Rolls Royce Marine Power Operations Ltd was fined £200,000 (US$324,000) and ordered to pay costs of £176,500 (US$286,000) for exposing workers at its Derby plant to radioactive material. Marine Power Operations admitted that, in March 2011, three welders were exposed to high levels of gamma radiation when a piece of radioactive equipment broke while parts for nuclear submarines were being tested. The company pleaded guilty to seven charges brought by the British Health and Safety Executive (HSE) and Environment Agency, including violations of Sections 2(1) and 3(1) of the Health and Safety at Work etc Act 1974, Regulation 3(1)(a) of the Management of Health and Safety at Work Regulations 1999, Regulation 11 of the Ionising Radiation Regulations 1999, and Regulation 38(2) of the Environmental Permitting Regulations 2010.