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u r o s a f e Failure Mode and Effect Analysis of Cable Failures within a Fire PSA (J. Herb and E. Piljugin) An enhanced method for the assessment of cable failures caused by fire has been developed by GRS based on a failure mode and effect analysis (FMEA). It intends to overcome the limitations of simplified screening methodologies. Cable function electrical power supply (voltage level) instrumentation cable control cable operational state (open- or closed-circuit) Fire PSA screening: Selection of relevant compartments Generic analysis of potential cable failure Cable type data shielding insulating material construction … FMEA (generic) Detailed analyses for Fire PSA: Analysis of the fire event trees and the fire effects U Interruption of current flow, conductor interruption F Fault to ground (short circuit to ground inside or outside of the cable) Laying specifications cable trays vertical laying cable layer (single, multiple) … Determination of failure conditions in the compartment Determination of the first (time) failure effect on the cables in the compartment Generic analysis of cable failure modes Identification of the relevant cable failure modes inside the specified compartment Generic analysis of cable failure effects Analysis of the cable failure effects on the connected components Identification of the cable in the specified compartment P Hot short (inside or outside of the cable) Failure conditions (temperature) experimental data manufacturer‘s data generic data … Identification of the connected components (electrical and I&C equipment) Determination of the potential impact on the required system functions and/or the contribution to an initiating event Cable failure U – interruption of current flow F – short to ground P – hot short Generic analysis of component failures FMEA (generic) Input signal fault consequence Determination of the impact of cable failures to components and PSA-system functions Cable function power supply instrumentation cable control cable Output signal fault consequence Circuit data continuous or alternating current open or closed circuit (standby) open or closed circuit (by demand) Identification of alarm messages Common mode effects (e.g. shut-down of an I&C cabinet caused by electrical protection) Data of the connected component required function on demand/standby electrical protective functions/devices fault alarm / fault monitoring General arrangement drawing of the cabling in the reference NPP Interface to detailed analyses for Fire PSA The FMEA-tool CaFEA (Cable Failure Effect Analysis) has been developed by GRS on the base of MS Access. CaFEA supports the analysis and records the result of the FMEA. The CaFEA-database contains all relevant data on cables of the reference NPP information on components (description, type, operational mode etc.) Main Control Room Distribution Boards I&C Cabinets Measurement DC circuits Switchgear and Safeguard Building I&C Cabinets Reactor Protection System e.g. LOGISTAT I&C Cabinets Limitation System e.g. GEAMATIC I&C Cabinets Automatic Control e.g. GEAMATIC I&C Cabinets Drive Control Level e.g. GEAMATIC control check back annucation Distribution Boards Plant Facility Field Level Power supply Power supply M Reactor Building Switchgear Facility Based on information found in a generic FMEA for representative components the cable specific FMEA can be performed for each cable in all relevant compartments of a NPP. The availability of the cable data in a database provides an opportunity for further investigations such as the analysis of failure propagation due to cable routing via crossbar racks/distribution boards. Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) mbH Forschungsinstitute, 85748 Garching +49(0)89-32004-418 / [email protected] +49(0)89-32004-470 / [email protected] 0810601 I&C Cabinets Limit value monitor DC circuits Grafik I&C Rooms Power supply E