westinghouse ap 1000...westinghouse ap 1000 featuring proven technology and innovative passive...
TRANSCRIPT
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
1
The Westinghouse Advanced Passive Pressurized Water Reactor, AP1000TM
Roger SchèneDirector,Engineering Services
2
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
3
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
4
The Westinghouse AP1000A compact station
• 3415 MWt. Primary system• 1117 MWe• 2-loops, 2 steam generators
5
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
6
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.
7
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)
8
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)
9
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)
10
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
11
Passive Core Cooling System at Work
12
Passive Containment Cooling System
IRWST
PRHR HX
CMT
Accumulator
AP1000 ultimate heat sink is the atmosphere
13
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
14
AP1000 Enhanced Shield BuildingPCS Water Storage Tank
(Remains unmodified)
Air Inlet Design Enhancements
Shield Building Roof Design Enhancements
Cylindrical Wall Design Enhancements
15
Modular Construction Allows More To Be Done in Parallel Resulting in Shorter Construction Schedule
16
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
17
Simplification - Smaller Footprint
Evolutionary PWR AP1000
18
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
19
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
20
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
21
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
22
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
23
AP1000 Standard Design for International Application