MODULE “PROJECT MANAGEMENT AND CONTROL” EMERGENCY PLANNING SAFE DECOMMISSIONING OF NUCLEAR POWER...

MODULE “PROJECT MANAGEMENTAND CONTROL”

EMERGENCY PLANNING

SAFE DECOMMISSIONING OF NUCLEAR POWER PLANTS

Project BG/04/B/F/PP-166005, Programme “Leonardo da Vinci”

Project BG/04/B/F/PP-166005, Programme “Leonardo da Vinci” 2

CONTENTS

1. Regulations goals and requirements

2. Incidents and accidents analysis during decommissioning


TRAINING OBJECTIVES

Upon completion of training trainees should be able to: Describe the main requirements concerning emergency

planning during decommissioning. List the incidents and accidents which have been

analyzed in decommissioning safety reports for a specified nuclear facility (for example: KNPP decommissioning safety assessment report – incidents and accidents during preparation for safe enclosure).


REGULATION Act on the Safe Use of Nuclear Energy:

• requirements for development of internal and external emergency plans;• requirements for review, coordination and approval of plans;• requirements for organizational structure, financing, material, technical

and staff assurance;• obligations of licensees and permit holders in case of accident .

Regulation for emergency planning and emergency preparedness in case of nuclear and radiation accident:• conditions and system for development of emergency plans;• individuals applying emergency plans and their obligations;• measures for mitigation and elimination of consequences;• methods to notify population;• measures to verify emergency preparedness.


EMERGENCY PLANNING – DEFINITION, OBJECTIVES AND REQUIREMENTS

Definition• Activity for setting in an emergency plan a system of measures for

restriction and elimination of accident consequences and for establishment and maintenance of emergency preparedness.

Objectives• Restriction and mitigation of accident consequences for human health,

quality of life, property and environment.

Internal emergency plan:• measures to restrict and eliminate the accident consequences;• staff functional obligations for actions in case of accident;• interaction with executive authorities in accordance with the external

emergency plan.


RESULTS FROM EXECUTION OF EMERGENCY PLANS

Take control over accident development; Restriction and/or elimination of accident consequences; Prevent occurrence of deterministic health impact on staff and

population; Duly and appropriate treatment of exposed individuals; Decrease the probability of occurrence or restriction of stochastic

health impact on population; Prevent or restrict occurrence of non-radiation risks for staff and

population; Preservation of property; Preparation for social and economic life restoration.


INTERNAL EMERGENCY PLAN – REQUIREMENTS OF REQULATIONS

Analysis of possible accidents in a nuclear facility, resulting in radioactive release into environment, considering data from radiation and meteorological measurements

Analysis of radioactive substance releases into environment during accidents and assessment of impact on staff, population and environment

Development of scenarios for accident development


“KOZLODUY NPP” EMERGENCY PLAN – PURPOSE AND OBJECTIVES

Purpose – to establish organization ensuring:• maintenance of continuous emergency preparedness of “Kozloduy

NPP” staff;• achieving maximum effectiveness of:

• accident management and restriction itsconsequences;

• measures for protection of “KozloduyNPP” staff and the environment.


EMERGENCY PLAN – SEQUENCE OF ACTIONS, EMERGENCY STATES

Sequence of actions at:• beyond the design basis accidents;• events that may lead to non-design basis evolution of accident;• exceptional events in result of human activity off “Kozloduy NPP”

site, natural disasters, fires, floods and others violating NPPsecurity and safety.

Emergency situations according to “Kozloduy NPP”

emergency plan:• general emergency;• site area emergency;• alert.


INCIDENTS AND ACCIDENTS

Technical project for “Kozloduy” NPP units 1&2 decommissioning covers the incidents and accidents during:• phase of final reactor shutdown;• phase of safe enclosure preparation;• phase of safe enclosure operation.

Incident and accident classification:• abnormal operating mode;• accidents during the phases of safe enclosure preparation and

operation;• beyond the design basis accidents.


DECOMMISSIONING PHASES CHARACTERISTICS

In terms of nuclear safety:• risk is dramatically decreasing;• operator does not need to undertake neither automated nor urgent

corrective actions.

In terms of radiation protection – risk is decreasing phase by phase due to:• fuel is removed from core;• most radioactively contaminated systems and equipment are

decontaminated;• removal of radioactive contaminated equipment.


INCIDENTS/ACCIDENTS DURING DECOMMISSIONING PHASES

Incidents/accidents during phase “Safe enclosure preparation”:• loss of spent fuel cooling capability;• accidents at fuel handling;• loss of spent decontamination solution.

Incidents/accidents during phase “Safe enclosure operation”:• exhaust ventilation systems filter break due to undefined reason.


CONCLUSIONS

Incidents and accidents shall not result in general emergency or site area emergency.

Countermeasures against risk associated with fuel assemblies storage in spent fuel pool are considered in emergency plan.


REFERENCES

Decommissioning of Nuclear Power Plants and Research Reactors, Safety Guide, SS № WS-G-2.1 (1999)

Generic Assessment Procedures for Determining Protective Actions during a Reactor Accident, IAEA-TECDOC-955 (1997)

Act on the Safe Use of Nuclear Energy, 2002 Regulation for Emergency Planning and Emergency

Preparedness in Case of Nuclear and Radiation Accident, 2004

Technical project for decommissioning of Units 1, 2 of NPP “Kozloduy”

Emergency Plan of Kozloduy NPP

MODULE “PROJECT MANAGEMENT AND CONTROL” EMERGENCY PLANNING SAFE DECOMMISSIONING OF NUCLEAR POWER...

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