The Office of Atoms for Peace (OAP) of Thailand (สำนักงานปรมาณูเพื่อสันติ) in Chatuchak district, Bangkok, Thailand, was established in 1961 as the Office of Atomic Energy for Peace.

The OAP serves as the main authority for nuclear research in Thailand.

The research topics and services provided at the OAP include radioisotope production, gamma radiography, neutron activation analysis, neutron radiography, and gemstone irradiation.

The TRR-1/M1 is of the type TRIGA Mark III, built by General Atomics, and began operation in 1962 after being commissioned in 1961 as a 1MW reactor.

The TRR-1/M1 underwent its modification during 1975-1977, at which point it began operation as a 2MW reactor.