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Audit of Transocean Winner - mooring

On 21 and 22 June the Petroleum Safety Authority Norway (PSA) conducted an audit of Norsk Hydro in connection with consent to exploration and production drilling on Fram Vest with Transocean Winner. The audit was mainly focused on the site specific assessments of the mooring system. During the audit we have found one nonconformity and some conditions with a potential for improvement.

Background for the audit

The incident on Ocean Vanguard in December 2004 illustrated clearly how important safety critical mooring systems are. This incident, which resulted in the loss of two anchor chains in the same corner, is only one of several incidents in connection with the mooring systems reported to the PSA in recent years. In our opinion the incident on Ocean Vanguard might reflect a problem in the entire industry.

Purpose of the audit

The object of the audit is to contribute towards reducing the number of incidents associated with moorings systems on the Norwegian shelf.

Result from the audit

Our impression from the audit is that a number of measures have been taken to improve the safety in different phases and technically in various parts of the mooring system.

However, during the audit we found a nonconformity related to the omittance of a planned extending of the mooring lines on that particular location. Moreover, we have discovered conditions with a potential for improvement relating to quality assurance, current loads, risk analyses, documentation of implemented maintenance and documentation management.

Contact in the PSA:
Inger Anda, press spokeswoman
E-mail: inger.anda@ptil.no
Tel.: +47 970 54 064