The primary purpose of this intervention was to:
In addition to the above, I also inspected the following on behalf other ONR nuclear safety inspectors who were unable to visit DNB due to COVID-19 restrictions:
This intervention was undertaken by an ONR C&I specialist nuclear safety inspector and involved undertaking plant walkdowns and holding discussions with relevant stakeholders in accordance ONR’s and EDF NGL’s COVID-19 secure arrangements.
The primary purpose aspects of this intervention were undertaken in relation to the following Licence Conditions (LCs), which are applicable provisions of the Energy Act 2013:
The intervention was performed in line with ONR's guidance requirements (as described in our technical inspection guides) in the areas inspected.
During the inspection that I undertook of a sample of C&I equipment cubicles / panels and equipment associated with several R21 and R22 safety circuit systems, I did not identify any significant signs of age-related degradation with respect to the items I examined.
I also met with the relevant system health engineers (SHEs) to discuss the health of the C&I equipment and their RTS preparations.
Based on the findings of this aspect of the intervention I have assigned an integrated intervention strategy (IIS) rating of Green to LC 28 (EIMT) compliance.
I reviewed the new AutoBED valve system control cubicles and associated cabling installation work, I was content that adequate installation activities have been undertaken. I also considered the cubicles to have been well manufactured.
I also met the chairperson of the test and commissioning panel (T&CP) and discussed the oversight that the panel had of the AutoBED valve system installation, test and commissioning work. As a result of this discussion, I am content that the T&CP did have adequate oversight of this work.
Based on the findings of this aspect of the intervention I have assigned an IIS rating of Green to LC 22 (modification or experiment on existing plant) compliance.
During the intervention I reviewed the work that had / was being undertaken in relation to the remediation of station transformer corrosion and ABDS installation. This was undertaken on behalf of other ONR specialist nuclear safety inspectors.
I have raised three regulatory issues during the intervention, which I consider to be minor shortfalls and will monitor them through to resolution as part of normal regulatory business..
Based on the sample of safety circuit equipment that I visually inspected, and the information provided to me during this aspect of the intervention, I consider that adequate C&I equipment EMIT activities are being undertaken by DNB. I have therefore assigned an intervention rating of Green to LC 28 (EIMT) compliance.
Based on the sample of the AutoBED valve system equipment that I inspected, and the information provided to me during this aspect of the intervention, it appears that adequate installation activities have been undertaken in relation to this system. I have therefore assigned an IIS rating of Green to LC 22 (modification or experiment on existing plant) compliance.
During this intervention I did not identify any issues that pose an immediate significant threat to nuclear safety. Nor did I identify any C&I equipment related issue that would prevent ONR providing a Consent for DNB to RTS.