India Designed Reactor Unit of Rajasthan Atomic Power Project Achieves Criticality (Start of Controlled Fission Chain Reaction)

Nuclear Power Corporation of India Limited (NPCIL) has announced that, the Unit 7 of the 2 X 700 MW Rajasthan Atomic Power Project 7 & 8 (RAPP-7&8) at Rawatbhata, achieved the important milestone of Criticality (start of controlled fission chain reaction) on September 19, 2024 at 22:42 hrs, after clearance of First Approach to Criticality by the Atomic Energy Regulatory Board (AERB).

The Rajasthan Atomic Power Project (RAPP), also known as the Rajasthan Atomic Power Station (RAPS), is a significant nuclear power plant located in Rawatbhata, Rajasthan, India.

RAPP-7 is the third in the series of sixteen indigenous Pressurised Heavy Water Reactors (PHWR) of 700 MW each, being set up in India.

India Designed Unit of Rajasthan Atomic Power Project Achieves Criticality (Start of Controlled Fission Chain Reaction)

The successful achievement of Criticality of RAPP-7, after the smooth operation of the first two 700 MW PHWRs, viz. KAPS 3&4 (2X700 MW) at Kakrapar in Gujarat, demonstrates the maturity achieved by NPCIL in the design, construction and operation of the indigenous 700 MW PHWRs.

Criticality for the first time on the project timeline marks the completion of construction phase and commencement of the operation phase.

Various experiments/ tests will now be conducted before connecting it to the grid. Thereafter the power level will be raised in steps to full power, in line with the clearances of the Atomic Energy Regulatory Board (AERB).

RAPP-7&8 project is being set up at Rawatbhata in Rajasthan, where already six units with a total capacity of 1180 MW are in operation. RAPP-7 is expected to start generation this year, followed by RAPP-8 in the next year.

NPCIL presently operates 24 reactors with a total capacity of 8180 MW and has eight units (including RAPP-7) with a capacity of 6800 MW under construction. In addition, 10 more reactors with a total capacity of 7000 MW are in pre-project activities. These are expected to be completed progressively by 2031-32.

The Rajasthan Atomic Power Project (RAPP), also known as the Rajasthan Atomic Power Station (RAPS), began in 1963, with the first reactor (RAPS-1) becoming operational in 1973. The plant has expanded over the years and currently includes multiple reactors.

The plant operates several pressurized heavy water reactors (PHWRs). Units 1 and 2 are CANDU reactors, while Units 3 to 8 are Indian-designed PHWRs. The total installed capacity is 1,180 MW, with two additional reactors (Units 7 and 8) under construction, each with a capacity of 700 MW.

The International Atomic Energy Agency (IAEA) has audited the reactors at RAPS and concluded that they are among the best in the world in terms of safety.

Units 7 and 8 are expected to significantly increase the plant’s capacity.
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