India loads fuel at a new reactor and restarts another after refurbishment
Serguey Asael Shinder1 min readNuclear Power Corporation of India (NPCIL) reported two fuel-loading milestones. At Rajasthan Atomic Power Project unit 8 (RAPP-8), fuel loading began at 15:18 on 19 September 2026, after permission from the Atomic Energy Regulatory Board (AERB) and "completion of all prescribed pre-requisites". Separately, fuel loading has begun at Kaiga unit 1 as it starts the process of returning to service after refurbishment. NPCIL has also started geotechnical investigations for the next two units at the Rajasthan site.
The next major steps for RAPP-8 include first approach to criticality and grid synchronisation, in the standard commissioning sequence.
What it means
Fuel loading is the point of no easy return, and that is why it is a milestone. Everything before it is construction; from here the reactor is a nuclear facility under a different regulatory regime. The AERB permission is the load-bearing fact, not the timestamp — it means the pre-conditions were signed off.
One new unit and one refurbished restart is the shape of a fleet that is both building and maintaining. Kaiga-1 returning from refurbishment is life-extension; RAPP-8 is new capacity; the geotechnical work is the pipeline behind both. A programme doing all three at once is running at scale, which is the story India's nuclear build has been telling for several years.
Criticality and synchronisation are the dates that matter next. Fuel in the core is not power on the grid. The commissioning steps NPCIL lists — first criticality, then synchronisation — are where RAPP-8 becomes generation, and those are the milestones to watch for.