AOO - anticipated operational occurren… 
ATWS - anticipated transient without s… 
BDBA - Beyond design basis accident 
BE - best estimate 
BEPU - Best Estimate Plus Uncertaintie… 
BOP - Balance of Plant 
BWR - Boiling Water Reactor 
CDF - core damage frequency 
CFD - Computational Fluid Dynamics 
CHF - critical heat flux 
DAC - Distance Amplitude Curve 
DBA - design basis accident 
DNBR - Departure from Nucleate Boiling… 
ECCS - Emergency Core Cooling System 
FPRF - Fission Product Release Frequen… 
IGSCC - Intergranular Stress Corrosion… 
IOF - Incredibility of Failure 
ISI - in-service inspection 
LBLOCA - Large Break Loss of Coolant A… 
LERF - Large Early Release Frequency 
LOCA - Loss of Coolant Accident 
LPHSW - Last Pass Heat Sink Weld 
NDE - Non-destructive Examination 
NPP - Nuclear Power Plant 
NSSS - Nuclear Steam Supply System 
PCA - Probability of Correct Acceptanc… 
PCR - Probability of Correct Rejection 
PDI - Performance Demonstration Initia… 
PIRT - phenomena identification and ra… 
PISC - Program for Inspection of Steel…