Long Term Operation for Borssele and Ringhals
LTO EPZ & Ringhals
27 May 2020
A complete LTO approach was set up.
Performed on both Borssele and Ringhals NPPs
Both LTO projects have led to regulator approval.
LTO at NRG
The LTO team of NRG led by Frederic Blom is involved in many LTO projects. These are spread far and wide: from Sweden to Argentina. The LTO team offers:
- Reliable and independent LTO services
- Tailored to each specific nuclear power plant
- Consultants with global experience
- Our in-house developed TULIP approach
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Long term operation: searching the best approach
There is need for a generally accepted approach for Long Term Operation (LTO) assessment of Nuclear Power Plants, as an increasing part of the nuclear fleet approaches the original design lifetime. Specific IAEA guidelines are written to provide such an approach, but these do not include all beneficial analyses. Two examples will be given of LTO assessment projects which have used these IAEA guidelines, plus some additional analyses. Borssele NPP in The Netherlands used IAEA safety guide 57 as a basis for their LTO assessment project. The experience gained in the Borssele LTO assessment project has been used for the set-up of the LTO assessment project for Ringhals NPPs in Sweden.
Borssele LTO assessment project
There is need for a generally accepted approach for Long Term Operation (LTO) assessment of Nuclear Power Plants, as an increasing part of the nuclear fleet approaches the original design lifetime. Specific IAEA guidelines are written to provide such an approach, but these do not include all beneficial analyses. Two examples will be given of LTO assessment projects which have used these IAEA guidelines, plus some additional analyses. Borssele NPP in The Netherlands used IAEA safety guide 57 as a basis for their LTO assessment project. The experience gained in the Borssele LTO assessment project has been used for the set-up of the LTO assessment project for Ringhals NPPs in Sweden.
Performing to governmental standards
There is need for a generally accepted approach for Long Term Operation (LTO) assessment of Nuclear Power Plants, as an increasing part of the nuclear fleet approaches the original design lifetime. Specific IAEA guidelines are written to provide such an approach, but these do not include all beneficial analyses. Two examples will be given of LTO assessment projects which have used these IAEA guidelines, plus some additional analyses. Borssele NPP in The Netherlands used IAEA safety guide 57 as a basis for their LTO assessment project. The experience gained in the Borssele LTO assessment project has been used for the set-up of the LTO assessment project for Ringhals NPPs in Sweden.
Scoping, screening and Ageing management Review
As a starting process for the assessment in LTO “Bewijsvoering” the scoping was performed. Within this step, all SSCs in Scope of LTO were identified on a system level based on the criteria from IAEA Safety Report No.57. The Ageing Management Review (AMR) involved detailed technical evaluation of in-scope passive long-lived components (e.g. Main Coolant piping) as well as passive subcomponents of active longlived SCs (e.g. Main Coolant Pump casing) to demonstrate that the effects of ageing are adequately managed such that the intended function(s) will remain consistent with the KCB licensing basis during Long-Term Operation. All reports were reviewed by the Dutch nuclear regulatory authority.
Active components
There is need for a generally accepted approach for Long Term Operation (LTO) assessment of Nuclear Power Plants, as an increasing part of the nuclear fleet approaches the original design lifetime. Specific IAEA guidelines are written to provide such an approach, but these do not include all beneficial analyses. Two examples will be given of LTO assessment projects which have used these IAEA guidelines, plus some additional analyses. Borssele NPP in The Netherlands used IAEA safety guide 57 as a basis for their LTO assessment project. The experience gained in the Borssele LTO assessment project has been used for the set-up of the LTO assessment project for Ringhals NPPs in Sweden.
Revalidation of reactor pressure vessel
As a starting process for the assessment in LTO “Bewijsvoering” the scoping was performed. Within this step, all SSCs in Scope of LTO were identified on a system level based on the criteria from IAEA Safety Report No.57. The Ageing Management Review (AMR) involved detailed technical evaluation of in-scope passive long-lived components (e.g. Main Coolant piping) as well as passive subcomponents of active longlived SCs (e.g. Main Coolant Pump casing) to demonstrate that the effects of ageing are adequately managed such that the intended function(s) will remain consistent with the KCB licensing basis during Long-Term Operation. All reports were reviewed by the Dutch nuclear regulatory authority.
