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Control of Industrial Major Accident Hazards (CIMAH) Report Page 10
Ranhill SAJ Sdn. Bhd. Revision 01
Part D: Information on the Potential Major Accident Date Aug 2019

D.2.0 MAJOR ACCIDENT EVENT ANALYSIS

A diagram of the plant in which the industrial activity is carried on sufficient to
show the features which are significant as regards the potential for a major
accident or its prevention or control.

The sources of major accidents are analysed and reviewed. The hazardous
inventory stored on-site is Chlorine. Chlorine stored in cylinder and drum in the form
of liquefied compressed gas. Chlorine gas is toxic and green-yellow in color at room
temperature.

D.2.1 Loss of Containment

The inherent hazardous nature of certain chemicals could give rise to a range of
hazardous incidents. Under normal operation, hazardous chemicals are contained
within their containment systems (process equipment, storage vessels, tanks,
cylinders, pipelines, etc.) which are designed for this purpose, and there is no
immediate hazard. However, hazardous incidents could be initiated if there is
accidental loss of containment of these chemicals. One of the requirements for the
risk assessment is to identify all initiating events, such as loss of containment, and all
possible causes for such initiating events.

This section considers loss of containment events from Chlorine cylinder and drum
at the chlorine storage area in KT1 & KT2 WTP that have the potential to develop
into incidents with major accident effects.

Loss of primary containment events includes:

• Chlorine Cylinder / Drum Catastrophic Failure or Rupture
Chlorine cylinder / drum catastrophic failure or rupture represents a failure
that results in the instantaneous, or almost instantaneous, release of most or
the entire chlorine cylinder / drum content inside the Chlorine storage and
then release to the atmosphere where Chlorine gas disperses to the
surrounding environment.

• Chlorine Cylinder / Drum Partial Failure or Leak
Partial failure represents a leak (e.g, pinhole leak) from the Chlorine cylinder /
drum, resulting in a continuous release of its content inside the Chlorine
storage and then release to the atmosphere where Chlorine gas disperses to
surrounding environment. Potential leak points from the Chlorine cylinder /