Prevention of accidental risks and nuclear safety The fundamental internationally adopted principle underpinning the specific organisational system and regulations applicable to nuclear safety is that of the responsibility of the licensee (see chapter 2). The public authorities ensure that this responsibility is fully assumed, in compliance with the regulatory requirements. As regards the prevention of risks for workers, BNI licensees are required to implement all necessary means to protect workers against the hazards of ionising radiation. They must more particularly ensure compliance with the general rules applicable to all workers exposed to ionising radiation (work organisation, accident prevention, medical monitoring of workers, including those of outside contractors, etc.). As regards protection of the population and the environment, the BNI licensee must also take all necessary steps to achieve and maintain an optimum level of protection. More particularly, discharges of liquid and gaseous effluents, whether radioactive or not, are strictly limited (see chapter 3). 2.2.2 Transport of radioactive substances When transporting radioactive substances, the main risks are those of internal or external exposure, of criticality, and risks of a chemical nature. Safe transport of radioactive substances relies on an approach called “Defence in Depth”: ∙ The robustness and the packaging is the first line of defence. The packaging plays a vital role and must withstand the foreseeable transport conditions. ∙ The reliability of the transport operations constitutes the second line of defence. ∙ Finally, the third line of defence is the means of response implemented in the event of an incident or accident. RADON POTENTIAL ZONES IN METROPOLITAN FRANCE DEFINED BY THE ORDER OF 27 JUNE 2018 Zones with low radon potential Zones with low radon potential but in which specif ic geological factors can facilitate radon transfer to buildings Zones with signif icant radon potential Radon potential zones def ined, according to the radon exhalation fluxes from the ground: Source: IRSN. ASN Report on the state of nuclear safety and radiation protection in France in 2021 105 01 – NUCLEAR ACTIVITIES: IONISING RADIATION AND HEALTH AND ENVIRONMENTAL RISKS 08 07 13 04 10 06 12 14 03 09 05 11 02 01 AP
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