Nuclear Design Feasibility of the Soluble Boron Free PWR Core

  • 발행 : 1998.08.01

초록

A nuclear design feasibility of soluble boron free(SBF core for the medium-sized(600MWe) PWR was investigated. The result conformed that soluble boron free operation could be performed by using current PWR proven technologies. Westinghouse advanced reactor, AP-600 was chosen as a design prototype. Design modification was applied for the assembly design with burnable poison and control rod absorber material. In order to control excess reactivity, large amount of gadolinia integral burnable poison rods were used and B4C was used as a control rod absorber material. For control of bottom shift axial power shape due to high temperature feedback in SBF core, axial zoning of burnable poison was applied to the fuel assemblies design. The combination of enrichment and rod number zoning for burnable poison could make an excess reactivity swing flat within around 1% and these also led effective control on axial power offset and peak pin power, The safety assessment of the designed core was peformed by the calculation of MTC, FTC and shutdown margin. MTC in designed SBF core was greater around 6 times than one of Ulchin unit 3&4. Utilization of enriched BIO(up to 50w1o) in B4C shutdown control rods provided enough shutdown margin as well as subcriticality at cold refueling condition.

키워드

참고문헌

  1. Nucl. Tech. v.75 Substitution of the Solube Boron Reactivity Control System of a PWR by Gadolinium Burnable Poisons Alex Galperin;Meir Segev
  2. EPRI Report RP-2614-24 Elimination of Soluble Boron for a New PWR Design W. R. Sugnet;J.M. Yedidia
  3. EPRI Report Soluble Boron Free Passive PWR Study Phase II Summary Report W.R. Sugnet;J.M. Yedidia
  4. AP-600 Standard Safety Analysis Report
  5. STUDSVIK/NFA-89/3, Studsvik of America CASMO-3, A Fuel Assembly Burnup Program User's Manual M. Edenius;B. H. Forssen
  6. INEL EGG-NRE-11406 NESTLE: A Few-Group Neutron Diffusion Equation Solver Utilizing the Nodal Expansion Method for Eigenvalue, Adjoint, Fixed-Source Steady-State and Transient Problem P. J. Turinsky(et al.)
  7. KEPRI, KRC-92N-J04 Optimization of Burnable Poison Application Strategy S. H. Lee(et al.)
  8. KAERI, KAERI/TR-766/96 A Study on Nuclear Characteristics of Burnable Absorbers in Hexagonal Fuel Assembly T. K. Kim(et al.)
  9. ULCHIN 3&4 PSAR Korea Electric Power Corporation
  10. Proc. of the Korean Nuclear Society Autumn Mtg. v.1 The Development of Power Control Logic for Load Following Operation in SBFO J. U. Jang;U. C. Lee
  11. KAERI, KAERI/TR-560/95 MASTER(Multi-purpose Analyzer for Static and Transient Effects of Reactors) user's manual C. H. Lee(et al.)