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The Nordic PSA Group (NPSAG) is a common forum for discussion of issues related to probabilistic safety assessment (PSA) of nuclear power plants, with focus on research and development needs. The group follows and discusses current issues related to PSA nationally and internationally, as well as PSA activities at the participating utilities. The group initiates and co-ordinates research and development activities and discusses how new knowledge shall be used.

The NPSAG was founded in December 2000 by the nuclear utilities in Finland and Sweden. In addition, the Radiation and Nuclear Safety Authority (STUK) in Finland and the Swedish Radiation Safety Authority (SSM) participate as associated members, which together with the utilities may take part in the funding of the projects within the NPSAG.

All projects sorted by category


NPSAG Matters »

00-001:  General Matters »
Project Manager, NPSAG: NPSAG secretary   Start Year: 2000

00-002:  NPSAG Secretary »
Project Manager, NPSAG: NPSAG secretary   Start Year: 2000

00-003:  NPSAG Autumn Seminar »
Project Manager, NPSAG: NPSAG secretary   Start Year: 2008

00-004:  NPSAG Castle Meeting PSA »
  Start Year: 2000

07-002:  Development of NPSAG Webpage »
Project Manager, NPSAG: Michael Knochenhauer   Start Year: 2002

28-001:  Call for Proposals 2010 »
Project Manager, NPSAG: Michael Knochenhauer   Start Year: 2010

32-001:  NPSAG Project Proposals 2011 »
Project Manager, NPSAG: Michael Knochenhauer   Start Year: 2011

34-001:  NPSAG Project Proposals 2012 »
Project Manager, NPSAG: Michael Knochenhauer   Start Year: 2012


Cooperation »

01-001:  Mapping of Activities Concerning Safety and Reliability at Educational Institutions »
Project Manager, NPSAG: Ralph Nyman   Start Year: 2000   Finish Year: 2001

04-002:  R&D Programmes of the Power Companies – Short-term and Long-term »
Project Manager, NPSAG: Ralph Nyman   Start Year: 2001   Finish Year: 2004

05-001:  Information about Activities in BWR Club »
Project Manager, NPSAG: Anders Karlsson   Start Year: 2002

05-002:  Information about Activities in NKS (Nordic Nuclear Safety Research) »
Project Manager, NPSAG: Göran Hultqvist   Start Year: 2002

07-001:  Information about Activities in the Swedish Fire Safety Group (NBSG) »
Project Manager, NPSAG: Christian Karlsson   Start Year: 2002

12-003:  Information about Activities in BWR Nordic Owner's Group (NOG) »
Project Manager, NPSAG: Lasse Tunturivuori   Start Year: 2004

12-004:  SARNET - Severe Accident Research Network »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Leif Spanier   Start Year: 2004

17-001:  Information about Activities in the TUD Group »
Project Manager, NPSAG: Ralph Nyman   Start Year: 2006

17-002:  Cooperation with universities »
Project Manager, NPSAG: Ralph Nyman   Start Year: 2006

17-003:  Conferences and information distribution »
  Start Year: 2006

18-001:  Cooperation with the SAFIR program »
Project Manager, NPSAG: Juho Helander   Start Year: 2006

21-002:  EU Project NULIFE Nuclear Plant Life Prediction »
Project Manager, NPSAG: Göran Hultqvist   Start Year: 2007

22-001:  ASAMPSA2 - Advanced Safety Assessment Methodologies: Level 2 PSA »
Project Manager, NPSAG: Göran Hultqvist   Start Year: 2008

25-001:  Contacts between NPSAG and VGB »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Bernd Schubert   Start Year: 2009   Finish Year: 2011

30-001:  Contacts between NPSAG and KTH »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Jan-Erik Holmberg   Start Year: 2010

35-001:  Support to the IAEA related to safety goals »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Michael Knochenhauer   Start Year: 2012

35-002:  Evaluation of Risk Measuring Systems »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Gunnar Johanson   Start Year: 2012

36-003:  Cooperation with the IAEA on Fukushima related issues »
Project Manager, NPSAG: Göran Hultqvist


Common Cause Failure (CCF) »

