President Ram Nath Kovind has said the demise of veteran scientist Dr Sekhar Basu is a huge loss to the nation.<br />'' <br />''In his message, Mr Kovind said the scientist, a former chairman of Atomic Energy Commission, was a stalwart of nuclear science research and immensely contributed to nuclear powered submarine INS Arihant.<br />'' <br />''<span style="color: #222222;">The President extended his condolences to the bereaved family and friends.</span><br />