rad radial feeder radial network radial operation of a part of a network radial system radian radiant flux density radiant-flux-density radiation radiation balance meter radiation damage radiation detector Radiation Protection Advisory Team radiation thermopile radioactive radioactive aerosol contamination meter radioactive aerosol contamination monitor radioactive cemetery radioactive chain radioactive contamination radioactive decay radioactive decontamination radioactive disintegration radioactive element radioactive equilibrium radioactive fall out radioactive half-life radioactive isotope radioactive material radioactive nuclide radioactive series radioactive source radioactive standard radioactive substance radioactive waste radioactivity radioactivity standard radiochromatograph radioelement radio frequency heating radiograph radioisotope radionuclide radon content meter radwaste rail tank car rail tanker ramp insertion of reactivity rank rare gas rate rated burden rated capacity rated delivery of a pump rated discharge of a pump rated discharge of a turbine rated net head rated power rated voltage rated wind speed rate-of-flow indicator rating ratio of activity densities raw coal raw coal screen raw oil reaction channel reaction type turbine reactive energy reactive power reactive power compensation reactive-power voltage control reactivity reactivity balance reactivity coefficient reactivity deficit reactivity meter reactivity meter reactivity power coefficient reactivity worth

reactor reactor cell reactor containment reactor containment reactor control reactor coolant reactor core reactor excursion reactor lattice reactor line reactor loop reactor noise reactor oscillator reactor period reactor pressure vessel reactor safety fuse reactor Simulator reactor system reactor system reactor thermal power reactor time constant reactor vessel receiving tank receiving tank reciprocal ohm reciprocating screen recirculation recovery factor reduced crude reduced crude oil reduction in voltage reduction ratio redundancy factor reference fuel reference node reference period refinery refinery gas refining reflectance reflected global radiation reflected solar radiation reflection factor reflector reflector control reflector saving reformer reforming refuelling machine refuse regenerator Regional Nuclear Fuel Cycle Centers Regional Nuclear Fuel Cycle Centres regulating element regulating energy of a system regulating member reheater reinforcement of a system re-injection reject releasing current reliability of an item relief well remote earth remote ground remotely controlled substation renewable energy sources renewable sources of energy reprocessing re-regulating reservoir research research reactor

reserve busbar reserve energy reserve power of a system reserves reserves of mineral and fossil fuels reservoir reservoir reservoir fullness factor reservoir power station residual flow residual heat residual voltage residual voltage of an arrester resistive fault resonance neutron resonance screen resonant earthed neutral system resonant overvoltage resources of mineral and fossil fuels restricted hour tariff retention water level returned flow return point return temperature reverse combustion reversible hydroelectric set revertive signal switch revision clause revolving screen RF heating riffle rig ring closing ring opening ring operation of a part of a network ring substation rinsing rinsing water river power plant road tank car road tanker rocket fuel rocket propellant rock hound rock oil roentgen roentgenogram roentgen rays roll screen R.O.M. coal room and pillar mining room-and-pillar technique rotary breaker rotary drilling rotational control electromechanism rotor swept area royalty rubber gloves method rundown drum run-of-mine coal run-of-river power Station run-of-the-river plant röntgen röntgenogram röntgen rays