Executive summary
Date(s) of inspection: May 2024
Aim of inspection
To support ONR’s permissioning of Torness R1 return to service, ONR chemistry inspectors conducted an inspection of significant and relevant activities during the 2024 statutory outage (13) that ensured continued Licence Condition 28 (examination, inspection, maintenance and testing) compliance and informed judgment for return to service.The inspection sampled significant outage activities in line with the R1 2024 Statutory Outage 13 Outage Intentions document. The objectives were to:
The inspection was performed in line with ONR’s guidance (as described in our technical inspection guides), which can be found at www.onr.org.uk/operational/tech_insp_guides/index.htm.
- Verify that significant outage activity has been completed in line with outage intentions documentation and maintenance schedule requirements;
- Establish confidence that the plant will continue to be able to perform and maintain chemistry compliance for the next 3 year period; and
- Form a judgement regarding readiness for return to service.
The inspection therefore considered relevant sections of LC 28, against which a rating was provided. ONR sampled records in relation to these.
The inspection was performed in line with ONR’s guidance (as described in our technical inspection guides), which can be found at www.onr.org.uk/operational/tech_insp_guides/index.htm.
Subject(s) of inspection
- LC28 - Examination, inspection, maintenance and testing - Rating: Green
Key findings, inspector's opinions and reasons for judgement made
I conducted a Chemistry inspection during statutory outage 13 in support of Torness Reactor 1 return to service.
This 1 day inspection was carried out in conjunction with ONR Structural Integrity specialists. Additional detail can be found in the structural integrity IR-53037.
This inspection focused on significant outage activities for systems required to control chemistry, specifically those associated with the Bypass Gas Plant (BPGP) and the Decay Heat Removal System (DHRS). Compliance against Licence Condition 28 (LC 28) for Examination, Inspection, Maintenance and Testing (EIMT) was therefore sampled for each of these facilities.
The one-day inspection included a walkdown of the Gas Bypass Plant and Decay Heat Removal System, and sampling of relevant documentation, with a focus on significant maintenance associated with the statutory outage. Based on my sample, I was content that appropriate EIMT was being conducted for maintaining chemistry compliance.
Conclusion
Based upon my sample within the Bypass Gas Plant and Decay Heat Removal System, I am content that appropriate EIMT was being conducted on the structures, systems and components important to maintaining chemistry compliance.
I therefore judge a green rating to be appropriate for LC28. I therefore have no objection to the TOR R1 Return to Service.