PSA-HD Severe Accident Simulation using MAAP Code Overview

February 5, 2013

Steve Freel, COO

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• Severe accident simulation tool, with HMI, advanced 3D visualization and V&V

• Enables integration of MAAP* into full scope real-time simulators

• Enable to simulate entire plant of Multi-Unit • Open the “Black Box” for ease of use • Synchronization and repeatability • Interactive operations, simulation or analysis • Maintain MAAP code integrity and fidelity

Product Features

MAAP5.0 Note: *MAAP 5.0 was developed by the Electric Power Research Institute (EPRI). Purchasers of PSA-HD are first required to have a MAAP 5.0 license from EPRI. *EPRI (www.epri.com) conducts research and development relating to the generation, delivery and use of electricity for the benefit of the public. An independent, nonprofit organization, EPRI brings together its scientists and engineers as well as experts from academia and industry to help address challenges in electricity, including reliability, efficiency, health, safety and the environment. EPRI does not endorse any 3rd party products or services. Interested vendors may contact EPRI for a license to MAAP 5.0.”

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Basic Client-Server Structure

output

input

Client

Simulator Host Executive

(GSE or non-GSE)

HD Client Executive #1

Server

Client C Module

Server input/output Status request

control

Customized Plug-in

interface Client

Standard HD Server

Configuration

PSA-HD Platform Client and Server Structure

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PSA-HD Repeatability

PSA-HD has significantly improved the

repeatability of the original MAAP code

MAAP Restart Repeatability Test PSA-HD Reset Repeatability Test

Output Difference=0.0

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Main HD Simulation Processes

freeze

Create restart or update input decks : Pygi

Start HD Executive

Read Input or Restart Decks

Initialize 3rd Party Engineering Code

Run a Frame

Interactive User Actions

HD IC Files

reset

snap

End

Text Edit Output

Input or Restart File

Start 3rd Party Engineering Code

batch Job

Read Input or Restart Decks

Initialize 3rd Party Engineering Code

Run the Whole Job

End

Scheduled Time end

exit

3rd Part Engineering

Code

Scheduled

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JDB Model Trending & Control

Simulation Control

Command Window

Trend Plotting

Code variable monitor & control

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Dynamic Graphic Display: Core

Unit 1 Unit 2

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Containment Dynamic Display

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SFP DYNAMIC DISPLAY

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Dose Dynamic Display

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Auxiliary Building MAAP5

Spent Fuel Pool

Unit 2

Containment MAAP5

RCS TH

Code/ MAAP5

SG

TH Code/ MAAP5

Core S3R

Unit 1

Containment MAAP5

RCS TH

Code/ MAAP5

SG

TH Code/ MAAP5

Core S3R

In-plant DOSE simulation

In-plant DOSE simulation

Ex-plant DOSE Simulation

MAAP5

A Demo on a 2-Unit Plant of Westinghouse 4-Loop PWR

PSA-HD in Full-scope Simulator

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Multiple Client-Server Structure

JADE Operation Station DCS-Like HMI

Animation, Soft Panels,

Interface Simulation Control

HD MAAP Server 1 Unit 1 (RCS, SG,

Containment/DOSE)

HD MAAP Server 2 Unit 2 (RCS, SG,

Containment/DOSE)

HD MAAP Server 3 Aux Building (Spent Fuel

Pool, DOSE)

JADE Dashboard (JDB) HD server

Graphical User Interface Interactive Control,

Monitor, V&V

PSA-HD Client

PSA-HD Platform Configuration for plant site with 2-Unit Westinghouse 4-Loop PWR

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Core Mass: Unit 1

core molten relocation to vessel lower head started.

Core starts to melt.

Reactor vessel failed by molten ejection to containment.

Severe Accident Scenario in Unit 1

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H2 Generation

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Ex-Plant Dose

Point 1 Distance: 100 m Point 2 Distance: 200 m

Total Ex-plant Dose

Total ex-plant dose considering multiple radioactive leakages from different units/buildings are simulated in the Aux Building executive.

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PSA-HD in Full-scope Simulator

Timeline 0 Min. ~60 Min. 3 Hrs. 20

Min. 5 Hrs. 30

Min.

Scenario Steady-state LOCA, code

transition

LOCA, Core melt-down

LOCA, Vessel failed

MAAP Server #1

Unit #1 RCS/SG

TH Code

Transition MAAP5.0

Unit #1 Containment

MAAP5.0

MAAP Server #2

Shared Aux. Building (w/ SFP)

MAAP5.0

Simulator BOP GSE JTopmeret

Neutronics Studsvik S3R

PSA-HD Integrated with Full-scope Simulator of Westinghouse 4-loop PWR

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Multi-Units Desktop Application

PSA-HD Platform is Flexible & Ideal for Multi-Units Configuration

4-unit CANDU NPP

Shared Building/Components

Unit #1

Unit #2

Unit #3

Unit #4

Server #1 Server #2 Server #3 Server #4

Server #5

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SAMG assisted by PSA-HD

• SAMG Verification − Evaluate standards & criteria to be technically & literally

completed − Applicability of generic SAMGs to specific plant

• SAMG Validation − Evaluate the correct use and feasibility for the personnel (MCR,

TSC) involved in the SAM based on scenarios − MAAP code simulates “Validation scenario” to provide reference

sequences & evaluate the effectiveness of SAMG − Discrepancies or deviations to be identified for improvement

• Training Program − Phenomenology and events sequence concerning to severe

accident − Transition between EOPs & SAMGs − MCR & TSC exercise & communication − Instrumentation performance

PSA-HD provides Variety & Reality for SAMGs.

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SAMG assisted by PSA-HD

Full-scope Simulator PSA-HD

NOP EOP SAMG

Emergency Director (Plant Manager)

Local Field Personnel

Main Control Room Technical Support Center

Radiological Center

Postulated Actions Validation

Realistic Training Realistic Training

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PSA-HD Platform Benefits

− Parallel simulation to the entire multi-unit plant site;

− Synchronized simulation between multiple systems & components;

− Flexible configuration through Client-server structure;

− Open the “black box” to access code internal variables;

− User friendly 3-D HMI for dynamic display scenarios;

− HMI Built-in features for plotting, V&V, risk analysis, multi-languages;

− User’s interactive actions easily available through HMI;

− Significantly improved code repeatability;

− Ready to integrate with full-scope simulator;

− SAMG Verification & Validation and Training.

Questions?