Office for Nuclear Regulation

Exercise Evening Star and Annual Review of Safety

Executive summary

Purpose of intervention

The purpose of this intervention was to observe the triennial Level 2 emergency exercise undertaken at HMNB Clyde (Faslane) on 2nd September 2015.  ONR were present to observe the exercise as the Enforcing Authority for the Radiation (Emergency Public Preparedness and Public Information Regulations) 2001 (REPPIR).  ONR observe these exercises to ensure that they are completed every 3 years as required by the regulations, that all of the relevant participants take part and that lessons are learned and the plan and multi-agency arrangements are improved as a result.  The ONR nominated Site Inspector also attended the Annual Review of Safety (ARoS) at HMNB Clyde on 3 September 2015.

Interventions Carried Out by ONR

The Level 2 exercise intervention consisted of a site exercise brief and familiarisation visit to HMNB Clyde (Faslane) on the afternoon of the 1 September 2015 followed by observation of the exercise on the 2 September 2015. 

The ARoS was a formal meeting to discuss the nuclear safety performance of the HMNB Clyde site over the previous 12 months.   It was attended by the ONR nominated Site Inspector.

Key Findings, Inspector's Opinions and Reasons for Judgements Made

The exercise provided the opportunity to test the effectiveness of the Operators On-Site Emergency Plan and the Clyde Off-Site Emergency Plan (Issue 2, August 2015), in response to a postulated Off Site Nuclear Emergency in a nuclear powered submarine.  ONR observers were located at Operational, Tactical and Strategic locations.  At the end of the exercise I collated feedback and observations from ONR and DNSR observers on what went well and on potential areas for improvement and fed this back at the hot debrief session. 

At the ARoS meeting, the HMNB Clyde representatives undertook a review of safety performance over the past year, observed by regulators, including ONR.  The ONR inspector present was satisfied that a comprehensive and challenging review of safety had been carried out by site. 

Conclusion of Intervention

I was able to confirm that the exercise constituted a test of the plan prepared under Reg 9(1) of the REPPIR regulations and demonstrated in accordance with Regulation 10(1)(b).

The intervention did not identify any matter impacting on nuclear safety that required immediate regulatory action.