When strategic maters such as nuclear power plants are discussed, they are rarely devoid of political and strategic consideration. But as I have already explained, we consider India a potential threat/bully, what ever you want to call it, so no gov in Bangladesh would want to risk endangering the national security buy buying these tech frm India. We would only go to china, Russia, France, south Korea etc, but not India for these items.
Let me give you a simple example, you would love to buy gas from Iran, but the most cost effective route would be to build a pipeline through Pakistan, but this will never happen as then furring tensions, India runs the risk of the supply being cut. Same with us buying anything from India we risk, supply and support being with held. More over India is a net importer of uranium, and is not able to supply the fuel over the duration of the plant life.
As for importing, whether it's from India or Russia, it's still importing, just the difference is price and quality.