Colleague, I am investigating an event in which operators routinely used a safety device for operational purposes. After thousands of successful evolutions...
Dr. Bill, A little more information would be helpful. What type of safety device was this? How was it used in order to perform the evolution? What was the...
Bill, bear in mind that I'm watching the Masters' Golf Tournament as I think about your questions and write this response. I've seen some of the world's best...
Larry, Thanks for your insights. The airline accident you are referring to is probably ValuJet 592. I don't recall it as involving using a safety device for...
Terry, The device was a physical travel limit stop. It was being used to stop the travel of a piece of equipment day in and day out. One day the physical...
Bill, I guess it would all depend on whether the stop became loose and was unnoticed or was intentionally bypassed. I've seen limit switches become loose over...
Terry, Is it acceptable to use a travel limit stop routinely to stop the travel? Or should the operators be told to stop the travel before it hits the stop? We...
Bill, How difficult was the installation of the stop. I'd be wondering if this was a typical way of the operator's dealing with problems -where did they learn...
No, the airline publication was popularized in the nuclear industry through INPO, but I thought that it had come from a federal agency study. It involved...
Larry, I apologize for not being clear about what it is to: a.. Challenge a safety device or b.. Use a safety device for operational purposes. The two are...
Did the operators have adiquate visual feedback and control -as the crane approached the stop? Is it a design and cost issue -cheapest- in that there wasn't an...
Mike, Great lines of inquiry. I will be pulling those strings. Thanks ever so much. Take care, Bill Corcoran W. R. Corcoran, Ph.D., P.E. Nuclear Safety Review...
Bill C., It would not be considered acceptable to use a travel limit stop as the braking device (assuming you have a braking device). The accepted design ...
Terry, That's very helpful. I think I'll recommend some visual cue for a "safety zone" next to the travel stop. The operators will be told not to move the...
Bill C., We have an overhead crane which has indicator lamps that light when you get to the end of the travel zone. A yellow lamp lights when you are near end...
Peter, Thanks ever so much. I like the basic ideas behind your practices. We will incorporate them in our recommendations. Take care, Bill Corcoran W. R....
Based on further traffic on this issue, I will contribute that I have found crane training to be among the least attended to topics in nuclear power plants'...
Larry, What are the safety devices you are referring to? How are they used as operational controls? Take care, Bill Corcoran W. R. Corcoran, Ph.D., P.E. ...
Larry, It's a bigger problem than cranes. The problem is all on-site load movements. Take care, Bill Corcoran W. R. Corcoran, Ph.D., P.E. Nuclear Safety Review...
Collars around drill bits prevent deeper penetration than intended. They are close to or identical to the diameter of the bit and are tightened in place by a...
That's why in my first response I suggested that the issue(s) transcended the manifestations of problems. The more I hear on this matter, the more I suspect a...
Colleague, After a recent event, a group called in to investigate the mishap did some repairs to the component whose failure allowed the mishap to occur. This...
Larry, In a sense you are right. A travel stop is a travel stop. But all travel stops are not created equal. The ones I am concerned with are intended to...
Certainly, in the main, your dichotomy is correct - I would only interject that "people" operate table saws, lathes, routers, and the like in the workplace as...
I agree with Peter in that sometimes you need to use the stop when you must work near the end of travel. I wouldn't care to comment on anyone's safety ...
Great question, Bill. I wish I could say that we are better at this than we really are. We have a maintenance procedure to preserve evidence (bag and tag)...
While I agree that the front office contributes to the use of many poor work practices, making the assumption that it started there may be premature without...
Colleagues, I thought about your safety stop discussions this morning as I was filling the gas tank on my car. I did as I always do. I set the latch on the ...
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