ASAMPSA2 Project

ASAMPSA2 partners
France: IRSN, CEA, AREVA NP SAS • Germany: GRS, VGB, AREVA NP GMBH • Belgium: TRACTEBEL • Spain: IBERINCO • Finland: VTT, FORTUM, STUK • Hungary: NUBIKI • Italy: RSE SpA, ENEA • Netherlands: NRG • Czech Republic : UJV • United Kingdom: AMEC NNC Ltd • Sweden: FKA, SCANPOWER • Switzerland: PSI, Cazzoli Consulting
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3. Quality and effectiveness of the coordination mechanisms and associated work plan Print E-mail

3.1. Overall strategy and general description

The organization of the coordination action was based on two working groups:
  • a transverse group of End-Users constituted of representatives of plant operators, plant designers, TSOs, safety authorities, R&D organizations, L2 PSA developers. The objectives of this group were:
    • at the beginning of the coordination action, to define and/or validate the initial needs for practical L2 PSA guidelines for both ‘limited’ and ‘full-scope’ methodologies according to the different potential applications, and specific End-User needs,
    • to provide a continuous oversight of the work of the Technical Group,
    • to verify that any proposed  L2 PSA guidelines can fulfill the initial and evolving, if there is any, End User needs at the end of the coordination action,
    • to define any proposed follow-up actions, in collaboration with theTechnical Group.
    This End User Group benefitted from the public domain outcome of the current the SARNET L2 PSA work package, concerning for instance the synthesis of existing practices and the existing guidelines on L2 PSA. Activities of this End User Group corresponded to the first work package of the coordination action.

    Nota : this transverse End-User group was constituted by some of the Consortium Partners, that contacted all European L2 PSA “End-Users” whatever their position (plant operators, plant designers, Technical Safety Organizations (TSO), Safety Authorities). This group provided a general opinion from European countries stakeholders and not only the opinion of Consortium partners.

  • a Technical Group of L2 PSA developers: this group included representatives of organizations which have already performed a level 2 PSA, with either limited-scope or full scope methods. The objective of this group was to produce best practice guidelines for level 2 PSA performance, for both proposed methodologies. A secondary objective was to provide a commentary, in term of general rules and specific needs, for certain Gen IV reactor concepts. The group also identified what types of data sets (including severe accident codes and physical knowledge) were needed for performing the different level 2 PSAs.

    This group started, like the first group, from the public domain knowledge generated by the current SARNET project and other international organizations concerning the methodologies to build event trees, consideration of the different physical phenomena and performance of the uncertainty analyses.

    To make the coordination easier, this technical activity was separated in 3 work packages:

    • WP2 : elaboration of guidelines for a limited scope methodology L2 PSA,
    • WP3 : elaboration of guidelines for a full scope methodology L2 PSA,
    • WP4 : commentary on adaptation for GEN IV reactor concepts.
    WP2 and WP3 proceed in parallel and with strong interfaces and common guidance to ensure that they did not produce divergent conclusions. Common topics between WP2 and WP3 were identified at the beginning of the project to avoid non useful duplication of tasks. WP4 considered more prospective actions and was a rather small part of the coordination action.

Therefore, the organization of the project may be represented in a 2D matrix form:

Organization between the Technical Group and the End Users Group



      Establishing the needs

Verification  that the guidelines fulfil the need

Definition of follow up actions proposal 
TECHNICAL GROUP  Elaboration of a guideline for the limited scope methodology L2 PSA Identification of data set needs for level 2 PSAs based on current reactor designs

Elaboration of a guideline for the full-scope methodology  L2 PSA      
Commentary on adaptation for Gen IV reactor

This organization was supported by a WP5 in charge of general coordination and connection with EC services (§ 3.5).

A specific procedure was defined in the QMP (Quality Management Plan) to guarantee the QA of all deliverables to the Commission. The project benefitted from the experience of Consortium partners to guaranty the quality of deliverables.


3.2. Timing of work packages and their components

For the simplicity of the coordination action, three main phases were proposed:

Phase 1 : determination and synthesis of End Users needs (WP1)
This phase was realized through a questionnaire and a synthesis of End-Users needs, according to the existing requirements (if any) or more general safety objectives and the different potential applications. The questionnaire distinguished between operating plants (Gen II), advanced reactor (Gen III) and future reactor (Gen IV) designs. A workshop facilitated sharing the outcome from the questionnaire and incorporating the final suggestions and needs from the End-Users into an input for the Technical Group.
The synthesis of End Users needs were quite general, to be valid in all countries and for all End-Users, but also included consideration of some important specific issues like LERF definition, mission time, quality of the study or interaction between level 1 / level 2 PSA.
Phase 2 : elaboration of technical guidelines (PSA scope, content and methods, results presentation) (WP2 & WP3)
This phase consisted firstly of preparation of the objectives and scope of the limited-scope methodology and full-scope methodology L2 PSAs, based on the outcome of the synthesis of the End-User needs. This was followed by the development, in parallel, of two sets of guidelines for both types of L2 PSA. A joint workshop with the End User Group was held to present and incorporate any additional needs and suggestions of the End-Users. This task constituted the main effort of the coordination action.
The Technical Group also identified what types of data sets were needed for performing both types of level 2 PSA methodology: The results of this element included suggestions for future R&D programs (severe accident codes development and benchmarking and specific experimental needs).
The existing information database, e.g.,  CSNI/WGRISK synthesis, German guidelines, output of current  SARNET PSA L2 project, guidelines of US-NRC for Individual Plant Examinations, IAEA guidelines (including the ones in preparation), ASME guidelines, ensured high quality deliverables suitable acknowledgement and acceptance by the European End-Users.
Phase 2b : adaptation for GEN IV reactor (WP4)
The technical commentary on adaptation to  GEN IV reactor concepts will be performed in parallel to the activity on existing plants, but with a close connection. The objective is to determine how far the level 2 PSA methodology guidelines being developed in WP2 and WP3 are relevant for Gen IV reactor concepts and what analytical models have to be newly developed or extended to describe the new features of Gen IV reactor concepts in terms of performing a level 2 PSA.
The project will be limited to Sodium Fast Reactors (SFR), Gas Fast cooled Reactor (GFR), (Very) High Temperature Reactor (VHTR) concepts and Lead Fast reactor (LFR).
Phase 3 – validation by End Users (WP1)
  • In this phase, the End Users had the opportunity to express their opinion on the technical activities (WP2, 3 and 4) and take part in the workshops to openly discuss the WP findings and further make proposals, if any, to improve the quality of the deliverables. The final comments and suggestions were incorporated in the final versions of both technical guidelines and the commentary for advanced designs.
  • End Users also participated in developing the recommendations for follow-up actions at this stage.

The overall planning is presented below.

  Month after T0
  1 6 9 12 15 18 21 24 27 30 33 36
Questionnaire on End-Users needs
Preliminary synthesis of End Users Needs
First workshop with End-Users                        
Comparison of existing guidelines                        
Final synthesis of End Users needs                        
Strategy for the limited-scope methodology L2 PSA guidelines                        
Draft European Best Practice Guidelines for the limited-scope methodology L2 PSA                        
Strategy for the full-scope methodology L2 PSA guidelines                        
Draft European Best Practice Guidelines for the full-scope methodology L2 PSA                        
Report on Gen IV designs review                        
Draft report on applicability of best practices guidelines to Gen IV concepts                        
Second workshop with End-Users                        
Synthesis of End Users opinion on the draft guidelines                        
Final European Best Practices Guidelines for L2 PSA                        
  PHASE 1  
    PHASE 2  
    PHASE 3