Allocation of Safety Integrity Level for Railway Platform Screen Door System considering Semi-Quantitative Risk Reduction Factor

반 정량적 리스크 저감 요소를 고려한 철도 승강장 스크린 도어시스템의 안전 무결성 수준 할당

  • Received : 2016.06.22
  • Accepted : 2016.08.05
  • Published : 2016.08.31


There exists required safety integrity level (SIL) to assure safety in accordance with international standards for every electrical / electronics / control equipment or systems with safety related functions. The SIL is allocated from lowest level (level 0) to highest level (level 4). In order to guarantee certain safety level that is internationally acceptable, application of methodology for SIL allocation and demonstration based on related international standards is required. However, the theoretical and practical study for safety integrity level is barely under way in the domestic railway industry. This research studied not only the global process of SIL allocation to guarantee safety in accordance with international standards for safety related equipment and system, but the quantitative methodology based on international standard and the semi-quantitative methodology as alternative way for SIL allocation. Specifically, the systematic SIL allocation for platform screen door system of railway is studied applying the semi-quantitative methodology in order to save much time and effort compared to quantitative method.


safety integrity level;railway;platform screen door;safety integrity allocation;tolerable hazard rate;tolerable individual risk;individual risk of fatality


  1. IEC62425, Communication, Signalling and Processing Systems - Safety Related Electronic Systems for Signalling IEC, pp. 33-46, 2007.
  2. PD CLC/TR, 50451 - Railway Applications - Systematic Allocation of Safety Integrity Requirements British Standards, pp. 18-42, 2007.
  3. IEC61508, Functional Safety of Electrical / Electronic / Programmable Electronic Safety-related Systems, Part 5, IEC, pp. 10-44, 2010.
  4. IEC62278, Railway Applications - Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS), IEC, pp. 49-53, Annex D, 2002.