RELAP5 2011 User Workshop Outline

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Workshop Objective

RELAP5/MOD3.3 is a thermal-hydraulic systems analysis code developed by the Nuclear Regulatory Commission (NRC) for nuclear reactor safety analysis applications. The workshop is designed to provide a basic understanding of the RELAP5/MOD3.3 code and the approach to system modeling. The course is directed toward beginner to intermediate RELAP5 users. The course will provide a familiarization with the general use of RELAP5/MOD3.3, an understanding of the basic RELAP5 modeling principles, component modeling overview, input development, code execution and reviewing results. The course will also provide views on modeling techniques, balancing system components, code applications and the existing code assessment base. There will be a balance of lectures and discussions along with hands-on modeling exercises for a simple loop and a typical Pressurized Water Reactor (PWR) reactor.

RELAP5/MOD3.3 Version

The course discussions and hands-on exercises will be centered on the latest RELAP5/MOD3.3 version (Patch 4).

Course Outline

Course Instructors: Mark Bolander and Robert Beaton

Day 1: June 7, 2011

Overview of the RELAP5 Code and Approach to System Modeling
Overview of RELAP5 Components, Part 1
Hands-On Exercise: Develop Simple Model for Core Region and Steam Generator (SG) Primary System
Overview of RELAP5 Components, Part 2
Hands-On Exercise: Develop Simple Model for Hot/Cold Leg Piping and Pump
Overview of RELAP5 Components, Part 3
Hands-On Exercise: Develop Simple Model for Core Fuel and Steam Generator (SG) Secondary System
Overview of RELAP5 Components, Part 4
Hands-On Exercise: Add Boundary Conditions to the Simple Model

Job Submission
Plot Variables
Plotting Results

Hands-On Exercise: Combine Model Features Together, Execute the Problem and View Results

Checking Model Input
Debugging Input Errors

Day 2: June 8, 2011

RELAP5 Component Modeling Overview and Modeling Techniques
- Pipe Component Details
- Heat Structure Details
- RELAP5 Special Options
- Accumulator Component
RELAP5 Base System Model Description
- Introduction to PWR Plant System Model Used in Exercises
Extent of Systems Included in Model
Modeling Guidelines
Nodalization
Option Selections
Steady-State Initialization Techniques
Plant System Model Full-Power Initial Steady State Exercise

Debugging Input Errors
Plot Variables and Plotting
Viewing Calculated Output

RELAP5 Component Modeling Overview and Modeling Techniques (continued)
- Valve Component Details
- Use of Trips for Controlling Model Features
- Working With RELAP5 Control Variables
- Pump Component Details
Hands-On Exercise: Add Pressurizer Heater and Spray Systems to the Base Model and Run Final Steady State

Add Heat Structure and Power Source
Add Control Systems
Run Steady State and Verify Model Performs as Intended
Plot Variables and Plotting
Viewing Calculated Output
Importing Initial Conditions

Day 3: June 9, 2011

Code Applications and Issues
- Critically Reviewing Code Results
- Data Available from Printed Major Edit Output
- Timestep Control Information
- Energy and Mass Balances
- Mass Error
- Convergence (Time Steps, Nodalization)
- Recirculating Flow Modeling Issues
- Flow Oscillations
- Over Prediction of Condensation
- Break Flow
Plant System Model Transient Exercise: Small Cold Leg Break

Break Modeling
Restarts
Set Up and Run Transient Calculation
Analyzing Results

Balancing Steam Generator Models
Hands-On Exercise Using Steam Generator from the Base System Model

Techniques for Balancing SG Model Performance
Plant and Design Data Quality Issues
Important Parameters
Model Limitations, Compromises and Adjustments
Methods, Boundary Conditions and Expectations

RELAP5 Code Applicability Issues and Existing Code Assessment Base
- Summary of Existing RELAP5/MOD3.3 Patch 4 Assessment Base

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