Minnesota regulators knew four months ago that radioactive waste had leaked from a nuclear power plant in Monticello — but they didn't announce anything about the leak until this week.
Tritium is a radioactive isotope of hydrogen that occurs naturally in the environment and is a common by-product of nuclear plant operations. It emits a weak form of beta radiation that does not travel very far and cannot penetrate human skin, according to the Nuclear Regulatory Commission.
Mitlyng said there’s no official requirement for nuclear plants to report all tritium leaks to the Nuclear Regulatory Commission. Instead, Xcel Energy had previously agreed to report certain tritium leaks to the state. When Xcel Energy shares information with the state, it also shares it with the commission.
Rafferty said the Minnesota Pollution Control Agency decided to share information about its role overseeing the cleanup now “because we have more details about the location and potential movement of the contamination, steps being taken to control the plume and plans for remediation including short-term storage of contaminated water.”
Xcel is considering building above-ground storage tanks for the contaminated water it recovers and is considering options for the treatment, reuse or final disposal of the collected tritium and water. State regulators will review the options the company selects, the state Pollution Control Agency said.
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