Scaling Methodology for ATTF the Integral Test Facility of AHWR
Mukesh Kumara, Vikas Jainb, A. K. Nayakc, P. K. Vijayan and D. Saha
Reactor Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
amukeshd@barc.gov.in
bjainv@barc.gov.in
carunths@barc.gov.in
ABSTRACT
The Advanced Heavy Water Reactor (AHWR) being designed in India is a 920 MWth pressure-tube type boiling light water cooled and heavy water moderated reactor. AHWR is an innovative reactor employing many passive features. AHWR Thermal Hydraulic Test Facility (ATTF), a scaled experimental facility that simulates the thermal-hydraulic behaviour of main heat transport system and ECCS is designed.
This paper deals with the scaling methodology of the facility ATTF. The thermal-hydraulic phenomenon of the interest in the facility can be categorized as global, local and boundary phenomena. A good scaling philosophy must retain the entire phenomenon in the model qualitatively and scaled down quantitatively from the prototype. For that purpose global scaling is based on Power to Volume ratio. This philosophy is based on maintaining the same pressure, temperature with same working fluid. Main advantage of this scaling approach is that it preserves the time scales which are very crucial for the simulation of transient and accident conditions to assess the performance of safety systems.
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