The Nuclear Regulatory Commission announced Monday that it will undertake a five-month investigation into several recent accidental releases of radioactive water, including a tritium-contaminated leak, at the Indian Point nuclear power plant. The announcement came three days after the commission ruled that the leak at Indian Point, 35 miles (56 kilometers) north of midtown Manhattan, was not endangering anyone. In high doses, tritium can cause cancer in people. The commission said 11 NRC experts and one representative of a state government will comprise the task force. It said its review will be completed by Aug. 31 and a report will be written before the end of the year.