Provision of legionella analysis and courier services for majuba power station

Majuba Power Station consists of evaporative cooling water systems which are designed to dissipate

heat from water by air contact, from condenser and air-conditioning systems. However, such

systems can provide an environment for the growth of many microorganisms, including Legionella.

Legionella causes Legionnaires disease which is a serious infection acquired by inhalation of water

droplets from cooling water systems that contain Legionella bacteria.. Legionella can grow and

spread in both open- and closed-circuit cooling tower system, thus periodic monitoring and control

is critical.

2. Supporting Clauses

2.1 Scope

This document details the scope of work for the service to provide Legionella analysis in water

samples for the period of 5 years.

2.1.1 Purpose

To describe the scope of work for the service to provide Legionella analysis in water samples for the

period of 5 years.

2.1.2 Applicability

Majuba Power Station only

2.1.3 Effective date

Effective date will be from the authorisation date.

2.2 Normative/Informative References

Parties using this document shall apply the most recent edition of the documents listed in the

following paragraphs.

2.2.1 Normative

[1] ISO 17025

[2] Chemistry and microbiology standard for cooling water -24055864767

[3] SANS 11731-2:2009 Water quality Detection and enumeration of Legionella

2.2.2 Informative

[4] Microbiological Methods Guideline- 240-55864831

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When downloaded from the document management system, this document is uncontrolled and the responsibility rests with the user to

ensure it is in line with the authorized version on the system. No part of this document may be reproduced in any manner or form by

third parties without the written consent of Eskom Holdings SOC Ltd, © copyright Eskom Holdings SOC Ltd, Reg No 2002/015527/30

Scope of Work for the Provision of Legionella Unique Identifier: 559-493510288

Analysis in Water Samples as per ISO 11731

Revision: 1

Page:

2.3 Definitions

Include all definitions applicable to this document, in alphabetical order. Explain all terms used,

including documents, titles and departmental references that may cause confusion if not explained.

Refer to definitions listed in recognized industry glossaries such as NRS 000 and the IEV, and use

these wherever appropriate.

For NRS 000, go to www.nrs.eskom.co.za. For the IEV, contact the Eskom Information Centre.

Definition Explanation

Legionella Microbial species that are Gram-negative bacilli

2.4 Abbreviations

Abbreviation Explanation

ISO International Standard Organisation

SANS South African National Standard

2.5 Roles and Responsibilities

Majuba Chemical Services

a) Compiles the scope of work.

b) Coordinates execution of the scope on site

c) Reviews technical submission provided by the contractor.

d) Contracts Manager for the execution of the scope of work as stipulated

2.6 Process for Monitoring

a) Customer Survey done by the contractor and is to be submitted to the employer to review

b) Key Performance Indicator Table as stipulated on the NEC document for the provision of

Legionella analysis.

2.7 Related/Supporting Documents

NEC document for the provision of Legionella analysis as per ISO11731

CONTROLLED DISCLOSURE

When downloaded from the document management system, this document is uncontrolled and the responsibility rests with the user to

ensure it is in line with the authorized version on the system. No part of this document may be reproduced in any manner or form by

third parties without the written consent of Eskom Holdings SOC Ltd, © copyright Eskom Holdings SOC Ltd, Reg No 2002/015527/30

Scope of Work for the Provision of Legionella Unique Identifier: 559-493510288

Analysis in Water Samples as per ISO 11731

Revision: 1

Page:

3. Provision of Legionella of service for the analysis in water samples as per ISO

11731 for 5 Years

Legionella bacteria are naturally present in all surface waters and can cause a pneumonia-like

disease,

which may be fatal. This risk is increased in the older people and immunocompromised.

Legionnaires disease can only be contracted when the bacteria is inhaled into the lungs in a form of

aerosol sized water droplets.

The water spray cooling zone of cooling towers is an area of increased risk due to the forced

minimisation of water droplet size to facilitate maximum cooling. The region around the cooling tower

where windage and spray comes to contact with personnel are the main areas of concern.

The SANS standard for Legionella specifies the need for continuous monitoring and control and

reduction of the Legionella. Legionella analysis cannot be conducted at any Eskom power Station

Laboratories until the laboratory is ISO 11731 accredited to be able to carry out the analysis.

3.1

a) Analysis of Legionella in water samples quarterly in an accredited Laboratory as per as per ISO

11731 as and when it is required.

b) To conduct confirmation test for all positive results as and when required as per ISO 11731

c) Contractor to provide sampling bottles for the legionella samples as per ISO 11731 as and when

required.

d) Contractor to provide detailed report for the analysis to the employer as and when analysis has

been completed with not later than 12 days turnaround time.

e) Contractor must submit laboratory accreditation certificate yearly for the Legionella analysis for

the laboratory that will be used to conduct the analysis to the employer.

f) Legionella samples must be collected quarterly and report analysis to be sent to the employer

not later those 12 days after samples collection.

g) All adhoc samples to be collected as and when employer requires and report analysis not later

than 12 days after samples collection.

CONTROLLED DISCLOSURE

When downloaded from the document management system, this document is uncontrolled and the responsibility rests with the user to

ensure it is in line with the authorized version on the system. No part of this document may be reproduced in any manner or form by

third parties without the written consent of Eskom Holdings SOC Ltd, © copyright Eskom Holdings SOC Ltd, Reg No 2002/015527/30

Scope of Work for the Provision of Legionella Unique Identifier: 559-493510288

Analysis in Water Samples as per ISO 11731

Revision: 1

Page:

4. Acceptance

Full Name and Surname Designation

Jeanette Makhanya Snr Chemist

Tshiki Mashabane Chemical Services Manager

5. Revisions

Date Rev. Compiler Remarks

November 2024 1 Nontobeko Nxumalo New Issue

6. Development Team

Nontobeko Nxumalo

7. Acknowledgements (if applicable )

Not Applicable.

CONTROLLED DISCLOSURE

When downloaded from the document management system, this document is uncontrolled and the responsibility rests with the user to

ensure it is in line with the authorized version on the system. No part of this document may be reproduced in any manner or form by

third parties without the written consent of Eskom Holdings SOC Ltd, © copyright Eskom Holdings SOC Ltd, Reg No 2002/015527/30

No specific requirements found