Relays add safety to nuclear plant
A
Schmersal UK product story
Edited by the Engineeringtalk editorial team
Jul 8, 2003
Schmersal UK has supplied and installed a number of safety relays and a unique positive break safety limit switch for applications at the British Nuclear Fuels (BNFL) Sellafield site.
Schmersal UK has supplied and installed a number of safety relays and a unique positive break safety limit switch for applications at the British Nuclear Fuels (BNFL) Sellafield site.
BNFL placed the first order after identifying that an ultimate stop switch needed to be fitted to a moving platform that is used for the safe monitoring and decontamination of nuclear flasks.
Due to the wet environmental conditions the switch had to be suitably IP (ingress protection) rated.
After talking to various manufacturers, Allan Shaw of BNFL thought he would have to order a bespoke switch, but later discovered that although most manufacturers offer a 60A, 415V positive-break safety limit switch, only Schmersal could supply the IP67 rated version required for the safety system.
In addition to the series limit switch, BNFL had a requirement for a specialist safety gate switch.
Schmersal subsequently designed a circuit using a combination of the switch operating through special safety relays that would prevent the operators from being placed in a dangerous position.
Since completing the installation, Schmersal has been asked to train BNFL staff on these and other safety related systems.
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