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In-Depth Information
Tabl e 6 . Table for deriving a tolerable hazard rate (THR)
=
√
10)
F
THR
G+SDescription
(perfunction)
3
·
10
−
5
/h
9
once in 3 years
10
−
5
/h
10
once in 10 years
3
·
10
−
6
/h
11
once in 30 years
10
−
6
/h
12
once in 100 years
3
·
10
−
7
/h
13
once in 300 years
10
−
7
/h
14
once in 1,000 years
3
·
10
−
8
/h
15
once in 3,000 years
10
−
8
/h
16
once in 10,000 years
tion, that the devices are independent from each other and don´t belong to
anetwork.
4
Conclusion
The application of BP-Risk for the derivation of safety requirements for hot
box detection systems shows that such devices can be designed with a THR
of around
3
·
10
−
5
/h
per function. It was necessary to adapt some of the
well designed parameters within the BP risk procedure to fit also for this
application. BP-Risk offers the possibility to receive a rough estimation for
the safety requirements of hot box detection systems within a short time. For
each parameter the arguments considered in the decision making process are
comprehensible and allow therefore a simple modification in case of updates.
Further steps would be to carry out an in depth analysis for certification
of hot box detection systems. The results of this paper shall be considered as
a first approach for a possible way forward.
References
1. Bepperling, S.-L.: Validation of a semi-quantitative approach for railway
risk assessments. PhD thesis, Institute of railway systems engineering and
tra
c safety, Technical University of Braunschweig (2008). (This thesis is
only available in German: http://www.digibib.tu-bs.de/?docid=00024255).
2. Braband, J.: Risikoanalysen in der Eisenbahn-Automatisierung. In: Eurail-
press Edition Signal + Draht, Hestra-Verlag, Hamburg (2005)
3. CENELEC: Railway application - Communications, signalling and process-
ing systems - safety related electronic systems for signalling, EN 50129.
(2003)
4. DeutscheBahnAG:DBRichtlinie413,Bahnbetrieb-Infrastrukturgestalten.
valid since 01.01.2002, Version of 2006
5. Eisenbrand, E.: PHOENIX MB: Die neue Dimension in der Heißläuferor-
tung. In: Signal + Draht 93 (2001)