01-002:  NAFCS – Nordic Working Group for CCF Analysis »
Project Manager, NPSAG: Ralph Nyman   Project Manager, External: Gunnar Johanson   Start Year: 2000   Finish Year: 2004

04-005:  Comparison of Methods for Modelling CCF in High Redundancy Systems »
Project Manager, NPSAG: Ralph Nyman   Project Manager, External: Urho Pulkkinen   Start Year: 2001   Finish Year: 2004

04-006:  International Common Cause Failure Data Exchange (OECD ICDE) »
Project Manager, NPSAG: Anders Karlsson   Project Manager, External: Gunnar Johanson   Start Year: 2001

05-003:  CCF Data for Control Rod Drive Assemblies (CRDA) »
Project Manager, NPSAG: Risto Himanen   Project Manager, External: Tuomas Mankamo   Start Year: 2002   Finish Year: 2007

09-001:  NAFCS – Nordic Working Group for CCF Analysis – Continued Activities »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Gunnar Johanson   Start Year: 2003

11-006:  Training Programme on Dependencies and CCF »
Project Manager, NPSAG: Stefan Eriksson   Project Manager, External: Gunnar Johanson   Start Year: 2004

20-004:  Analysis of CCF Data (NAFCS-2) »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Gunnar Johanson   Start Year: 2007

22-003:  Analysis of Critical Component Types »
  Project Manager, External: Johan Sandstedt   Start Year: 2008

28-002:  Identification and Handling of Critical CCCG »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Johan Sandstedt   Start Year: 2010

28-003:  CCF Quantification Considering Barriers against Dependencies – Thesis Application »
Project Manager, NPSAG: Ralph Nyman   Project Manager, External: Gunnar Johanson   Start Year: 2010

34-002:  Methods for Analysis of High Redundancy CCFs »
Project Manager, NPSAG: Anders Karlsson

44-002:  C Book and NAFCS Continuation »
  Project Manager, External: Gunnar Johanson   Start Year: 2014   Finish Year: 2016

53-001:  CCF Workshop »
  Project Manager, External: Gunnar Johansson   Start Year: 2018   Finish Year: 2018


Data »

01-007:  Update of Data for Control Rod Drive Assemblies (CRDA) – Pre-project »
  Project Manager, External: Tuomas Mankamo   Start Year: 2000   Finish Year: 2002

04-007:  Database and Frequencies for Pipe Breaks (R book) »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Anders Olsson   Start Year: 2001

08-001:  Choice of Pipe Break Data in Nordic PSAs (R book) »
  Start Year: 2003   Finish Year: 2004

11-003:  T Code – Computerised Code for Handling and Analysis of T Book Data »
Project Manager, NPSAG: Ingemar Ingemarson   Project Manager, External: Ola Bäckström   Start Year: 2004   Finish Year: 2005

11-005:  Continuity in Activities Related to T Book and T Code »
Project Manager, NPSAG: Ingemar Ingemarson   Project Manager, External: Gunnar Johanson   Start Year: 2004   Finish Year: 2005

12-005:  Data for PSA Models »
Project Manager, NPSAG: Ingemar Ingemarson   Start Year: 2004   Finish Year: 2006

21-001:  Principles for Data Analysis and Parameter Assessment »
Project Manager, NPSAG: Svenne Skagerman   Project Manager, External: Ola Bäckström   Start Year: 2007

28-004:  Functionally Based Grouping of Components »
Project Manager, NPSAG: Sven Skagerman   Project Manager, External: Vidar Hedtjärn Swaling   Start Year: 2010


Fire »

01-012:  International Database of Fire Events (OECD FIRE) »
Project Manager, NPSAG: Ralph Nyman   Project Manager, External: Anders Angner   Start Year: 2000   Finish Year: 2005

01-013:  Methods for Assessing the Probability of Fire Initiation »
  Project Manager, External: Anders Angner, Ola Bäckström   Start Year: 2000   Finish Year: 2001

03-002:  Common Reporting Procedures for Fire Events »
  Project Manager, External: Anders Angner   Start Year: 2001   Finish Year: 2002

