To be able to correctly analyze an RCS Depressurization or Loss of Flow accident with no reactor trip, the Westinghouse 3D Transient Neutronics tool RAVE™ was used. Plants which utilize all-digital Instrumentation and Control (I&C) systems may be required to consider a complete failure of the digital protection system. A backup analog system is provided in the event of a failure of the digital system; however the backup analog systems do not carry all safety trip signals. Therefore, it is postulated that the plant might experience an accident event in which no immediate trip signal is generated and protection would rely on operator action. To allow adequate time for the operator to recognize the malfunction and take action to manually trip the plant, it is assumed that operator action will not occur for ten minutes from the initiation of the transient. These kinds of transients may be analyzed with point kinetic transient codes; however, due to the lack of 3D neutronic feedback with a core height dependent moderator temperature coefficient and its effect on the axial and radial power distributions, it may not be possible to show that Departure from Nucleate Boiling (DNB) does not occur. Using 3D Neutronic transient analyses methods (RAVE™), it was shown that neither of these transients (RCS Depressurization or Loss of Flow) would generate DNB violations, even though the point kinetics version is showing the opposite.
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16th International Conference on Nuclear Engineering
May 11–15, 2008
Orlando, Florida, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-4815-9
PROCEEDINGS PAPER
RCS Depressurization and Loss of Flow No Trip 3D Neutronic Transient Analyses Available to Purchase
Cenk Gu¨ler,
Cenk Gu¨ler
Westinghouse Electric Company, Monroeville, PA
Search for other works by this author on:
Daniel H. Risher
Daniel H. Risher
Westinghouse Electric Company, Monroeville, PA
Search for other works by this author on:
Cenk Gu¨ler
Westinghouse Electric Company, Monroeville, PA
Daniel H. Risher
Westinghouse Electric Company, Monroeville, PA
Paper No:
ICONE16-48891, pp. 583-588; 6 pages
Published Online:
June 24, 2009
Citation
Gu¨ler, C, & Risher, DH. "RCS Depressurization and Loss of Flow No Trip 3D Neutronic Transient Analyses." Proceedings of the 16th International Conference on Nuclear Engineering. Volume 2: Fuel Cycle and High Level Waste Management; Computational Fluid Dynamics, Neutronics Methods and Coupled Codes; Student Paper Competition. Orlando, Florida, USA. May 11–15, 2008. pp. 583-588. ASME. https://doi.org/10.1115/ICONE16-48891
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