Disposal of Spent Nuclear Fuel from NPP Krško EXPERIMENTAL RESEARCH ON NUCLEAR WASTE DISPOSAL Tine LOGONDER
Background • Operating time of NPP Krško (*1984 - †2023) • Long term management of radioactive waste and spent nuclear fuel from NPP Krško • Agreement between Croatia and Slovenia • Necesarry to find technically acceptable and safe permanent solution – DISPOSAL IN DEEP GEOLOGICAL FORMATIONS
Model used • Concept of SF was never devloped in Slovenia or Croatia • Swedish concept has been taken as a reference • The most devloped waste disposal concept • Has been allready adopted by Finland • Very avanced cost assessment methodology • Model is devloped on next persumptions: • Operating of NPP will end in 2023 • Only disposal – no reprocessing of SF • Respository in hard rock enviroment (depth 500m) • Storage capacity of respository will be 1531 +/- 20 fuel assemblies (620 tons)
Respository (description) • Buildigns which creates a respository: • Operations building • Storage building • Garage building • maintenance and service building • ventilation building • production building for high-pressure compacting of bentonite and preparation of backfill materials • office and workshop building • information center • rock stockpiles.
Ways to undergroun level • For personal: SERVICE SHAFT (5m in light profile – 2 elevators) • For waste and other cargo: SPIRAL RAMP (15m curve radius and 10% slope)
Canister Disposal • Deposited into 1.8 m diameter disposal bareholes • Sorrounded by 35cm of betonite • Spacing defined on the basis of thermal analysis • Disposal of canisters will start in second year after the start of operation • When disposal tunnel is full, it’ll be backfilled with compound of sand and betonite • 34 or 20 disposal tunnels
Cost Estimate Investment costs: 207.2 mio € Backfilling/Decommissioning: 28.2 mio € Operating costs: 99.0 mio € Other costs: 124.4 mio € TOTAL: 596.4 MIO €
Alternatives • Export of spent fuel to Russia (storage/reprocessing) – possibility opened in 2001 • Areas to be solved before considering acceptable: • Agreement on peaceful use of nuclear energy • Get permmision from USA to export it (for ex-Yugoslavian countries)
CONCLUSION We will see ;) Thank You!