The inspection is a key step in the run-up to the commissioning of a nuclear plant before the regulator grants permission for loading the fuel.
"This inspection will take about 10 to 12 days. The report of inspection will be submitted to the Atomic Energy Regulatory Board for its review and obtaining clearance for fuel loading," the Nuclear Power Corporation of India (NPCIL) said in a statement.
The work on the KNPP was suspended from September, 2011 to March 19, 2012 due to protests over its safety and concerns about the impact of the project on environment.
Earlier this week, NPCIL Chairman-cum-Managing Director Kailash Chandra Purohit had said that the first unit of KNPP was in the final stages of commissioning and he expected the fuel to be loaded in the nuclear plant by end of July.
"The reactor pressure vessel (RPV) is the heart of the reactor, which houses the fuel assemblies. This pre-service inspection will provide the reference base line data for future, apart from validating the functioning of automatic inspection machine," the NPCIL said.
The RPV will be inaccessible after start of operation, the subsequent inspections will be carried out remotely using the same machine.
During the life-time of the plant, inspections would be carried out once in four years, the NPCIL said. MORE