Office for Nuclear Regulation

Heysham 2 - SBI01 and LC6 Inspection

Executive summary

Purpose of Intervention

The purpose of this intervention was to carry out a system based inspection at EDF Energy Nuclear Generation Limited’s (NGL’s) Heysham 2 power station in line with the planned inspection programme contained in the Heysham 2 Integrated Intervention Strategy (IIS) for 2018/19. 

Interventions Carried out by ONR

A civil engineering specialist inspector, assisted by the Heysham 2 nominated site inspector and two external hazards specialist inspectors performed a system based inspection (SBI) of the sea defences, flood protection and drainage system to judge the system performance against its safety function.  Through examination of this system and associated sub-systems, we performed compliance inspections against the following Licence Conditions (LCs):

I, the nominated site inspector undertook an  LC6 compliance inspection which involved the consideration of both generic and local implementation documents as defined within the licensee’s arrangements. The following areas were covered as part of the inspection:

During the visit the nominated inspector held discussions with the station director and with the licensee’s internal safety regulator.

During the inspection week, the Heysham 1 and 2 nominated site inspectors attended the Emergency Preparedness Consultative Committee (EPCC) which was held at the Lancaster Police headquarters. During the meeting the ONR inspectors provided an overview of each stations’ performance for the recent Level 1 exercises and shift exercises and of  recent organisational changes within ONR.

Explanation of Judgement if Safety System not judged to be Adequate

From the areas sampled during this inspection, we judged that overall the sea defences flood protection and drainage system met the requirements of the safety case.

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

With respect to the system based inspection the following judgements were made;

In carrying out our inspection against LC 27 we observed a shortfall in compliance against LC 22 (Modification or experiment on existing plant) relating to the failure of the licensee to update documentation relating to the Quadrant Excess Drainage pumps following production of an Engineering Change. In response to our finding, the licensee raised a Condition Report to update the relevant documentation. As this type of shortfall forms part of a current intervention by the licensee’s Independent Nuclear Assurance team, we were content for the ONR nominated site inspector to follow up progress with this matter as part of routine regulatory business.   

The LC6 inspection identified areas of good practice; however, the inspection also identified two areas where the licensee’s arrangements had minor shortfalls. I have therefore elected to raise two ONR regulatory issues in order to monitor the licensee’s progress of them. Notwithstanding these two minor shortfalls, I considered that, based on the evidence sampled for this compliance inspection, compliance with LC 6 met ONR’s expectations and hence assigned an inspection rating of Green

The intervention was performed in line with ONR's guidance requirements (as described in our technical inspection guides) in the areas inspected.

Conclusion of Intervention

Following the system based inspection of the, sea defences, flood protection and drainage system we judged that compliance with LC10, 23, 24, 27, 28 and 34 met the expected standards and were rated as Green. A single ONR issue has been raised relating to the training which will be followed up by the site inspector.  Overall, we judged that the sea defences, flood protection and drainage system met the requirements of the safety case.

Following the LC 6 Compliance inspection, two ONR issues were raised in order for the site inspector to follow the licensee’s progress of them.  Notwithstanding these two minor shortfalls, the nominated site inspector judged that compliance with LC6 met ONR’s expectations and hence assigned an inspection rating of Green.

As A result of ONR inspections 3 ONR issues have been raised in order to monitor the licensee’s progress of them.

There were no findings from this inspection that could significantly undermine nuclear safety.  At present, no additional regulatory action is needed over and above the planned interventions of Heysham 2 power station as set out in the integrated intervention strategy, which will continue as planned.