Table of Contents

Table of Contents

1.0 Executive Summary

1.2 Methodology

1.2.1 Life Safety

1.2.2 Fire Protection

1.3 Conclusions

2.0 Description of Hall B

2.1 CLAS

2.1.1 Target and Beamline

2.1.2 Photon Tagging System

2.1.3 Drift Chambers

2.1.4 Magnet Coil

2.1.5 Time of Flight Scintillators

2.1.6 Calorimeters

2.1.7 Cerenkov Counters

2.1.8 High Voltage Systems

2.2 Multi-level Platforms

2.3 Cables and Cable Routing

2.4.1 Tagging Beam Dump

2.4.2 Faraday Cup

2.6 Labyrinth and Truck Access

2.7 Counting House

2.8 Vertical Cable Shaft

3.0 Conduct of Operations

3.1 Standard Operating Procedures

3.1.1 Operational Procedures Related to Fire Safety

3.1.2 Training of Personnel

3.1.3 Buddy System

3.1.4 Maintenance Plan for Auxiliary Fire Safety Systems

3.2 Modes of Operations/Description of Facility Use

3.2.1 Data Acquisition Periods

3.2.2 Maintenance

3.2.3 Public Tours

4.0 Fire Protection Approach

5.0 Life Safety/Emergency Egress

5.1 Occupancies

5.3 Maximum Travel Distance

5.4 Protection of Means of Egress

5.5 Emergency Lighting

5.6 Smoke Escape Masks

6.0 Combustible Inventory

6.1 Cable Insulation

6.1.1 Power Cables

6.1.2 Signal Cables

6.2 Scintillating Plastic

6.2.1 Time of Flight Scintillators

6.2.2 Calorimeters

6.3 Combustible Gas

6.4 Electronics Rooms Enclosures

6.5 Ordinary Combustibles

6.6 Other Combustibles

7.0 Potential Ignition Sources

7.1 Electrical Power

7.1.1 Drift Chamber On-board Electronics

7.1.2 High Current Fast Electronics

7.1.3 High Current Magnet Power Supplies

7.1.4 Miscellaneous Power Supplies and Instrumentation

7.1.5 Photomultiplier Tube Bases

7.1.6 Drift Chamber Wires

7.1.7 Static Electricity

7.1.8 Other Electrical Appliances

7.1.9 Lightning

7.1.10 Switches

7.3 Electro-Mechanical Device Failure

7.3.1 Pumps

7.3.2 Motors

8.0 Specific Fire Scenarios - Hazard Analysis and Risk Estimates

8.1 Drift Chamber Low Voltage On-board Electronics Ignites Cables

8.2 Drift Chamber Low-Voltage Power Ignites Cables at Disconnect

8.3 High Current Electronics Ignites Cables by Inadequate Connection

8.4 High Current Fast Electronics Ignites Cables by Sparking

8.5 Minitorus Magnet Supply Ignites Cables by Inadequate Connection

8.6 Pair Spectrometer Magnet Supply Ignites Cables by Sparks

8.7 Photomultiplier Tube Base Ignites Time-of-Flight Detectors

8.8 Transient Electrical Device Ignites Cable

8.9 Target Failure Causes Hydrogen Explosion by Sparks

8.10 Welding or Grinding Ignites Cable or Scintillator by Sparks

9.0 Hazard Mitigation

9.1 Administrative Controls

9.1.1 Hot Work Permit System

9.1.2 Training of Employees and Users

9.2 Hazard Minimization

9.2.1 Housekeeping

9.2.2 Fire Rated Cables

9.2.3 Connector Design

9.2.4 Cable Routing

9.3 Monitor Status of Hazards

9.3.1 PLC-Based Alarm Processor

9.3.2 VESDA

9.3.3 Hall B `Sniffer' System

9.3.4 Linear Heat Sensors on Fuels

9.3.5 Linear Heat Sensor on Magnet Leads

9.3.6 Closed Circuit TV System

9.3.7 Temperature Monitoring of Large Magnets

9.3.8 Temperature and Water Flow Monitoring for Beamline Magnet Supplies

9.3.9 Internal and External Power Supply Protection Circuits

9.4 Rapid & Definitive Manual Response

9.4.1 Emergency Access

9.4.2 Fire Extinguishers

9.4.3 Dry Standpipes

9.4.4 Fire Department Pre-plans

9.4.5 Fire Department Familiarization

9.4.6 TJNAF Staff Training

9.5 Passive Barriers

9.5.1 Accelerator Tunnel and Labyrinth Smoke and Fire Barriers

9.5.2 Non-Combustible Surfaces on Detector Components

9.5.3 Drift Chamber Endplate Inerting

9.6 Safety Systems

9.6.1 Beam Shutdown

9.6.2 Safety Design Features of the Cryogenic Target

9.6.3 Experiment Power Shutdown

9.7 Smoke Exhaust System

9.8 Appropriate Suppression Systems

9.8.1 Automatic Sprinklers in Space Frame and Front and Side Carriages

10.0 Conclusions

10.1 Facility is Safe to Operate

10.2 Level of Safety can be Improved

Appendix A Loss Calculations

Appendix B Future Upgrades

Section 1: Improved Suppression Coverage

Section 2: Improved Fire Detection Capability

Section 3: Improved Fire Barriers

Section 4: Improved Alarm Annunciation

Section 5: Miscellaneous Improvements

Appendix C Programmatic Fire Protection Features

Section 1: Jefferson Lab EH&S Manual - Rev. 3.1 - 12 SEP 1997 --- 6910 Fire Protection Program (June 1, 1996)

Section 2: Jefferson Lab EH&S Manual - Rev. 3.1 - 12 SEP 1997 --- Appendix 6910-T1 Building Fire-Protection Design (June 1, 1996)

Section 3: Appendix 6910-T3 Fire Protection Aspects of Planning and Property Acquisition (June 1, 1996)

Section 4: Jefferson Lab EH&S Manual - Rev. 3.1 - 12 SEP 1997 --- 6920 Safe Egress (March 4, 1995)

Section 5: Jefferson Lab EH&S Manual - Rev. 3.1 - 12 SEP 1997 --- 6930 Fire Protection Systems (March 4, 1995)

Appendix D Sitewide Fire Protection Features

Section 1: Newport News Fire Department

Section 2: Sitewide Fire Alarm Reporting System

Section 3: Water Supply

Appendix E Outline of Hall B Safety Training Program

Appendix F Contract Requirements for TJNAF Fire Safety

Appendix G External Consultations

Appendix H Fermilab Horizontal Cable Tray Fire Test Results

Appendix I Fire Characteristics of Hall B Fuels

Section 1: PVC - Polyvinyl Chloride

Section 2: PVT - Polyvinyl Toluene

Section 3: Polyethylene

Section 4: Teflon

Section 5: Lucite

Section 6: Cables

Appendix J Jefferson Lab Hot Work Program

Appendix K Fire Safety Inspection Checklist for Hall B

Section 1: Electronics rooms inspections:

Section 2: Smoke Masks

Section 3: Magnet Lead Junction Inspection

Section 4: Crate Power Supply Lead Junction Inspection

Appendix L Procedures for Responding to an Endstation Fire Alarm

Section 1: Full Alarms and Pre-alarms

Section 2: Pre-alarms

Section 3: Full Fire Alarms

Appendix M Elements of Hall B Maintenance for Safety-related Systems