Summary Report for Conduct of Kozloduy NPP Stress Tests

“Kozloduy NPP” PLC
SUMMARY REPORT
for Conduct of Kozloduy NPP
Stress Tests
Analyses of the stress-test show large safety margins for units 3 and 4.
6.3.6.2 Measures for Units 5 and 6
Installation of additional hydrogen recombiners within the containment.
Installation of the measuring channels for monitoring and assessment of concentration of
water steaming and oxygen within the containment.
6.3.6.3 Measures for SFS
In relation with SFS, no measures are proposed to enhance robustness.
6.3.6.4 Measures for DSFS
Beyond design basis accidents such as earthquake and flooding do not result in release of
the radioactive materials to the environment [33].
6.4 CONCLUSION
The information on the management of severe accidents in KNPP shows that the following
objectives are met:
· constant emergency preparedness of the personnel;
· the activities for accident management, recovery of control structure, facility or
activity, including a combination of accidents and other emergencies, such as
explosion, fire, flooding, earthquake and limiting the consequences thereof have
been regulated;
· the necessary measures to protect personnel, public and environment, aimed at
preventing serious deterministic effects and reduce the risk of stochastic effects to as
low as reasonably achievable are in place.
Adopted procedures and instructions specify responsibility, effective communication with
national and local structures and to provide technical assistance outside KNPP. For management of
severe accidents at untits 5 and 6 Severe Accident Management Guidelines (SAMG) are developed
and their implementation is in accordance with the elaborated program.
The analysis of existing technical and operational means to protect the integrity of the
containment, and those to limit radioactive releases outside the containment zone allows for
concluding that they are effective. In addition, the following improvements can be foreseen:
· installation of additional hydrogen recombiners inside the containment;
· installation of measuring channels for monitoring and evaluating the concentration of
water vapor and oxygen inside the containment.
Finally, the organization’s emergency planning capability to operate plant in emergency
conditions, and current operational and technical measures confirm the preparedness of NPP
"Kozloduy" for severe accident management [153].
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