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Fuel Coolant Interaction of Liquid Tin.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
2014 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

 

In the case of a severe accident in a nuclear power plant the reactor

may heat up, melt and mix with fuel material to form a substance called

corium. In today's nuclear power plants the primary strategy to cool the

corium in the event of a severe accident is to flood the ex-vessel cavity

with water. The reactions which occur when the liquid metal comes in

contact with the water, known as fuel coolant interaction (FCI), can be

violent and in the worst case scenario lead to containment failure. In

the MISTEE laboratory at KTH, small scale FCI experiments are conducted.

This thesis explores how dierent temperatures of liquid tin and

water aects the presence of steam explosion. Higher melt superheat and

lower water temperature was found to increase the likelihood of steam

explosions. Furthermore, a phenomenon was observed, hereby referred

to as immediate steam explosion, where the melt exploded immediately

upon contact with water. All previous research found states that steam

explosion only occurs in the later stages of FCI, thus the results are contradictory.

The thesis also includes research on jet breakup in the initial phase

of FCI and how it is affected by melt velocity, diameter and temperature

as well as

water temperature. The experiments performed did not yield

data which could be analyzed so no conclusions could be drawn.

Abstract [sv]

Om en allvarlig olycka inträffar på ett kärnkraftverk kan reaktorn värmas

upp, smälta och bilda en smälta som innehåller bränsleämnen. I

dagens kärnkraftverk är den primära strategin för att kyla reaktormaterialet

vid en eventuell allvarlig olycka att fylla utrymmet utanför reaktorn

med vatten. De reaktioner som uppstår när den smälta metallen kommer

i kontakt med vattnet (FCI) kan vara mycket våldsamma och i värsta fall

leda till skador på skyddsväggarna. Vid MISTEE på KTH forskar man

på reaktionerna i liten skala för att få en ökad förståelse för processerna

i FCI. Denna avhandling undersöker sambandet mellan temperaturen på

smältan och vattnet och förekomsten av steam explosion. Högre smält

temperatur och lägre vattentemperatur visade sig öka sannolikheten för

steam explosions. Vidare, ett fenomen observerades, som kommer att refereras

till som omedelbar steam explosion, där smältan exploderade direkt

vid kontakt med vattnet. All tidigare forskning som hittades pekar på att

steam explosions endast sker i senare skeden av FCI.

Avhandlingen inkluderar även forskning på uppbrytning av en metall

stråle i den initiala fasen av FCI och hur den påverkas av strålens

hastighet, diameter och temperatur samt vattnets temperatur. De utförda

experimenten resulterade inte i data som kunde analyseras och inga

slutsatser kunde dras.

Place, publisher, year, edition, pages
2014. , 25 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-149575OAI: oai:DiVA.org:kth-149575DiVA: diva2:740383
Supervisors
Available from: 2014-08-25 Created: 2014-08-25 Last updated: 2014-08-25Bibliographically approved

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