NDLI: On the MEGAPIE Target Thermal Hydraulics: A RELAP5 Analysis

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Leung, W. H.
Copyright Year	2004
Abstract	A new type of liquid-metal target is designed for the Spallation Neutron Source in PSI. LBE is selected to be the target material and the primary coolant as well. RELAP5/MOD 3.2 is used to analyze the system thermal hydraulics. The nominal conditions are chosen based on temperature constraints from the design assessments. The steady state results are in the proximity of the design specifications and the heat removal capacity is adequately deployed. The normal thermal hydraulic transients, namely the proton beam and beam interrupt, are studied. A basic PID (Proportional, Integral, Derivative) control is implemented in the RELAP5 for regulating the target temperature. It is found that the control chain works very well for the beam trip in limiting the temperature fluctuations. In a beam interrupt, the proton beam is completely turned off without recovering. The transition from full power to hot-standby is quite smooth, but it becomes oscillatory in the long run due to the timelags in the cooling loops’ responses. An off normal case of target main coolant trip has also been studied. Without the main pump, the target can still be operated in the natural circulation mode, and the control can cope with the normal beam transients and restarting the target from hot standby.
Sponsorship	Nuclear Engineering Division
Starting Page	787
Ending Page	797
Page Count	11
File Format	PDF
ISBN	0791846881
DOI	10.1115/ICONE12-49378
e-ISBN	0791837351
Volume Number	12th International Conference on Nuclear Engineering, Volume 2
Conference Proceedings	12th International Conference on Nuclear Engineering
Language	English
Publisher Date	2004-04-25
Publisher Place	Arlington, Virginia, USA
Access Restriction	Subscribed
Subject Keyword	Chain Temperature Cooling Neutron sources Spallation (nuclear physics) Liquid metals Steady state Transients (dynamics) Design Hydraulic transients Heat Pumps Fluctuations (physics) Coolants Thermal hydraulics Proton beams
Content Type	Text
Resource Type	Article

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