In India, why are some nuclear reactors kept under “IAEA Safeguards” while others are not? [2020]

In India, why are some nuclear reactors kept under “IAEA Safeguards” while others are not?

Some use Uranium and others use thorium.
Some use imported uranium and others use domestic supplies.
Some are operated by foreign enterprises and others are operated by domestic enterprises.
Some are State- owned and others are privately-owned.

Nuclear reactors using imported uranium are often placed under International Atomic Energy Agency (IAEA) safeguards to ensure the nuclear material is used exclusively for peaceful purposes and not for military applications. In contrast, reactors that utilise domestic uranium may not be subject to the same level of international oversight. This step was taken by India in 2014 to demonstrate that its nuclear energy programme was for peaceful purposes. This is a necessary step under the Indo-US nuclear deal. India procures nuclear fuel through spot deals with several countries, including Kazakhstan, Russia, France, Uzbekistan, and Canada. These agreements enable India to quickly acquire the necessary uranium to meet the fuel requirements of its nuclear reactors under IAEA safeguards.

IAEA was established in 1957 as an autonomous organisation within the United Nations system.
This intergovernmental organisation was established under the “Atoms for Peace” initiative proposed by U.S. President Dwight D. Eisenhower.
Though established independently by the UN through its own international treaty, the agency reports to the UN General Assembly and the Security Council.
Objective: Inhibit nuclear use for any military purpose, including nuclear weapons.
Headquarters: Vienna, Austria.
Member: over 170 countries; India is a member.