1. Reporting on I&C status and recommendations to IAEA
Meeting of the IAEA Technical Working Group on Nuclear Power Plant Instrumentation and Control (TWG-NPPIC) May 2009 IAEA Vienna
Reporting on I&C status and recommendations to IAEA
Arndt Lindner Institute for Safety Technology (ISTec) Garching

2. TWG-NPPIC Nuclear energy in Germany I&C status in Germany
Content
Nuclear energy in Germany
I&C status in Germany
Recommendations to IAEA
Conclusions

3. TWG-NPPIC There are spent fuel interim storages at all sites
Nuclear Energy in Germany
There are spent fuel interim storages at all sites

4. TWG-NPPIC Nuclear energy provides 22,1% of power generation
Nuclear Energy in Germany
NPP in operation
Output (MWel)
Start of comercial operation
Biblis A
1225
1975
Biblis B
1300
1977
Brokdorf
1440
1986
Brunsbüttel
806
Emsland
1400
1988
Grafenrheinfeld
1345
1982
Grohnde
1430
1985
Gundremmingen B
1344
1984
Gundremmingen C
Isar 1
912
1979
Isar 2
1475
Krümmel
1402
Neckarwestheim I
840
1976
Neckarwestheim II
1989
Philippsburg 1
926
1980
Philippsburg 2
1458
Unterweser
1410
Nuclear energy provides
22,1% of power generation

5. TWG-NPPIC
Nuclear Energy in Germany
“Consensus on Nuclear Power” (from June 11, 2001) is still valid (phase-out of nuclear power)
Several NPPs plan and implement I&C up-grades
Limitation and reactor control systems (GKN, KKU, KKI)
Modernized main control room (KKI)
Independent emergency protection system (KKP)
Turbine control and protection in several NPPs
Applications for digital protection systems have been submitted (GKN, KWB)

6. TWG-NPPIC
Nuclear Energy in Germany
Update of the nuclear regulatory framework Revision D now available (
12 modules
I&C is subject-matter of Module 5
The modules are available only in German language

7. TWG-NPPIC
Nuclear Energy in Germany

8. TWG-NPPIC
I&C status in Germany
Although lots of information about measures to overcome CCF discussion on that issue starts again
IEC Nuclear power plants - Instrumentation and control systems important to safety - Requirements for coping with common cause failure (CCF) is accepted
Application to German NPPs is discussed controversially
Situation is complicated due to application of competing standards

9. TWG-NPPIC Example: Safety classification IAEA: Functions of Category A
I&C status in Germany
Example: Safety classification
IAEA:
IEC 61226:
IEC 61508:
ISO 13849:
Functions of Category A
Functions of Category B
Functions of Category C
Non-categorized functions
Safety Integrity Level (SIL) 0
Safety Integrity Level (SIL) 1
Safety Integrity Level (SIL) 2
Safety Integrity Level (SIL) 3
Safety Integrity Level (SIL) 4
Performance Level (PL) a
Performance Level (PL) b
Performance Level (PL) c
Performance Level (PL) d
Performance Level (PL) e

10. TWG-NPPIC Industry makes proposals
I&C status in Germany
Industry makes proposals
Regulators have additional requirements
Licensed is what neither industry nor regulators want

11. TWG-NPPIC I&C status in Germany Ri Redundancy i; i = 1, 2, 3, 4 A
Sub-system A B
Sub-system B IA
Set of input signals of sub system A IB
Set of input signals of sub system B
PLCAi
PLC(s) Ai; i = 1, 2, 3, 4
PLCBi
PLC(s) Bi; i = 1, 2, 3, 4 i
Internal run time of redundancy i

12. TWG-NPPIC
I&C status in Germany

13. TWG-NPPIC
I&C status in Germany

14. TWG-NPPIC
Recommendations to IAEA
Basis: List of recommendations of TWG-NPPCI Members to the IAEA to be considered in the and Activities
Design, Qualification, and Application of Digital I&C Systems
Modernization of I&C Systems and Components
I&C HW and SW Life-Cycle Related Issues
Human Factors and Reliability, MCR Design, HSI
Improvement and Optimization of Equipment and System Performance
I&C Knowledge Management and Transfer; Aging Workforce
Utilizing Lessons Learned in Operation, Maintenance, and Modernization of I&C
Licensing I&C Systems
Emerging Technologies

15. TWG-NPPIC Signal validation based on modern equipment (c, e, i)
Recommendations to IAEA
Signal validation based on modern equipment (c, e, i)
Complexity of I&C systems, equipment and software (a, h)
Concentration of functions on single CPUs (h)
Qualification and use of FPGA and similar “hard programmed” equipment (a, h)
Electromagnetic Influence on I&C equipment by conducted and radiated disturbances (a, i)

16. TWG-NPPIC Control of CCF (a, h)
Recommendations to IAEA
Control of CCF (a, h)
Cyber security (new activities in IEC/SC45A) (a, h, i)
Use of I&C equipment not designed for use in NPPs in nuclear safety applications (a, h)
Application of competing standards (nuclear vs. nonnuclear) in licensing procedures (a, h)

17. TWG-NPPIC
Recommendations to IAEA