Diagnostic Systems into the Vacuum Vessel S. Pak a , J-M Drevon b , - - PowerPoint PPT Presentation

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Diagnostic Systems into the Vacuum Vessel S. Pak a , J-M Drevon b , - - PowerPoint PPT Presentation

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KSTAR Conference 2014 Gangwan-do, Korea, 24-26th February 2014 Design of the Common Structure to Install the ITER Diagnostic Systems into the Vacuum Vessel S. Pak a , J-M Drevon b , R. Feder d , J. Guirao b , T. Giacomin b , S. Iglesias b , F.

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Design of the Common Structure to Install the ITER Diagnostic Systems into the Vacuum Vessel

  • S. Paka, J-M Drevonb, R. Federd, J. Guiraob, T. Giacominb, S. Iglesiasb,
  • F. Josseaumeb, G.D. Loesserd, P. Maquetb, M. Portalesb, M. Proustb, S. Pitcherb,
  • A. Serikovc, A. Suarezb, V. Udintsevb, C. Vacasb, M.J. Walshb, Y. Zhaid

aNational Fusion Research Institute, Daejeon, Korea bITER Organization, St Paul-lez-Durance, France cKarlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany dPrinceton Plasma Physics Lab, Princeton, NJ, USA

KSTAR Conference 2014 Gangwan-do, Korea, 24-26th February 2014

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Outline

 Introduction to ITER port- based diagnostics  Generic port plug for diagnostics  Engineering challenges

  • Structural integrity
  • Port plug handling for installation
  • Neutron shielding
  • Maintenance by remote handling
  • French regulations: nuclear pressure equipment (ESPN), safety (Order

1984)

  • Manufacturing
  • Interface with VV port seal flange

 Summary

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Introduction to ITER Port-based Diagnostics

ITER has approximately 45 diagnostic systems to measure the plasma and condition of the first-wall

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Introduction to ITER Port-based Diagnostics

Among 18 ports at the upper and equatorial level, 10 Upper Ports and 8 Equatorial Ports are dedicated to diagnostics. These port plugs host 80 %

  • f ITER diagnostics.
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Introduction to ITER Port-based Diagnostics

Systems Tenant DA Design Level VUV KO CDR NAS KO CDR UVNC RF Pre-CDR

Port-based diagnostics are installed in three distinct areas: Port plug, interspace, and port cell. Port Integration in upper port #18 Port Plug Interspace Port Cell

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Generic Port Plug for Diagnostics

The port plug structure is a common platform to install the in-port plug diagnostic components. 6 m 1.3 m 1.3 m 3.1 m 1.9 m 2.4 m 25 tons 45 tons Upper Port Plug Equatorial Port Plug

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Generic Port Plug for Diagnostics

The port plug consists of diagnostic first wall (DFW), diagnostic shield module (DSM), and port plug structure. Final Design Review done by IO in June 2013  No major issue (no Cat I chit) This talk focuses on the upper port plug (UPP) structure. A simple metal box, but a leading component for DFW/DSM and diagnostic design.

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Engineering Challenges

UPP size satisfying conflicting requirements UPP size is constrained by the VV port and the gap in-between. Gap around UPP (-)

  • Neutron streaming
  • Space for diagnostic

integration in the port plug Gap around UPP (+)

  • Port plug handling for installation
  • Manufacturing tolerance
  • Structural deflection due to external

loads (EM, seismic, etc): cantilever with a heavy payload at the front

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Neutron Streaming

Shut-Down Dose Rate 12 Days After Operation: Target in Interspace < 100 μSv/hr Maintenance issue Total dose limit in ITER: 500 mSi- person/year

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Neutron Streaming

 Current SDDR 108 μSv/hr in the interspace of the upper port

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Port Plug Tolerance Study

  • Manufacturing tolerance of VV,

blankets and PP

  • Assembly procedure
  • Port plug handling tolerance
  • UPP deflection (max. 12mm)
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Load combination for Structural Assessment

Operating conditions Initiating event concatenat ed events Cat # of events

(1)

Comment (4)

I.1 DW, PresO, THO BOLT / PIN PRE-TENSION

  • I

30000 I.2 DW, PresB, THB BOLT / PIN PRE-TENSION

  • I

500 I.3 DW, PresO, THO BOLT / PIN PRE-TENSION MD I

  • I

2600 II.1 DW, PresB, THB BOLT / PIN PRE-TENSION SL-1

  • II

1(2) II.2 DW, PresO, THO BOLT / PIN PRE-TENSION MDII Coolant Accident(3) II 400 To envelop all the combinations related, the number of events is conservatively assumed to be the same as the frequency of MD II and VDEII, respectively. II.3 DW, PresO, THO BOLT / PIN PRE-TENSION VDE II(5) Coolant Accident(3) II 300 II.4 DW, PresO, THO BOLT / PIN PRE-TENSION SL-1 MD I II 1(2) III.1

DW, PresB, THB BOLT / PIN PRE-TENSION

SMHV III

  • III.2

DW, PresO, THO BOLT / PIN PRE-TENSION

SL-1 MD II III

  • III.3

DW, PresO, THO BOLT / PIN PRE-TENSION

SL-1 VDE II III

  • III.4

DW, PresO, THO BOLT / PIN PRE-TENSION

SMHV Coolant Accident(3) III

  • III.5(6)

