Operation conditions of the emergency condenser of the SWR1000

Siemens AG is developing the innovative boiling water reactor concept SWR1000. New features are the passive safety systems (e.g. emergency condenser, building condenser, passive pressure pulse transmitter). For the experimental investigation of the emergency condenser effectiveness, the NOKO test fa...

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Bibliographic Details
Published in:Nuclear engineering and design 1999-05, Vol.188 (3), p.303-318
Main Authors: Schaffrath, A, Hicken, E.F, Jaegers, H, Prasser, H.-M
Format: Article
Language:English
Subjects:
Accident prevention
Applied sciences
Computer simulation
Condensation
Condensers (liquefiers)
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Heat transfer
Heat transfer coefficients
Installations for energy generation and conversion: thermal and electrical energy
Operations research
Pressure
Pressure vessels
Temperature
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Summary:Siemens AG is developing the innovative boiling water reactor concept SWR1000. New features are the passive safety systems (e.g. emergency condenser, building condenser, passive pressure pulse transmitter). For the experimental investigation of the emergency condenser effectiveness, the NOKO test facility has been constructed at the Forschungszentrum Jülich. The facility has an operating pressure of 10 MPa and a maximum power of 4 MW. The emergency condenser test bundle consists of eight tubes and is fabricated with planned geometry and material of the SWR1000. In more than 200 experiments, the emergency condenser capacity was determined as a function of pressure, water level and concentration of non-condensables in the pressure vessel, as well as of pressure, water level and temperature in the condenser. For the evaluation of the NOKO experiments, the program system CASH-Graphics (Computergestützte Auswertung und Unsicherheitsanalyse) was developed. This evaluation is the basis for the determination of the operation conditions of the emergency condenser. Post-test calculations of NOKO experiments were performed with an improved version of ATHLET. To calculate the heat transfer coefficients during condensation in horizontal tubes, the module KONWAR has been developed and implemented in ATHLET. KONWAR is based on the flow regime map of Tandon and includes several semi-empirical correlations for the determination of the heat transfer coefficients. The comparison between calculations and experiments shows a good agreement.
ISSN:0029-5493
1872-759X
DOI:10.1016/S0029-5493(99)00044-8