University R & D Session. KAIST Activities

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1 Univerity R & D Seion KAIST Activitie Jeong IK Lee Aociate Profeor Dept. of Nuclear & Quantum Engineering, KAIST

2 Iue Studied in KAIST Larger power ytem require higher pecific power Advanced turbomachinery and heat exchanger deign and analyi methodologie New type of component or ytem Tranient analyi (Startup, Shutdown, Incident ) Specific Technical Iue to Specific Heat Source Critical Flow and Phae Change Material 1

3 Increaing Specific Power

Turbomachinery Deign & Analyi Tranient analyi KAIST_TMD - 1D

analyi for abnormal ytem operation cenario m = ρ( T, P ) AV V h0 =

<Fluid Sytem> Jext F1D Bvol F3D <Wall Sytem> W1D W3D Pkin Fuel

5 83 Turbomachinery Efficiency-Mdot Map On-deign point Valve etc.

5 rpm=3600 rpm=4500 rpm=5400 rpm=6300 rpm=700 8 00 300 400 500 600

External junction V&V Internal flow analyi can be upported by 3D

3D model information generation : Boundary volume #40 : Pipe wall

4 Turbomachinery Deign & Analyi Tranient analyi KAIST_TMD - 1D Meanline Analyi - Turbomachinery performance map upport tranient analyi for abnormal ytem operation cenario m = ρ( T, P ) AV V h0 = h + KAIST_TMD Gtab Ctl Plt P( h, ) T ( h, ) SmHX Pump Comp Turb <Fluid Sytem> Jext F1D Bvol F3D <Wall Sytem> W1D W3D Pkin Fuel Ccon Total to Total Efficiency (%) Turbomachinery Efficiency-Mdot Map On-deign point Valve etc. Scon etc. 8.5 rpm=3600 rpm=4500 rpm=5400 rpm=6300 rpm= Ma Flow Rate (kg/) 3D CFD analyi : Fluid block : External junction V&V Internal flow analyi can be upported by 3D CFD analyi Complementary aitance platform can be contructed from 3D model information generation : Boundary volume #40 : Pipe wall Pipe #30 #50 Pipe : Expanion valve (Globe valve) #5 Comp #0 Cooler #60 Pipe #10 #15 : CO #300 #10 #110 Pipe #100 Pipe : Cooling water #00 3

5 Turbomachinery Deign Iue Converion method Equation Definition baed h o v = h + Ideal ga baed Real ga ientropic ex ponent baed p p p p T T o o o γ 1 = 1+ M T T o γ 1 = 1+ M n 1 = 1+ M n 1 = 1+ M γ γ 1 1 n 1 mn n 1 Meridional velocity (m/.) "Real Ga - Numerical", Impeller tip peed "Real Ga - Numerical", Abolute velocity "Real Ga - Numerical", Relative velocity "Real Ga - Exponent", Impeller tip peed "Real Ga - Exponent", Abolute velocity "Real Ga - Exponent", Relative velocity Tangential velocity (m/) Axial ditance (m) "Real Ga - Numerical", Impeller "Real Ga - Numerical", Diffuer "Real Ga - Exponent", Impeller "Real Ga - Exponent", Diffuer Radial ditance (m) 4

6 Heat Exchanger Deign & Analyi 5

7 New Component A Tela turbine will be teted in S-CO power cycle expander operating condition. KAIST SCO PE Tela turbine The external preure veel allow to tet in high preure (>7.4 MPa) Conventional Turbine Tela turbine Blade Impule & reaction force Well experienced, optimized Characteritic Need high quality clearance No phae change allowed Bladele dic Friction force Low Preure ratio (S-CO cycle) Manufacturing - eay and modularized deign Robut - Two phae, Sludge flow Maintenance Difficultie Eay maintenance 6

8 New Sytem <With 8 fan and generator> <Conceptual figure of KAIST MMR> <MMR core deign> 7

9 Tranient Analyi for Control 8

SCOPE compreor V&V between GAMMA+ code and SCOPE tet data Tranient

10 Tranient Analyi for Prediction GAMMA+ code modification The parallel configuration of model in the GAMMA+ Off-deign performance map of SCOPE compreor V&V between GAMMA+ code and SCOPE tet data Tranient preure data comparion Nodalization diagram of the SCOPE loop for GAMMA+ code 9

11 Specific Technical Iue to Sodium-cooled Fat Reactor Application Na (~0.1MPa) Ingre of high-preure CO & Na-CO interaction Micro-meter ize crack CO (~0MPa) Fig. Potential Na-CO interaction in Printed Circuit Heat Exchanger(PCHE) T Na = T Na = Ignition cae T Na = 585 Na-air reaction 10

Critical Flow and Phae Change CO critical flow modeling proce CO

CO critical peed meaure intrument Temperature ( C) 180 Exp_1

point 0MPa 15MPa 10MPa 5MPa time 1.0 1.5.0.5 3.

1MPa High-preure tank Low-preure tank time High Preure Tank Low

12 Critical Flow and Phae Change CO critical flow modeling proce CO leak imulation reult (T-, h- diagram, Ma flux of leaked CO ) Fig. CO critical peed meaure intrument Temperature ( C) 180 Exp_1 Exp_1 160 Exp_ Exp_ 140 Exp_3 10 Exp_ Critical point 0MPa 15MPa 10MPa 5MPa time Entropy (kj/kg-k) 1MPa 0.1MPa High-preure tank Low-preure tank time High Preure Tank Low Preure Tank Exp_1 Exp_ Exp_3 P (MPa) T ( ) P (MPa) T ( )

Material Corroion and carburization behavior in S-CO environment Corroion tet in S-CO environment (550-650 o

3000h) Evaluate the corroion and carburization reitance in S-CO environment Material: Fe-bae autenitic

and reulting mechanical property (tenile tet) Creep tet in S-CO environment (550-650 o C, 00bar) Corroion

13 Material Corroion and carburization behavior in S-CO environment Corroion tet in S-CO environment ( o C, 00bar, max. 3000h) Evaluate the corroion and carburization reitance in S-CO environment Material: Fe-bae autenitic alloy, Ni-bae alloy, FMS (9Cr) Long-term propertie of material after expoure to S-CO Microtructure evolution and reulting mechanical property (tenile tet) Creep tet in S-CO environment ( o C, 00bar) Corroion and long-term propertie of diffuion-bonded PCHE material Development of diffuion-bonding proce for PCHE-type IHX Corroion tet and mechanical property evaluation of diffuion bonded joint in S-CO environment 1

Bernoulli s equation may be developed as a special form of the momentum or energy equation.

Bernoulli s equation may be developed as a special form of the momentum or energy equation. BERNOULLI S EQUATION Bernoulli equation may be developed a a pecial form of the momentum or energy equation. Here, we will develop it a pecial cae of momentum equation. Conider a teady incompreible flow