I am aware of the article and the history of how our SSN was converted into an SSBN.
That is why Arihant carries space for only 4 missiles.
However the news of Russian help in developing the Reactor is total fabrication and lies.
The Entire Arihant PW Reactor was designed and built totally in India by BARC.
V.K. Mehra gave leadership to the reactor development programme
H.S. Kamat was in charge of fuel development,
B.K. Bera, A.K. Suri and R.P. Singh played important roles on the fuel side.
The contribution of G.P. Srivastava, M. Mahapatra and R.K. Patil was formidable in control and instrumentation.
R.S. Yadav dealt with the design and manufacture of one of the most important components, the reactor pressure vessel.
C.G. Utge was responsible for the development of high-pressure, high-temperature equipment.
IT would be a gross disservice to the Nation aon to these scients if you were to credit the reactor to Russia.
Russian help was to provide us with Nuclear grade Uranium to fuel the Ractor.
Read more here,
Critical feat | Frontline