Values of the main reference parameters that are used for accident diagnosis and decisionmaking on whether or not the emergency should be declared and the emergency response plan [15], implemented are given in Table 5.2. The parameters given in this table are the high importance reference parameters which are monitored continuously. Decision about implementation of the emergency plan can also be taken on technical criteria if the current level of radiation is below the limits given in Table 5.2, but the prediction of accident development tells that these limits may be exceeded. Such decision is taken by either the Director General or Technical Director, or in case of their absence, by the Plant Shift Supervisor.
Table 5.2 Main indicators of radiological accident for decisionmaking about emergency notification and implementation of the on-site emergency plan [15]
|
Description |
Units |
Notification of emergency |
Emergency plan implementation |
|
1. Fast increase of volumetric activity of fission products in coolant: Total activity Noble gases Iodine |
Bq/kg Bq/kg Bq/kg |
7.4× 107 1.2× 105 3.7× 107 |
7.4× 108 1.2× 106 3.7× 108 |
|
2. Fast increase of volumetric activity of fission products in turbine ejectons: Noble gases Iodine |
Bq/day Bq/day |
8.3× 1014 3.7× 1011 |
8.3× 1015 3.7× 1012 |
|
3. Increase of volumetric activity of radionuclides released to the atmosphere Noble gases Iodine Long-lived aerosols |
Bq/day Bq/day Bq/day |
1.4× 1014 2.8× 109 4.5× 109 |
1.5× 1012 2.2× 1010 1.1× 1010 |
|
4. Increase of volumetric activity of radionuclides in discharges to the lake |
Bq/l |
11.1 |
1.11× 108 |
|
5. Increase of dose equivalent rate: On-site Within protection zone |
Sv/h Sv/h |
1.2× 10-3 3× 10-4 |
2.4× 10-3 6× 10-4 |
|
6. Increase of coolant discharge flow from MCC |
m3/s |
2.8× 10-3 |
1.4× 10-2 |
|
7. Increase of radionuclides specific activity in water of observant chinks |
- |
3× 10-11 |
3× 10-10 |