Analysis of a total loss of pool water accident in MTR-type research reactors
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A. Yilmazer
Abstract
In this study, the transient in which the pool water is lost throughout one or more of the main coolant pipes which are supposed to be broken guillotine-like is investigated for the TR-2 research reactor in Istanbul. The applicability of the methods used for other similar types of research reactors is shown. Decrease of the pool water level until the top of the core, and from the top to the bottom of the core are examined as two successive phases of the accident. Finite difference scheme and integral methods are employed to solve energy equations and the results of both methods are compared. The finite difference solution uses an explicit form for the analysis of the first phase, and a moving boundary approach for the second phase. The integral method is based on the assumption that the temperatures appearing in the energy equations have the same profiles during the transient as the steady state ones. Analyses are done both for nominal and hot channel, and the results of both methods are observed to be in agreement.
Kurzfassung
In der vorliegenden Studie wird für den TR-2 Forschungsreaktor in Istambul die Transiente untersucht, bei der ein Kühlwasserverlust durch ein oder mehrere gebrochene Hauptkühlrohre eintritt. Dabei wird die Anwendbarkeit von Methoden wie sie für andere ähnliche Typen von Forschungsreaktoren verwendet wurden gezeigt. Ein Sinken des Wasserspiegels im Pool bis zum Reaktorkern und weiter vom oberen bis zum unteren Ende des Kerns wurden als zwei aufeinanderfolgende Phasen eines Unfalls untersucht. Es werden die Methode der finiten Differenzen und integrale Verfahren verwendet um die Energiegleichungen zu lösen und die Ergebnisse verglichen. Lösungen mit Hilfe der finiten Differenzen verwenden eine explizite Form der Analyse der ersten Phase und eine flexible Übergangsnäherung für die zweite Phase. Die integrale Methode basiert auf der Annahme, dass die in den Energiegleichungen erscheinenden Temperaturen während der Transienten die gleichen Profile haben wie im stationären Zustand. Analysen werden sowohl für den nominalen wie auch für den heißen Kanal durchgeführt und es zeigt sich, dass die Ergebnisse beider Methoden übereinstimmen.
References
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© 2004, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Investigation on bifurcation characteristics of a natural circulation system with low steam quality and low pressur
- Analysis on special two-phase flow instabilities at full power natural circulation reactor condition
- Analysis of a total loss of pool water accident in MTR-type research reactors
- Calculation of control plates life time and worth at the ETRR-2 research reactor
- Nitrogen transport in the primary circuit of a VVER during a LOCA occurring under plant cool-down conditions
- Optimisation of occupational exposures during site remediation at WISMU
- Practical applications of the exemption principle in radiation protection
- Technical Note
- Determination of the replacement cooling tower capability at the ETRR-2 research reactor
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Investigation on bifurcation characteristics of a natural circulation system with low steam quality and low pressur
- Analysis on special two-phase flow instabilities at full power natural circulation reactor condition
- Analysis of a total loss of pool water accident in MTR-type research reactors
- Calculation of control plates life time and worth at the ETRR-2 research reactor
- Nitrogen transport in the primary circuit of a VVER during a LOCA occurring under plant cool-down conditions
- Optimisation of occupational exposures during site remediation at WISMU
- Practical applications of the exemption principle in radiation protection
- Technical Note
- Determination of the replacement cooling tower capability at the ETRR-2 research reactor
