Abbreviation
TOCDNPP WWPR
typical optimized and computerized design of a nuclear power plant with a water-water power reactor
TTA
technical teaching aids
UH

uranium hexafluoride
USS MSNF
Unified State System for the Management of Spent Nuclear Fuel
WA OONPP
World Association of organizations operating nuclear power plants 
WCR
water-chemical regime
WWPR
water-water power reactor