LERF: Large Early Release Frequency
PWR: pressurized water reactor
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
CHF: critical heat flux
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
ISI: in-service inspection
LBLOCA: Large Break Loss of Coolant Accident
LOCA: Loss of Coolant Accident
LPHSW: Last Pass Heat Sink Weld
NDE: Non-destructive Examination
NPP: Nuclear Power Plant
NPTU: Nuclear Prototype Training Unit
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
POD: Probability of Detection
POF: probability of failure
PRA: Probabilistic Risk Assessment
PSA: probabilistic safety analysis
PTS: pressurized thermal shock
RI-ISI: Risk Informed In-Service Inspection
RPV: reactor pressure vessel
SA: Safety Authority