04-004:  Analysis of Manual Fire Fighting »
Project Manager, NPSAG: Ralph Nyman   Start Year: 2001   Finish Year: 2002

12-002:  Hot Shorts in Connection with Fire »
Project Manager, NPSAG: Göran Hultqvist   Start Year: 2004   Finish Year: 2005

20-002:  Strategy for Investigating the Impact from Hot Shorts »
Project Manager, NPSAG: Stefan Eriksson   Project Manager, External: Stefan Authén   Start Year: 2007


Human Reliability Analysis (HRA) »

11-004:  Evaluation of Current HRA Methods (EXAM-HRA) »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Anders Olsson   Start Year: 2004

22-004:  Incorporation of Organisational Factors in PSA »
Project Manager, NPSAG: Johanna Oxstrand   Project Manager, External: Jan-Erik Holmberg   Start Year: 2008   Finish Year: 2008

41-001:  Dependences in HRA »
Project Manager, NPSAG: Cilla Andersson   Project Manager, External: Xuhong He   Start Year: 2014   Finish Year: 2016


Initiating Events »

01-003:  Analysis of External Events »
Project Manager, NPSAG: Ingemar Ingemarson   Project Manager, External: Michael Knochenhauer   Start Year: 2000   Finish Year: 2003

01-008:  Analysis of External Events »
Project Manager, NPSAG: BKAB, TVO   Start Year: 2000   Finish Year: 2001

04-001:  Analysis of Reliability of External Power Grid »
Project Manager, NPSAG: Ingemar Ingemarson   Start Year: 2001   Finish Year: 2004

09-002:  Analysis of External Events - Continued Activities »
Project Manager, NPSAG: Michael Knochenhauer   Project Manager, External: Michael Knochenhauer   Start Year: 2003   Finish Year: 2007

12-001:  Mapping of Currently Modelled Initiating Events and IE Frequencies »
Project Manager, NPSAG: Ralph Nyman   Start Year: 2004   Finish Year: 2005

20-001:  Pilot study concerning handling of loss of external grid in PSA »
Project Manager, NPSAG: Stefan Eriksson   Project Manager, External: Erik Sparre   Start Year: 2007

34-003:  Common methodology for analysis of initiating events »
Project Manager, NPSAG: Ralph Nyman   Start Year: 2012   Finish Year: 2014

36-001:  Workshop on Handling of Seismic Events in Swedish PSAs »
Project Manager, NPSAG: Stefan Eriksson   Project Manager, External: Ola Bäckström, Tim Courtney   Start Year: 2013   Finish Year: 2013

36-002:  Handling of weather related issues in PSA »
Project Manager, NPSAG: Göran Hultqvist


Shutdown and Low Power PSA »

01-009:  Analysis of Shutdown States within Nordic Owner's Group (NOG) »
Project Manager, NPSAG: BKAB   Start Year: 2000   Finish Year: 2004

01-010:  Mapping of Methodology for Existing Analyses of Shutdown States »
Project Manager, NPSAG: SKI   Start Year: 2000   Finish Year: 2004

01-011:  S-PSA – Shutdown PSA »
  Project Manager, External: Anders Angner, SwedPower: Lars Bennemo, Enconet: Bojan Tomic   Start Year: 2000   Finish Year: 2002

02-001:  PSA RA – PSA of other Operating Sates than Power Operation »
Project Manager, NPSAG: BKAB   Start Year: 2001   Finish Year: 2002


PSA Applications »

02-002:  LPSA - Living PSA »
Project Manager, NPSAG: Oskarshamn   Start Year: 2001   Finish Year: 2003

03-001:  Quality Requirements on PSA in Risk-informed Applications »
  Project Manager, External: Ola Bäckström   Start Year: 2001   Finish Year: 2003

08-002:  NKS Project about Uncertainties in PSA Applications »
  Start Year: 2003   Finish Year: 2004

09-003:  Quality Requirements on PSA in Risk-informed Applications - Continued Activities »
Project Manager, NPSAG: Göran Hultkvist   Project Manager, External: Per Hellström   Start Year: 2003   Finish Year: 2004

