West Corridor Preliminary Hazard Analysis For Final Design-Books Pdf

West Corridor Preliminary Hazard Analysis for Final Design
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West Corridor LRT Final Design, Preliminary Hazard Analysis. Page 1 of 11, RECORD OF REVISIONS, Date Reason for Revision Authorization. 0 6 15 06 Initial Draft IEI DEA, DRAFT Revision 0. June 15 2006, West Corridor LRT Final Design, Preliminary Hazard Analysis. Page 2 of 11, TABLE OF CONTENTS, Section Page, Record of Revisions 2.
Acronyms 3, 1 0 Introduction 4, 2 0 Approach 6, 3 0 Safety and Security Coordination 7. 4 0 Risk Management 7, 5 0 System Definition 8, 6 0 Hazard Identification 8. 7 0 Hazard Analysis 8, 8 0 Hazard Severity 9, 9 0 Hazard Probability 9. 10 0 Risk Determination 10, 11 0 Hazard Resolution 10. 12 0 The West Corridor PHA 11, Appendix A Instructions for completing PHA Form.
West Corridor Preliminary Hazard Analysis for Final Design. PHA No A 0 Alignment, PHA No T 0 Track, PHA No STA 0 Stations. PHA No TC 0 Train Control, PHA No OCS 0 OCS, DRAFT Revision 0. June 15 2006, West Corridor LRT Final Design, Preliminary Hazard Analysis. Page 3 of 11, CCTV Closed Circuit Television, CoPUC Colorado Public Utilities Commission. CPTED Crime Prevention Through Environmental Design. FLSC Fire Life Safety Committee, FRI Final Risk Index.
FTA Federal Transit Administration, HRI Hazard Risk Index. IRI Initial Risk Index, LR Light Rail, LRT Light Rail Transit. LRV Light Rail Vehicle, MPS Manager of Public Safety. MUTCD Manual on Uniform Traffic Control Devices, OCS Overhead Contact or Catenary System. PHA Preliminary Hazard Analysis, PRO Pre Revenue Operations.
QA Quality Assurance, QC Quality Control, ROW Right of Way. RRI Residual Risk Index, RTD Regional Transportation District Denver . SCADA Supervisory Control and Data Acquisition, SIT System Integration Testing. SSPP System Safety Program Plan, SSWG Safety and Security Working Group. TPP Test Program Plan, TPSS Traction Power Substations.
TVM Ticket Vending Machines, DRAFT Revision 0, June 15 2006. West Corridor LRT Final Design, Preliminary Hazard Analysis. Page 4 of 11, 1 0 INTRODUCTION, The identification assessment and resolution of potential hazards has been and. remains the prime means of assuring the highest practical level of safety in any system . The approach now almost exclusively used for light rail transit systems follows the. Hazard Analysis Guidelines for Transit Projects published by the Federal Transit. Administration FTA in January 2000 The process that the David Evans Associates. DEA Interactive Elements Inc IEI Team will use for the West Corridor complies with. these Guidelines but with effort concentrated on system differences from existing RTD. LRT operational and pre operational segments , The start of the Preliminary Hazard Analysis process the identification and analysis of. hazards calls for a rational application of knowledge past experience and judgment on. the part of those performing the tasks Experienced personnel performing hazard. identification and analysis may sometimes differ on the assessment of the probability or. severity of a particular hazard but usually to a minor degree Given this the results of. the process for one LRT system segment would be largely applicable to another LRT. system segment designed and constructed to the same criteria No two systems are. identical however and it is necessary to verify the similarities and apply the full hazard. identification analysis and resolution process to the differences . 1 1 WEST CORRIDOR CONSIDERATIONS, Most of the Facilities to be installed on the West Corridor Track Pedestrian Bridges .
Tunnels Stations are known quantities that have been in use for several years both at. RTD and in the Light Rail Transit industry at large These systems designs have been. refined with each expansion of the RTD Light Rail Transit system . The design and construction of the West Corridor project will however pose new. challenges to RTD the Design Consultant and Construction Contractors Previous LRT. project alignments have been for the most part at grade running generally North . South along existing railroad highway rights of way outside of urban areas and. generally not subject to close interaction with civilian communities located immediately. adjacent to the alignment , The West Corridor although following the trace of an existing single track railroad. alignment traverses known flood plains areas of steeply sloped terrain along the North. and South sides of the alignment and locations where the alignment narrows and. passes through Open Cut type sections closely bound on one or both sides by. homes and or light industry sites and schools In addition there are several locations. where steeply sloping roadways approach rail crossings primarily from the North . DRAFT Revision 0, June 15 2006, West Corridor LRT Final Design. Preliminary Hazard Analysis, Page 5 of 11, West Corridor System Map. Rude Park steep sloped terrain looking west Perry Street looking west . Flood plains will pose challenges with respect to track integrity during periods of high. water the steeply sloped terrain in the initial portions of the alignment will present water. control issues and concerns with respect to lateral and vertical separation of the. catenary system from adjacent park lands and homes the open cut locations will pose. similar concerns with respect to vertical and horizontal catenary clearance from homes. and businesses located close by The steeply sloped terrain to the South of the initial. portions of the alignment and the berm located further to the Southwest will have an. effect on track design Here the concern is to ensure that the LRVs operating on these. portions of the alignment do not leave the track way in the event of a derailment . DRAFT Revision 0, June 15 2006, West Corridor LRT Final Design. Preliminary Hazard Analysis, Page 6 of 11, 13 Garrison The Berm steep slope.
