Norway's Petroleum Safety Authority reported late Tuesday that it has issued an order to BP following the safety body's investigation into the hydrocarbon leak on the UIa P platform on Sep.12 2012.
The PSA said that the incident, in which an estimated 125 barrels of oil were leaked from the platform along with more than a ton-and-a-half of natural gas, had the potential to become a major accident, with the "risk that a number of lives might have been lost and substantial material damage caused". Production was shut down for 67 days as a result of the leak, although no people were injured in the incident.
The investigation revealed that the leak was caused by fracturing of bolts holding together a valve in a separator outlet. Seepage in the valve exposed the blots to produced water with a high content of chlorides and a temperature of around 120 degrees Celsius, which resulted in chloride stress corrosion in the bolts until they eventually fractured.
On Monday the PSA said it had identified a number of serious breaches of regulations. Tuesday saw the organization confirm an order that BP must carry out two reviews by September 1 this year:
Measures identified under the two items above must be implemented by Dec. 31 2013, the PSA added.
The Ula field is located in the southern North Sea and produces around 13,000 barrels of oil per day.
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