Contamination of drinking water by radiation at the state-run Kaiga atomic power plant in northwest Karnataka has been contained to avert harm to the public, health and environment, a senior official said on Sunday.

"The water cooler, which was contaminated by a radioactive element (Tritium) was isolated and put out of use November 25. The incidence has, however, not affected public, safety, health and environment," plant director JP Gupta said from Kaiga, about 500 km from here.