Office for Nuclear Regulation

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Heysham 1 - Quarterly Review of ONR/LC27 Compliance Inspection System Based Inspection - SBI14 - Ponds and Flasks

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake a Licence Condition (LC) compliance inspection and a system based inspection of the ponds and flasks system at EDF Nuclear Generation Limited’s (NGL’s) Heysham 1 power station in line with the planned inspection programme contained in the Heysham 1 Integrated Intervention Strategy (IIS) for 2015/16.

Interventions Carried Out by ONR

As part of this intervention, the ONR nominated site inspector undertook an LC27, Safety Mechanisms, Devices and Circuits (SMDCs), compliance inspection as well as a quarterly review of progress with ONR issues. 

In addition the ONR nominated site inspector and a civil engineering specialist inspector performed a System Based Inspection (SBI) of the ponds and flasks system to judge the system performance against its safety function.  Through examination of this system and associated sub-systems, we performed compliance inspections against Licence Condition (LC) 10 (Training), LC23 (Operating rules), LC24 (Operating instructions), LC27 (Safety mechanisms, devices and circuits), LC28 (Examination, inspection, maintenance and testing) and LC34 (Leakage and escape of radioactive material and radioactive waste).  The inspections were based on sampling the implementation of the arrangements in place against each licence condition.

Explanation of Judgement if Safety System Not Judged to be Adequate

From the inspection, we judge that overall the ponds and flasks system meets the requirements of the safety case and is adequate.

Key Findings, Inspectors' Opinions and Reasons for Judgements Made  

Prior to this inspection, a review was undertaken of the company LC27 procedures against the relevant ONR guidance documents for these licence conditions.  I judged that these procedures provide adequate arrangements to satisfy the requirements of LC27.

In order to judge the adequacy of the implementation of these arrangements, I sampled the gas circulator system and judged that appropriate SMDCs were identified and appropriate procedures were in place to ensure that the plant is not operated, inspected, maintained or tested unless the identified SMDCs are properly connected and in good working order. On the basis of the areas sampled I judged that the station compliance with LC27 was adequate with an IIS rating of 3.

With respect to the SBI the following judgements were made;

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

On the basis of the areas sampled it was judged that the station compliance with LC27 was adequate with an IIS rating of 3.

Following the system based inspection of the ponds and flasks we judged that compliance with LC23 was good with and IIS rating of 2, compliance with LC10, 24 and LC27 was adequate with an IIS rating of 3 and compliance with LC28 and LC34 was below standard. Notwithstanding this, after considering all the evidence examined during the inspections we considered that the ponds and flasks system met the requirements of the safety case.