WESTINGHOUSE AP 1000 Featuring proven technology and innovative passive safety systems, the Westinghouse AP1000 pressurized water reactor can achieve competitive generation costs in the current electricity market without emitting harmful greenhouse gases and further harming the environment. Westinghouse Electric Company, the pioneer in nuclear energy once again sets a new industry standard with the AP1000. The AP1000 is a two-loop pressurized water reactor that uses simplified, innovative and effective approach to safety. With a gross power rating of 3415 megawatt thermal and a nominal net electrical output of 1117 megawatt electric, the AP1000 is ideal for new base load generation. The AP1000 is the safest and most economical nuclear power plant available in the worldwide commercial marketplace, and is the only Generation III+ reactor to receive a design certification from the U.S. Nuclear Regulatory Commission (NRC). Based on nearly 20 years of research and development, the AP1000 builds and improves upon the established technology of major components used in current Westinghouse-designed plants. These components, including steam generators, digital instrumentation and controls, fuel, pressurizers, and reactor vessels, are currently in use around the world and have years of proven, reliable operating experience. Historically, Westinghouse plant designs and technology have forged the cutting edge technology of nuclear plant around the world. Today, nearly 50 percent of the world’s 440 nuclear plants are based on Westinghouse technology. Westinghouse continues to be the nuclear industry’s global leader.

Convention SFEN 11 et 12 mars 2009 - Roger SCHENE

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The Westinghouse Advanced Passive Pressurized Water Reactor, AP1000TM

Roger SchèneDirector,Engineering Services

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The Origins of AP1000Design and Development

*AP1000TM Design Overview

– What is it ?

– How is it different ?

Key elements used in developing the AP1000 design

*AP1000 is a trademark of Westinghouse Electric Company LLC

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AP1000 Investment in Technology

US NRC Certified

Reduced Components and Commodities

PRA and Severe

Accident Mitigation

FeaturesShort Construction

Schedule

Modular Construction

Simplified Passive Safety

Systems Proven Advanced Design Features

TYPICAL 4 PLACES

CORE

WATER INLET

INSULATION

SHIELD WALL

REACTOR VESSEL

STEAM VENTSREACTOR VESSELSUPPORT STEEL

Extensive Testing of Passive Safety

Systems

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The Westinghouse AP1000A compact station

• 3415 MWt. Primary system• 1117 MWe• 2-loops, 2 steam generators

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AP1000 Features - Differences

Passive safety features

Plant simplification

Modular construction

Shortened engineering and construction schedule

The first and only Generation III+ reactor to receive

Design Certification from the U.S. NRC

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AP1000 Design OverviewFor the Power Generation Function, AP1000 is a typical Westinghouse PWR with advances in materials and components

- Fuel - Reactor Vessel- Reactor Coolant Loop - Steam Generators- Pumps - Turbine- Plant Controls

Reactor safety functions are achieved without using any safety-related AC power

- Battery Powered Valve Actuation - Condensation- Natural Circulation - Evaporation- Compressed gasses (nitrogen, air)

Actuation of Passive Safety Systems is by simple, reliable changes in valve positions. System performance has been proven by extensive testing approved by the NRC.

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AP1000 Design OverviewTypical PWR Support Systems exist as simplified systems located in non-safety related building structures

- Diesels - Instrument Air- Chilled Water - Hot Water ( heating)- Component Cooling - Essential Service Water- Spent Fuel Cooling - Residual Heat Removal- Diesel Support Systems - Startup Feedwater

(Fuel Oil, HVAC) (replaces Auxiliary Feedwater)There are no safety-related pumps in the plant and no safety-related ventilation systems.Severe Accident Scenarios are mitigated by In-Vessel Retention of the melted fuel. (The core is retained in a cooled reactor vessel)

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Familiar But Improved Reactor Coolant System

Canned motor pumps mounted in steam generator lower head– Eliminate RCP shaft seals

Larger pressurizer (2100 ft3)(eliminate PORV)Top-mounted, fixed in-core detectors (no BMI’s)All-welded core shroud (not bolted)Ring-forged reactor vessel (no longitudinal welds)

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Proven AP1000 Components

Fuel

South Texas 1&2, Doel 4, Tihange 3

Reactor Vessel Internals

Doel 4, Tihange 3 Control Rod Drive Mechanisms

Westinghouse plants worldwide

Large Model F steam generators

ANO-2, San Onofre, Waterford, Palo Verde

Pressurizer

70 Westinghouse plants worldwide

Canned motor reactor coolant pumps

Fossil boilers and other industrial applications (inverted canned motor pumps)

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Passive Core Cooling SystemSimple 2-loop reactor coolant system with canned motor pumps

Use of passive safety systems

No reliance on safety grade AC power

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Passive Core Cooling System at Work

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Passive Containment Cooling System

IRWST

PRHR HX

CMT

Accumulator

AP1000 ultimate heat sink is the atmosphere

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AP1000 In-vessel Retention CapabilityProvides Reliable Means of Cooling Damaged Core

– Based on Tests and analysis– Reviewed by U.S. NRC

In PRA Core Damage Sequences– Core debris retained inside reactor

vessel– Core heat transferred through RV

wall– Water in containment removes heat

from RV– Water can be drained from

IRWST into containment– RV insulation designed to

promote heat transfer– Passive containment cooling

transfers heat out of containment

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AP1000 Enhanced Shield BuildingPCS Water Storage Tank

(Remains unmodified)

Air Inlet Design Enhancements

Shield Building Roof Design Enhancements

Cylindrical Wall Design Enhancements

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Modular Construction Allows More To Be Done in Parallel Resulting in Shorter Construction Schedule

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Modules Designed into AP1000from the Beginning

Pump/Valve Module

Raceway Module Structural Module Depressurization Module

Module Type

Structural

Piping

Mechanical Equipment

Electrical Equipment

TOTAL

Number

122

154

55

11

342

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Simplification - Smaller Footprint

Evolutionary PWR AP1000

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AP1000: Simpler and SaferSafer design ( CMF=5x10-7)Increased operating margin, significantly reduced unplanned capability loss factorNo need for AC power for safety systems to operateNo operator action needed for 72 hours following eventShorter construction scheduleLower equipment and construction costsLess equipment to maintain

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AP1000 Satisfies EURAP1000 assessed against EUR, Rev. C, Volumes 1 & 2AP1000 Assessment detailed and through– Over 5000 requirements

assessedAssessment demonstrates AP1000 is a mature design and the level of compliance is highAP1000 can be deployed in Europe

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AP1000 – UK Generic Design Assessment (GDA)

Four Step Process with Increasing Levels of Scrutiny

Design andSafety CasePreparation

Step 1

FundamentalSafety

Overview

Step 2

OverallDesign Safety

Review

Step 3

DetailedDesign

Assessment

Step 4

Complete

Complete

October 2009 Mid-April 2011July 14, 2007

In Progress

Aug. 20, 2007 April 2008

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China ProjectSanmen Accomplished Key Project Milestones

Sanmen Unit 1 site excavation and

basemat work complete

First concrete pour late March 2009

Construction of Module

Factory at Sanmen Site

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New Designs Have to DeliverCost basis that can compete with other energy sources- High degree of certainty for schedule and cost- Reduced construction time and costIncreased levels of safetyEasier to operate and maintainStandardized plants

AP1000 can deliverCurrently delivering on contracts

for 4 units in China and 6 units in the US

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AP1000 Standard Design for International Application