Summary Report for Conduct of Kozloduy NPP Stress Tests
Summary Report for Conduct of Kozloduy NPP Stress Tests
Summary Report for Conduct of Kozloduy NPP Stress Tests
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“<strong>Kozloduy</strong> <strong>NPP</strong>” PLC<br />
SUMMARY REPORT<br />
<strong>for</strong> <strong>Conduct</strong> <strong>of</strong> <strong>Kozloduy</strong> <strong>NPP</strong><br />
<strong>Stress</strong> <strong>Tests</strong><br />
2.5.1.2.1.9 MCR, ECR boards<br />
The metal structures on the boards and panels <strong>of</strong> MCR and ECR are seismically qualified as<br />
category 1. The monitoring and control instrumentation is seismically qualified.<br />
2.5.1.2.1.10 I&C equipment<br />
Safety systems I&C systems are operable in all modes <strong>of</strong> unit operation, including loss <strong>of</strong><br />
auxiliary power supply (item 7.3.1.1 [7], [8]). The systems are seismically qualified as Seismic<br />
category 1.<br />
2.5.1.2.1.11 Neutron flux monitoring equipment (NFME)<br />
The hardware <strong>of</strong> neutron flux monitoring equipment, as well as equipment <strong>for</strong> reactor<br />
emergency protection bear seismic impacts with intensity corresponding to safe shutdown<br />
equipment (DBE) up to 8 points by MSK-64 scale at the elevation + 24,6 m, + 13,2 m, minus 4,2 m<br />
– I category; equipment <strong>of</strong> automatic power controller and power limiting controller is qualified <strong>for</strong><br />
II category according to item 7.2.4.5.1 [7],[8]. According to item 7.2.4.5.2 [7],[8] the NFME set<br />
corresponds to [73].<br />
2.5.2 The main operational measures to bring and maintain units 5 and 6 in safe shutdown<br />
state after an earthquake<br />
As the results <strong>of</strong> the per<strong>for</strong>med review [44] the following main operational and emergency<br />
measures were established to prevent from the core or SNF damage after an earthquake:<br />
· seismic monitoring and control system. At the same time personnel action plan<br />
during and after an earthquake was developed, [74] .<br />
· emergency plan. There is system <strong>for</strong> relation and interaction <strong>of</strong> emergency plan <strong>of</strong><br />
<strong>Kozloduy</strong> <strong>NPP</strong> [28] with the national emergency services and inclusion <strong>of</strong> the emergency<br />
actions at the plant in the National Emergency Plan [75].<br />
· personnel action plan during and after an earthquake has been <strong>for</strong>eseen and<br />
implemented [76].<br />
· emergency Instruction detailing the actions at an earthquake has been developed and<br />
implemented [77].<br />
· event emergency procedure <strong>for</strong> personnel actions during an earthquake has been<br />
developed and implemented [78].<br />
· mobile equipment. A diesel-generator is provided. Mobile diesel pumps <strong>for</strong><br />
emergency water pumping are featured, item 6 [79].<br />
· Unit 5 and 6 equipment surveillance programme has been developed and is being<br />
observed, [81].<br />
· trials and functional tests <strong>of</strong> the equipment are per<strong>for</strong>med. The actions <strong>for</strong> assessment<br />
<strong>of</strong> the technical condition <strong>of</strong> the SSCs are planned in such a way, that their per<strong>for</strong>mance is<br />
preventive, be<strong>for</strong>e occurrence <strong>of</strong> their damage, in order to reduce failure probability.<br />
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