NUREG/CR-7164, Cross Section Generation Guidelines for TRACE-PARCS

................................................................................................................................. iii TABLE OF CONTENTS ................................................................................................................ v LIST OF FIGURES ..................................................................................................................... vii LIST OF TABLES ......................................................................................................................... ix ACRONYMS AND ABBREVIATIONS .......................................................................................... xi 1.0 INTRODUCTION ................................................................................................................... 1 2.0 FUEL SPECIFICATIONS FOR THIS STUDY ........................................................................ 3 2.1. SPECIFICATIONS OF PEACH BOTTOM TYPE 3C FUEL ............................................ 3 2.2. SPECIFICATIONS OF PMAXS STRUCTURE ............................................................... 4 2.3. SPECIFICATIONS OF LATTICE CODES ...................................................................... 4 3.0 COMPARISONS OF CROSS SECTION SETS ..................................................................... 7 3.1. COMPARISONS OF CROSS SECTIONS...................................................................... 7 3.2. BENCHMARK BETWEEN TRITON AND KENO .......................................................... 11 3.3. COMPARISONS OF KINETICS PARAMETERS ......................................................... 11 3.3.1. 1/v .......................................................................................................................... 11 3.3.2. βeff .......................................................................................................................... 12 4.0 SENSITIVITY ANALYSIS OF CROSS SECTIONS ............................................................. 17 4.1. DC HISTORY EFFECTS .............................................................................................. 17 4.1.1. Results of Single CHAN Model ............................................................................. 21 4.1.2. Results of Oskarshamn Core-wide Stability .......................................................... 22 4.1.3. Results of Ringhals Core-wide Stability ................................................................ 23 4.1.4. Conclusion of DC History Effects .......................................................................... 24 4.2. DC BRANCH EFFECTS ............................................................................................... 24 4.2.1. Results for Single CHAN Model ............................................................................ 25 4.2.2. Results for Oskarshamn Core-wide Stability ......................................................... 27 4.2.3. Results for Ringhals Core-wide Stability ............................................................... 28 4.2.4. 4.2.4 Conclusions of DC Branch Effects ............................................................... 29 5.0 EFFECTIVE DELAYED NEUTRON FRACTION ................................................................. 31 5.1. DEFINITION OF βeff ...................................................................................................... 31 5.2. CALCULATION OF βeff USING A SINGLE-ASSEMBLY LATTICE .............................. 31 5.3. PHYSICAL DESCRIPTION OF THE PHENOMENA .................................................... 32 5.4. NUMERICAL SIMULATION ......................................................................................... 35 6.0 CODE-TO-CODE COMPARISON ....................................................................................... 39