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Belene NPP Design Features

28 - 30 May, 2008 Riviera Holiday Club, Varna, Bulgaria

Jordan Georgiev BNPP Manager

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reContent

• Original BNPP Design• Advanced Design Features

– Main Equipment– Safety Features

• Highlights of Evaluation• Your Contacts

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Original BNPP Design

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reOriginal Design FeaturesSingle Wall Containment:-pre-stressed reinforced concrete-leak tight metal liner

DBA and BDBA Conditions:-Pressure – 0.5 MPa-Temperatire – 150 C

Reactor Type: WWER 1000/V320RPV Service Life 40 yearsActive SS: 3x100%(HP SIS, LP SIS, EFWS, UPS, DG, HVAC, SW)Passive ECCS: 4x50%

Features:ISFSPools, IRWST, DSI into RPV, ES/GRS

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Advanced Design Features

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reGeneral Data

Reactor type PWRPlant supplier ASE, AREVA NP, SiemensReactor thermal power 3012 MWElectric output 1060 MWCapacity factor 90 %Design Service Life 60 years

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reMain Equipment: RCS

Reactor type PWR Russian DesignVVER 1000/V 466

Reactor thermal power 3012 MWService Life 60 yearsLoops 4Core inlet temperature 291 CCore outlet temperature 321 CCoolant pressure 15.7 MPa

Features:

- Direct Safety Injection in RPV- Emergency Steam/Gas

Removal System-Lower core elevation relative

to the cold legs-Larger SG and

Pressurizer volume

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reMain Equipment: Core

FA Type Advansed with bow resistant skeleton

FA Number 163FR Number 312RCCA Number 121

Fuel material UO2

- Average enrichment 4.361% UO2

- Integrated burnable absorber 5% Gd2O3

Skeleton material- SG and GT Zr Alloy

FP burn up 66.6 MWd/kg UFR burn up 61.2 MWd/kg UAverage FA burn up 55.0 MWd/kg U

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reMain Equipment: TG

Turbine K-1000-60/3000Type HP+4xLPSpeed 3000 rev/minBypass 8*125 kg/s (62% of nom. power)

Generator TVV-1000-2UZRated output 1111 MVAVoltage 24 kVFrequency 50 Hz

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reElectrical Systems

Main Transformers 2x630 MVAVoltage 24/400 kV

Auxiliary Transformers 2x63 MVAVoltage 24/6.3 kV

Start up Transformers 2x63 MVAVoltage 110/6.3 kV

4x100%

2x100%

4x100%

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reMain Equipment: I&C Systems

Safety I&C4x100%

Normal Operation I&C4x100%

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reSafety Features

Safety Objectives – A two fold strategy:

1. Enhancement of the prevention level of the defense in depth safety concept, particularly to reduce significantly severe accident probability

2. Mitigation of severe accidents consequences up to and including core meltdown accidents

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reMain Safety Systems

Double Containment with Ventilation and Filtration

Passive Heat Removal System

Active ECCS Water Reserves inside the Containment (1910 m3)IRWST – 750 m3

Passive ECCS I – 4x50 m3

Passive ECCS II – 8x120 m3

Active SG Emergency Cooling and Blow down System

Passive Fast Boron Injection System under ATWS

Melted Core Catcher

Large water source in the IRWST, gravity draining into the corium retention area

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reContainment System

Primary Containment:-pre-stressed reinforced concrete-leak tight metal liner

Secondary Containment:-reinforced concrete-leak tight metal liner

DBA and BDBA Conditions:- Pressure – 0.5 MPa-Temperatire – 210 C

Containment Spray System:- Capacity 4x100%

Hydrogen Mitigation System:-154 Catalytic recombiners- Maximum hydrogen concentration in the long term – 0.56%- Local peak hydrogen concentration in any time in dry air condition – 1.8%

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reSevere Accident Management SystemsPassive Heat Removal System

-DHR up to 2 % of nominal power-Capacity 4x33%-Natural recirculation driven-Outside air cooling

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reSevere Accident Management System

Corium retention and cooling System

Capacity 1x100%

Strategy:-prevention of basemat concrete erosion-maintain containment integrity

Measures:-core catcher on basis of a melt retention concept-water cooling from top and bottom-water-supply from external sources provided

Result:-stabilization of melt on defined area-solidification of core melt within 3 to 5 days

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reSevere Accident Management SystemsPassive Annulus Filtering System-Convection driven by hot air-Purification Efficiency of filter unit

-Aerosols – 99.9%-Molecular Iodine – 99.9%-Organic Iodine – 99.0%

-Leak Purification Flow – up to 500 kg/h

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UCA

4

UCB

32

1

UJAUKC

UKA

Protection against External Hazards

Reactor building, Fuel building, Safety Systems Building, Main Control Room, Remote Shut down Building - protected against the impact by design

The DG Building 1, 2 and 3, 4 - protected against the impact by separation

Reinforced Concrete Protection

Protection by separation

Standard Protection

The APC protection approach shall be fulfilled by sufficient thick dimensioned outer building walls, separated from inner structures and other technical measures like physical separation

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reCriteria for Limited Impact

No Emergency Protection Action beyond 800 m No Long Term Action beyond 800 m

Limited economic impact No Delayed Action beyond 3

km

• Release Targets for Design Basis Category 3 and 4 Conditions

– no action beyond 800 m – limited economic impact

• Criteria for Limited Impact for Design Extended Conditions– no Emergency Protection Action /evacuation/ beyond 800 m– no Delayed Action /temporary relocation/ beyond 3 km– no Long Term Action /permanent resettlement/ beyond 800 m– limited economic impact

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reHighlights of Evaluation

0 50 100 150

V 320

V 466

%

0 50 100 150

V 320

V 466

%

0 50 100 150

V 320

V 466

%

V 466 Advanced Design vs V 320 Serial Design

0 50 100 150

V 320

V 466

%

Annual Electricity Production Annual Uranium Consumption

Annual Spent Fuel Generation Current Levelized Electricity Cost

+20%-24.5%

-50% -11%

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reHighlights of Evaluation

V 320

V 466

V 320

V 466

V 466 Advanced Design vs V 320 Serial Design

Core Damage Frequency Early Large Release Frequency

1.5E-07 5.5E-10

V 320 Serial Design V 466 Evolutionary Design

Reactor Protection System 1x100% 1x200%

Fast Boron Injection System - 4x25%

Safety Protection Systems including DG+UPS+I&C+HVAC+SW

3x100% 4x100%

Passive ECCS 4x50% 4x50%+4x33%

Passive Heat Removal System - 4x33%

Melted Core Retention and Cooling System

- 1x100%

1E-05 1E-06

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reDesign Certification

• VVER AES 92 Design has successfully passed all the steps of the analysis of compliance vs European Utility Requirements for LWR Plants for 1998-2006

• VVER AES 92 Design was certified in April 2007

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reConclusions

• Belene NPP design is based on proven and advanced technologies

• Evolutionary approach has been carefully selected:

• it is considered as the best approach for largepower plants

• it allows to benefit fully from operating experience

• it minimizes the risk for investors and operators

• Belene NPP safety is at the highest level

• Belene NPP provides efficient and friendly operating and maintenance conditions

• Belene NPP is designed to achieve high efficiency, high availability and low operating costs

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reYour Contacts