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MELCOR 1.67.6

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• 5th Meeting of European MELCOR User Group (EMUG)

• May 2-3, 2013

• KTH - Albabova, Roslagstullsbaken 21, Stockholm

• A full set of presentation can be requested from HorvathLG@nubiki.hu

Phebus FPT3 test Stand Alone Containment

Thermal hydraulics, Aerosol and Iodine Benchmark with MELCOR 1.8.6

G. L. Horvath, NUBIKI, Budapest

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Contents

• T/H Model setup for MELCOR 1.8.6

• Input data reduction

• Calculated T/H results

• Aerosol and Iodine Model setup

• Calculated Aerosol and Iodine Results

• Conclusions

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MELCOR 1.67.6

Thermal Hydraulics Model for FPT3 Containment

• Single node with HS

• Previous (FPT1) study

reveled that 9 nodes do not give better results for T/H

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MELCOR 1.8.6 results

• T/H reproduced well

• Aerosol deposition agrees with measurement

except deposits remaining on Wet Condensers (all deposits washed to sump)

• Wet condensers deposits may have experienced a chemical reaction

• Gaseous iodine long term behaviour agrees with measurement by ± one order of magnitude,

despite the mass balance error in MELCOR

(applies to IPM – Iodine Pool Model only not to

CONCLUSIONS

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MELCOR 1.8.6 results interpretaton

• Volatiole Iodine results – Class 4

• Calculated and measured iodine results in atmosphere agree by +- one order of magnitude

• However Total (active+nonactive) iodine is at least one order higher than radioactive iodine

• Despite the fact that ALL iodine (class4 ) or CsI (class16) has been entered as radioactive

• How to interprete TOTAL if all is RADIOACTIVE?

CONCLUSIONS

Referenzen

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