Schematic of KLT-40S reactor and its systems (based on original figures from AO OKBM by the name of I. I. Afrikantov, Brochure on KLT-40S [39] and from Ref. [37] (in red—newly introduced safety systems): 1—passive system of containment emergency pressure decrease (condensing system); 2—active emergency cooling system through heat exchangers of loops I—III; 3—passive emergency core cooling system (hydraulic accumulators); 4—active emergency core cooling system from feedwater pumps; 5—active system for injecting liquid absorber; 6—active emergency core cooling system from feedwater pumps; 7—active emergency core cooling system through recirculation pumps; 8—system of reactor caisson filling with water; 9—containment passive emergency pressure decrease system (bubbling); 10—active emergency shutdown cooling system (through process condensers); 11—passive emergency shutdown cooling system; 12—to atmosphere.