[en] Full text: This paper discusses the potential combined off-site radiological impacts of the reference accidents for OPAL multipurpose research reactor, ANSTO radiopharmaceutical production and ANSTO Nuclear Medicine facilities’, and the protection strategy that would be employed if such a scenario were to occur. For the Lucas Heights Radiological Hazard Assessment and Protection Strategy the ANSTO Lucas Heights campus fence line is prudently considered the boundary between on-site and off-site as described in IAEA GSR Part 7 (2015). The Lucas Heights Radiological Hazard Assessment and Protection Strategy has been prepared as a technical document in support of the Lucas Heights subplan to the New South Wales State Emergency Management Plan (EMPLAN). This details the hazard assessment and protection strategy for aspects of the preparation for, response to, and immediate recovery from a radiological or nuclear emergency occurring at Lucas Heights. The off-site radiological impact of the combined reference accidents is assessed for adults, children and infants over an exposure period of 50 years using conservative assumptions, such as unfavourable meteorological conditions and lack of response actions, such as sheltering (no sheltering during the exposure period). This hazard assessment supports the preparation for, and the response to, a substantial radioactive release, including radiological monitoring, other response actions, and communication with relevant parties (response agencies, government agencies, members of the public, etc). The protection strategy describes the outcomes required in response to a radiological emergency during all its phases, and how this will be achieved. The aim is to prevent severe deterministic effects, reasonably reduce the risk of stochastic effects, and to ensure the safety of emergency workers and helpers. (author)