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Safety coefficients and sub-criticality levels EFIT and XT-ADS Gérald Rimpault, Commissariat à l’Energie Atomique (CEA) PowerPoint Presentation
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Safety coefficients and sub-criticality levels EFIT and XT-ADS Gérald Rimpault, Commissariat à l’Energie Atomique (CEA) - PowerPoint PPT Presentation


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EUROTRANS DM1 Safety Meeting 27-28 November, 2008 FZK , RFA. Safety coefficients and sub-criticality levels EFIT and XT-ADS Gérald Rimpault, Commissariat à l’Energie Atomique (CEA) Cadarache Center gerald.rimpault@cea.fr. He-EFIT Core Neutronic characteristics (25/11/08)

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slide1

EUROTRANS DM1 Safety Meeting

27-28 November, 2008

FZK , RFA

Safety coefficients and sub-criticality levels

EFIT and XT-ADS

Gérald Rimpault,

Commissariat à l’Energie Atomique (CEA) Cadarache Center

gerald.rimpault@cea.fr

CEA/DEN/DER Gérald Rimpault

slide2

He-EFIT Core Neutronic characteristics (25/11/08)

Results with ERANOS2.1 using JEFF3.1

Gérald Rimpault, Julian Murgatroyd, Frédéric Jean

CEA/DEN/DER Gérald Rimpault

slide3

He-EFIT Core Lay out

CEA/DEN/DER Gérald Rimpault

slide5

New Core Design – Detailed Characteristics (2/2)

  • Under nominal conditions :
    • Large Margins on cladding temperature (120O °C under normal operating conditions)
    • Fuel max. temperature (1380 °C) respect the design criteria
    • To be cross-checked with CATHARE

CEA/DEN/DER Gérald Rimpault

slide6

IHX Design

Blowers Design

Decay Heat Removal Systems

CEA/DEN/DER Gérald Rimpault

slide8

He-EFIT Feedback coefficients

Axial expansion coefficient takes into account axial expansion and “doppler structure” effects.

All feedback coefficients are negative

except for the axial expansion coefficient which is positive (SiC cladding).

Expansion of PuMAO2 much bigger than SiC in the temperature ranges of the system:

Fuel expansion superseeds SiC axial expansion

CEA/DEN/DER Gérald Rimpault

slide9

XT-ADS CL-P0 Core Neutronic characteristics (13/11/08)

Results with ERANOS2.1 using JEFF3.1

Gérald Rimpault, Frédéric Jean

Two XT-ADS data (CL-P0 Core) cores :

BOL Core : 68 S/A, Pth = 57 MW

BOC Core : 75 S/A, Pth = 57 MW

CEA/DEN/DER Gérald Rimpault

slide12

XT-ADS CL-P0 Core Neutronic characteristics (13/11/08)

  • XT-ADS data (CL-P0 Core) : Values at Room Temperature i.e. 20°C

d(U,Pu)O2 at 20°C = 10,55 g/cm3 (porosity = 0,9485)

  • XT-ADS data (CL-P0 Core) : Operating temperatures
  • K-Effective

CEA/DEN/DER Gérald Rimpault

slide13

XT-ADS data (CL-P0 Core) from room (20°C) to Operating temperatures:

  • Material densities :
  • Expanded Dimensions

CEA/DEN/DER Gérald Rimpault

feedback coefficients theory
Feedback coefficients : Theory

Doppler effect

Absorption and fission resonance widening.

Fuel expansion

Axial expansion

Sodium expansion

Spectrum effect + Leakage effect + Capture

Steel expansion

Axial expansion + Radial expansion

Diagrid effectDiagrid expansion

Differential expansionCore, vessel, rods expansion

CEA/DEN/DER Gérald Rimpault

slide15

XT-ADS Core BOL (68 S/A)

Feedback calculations results (linked / not linked) :

CEA/DEN/DER Gérald Rimpault

slide16

XT-ADS Core BOC/EOC (75 S/A)

Feedback calculations results (linked) :

CEA/DEN/DER Gérald Rimpault

slide17

XT-ADS Core BOL (68 S/A) and BOC/EOC (75 S/A)

