The probability of an immediate ignition, Pii, due to gas leaking is a function of the mass release rate as given in Eq. (1) =0.64 P Q ii 0.015 Module M6 has floor dimensions of 20 m 20 m and a height of 8 m. The immediate fatality rate can be estimated based on the volume that experiences radiation more than 37.5 kW/m2 as a fraction of module volume. This lethal volume for a jet fire is defined in Eq. (2). = 1.34 V Q L 379 where: VL = lethal volume (m3); Q = release rate (kg/s) at time of ignition.

A typical worker has 2 weeks on and 2 weeks off and the probability of being in module M6 at the time of ignition is 0.25 when offshore. The average number of personnel in the module over a 24-hour period is 8. a) Comment on the individual risk for a worker working in this environment through calculations. Comment on the assumptions in the model.

b) A safety project can fix the leaking of 40% of the small holes and 10% of the medium holes. Estimate the critical project cost below which the safety project should be adopted. Comment on the assumptions in the model