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Answers for energy.

Conventional islands

from SiemensLeading the way in profitability and reliability

Reprint from Nuclear Technology International, January/February 2009

Author:

Siemens AG



The outstanding reliability of Siemens steam turbines

proven over many decades, the minimal servicing

and maintenance effort required and the turbines’

cutting edge in efficiency and performance represent the

utmost safety and profitability of power generation plants

made by Siemens.

RENAISSANCE OF NUCLEAR POWER

Against the backdrop of a rapidly increasing electricity

demand and concerns about climate change and surgingprices for fossil fuels, the question arises as to how we can

ensure a reliable, and yet environmentally benign and climate-

compatible, and, at the same time, affordable power supply

going forward. The answer is that we need all energy resources

and all power generation technologies that are available. This

applies to natural gas and coal, as well as renewable energy

sources. Nuclear power is also an attractive option and is

currently undergoing a worldwide renaissance.

SIEMENS – A COMPOTENT AND EXPERIENCED

SUPPLIER OF CONVENTIONAL ISLANDS

In addition to unconditional safety, operators expect aboveall reliability and optimum efficiency from their power plants.

This implies that there are three basic requirements of

conventional island suppliers:

1.Perfect harmonisation of the interfaces between the nuclear

island and the conventional island.

2.Reliable and proven technology with maximum efficiencies

thanks to cutting-edge engineering.

3.Service-friendliness coupled with many years of experience.

In all three points, Siemens sets the global benchmark and

provides customised solutions for conventional islands based

on Siemens' standard design.

PERFECT HARMONISATION OF THE INTERFACES

BETWEEN THE NUCLEAR PLANT AND THE

CONVENTIONAL ISLAND

Siemens has recent experience with turnkey construction of

the conventional island of nuclear plants and is familiar with

all of the interfaces to the nuclear part of the plant.

Some of the best nuclear power plants in the world are not

only equipped with conventional islands from Siemens, but

were built by Siemens as part of turnkey power plantprojects. With a total installed capacity of more than 600 GW,

Siemens Energy is the world's leading supplier of steam

turbine-generator units. Siemens places this long-standing

experience at the disposal of its joint venture with AREVA NP,

in which it holds a 34% stake. Siemens draws upon its

experience as a turnkey constructor of turnkey power plants

to ensure a perfect link-up with the nuclear island

of the plant.

Siemens Energy is currently constructing the conventional

island of the Olkiluoto 3 nuclear power plant (OL3) turnkey,

incorporating what will be the biggest turbine-generator

unit ever built anywhere in the world. In addition,Siemens is supplying the electrical and instrumentation &

control systems.

The experience Siemens is gaining from this project

extends and strengthens our field service know-how of large

steam turbines and generators, and will benefit future

nuclear power plant projects. OL3 is a European Pressurised

Reactor (EPR) nuclear power plant of the Generation 3 plus.

OL3 will not only be the most powerful nuclear power plant

in the world with a rating of approximately 1,600 MW, but is

also expected to set new standards in terms of safety

with a number of new and additional active and

passive safeguards.

CONVENTIONAL

ISLANDS FROM SIEMENS

– LEADING THE WAY IN PROFITABILITY AND

RELIABILITY

Siemens AG

With the company’s expertise and long years of experience in the construction of turnkey nuclear and coal-fired power plants, Siemens can respond to its customers' requirements like no other provider of conventional islands for nuclear power plants – from individual components to the complete steam

turbine-generator set to a turnkey conventional island, including all of the instrumentation and control systems necessary for closed and open-loop control of the complex processes.

90

Operational Issues



RELIABLE AND PROVEN TECHNOLOGY WITH MAXIMUM

EFFICIENCIES

CUTTING EDGE STEAM TURBINE TECHNOLOGY

The 1,600-MW steam turbine-generator unit for Olkiluoto 3 is

the first of a new rating class. Based on the experience gained

from ongoing upgrade projects and specific design features,

the 6-flow low-pressure turbine is expected to achieve record

efficiency. Moreover, Siemens is the only manufacturer

worldwide to have truly mastered the shrink-fit manufacturing

process. This makes the steam turbine particularly resistant to

stress corrosion cracking. Siemens steam turbines also

incorporate a number of other features to avoid stress corrosion

cracking, including the use of specially selected steel, optimised

forging processes, stress-limiting design and fabricationprocedures, special surface treatment to further reduce tensile

stresses, extensive quality assurance measures and monitoring

of steam purity.

The design of this machine is based on the standardised

and proven turbine-generator developed by Siemens for the

Konvoi series of nuclear power plants in Germany, including

the Isar 2 unit with a rating of approximately 1,500 MW.

