Explanation:

 Recently, the third unit of the Kakrapar Atomic Power Project (KAPP-3) in Tapi district of Gujarat achieved its first criticality.

• It lies near city of Vyara in Gujarat.
• It consists of two 220 MW Pressurised Heavy Water Reactor and two IPHWR-700 (Indian Pressurized Heavy Water Reactor-700, a Generation III+ reactor developed from earlier 220 MW and 540 MW designs).

The KAPP-3 is:

• India’s first 700 MWe (megawatt electric) unit, and India’s biggest indigenously developed variant of the Pressurised Heavy Water Reactor (PHWR).
• Until now, the biggest reactor size of indigenous design was the 540 MWe PHWR, two of which have been deployed in Tarapur, Maharashtra.

Hence both statements are correct.

Note: Criticality refers to the normal operating condition of a reactor, in which nuclear fuel sustains a fission chain reaction. A reactor achieves criticality when each fission event releases a sufficient number of neutrons to sustain an ongoing series of reactions.