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Safety and Reliability Analysis

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Technical Management Information Systems

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Research and Development

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Realized Projects

The majority of our projects have originated from research projects which we have conducted for our customers. Many of these projects involve critical corporate domains. If you would like to learn more about our competence in the sphere of safety and reliability of technical systems, please contact us!


Realization of fire probabilistic safety analysis (FPSA) for E-on Nuclear Energy

ERRA conducted the fire probabilistic safety analysis (FPSA) for the nuclear power plant KKU at Unterweser. Using probabilistic models, the fire PSA takes into account the possibility of a fire at specific plant locations and its propagation, detection and suppression of the fire; and also helps to assess the effect of the fire on safety-related cables and equipment. The results of FPSA contributed to design modifications in plant to enhance the safety and thereby reduce its contribution to core damage frequency. It also highlights the sources of uncertainty while conducting and suggesting values of risk parameter in FPSA study.


Realization of probabilistic safety analysis (PSA) for the Hamburgische Elektrizitäts-Werke AG (HEW), now Vattenfall Europe AG

Vattenfall-AGERRA dominantly participated in creating the essential parts of the PSAs for the nuclear power plants Krümmel and Brunsbüttel, which both are boiling water Reactor Types. Furthermore, we carried out human reliability analyses and large scale (fossil fuel) power plant analyses as well as power plant specific component malfunction data analyses. In addition we generated the system description for more than 30 safety systems of these plants.



Safety consideration for a prototypical R744 air-conditioning system

For the German automotive industry, we participated in a safety examination using the method of probabilistic safety analysis, regarding the use of carbon dioxide (R744) as an alternative cooling agent in car air-conditioners. R744, as a natural gas, is especially environmentally friendly, however, it can present a health hazard in high concentrations. The scope of this project was to evaluate the possible human health risks. Under the umbrella of an SAE-symposium (Society of Automotive Engineers) we, among others, presented our findings, see FMEA of CO2 Air Conditioning Systems and Comparative Analysis of the Potential Risks of Alternative Refrigerants for AC Systems.


Reliability and Incidence Database for European Industrial Union for Electricity and Heat Production (VGB-Power-Tech e.V.)


On contract for the VGB e.V., we have developed a freely configurable database application (ZEDB). This software is used for the collection of failure relevant data from technical components and comes with a Two-Stage-Bayes evaluation procedure to determine the failure rate or failure probability. ERRA has for many years offered a technical and software-technical support service for the database users and the data delivery points.



Safety evaluation for hydrogen-fuel supply system


ERRA participated in carrying out a safety evaluation for the hydrogen-fuel supply system (LH2-KVA) for the BMW type series E68. Hydrogen is an environmentally compatible alternative fuel. It has like every other technical system the ability for human hazard. The task to solve was to evaluate independently an existing safety analysis. BMW demonstrated with this system that automobiles with hydrogen-fuel just as well to manufacture and to operate as automobiles with standard fuel.


Evaluation and comparison of 4 different Fuel Leakage detection systems for the german automotive industry

The Evaluation was carried out based on predefined criteria and suggestions could be derived upon this analysis which ensured the best type of Leakage detection System is chosen.


Safety Analysis of an airplanes engines control system

ERRA carried out a full system safety study for a new developed airplanes engine control system. This Fault Tree analysis included Fault Tree development as writing of a complete report which was reviewed by German authorities. Analysed systems were for example flight deck indications validated parameters, flight deck alerts as well as functions related to thrust reverse.


Markov to Fault tree conversion for an airplanes FADEC system

The objective of this work was the fault tree modelling of a set of FADEC (Full Authority Digital Engine controls) hazards based on existing Markov modelling. The existing methodology had also been refined. As the Markov models have been rather large, a software has been developed, which automates the process to a large extent.


Human reliability analysis

Human reliability analysis is part to the field of human factors engineering and ergonomics, and describes the reliability of humans in fields such as operation, transportation, the military, or medicine. Human reliability can be affected by many factors such as age, state of mind, physical health, attitude, emotions, propensity for certain common mistakes, errors and cognitive biases, etc. Human reliability is a key factor to a systems safety due to the contributions of humans to the resilience of systems.

ERRA has great expertise in HRA-Modeling which is proven by the large number of carried out HRA Analyses on various fields, such as nuclear technology (human operations) and transportation.

We therefore mainly use our own Software Suite HRA 3-G which can assess the probability of human error.

HRA 3-g has several HRA-Models implemented such as:

• HCR-Model
• HCR-ORE Model/ CBDT Model
• SLIM Model
• FLIM Model

Our Vision

Concerns in the area of safety and reliability of technical systems are more current than ever, and their application is continually advancing into new topic areas. So that we can continue to offer fitting solutions concepts in the area of environmental information systems in future, we adopt the latest trends and new developments early. We use our experience to the advantage of our customers.

Contact Us


67 Syngrou Avenue,
Athens 11745
Tel: +30 210 92 11 030
Fax: +30 210 92 11 034

Delivering a Culture of Reliability to a World that Needs it...