Feedback coefficients calculation :

Gert currently checking his results for Axial Expansion

CEA/DEN/DER Gérald Rimpault

slide18

XT-ADS Core BOL (68 S/A)

Reactivity void effects :

CEA/DEN/DER Gérald Rimpault

slide19

XT-ADS Core BOL (68 S/A)

keff safety limits calculation (not linked) :

CEA/DEN/DER Gérald Rimpault

slide20

Pb-EFIT CERCER Core Neutronic characteristics (26/11/08)

Results with ERANOS2.1 using JEFF3.1

Gérald Rimpault, Frédéric Jean

CEA/DEN/DER Gérald Rimpault

slide21

Pb-EFIT CERCER Core BOL

Reactivity void effects :

CEA/DEN/DER Gérald Rimpault

slide22

Pb-EFIT Core

keff safety limits proposal from ANSALDO

CEA/DEN/DER Gérald Rimpault

slide23

Pb-EFIT CERCER Core

keff safety limits results

Maximum value => enveloppe case

Pb plays a shock absorber role

Need to be discussed

Under revision with 380°C as « Hot zero power temperature »

CEA/DEN/DER Gérald Rimpault

slide24

Pb-EFIT CERCER Core

Feedback Coefficients

Coolant expansion under scrutiny

(core, reflector, density, expansion coefficient…)

Massimo Sarotto made the calculation with a variation of 10% in Pb density, only in the active zone. That accounts for -48 pcm/ % density.

CEA/DEN/DER Gérald Rimpault

slide25

Extra Viewgraphs

CEA/DEN/DER Gérald Rimpault

feedback coefficient calculations
Feedback coefficient calculations
  • Références:Notes techniques CEA: M.Vanier, JC Klein (SMFR)

Thèse CEA Na Byung Chan, 1996

  • Doppler effect :
  • Others feedback : linear variation :
  • Coolant expansion :

CEA/DEN/DER Gérald Rimpault

slide27

Feedback coefficient calculations

  • Steel expansion: Axial:

Radial:

  • Fuel expansion:

i = Fuel if not linked, i = steel if linked

  • Diagrid effect:

CEA/DEN/DER Gérald Rimpault

slide28

Feedback calculation method :

CONDITIONS_DE_FONCTIONNEMENT

MILIEU (EDL_MILSTD)

REFERENCE_UNIT 'BBL_REF'

DILATATION

RADIALE 400.0 'MSTRU'

AXIALE 350.0 'MSTRU'

CALCUL LIE

TEMPERATURE

COMBUSTIBLE 875.0

FERTILE 384.0

STRUCTURE 384.0

CALOPORTEUR 350.0

ABSORBANT 384.0

Radial expansion (400°C  200°C)

Axial expansion (350°C  200°C)

Linked/not linked calculation

Fuel expansion (875°C  200°C)

Axial expansion (384°C  200°C)

Coolant expansion (350°C  200°C)

ECCO calculation :

CELLULE 'CCOMB'

EDITION MINI

'ASSEMBLAGE COMBUSTIBLE 1 INITIAL'

TEMPERATURE 1 (TSTRU)

2 (TSTRU)

3 (TCALO)

4 (TCOMBDOP)

5 (TCOMBDOP)

6 (TSTRU)

7 (TSTRU)

8 (TCALO)

9 (TCALO)

10 (TSTRU)

11 (TCALO)

Doppler (TCOMBDOP = 200°C)

CEA/DEN/DER Gérald Rimpault

slide29

XT-ADS Core BOL (68 S/A)

Feedback coefficients calculation :

Adding steel Doppler, Linked value become -0,673

Gerthas found -0.93 and iscurrently checking his results for Axial Expansion

CEA/DEN/DER Gérald Rimpault

slide30

Pb-EFIT CERCER core

inner core: 42 assemblies;intermediate core: 66 assemblies; outer core: 72 assemblies,

CEA/DEN/DER Gérald Rimpault

slide31

Pb-EFIT CERCER core

towards CERMET Core

A Proposal

CEA/DEN/DER Gérald Rimpault