Title of article
AnalysisofnaturalcirculationphenomenainVVER-1000OriginalResearchArticle
Author/Authors
SeyedKhalilMousavian، نويسنده , , FrancescoD’Auria، نويسنده , , MahmoudA.Salehi، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2004
Pages
22
From page
25
To page
46
Abstract
Inalllightwaterreactors(LWR),naturalcirculationisanimportantpassiveheatremovalmechanism.Inthepresentpaper,thenaturalcirculationphenomenaarestudiedwithreferencetostep-wisecoolantinventoryreductionandasmallbreakloss-of-coolant-accident(SBLOCA)inthecoldlegofVVER-1000.Thenaturalcirculationflowmap(NCFM)approachisconsideredtoevaluatethenaturalcirculationperformanceoftheVVER-1000NPPalsocomparingVVER-1000andPWRsystems.Threedifferentelevationsbetweenheatsource(core)andheatsink(steamgenerators)zoneshavebeenconsideredinordertocharacterizethebuoyancyforceinaVVER-1000.Theinfluenceofpowerandthecoldlegsloopsealuponthenaturalcirculationperformanceisalsoevaluated.Inthesecondpart,aseriesofSBLOCAsimulationswithbreakarearangingfrom0.5to11.7%ofthecoldlegcrosssectionalareaareperformedstartingwiththeVVER-1000systeminnominalconditions.TheeffectofEmergencyCoreCoolingSystem(ECCS)includingpassiveandactivepartsofECCSareevaluated.ThesimulationswereperformedbythehelpofthesystemcodeRELAP5.Withintheframeworkofthequalificationoftheadoptedcomputationaltools,theresultsarecomparedwithexperimentaldatafromKozloduyNPPunit6testandPSB-VVERintegraltestfacilityavailablefromtheliterature.Namely,thequalificationoftheadoptednodalisationinsteadystateconditionsisachievedbyusingexperimentaldata.TheaccuracyofselectedresultshavebeenestimatedinquantitativetermsbyapplyingthefastFouriertransformbasedmethod(FFTBM).Finally,therelevanceandthepotentialfortheoccurrenceoftherefluxcondensationmode,i.e.,oneoftheNaturalCirculationregimes,forcoolingofreactorcoreinVVER-1000arediscussed.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2004
Journal title
Nuclear Engineering and Design Eslah
Record number
894697
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