scorpio-vver with advanced prediction capabilities

SCORPIO-VVER Core Monitoring

and Surveillance System

with Advanced Capabilities

Jozef Molnar, Radim VockaNuclear Research Institute Rez plc

NUSIM 201028th – 29th April 2010

Častá – Papiernička, Slovakia

Nuclear Research Institute Řež plc

Czech Republic

2

SCORPIO-VVER The Developers

The original version of the SCORPIO system was developed for the western type of PWR reactors.

long history, starting from 1987 (Ringhals 2),

more than 9 PWR units (Sweden, UK, USA).

The first version of the SCORPIO-VVER Core Monitoring System for Dukovany NPP (VVER-440 type of reactor, Czech Republic) was developed in 1998 in co-operation between:

IFE Halden, Norway,

Nuclear Research Institute Řež plc, Czech Republic

Škoda JS a.s., Czech Republic

Chemcomex Praha a.s., Czech Republic

For SCORPIO-VVER implementation at Bohunice NPP in Slovakia (2001) the system was enhanced with startup module KRITEX in co-operation with:

VUJE a.s., Slovak Republic

Nuclear Research Institute Řež plcNuclear Research Institute Řež plc

Czech Republic

3

SCORPIO-VVER basisSurveillance of reactor CORe by PIcture On-line display

consists of autonomous modules,

for communications the Software Bus

communication package is used,

the MMI is developed using the

ProcSee GUI Management System,

support different user logins with

difference rights and presented

information details,

uses the plant’s own in-core and ex-

core measurements,

servers with more then 74thousand

parameters on the system output.


Czech Republic

The SCORPIO-VVER core monitoring

system:

PCI-Margin CalculationPES(1.4)

PCI-Margin CalculationPES(1.4)

PCI-Margin CalculationPES

(Predictive) (2.4)

PCI-Margin CalculationPES

(Predictive) (2.4)

LimitChecking andThermal Margin Calc.

(Predictive) (2.3)

LimitChecking andThermal Margin Calc.

(Predictive) (2.3)

LimitChecking andThermal MarginCalculation(1.3)

LimitChecking andThermal MarginCalculation(1.3)

3D Power DistributionDetermination

(1.2)

3DPower DistributionDetermination

(1.2)Predictive Simulator

(2.1)

Predictive Simulator(2.1)

Strategy Generator(2.2)

Strategy Generator(2.2)

Plant Measurements InputData(1.1A, 1.1B)

Plant Measurements InputData(1.1A, 1.1B)

Core Follow System Core Predictive System

Logging(1.6)

Logging(1.6)

Primary CoolantMonitoring, PEPA(Predictive) (2.5)

Primary CoolantMonitoring, PEPA(Predictive) (2.5)

ModuleAdministatorModuleAdministator

MMIOperator/Reactor Physicist/System Supervisor

MMIOperator/Reactor Physicist/System Supervisor

Primary CoolantMonitoring, PEPA

(1.5)

Primary CoolantMonitoring, PEPA

(1.5)

Entry

Reloaddata

Reactivity MeasurementModule , KRITEX

(1.7)

Reactivity MeasurementModule , KRITEX

(1.7)

Reload TransitionModule , RELOAD

(2.6)

Reload TransitionModule , RELOAD

(2.6)

4

SCORPIO-VVER basisSurveillance of reactor CORe by PIcture On-line display

The system operates in two modes:

the core follow mode - the present core state is

evaluated by a method combining the instrumentation

signals and the theoretical calculation. The operator

obtains relevant information on core status through

the MMI in the form of well arranged screens

containing trend curves, core map pictures, diagrams

and tables displaying relevant information on the core

state including margins to Technical Specifications.

the predictive mode - the operator can visualize the

core characteristics during the transients forecasted

for coming hours or days. Quick forecasts realized by

the strategy generator could be deeply analyzed by

the predictive simulator. Similarly as in the core follow

mode, characteristics of the evaluated states can be

compared against Technical Specifications, and the

predicted behaviour of the core can be analyzed

through the number of dedicated screens.


Czech Republic

5

SCORPIO-VVER basisMain features of the system

Maintaining the communication with plant data sources and data acquisition.

Validation of plant measurements and identification of sensor failures.

Calibration of temperature measurement sensor and evaluation of isothermal state.

On-line 3D power distribution calculation with pin power reconstruction, based on the validated outlet temperature from thermocouples, SPND measurements and from the results of core Simulator.

On-line core simulation based on two-group 3D coarse mesh calculation code (based on Moby-Dick code).

Limit checking and thermal margin calculation allowing for surveillance of VVER core limits such as DNBR, Sub-cooling margin, FdH and other peeking factors, etc.

SPND monitoring, evaluation, interpretation and transformation to linear power.


Czech Republic

The SCORPIO-VVER system includes following main features:

6

SCORPIO-VVER basisMain features of the system cont.

Integrated module for monitoring fuel performance, conditional power distribution.

Integrated module for monitoring of coolant activity for identification of fuel failures.

Convenient monitoring and prediction of approach to criticality during reactor start-up.

