Abstract
Currently a new taxonomy approach is developed by the
DIGREL task group, established by the Working Group on
Risk Assessment of OECD/NEA, in order to support the
modelling of digital I&C systems in the framework of PSA
for nuclear power plants (NPP). It should improve the
identification of potential failure modes of hardware as
well as software. It is based on generic experience with
different types of digital I&C systems. Also it should
help to define the structure of data to be collected and
support the quantification of PSA models. The DIGREL task
group has decided to separate the evaluation of the
taxonomy approaches of digital I&C systems into two
parts: a taxonomy of the failure modes of hardware and a
taxonomy of the failure modes of software. This paper
presents a proposal for a generic structure of the
hardware of a digital I&C system with safety- functions
relevant to safety. The hardware failure mode taxonomy
approach is based on decomposition of a particular
digital I&C system according to a generic hardware
structure. It is assumed that this generic decomposition
is sufficient to identify generic issues of the specific
I&C systems, components and functions. The decomposition
of the hardware into modules is based on the current
practice of data collection from operating experience of
analog and digital I&C to be applied in PSA. The
simplified model takes into account the typical design
features of digital I&C systems in the NPP e.g. redundant
signal processing, network communication and voting of
the actuation signal. Furthermore, a concept
(methodology) is presented for the identification of
generic issues with regard to failure modes of hardware
of a digital I&C system and to probable effects by
propagation of the failure modes through each level of
signal processing (local, next higher assembly and system
level)
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 11th International Probabilistic Safety Assessment and Management Conference & The Annual European Safety and Reliability Conference |
| Subtitle of host publication | PSAM11 ESREL 2012 |
| Publisher | Curran Associates Inc. |
| Pages | 1898-1907 |
| Volume | 3 |
| ISBN (Print) | 978-1-62276-436-5 |
| Publication status | Published - 2012 |
| MoE publication type | A4 Article in a conference publication |
| Event | 11th International Probabilistic Safety Assessment and Management Conference and The Annual European Safety and Reliability Conference, PSAM11 & ESREL 2012 - Helsinki, Finland Duration: 25 Jun 2012 → 29 Jun 2012 |
Conference
| Conference | 11th International Probabilistic Safety Assessment and Management Conference and The Annual European Safety and Reliability Conference, PSAM11 & ESREL 2012 |
|---|---|
| Country/Territory | Finland |
| City | Helsinki |
| Period | 25/06/12 → 29/06/12 |
Keywords
- Digital I&C
- failure modes taxonomy
- hardware
- PSA