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    FUKUSHIMA DAIICHI UNIT 1 (MELCOR 1.8.6)

    BRAUN Matthias, DTIPP7-G

    Zagreb, 04/26/2018

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    Property of Framatome - © Framatome All rights reserved

    Fukushima Daiichi Unit 1– BRAUN Matthias, DTIPP7-G – Zagreb, 04/26/2018

     Not part of the BSAF OECD Benchmark Project  Did not receive undisclosed information from TEPCO / JAEA  Relying only on publically available input data  No legal restrains for usage & publication (project and export control)

     Why  Test of simulation capabilities (code and user) and as MELCOR 1.8.6 to 2.x conversion test base  Support for training courses (accident awareness trainings for crisis team members and sometimes operators )  Improvement of Severe Accident Management Guidelines (SAMG)  Optimization of usage of severe accident hardware

    (Passive autocatalytic recombiners, Filtered containment venting systems)  Contribution to the international MELCOR community

     Model description report containing all input data (FGF_D02-ARV-01-111-828)  revision B (hardcopy) on EMUG2018  revision C (electronically) and the MELCOR input model at CSARP/MCAP 2018. (planned)

    p.2

    Introduction

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    Fukushima Daiichi Unit 1– BRAUN Matthias, DTIPP7-G – Zagreb, 04/26/2018

     RPV & Core  Typical GE BWR RPV geometries (well standardized)  Generic 7x7 fuel assemblies

     Experimental (non-recommended) features  RPV leakage before failure via TIP dry tubes  More CVH volumes in lower plenum  Separating lower plenum in channel & bypass,

    representing the control rod guide tubes  Fuel assembly skeleton as supporting structure  Maximizing the COR detail depth to

    7 rings and 35 levels (more leads to crash)  Additional core collapse criteria

    (collapse of fully oxidized assemblies without lateral support)

     Maximum void 0.4 -► 0.7 (RPV water inventory)  Time-dependent oxidized rod collapse model

    (Critical thickness of unoxidised Zr -► 0.0) p.3

    Overview of the MELCOR model for 1F1

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    Fukushima Daiichi Unit 1– BRAUN Matthias, DTIPP7-G – Zagreb, 04/26/2018

     Nuclear systems  Operational systems like main steam,

    feedwater (steady state initiation)  Safety systems like Isolation Condenser,

    core spray, External water injection (fire engines)  RPV liquid level measurement system

    (failure of the measurement)

     Noticeable from core spray system  Spray package can malfunction at high pressure

     Noticeable from IC modelling:  MELCOR overestimates departure

    from nucleate boiling at low pressures  IC operation did not work until secondary side pressure

    was increased from 1 bar-abs to 2 bar-abs

    p.4

    Overview of the MELCOR model for 1F1

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    Fukushima Daiichi Unit 1– BRAUN Matthias, DTIPP7-G – Zagreb, 04/26/2018

     Containment  Wet-well / suppression pool sub-divided

    to allow for thermal stratification (-► spool scrubbing issue)

     Dry-well sub-divided to address over-temperature failure of hatches (-► too fast convection in lumped parameter codes)

    p.5

    Overview of the MELCOR model for 1F1

    CV750

    CV745

    CV721 CV723

    C V7

    80

    CV790

    HS721.01 HS750.01 HS723.01

    751.11

    H S

    76 1.

    11 H

    S7 41

    .2 1

    771.12

    HS771.13

    H S7

    70 .1

    4

    H S

    76 3.

    11 H

    S7 43

    .2 1

    773.12

    HS773.13

    H S7

    83 .1

    1

    CV760

    FL750 FL755

    HS721.11

    HS721.12

    HS731.11

    HS731.12

    HS731.13

    HS731.15

    HS731.16

    FL753

    C V7

    41

    C V7

    43

    HS790.15

    HS741.11

    HS741.12

    HS741.13

    HS791.11

    H S7

    81 .1

    1

    H S

    78 3.

    12

    H S

    78 1.

    12

    HS723.12

    HS733.11

    HS733.12

    HS733.13

    HS731.14 HS733.14

    HS733.16

    HS733.17

    HS791.12

    HS741.14

    HS743.11

    HS743.12

    HS743.13

    HS793.11

    HS743.14

    HS793.12

    HS799.14

    FL721 FL723

    FL733FL731

    FL743FL741

    FL 78

    0

    FL 78

    0

    FL909

    FL763

    FL760 FL765

    CV770

    FL781

    FL786

    FL783

    FL788

    Sector 1 (315° - 45°) Sector 3 (135° - 225°)

    HS71 1/8.1

    6

    HS71 1/8.1

    4

    HS 71

    1/8 .13

    HS71 1/8.1

    5 CV71

    1/8

    CV661/8

    CV621/8 CV600

    FL70 1/8

    FL611/8

    HS711/8.11

    HS711/8.12

    CV641/8 FL631/8

    HS600.01 HS600.02

    HS621/8.01

    HS641/8.01

    HS641/8.02

    HS641/8.03

    HS661/8.01

    HS661/8.02

    HS661/8.03

    HS661/8.04

    HS661/8.05

    HS661/8.06

    HS661/8.07 HS661/8.08

    HS661/8.09

    HS661/8.10

    HS723.11

    Access door (1.9m x 0.77m)

