Nuclear Electrica – Cernavoda Nuclear – CANDU 6

MAJOR OBJECTIVES FOR 2011

  • PLANT GROSS CAPACITY FACTOR  ≥95% (CONTINUOUS OPERATION BETWEEN PLANNED OUTAGES);
  • NUMBER OF REPORTABLE EVENTS ≤8;
  • DECREASE OF INTERNAL DOSE WEIGHT IN THE TOTAL DOSE ( ≤20%);
  • CONSOLIDATION OF THE ORGANIZATION & LEADERSHIP (“ALL THAT IS GOOD”);
  • EFFICIENT UTILIZATION OF HUMAN RESOURCES AND OPTIMIZATION OF THE NUMBER OF EMPLOYEES IN THE ORGANIZATION;
  • OPTIMIZATION OF O&M COSTS & WAREHOUSE STOCKS;
  • SUCCESSFULLY PASS THE “STRESS TESTS”.

KEY BACKGROUND POINTS:

  • CANDU 6 REACTORS HAVE TWO SEPARATE, REDUNDANT FAIL-SAFE SHUTDOWN SYSTEMS, (ONE SEISMICALLY QUALIFIED) (SECONDARY CONTROL ROOM SEISMICALLY QUALIFIED);
  • LARGE VOLUME OF COOLING WATER IS CONTAINED IN THE DOUGING TANK OF THE REACTOR BUILDING (APPROX. 3000 Mg) READY TO SUPPRES THE PRESURE OR TO COOL BY GRAVITY THE REACTOR CORE;
  • THE CANDU 6 REACTOR CORE INCLUDES A LARGE VOLUME OF LOW-TEMPERATURE, LOW PRESSURE MODERATOR WATER (APPROX 260Mg) WHICH PROVIDES AN
  • INHERENT BACKUP HEAT SINK. THE LARGE THERMAL CAPACITY OF THIS WATER, AND THE SURROUNDING SHIELDING VAULT WATER (APPROX 600Mg), PROVIDES AN INTERIM HEAT SINK.
  • FEEDWATER SHUTDOWN COOLING AND MODERATOR SYSTEMS OPERATE UNDER CLASS IV AND CLASS III POWER (INDEPENDENT DIESEL GENERATORS);
  • IF CLASS IV AND CLASS III POWER ARE UNAVAILABLE, SEISMICALLY QUALIFIED EPS WILL BE STARTED. IN THIS CASE, PUMPED EMERGENCY WATER SUPPLY (EWS) OPERATING UNDER EPS CAN ENSURE LONG TERM FUEL COOLING;
  • FOLLOWING TOTAL LOSS OF OFF-SITE AND ON-SITE POWER, THE STEAM GENERATOR HEAT SINK IS MAINTAINED BY MAKE-UP TO STEAM GENERATORS BY GRAVITY FROM THE DOUDING TANK, AFTER STEAM GENERATOR RAPID COOLDOWN.
  • CERNAVODA NPP CANDU 6 NATURAL URANIUM FUEL BUNDLES ARE GRADUALLY DISCHARGED DURING REACTOR OPERATION AND ARE STORED IN THE BAY FOR ABOUT 6 YEARS BEFORE THEY CAN BE MOVED TO PASSIVE AIR-COOLED DRY STORAGE
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