SAFETY MANUAL - Tuv-fs.com
SAFETY MANUAL - Tuv-fs.com
SAFETY MANUAL - Tuv-fs.com
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<strong>SAFETY</strong> <strong>MANUAL</strong><br />
2.2.1.12 De<strong>com</strong>missioning<br />
The procedure for de<strong>com</strong>missioning the system shall be defined. This procedure is<br />
to include any specific requirements for the safe de<strong>com</strong>missioning of the system<br />
and, where applicable, the safe disposal or return of materials.<br />
As with <strong>com</strong>missioning, it is likely that the de<strong>com</strong>missioning be performed in a<br />
phased manner. The de<strong>com</strong>missioning procedure shall ensure that a plan be<br />
developed that maintains the functional safety whilst the corresponding hazards are<br />
present. Similarly, the installation environment of the control equipment shall be<br />
maintained within its operating envelope whilst it is required to function.<br />
• The de<strong>com</strong>missioning plan shall identify the sequence that the hazards<br />
are to be removed.<br />
• Methods shall be defined to ensure that the interaction between safety<br />
functions can be removed without initiating safety responses and still<br />
maintain safety functionality for the remaining potential hazards. This<br />
shall include the interaction between systems.<br />
• The de<strong>com</strong>missioning procedure shall define which modules/materials<br />
are to be returned for safe disposal following de<strong>com</strong>missioning.<br />
2.3 FUNCTIONAL <strong>SAFETY</strong> ASSESSMENT<br />
The functional safety assessment process shall confirm the effectiveness of the<br />
achievement of functional safety for the system. The functional safety assessment,<br />
in this context, is limited to the safety-related system and will ensure that the<br />
system is designed, constructed and installed in accordance with the safety<br />
requirements.<br />
Each required safety function and its required safety properties shall be considered.<br />
The effects of faults and errors within the system and application programs, failure<br />
external to the system and procedural deficiencies in these safety functions are to<br />
be considered.<br />
The assessments are to be undertaken by an audit team that shall include<br />
personnel outside of the project. At least one functional safety assessment shall be<br />
performed before the presence of the potential hazards, i.e. before start-up.<br />
Doc Number P8094<br />
Issue 14 September 2003 Page 35 of 67
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