25-09-2019, 09:19 AM
NR rarely approve anything, design being a perfect example of NR acceptance whereas a CRE approves it. Acceptance, in this case, is NR accepting the design is correct based on statements made and assurances given by the designing party and do not wish to take ownership/responsibility for it. That would be approval of the design.
Why products are accepted is simple. When a product has been demonstrated to be fit for purpose, to be reliable, work in the correct environment and not cause negative effects to other equipment/personnel, the risk of that product being used, especially in safety critical applications, is severely reduced. An infrastructure owner would also wish to ensure the product is replaceable (repair and/or obsolescence), maintainable and is limited to suitable applications.
Not necessarily a safety case. It depends on the equipment being proposed. A SIL4 Interlocking is a very different consideration to a fuse built to applicable standards. It also depends if the equipment is novel, the application is novel [for the equipment or to the infrastructure], grandfather rights or whether there is cross-acceptance.
With NR, the initial application lists all the above and permits a list of requirements to be provided. These then require a demonstration of how they are met and dependant upon the equipment, acceptance could be given, further information requested or a trial.
The NR PA website is very useful and there is plenty of information to digest.
Why products are accepted is simple. When a product has been demonstrated to be fit for purpose, to be reliable, work in the correct environment and not cause negative effects to other equipment/personnel, the risk of that product being used, especially in safety critical applications, is severely reduced. An infrastructure owner would also wish to ensure the product is replaceable (repair and/or obsolescence), maintainable and is limited to suitable applications.
Not necessarily a safety case. It depends on the equipment being proposed. A SIL4 Interlocking is a very different consideration to a fuse built to applicable standards. It also depends if the equipment is novel, the application is novel [for the equipment or to the infrastructure], grandfather rights or whether there is cross-acceptance.
With NR, the initial application lists all the above and permits a list of requirements to be provided. These then require a demonstration of how they are met and dependant upon the equipment, acceptance could be given, further information requested or a trial.
The NR PA website is very useful and there is plenty of information to digest.
Le coureur