naphtha naphthene base crude naphthenic base crude naphthenic crude naphthenic crude oil naphtheno-paraffinic crude oil natural abundance natural bitumen natural circulation boiler natural convection natural energy natural flow natural gas natural gas field natural gas liquid natural gasoline natural-gasoline plant natural load of a line natural oil natural-uranium-fueled reactor natural-uranium-fuelled reactor natural uranium reactor negative electron negative reactivity negaton negatron neper net average heat rate of a unit net calorific value net gasoline net head of a hydroelectric power station net heating value net output capacity net output of a power station net output of a set net pyrradiometer net specific energy net thermal efficiency of a unit net ton network network network calculation network configuration network conversion network diagram

network losses network operational diagram network pattern network splitting network transformation neutral neutral point connection neutral point displacement voltage neutral point in a polyphase system neutrino neutron neutron absorber neutron-absorbing material neutron converter neutron current density neutron cycle neutron density neutron economy neutron energy group neutron excess neutron multiplication neutron number density newton night tariff n minute demand noble gas no-load loss nominal capacity nominal delivery of a pump nominal discharge of a pump nominal discharge of a turbine nominal generation nominal output nominal production nominal voltage non-coincident peak method non-commercial energy non-corrosive crude oil non-damage fault non-energy use non-essential auxiliary circuits non-linear resistor type arrester non-Newtonian viscosity nonownership theory non-self-restoring insulation

normal pool level normal tariff normal top water level normal water level normal year normal year nuclear accident nuclear binding energy nuclear burnup nuclear burn-up nuclear chain reaction nuclear criticality safety nuclear energy Nuclear Energy Agency Nuclear Energy Agency Nuclear Data Committee nuclear fission nuclear fuel nuclear fuel cycle Nuclear Fuel Cycle Information System nuclear fusion nuclear fusion reaction nuclear isobar nuclear isomer Nuclear Material Information System nuclear matter nuclear particle nuclear poison nuclear power nuclear power plant nuclear power station nuclear reaction nuclear reactor nuclear safety Nuclear Safety Standards Programme nuclear superheat nuclear superheating nuclear thermal power station nucleon nucleon number nucleus nuclide NUSS Programme