CFD

activitiesatEDFEnergyR&D

UK

Centre.

Juan

Uribe1

1EDFEnergy,

R&D

UK

Cen

tre

ModellingandSim

ulationCen

tre

April2nd,2014

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

1/22

Outline

1Introduction

2Currentprojects

involvingCFD

3Hot

Box

Dom

e

4Podboilers

modelling

5Flow

alon

gfuel

pins

6Steam

penetration

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

2/22

EDFEnergy:

United

Kingdom

Generation

Nuclear:

safety

review

andreinforcem

ent.

New

nuclear:

authorizationforpreparatoryworks

atHinkley

Point.

Salesandmarketing

5.8

millioncustomers

Electricity:52.8

TW

hsold

Gas:25.7

TW

hsold

Results

Sales

contribution

:e8.6

billion

GroupEBITDA

contribution

:e1.9

billion

Employees:15,536

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

3/22

RoleoftheR&D

UK

Centre

Creatingvaluetodayandpreparingfortomorrow

Agrowingpresence

intheUK’sR&D

andInnovationagenda

Deliver

R&D

intheUK.

Opportunitiesin

thepositiveUK

environment.

CollaborationwithEDFGroupandR&D

France.

Thecore

ActivitiesofR&D

UK

centre

TosupportEDFEnergy

initsbusinessandcommercial

activities.

Tolead

R&D

activities

inUK

forEDFgrou

pthat

will

benefitfrom

theUK’sencouragingenvironmentanditsstrongexperience.

Tocontribute

totheInternational

NuclearDevelop

ment,supporting

thelifetim

eextensionof

existingnuclearin

UK

andto

providethe

R&D

supportforthenuclearnew

build

agenda.

Tocontribute

totherevivalof

specificskillsandcompetencesfor

energy

research

intheUK

andallow

EDFGroupto

benefitfrom

the

scientificexcellence

ofkeyUK

research

centres.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

4/22

Partnerships

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

5/22

UK

Context

fornuclearenergy

Nuclearpow

erwill

needto

playan

importantrole

insupportof

asustainable

decarbon

ised

electricity

generationsystem

intheUK.

Thisou

tlines

theneedforbothnew

nuclearbuild

andlifeextension

ofthe

existingop

eratingnuclearstations.

Lifeextension

will

requireR&D

toaddress

thetechnical,scientificand

engineeringchallengesthat

itwill

present.

R&D

iskeyto

attractingand

maintainingthehighlevelskillsneeded

tosupportop

erationsnow

andnuclear

over

thelongterm

.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

6/22

NuclearGenerationChallenges

R&D

roadmapthem

es

ImprovePlantPerform

ance.

UnderstandPlantCondition.

Improved

Modelling.

Skills.

For

R&D

thefocusisarou

ndlifetim

esupportingtheAGRsandSZB.

Technical

lifetim

eforbothwill

bedetermined

bythenon-replaceable

compon

ents

that

degradethrough

use.

Toachieve

therigh

tlifetim

erelateddecisionsitisnecessary

tohave

thecorrectunderlyingtechnical

understandingandkn

owledge.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

7/22

CurrentprojectsusingCFD

R&D

UK

CentreCFD

projects:

Projectson

thegasflow

son

AdvancedGas-cooled

reactors

(AGRs)

1Hot

Box

Dome,

upper

plenum.

⑥ 1

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

8/22

CurrentprojectsusingCFD

R&D

UK

CentreCFD

projects:

Projectson

thegasflow

son

AdvancedGas-cooled

reactors

(AGRs)

1Hot

Box

Dome,

upper

plenum.

2PodBoilers.

⑥ 1

⑥ 2

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

8/22

CurrentprojectsusingCFD

R&D

UK

CentreCFD

projects:

Projectson

thegasflow

son

AdvancedGas-cooled

reactors

(AGRs)

1Hot

Box

Dome,

upper

plenum.

2PodBoilers.

3Flow

alon

gnuclearfuel

rods.

⑥ 1

⑥ 2

⑥ 3

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

8/22

CurrentprojectsusingCFD

R&D

UK

CentreCFD

projects:

Projectson

thegasflow

son

AdvancedGas-cooled

reactors

(AGRs)

1Hot

Box

Dome,

upper

plenum.

2PodBoilers.

3Flow

alon

gnuclearfuel

rods.

4Steam

penetration

.

⑥ 1

⑥ 4

⑥ 2

⑥ 3

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

8/22

HotBoxDome-upper

plenum

TheHot

Box

Dom

eisasteelstructure

that

separated

thehotgas

(T2)

from

thecold

gas(T

1)surrou

ndingthecore.Itisavery

important

compon

entanditstemperature

must

bemon

itored

toensure

compliance.

Toachieve

lower

temperatures,holes

weredrilledin

thecentral

control

rodgu

idetubeof

thereactors.

Themodification

had

another

effect:

increase

insulation

effect

ontheupper

partofthedom

e.

Butthiscould

not

be

controlled.Itwas

producedby

theequilibrium

betweentwo

jets

inwhichmanyfactorsare

important(tem

perature,

turbulence

levels,etc).

Anew

modification

was

prop

osed

inorder

toenhanced

theeff

ectof

thecold

jet.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

9/22

HotBoxDome-upper

plenum

Modified

flow

Deflection

ofthecold

jetby

the

hot

gascomingfrom

the

pepper

pot

holes,witha

separationpointaround2.65m

Large

recirculation

zone.

Highlevelof

unsteadiness.