DW, PresO, THO BOLT / PIN PRE-TENSION VDE III(5) Coolant Accident(3) III

  • IV.1

DW, PresB, THB BOLT / PIN PRE-TENSION SL-2 IV

  • IV.2

DW, PresO, THO BOLT / PIN PRE-TENSION MD IV Coolant Accident(3) IV

  • IV.3

DW, PresO, THO BOLT / PIN PRE-TENSION VDE IV(5) Coolant Accident(3) IV

  • IV.4

DW, PresO, THO BOLT / PIN PRE-TENSION SL-1 MD III IV

  • IV.5

DW, PresO, THO BOLT / PIN PRE-TENSION SL-2 Coolant Accident(3) IV

  • 1. Dead Weight (DW) - The dead weight of the UPP

and its modules is 25 tons max, where 25 tons is the dry weight limit imposed by the Remote Handling Cask System.

  • 2. Plasma Disruption Electromagnetic Loads - The

dominate load on the UPP structure is the electromagnetic (EM) load associated with plasma

  • disruptions. Several DINA disruption scenarios have

been studied, the worst of which with respect to UPP loading are VDE_UP_LIN36 and VDE_UP_SLOW_FAST.

  • 3. Category II Seismic Loads (SL-1) – Weaker seismic

event, assumed to be equal as a first approximation to SL-2 / 3.

  • 4. Category III Seismic Loads (SMHV) – The most

penalizing earthquake liable to occur over a period of about 1000 years, assumed to be equal to SL-2 multiplied by a factor 0.73 as a first approximation.

  • 5. Category IV Seismic Loads (SL-2) – Strong seismic

event, defined by two spectra: SMS and PALEO spectra.

  • 6. Operating Thermal Loads (THO) – Thermal

expansion stresses associated with normal full power plasma operation (water coolant at 70 C or 100 C).

  • 1. Baking Thermal Loads (THB) – Thermal expansion

stresses associated with vacuum baking (baking water at 240 C).

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Structural Assessment

Worst load combination:  Dead Weight +Thermal load + Seismic load (SL-1) + EM load (VDE II)

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Structural Assessment

Worst load combination:  Dead Weight +Thermal load + Seismic load (SL-1) + EM load (VDE II) Max. Displacem ent = 12.5 mm

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DSM mounting

Design requirements

  • Transfer large EM load from DFW/DSM to

UPP structure

  • DSM insertion without jamming
  • Achievable assembly tolerance
  • Accommodate thermal gradient (50 C)

between UPP structure and DSM

80% of EM load occurs in DFW/DSM

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Cooling and Heating

  • Gun-drilled water channels  minimized wet welding and single

wall structure

  • Jumper channels between four plates
  • Plug welding
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Manufacturing

  • French regulation
  • Nuclear pressure equipment (ESPN): (Agreed) Notified Body, In-service

inspection every 4 years  Activities on ESPN exemption are on-going.

  • Safety important component (French order 1984)
  • Manufacturing by RCC-MR
  • ITER vacuum handbook  ESR (Electro-slag remelting) material
  • SS 316 L(N)-IG to satisfy the radiation requirement (radiowaste, dose rate) in

ITER according to ALARA (as low as reasonably achievable)

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Maintenance by Remote Handling

UPP Installation by RH cask

  • Gripping point
  • Space reservation for rails and skids

RH operation in Hot Cell

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Interface with Port Seal flange

Lip Seal (Current baseline) Gasket seal option

  • Maintenance
  • leak test
  • in-service

inspection  The seal flange has impact on the UPP design, but it will require only the geometrical modification which is not relevant to the structural integrity of UPP.

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Summary

 FDR of the UPP structure was successfully conducted in June 2013 without major issue (no Cat. I chit).  It means that the structural infrastructure has been provided to enable the diagnostic design & integration to move forward.  Even though the design is finalized, a potential possibility of the UPP design change exists due to the interface change of other PBSs.  Now we move to the manufacturing stage and the call for tender is expected this year through international bidding.

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Thank you very much for your attention !!

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Back Slides

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Design of Diagnostic GUPP

 Assembly sequence

  • 1. Assemble DFW + DSM + Diagnostics
  • 2. Insert the DFW/DSM assembly into GUPP

from the plasma side

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SLIDE 24

Design of Diagnostic GUPP

 DSM fixation

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GUPP FDR

 GUPP FDR was held in June 2013 and chaired by B. Levesy. FDR panel report: ITER_D_J9328T_v1.0  The outcome was 32 chits in total.

  • No Cat I Chits
  • 20 Cat II Chits  nine of them should be closed before call for

tender (foreseen in 2014)

  • 12 Cat III chits (no official tracking required)

Interfaces

  • Vacuum vessel port
  • DFW, DSM and diagnostics
  • Port plug handling and neutronics (PCR-439)

Cost optimization

  • ESPN
  • RCC-MR
  • Material grade
  • SIC classification
  • ESR material requirement

Manufacturability

  • Test and control list
  • Demonstration of manufacturability

* Issue on Asymmetric rotating VDE

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SLIDE 26

 Cask double door opening

  • 6. Remove PP by RH cask
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SLIDE 27

 Plug is pulled into the cask until the final position

  • 6. Remove PP by RH cask
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SLIDE 28

 Cask removal

  • 6. Remove PP by RH cask
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SLIDE 29

 Cask removal

  • 6. Remove PP by RH cask