Takaharu FUKUZAKI, Dr. Eng. Professor, Department of Nuclear Engineering and Management, Graduate School of Engineering, The University of Tokyo 7-3-1Hongo, Bunkyo-ku, Tokyo, , JAPAN Technology Innovation in Instrumentation and Control System for Nuclear Power Plant 1

1. Introduction 2. Core Operation and Management System (COMS) for Nuclear Power Plant 3. Computer-Based Console for Nuclear Power Plant Trial (COCONUT) 4. Lessons Learned from R&D Experience 5. Conclusion Contents 2

Introduction BWR Core Performance Calculation System [BWR: Boiling Water Reactor] On-line monitoring of power distribution in reactor core by physical-model-based simulation program World leading & EPRI collaboration Achievement #1 3

Introduction ABWR Instrumentation and Control System [ABWR: Advanced BWR] Enlargement of automatic operation Digitalization of control console One-man control prototype console Achievement #2 4

Core Performance Calculation Program Constitution 5

Core Performance Calculation Program Flowchart and Models 6

Core Performance Calculation Program Adaptive capability 7

Core Performance Calculation Program Parameter optimization 8

Core Performance Calculation Program Power correction factor calculation 9

Core Performance Calculation Program Control rod dependent power correction 10

Core Performance Calculation Program Predicting mode calculation 11

Core Performance Calculation Program Evaluation of thermal power prediction 12

Core Performance Calculation Program Evaluation of power distribution 13

14 Transition of Man-Machine Interfaces in Main Control Room Conventional ImprovedAdvanced (Monitoring)(Decision)(Operation) (Monitoring)(Decision) Operator Conventional I&C Advanced Device Plant Process Enlarged Automation Primary Sys. Automation

15 NUCAMM-90 (NUCAMM: Nuclear Power Plant Complex with Advanced Man-Machine Interface)

16 Selection of Important Alarms during Plant Transient

17 Systematic Problem Solving Infinite Final Solution Current Stage 1st Stage 2nd Stage Current Stage Infinite Final Solution (F-1)th Stage Infinite Final Solution (F-2)th Stage 1st Stage You might lose the way. You might be embarrassed by moving targets. Which approach is preferable ? You might be required a little bit more effort and imagination. You can easily find the way.

18 Systematic Problem Solving Technology Evolution S-curve Every technology evolutes in S-curve. Technology transfer is inevitable to reach higher degree. Focus of invention is dependent on S-curve position. To minimize cost To increase reliability To increase efficiency To increase performance To operate stably To be operable Degree of ideality Time (1) Idea (2) Birth (3) Infant / Growth (4) Mature (5) Retirement

Two achievements were introduced: BWR Core Performance Calculation System for on-line monitoring of power distribution in reactor core by physical-model-based simulation program ABWR Instrumentation and Control System for enlargement of automatic operation, and digitalization of control console Conclusion 19 Two approaches of Systematic Problem Solving in Technology Innovation were proposed: to search from GOAL to START to recognize Technology Evolution S-curve