7
POSV
– pilot-operated safety valve
PRHRS
– passive residual heat removal system (air duct)
PSA
– probabilistic safety assessment
PS
– primary seal
PTU
– protective tube unit
PWR
– pressurized water reactor
PZR
– pressurizer
RBMK
– boiling water-cooled graphite-moderated pressure-tube type reactor
RCIM
– reactor channel integrity monitoring
RCS
– refueling control system
RFCC
– repeated forced circulation circuit
RU
– reactor unit
RW
– radioactive waste
SA
– shield assembly
SAR
– shortened absorber rod
SCS
– safety control system
SDU
– screw-down unit
SE
– safety enclosure
SG
– spacer grid
SG
– steam generator
SGE
– steam generating element
SGPZR
– steam-and-gas pressurizer
SS
– safety system
SV
– safety valve
TDU
– tube and device unit
TM
– temperature monitoring
TU
–
top unit
UT
– ultrasonic testing
UVR
– advanced water reactor
VBER
– modular water energetic reactor
VPBER
– enhanced-safety water energetic reactor
VVER
– light water (water-water) energetic reactor
