Nuclear power production carries potential risks both for the environment and for the work force. Different safety measures are employed and they stem from local rules as well as from regulatory authorities. This work describes the development of a safety promoting tool at Forsmark Power Plant, one of Sweden’s three Nuclear power plants. We describe the development of a computer based system for Pre-Job Briefing and Post-Job Debriefing. The organization at Forsmark did not have satisfactory routines and documentation for these operative work procedures, mainly because the large organization and the different sections function relatively independent from each other. Hence the working culture and organization has prevented the development of a unified work procedure for service and inspection work. This master thesis has two parts. A compilation has been made from multiple interviews in order to develop the requirements of a system for Pre-Job Briefing and Post-Job Debriefing. Following this an IT based system has been developed in order to handle the specified procedures. The concept of the user-centered system design process and usability methods has been used. The developed system has been met with acceptance and will be employed in production. It is concluded that the systematic analysis and the employment of the designed system may augment the ability for the organization at Forsmark to live up to the guidelines set by regulatory authorities and thereby create a more secure work environment and power production.

Managing safety at a nuclear power plant is about a complex system with demanding technology under time pressure where the cost of failure is exceptionally high. Swedish nuclear power plants have over the last few years introduced Pre-job Briefing and other so called Human Performance Tools to advert errors and strengthen control. By using the Systemic Resilience Model different views of safety are taken to understand the origin of the signals that leads to a Pre-job Briefing, and how the signal is interpreted, re-interpreted, and presented. The study took place at a Swedish nuclear power plant and included four days of observations and 20 interviewees. The thematic analysis shows a similarity between mentioned origins of Pre-job Briefings and the intended use of Pre-job Briefing. Characteristics of a High Reliability Organisation is shown in practice by a culture of that one will to have a Pre-job Briefing is enough, that sharp end workers is used as a valuable resource for safety and a systematic support to screen jobs over time without influencing non-job related factors. The signals acted upon matched well with the intended, and personnel get several opportunities to evaluate the signals together, striving for best possible circumstances. The Systemic Resilience Model was successfully applied together with a thematic analysis, which strengthens its validity as a holistic model that combines different views of safety in one coherent model. SyRes allowed to present additional themes, leaving the question at what stage SyRes is optimally implemented in a thematic analysis.