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CANDU Design and Equipment Overview

AECL CANDU Supply Chain ForumSaskatoonNovember 30, 2010

Ian lovePrincipal Advisor to Vice PresidentProduct Development

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CANDU Power Reactor

Qinshan Phase III, China

CANFLEX Fuel Bundle

CANDU Reactor Face

CANDU Plant Design Schematic

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CANDU 6

• 700 MWe Class

• Eleven Reactors in Service

• Operated by six utilities on four continents

• Fleet Life-time Capacity Factor - 89%

Enhanced CANDU 6 (EC6) Design

Overview

• 740 MW(e) Classic CANDU reactor

• Natural Uranium (NU) Fuel

• Heavy water coolant and moderator

• 60-year plant life

Strengths

• Only proven medium sized reactor

• Proven high performer

• Outstanding construction record

• Unique fuel cycle capabilities

Two-unit EC6 plant and Calandria face

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EC6 Reference Plant Layout

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Reactor BuildingService Building

Turbine Building


MAJOR PLANT BUILDINGS

• NSP (Nuclear Steam Plant)– the Reactor Building (houses NSSS) and the Service

Building (houses BNSP)

• BOP (Balance of Plant) –Conventional Systems (steam, water, electrical) and the

Turbine/Generator are housed in the Turbine and Auxiliary Buildings

Reactor Building

Service Building

Turbine Building

• Plant Layout is based on 3 main parts:

EC6 Major NSP Systems & Equipment

–Plant Layout–Reactor Equipment–Moderator Equipment–Heat Transport System/Equipment–Fuel–Fuel Handling System/Equipment–Major NSP Heat Exchangers–Major NSP Pumps–Major Pressure Vessels & Tanks–Major NSP Valves–Civil Equipment & Modules

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Codes and Standards

• The Canadian Standards Association (CSA) N285.0 codes specifies requirements for manufacturing of CANDU Nuclear Power Plants pressure-retaining systems and components in Canada.

o CSA N285.0 Class 1 ASME Section III Class 1



o CSA N285.0 Class 6 ASME Section VIII / ANSI B51 Piping

• The supplier’s quality assurance (QA) program needs to meet the requirements of ISO 9001-2000. The suppliers shall also comply with the other quality assurance requirements specified in the equipment tender documents.

Major NSP Components / Equipment


Civil• Structural Steel – CSA Standard• Stairwells – CSA Standard• Platforms - CSA Standard

Mechanical Equipment• Calandria - Nuclear• Fuel Channels - Nuclear• Reactivity Mechanisms - Nuclear• Fuelling Machines – Nuclear/Non Nuclear• FH Transfer Equipment - Nuclear/Non Nuclear


Major NSP Component / Equipment

Process Equipment• Heat Exchangers – Nuclear/Non Nuclear• Pumps - Nuclear/Non Nuclear• Pressure Vessels – Nuclear/Non Nuclear• Piping & Fittings - Nuclear/Non Nuclear• Valves - Nuclear/Non Nuclear

Electrical & I&C• Electrical & Control Cables – IEEE/CSA Standards• Cable Trays - IEEE/CSA Standards• Pressure/Temperature Instrumentation - IEEE/CSA Standards• Process Controllers etc. - IEEE/CSA StandardsModules• Civil Modules• Equipment and Piping Modules


CANDU 6 REACTOR ASSEMBLY

• Low pressure and low temperature Calandria houses reactor assembly

• Calandria is set in a light water-filled, concrete, shielding vault

• Fuel channels and moderator are contained in Calandria

• End-shields are filled with light water and steel balls

1 CALANDRIA2 CALANDRIA END SHIELD3 SHUT-OFF AND CONTROL RODS4 POISON INJECTION5 FUEL CHANNEL ASSEMBLIES6 FEEDER PIPES7 VAULT


EC6 MAJOR REACTOR EQUIPMENT LIST

Description Qty Code Class

Material Size

Calandria Shell / End Shield Assemblies

1/2 CSA N285.0 Class 3

SA240SS 304L Plate

7.82m L x 7.65m OD x 28.6mm Thk

Pressure Tube 380 CSA N285.0 Zr-2.5wt%Nb alloy 103.4mm ID x 4.9mm Thk

Calandria Tubes 380 N285.0 & ASME Sect III

Zirconium Alloy Grade R60804

131.9mm ID x 1.5mm Thk

End Fitting Assembly 760 CSA N285.0 Modified Type SS 403

2.36m L

Reactivity Mechanism Deck

1 CSA N285.0 Class 6

CS top & bottom filled with Concrete

6.8m L x 5.9m W x 1.2m Depth


CALANDRIA / FUEL CHANNELS

Moderator System

Reactor Coolant


CANDU 6 Calandria Assembly

Calandria Shell

Welding End Shield to Shell

End Shield


CANDU 6 FUEL CHANNEL ASSEMBLY


CANDU 6 End Fitting


CANDU 6 Pressure Tubes


CANDU 6 Calandria Tubes


CANDU 6 REACTIVITY DECK

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Moderator Heat Exchanger

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HEAT TRANSPORT SYSTEM (Reactor Coolant System)

