[en] The pictorial brochure describes DHRUVA reactor which is the fifth research reactor built by the Bhabha Atomic Research Reactor, Bombay. It is a 100 MWt natural uranium fuelled, heavy water moderated and cooled thermal reactor. Salient design data of the reactor building, reactor block and major reactor components are given. Salient features of the reactor core (including fuel assemblies, coolant channels, reactor vessel, calandria), heat transport system, reactor safety system, fuel handling system and radioactive waste management are described in brief. The maximal thermal neutron flux of 1.8x10¹⁴ neutrons per cm² per second will be available. Facilities provided for research are two engineering loops, a number of horizontal, radial and tangetial tubes, microprocessor controlled neutron spectrometers, a pneumatic carrier facility for short time irradiation of samples, and systems to maintain the samples at different conditions. Two engineering loops will be used for investigating performance of prototype fuel elements and materials under simulated operating conditions in a power reactor. The reactor will also produce radioisotopes of high specific activity. Major components of the reactor such as reactor vessel, fuelling machines, heat exchangers, coolant circulating pumps have been fabricated indigeneously. (M.G.B.)