Siemens has now advanced this proven technology to an

even higher level of efficiency and output. The efficiency

improvement of the high-pressure turbine was achieved by

using 3DV™ blades, which already have an excellent service

record in conventional steam turbine power plants, and by

tailoring the blade profiles, featuring optimised reaction for

each individual turbine stage.

The efficiency improvement of the low-pressure turbines was

achieved mainly by enlarging the annulus exit area. The

advanced 3D final-stage blades needed for this have a twisted

profile that varies the reaction along the length of the blade in

line with the rotational velocity, which increases exponentially

along the length of the blade.

To protect the blades against droplet erosion, their leading

edges are flame- or laser-hardened, while the geometry of the

flow channel is specially designed to keep any droplets forming

away from the rotor blades.

Siemens steam turbines for nuclear power plants have beensetting global standards in terms of output, efficiency, service-

friendliness and reliability for decades. That is why nuclear

power plants equipped with Siemens steam turbines have

consistently occupied top places in worldwide ranking lists for

their power generation for many years. Siemens steam turbines’

availability figures are approximately 98%.

SERVICE-FRIENDLINESS COUPLED WITH MANY YEARS OF

EXPERIENCE

The steam turbines built by Siemens Energy have set global

standards not only in output and efficiency, and in reliability and

service-friendliness. The design of Siemens turbines for nuclear

Olkiluoto 3: A next-generation European Pressurised Reactor (EPR)-type nuclear power plant. Siemens is supplying theturnkey conventional island

91

Operational Issues



power plants has earned a proven service record over many

decades. The shrink-fitted wheel disks do not show any signsof stress corrosion cracking even in millions of cumulative

operating hours.

In recognition of these excellent results, the US Nuclear

Regulatory Commission (NRC) has authorised Siemens

steam turbines for inspection intervals of 100,000 operating

hours. Additionally, inspection of the individual components

can be scheduled with several of the annual refuelling

outages required for a nuclear power plant. Siemens'

competent and experienced service teams carry out these

modular inspections without adding to the downtimes

already scheduled for refuelling and other inspection work

on the nuclear island. These modular, annual turbineinspections can help eliminate time-consuming, full-scale

overhauls. Both result in significant cost savings for the

plant operator. Not to mention that with service locations in

all regions of the world, Siemens is always close by to assist

customers with their service needs.

STRATEGIC COOPERATION ARRANGEMENTS

E.ON, AREVA NP and Siemens have signed a declaration

of intent providing for the long-term cooperation in the

construction of additional EPR-type nuclear power plants,

which E.ON wants to build and operate. These long-term

cooperation arrangements and the valuable experience

currently being gained from the construction of the Olkiluoto

3 power plant are the ideal prerequisites for optimumcooperation in the construction of future nuclear power

plants. The declaration of intent also includes cooperation in

the development of a SWR1000-type boiling water reactor,

to which Siemens will provide the conventional part.

Siemens has decades of experience in building boiling

water reactors.

Siemens is prepared to put its experience with

conventional islands at the disposal of other suppliers of

nuclear power plants as well. Based on the excellent

operating results achieved by Siemens steam turbines in the

conventional islands of nuclear power plants and on the

experience being gained from the Olkiluoto 3 project,additional improvements will be incorporated into future

applications of turbine-generator units and turnkey

conventional islands.

SUMMARY

Decades of comprehensive experience as the supplier of the

world's largest steam turbine fleet and as the builder of turnkey

nuclear plants that are among the best in the world, make

Siemens Energy a competent partner for suppliers of nuclear

islands for nuclear power plants. Siemens’ cutting-edge and

proven design of the conventional island can help increase the

reliability of any plant and decrease operating costs. ■

92

Operational Issues

On the right hand side low-pressure turbine for the Olkiluoto 3 project



www.siemens.com/energy

This article appeared in:

Nuclear Technology International

January/February 2009, Pages 90 – 92

Copyright © 2009 by

Nuclear Technology International

This reprint is published by:

Siemens AG

Energy Sector

Freyeslebenstrasse 1

91058 Erlangen, Germany

Siemens Energy, Inc.

4400 Alafaya Trail

Orlando, FL 32826-2399, USA

For more information, please contact

our Customer Support Center.

Phone: +49 180/524 70 00

Fax: +49 180/524 24 71(Charges depending on provider)

E-mail: [email protected]

Order No. E50001-G220-A120-X-4A00

Printed in Germany

Dispo 05400 c4bs No. 7810

TH 224-090297 430097 SD 04092.0

Printed on elementary chlorine-free bleached paper.

All rights reserved.

Trademarks mentioned in this document

are the property of Siemens AG, its affiliates,

or their respective owners.

Subject to change without prior notice.

The information in this document contains generaldescriptions of the technical options available, which

may not apply in all cases. The required technical

options should therefore be specified in the contract.

conventional islands from siemens

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