Titolo presentazione - ENEA€¦ · CeSNEF-Nuclear Engineering division HISTORIA MAGISTRA VITAE TECNOLOGIE NUCLEARI INNOVATIVE: ... – Implements engineering innovations, new solutions,

IAEA TCEM K.A.CARE, Riyadh

2017.nov.19-23 Fare clic per modificare lo stile del titolo

prof. Marco E. Ricotti GNReactors

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Titolo presentazione sottotitolo

Milano, XX mese 20XX Prof. Marco E. Ricotti Politecnico di Milano, Dept. of Energy CeSNEF-Nuclear Engineering division

HISTORIAMAGISTRAVITAETECNOLOGIENUCLEARIINNOVATIVE:

IREATTORISMRPROSPETTIVEDIUTILIZZO

ENEA,Roma,2018maggio17

3 Storie di SMR Italiani: Il reattore IRIS




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uclearprof. Marco E. Ricotti G

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ENEA, Roma 2018.mag.17 The IRIS experience: main reference

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ENEA, Roma 2018.mag.17 The IRIS experience

–  Growing interest on the project: at 2009, 20 partners from 10 countries –  Key italian contribution –  2010: Westinghouse dropped; today: activity to support large scale testing (SIET labs)

Westinghouse,MIT,OakRidgeNat.Lab.(UCBerkeley)

AnsaldoNucleare,PolitecnicodiMilano,Univ.diPisa,PolitecnicodiTorino,ENEA,MangiarottiNuclear,MaireTecnimont,ATBRivaCalzoni,SAIPEM(ENI)

RollsRoyce

CNENresearchcenter,NUCLEPIndustries

ENSAIndustries,EmpresariosAgrupados

Univ.ofZagreb

TokyoInst.ofTechnology

LithuanianEnergyInstitute

ININresearchcenter

EESTIEnergia

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ENEA, Roma 2018.mag.17 The IRIS experience: original team and assignments

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ENEA, Roma 2018.mag.17 Up to 2009-2010: IRIS as reference SMR Design in

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ENEA, Roma 2018.mag.17 The IRIS approach

–  Driven by simplicity to ensure safety and economy

–  Uses proven light water technology

–  Implements engineering innovations, new solutions, but does not require new/breakthrough technology development

SAFETY ECONOMY

SIMPLICITY

Safety-by-Design™




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ENEA, Roma 2018.mag.17 IRIS Design Features

§  Integral PWR module 335 MWe, Safety-by-DesignTM approach

§  Long Life Core (~4 years, no maintenance outage within it)

§  8 helical-coil steam generators (compressed tubes, no crud: no Stress Corrosion Cracking)

§  8 axial flow fully immersed primary coolant pumps (low ΔP, no leakages, no maintenance, self-cooled, already used at 500°C in chemical industry)

§  Internal Control Rod Drive Mechanisms (no penetrations/leakages, no Rod Ejection Accident)

§  Integral Pressurizer (high prz volume / reactor power ratio, no sprays)

§  CDF 10-8 event/r y (internal+seismic)

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ENEA, Roma 2018.mag.17 IRIS: Containment Vessel integrated into Safety

Strategy 8

§  Pressure Suppression Containment, spherical, steel, 25 m diam.

§  Design Pressure 15 bar (rel.)

§  Suppression Pool limit peak pressure to 9 bar (rel.); water injection by gravity in case of LOCA

§  Self-limiting LOCA due to containment-RPV pressure equalization

§  Heat-sink: external air cooling of steel shell rejects heat to atmosphere

§  Auxiliary building seismically isolated

§  Containment Vessel and Safet Systems: international patent Westinghouse-POLIMI




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ENEA, Roma 2018.mag.17 9

AUX. T.B.BLDG.

Main Steam Line (1 of 4)Isolation Valves

Main Feed Line (1 of 4)Isolation Valves

SGMake

upTank

P/H P/H

P/H P/H

EHRS Heat Exchanger Refueling Water Storage

Tank (1 of 1)

Start Up FeedWater

Steam Generator(1 of 8)

FO FO

SuppressionPool (1 0f 6)

ADS/PORV(1 of 1)

Long Term Core Makeupfrom RV Cavity

(1 of 2)

RCP(1 of 8)

SG Steam Lines(2 of 8)

SG FeedWater Lines

(2 of 8)

FO FO

SafetyValve

SafetyValve

RV Cavity

SuppressionPool Gas

Space

IntegralReactorVessel

Emergency Heat RemovalSystem (EHRS)

1 of 4 Subsystems

DVI

EBT(1 0f 2)

IRIS: Safety systems

LTCS

Long term cooling system (LTCS)

EBT

Emergency boration tanks (EBTs) with direct vessel injection (DVI)

ADS

Small automatic depressurization system (ADS)

PSS

Containment pressure suppression system (PSS)

EHRS

Passive emergency heat removal system (EHRS)




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ENEA, Roma 2018.mag.17

Radial fast neutron flux profile

LOOP PWRs

IRIS

IRIS “innovations”: Pressure Vessel Embrittlement practically eliminated

§  SG modules è Downcomer water thickness (core-vessel): 1.7 m

§  Fast n flux on vessel: ~105 times less than in current PWRs → “Cold vessel”

