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System
Design Descriptions
The System Design
Description documents contain all the relevant design information
for the system under consideration. They will be the reference documents
for the system. The documents should cover the following general
topics:
- Scope. A
statement on the extent of the system to which this document is
applicable. Perhaps more importantly, it maybe necessary to
explicitly state the areas that the document will not be addressing
and identify the references that contain the information not covered
in this document.
- Requirements. It
is likely that the system will have been designed against a set
of requirements and these should be stated.
- Functions. The
design functions and system safety functions should be derived and
stated.
- System
Description. An arrangement description should be given of the
design of the system, giving sufficient detail and addressing component
parts as necessary to allow personnel to become familiar with the
way the system is designed to work. Reference should be made
to system diagrams, electrical power, and control and Instrumentation
aspects of the system design, as considered necessary to convey an
understanding of how the system works. Other aspects of the
system design such as particular materials, fire prevention, noise
attenuation and equipment mounting arrangements may also be relevant.
- Operation.
The operation of the system should be described at a level that
will give an overview and guidance through normal, abnormal and
emergency operating modes. Performance information should
be given in this section although the detailed operating limits
should be included in Section 6.
- Design
Parameters and Component Specifications. This section provides
the trace of the design evolution and provides the specification
of the components and the system. It details the physical
and performance limits that are applicable to the equipment components
and the system. This section may include references to further
documents containing design or stress calculations, metallurgical
analysis, radiography results, etc.
- Failure
Mode Analysis. This section should describe the effects
of failure of the major components of the system, on the operation
of the system. The effects of system failure on the operation
of the plant will be addressed in the Base Safety Reports.
The Failure Mode Analysis will also identify the means of failure
and commonly will present a Fault Schedule.
- Testing. Any
prototype testing, production testing or first-of-class tests required
will be detailed here, as well as the results of the tests and the
analysis of the test results.
- References.
This section will contain references to any necessary supporting
documents.
Safety
Principles Papers
(SPPs)
The Safety Principles Papers are the foundation documents on which
the Safety Case is built. The content of the Safety Principles
Papers should present the general structure of the Safety Case and
describe, for the particular system under consideration, how the Safety
Case will be demonstrated and how the evidence will be compiled and presented.
Generally the structure of the documents will be pre-defined by the
Management System controlling the overall process but should this
not be the case then the following headings would form a skeletal
synopsis for the Safety Principles Paper:
•
Scope
of the document
•
Purpose
of the document within the safety case
•
System/equipment
interfaces
•
Duration,
or time boundary, of applicability
•
Safety
objectives and functionality
•
Any mandated
safety requirements
•
Conditions
under which the system must operate
•
Specific
design codes applicable
•
Specific
safety standards applicable
•
Safety
Justification scope and acceptance criteria:
~
Hazard
Analysis and Assessment
~
Reliability
Analysis and Assessment
•
Compliance
statements
•
References
T&IP Ltd
can demonstrate experience in the research, compilation and presentation
of Safety Principles Papers for a diversity of systems covering the
following general system areas:
•
Hydraulic Systems
•
High-energy
Pneumatic Systems
•
Cooling Water
Systems
•
High-energy
Steam Propulsion Systems
•
Lubricating
Oil Systems
•
Refrigeration
Systems
•
Diesel Engine
Systems
•
Hotel and Domestic
Services
Base
Safety Reports (BSRs)
While the Safety Principles Papers provide the strategy
and the type of evidence that will be provided, the Base Safety Reports
are the presentation and demonstration of that evidence. The Base
Safety Report will present the evidence that the objectives set in the SPP have been met and that the safety of the system or equipment under
consideration has been demonstrated.
Generally the structure of the documents will be pre-defined by the
Management System controlling the overall process and will follow-on
from the Safety Principles Papers.
It is very likely that the evidence supporting the conclusions presented
in the Base Safety Report will be held in other documents (such as System Design Descriptions)
and these documents must be referenced within the BSR.
As they support the arguments on which the Safety Justification
is based, they should also be contained within the relevant Live Files.
The Base Safety Reports are the manifestation of the logical arguments
and evidence that provide the Safety Justification and T&IP Ltd
can demonstrate relevant experience in the research and preparation
of Base Safety Reports for a variety of systems as defined in the system
areas. Could our knowledge and expertise assist
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