Upload
fiona
View
32
Download
1
Tags:
Embed Size (px)
DESCRIPTION
Dome Hazard Analysis Discussion Jacques Sebag T&S Systems Engineer April 10, 2014. Second Safety Council Meeting April 10 and 11, 2014 | LSST Project Office N550. Introduction. Hazard Analysis Process (covered by Chuck Gessner) Focus on Dome Hazard Worksheet JIRA Action Example - PowerPoint PPT Presentation
Citation preview
1Second Safety Council Meeting • Tucson • 10-11 April 2014Name of Meeting • Location • Date - Change in Slide Master
Dome Hazard Analysis DiscussionJacques SebagT&S Systems Engineer
April 10, 2014
Second Safety Council MeetingApril 10 and 11, 2014 | LSST Project Office N550
2Second Safety Council Meeting • Tucson • 10-11 April 2014
Introduction
− Hazard Analysis Process (covered by Chuck Gessner) − Focus on Dome Hazard Worksheet− JIRA Action Example− Hazard Mitigations− Incorporation in the Dome Baseline Design− High Level Hazards linked with Project Risk Registry
3Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Facility M1M3 M2 Coating Dome Cam. Rooms TMA Cam-on-Tel Calibration Total
Hazard DistributionLow 0 1 0 1 0 0 0 0 0 2Medium 36 18 7 14 18 16 11 8 2 130Serious 13 1 11 2 9 0 20 14 6 76High 1 1 4 3 7 0 6 1 4 27total 50 21 22 20 34 16 37 23 12 223
0
50
100
150
200
250
Num
ber o
f Haz
ards
Ide
ntifie
d
T&S Hazard Assessment Distribution
Hazard Distribution
4Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Dome Hazard Distribution (Before Mitigation)
Row Labels High Serious Medium Grand TotalDome 7 9 18 34
Electrical 2 2Environment 2 1 3Mechanical - Glass Safety 2 1 3Mechanical 7 3 16 26
Grand Total 7 9 18 34
Category Count
Electrical 2
Environment 3
Mechanical - Glass Safety 3
Mechanical 26
Hazard Total 34
Dome Hazard Categories
Dome hazards distributed into 4 categories
Dome hazard distribution: Category vs Risk Level
5Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Dome High Level Hazards (Before Mitigation)
Row Labels High HazardsDome 7
Personnel falling from ladder while climbing toward the dome platform 1Personnel falling from walkway while accessing the light/wind screen from the arch girders. 1The cause is not important but personal rescue not possible using the ladders 1Personnel injured by dome shutter movement during maintenance of the dome shutters 1Personnel injured by light/wind screen movement during maintenance of the light/wind screen. 1Light/wind screen panels falls down on personnel and equipment during earthquake. 1Crane movement creates excessive jerking of loads due to rough control. 1
Grand Total 7
*
6Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Dome Serious Level Hazards (Before Mitigation)
Row Labels Serious HazardsDome 9
Electrical 2Capacitors are not fully discharged before personnel access to the inside of the capacitors or other capacitor ancillary equipment. 1Power ON during slip ring maintenance 1
Environment 2Lack of electrical power or slip ring damage 1Mechanical problem with drives 1
Mechanical - Glass Safety 2Dropped tools hit the mirrors 1Loss of M1M3 cart control while moving towards dome rear doors. 1
Mechanical 3Dome motion while personnel on dome platform 1Unprotected space between dome rear doors (opening size) and platform lift 1Dome crane moving during telescope operation 1
Grand Total 9
Shutter closure not possible
Glass Safety
Power ON during maintenance
Dome/Crane Motion and Platform Lift
7Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
JIRA Action for Mitigation Analysis
8Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Three Mitigation Types: Interlock, Design, Procedure
Interlock Type Column LabelsRow Labels x
Medium 7Serious 3
High 1Grand Total 11
Procedure Type Column LabelsRow Labels x
Medium 8Serious 5
High 5Grand Total 18
JIRA Action LIT-104:Create the full list of Safety
Procedure Mitigations
Design Type Column LabelsRow Labels x
Medium 17Serious 9
High 5Grand Total 31
9Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Design Mitigation Incorporation
Ladder System
Dome Maintenance Platform
Access walkwaysExterior Top Platform
10Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Ladder Systems with Intermediate Platforms and Safety Cable
Safety Cable
Intermediate Platforms
11Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Interface between Fixed and Rotating Ladders and Ducts
3” between ladders
Duct Interface to be designed by Dome vendor
Height: 11’
12Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Portable Davit Crane for Personnel Rescue
13Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Safety Tie Off Points for Light/Wind Screen Maintenance
Access walkways
Light/Wind Screen (upper)
Tie Off Points
Ladder for Roof Access
14Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Dome Exterior Top Platform
Upper Aperture Shutter Doors
15Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Dome Exterior Top Platform Access Hatch
Sliding Hatch
16Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Man-Lift available for Dome Maintenance
17Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
Light/Wind Screen Maintenance with Man-Lift
18Second Safety Council Meeting • Tucson • 10-11 April 2014Second Safety Council Meeting • Tucson • April 10-11 2014
High level Hazards Linked with Project Risk Registry
Row Labels High Grand TotalDome 7 7
PMO-257 6 6TS-062 1 1
Grand Total 7 7