Predictive capabilities and strategy planning, offering the possibility to check the consequences of operational maneuvers in advance, prediction of critical parameters and end of fuel cycle detection, etc.

Automated transition between cycles (fuel reload).

Logging functions with archive for all calculated and main measured data.

User definable printer output for protocols and forms.


Czech Republic

7

SCORPIO-VVERImplementation and upgrade history

First implementation at Dukovany NPP in Czech Republic:

completed in 1998, migrated to all 4 units.

Dukovany’s short upgrade history:

2000, Upgrade-1, system maintenance and system tuning.

2003, Upgrade-2, adjusting the physical modules to EDU’s requirements.

2004, Upgrade-3, adaptation to use the Gd2 fuel type, moving to 42 axial layers.

2005, Upgarde-4, system adaptation to work with the upgraded I&C system.

2007- 12/2009, Upgrade-5, improvements in operation support tools, implementation of SPNDs to the 3D Power Reconstruction, support of new GD2+ and Gd2M fuel, support the up-rated reactor thermal power, upgrade of the system HW.

First implementation at Bohunice NPP V2 in Slovak Republic:

completed in 2001, migrated to 3. and 4. unit.

Bohunice’s short upgrade history:

2006, Upgrade-1, adaptation to use the Gd2 fuel type, moving to 42 axial layers, improvements in SG, implementation of online shape function generation.

2008-6/2009, Upgrade-2, adaptation to the new I&C, improvements in limit checking (online SDM calculation) and 3D Power Reconstruction method, improvements in Strategy Generator, support the up-rated reactor thermal power.


Czech Republic

8

SCORPIO-VVER upgrades: The most important upgrade features

The most important improvements in the area of neutron physics, core

thermal analysis and operation support are:


Czech Republic

Moving to the 42 axial nodes across the whole

system (2004).

Implementation of new cross section library to

support mixed reactor core with differences in

axial geometry of used fuel types and

enhancement of Core Simulator boundary

conditions model, to properly address the “wild”

geometry in axial direction (2004).

Adjusting the thermohydraulic and neutron-

physical models regarding to the Gd2 fuel needs

(2004).

Support up to 5 types of FAs and 2 types of SPND

(Posit, IST) (2004).

Extension of form functions for pin-wise

reconstruction to improve pin-power prediction in

control rod coupler region (2004).

9

SCORPIO-VVER upgrades: The most important upgrade features cont.


Czech Republic

System adaptation to the new upgraded digital

I&C unit system (2005).

Integration of the SCORPIO-VVER system and

it’s workstation into the plant redundant in-core

system (2005).

Implementation of new On-Line form function

generation to module RECON (2006).

New design of the Strategy Generator with

advanced predictions (2007).

Adaptation of the system to support the new up-

rated reactor thermal power (2008).

Adding new online SDM calculation function into

to system (2008).

Implementation of the new 3D power

reconstruction with SPND interpretation (2009).

Extending the limit checking to the “full core”

checking (2009).

10

SCORPIO-VVER upgrades: The most important upgrade features cont.


Czech Republic

The control of margins to

the technical spec.:

Extended to full core – all

FA is controlled

individually in core

The limits are definable up

to 59 FA (1/6 symmetry)

4 limited parameters are

controlled – Kr, qlin, Tout-fa,

dTfa

2 additional parameters

are monitored – dTsat,

DNBR

New MMI are developed

to present the limited and

controlled parameters in

core.

11

SCORPIO-VVERFuture challenges and plans


Czech Republic

2011-2012 Planned Upgrade 3 for Bohunice NPP (Slovak republic):

system modification to support for new fuel types,

enhancements in limit checking and control,

improving the system redundancy and system integration into to the plant in-core

system.

Conquering of new territorial:

Adaptation and implementation of the SCORPIO-VVER Core Surveillance and

Core Monitoring System to the Reactor Training Simulator (full-scope simulator)

for reactor physicist in Slovak Republic.

12

SCORPIO-VVERExperiences and support


Czech Republic

More than 12 years of operation history:

on 6 unit of VVER-440 type of reactors,

at two different NPPs,

in two different countries,

with different regulatory bodies for nuclear safety,

helps to the SCORPIO-VVER developer team put the system to very high level of

quality, accuracy and reliability.

Based on more than 12 years of operation experience:

The system developer team is ready to respond to all needs of the NPP’s, solve

the difficulties and answer all questions in local language of NPP operators.

All system documentations and user guides are maintained in 3 different

languages: English, Czech and Slovak and the team ready to support other

languages too.

13

SCORPIO-VVER Conclusions


Czech Republic

Since the first installation the SCORPIO-VVER system has a remarkable operating history and experience.

The SCORPIO-VVER core monitoring system with its flexible and modular framework successfully responses to the plant operating needs and advances in nuclear fuel cycle strategies and fuel design.

Modular framework allows for easy modifications of the system and implementation of new methods in physical modules.

Even if the system is installed only on VVER-440 reactors, it could be adapted for needs of other VVER type of reactors and to needs of educations and training centers too.

Nuclear Research Institute Řež plc

Czech Republic

[email protected]

scorpio-vver with advanced prediction capabilities

Documents