Simulation of Loss-of-Flow Transient in a Radiant Steam Boiler with Relap5/Mod3.2

loss of feedwater accident is one of the frequently sever accidents in steam boiler facilities. It threatens the system structural integrity and generates serious hazards and economic loses. The safety analysis of the thermal installations, based extensively on the numeric simulation. The simulation analysis using realistic computer codes like Relap5/Mod3.2 will help understand steam boiler thermal-hydraulic behavior during normal and abnormal conditions. In this study, we are interested on the evaluation of the radiant steam boiler assessment and response to loss-of-feedwater accident. Pressure, temperature and flow rate profiles are presented in various steam boiler system components. The obtained results demonstrate the importance and capability of the Relap5/Mod3.2 code in the thermal-hydraulic analysis of the steam boiler facilities.

• A.L.Deghal.Cheridi
• A.Chaker
• A.Loubar

• Radiant steam boiler
• Relap5/Mod3.2 code system
• Steady-state simulation
• Transient simulation
• Loss of feedwateraccident

[1] H.Waletr, W.Linzer, "Investigation of the stability of a natural
circulation in two-pass boiler", Heat and Mass Transfer, Vol.42, pp.562-
565, 2006
[2] M.Pavlov & al, "Relap5/Mod3.2 analysis of natural circulation test at
Kozloduy NNP UNIT 6", Fifth International Informational Exchange
Forum, Russia, October 2000.
[3] T.V.Mull & al, "Numerical Simulation Models for a Modern boiler
Design, Power-Ge" International'96, Orlando, Florida, USA, December
4-9, 1996.
[4] R. C. Borges, F. D-Auria & A. C. M. Alvim, "RELAP5/MOD3.2 Post
Test Simulation and Accuracy Qualification of LOBI TEST A1-93",
Relap5 International Users Seminar, USA-Sept. 12-14 2000.
[5] Manuel technique d'exploitation de la Chaudière ABB ALSTOM.
[6] D.R.Tucakovic & al, "Thermal hydraulic analysis of a steam boiler with
rifled evaporating tubes", Applied Thermal Engineering, Vol.27, pp.509-
519, 2007
[7] D.W.Dick & al, "Boiler Failure Mechanisms", the 61st Annual
International Water Conference, Pittsburgh, PA (USA), Oct. 22-26,
2002.
[8] H.Kim, S.Choi, "A model on water level dynamics in natural circulation
drum type boilers," Heat and Mass Transfer, Vol.42, pp.786-796, 2005.
[9] R. C. Borges, F. D-Auria & A. C. M. Alvim, "RELAP5/MOD3.2 Post
Test Simulation and Accuracy Qualification of LOBI TEST A1-93",
Relap5 International Users Seminar, USA-Sept. 12-14, 2000.
[10] The RELAP5 Development Team, RELAP5/Mod3.2 Code Manuals1998
NUREG/CR-5535 Report, Vols. 1-5, Idaho National Engineering
Laboratory, March.
[11] A.L.Deghal.Cheridi, A.Chaker, "Radiant Steam Generator Simulation
Using Relap5/Mod3.2 Computer Code", 11th International Conference
Multiphase flow in industrial Plant, Palermo, Italy, September 7-10,
2008.
[12] A.Rahmani & al, "D-type steam boiler simulation using Relap5/Mod3.2
computer code", International Journal of Heat and Technology, vol.25,
N┬░2, pp.119-126, 2006.
[13] P.Grudev, M.pavlova, "Simulation of loss-of-flow transient in a VVER-
1000 nuclear power plant with Relap5/Mod3.2", Progress in Nuclear
Energy,Vol.45,N┬░.1,pp.1-10,2004