07/10/2015 Version 0.0 1 - Massachusetts Institute of ...web.mit.edu/NRL/www/TRTR 2015 Editing...

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Radiation. Safety.

Upgrade Considerations of Replacing

Aging Neutron Flux Instrumentation

TRTR 2015 ANNUAL MEETING Presented by Ewald LIEBHART (Mirion)

Brewster (MA) / Oct. 5, 2015

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Table of contents

Standard Neutron Flux Monitoring Systems (NFMS) Introduction proTK™

Configurations of the Digital, Modular proTK™ Examples with various requirements/degrees of complexity

Summary / Conclusion

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Table of contents


Configure the Digital, Modular proTK™ Examples with various requirements/degrees of complexity


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proTK™ NFMS - Applications in PWRs & Research Reactors

Neutron Flux Range Code Detector Signal

Processing

Electronics

Quantities Position Type

Start-up

Range

Pulse

Range SRM

Ex-core

B10- or BF3- Proportional

Counter

Start-up Channel

DAK 250-i

2 … 3

Channels*

Intermediate

Range IRM

Compensated

Ion. Chamber

KNK 50 SAC

Start-up Channel

DAK 250-g

2 … 4

Channels*

Wide Range WRM

Ex-core

Wide-Range

Fission Ch.

Wide Range

Channel

DWK 250

3 … 4

Channels

Power

Range

Power

Range PRM

Uncompensated

Ion. Chamber

KNU 50

Power Range

Channel

DGK 250

8 … 16

Detectors,

4 DGK

Flux

Distribution

Monitoring

In-core SPN Detector

Power

Distribution

Channel DLK

250

18 … 36 det.

3 … 6 DLK

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proTK™ NFMS - Range coverage

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proTK™ NFMS - Typical Architecture

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proTK™ NFMS - Signal Processing for RPS (PWR)

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Modular, multi-microprocessor system with a

separate microprocessor for the safety signal path

Cycle time of signal processing starting with 5 ms

Low heat C-MOS technology

Software fixed in EPROM, efficient self monitoring

Remote signal generators and signal simulation

Qualified according to KTA 3501/3505, IEC 60 880

proTK™ - Features

Simple &

Clear

Fast

Safe

Reliable

Testable

Type-tested

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Table of contents


Configurations of the Digital, Modular proTK™ Examples with various requirements/degrees of complexity


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Example of Renewing Existing Installations in a RR

Replacement of all nuclear instrumentation

the

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... „seamless“ replacement of aging instrumentation ...

Replacement of all nuclear instrumentation at a RR

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Example: Safety Channels for the Neutron Flux Level with DGK 250 M

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• For the replacement of the 4 „Safety Channels for

the Neutron Flux Level “ a modified power range

channel DGK 250 M has been developed

• The signal processing of the DGK 250 M was

designed to exactly replace the „old“ equipment:

same input signals, same output signals, same

response times, identical signal processing

• The new SW of the DGK 250 M has been type

tested according to IEC 60880 and KTA 3503/3505


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Picture of one of the safety channels that have

been replaced by DGK 250 M channels


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DGK 250 channel with customer specific SW for the

replacement of the safety channels


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Certificate, issued by TÜV Nord

for the SW of the type tested,

customized power range channel

DGK 250 M.

Type Test according to KTA 3503/3505 and IEC 60880.

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New proTK™ Channels after Installation


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Example of Renewing Existing Installations in a RR

Start-up Channel with 16 linear measuring ranges

Replacement of the Automatic Flux Control Channel

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• DAK 250 with 16 linear measuring ranges

• 2 Variants:

- DAK 250-i: Detector signal: 0.1 ... 5e6 cps

- DAK 250-g: Detector signal: 0.1 pA ... 1 mA

• Output signals for the linear measuring ranges

- Analog Signal in the range from 0...10V in combination with

- Indication of selected measuring range (binary signal) (BCD

signal or 16 relay contacts available)

• Range switching options

- Automatic

- Only with permission form the operator (via push buttons)


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• Extension/combination of the linear measuring

ranges of the DAK 250 and the DWK 250, to

include the pulse range and Campbell range of

the fission chamber. The picture shows the

indicator for the currently selected range.

Start-up & Wide Range Channels with Combined Linear Measuring Ranges

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Automatic Flux Control Channel – Signal Processing

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Automatic Flux Control Channel – Front View

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Example of a New Installation in a Research Reactor

Remote Control System (RCS)

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System Structure: List of Neutron Flux Monitoring Channels

NMS Channel Tag No. Channel

Type ID Tag / Device_ID /

Plant code RS 485

Bus address

RPS

Ch. A xxx-003A DWK 250 xxx-003A-W 0

DGK 250 xxx-003A-G 1

Ch. B xxx-003B DWK 250 xxx-003B-W 2

DGK 250 xxx-003B-G 3

Ch. C xxx-003C DWK 250 xxx-003C-W 4

DGK 250 xxx-003C-G 5

RRS

Ch. A yyy-001 DWK 250 yyy-001-W 6

DGK 250 yyy-001-G 7

Ch. B yyy-002 DWK 250 yyy-002-W 8

DGK 250 yyy-002-G 9

Ch. C yyy-003 DWK 250 yyy-003-W 10

DGK 250 yyy-003-G 11

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JRTR - NMS channels

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System Structure: Digital Wide Range Channel DWK 250

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System Structure: Digital Power Range Channel DGK 250

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System Structure: Block Diagramm

Ethernet crossover cable

xxx

xxx

xxx

yyy

yyy

yyy

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SW-Functions: Overview of the SW-Structure

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Formula to calculate the new calibration factor value:

𝐶𝐹𝑛𝑒𝑤 = 𝐶𝐹𝑜𝑙𝑑 ∗𝑃𝑡ℎ [% 𝐹𝑃]

𝑃𝑛𝑣 %𝐹𝑃

• Pth Reference power level (current thermal power level) in %FP Entered by the operator in the first stage of the FPA

• Pnv Neutron flux based reactor power measurements in %FP Sampled form the selected channel during the FPA process by the RCS

• CFold Old calibration factor value Read from the selected channel during the FPA process by the RCS

• CFnew New calibration factor value Calculated by the RCS during the FPA process; CFnew is sent to the selected

channel

FPA: Calculate the new calibration factor CFnew

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FPA: Read measured values Pnv

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PS: Simulation based tests

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Example of Support Equipment for Periodical Testing

Test „Trolley“ For Automatic Testing

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Test „Trolley“ For Automatic Testing

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• With proTK™ Mirion offers a full range of neutron flux monitoring

channels for BWR, PWR and test, research and training reactors.

• These neutron flux monitors are designed and qualified for providing

signals of highest safety standards, i.e. for the reactor protection

system (RPS) and also fast signals for reactor control

• The modularity of SW and HW allows its implementation virtually any

NPP or other nuclear facility (existing or new).

• The qualified SW and HW can be configured to meet most needs.

Where needed SW or HW modules can be adapted.

SUMMARY / CONCLUSION

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