- Rapport
- Kärnkraft
Earthing grid status
Every nuclear power plant has an underground earthing grid as part of the plant electrical safety system. It is difficult to monitor the ageing of this grid – but likewise very important.
As a step two, ageing measurements were made in a specific ageing grid. The study found that none of the methods for no-dig measurements that had been evaluated were applicable in this specific case, and the measurements were therefore performed on dug-up samples. The measurements showed no significant signs of advanced ageing.
Corrosion analysis shows that the collected samples of earthing grid would have lasted another 40-year-period (or more) in the ground during similar conditions without being severely corroded.
Rapporter och publikationer
Här listas rapporter och resultatblad från programmet.
- Rapport
Fast Frequency Support Impact On Nuclear Generation
This project assessed how Fast Frequency Support (FFS) from an HVDC link interacts with nuclear-type synchronous generator dynamics.
|2025:1145Danilo Obradovic', RISE
- Rapport
Impact of over-frequency events on Nordic NPPs
This report quantifies over-frequency events by using a simulation model of the Nordic synchronous system and simulating different faults related to the HVDC links, in combination with operating conditions of high and low inertia.
|2025:1118Matilda Arvidsson, Andreas Benjaminsson Lucas Finati Thomée, Daniel Karlsson
- Rapport
Exchange Strategies for Power Electronics in Rectifiers and UPS System for NPP
Replacing outdated power electronics in NPP auxiliary systems is crucial for maintaining operational reliability and safety.
|2025:1107Frede Blaabjerg
- Rapport
Trends of frequency deviations
In this report grid frequency statistics of the last two decades have been examined together with analysis of inertia values of the Nordic Power System. Interviews have been held with the Nordic Nuclear Production Plant owners and the Swedish and Finnish TSOs. Conclusions are made whether it exist correlations with system quantities like frequency quality, inertia, wind power production, wear and tear of nuclear plants, and system services.
|2025:1091Viktorija Dudjak, Jonas Persson, Markus Björklund