EXPERIMENTAL RESEARCH ON NUCLEAR WASTE DISPOSAL

Disposal of Spent Nuclear Fuel from NPP Krško

Tine LOGONDER

BackgroundOperating time of NPP Krško (*1984 - †2023)

Long term management of radioactive waste and spent nuclear fuel from NPP Krško

Agreement between Croatia and SloveniaNecesarry to find technically acceptable and safe

permanent solution – DISPOSAL IN DEEP GEOLOGICAL FORMATIONS

Model usedConcept of SF was never devloped in Slovenia

or CroatiaSwedish concept has been taken as a

referenceThe most devloped waste disposal conceptHas been allready adopted by FinlandVery avanced cost assessment methodology

Model is devloped on next persumptions:Operating of NPP will end in 2023Only disposal – no reprocessing of SFRespository 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 buildingStorage buildingGarage buildingmaintenance and service

buildingventilation buildingproduction building for high-

pressure compacting of bentonite and preparation of backfill materials

office and workshop building information center rock stockpiles.

Ways to undergroun levelFor personal: SERVICE SHAFT (5m in light

profile – 2 elevators)For waste and other cargo: SPIRAL RAMP

(15m curve radius and 10% slope)

Canister DisposalDeposited 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 EstimateInvestment 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 energyGet permmision from USA to export it (for ex-

Yugoslavian countries)

We will see ;)

Thank You!

CONCLUSION