Revalidation of fatigue
There is need for a generally accepted approach for Long Term Operation (LTO) assessment of Nuclear Power Plants, as an increasing part of the nuclear fleet approaches the original design lifetime. Specific IAEA guidelines are written to provide such an approach, but these do not include all beneficial analyses. Two examples will be given of LTO assessment projects which have used these IAEA guidelines, plus some additional analyses. Borssele NPP in The Netherlands used IAEA safety guide 57 as a basis for their LTO assessment project. The experience gained in the Borssele LTO assessment project has been used for the set-up of the LTO assessment project for Ringhals NPPs in Sweden.
Revalidation of leak before break
There is need for a generally accepted approach for Long Term Operation (LTO) assessment of Nuclear Power Plants, as an increasing part of the nuclear fleet approaches the original design lifetime. Specific IAEA guidelines are written to provide such an approach, but these do not include all beneficial analyses. Two examples will be given of LTO assessment projects which have used these IAEA guidelines, plus some additional analyses. Borssele NPP in The Netherlands used IAEA safety guide 57 as a basis for their LTO assessment project. The experience gained in the Borssele LTO assessment project has been used for the set-up of the LTO assessment project for Ringhals NPPs in Sweden.
The goal of the review is to demonstrate that the Break Preclusion concept (Bruchausschluß) as entered in 1997 remains valid in case of life time extension to 2034. From the assessment it is concluded that the time dependent assumptions in LBB TLAAs are not restricting operation for 60 years
Qualification of Design Base Accident resistant electrical Equipment (EQDBA)
As a starting process for the assessment in LTO “Bewijsvoering” the scoping was performed. Within this step, all SSCs in Scope of LTO were identified on a system level based on the criteria from IAEA Safety Report No.57. The Ageing Management Review (AMR) involved detailed technical evaluation of in-scope passive long-lived components (e.g. Main Coolant piping) as well as passive subcomponents of active longlived SCs (e.g. Main Coolant Pump casing) to demonstrate that the effects of ageing are adequately managed such that the intended function(s) will remain consistent with the KCB licensing basis during Long-Term Operation. All reports were reviewed by the Dutch nuclear regulatory authority.
Applying the lessons learned elsewhere: Ringhals LTO
There is need for a generally accepted approach for Long Term Operation (LTO) assessment of Nuclear Power Plants, as an increasing part of the nuclear fleet approaches the original design lifetime. Specific IAEA guidelines are written to provide such an approach, but these do not include all beneficial analyses. Two examples will be given of LTO assessment projects which have used these IAEA guidelines, plus some additional analyses. Borssele NPP in The Netherlands used IAEA safety guide 57 as a basis for their LTO assessment project. The experience gained in the Borssele LTO assessment project has been used for the set-up of the LTO assessment project for Ringhals NPPs in Sweden.
The goal of the review is to demonstrate that the Break Preclusion concept (Bruchausschluß) as entered in 1997 remains valid in case of life time extension to 2034. From the assessment it is concluded that the time dependent assumptions in LBB TLAAs are not restricting operation for 60 years
Conclusion
As a starting process for the assessment in LTO “Bewijsvoering” the scoping was performed. Within this step, all SSCs in Scope of LTO were identified on a system level based on the criteria from IAEA Safety Report No.57. The Ageing Management Review (AMR) involved detailed technical evaluation of in-scope passive long-lived components (e.g. Main Coolant piping) as well as passive subcomponents of active longlived SCs (e.g. Main Coolant Pump casing) to demonstrate that the effects of ageing are adequately managed such that the intended function(s) will remain consistent with the KCB licensing basis during Long-Term Operation. All reports were reviewed by the Dutch nuclear regulatory authority.
More information?
Contact the LTO team of NRG led by Frederic Blom.
