Page 432 - Offshore Electrical Engineering Manual

Background 419

• Issue to the duty holder any comments in respect of the Verification Scheme
(SCR Regulation 15A).
• Perform functions under the scheme (SCR Regulation 15(2)).
• Carry out a systematic examination of applicable PPE and plant (if not included
in a Combined Scheme) as defined within the duty holder WSET (PFEER
Regulations 18 and 19).

The engineer’s role as ICP could encompass some or all of the above – contract
requirements will dictate the exact nature of the role, and must be clearly understood.
Further, there may be more than one ICP appointed by the duty holder for a given
installation. In this instance engineers should ensure that their own scope, interfaces
(e.g., with other ICPs) and responsibilities are defined as far as possible.
In addition to the record of SECEs itself, the following inputs should be provided
by the duty holder in order to undertake the review:

• drawings of installation location/orientation,
• description of facilities and mode(s) of operation,
• equipment list and layout,
• hazard identification report and associated studies,
• Safety Case (if available for new-build projects).

Engineers should use the above to review the completeness and extent of the
MAH identification and determine whether, in their opinion as ICP, the systems and
equipment which have the potential to cause, or contribute substantially to, a major
accident have been identified as SECE. This assessment must be based upon conse-
quence of failure only, not on the likelihood of failure.
The engineer should then consider any systems or items of equipment that have not
been identified as safety-critical, for which the purpose is to limit the effect of a major
accident have been identified as Safety and Environmentally Critical Elements. This
does not mean that the only purpose of the system/item is to limit the effect of a major
accident. To be in a position to consider this, the engineer should have sufficient infor-
mation to understand the function of the system/item in terms of its ability to:

1. Prevent a major accident,
2. Detect a major accident,
3. Control a major accident,
4. Communicate during/after a major accident,
5. Mitigate the effects of a major accident.

The following methodology can be applied for confirming that prevention, detec-
tion, control or mitigation measures have been correctly identified as SECE:

• identify the major contributors to overall risk,
• identify the means to reduce risk,
• link the measures, the contributors to risk and the means to reduce risk to the
installations’ systems – these can be seen to equate to the SECE of the installation.