A case history of CFD support to Accelerator Driven System plant Vincent Moreau CRS4, Energy & Environment Program Luigi Mansani, Maurizio Petrazzini Ansaldo Nucleare ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

What is an Accelerator Driven System ? An Accelerator Driven System, or ADS, consists in a sub-critical nuclear fission reactor coupled with a proton accelerator by means of a target system. ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant THE EUROTRANS PROJECT The Integrated Project EUROTRANS, funded by the European Commission (FP6, 2006-2010) is aimed at providing: the advanced design of a multi purpose research oriented ADS, called XT-ADS (600 Mev, 80 MWth) The preliminary design of an industrial scale ADS, called EFIT (800 Mev, 400 MWth) ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant ENEA, Bologna Neutronics Ansaldo, Genoa coordination, design CRS4, Pula CFD ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT European Facility for Industrial Transmutation Beam power: 800 Mev Beam intensity: ~20 mA Plant power: ~400 MWth Primary coolant: pure lead Primary coolant flow rate: 36,000 kg/s Core inlet temperature: 400 C Core outlet temperature: 480 C Reactor vessel size: 10 m diameter, 12 m high ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT Ansaldo design (1/2) ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT 2D CFD simulation Bottom + Core + Inner Plenum Nominal power and flow rate Differentiated core porous resistance Objectives: Preliminary simulation for support to discussion Set up physical properties Get confident with object under study ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT 2D CFD simulation ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT 2D CFD simulation Effects: Withdraw from core CFD analysis (done by another partner ENEA, making also the core arrangement and the neutronic calculation) Separation of bottom and top concern Change of the bottom grid orientation Investigate on pump entrance flow ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

Change of the bottom grid ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant 3D CFD check ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant 3D CFD check ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant 3D CFD check ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

EFIT simplified inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

EFIT simplified inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

EFIT simplified inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

EFIT simplified inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

EFIT simplified inner plenum ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT Down-comer ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT Down-comer ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT Down-comer ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT Down-comer ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant EFIT Down-comer Before After After, After 3min transient ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant XT-ADS Beam power: 350 or 600 Mev Beam intensity: max 5 or 2.5 mA Plant power: ~70 MWth Primary coolant: Lead-Bismuth Eutectic Primary coolant flow rate: 6,000 kg/s Core inlet temperature: 300 C Core outlet temperature: 380 C Reactor vessel size: ~ 5 m diameter, 8 m high ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

Ansaldo design, strongly inspired from SCK-CEN Myrrha design XT-ADS Ansaldo design, strongly inspired from SCK-CEN Myrrha design ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant XT-ADS ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant XT-ADS ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant XT-ADS ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant XT-ADS ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant XT-ADS ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

XT-ADS: shut-down transient Extreme scenario Beam interrupted: core decay heat Pump stops in 3s SGU stops in 3s Internal DHR system fails Only external RVACS operative 20,000s of transient ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

XT-ADS: shut-down transient Initial condition ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

XT-ADS: shut-down transient First 50s ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

XT-ADS: shut-down transient Modified colour scales: from 50s to 20,000s ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

XT-ADS: shut-down transient Situation at time=20,000s ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

XT-ADS: shut-down transient ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

XT-ADS: shut-down transient ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

A case history of CFD support to ADS system plant Concluding words We have presented some situations in which CFD proved to be a useful support to the designer and led to design variants. The extensive use of “over-simplified but not rigid” treatment of pumps, heat exchangers, by-pass, core heat release allowed to investigate medium and large scale 3D behaviours in a rather consistent way. This work has been made possible because the designers and the CFD engineer took time to exchange information and motivation, both explaining and listening… More images and animations on: http://people.crs4.it/moreau/HTML/EUROTRANS/index_EUROTRANS.html ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant

Thank you for your attention ICONE 17, Brussels, July 13, 2009 A case history of CFD support to ADS system plant