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Control of Industrial Major Accident Hazards (CIMAH) Report Page 11
Ranhill SAJ Sdn. Bhd. Revision 01
Part D: Information on the Potential Major Accident Date Aug 2019

drum include leakage through the valve stem, valve diaphragm, neck and the
outlet vapour tight cap. A partial failure of the Chlorine cylinder / drum could
also occur due to complete failure of the tank valve or leakage from the body
of the cylinder / drum.

D.2.2 Spontaneous Failures

A spontaneous failure involves the rupture or leak of containment without the
influence of external or handling events. Such failures may rise due to the following:
• Corrosion (internal or external);
• Stress corrosion;
• Fatigue;
• Defect arising during design, manufacturing, construction or maintenance;

• Previous operational overload, e.g. over-pressurization; and
• Previous mechanical damage.

D.2.3 External Events

External events are categorized as those events that are initiated externally from
KT1 & KT2 WTP. These are qualitatively assessed and described below:
• Severe Weather - the plant is not located in a cyclone area. The design
codes and standards to which the plant was designed ensure that there will
be no effect on the plant integrity for all foreseeable weather conditions.
• Earthquake - Malaysia is a low earthquake hazard area. Earthquakes
experienced not expected to have sufficient intensity to cause damage to the
plant. Thus, loss of containment is unlikely for the level of seismic activity in
this area.
• Ground Movement - since start of operations, there has not been any
significant subsidence problems and the likelihood of significant loss of
containment is considered to be unlikely based on the plant history. Any
observable ground movement would require the management of the facility to
conduct geotechnical investigation to ensure the integrity of buildings and
plant.
• Plane Crash - the plant is not located under a direct flight path although in a
flight corridor. As such, the potentiality of this event occurring is considered
low and no further evaluation is carried out.
• Third Party Activities - the plant is surrounded by palm oil and rubber
plantation. A small-scale rattan furniture factory located adjacent to the plant.
These activities are unlikely to pose any significant hazards to the activities
carried out by the plant.