The emissions of radioactive fission and activation products into water amounted to 0.04% and tritium emissions to 8.9% of the limit value specified by the authorities.
Fission and activation products TBq
| 0.0001 | 0.0003 | 0.0002 | 0.0001 | 0.00008 |
% of allowed amount
| 0,04 | 0,09 | 0,05 | 0,04 | 0.03 |
| Tritium TBq | 1.62 | 2.46 | 2.32 | 2.05 | 1.56 |
% of allowed amount
| 8.9 | 13.5 | 12.7 | 11.2 | 8.5 |
Sanitary wastewater is treated at the Olkiluoto wastewater treatment plant before it is discharged into the sea. In 2018, the total volume of sanitary water treated was 89,558 m3. The phosphorus load discharged into the sea was 11 kg and the nitrogen load 4,380 kg. The biological oxygen demand (BOD7ATU) was 913 kg. The treatment of sanitary wastewater is based on the permit regulations specified for the purification efficiency and loads discharged into water bodies, as well as regulatory requirements. Emissions from the sanitary wastewater treatment plant were a fraction of the nutrient load of River Eurajoki running to the north of Olkiluoto, totalling of nitrogen. Water quality measurements are carried out by an external operator.
* Load caused
by the River Eurajoki in year 2017
| Amount of water (m3) | 89,558 | 97,207 | 88,606 | 77,093 | 66,389 |
| Concentration (mg/l)1) |
|
|
|
|
|
| BOD7ATU | 10 | 8 | 13 | 4.7 | 6.6 |
Phosphorus
| 0.12 | 0.12 | 0.24 | 0.10 | 0.11 |
Treatment efficiency average
|
|
|
|
|
|
| BOD7ATU | 96 | 96 | 94 | 97 | 96 |
| Phosphorus | 99 | 98 | 98 | 99 | 99 |
| Load on sea area (kg) |
|
|
|
|
|
| Phosphorus | 11 | 12 | 21 | 7.7 | 7.3 |
| Nitrogen | 4,380 | 5,840 | 4,380 | 3,541 | 2,993 |
| BOD7ATU | 913 | 767 | 1,132 | 361 | 438 |
| Water treatment chemicals (t)2) | 35 | 39 | 34 | 22 | 24 |
1) The permit regulation for the sanitary waste water:
The maximum BOD7ATU value of waste water discharged into the seas is
13 mg O2/l and the maximum phosphorus concentration is 0,52 mg P/l.
The minimum treating efficiency for the BOD7ATU value and phosphorus
is 95%. All values are calculated as annual averages. 2) Chemicals used for the
treatment of sanitary waste water.
Emissions to the soil
An environmental accident took place at the Olkiluoto nuclear power plant in 2018 when oil leaked from a work machine into the soil. A total of 9 metric tons of contaminated soil was removed. During the year, an accident that had occurred during the construction of OL1 plant unit was also detected. Corrective measures were carried out supervised by an external operator, and a total of 250 metric tons of contaminated soil was removed. Five cases of minor environmental damage also took place. In two of these accidents, a total of 11 liters of oil ended up in the soil. All oil was recovered, and the used spill control materials were delivered to appropriate further processing.