The East West direction of the alignment could have an adverse effect on the Train. Operator s ability to observe the alignment and signal indications illuminated and fixed . during the early morning and late afternoon periods when the bright sun is low in the. All road crossings and closures will present challenges with respect to the control of. pedestrian vehicular traffic and emergency response vehicles to incidents in the civilian. communities Those crossings where the highway approaches are steep primarily from. the North will require particular attention in order to devise cost effective safe . solutions to the control of vehicular traffic during both normal and adverse weather. conditions Road closures must be selected in a manner that will accomplish the safety. requirements of the West Corridor while providing the access into and across the Right . of Way ROW required by emergency responders to the civilian community and to any. LRV incidents that may occur , 2 0 APPROACH, For the West Corridor DEA IEI Team resources and effort have concentrated on those. elements of the West Corridor that exhibit differences from other RTD segments . Initially the DEA IEI Team reviewed the Preliminary Hazard Analyses prepared for. previous segments compared their design criteria to the West Corridor design criteria . and compared alignment characteristics among all the segments These comparisons. not only include the LRT vehicle civil systems and operational elements but also. passenger public traffic and environmental differences along the corridors . These comparisons reveal some new hazards on the West Corridor that had not been. considered on previous corridors but most often they reveal some differing probabilities. and severities for hazards that were identified on the other corridors As an. example the pedestrian patterns prior to introduction of LRT may make trespass more. DRAFT Revision 0, June 15 2006, West Corridor LRT Final Design. Preliminary Hazard Analysis, Page 7 of 11, likely on the West Corridor than on previous RTD alignments This difference could. warrant assignment of a higher risk category and possibly a different resolution than. used on the lower risk alignments , A large majority of hazards identified on the previous corridors is similar to those. identified on the West Corridor While they will of course all be verified the risks. associated with them and the resolutions applied on previous corridors will likely be the. same The prime effort for these hazards therefore is to verify with RTD satisfaction. with the resolutions applied on the previous corridors . For those hazards that are unique to the West Corridor or for similar hazards with a. differing risk factor on the West Corridor the DEA IEI Team will identify resolutions in. the priority hierarchy identified in the FTA Guidelines These will be specifically. identified in the PHA Where appropriate alternate means of resolution may be. presented along with risk factor reduction and cost differences . 3 0 SAFETY AND SECURITY COORDINATION, Although security issues are not normally considered part of a PHA today s.
environment demands that the safety and security aspects of a project be closely. coordinated Hazard management and threat and vulnerability management are. addressed through separate processes looking at safety and security issues . respectively The process to be used by the DEA IEI for Threat and Vulnerability. Analysis TVA is described in a separate document Often however when identifying. a hazard a vulnerability may also be recognized the reverse may also be true As an. example inadequate stairway lighting may be recognized as a hazard that could lead to. injury due to a fall it may also be recognized as a vulnerability posing a threat of injury. due to mugging The hazard resolution and threat remediation may both be at least. partly the same such as an increase in lighting levels . The DEA IEI team recognizes the need to identify assess and resolve hazards or. mitigate threats through separate processes The Team also recognizes the advantages. of coordinating the application of the two processes and their proposed resolutions and. countermeasures to assure the most effective use of West Corridor resources . Towards that end personnel pursuing system safety issues and those pursuing system. security issues will exchange gathered data and meet frequently during the design effort. to get the greatest return possible on the project s investment in safety and security . 4 0 RISK MANAGEMENT, Simply stated safety is freedom from unintentional harm Absolute safety cannot be. guaranteed in any real system The best that may be achieved is a probability of. occurrence so low or consequence so negligible that the resultant risk from hazard or. threat activation can be considered to have no detrimental effect on any person . DRAFT Revision 0, June 15 2006, West Corridor LRT Final Design. Preliminary Hazard Analysis, Page 8 of 11, equipment or system For most hazards this low level of risk is not achievable with the. limited resources available for any transit project The object of the PHA process . therefore is to effectively use available resources to design build and operate a transit. system with the risk level from every identified hazard lowered to an acceptable limit . 5 0 SYSTEM DEFINITION, Defining all elements of the West Corridor LRT system and their differences with other. RTD segments is necessary for the identification of all significant hazards As indicated. earlier the elements and differences to be defined are not only the physical and. operational elements but also the interface with the operating environment This. definition will be a concentrated initial focus of the process but it will also be revisited. on a continuing basis to assure that any design or environmental changes that may. occur over the duration of the design process are appropriately assessed for hazards . 6 0 HAZARD IDENTIFICATION, It is understood that we cannot assess and resolve hazards that have not been.
identified Hazard identification therefore can be considered the most critical step in. the process The process utilizes , Data from previous accidents case studies or operating experience. Scenario Development and judgment of knowledgeable individuals. Generic hazard checklists, Formal hazard analysis techniques. Design data and drawings, During the PHA development and after as design progresses the DEA IEI Safety. Team will frequently meet with the design Team to review the design and make a. determination if any system element requires a Failure Modes and Effects Analysis. FMEA to identify potential hazards Similarly the Team will use the operating. information available to it to perform any Operating Hazard Analysis OHA that may be. warranted If the Team continues past the end of Final Design it will monitor the. operating plan development and perform additional OHAs if warranted by changes to. 7 0 HAZARD ANALYSIS, Each identified hazard must be analyzed to determine its consequences severities . For severities other than negligible analysis must continue to determine probability. frequency of occurrence , DRAFT Revision 0, June 15 2006.
West Corridor LRT Final Design, Preliminary Hazard Analysis. Page 9 of 11, Occurrence of a single hazard may result in more than one consequence with each. The start of the Preliminary Hazard Analysis process the identification and analysis of hazards calls for a rational application of knowledge past experience and judgment on the part of those performing the tasks Experienced personnel performing hazard identification and analysis may sometimes differ on the assessment of the probability or

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