[en] The latest threat to the safety and security of nuclear and radiation facilities, is the possibility of cyber attack on the digital assets of these facilities. The threats may be different from the usual threats to the safety and security of the nuclear facilities and their remedies may also be different and require innovative thinking and preparation by the regulatory body. The result of any such possibility may be damaging enough for the public, environment and the workers so as to warrant a comprehensive preparation by the regulatory authority to guard against any such happenings. In this paper we have identified the responsibilities of a regulatory body to counter such threats. The regulatory authority has to assess the laws enacted for cyber security and suggest improvements required for nuclear facilities; develop regulations and guides and review them periodically and issue guidelines for the development of cyber security policy and review the cyber security policies of facilities. Further, enhancing awareness among all the personnel of the facilities must also be ensured by the regulatory authority. Education and training is the key to avoid these problems. Majority of attackers utilize social engineering techniques at some stage of their attack. In order to fulfill these responsibilities, it is important that a team is build comprising of resources from computer hardware, software, communications and I&C. (author)