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Hima-Sella’s Planar4 logic solvers secure Sellafield approval

18 February 2013

Safety systems specialist Hima-Sella’s Planar4 solid-state logic solver modules have secured approval from Sellafield for use in safety systems. Each module within the Planar4 system includes I/O and logic processing, interconnected using wiring techniques such as wire-wrap, solder or termipoint.

The Software (processor) based Planar4 modules have also been subjected to the EMPHASIS assessment methodology. These modules have only been evaluated as suitable for SIL 1 in accordance with current Sellafield requirements. However, they can be re-evaluated to SIL 2, if required, by Sellafield performing an additional Independent Confidence building measure such as ‘software evaluation’.

The EMPHASIS assessment methodology was developed as part of an R&D project by the UK Control and Instrumentation Nuclear Industry Forum (CINIF) with inputs from the Office of Nuclear Regulation (ONR). It is considered to be the nuclear industry’s methodology for substantiation of SMART and Type ‘B’ devices.

The EMPHASIS assessment allows OEMs to claim and demonstrate compliance with the international functional safety standard IEC 61508 for nuclear application. Upon successful completion of the assessment, the OEM will be granted approval for its equipment to be used in nuclear safety applications.


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