The accident is the worst since the 2009 collapse of a power-plant chimney under construction at Bharat Aluminium Co.s Korba project killing 45 people.
The NTPC Management had set up an enquiry to investigate the reasons for the accident on November 1, when a boiler at 500 MW Unit-6 blasted and caused injuries to around 80 people.
"Around 80 people were affected due to this accident. 32 succumbed to injuries and 48 are under treatment," NTPC Chairman and Managing Director Gurdeep Singh told reporters here.
Asked about the prima facie reasons for the blast, Singh said: "Enquiry will reveal whether it was human error, violation of safety norm or others. If I will tell you the reason then it would impose my view on the committee which will give its report in one month."
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Terming the boiler plant blast as "the rarest kind of incident", Singh said that people maintaining the unit were the most experienced.
NTPC followed the laid down procedure to operationalise the plant and even the commissioning of the Unit-6 was delayed by six month, he said.
The commercial date of operation was April this year as the company had achieved full load of plant (running at full capacity) in March itself, he added.
The plant was declared commercially operational on September 30, 2017.
BHEL had designed, manufactured, supplied and commission the 500 MW Unit-6 at the Unchahar plant of the NTPC.
On the issue whether safety audits would be conducted on other plants of the NTPC after this accident, Singh said that it is a continuous process and the finding of the enquiry will guide us to maintain all of our plants.
Asked when can NTPC make the Unit-6 operational again, he said that it will take nearly 3-6 months to put the unit back on track.