Erfahrungs- und Forschungsbericht 2012 - Ensi

Erfahrungs- und Forschungsbericht 2012 - Ensi

Development of a general lifetime and remaining

useful life model based on a non-stationary gamma

process has been made. The model is able to

describe when the degradation process crosses

a randomly distributed fault state threshold. The

resulting remaining useful life distribution model

is exact and can analytically show how it depends

on the concavity/convexity (shape) of the degradation

trend and the shape and scale of the fault

state threshold.

A design of the end user interface for interacting

with the procedure assessment prototype

has been prepared. Furthermore, a man-machine

interaction solution for portable procedures has

been proposed. Basic framework and networking

solutions for these applications have been

implemented. Also, sample procedures have

been formalized.

Software system dependability

The research programme on software systems dependability

contributes to the introduction of digital

instrumentation and control (I&C) systems into

nuclear power plants. Focus is on 4 topics important

both to design and production of digital I&C as

well as safety assurance and licensing issues. These

topics are: modernisation of digital I&C, integrating

requirements engineering and risk assessment, assessment

of error propagation and common cause

factors, and assessment of advanced control systems.

Summary of activities:

A wide range of means for requirements engineering

have been identified and analysed, and

a set of them have been found to be relevant

for elicitation. It has been found that the field of

modern information retrieval has some potential

in order to automate parts of the requirements

elicitation process.

A prototype of the tool HALDEN RM (Requirements

Manager), based on the TACO Traceability

Model has been developed.

National Cooperation

The Fuels & Materials programme is supported by

LOCA calculations performed at PSI; in particular

regarding the specification of the conditions of the

LOCA tests using segments from the Leibstadt NPP.

In 2012, Swissnuclear selected the work of Grigori

Khvostov on «Modellierungsarbeiten zur Unterstützung

des LOCA-Experimentes IFA’650.12» as

Project of the Year 2011. The test executed in 2012

and the next one planned for execution in 2013

make again use of Leibstadt fuel (70 MWd/kgU).

PSI is actively using other Halden reactor experiments,

e.g., the rod overpressure/clad lift-off test

where a proposal on overpressure tests analysis

was approved by the Swiss Fuel Safety Group.

In order to make the results from the experiments

in HAMMLAB more useful for HRA practitioners,

the Halden Project has established close contact

with HRA specialists in the member organisations

in the planning of activities in HAMMLAB. In Switzerland

close contact is established with PSI and

ENSI in these matters. Dr. Vinh Dang, PSI, is also

taking part in the NEA work group, WGRISK, on

HRA information exchange where also the Halden

Project is participating, and this further enhances

the cooperation with PSI in this area.

The 8th Halden On-Line Monitoring User Group

meeting (HOLMUG) was arranged in ENEA Casaccia

Research Center – Rome, Italy, October 18 th –19 th

2012 with Swiss participation.

International Cooperation

The OECD Halden Reactor Project is a joint undertaking

of national organisations in 19 countries

sponsoring a jointly financed research programme

under the auspices of the OECD Nuclear Energy

Agency. The international members of the Halden

Project participate actively in formulating, prioritising

and following up the research programmes.

This ensures that the work is focused on tasks with

direct safety relevance. In the execution of the

programme, the Halden Project maintains close

contacts with its member organisations in these

countries and with NEA and its relevant working

groups. The technical steering is exerted by the

Halden Programme Group with members from the

participating organisations. The Group approves

the annual research programme and oversees the

progress of the work.

An OECD HRP/NEA summer school on Software

Dependability was arranged in Halden 20-23 August,


The last Enlarged Halden Programme Group Meeting

(EHPG) was held in Sandefjord 2 nd –7 th October

2011 with several participants from Switzerland.

The next EHPG meeting will take place at Storefjell,

Norway, 10 th –15 th March 2013. This is a good

opportunity for exchanging information with the

international community on key research topics

within the Fuel & Materials and the MTO.

ENSI Erfahrungs- und Forschungsbericht 2012 113

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