ALARP

As Low As Reasonably Practicable, similar to SFARP (So Far As Reasonably Practicable). Expression refers to the acceptable risk level of safety systems, which means “so low as reasonably achievable”. Methodology on the activities of PHA and HA. Concept introduced by some decades in the design and criteria in the legislation of some countries, according to a new approach to security no longer deterministic but probabilistic. This also lead to the use of different parameters (eg SIL.) which tolerance level of risk and value of human life. The tolerance threshold can refer for example to situations or characteristics similar systems or other currently accepted by the company or the people involved, as well as in studies and comparisons with other transport systems, industries, environmental risk situations etc .. In that case interventions targeting security can enter more operationally in the cost-benefit assessments and investment priorities, including in relation to the value or at reasonable cost assignable to save lives in the face of reductions in risk expectations. You should also strive to spend limited resources to further reduce risks already relatively low or tolerable. The concept ALARP defines in practice an intermediate area of ​​intervention between the values ​​of the risk intolerability and levels negligeability of the same. The reference of the intolerable risk extremes could be identified in other transport systems, less safe than rail, while the negligible risk can be referenced in dangerous situations or death due to accidents or not controllable by humans. Regardless of the appearance legislation, the intolerable risk values ​​anyway reamins subject to industrial and managerial competence of the sector strategies, such as the objective of maintaining the same railway to the Lower levels than those of alternative transport modes. More expressions, GAMAB and MEM, define otherwise the acceptable level of risk