    HS71 .14 4/5

    HS71 .13

    4/5

    HS71 .15 4/5

    CV714/5 HS714/5.16

    FL704/5

    CV624/5

    CV644/5

    HS600.01

    HS600.02

    HS62 .014/5

    HS64 .014/5

    HS64 .024/5

    HS64 .034/5

    HS66 .014/5

    HS66 .024/5

    HS66 .034/5

    HS66 .044/5

    HS66 .054/5

    HS66 .064/5

    HS66 .074/5 HS66 .084/5

    HS66 .094/5

    HS66 .104/5

    CV664/5

    CV600

    FL614/5

    HS71 .114/5

    HS71 .124/5

    FL634/5

    CV731 CV733

    HS733.91 Inner HS 10t steel 5mm thick

    HS731.91 Inner HS 10t steel 5mm thick

    HS741.91 Inner HS 5t steel 5mm thick

    HS743.91 Inner HS 5t steel 5mm thick

    HS760.91 Floor grating

    753.11

    780.01

    H S7

    90 .1

    4 H

    S7 90

    .1 3

    +2.055 - Torus 05/16 heightth +2.560 - Torus 06/16 heightth +3.065 - Torus 07/16 heightth

    +4.075 - Torus 09/16 heightth

    +4.650 - Header center

    +4.580 - Torus 10/16 heightth

    +3.570 - Torus center elevation

    +7.609 - Torus inner top

    +7.624 - Torus outer top

    +1.046 - Torus 03/16 heightth

    +1.551 - Torus 04/16 heightth

    +1.461 - Downcomer end

    +0.541 - Torus 02/16 heightth

    +0.036 - Torus 01/16 heightth

    +0.000 - RB zero

    -4.000 - Soil

    -1.230 - Torus room floor

    -0.484 - Torus outer bottom

    -0.469 - Torus inner bottom

    +7.104 - Torus 15/16 heightth

    +6.599 - Torus 14/16 heightth

    +12.200 - Sphere equator

    +15.100 - RPV outer bottom

    +27.800 - Shield wall top

    +19.572 - Sphere - Cylinder

    +25.000 - 2nd floor ceiling

    +25.900 - 3rd floor

    +18.700 - 2nd floor

    +11.700 - 1st floor ceiling

    +30.400 - 3rd floor ceiling

    +30.700 - Reactor well floor

    +35.536 - PCV head outer top +35.500 - PCV inner top

    +38.900 - Service floor(5th)

    +31.000 - 4th floor

    +33.000 - PCV cylinder top

    +9.550 - Torus room ceiling

    +10.200 - 1st floor

    +38.500 - 4th floor ceiling

    +27.100 - SFP Floor

    +31.300 - Storage pit floor

    2.565 - RPV outer

    2.870 - Shielding wall inner

    3.370 - Shielding wall outer

    5.500 - Reactor well inner

    7.100 - Reactor well outer

    3.111 - RPV stud ring outer

    +8.173 - Vent pipe top

    +6.527 - Vent bottom

    +6.180 - D/W floor

    +6.777 - Vent bottom + 25cm

    +9.708 - Floor grating top

    +13.340 - CRD hydraulic openings

    +14.660 - Lower pedestal top

    +33.412 - Stud ring top

    +30.888 - Stud ring bottom

    +31.650 - RPV seal surface

    +34.290 - RPV outer top

    2.500 - Lower pedestal inner

    3.500 - Lower pedestal outer

    1.877 - Skirt inner radius

    4.877 - PVC cylinder inner

    14.785 - Torus major radius

    8.858 - PCV shpere outer

    8.850 - PCV shpere inner

    10.100 - PVC basemat outer

    10.600 - PVC walls (ground floor)

    7.000 - PCV walls (1st & 2nd floor) 6.472 - PCV floor radius

    1.800 - RPV support ring inner

    1.917 - Skirt outer radius

    4.913 - PVC cylinder outer

    CV721

    HS72HS721.11

    HS721.12

    HS731.11

    HS731.12

    FL721

    HS71 1/8.1

    6

    HS71 1/8.1

    4

    HS 71

    1/8 .13

    HS71 1/8.1

    5 CV7

    11/8

    CV661/8

    CV621/8 CV600

    FL70 1/8

    FL611/8

    HS711/8.11

    HS711/8.12

    CV641/8 FL631/8

    HS600.01 HS600.02

    HS621/8.01

    HS641/8.01

    HS641/8.02

    HS641/8.03

    HS661/8.01

    HS661/8.02

    HS661/8.03

    HS661/8.04

    HS661/8.05

    HS661/8.06

    HS661/8.07 HS661/8.08

    HS661/8.09

    HS661/8.10

    +8.173 - Vent pipe top

    +6.527 - Vent bottom

    +6.180 - D/W floor

    +6.777 - Vent bottom + 25cm

    +9.708 - Floor grating top

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