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 DomeCam.

Rooms TMA Cam-on-Tel Calibration Total

Hazard Distribution

Low 0 1 0 1 0 0 0 0 0 2

Medium 36 18 7 14 18 16 11 8 2 130

Serious 13 1 11 2 9 0 20 14 6 76

High 1 1 4 3 7 0 6 1 4 27

total 50 21 22 20 34 16 37 23 12 223

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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

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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

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Ladder Systems with Intermediate Platforms and Safety Cable

Safety Cable

Intermediate Platforms

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Interface between Fixed and Rotating Ladders and Ducts

3” between ladders

Duct Interface to be designed by Dome vendor

Height: 11’

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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

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Dome Exterior Top Platform

Upper Aperture Shutter Doors

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Dome Exterior Top Platform Access Hatch

Sliding Hatch

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Man-Lift available for Dome Maintenance

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Light/Wind Screen Maintenance with Man-Lift

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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