PASSIVE COMPONENTS OF NPP SAFETY RELATED SYSTEMS

摘要

This paper presents a new passivecomponents with having drives: fast-responsecutoff valves; modular actuators with oppositecocking pneumatic drives and actuation springdrives; voting electromagnetic valve units forcontrol of pneumatic drives; passive initiators ofactuation; visual diagnostics . All these deviceshave been developed and tested at mock-ups. Thispaper presents also the following direct-actionpassive safety components: modular pressure-reliefsafety valves; pilot safety valves with passiveaction; check valves with remote position indicatorand after-tightening; modular inserts for limitingemergency coolant flow; vortex rectifier; criticalweld fasteners; gas-liquid valves; fast-removableseal assembly; seal spring loaders; grooves forincreasing hydraulic resistance. Replacement ofactive safety system components for passive onesimproves the general reliability NPP by 1.5 or 2orders of magnitudes.