01633oam 2200481 450 991071537240332120210309174005.0(CKB)5470000002510308(OCoLC)1237759708(EXLCZ)99547000000251030820210218d1990 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierPotential failure of motor-operated butterfly valves to operate because valve seat friction was underestimatedWashington, DC :United States Nuclear Regulatory Commission, Office of Nuclear Reactor Regulation,1990.1 online resourceInformation notice ;no. 90-21"March 22, 1990."Nuclear power plantsPipingValvesButterfly valvesFrictionButterfly valvesfastFrictionfastNuclear power plantsPipingValvesfastNuclear power plantsPipingValves.Butterfly valves.Friction.Butterfly valves.Friction.Nuclear power plantsPipingValves.U.S. Nuclear Regulatory Commission.Office of Nuclear Reactor Regulation,GPOGPOOCLCOOCLCFGPOBOOK9910715372403321Potential failure of motor-operated butterfly valves to operate because valve seat friction was underestimated3295603UNINA