AS 5059-2003

1 - AS 5059-2003 POWER STATION COOLING TOWER WATER SYSTEMS-MANAGEMENT OF LEGIONNAIRE'S DISEASE HEALTH RISK
4 - PREFACE
5 - CONTENTS
6 - FOREWORD
8 - SECTION 1 SCOPE AND GENERAL
8 - 1.1 SCOPE
8 - 1.2 OBJECTIVE
10 - 1.3 APPLICATION
10 - 1.4 REFERENCED DOCUMENTS
11 - 1.5 DEFINITIONS
11 - 1.5.1 Aerosol
11 - 1.5.2 Automatically controlled (water treatment)
11 - 1.5.3 Biocide
11 - 1.5.4 Bio-film
11 - 1.5.5 Blow-down (or bleed)
11 - 1.5.6 BOD
11 - 1.5.7 Chemical treatment
11 - 1.5.8 Clean
11 - 1.5.9 COD
11 - 1.5.10 Commissioning
11 - 1.5.11 Continuous
12 - 1.5.12 Cooling tower
12 - 1.5.13 Cooling (tower) water system
12 - 1.5.14 Dead leg
12 - 1.5.15 Drift
12 - 1.5.16 Generator
12 - 1.5.17 Grid
12 - 1.5.18 HCC (or total plate count)
12 - 1.5.19 Legionnaire's disease
12 - 1.5.20 Maintenance
12 - 1.5.21 Monitoring
12 - 1.5.22 Power station
12 - 1.5.23 Regulatory authority
12 - 1.5.24 Reporting
13 - 1.5.25 Should
13 - 1.5.26 TOC
14 - SECTION 2 DESIGN OF POWER STATION COOLING TOWER WATER SYSTEMS
15 - SECTION 3 MAINTENANCE OF WATER QUALITY AND CONTROL OF THE PRESENCE OF MICROORGANISMS
15 - 3.1 SCOPE
15 - 3.2 WATER QUALITY MANAGEMENT
15 - 3.2.1 Chemical treatment
15 - 3.2.2 Monitoring
15 - 3.2.3 Assessment
16 - 3.3 PRESENCE OF LEGIONELLA
16 - 3.3.1 Monitoring
16 - 3.3.2 Assessment
16 - 3.3.3 Control
17 - 3.4 PRESENCE OF OTHER HETEROTROPHIC BACTERIA
17 - 3.4.1 Monitoring
17 - 3.4.2 Assessment
17 - 3.4.3 Control
17 - 3.5 RESULTS AND RECORDS
17 - 3.6 EVIDENCE OF COMPLIANCE
18 - SECTION 4 RISK MANAGEMENT
19 - SECTION 5 DEVELOPMENT OF RISK MANAGEMENT PLAN
24 - SECTION 6 IMPLEMENTATION OF RISK MANAGEMENT PLAN
24 - 6.1 GENERAL
24 - 6.2 TREATING RISKS
25 - 6.3 WATER TREATMENT CONTROL STRATEGIES TO ADDRESS IDENTIFIED RISKS
26 - 6.4 MONITORING
27 - 6.5 REPORTING
27 - 6.6 COMMUNICATION
28 - 6.7 VERIFICATION
29 - SECTION 7 REVIEW OF RISK MANAGEMENT PLAN
30 - APPENDIX A - RISK CLASSIFICATION
30 - A1 GENERAL
30 - A2 RISK ANALYSIS
32 - APPENDIX B - SAMPLE RISK SCHEDULES
35 - APPENDIX C - INHERENT RISK EVALUATION
36 - APPENDIX D - COOLING WATER SAMPLING PROCEDURE
36 - D1 SCOPE
36 - D2 PERSONNEL CARRYING OUT SAMPLING
36 - D3 SAMPLE STORAGE AND TRANSPORT
36 - D4 PARTICULARS OF SAMPLING CONTAINERS
36 - D5 PARTICULARS OF SAMPLING
37 - D6 TECHNIQUE OF SAMPLE COLLECTION

Sets out control strategies for the management of Legionnaire's disease health risk from the cooling tower water supply systems of power stations connected to the national or regional grids usd to supply electricity for public consumption.

This Standard sets out control strategies suitable for the management of legionnaires disease health risk from the cooling tower water systems of power stations connected to the national or regional grids used to supply electricity for public consumption. It applies to the cooling tower water systems associated with (a) condensing systems of steam driven turbines driving electricity generators; and (b) main power station auxiliary plant such as coal pulverizing mills and turbine plant heat exchangers, where (i) a chemical dosing regime is applied to maintain the cleanliness of those systems and is demonstrably effective in the control of concentrations of Legionella bacteria; and (ii) shutdown for cleaning of those systems would require total or partial shutdown of electricity generation by the power station, which may not be practicable. The approach to management of legionnaires disease health risk set out in this Standard is based on the principles and generic process set out in AS/NZS 4360. This approach involves setting the context, identifying risks, then evaluating treating and monitoring risks, and ensuring that the information is communicated effectively. This Standard is not applicable to associated power station site services such as air-conditioning systems of buildings, or other relatively smaller cooling tower water systems in power stations, that can be taken out of service without affecting electricity generation. The AS/NZS 3666 series of Standards applies to microbial control in these systems. NOTE: This Standard does not prohibit the operation of associated site services that use condenser water from a main power generation cooling tower.

First published as AS 5059-2003.