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Validation of TRACE Code against ROSA/LSTF Test for SBLOCA of Pressure Vessel Upper-Head Small Break
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

OECD/NEA ROSA/LSTF project tests are performed on the Large Scale Test Facility (LSTF). LSTF is a full-height, full-pressure and 1/48 volumetrically-scaled two-loop system which aims to simulate Japanese Tsuruga-2 Westinghouse-type 4-loop PWR. ROSA-V Test 6-1 simulates a pressure vessel (PV) upper-head small break loss-of-coolant accident (SBLOCA) with a break size equivalent to 1.9% of the volumetrically scaled cross-sectional area of the reference PWR cold leg.The main objective of present thesis is to build a TRACE calculation model for simulating thermal hydraulic behaviors in LSTF and PV upper-head SBLOCA, so as to assess different modeling options and parameters of TRACE code. The results show that TRACE code well reproduce the complex physical phenomena involved in this type of SBLOCA scenarios. Almost all the events in the experiment are well predicted by the model based on TRACE code. In addition, the sensitivity of different models and parameters are investigated. For example, the code slightly overestimates the break mass flow from upper head which affects the accuracy of the results significantly. The rising of core exit temperature (CET) is significantly influenced by the flow area of leakage between downcomer and hot leg. Besides, the effect of the break location, low pressure injection system (LPIS) and accumulator setup are also studied.

Place, publisher, year, edition, pages
2012. , 65 p.
Series
Trita-FYS, ISSN 0280-316X ; 2012:49
Keyword [en]
SBLOCA, LSTF, TRACE, thermal-hydraulics transient, safety analysis
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-95745ISRN: KTH/FYS/--12:49—SEOAI: oai:DiVA.org:kth-95745DiVA: diva2:529136
Subject / course
Reactor Safety
Educational program
Master of Science - Engineeering Physics
Presentation
2012-05-28, FA31, Roslagstullsbacken 21, Stockholm, 14:45 (English)
Uppsok
Physics, Chemistry, Mathematics
Supervisors
Examiners
Available from: 2012-05-30 Created: 2012-05-29 Last updated: 2012-05-30Bibliographically approved

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