Quantitative Risk Analysis (Qra)

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Scope and Methodology (or simply Introduction?)

This part of the report aims to evaluate a Quantitative Risk Analysis (QRA) report per today’s requirements. These include the requirements as set by NORSOK Z-013 and the PSA (Petroleum Safety Authority). PSA’s regulations can be found in the official PSA website and some of them are mentioned in this section of the report, however in this report greatest reference is given on a set of requirements set by the authority which focuses on the efficient use of safety barriers.
The PSA’s Principles for barrier management in the petroleum industry 2013 published in 2013 is based on a set of requirements focused on barrier management. This requirements ensure that the barriers are relevant, effective
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(NORSOK, A description of implemented safety barriers should be included in the HAZID (Hazard Identification) documentation (NORSOK 5.3.3). NORSOK using as reference the requirements set by ISO 13702, indicates the minimum barriers to be considered during an analysis. (NORSOK 7.5.3) The analysis should define safety barriers related to marine hazards, ship collisions, blowouts and well releases.

The QRA report assesses the performance of the main safety systems and recommends further assurance on the integrity of important systems such as ESD and blowdown systems. Yet, it does not further establish a barrier strategy or specific performance standards, nor is satisfying the majority of requirements set by NORSOK Z-013. It is arguable how consistent the QRA is to PSA and NORSOK Z-013 requirements.

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The PSA ‘Management’ regulation sets acceptance criteria for major accident risk and environmental risk. These criteria shall be set for: (PSA ‘Management’ section 9)

a) The personnel on the offshore or onshore facility as a whole, and for personnel groups exposed to particular risk
b) Loss of main safety functions
c) Acute pollution from the offshore or onshore facility
d) Damage to third party

The risk picture calculated for the on DP2 is performed in compliance with the parts of the risk acceptance criteria relevant for estimation of the risk to personnel on DP2 for manned operations. The Average Individual Risk (AIR) involving all personnel working on the installation on a regular basis is also considered as a risk acceptance criterion.
The QRA analysis states that helicopter shuttling to FCC shall be included in the total risk picture [QRA 2.3.2].

The QRA report sets some important RAC, however it does not cover the whole spectrum of requirements set by NORSOK Z-01. More information could be sought in documents that are not available for reference in this report such as the annexes, and the specified chapters of the risk acceptance criteria (Ch.2.1.1,

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