Nuclear Energy for New Europe 2009

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No: 214

Conference: Nuclear Energy for New Europe 2009

Title: Analysis of condensation-induced water hammer in vertical geometry with RELAP5, WAHA and CODEX codes

Theme: Thermal Hydraulics

Author(s): Oleg Melikhov, Vladimir Melikhov, Yuriy Parfenov, Mikhail V. Davydov, Iztok Tiselj, Francesco D'Auria, Nikolaus Muellner

Contact : Vladimir I. Melikhov

E-mail: vladimir.melikhov@erec.ru

Address: Electrogorsk Research & Engineering Centre on Nuclear Plants Safety
142530 Elektrogorsk

Country: Russia

?ondensation-induced water hammer is a thermal-hydraulic phenomenon that occurs in fluid systems when a steam and subcooled water contact directly. Experimental and theoretical studies of this phenomenon in the vertical geometry have been carried out within the frame of the INTAS project 05-1000008-8086 "Condensation-induced water hammer in vertical vessels" by research teams from different institutes.
The validation of WAHA code and CODEX codes was carried out on the basis of experimental data obtained at the small-scale test facility developed for investigation of water hammer in a vertical geometry. A test section of the facility is a vertical tube where overpressure and force of gravity accelerate a column of the subcooled water initially located at the upper section of the tube into the lower section filled with the vapor. The experimental data of 10 tests were used for the validation. In general, the calculation and experimental results are in a reasonable agreement for both codes. Code parameters which have a strong influence on the calculation results were identified within the frame of the sensitivity studies.
The cross-verification of WAHA and CODEX codes with RELAP5 code was carried out for a pre-specified set of NPP operating conditions. The results of the cross-verification are presented in this paper.

No:	214
Conference:	Nuclear Energy for New Europe 2009
Title:	Analysis of condensation-induced water hammer in vertical geometry with RELAP5, WAHA and CODEX codes
Theme:	Thermal Hydraulics
Author(s):	Oleg Melikhov, Vladimir Melikhov, Yuriy Parfenov, Mikhail V. Davydov, Iztok Tiselj, Francesco D'Auria, Nikolaus Muellner
Contact :	Vladimir I. Melikhov
E-mail:	vladimir.melikhov@erec.ru
Address:	Electrogorsk Research & Engineering Centre on Nuclear Plants Safety 142530 Elektrogorsk
Country:	Russia

?ondensation-induced water hammer is a thermal-hydraulic phenomenon that occurs in fluid systems when a steam and subcooled water contact directly. Experimental and theoretical studies of this phenomenon in the vertical geometry have been carried out within the frame of the INTAS project 05-1000008-8086 "Condensation-induced water hammer in vertical vessels" by research teams from different institutes. The validation of WAHA code and CODEX codes was carried out on the basis of experimental data obtained at the small-scale test facility developed for investigation of water hammer in a vertical geometry. A test section of the facility is a vertical tube where overpressure and force of gravity accelerate a column of the subcooled water initially located at the upper section of the tube into the lower section filled with the vapor. The experimental data of 10 tests were used for the validation. In general, the calculation and experimental results are in a reasonable agreement for both codes. Code parameters which have a strong influence on the calculation results were identified within the frame of the sensitivity studies. The cross-verification of WAHA and CODEX codes with RELAP5 code was carried out for a pre-specified set of NPP operating conditions. The results of the cross-verification are presented in this paper.