Summary Report for Conduct of Kozloduy NPP Stress Tests

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“Kozloduy NPP” PLC SUMMARY REPORT for Conduct of Kozloduy NPP Stress Tests 5.1.1.3 Loss of off-site power supply, emergency diesel-generator and additional dieselgenerator 5.1.1.3.1 Capacity of the batteries, operational time period and capabilities to recharge them in this situation See par. 5.1.1.2.2. 5.1.1.3.2 Actions envisioned to provide mobile on-site or off-site power supply sources There is a mobile diesel-generator (MDG) located in area of units 1 and 2 of the Kozloduy NPP which is mounted of the platform jointly with the fuel tank, control board and the power cable wound on the coil. Transportation to the platform is provided with a truck. The mobile DG is used to energize the pump of SG alternative make-up system (SG EMS) through own busbar. MDG may be connected to energize SG EMS one of the two units, though its power is sufficient to energize the pumps of both units. Total reserve of fuel and oil of the MDG ensures its uninterrupted operation at nominal power during 21 hours and 40 minutes [45]. To energize only the pump of SG alternative make-up system, this reserve is sufficient for 60 hours. 5.1.1.3.3 Competence of the shift personnel and time period required to connect mobile power supply sources. Time period required for experts to perform these activities There is an operator training centre established at the Kozloduy NPP. This system specifies the scope and duration of training for different job positions. Off-schedule trainings are envisioned in relation with changes to the regulatory requirements, modification to and introduction of new systems, procedures and instructions, etc. Planning, conducting and analyses of the delivered training results are regulated. Training is held of the full-scale simulator and emergency response exercises. All the SBEOPs are simulated at the full-scale simulator. Emergency response exercises include the shift personnel and various groups and teams according to Internal emergency response plan of the NPP. Actions of the operators in case of loss of power supply are specified in „Instruction on elimination of anticipated operational occurrences and accidents in the RI” [24] and in SBEOP for actions at blackout mode of the unit. Actions related to actuation and loading of additional DGs are specified in procedures on restoration of power supply to category III consumers of units 5 and 6 from the common-plant diesel-generator [144],[145]. Procedure has been developed on transportation and actuation of the MDG to the busbars to the rooms of SG EMS pumps. The established success criteria are the time from conditioning of alarm on complete loss of power supply to the pump actuation less than 2 hours. Meeting the criteria is confirmed in the observation sheet of the emergency response exercise. 143/202
“Kozloduy NPP” PLC SUMMARY REPORT for Conduct of Kozloduy NPP Stress Tests 5.1.1.3.4 Time period required providing alternate current power supply and restoration of core cooling before fuel damage occurs. Threshold values in plant behaviour The following conditions were assessed: Power operations; · Cold condition, pressurized primary circuit and drained SG; · Cold condition, pressurized primary circuit and non-drained SG; · Cold condition, depressurized primary circuit; · Outage cooldown of the primary circuit. For each of the modes operator actions considered in the analyses, are specified, as aimed at prolongation of time period before fuel damage occurs. Operator actions aimed at prolongation of the time period before fuel damage occurs are specified for each of the modes considered in the analyses. Table 5.1-2: Assessment of time period to fuel damage at loss of normal and standby power supply, failure to all emergency DGs, failure to additional DG. Option Time to fuel damage (h:min) 1 Power operations (Considered: passive make-up of SG; actuation of SG EMS, energized from MDG. Time depends upon the configuration of passive make-up of SG.) 2 Shut down reactor, planned cooldown at pressurized primary circuit and drained SG (Considered: actuation of SG EMS, energized from MDG; drainage of the ECCS three hydro accumulators.) 3 Shut down reactor, planned cooldown at pressurized primary circuit and non-drained SG (Considered: actuation of SG EMS, energized from MDG; drainage of ECCS three hydro accumulators.) 4 Shut down reactor, planned cooldown at depressurized primary circuit (Considered: drainage of ECCS three hydro accumulators.) 45:00÷49:00 66:44 69:44 7:28 5 Shut down reactor, outage cooldown (Considered: drainage of ECCS three hydro accumulators.) 3 days after shutdown 9:15 18 days after shutdown 16:53 144/202
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Summary Report for Conduct of Kozloduy NPP Stress Tests

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