Technology "nuclear safety" acronyms and abbreviations

AOO: anticipated operational occurrence 
ATWS: anticipated transient without scram 
BDBA: Beyond design basis accident 
BE: best estimate 
BEPU: Best Estimate Plus Uncertainties 
BOP: Balance of Plant 
BWR: Boiling Water Reactor 
CDF: core damage frequency 
CFD: Computational Fluid Dynamics 
DAC: Distance Amplitude Curve 
DBA: design basis accident 
DNBR: Departure from Nucleate Boiling Ratio 
ECCS: Emergency Core Cooling System 
FPRF: Fission Product Release Frequency 
IGSCC: Intergranular Stress Corrosion Cracking 
IOF: Incredibility of Failure 
LBLOCA: Large Break Loss of Coolant Accident 
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 Acceptance 
PCR: Probability of Correct Rejection 
PDI: Performance Demonstration Initiative 
PIRT: phenomena identification and ranking table 
PISC: Program for Inspection of Steel Components 
POF: probability of failure 
PRA: Probabilistic Risk Assessment 
PSA: probabilistic safety analysis 
PTS: pressurized thermal shock 
PWR: pressurized water reactor 
RI-ISI: Risk Informed In-Service Inspection 
RPV: reactor pressure vessel 
SA: Safety Authority 
SAR: Safety Analysis Report 
SG: steam generator 
SSC: Systems, Structures and Components 
UT: Ultrasonic Testing