14-002:  Interpretation and Risk Assessment of TechSpec Requirements »
Project Manager, NPSAG: Göran Hultkvist   Project Manager, External: Ola Bäckström   Start Year: 2005

18-002:  Questions regarding risk informed ISI and PSA »
Project Manager, NPSAG: Göran Hultkvist   Start Year: 2006

20-002:  Safety assessment of programmable electronics »
Project Manager, NPSAG: Stefan Eriksson   Project Manager, External: Michael Knochenhauer   Start Year: 2008

20-003:  Safety assessment of programmable electronics »
Project Manager, NPSAG: Tomas Jelinek   Project Manager, External: Kalle Jänkälä   Start Year: 2007

20-005:  Tools for risk follow-up »
Project Manager, NPSAG: Göran Hultkvist   Project Manager, External: Jan-Erik Holmberg   Start Year: 2007

22-002:  Safety assessment of programmable electronics »
Project Manager, NPSAG: Stefan Eriksson   Project Manager, External: Michael Knochenhauer   Start Year: 2008

29-002:  Integrating the use of probabilistic and deterministic analysis in plant safety management »
Project Manager, NPSAG: Göran Hultkvist   Project Manager, External: Michael Knochenhauer   Start Year: 2010


Presentation of PSA Results »

01-006:  PSA End States »
Project Manager, NPSAG: Göran Hultkvist   Start Year: 2000

11-002:  Interpretation and Use of PSA Results »
Project Manager, NPSAG: Michael Knochenhauer   Project Manager, External: Michael Knochenhauer   Start Year: 2004   Finish Year: 2004

13-001:  Common Methodology Descriptions for PSA »
Project Manager, NPSAG: Göran Hultkvist   Start Year: 2005

22-005:  Increased user friendliness and transparency in PSA models »
Project Manager, NPSAG: -   Project Manager, External: Stefan Authén   Start Year: 2008

39-001:  Resultatpresentationsseminarium »
Project Manager, NPSAG: Stefan Eriksson   Project Manager, External: Ola Bäckström   Start Year: 2014   Finish Year: 2015


Other PSA Areas »

01-004:  RADDA - Development of Methods for Analysis of Reactivity »
Project Manager, NPSAG: Göran Hultqvist   Start Year: 2000   Finish Year: 2015

02-003:  Automatic Boron Injection »
Project Manager, NPSAG: Göran Hultqvist   Start Year: 2000   Finish Year: 2001

02-004:  Plant Effects of Loss of Room Cooling/Heating »
Project Manager, NPSAG: Göran Hultqvist   Start Year: 2001

02-005:  Standards and Regulations for Swedish PSA Activities »
Project Manager, NPSAG: Ralph Nyman   Start Year: 2001   Finish Year: 2002

04-003:  SARA - Power Generation in Case of Re-flooding of Overheated Core »
Project Manager, NPSAG: Ralph Nyman   Start Year: 2001   Finish Year: 2001

09-004:  Development of RiskSpectrum Calculation Algorithm »
  Project Manager, External: Per Hellström   Start Year: 2003   Finish Year: 2003

11-001:  Subjective and Objective Probabilities in Nuclear Safety »
Project Manager, NPSAG: Ralph Nyman   Start Year: 2004   Finish Year: 2004

14-001:  The Validity of Safety Goals »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Michael Knochenhauer   Start Year: 2005   Finish Year: 2009

14-004:  APSA - Ageing PSA »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Per Hellström   Start Year: 2005   Finish Year: 2006

22-006:  Quantification quality of Nordic PSAs »
  Project Manager, External: Jussi Vaurio   Start Year: 2008

29-001:  Level 3 PSA »
Project Manager, NPSAG: Cilla Andersson   Start Year: 2010

30-002:  Application of ASME PRA Standard on Nordic PSA »
Project Manager, NPSAG: Göran Hultqvist   Project Manager, External: Ola Bäckström   Start Year: 2010

36-004:  PSA and desktop simulator (TUSS) verification »
Project Manager, NPSAG: Cilla Andersson

43-001:  Multi-Unit (MU) PSA »