§  External dose practically avoided

§  No embrittlement, no surveillance

§  “Aeternal” Vessel

§  Decommissioning simplified




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ENEA, Roma 2018.mag.17 IRIS “innovations”: Risk-Informed approach in design

phase and collaborative teams 11

DESIGN/SAFETY ANALYSIS TEAM

PSA TEAM

Providing IRIS system data (initial)

Incorporation of changes in design

PSA Procedure

“Risk-informed Design” procedure

Providing IRIS system data (update)

Identification of high risk scenarios

Analysis of system/component reliability

Analysis of identified sequences

Identification of sequences requiring analysis

Recommend changes to improve PSA results

start

§  Iterative approach: Deterministic Safety Analysis and PSA calculation, during design analysis & development




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ENEA, Roma 2018.mag.17 IRIS “innovations”: Risk-Informed approach results

2003 2004 2005 2006

1.90E-6

2.38E-8

DesigndevelopmentPSADesigndevelopmentPSA…

ExternalEvents(seismics)

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ENEA, Roma 2018.mag.17 IRIS “innovations”: Risk-Informed approach and EPZ

reduction

§  Elimination/strong reduction (NPP fences) of the Emerg. Planning Zone §  New procedure proposed: Deterministic + Probabilistic analysis to evaluate

EPZ size (as a function of radiation dose limit and NPP safety level)

§  Procedure developed within a IAEA CRP; discussed with NRC

US Emergency Planning Zone: 10 miles

«CAORSOsite

France Evacuation Zone: 5 km

IRIS: 1 km

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ENEA, Roma 2018.mag.17

50 m

23 m

22 m

21 m

56 m

~ 1 m gap

Ground level

Horizontal Fail-safe System

Flood level

~ 1 m thick

IRIS “innovations”: goal-driven design change

Numerical and experimental study:

–  120 rubber-steel isolators (High Damping Rubber Bearings-HDRBs), 1 m diam, 84 mm height

–  PGA = 0.3 g, isolation frequency = 0.7 Hz -  lateral displacements < 12 cm -  25% reduction PGA at vessel supports level,

5 times reduction at roof level

–  HDRB experimental campaign performed

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HDRBs




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Conferenza Data

Luogo

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IRIS “innovations”: O&M

PWR Surveillance Program Comparison

0 1000 2000 3000 4000

Cur

rent

18

-M

onth

Cyc

le

Prop

osed

48-M

onth

Cyc

leUnresolved On-line Off-line

54

1858 1831

1206 2537

§  Main Goal: Perform maintenance shutdowns no sooner than each 48 months

§  MIT study (1996): 3743 maintenance items (on-line and off-line) identified

§  Accounting for IRIS configuration, after MIT study only 7 items unresolved

§  TVA addressed and resolved or found resolution programmes for all 7 items




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ENEA, Roma 2018.mag.17 IRIS “innovations”: Economy of Multiples vs .

Economy of Scale

€

Designsimplification

€

Investmentscalability

€ Modularisation

€

Learningprocess

3006009001200

€

Multipleunitsonsamesite

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ENEA, Roma 2018.mag.17 IRIS “innovations”: impact of Universities

§  Young talents’ collaboration: ü within University labs and/or through Company internships ü  thesis work, PhD program, post-graduation period

§  Formal agreements (students exchange) among U-IRIS; formal/informal agreements with Companies

§  >130 students worked on IRIS project §  ∼∼400 papers co-authored by students, professors, experts (open

literature) §  Professors/permanent researchers involved: >30

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Conferenza Data

Luogo

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Conclusions: “Lessons learned”

§  Whattodo ü  Why

1.  Addressall(several,key)topics,sincethebeginningofthedesigndevelopment

Avoidseriousdrawbacksinthefuture

2.  Multidisciplinaryteam Reallyeffectiveengineeringsolutions

3.  EarlyinteractionwithSafetyAuthority Acceleratelicensingprocess(andletSafetyAuthority“learn”…)

4.  Youngtalentedresearchers/professionalsinvolved,workingtogetherwithexperiencedbutopen-minded,non-biasedpeople

Createan“explosive”(i.e.effective)mix,accelerateHRgrowth

5.  Internationalenvironment Highculturalexperience,benefitforcapability/businessdevelopment

6.  Periodicglobalmeetings Awarenessoftheendeavour,moreeffectiveteam

7.  Symphonicteam:mixindustry(designers,manufacturers,…),R&D,Academia,TSO

Hugeincreaseinprojecteffectiveness

8.  InspiringProjectManagers Thisexperienceisunique,isthedesireofaprofessionallife,andmayoccuronlyonce




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ENEA, Roma 2018.mag.17 The IRIS experience: a friendly & fruitful collaboration

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Titolo presentazione - ENEA€¦ · CeSNEF-Nuclear Engineering division HISTORIA MAGISTRA VITAE TECNOLOGIE NUCLEARI INNOVATIVE: ... – Implements engineering innovations, new solutions,