Gauges and well logging Basic Safety Requirements IAEA

Gauges and well logging Basic Safety Requirements IAEA International Atomic Energy Agency Day 6 – Lecture 4

Objectives To give an understanding of the way design features, safety and warning systems, maintenance and safe working procedures contribute to the restriction of exposure IAEA 2

Content • • Design features Safety and warning systems Equipment maintenance Leak testing of sources Security and storage of portable equipment Safe working procedures Source handling IAEA 3

Design Features • Design features include: • shielding provided by the source housing • source shutter • features to prevent access IAEA 4

Source housing IAEA 5

Source shutter l l Rotating or sliding metal device to shield primary beam when not in use may be manually or electrically operated IAEA 6

Prevention of access • Prevention of access can be achieved by: • physical barriers • shielded panels • close positioning of source housing and detector • interlocked access gates IAEA 7

Prevention of access Physical barriers IAEA 8

Prevention of access Shielded panels IAEA 9

Prevention of access shielded panels IAEA 10

Prevention of access Positioning of source and detector IAEA 11

Prevention of access Positioning of source and detector IAEA 12

Safety and warning systems l Safety and warning systems include: n shutter condition warning lights n signs and notices IAEA 13

Shutter condition warning lights IAEA 14

Signs and notices IAEA 15

Equipment maintenance l Regular inspection and maintenance necessary to: n ensure smooth operation of source shutter n check general condition of gauge n check legibility of warning notices n check operation of any interlocks or warning lights n ensure that other equipment, such as transport case, is in good condition IAEA 16

Equipment maintenance Portable gauges l l l Checking that source has retracted properly Cleaning of gauge and source aperture Condition of transport case IAEA 17

Equipment maintenance Fixed gauges Routine Maintenance and Lubrication Non-Routine Maintenance and Lubrication survey meter Safety Checklist gauge disassembled Safety Checklist RPO Authorization Manufacturer’s Instructions Maintenance Procedures Approved Supplies Survey Meter Dosimetry? Training or supervison dosimeter IAEA 18

Equipment Maintenance Well logging Safety Checklist Survey Meter Dosimetry Remote Tool Sealed Source Survey Meter Procedures for removing “O” rings Jigs, remote tools “O” ring Jig or Support IAEA 19

Leak testing l l Sealed sources should be periodically tested for leakage Records of test should be kept IAEA 20

Security and storage of portable equipment • Consider security of fixed gauges • Consider security and storage of: • portable gauges • fixed gauges used on temporary sites IAEA 21

Security of portable gauges Constant surveillance when in use IAEA 22

Security of portable gauges l Suitable gauge store on each site IAEA 23

Security of portable gauges l Adequate surveillance during transport IAEA 24

Security of fixed gauges at temporary jobsites Radioactive Material, Special Form, N. O. S. UN 2974 DOT Type A At the Job Site During Transportation and Storage WARNING Contact Gauge. Tech before removing! IAEA 25

Security of fixed gauges WARNING Contact Gauge. Tech before removing! IAEA WARNING Contact Gauge. Tech before removing! 26

Security of well logging materials Downhole storage Locked above ground storage IAEA 27

Elements for Safe Working Procedures Portable gauges l l l l l Manufacturer instructions for use Routine and non-routine maintenance Instructions for safe use Radiation monitoring Access control Responsibilities Record keeping Emergency procedures and contacts Storage and transportation IAEA 28

Elements for Safe Working Procedures Fixed gauges l l l Manufacturer instructions for use Routine and non-routine maintenance Radiation monitoring Access control n Radiation Work Permits for entry to some areas Responsibilities Emergency procedures and contacts IAEA 29

Elements for Safe Working Procedures Well logging l l l l Security during storage and transportation Receipt and opening of packages Control and surveillance during use Source handling procedures Use of remote handling tools Radiation monitoring Access control Responsibilities IAEA 30

Elements for Safe Working Procedures Well logging l l l Record keeping Inspection and maintenance of equipment Emergency procedures and contacts n Abandonment procedures n Damaged source procedures IAEA 31

Well logging Sealed source handling Removing source from the transport container Loading source into transport container IAEA 32

Well logging Sealed source handling Installing sealed source into well logging tool Tightening sealed source to a specified torque IAEA 33

Well logging Sealed source handling Installing source cap to secure source and tightening to a specified torque Select proper source cap IAEA 34

Summary • Basic safety requirements to restrict exposure Ø design features Ø safety and warning systems Ø equipment maintenance Ø leak testing of sources Ø security and storage Ø safe working procedures Ø source handling • Any questions or comments? IAEA 35