Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Utredning av högnivålarm i dränagetank på Ringhals 1
2013 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The problem with high water level alarm that led to power shutdown did first occurred on the 3rd of May 2008 at Ringhals 1. In the beginning there was a theory that boiling triggered the measurement system that consists of a floating switch, it has not been verified if the alarm was triggered by steam or liquid.During the investigation process data was collected from Vattenfalls’ information systems and a RELAP5 model of the drainage system. This model was built with the purpose of simulating different scenario and to gather data that Vattenfall was lacking.It was first stated from Vattenfall that power shutdown was avoided on the 9th of May due to opening a valve more gradually. Analyzes comparing the cases 3rd of May and 9th of May show that the conditions was not equal enough to make the conclusion.Model simulations show that both super heaters take half of the mass flow (assuming negligible differences) from the high pressure turbine under all circumstances, therefore the crossflow pipe takes the other half in cases on the 3rd and 9th of May 2008. A theory that one of the super heaters at 3rd of May was overloaded is not the case according to the model.Liquid that was accumulated and dumped from pipe systems and then triggered the high level alarm was investigated. Results show that the pipe system after the drainage tank can acquire enough water if it is assumed that the water is pushed up into the tank from a back flow.The main goal should be to examine the measured data that occurs more than 3 hours before the high level alarm is triggered and caused a power shutdown at 3rd of May. This due to the fact that no unusual data for the 9th of May was observed.

Place, publisher, year, edition, pages
2013. , p. 100
Keywords [en]
Technology
Keywords [sv]
Teknik, Ringhals, dränagetank, kärnkraft, reaktor
Identifiers
URN: urn:nbn:se:ltu:diva-57134Local ID: dd3254c9-4566-4199-a77b-9cffe66a377aOAI: oai:DiVA.org:ltu-57134DiVA, id: diva2:1030521
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Examiners
Note
Validerat; 20130612 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Open Access in DiVA

fulltext(1794 kB)47 downloads
File information
File name FULLTEXT02.pdfFile size 1794 kBChecksum SHA-512
a393a9d0b8ae53e70a938cb02e3c7a14af638ed5b0b0acf74c2e6e5c1fba47500b8bd55fe52a395bbf9cc6500ac936c58656a73b9e37470e977b94ee96988e86
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Jansson, EricJonsson, Josef

Search outside of DiVA

GoogleGoogle Scholar
Total: 47 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 18 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf