MSHA issues blasting alert on Orica Uni tronic 500 electronic detonator

| Published on May 10, 2010

This blasting hazard alert pertains to Orica Unitronic 500electronic detonators date coded before Nov. 15, 2009.

Orica has issued a recall of these detonators. The Orica recall notice is included as part of this blasting alert.

Since 2006, there have been six unplanned detonations involving the use of the Orica Uni tronic electronic detonator blasting system. Four of the unplanneddetonations occurred at surface mines in the United States and two occurred at surface mines in Australia. Four of the unplanned detonations occurred upon the act of aborting the programming sequence and two occurred during programming of the detonators.

The last unplanned detonation was in December 2009 at a surface coal mine in Alabama. The mines were using the Orica Uni tronic™ blasting system to set-up the blasts, check the circuitry, program and arm the electronic detonators for blasting, and to detonate the round.

In each instance, once all personnel were off the blast area and at a point of safety (blast area secured), the blaster connected the circuit to the Orica Blast Box and then began the detection and programming process. While the detonators were being programmed or if an abort command was issued, one of the blast holes unexpectedly detonated.

No injuries or property damage were reported.

The investigations of these incidents have determined the unplanned detonations occurred most likely because of faulty or damaged electronic devices on the electronic detonator boards used as an internal component of the Uni tronic 500 electronic detonator. Orica upgraded all Blast Boxes with a controlled abort procedure in July 2008 and with more than five million electronic detonators sold since then, there has not been an unplanned detonation during an abort.

To address the unplanned detonations during programming, Orica implemented an enhanced test protocol in August 2009to detect circuit boards in its manufacturing process that may have a faulty or damaged electronic device. Since implementing this new testing protocol, there has not been an unplanned detonation during the programming sequence using the tested electronic detonators in more than 1 million that were sold.

Means of identification to determine Uni tronic 500 electronic detonators date coded before Nov. 15, 2009.

Product Recall: Uni tronic 500 Electronic Detonators

Date Code: 15NO09B4 and before

Product Involved: Uni tronic 500 Electronic Assemblies

Date Code: 15NO09B4 and earlier date codes

Assembly Length: All length assemblies

Region: North America

Reason for the Alert: Product Recall

Issue with Product: Unplanned detonation

Bulletin Issued on: May 5, 2010

Effective May 5, 2010, Orica is recalling all Uni tronic™ 500 assemblies with date code 15NO09B4 and prior throughout North America. Orica continues to believe there is not a threat of injury or likelihood of property

damage given the associated blast procedures which strictly follow Orica’s UT Basis of Safety.

However, at MSHA’s request,Orica is conducting a product recall.

Since 2006, more than 7 million Uni tronic assemblies have been safely used without any incidences of personal injury or property damage. However, there have been six unplanned detonations world wide. Four of the unplanned detonations occurred upon the act of aborting the programming sequence and two occurred during programming of the detonators. An investigation surrounding the aborted programming incidents resulted in an upgrade to the Blast Box.

There has not been an unplanned detonation during an aborted programming procedure in over 5,000,000 Uni tronic 500 detonators since the Blast Box upgrade was instituted. To address the two incidents with unplanned detonation during the programming cycle, Orica has implemented an enhanced test protocol to detect faulty devices.

Since implementing this new testing protocol, there has not been an unplanned detonation during the programming sequence using the tested electronic detonators in the over 1,100,000 Uni tronic™ 500 detonators sold since.

As a safety leader, Orica is committed to all its products and procedures. Orica’s UT Basis of Safety on a blast site requires that the blast area be cleared and guarded before sufficient energy to fire a detonator is applied and these safety guidelines were successfully implemented in each of the incidents above. A safety feature built-in to the Uni tronic™ 500

system is that the Uni tronic Network Tester and Scanner for use on bench equipment have neither the sufficient voltage nor current to fire a detonator regardless of the fault conditions that may exist within the detonator.

Although the combination of Orica’s UT Basis of Safety on blast sites coupled with the safety features built into the Uni tronic 500 system provide a very safe operating condition, Orica has decided to take the added step of recalling all Uni tronic 500 assemblies that have not been subjected to the additional test protocol as an additional safety measure.

Date Code: 15NO09B4 and before make arrangements for the return of all the full cases to Orica Brownsburg.

Contact CST. Contact your Orica Client Support Technician to advise us of any partial cases and please safely destroy all partial cases after notifying your CST representative.

Orica will issue a full credit for all returned or destroyed products.

advertisement
comments powered by Disqus

SUBSCRIBE & FOLLOW

advertisement

TWITTER

FACEBOOK

BLOG

advertisement
advertisement
advertisement