Success Stories

Understanding the sirens at the Chalk River Laboratories

(2015 May 28) Being prepared in emergency situation – no matter how unlikely – is an important priority for Canadian Nuclear Laboratories (CNL).  One way we work to ensure that we’re fully prepared for all emergency situations is by regularly conducting drills and exercises to test our response measures and equipment. Many of these drills include the regular testing of sirens at the Chalk River Laboratories (CRL) site. 

CRL’s site siren testing routinely takes place on the fourth Sunday of each month at 2 p.m. These alarms can be heard offsite in communities surrounding CRL. It is important to know that these alerts are part of a comprehensive and collaborative plan between CNL and the neighbouring municipalities, to provide protection to not only our own employees and facilities, but also to residents in our neighbouring communities. 

In addition to the sirens located at CRL, eight outdoor alarms are located within the Laurentian Hills and Deep River communities. These alarms are routinely tested on the first Sunday of each month around 12 p.m., and last approximately eight seconds when sounded. You may also recognize the alarm as the Westminster chime.

If you hear any CRL onsite or community alarm during testing, or even outside of routine testing times, please be assured that no immediate action is required of you. In the very unlikely event of a real emergency, should the sirens sound and the situation warrant action on your part, more information and instruction would be provided through local media, provincial emergency response representatives as well as through our website 

If you have any questions or concerns about emergency preparedness within CNL, we would welcome an opportunity to speak with you.

Corporate Communications