T p smyth amec knutsford cheshire uk
This presentation is the property of its rightful owner.
Sponsored Links
1 / 15

Current status of NPP I&C in the United Kingdom PowerPoint PPT Presentation


  • 82 Views
  • Uploaded on
  • Presentation posted in: General

T P Smyth AMEC, Knutsford, Cheshire, UK. Current status of NPP I&C in the United Kingdom. 22 nd Meeting of the Technical Working Group on Nuclear Power Plant Instrumentation and Control, 20-22 May 2009, Vienna. Current status of NPP I&C in the United Kingdom. Nuclear Power Plants in the UK

Download Presentation

Current status of NPP I&C in the United Kingdom

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


T p smyth amec knutsford cheshire uk

T P Smyth

AMEC, Knutsford, Cheshire, UK

Current status of NPP I&C in the United Kingdom

22nd Meeting of the Technical Working Group on Nuclear Power Plant Instrumentation and Control, 20-22 May 2009, Vienna

TWG-NPPIC, May 2009, Vienna: UK status


Current status of npp i c in the united kingdom

TWG-NPPIC, May 2009, Vienna: UK status

Current status of NPP I&C in the United Kingdom

  • Nuclear Power Plants in the UK

  • Status of I&C at nuclear plants

    • Reactor Protection Systems

    • Data Processing Systems

    • Refuelling machines

  • Status of regulatory environment affecting I&C

  • Recommendations


Nuclear power plants in the uk 1

TWG-NPPIC, May 2009, Vienna: UK status

Nuclear Power Plants in the UK (1)

Reactors

Type

Unit capacity

Start operation

Expected shutdown

Oldbury

Magnox

2 x 217 MWe

1968

2010

Wylfa

Magnox

2 x 490 MWe

1971

2010

Hinkley Point B

AGR

2 x 610 MWe

1976

2016

Hunterston B

AGR

2 x 605 MWe

1976

2016

Dungeness B

AGR

2 x 545 MWe

1983

2018

Hartlepool

AGR

2 x 595 MWe

1984

2014

Heysham 1

AGR

2 x 615 MWe

1985

2014

Heysham 2

AGR

2 x 615 MWe

1988

2023

Torness

AGR

2 x 625 MWe

1988

2023

Sizewell B

PWR

1 x 1196 MWe

1995

2035

Total (19)‏

11 035 MWe


Nuclear power plants in the uk 2

TWG-NPPIC, May 2009, Vienna: UK status

Nuclear Power Plants in the UK (2)‏

Electricity sources

19% nuclear

36% gas

38% coal

Need to plan for energy replacement

7 plants will close in next 9 years

14 reactors

7359 MWe

13% of electricity sources

North Sea oil and gas will be limited in future

New build

Generic Design Assessment (AP1000, EPR)

Target completion of GDAs June 2011

Sites identified

http://www.hse.gov.uk/newreactors/


Agr reactor protection systems 1

TWG-NPPIC, May 2009, Vienna: UK status

AGR : Reactor Protection Systems (1)‏

Neoprene insulation degradation

Magnox Oldbury power station

Degradation with age

Perishing

Sweating

Hygroscopic

Becomes conductive - resistance < 1 MΏ

Stray currents in sensitive circuits

Thermocouple amplifiers


Agr reactor protection systems 2

TWG-NPPIC, May 2009, Vienna: UK status

AGR : Reactor Protection Systems (2)‏

Neoprene insulation degradation‏


Agr reactor protection systems 3

TWG-NPPIC, May 2009, Vienna: UK status

AGR : Reactor Protection Systems (3)‏

Neoprene insulation degradation


Agr reactor protection systems 4

TWG-NPPIC, May 2009, Vienna: UK status

AGR : Reactor Protection Systems (4)‏

Neoprene insulation degradation

Survey of all safety equipment

Presence of neoprene

State of neoprene

Circuit function

Replacement equipment at older stations

Obsolescent anyway

Repairs at newer stations

Heysham 2 / Torness

6 years work, 1 more year to finalise all equipment

Prioritised by susceptibility


Agr reactor protection systems 5

TWG-NPPIC, May 2009, Vienna: UK status

AGR : Reactor Protection Systems (5)‏

  • Neutron Flux measurement systems

    • AGR detectors located in core at 8 locations

      • High temperatures

    • Detector spares

      • Wide range detector – integral cable

      • Manufacturing spares – re-establishing production processes

      • Currently a batch of 10 in progress

    • Electronic units

      • Neoprene

      • Repairs at Heysham 2 / Torness

      • Replacement at other stations


Agr data processing systems

TWG-NPPIC, May 2009, Vienna: UK status

AGR : Data Processing Systems

Safety claims on equipment

Some reactor control functions

Some alarms

Hinkley Point B

New DPS installed (1999)‏

Dungeness B

New DPS being installed

Control / equipment protection functions segregated

Ready for works testing

Other AGR's

Stabilization of equipment

Adequate spares provision / hardware support.

Improved air conditioning

Heysham 2: specification phase


Agr refuelling machines

TWG-NPPIC, May 2009, Vienna: UK status

AGR : Refuelling Machines

Online refuelling

Stringent safety requirements

Equipment obsolescence

Key focus at present

Heysham 2 / Torness

Replacement of Reypac controllers with Siemens S7

I/O replaced, emulates original equipment

Reypac controller replacement

Software reverse engineered and ported

Safety functions partitioned

Successful implementation, scope of replacement expanded.

Safety standards

Modern standards considered when replacing equipment


Regulatory environment 1

TWG-NPPIC, May 2009, Vienna: UK status

Regulatory Environment (1)‏

Standards hierarchy

NII SAPs and TAGs (http://www.hse.gov.uk/nuclear)

IAEA standards

IEC standards

IEC 61226

Modern standards reviews

Design, Operation and Maintenance

Part of Periodic Safety Reviews

PSA based assessment

Target 10-7 / year

Limit of reliability claims for software based systems

Assume 1 demand / year

10-4/demand

Require diverse protection to make up 10-3/demand


Regulatory environment 2

TWG-NPPIC, May 2009, Vienna: UK status

Regulatory Environment (2)‏

Application to Sizewell B

Primary Protection System

Four channels, 2 out of 4 tripping

Software based

Production excellence

IEC 60880

Independent confidence building

Extensive testing

Independent code safety assessment

Secondary Protection System

Four channels, 2 out of 4 tripping

Protection for frequent faults

Laddic – magnetic amplifiers

Diverse technology


Regulatory environment 3

TWG-NPPIC, May 2009, Vienna: UK status

Regulatory Environment (3)‏

New build

In general, same regulatory requirements as Sizewell B

Diversity requirements in reactor protection systems

Possibly less onerous protection system targets

Passively safe systems will make fewer demands

Smart Instruments

Regulator considering application to nuclear facilities

Assessment of evidence

Plant owner collaboration

Shared qualification and licensing assessments

SIL1

No fieldbus


Recommendations

TWG-NPPIC, May 2009, Vienna: UK status

Recommendations

  • IAEA topics

    • Estimating and extending life of I&C equipment to address ageing and obsolescence

    • Supporting the evaluation, acceptance and licensing of digital I&C system

    • Lessons learned from I&C project implementation and guidance for modernisation and new plant project


  • Login