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Simulation of Coolant Temperature Variation in VVER-1000 Reactor Using Temperature Noise Analysis

Nourollahi, Reza | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44088 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Vossoughi, Nasser
  7. Abstract:
  8. Temperature noise phenomenon in nuclear reactors results to the vital information about the system. This phenomenon may originate from coolant inlet temperature fluctuations, coolant fluid velocity fluctuations or the reactor power fluctuations in PWR reactors. Diagnosis of such temperature noise sources shall improve the reactor control and protection.The present research aims to develop a software to model the temperature noise in the axial direction of a single channel comprises of fuel rod and the associated coolant to recognize the type of temperature noise sources. In this regard, research stages are as follows: first the temperature noise caused by three conventional noise sources in PWR reactor cores namely coolant inlet temperature fluctuations, coolant inlet velocity fluctuations and inserting an external reactivity is simulated. Two software namely, STH and NTH, are developed besides presenting the fuel, fluid and their coupled thermo-hydraulic equations and solving the integral equations. STH and NTH software solve the steady state and noise equations respectively. Different scenarios have been investigated to benchmark the software accuracy. A library is developed for identification of the type and size of temperature noise sources using the developed program. Noise source diagnosis is performed using the least square method and the developed library. Results show the accuracy of proposed method and the library in temperature noise source identification
  9. Keywords:
  10. Temperature Noise ; Pressurized Water Reactor (PWR,WWER) ; Temperature Noise Identification

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