The system of producing self-sustaining nuclear reaction is referred as _____?

The system of producing self-sustaining nuclear reaction is referred as _____?

خود کو برقرار رکھنے والے جوہری رد عمل کو پیدا کرنے کے نظام کو _____ کہا جاتا ہے؟
Explanation

A nuclear reactor is a system designed to initiate and control a self-sustaining nuclear chain reaction.

It is mainly used for power generation, research, and production of isotopes.