Nuclear Energy for New Europe 2009

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No: 215

Conference: Nuclear Energy for New Europe 2009

Title: Containment Air Leakage Simulation with RELAP5/MOD3 Computer Code

Theme: Thermal Hydraulics

Author(s): Aljoša Šumlaj

Contact : Aljoša Šumlaj

E-mail: aljosa.sumlaj@nek.si

Address: Nuklearna elektrarna Krško
8270 Krško

Country: Slovenia

In order to proclaim NPP containment air tight, its leak rate needs to be below a certain value. This limiting value is often given at the containment design pressure conditions whereas Containment Leak Rate Tests are executed at a lower pressure. To determine leak rate limiting value at test pressure conditions, a simple RELAP5/MOD3 model is created, comprising single-volume as the containment, a valve element as leak opening and a time-dependent volume as the atmosphere. In the first simulation, equivalent size of the opening is determined by targeting the design leak rate at the design pressure. In the second simulation, this opening is utilized to determine the leak rate at test conditions. Moist air is used as a fluid and RELAP noncondensible option 6 is used to prescribe the initial conditions for single-volume element.

No:	215
Conference:	Nuclear Energy for New Europe 2009
Title:	Containment Air Leakage Simulation with RELAP5/MOD3 Computer Code
Theme:	Thermal Hydraulics
Author(s):	Aljoša Šumlaj
Contact :	Aljoša Šumlaj
E-mail:	aljosa.sumlaj@nek.si
Address:	Nuklearna elektrarna Krško 8270 Krško
Country:	Slovenia

In order to proclaim NPP containment air tight, its leak rate needs to be below a certain value. This limiting value is often given at the containment design pressure conditions whereas Containment Leak Rate Tests are executed at a lower pressure. To determine leak rate limiting value at test pressure conditions, a simple RELAP5/MOD3 model is created, comprising single-volume as the containment, a valve element as leak opening and a time-dependent volume as the atmosphere. In the first simulation, equivalent size of the opening is determined by targeting the design leak rate at the design pressure. In the second simulation, this opening is utilized to determine the leak rate at test conditions. Moist air is used as a fluid and RELAP noncondensible option 6 is used to prescribe the initial conditions for single-volume element.