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Confirming isolation & valve indication status are correct
Date of Incident: 21 January 2019
Description:
When isolating the G2 penstock priming valve as per an operating order, the operator failed to confirm the valve was fully closed, instead he relied on the recipient's interpretation of the valve position which was incorrect.
The valve was electrically isolated in a 2/3rd open position when it should have been fully closed. This resulted in priming of the penstock when water was introduced into the priming bus during operations later that day.
Significant contributing factors were the lack of lighting, access and poor valve position indication, making it difficult to ascertain if it was open or closed.
Original Safety Alert Link
