APIS is short for Accelerated Program for Implementation of secure VVER fuel Supply, indicating that the European countries operating VVER reactors have an urgent need to qualify an alternative fuel supplier to secure the future power generation.

APIS is latin for bee and is used as an analogy to symbolize that the project comprises a large group of hard working and friendly engineers that cooperate to secure nuclear fuel to the VVER cores that have the same hexagonal shape as honeycombs.

The program is co-funded by the European Union through the Euratom Work Programme 2023–25. It was started in January 2023 and has a duration of 36 months.