The government must justify why we need to buy foreign reactors when we have developed up to 700 MWe unit-size pressurised heavy water reactors, a design which can be easily extended to 900 to 1000 MWe unit size. Why can't the 'Make in India' philosophy apply to indigenous nuclear reactors, more than 18 of which have been designed, built, and being operated by Indian engineers, asks Dr A Gopalakrishnan.