• EC6 HTS:–2 loops, carbon

steel –4 coolant pumps, –4 steam generators

• Design: –outlet pressure 10

MPa,–Outlet temperature

3160C

• All HTS equipment specified as Class 1

Steam Generators

HT Pumps

Headers

Feeders


EC6 Major HTS EquipmentDescription Qty Code

ClassMaterial Size

Steam Generators 4 Class 1 Tube – Incoloy 800Shell – CS

508 MW(th) ea.

HT Pumps – Vertical, centrifugal, single suction, double discharge

4 Class 1 Pump Casing – CSOthers: See TS

2228 L/s @ 215 m

HT Pump Motor – AC, Vertical, squirrel cage induction

4 Class 1 See TS 6.7 MWe

Reactor Inlet/Outlet Headers 4 Class 1 ASME SA106 Gr B 370 mm ID

Feeders 760 Class 1 ASME SA106 Gr B 1 ½ “ to 3” Sch 80

HT Piping TBC Class 1 ASME SA106 Gr B !8” and 20” Sch 100

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Steam Generator Lift



Feeder Header Module

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Feeders – in shop



Description Qty Type Code Class Size

Moderator Heat Exchangers 2 Vertical U Tube-in-Shell

Class 3 & 6 50 MW(th)

HT Purification Interchanger 1 Tube-in-Shell Class 1 50 MW(th)

HT Purification Cooler 1 Tube-in-Shell Class 3 & 6 12.8 MW(th)

Degasser Cooler 1 Horizontal U Tube-in-Shell

Class 6 2.4 MW(th) (Normal) / 11.8 MW (th) (HT Degassing

ECC Heat Exchangers 4 Shell & Tube Class 2 & 6

EC6 Major NSP Heat Exchangers


Description Qty Type Code Class

Size

Moderator Pumps 2 Vertical, single stage double-suction centrifugal

Class 3 Flow – 1588L/sHead – 55m

Moderator Pump Motor 2 3-Phase, squirrel cage induction motor

Class IV 60Hz, 4KV, 1200KW, 890RPM

HT Pressurizing Pumps 2 Multi-stage horizontal centrifugal

Class 6 Flow – 16.7L/sHead – 1650m

Shield Cooling Pumps 2 Centrifugal Class 2 Flow – 400L/sHead –63m

ECC Pumps 4 Vertical, Centrifugal Class 2 TBC

RCW Water Pumps 4 Horizontal, centrifugal Split Case

Class 6 Flow – 720L/sHead – 61m

EC6 Major NSP Pumps


Description Qty Type Code Class

Size

Main Steam Isolation Valves (MV)

4 600 lb Gate Class 2 24”

Main Steam Relief Valves (RV)

12 600 lb Flanged– Spring Loaded,Pneumatic Actuator

Class 2 Inlet 10”Outlet 14”

Power Operated Relief Valves (PCV)

4 600 lb Globe, Pneumatic

Class 2 TBC

Valves >4,600 Gate, Globe, Ball, Butterfly, Check, Relief etc.

Class 1, 2, 3 & 6

Various¼” to 36”

Control Valves >1,000 FCV, PCV, PRV, PV, LCV, TCV

Class 1, 2, 3 & 6

Various

EC6 Major NSP Valves

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Typical Valve Station Module



CANDU 6 SPENT FUEL POOL


SPENT FUEL BASKET / STORAGE FRAME

•28 Baskets / Storage Frame

•78 Storage Frames (13x6 Array) in Spent Fuel Storage Bay

•36 bundles / basket


SPENT FUEL DRY STORAGE MACSTOR – 200


EC6 Balance of Plant

Balance of Plant (BOP) equipment is located in Turbine Building & Auxiliary Structures. It includes:

• Turbine Generator Set & Condenser• Main Feedwater / Main Steam Systems outside of RB• Feedwater Heating & Condensing Systems • Electrical Systems• Recirculating Cooling Water / Raw Service Water

Systems• Various Auxiliary Systems & Equipment

Code Class – CSA N285.0 Class 6 Code – ASME Section VIII / ANSI B51 Piping (Non Nuclear)


QINSHAN TURBINE GENERATOR


FEEDWATER AND MAIN STEAM SYSTEM


FEEDWATER HEATING / CONDENSING SYSTEM


ELECTRIC POWER SYSTEM

• For power production related functions–On start-up, station services fed from Station Service

Transformers (SST).–After synchronization some loads supplied by Unit

Service Transformers (UST).

• For station support functions–4 power classes (class IV, class III, class II, and class I)–4 class III diesel generators, two per unit–4 x100% EPS diesel generators - two per unit (for

Group 2 loads)


CANDU ELECTRIC POWER SYSTEM

CANDU 6 CONSTRUCTION



Qinshan Project Lifecycle Phases


Qinshan Construction Method


View of Qinshan Site During Construction


Calandria being moved into the RB


Qinshan - Dousing System Modules


Modularization Construction Templates at Qinshan


Open Top / Partially Modular Construction – Qinshan

• Logic improvements• Steam generators installed in

eight hours• One month saved not waiting for

inner dome formwork• Dousing system steelwork &

piping installed in prefabricated segments

Unit 1: 6 weeks early

Unit 2: 4 months early


Completed Qinshan Site – 2 Unit CANDU 6

Darlington RefurbishmentFour unit CANDU plant – 3400 MW

• Replace 4 x 480 pressure tubes and feeders• Turbine-generator set upgrades• Replace / upgrade various reactor components• Refurbishment waste management• Project infrastructure facilities

–civil, mechanical, electrical systems

• Ontario Power Generation and other major contractors will let many contracts for equipment and service packages



Summary

• Equipment design / supply comprises about 50% of the total CANDU project costs split between NSP & BOP

• Much of the BOP equipment for CANDU units is similar to that of coal burning generating plants

• Nuclear equipment is often unique and specialized but business potential could be high

• Next presentation will outline the process to become a “Qualified CANDU Supplier”

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Do you have any questions?

Questions


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