Protecting against loss of primary containment using high integrity systems

Part 2 Protecting against loss of primary containment using high integrity systems 

44 The MIIB s third progress reporti° indicated that there was a problem with the tank level monitoring system at Buncefieid. 

45 Overfiii protection systems using high-ievei switches or other two-state detectors may be inactive for iong periods and may deveiop unreveaied fauits. Such faults cause the system to fail to danger. Therefore, overfill protection systems should be tested periodically to identify and correct unrevealed faults. 

46 These systems should be designed, implemented, documented, and have a regime of safety lifecycle management necessary to achieve the required SIL in compliance with BS EN 61511. 

Operators of Buncefield-type sites should, as a priority, review and amend as necessary their management systems for maintenance of equipment and systems to ensure their continuing integrity in operation. This should include, but not be limited to reviews of the following  

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