy Institute
NIRS National Institute of Radiological Sciences (Japan)
NNSA National Nuclear Security Agency (DOE)
NPP nuclear power plant
NPS nuclear power station
NRC U.S. Nuclear Regulatory Commission
NTTF Near-Term Task Force
outage Cold shutdown condition and periodic inspections and/or refueling operations are being conducted; the RPV head may be on or off.
PCV primary containment vessel
person-Sv person-sievert
(the) PI Committee Public Information Committee 
(the) Plan Nuclear Event Communications Plan 
PWR pressurized water reactor
RCIC reactor core isolation cooling 
rad radiation absorbed dose; the unit of measure for the amount of energy deposited in any material from any form of radiation; the related international system unit is the gray (Gy).
rem roentgen equivalent man; the unit of measure for the amount of energy deposited in a human body that accounts for the effect of differences in radiation types (alpha, beta, gamma, etc.) on living tissue; the related international system unit is sievert (Sv).
RHR residual heat removal
RPV reactor pressure vessel
SAMG severe accident management guideline
SBO station blackout
SFP spent-fuel pool
SRV safety and relief valve
start-up RPV head is on, reactor is critical, and primary system is being heated.
Sv sievert; the international system unit of measure for the amount of energy deposited in a human body that accounts for the effect of differences in radiation types alpha, beta, gamma, etc.) on living tissue
(the) Technical Group Technical Group on Nuclear Communications
TEPCO Tokyo Electric Power Company
TMI-2 Three Mile Island Unit 2
Unit refers to reactor(s) in NPS(s)