Coolingof

thecentral

dom

eregion

dueto

theim

pingement

ofthedeflectedjet.

Stron

gmixingafterthefirst

row

offuellinggu

idetubes,

away

from

thedome.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

10/22

HotBoxDome-upper

plenum

Itwas

prop

osed

toinstallaflow

redirection

device(cow

l)in

order

tokeep

thecold

gascloser

tothesurfaceof

thedom

e.CFD

was

usedto

analyse

theeff

ectof

severalpossible

shap

es.

Therearetwotypes

ofshap

esconsidered:

Curved

cowl(typ

eA)Characterisedby

3points

that

makeupthe

arc(11in

total).

Flatcowl(typ

eB)Characterisedby

attachmentpoint,angleand

length(8

intotal).

AB

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

11/22

HotBoxDome-upper

plenum

Itwas

prop

osed

toinstallaflow

redirection

device(cow

l)in

order

tokeep

thecold

gascloser

tothesurfaceof

thedom

e.CFD

was

usedto

analyse

theeff

ectof

severalpossible

shap

es.

Therearetwotypes

ofshap

esconsidered:

Curved

cowl(typ

eA)Characterisedby

3points

that

makeupthe

arc(11in

total).

Flatcowl(typ

eB)Characterisedby

attachmentpoint,angleand

length(8

intotal).

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

11/22

HotBoxDome-Upper

plenum

CouplingwithSYRTHES

Once

thedesigned

was

agreed,the

thermal

stresses

needed

tobe

computed.

Model

ofthecentral

control

rodgu

ide

tubeandcowlin

SYRTHES.

Evaluationofthetemperature

inside

thetubewall.

Stressanalysisyielded

highstresses

atthejunctionso

new

profi

ledesigned.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

12/22

PodBoilers

Theboilers

atHeysham

andHartlepool

areadifferentdesign(helical)

from

theother

reactors

(serpentine).

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

13/22

PodBoilers

Theboilers

atHeysham

andHartlepool

areadifferentdesign(helical)

from

theother

reactors

(serpentine).

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

13/22

PodBoilers

Poddesignismorecompact.

Gas

flow

pathvery

complex.

Originally

was

supposed

tobereplaceable,butdueto

prob

lemsduringconstruction,itisnow

sealed

under

concrete.

Water

tubes

aremadeof

3differenttypes

ofsteel,

accordingto

thestateof

water

inside.

Tem

perature

atthejoints

ofdifferentmetalsisa

limitingfactor.

Major

issues:oxidation(w

ater

andCO

2)andcreep.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

14/22

PodBoilers

Currentapproach

2Dmodellingof

boilerregion

sbased

onconservationofenergyand

mom

entum

(q=

m∆h,ρUA

∼∆p).

Based

onexperim

entalcorrelationsfrom

rigin

the70’s.

Usesplantt/creadings

toadjust

geom

etricalparam

etersandthen

predictjointtemperatures.

CFD

model

Full3D

.

Com

pon

ents

correlationsdetermined

byfinesub-m

odels.

Cou

pledwithNUMEL(N

Gcodeforwater

side).

Turbulence

andcrossflow

explicitly

computed.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

15/22

Podboilers

Boiler

Components

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

16/22

R&D

UK

CApr2014

1

Podboilers

Boiler

Components

1HPboiler.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

16/22

Podboilers

Boiler

Components

1HPboiler.

2Interbank.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

16/22

Podboilers

Boiler

Components

1HPboiler.

2Interbank.

3Reheater.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

16/22

Podboilers

Boiler

Components

1HPboiler.

2Interbank.

3Reheater.

4Inlet.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

16/22

Podboilers

Boiler

Components

1HPboiler.

2Interbank.

3Reheater.

4Inlet.

5Top

gasbaffl

e.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

16/22

Podboilers

Boiler

Components

1HPboiler.

2Interbank.

3Reheater.

4Inlet.

5Top

gasbaffl

e.

Project

objectives

Createa3D

porou

smodel

coupledwithNG’ssystem

code.

Ability

to“blank”

tubes

and

obtain

3Deff

ects

(non

-equilibrium).

Predictspinetemperatures.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

16/22

Fuelpins

Gas

flow

salon

gthefuel

assembly.

Thepinsarefinned

inorder

toincrease

heattransfer.

CO

2reacts

withthesteeland

producescarbon

deposition.

Depositsfillribsgapsandlower

heattransfer.

Fuel

rodsheatandbreak

needingreplacement.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

17/22

Fuelpins

Validationagainst

experim

ents

forasinglepin.

Model

ofthe120o

section.

Com

pute

heattransfer

fora

range

ofvalues

forthecarbon

depositionconductivity.

.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

18/22

Steam

penetration

Weldsin

thereheaterou

tlet

penetration

R21

D2of

DungenessB

pow

erstationhavebeensubject

toreheatcracking:

⇒needof

abetterunderstandingof

thetemperature

field.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

19/22

Steam

penetration

15solids:

liner,insulation

...

1fluid,theairbox.

1porou

smedium,thebob

bin.

2coupledcodes:

CodeSaturne.

SYRTHES.

Con

vective,

conductiveand

radiative

heattransfer.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

20/22

Steam

penetration

Com

plexinteractionbetween

thefluid

andthesolid.

Bob

bin

modellingcrucial

but

not

much

iskn

ownab

outit.

Several

param

etersneedto

be

studied.

J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

21/22

�

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J.Uribe

(R&D

UK

Cen

tre)

CFD

activitiesatEDFEnergyR&D

UK

Cen

tre.

Apr2014

22/22