2010:37 Utvärdering av regler och normer för betongkonstruktioner i ...
2010:37 Utvärdering av regler och normer för betongkonstruktioner i ...
2010:37 Utvärdering av regler och normer för betongkonstruktioner i ...
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6.6 Storbritannien<br />
En sammanfattning <strong>av</strong> det brittiska regelverket ges i <strong>av</strong>snitt 4.3.3.<br />
6.6.1 Safety Assessment Principles, SAP<br />
British Standard ger ej ut några kärnkraftsspecifika regelverk <strong>av</strong>seende reaktorinneslutningar<br />
<strong>av</strong> betong (förutom för inneslutningskärl för gaskylda reaktorer<br />
10 ) eller andra säkerhetsrelaterade byggnader vid kärnkraftsanläggningar.<br />
Vad som finns att tillgå är istället SAP respektive TAG utgivna <strong>av</strong> HSE . I<br />
detta <strong>av</strong>snitt berörs SAP medan TAG behandlas i nästa <strong>av</strong>snitt. I SAP redovisas<br />
bland annat ”Engineering Principles”. Engineering principle ECS.3 anger<br />
följande vad gäller regelverk generellt:<br />
”Structures, systems and components that are important to safety should<br />
be designed, manufactured, constructed, installed, commissioned, quality<br />
assured, maintained, tested and inspected to the appropriate standards.”<br />
Vidare anges att:<br />
“Appropriate national or international codes and standards should be<br />
adopted for Classes 1 and 2 of structures, systems and components. For<br />
Class 3, appropriate non-nuclear-specific codes and standards may be applied.”<br />
“Codes and standards should be preferably nuclear-specific codes or<br />
standards leading to a conservative design commensurate with the importance<br />
of the safety function(s) being performed. The codes and standards<br />
should be evaluated to determine their applicability, adequacy and<br />
sufficiency and should be supplemented or modified as necessary to a<br />
level commensurate with the importance of the safety function(s) being<br />
performed.”<br />
Slutligen ger man i Engineering principles ECS.4 <strong>och</strong> ECS.5 följande möjligheter:<br />
”For structures, systems and components that are important so safety, for<br />
which there are no appropriate established codes or standards, an approach<br />
derived from existing codes or standards for similar equipment, in<br />
applications with similar safety significance, may be applied.”<br />
“In the absence of applicable or relevant codes and standards, the results<br />
of experience, tests, analysis, or a combination thereof, should be applied<br />
to demonstrate that the item will perform its safety function(s) to a level<br />
commensurate with its classification.”<br />
Det <strong>av</strong>snitt i SAP som specifikt berör Civil Engineering ger ingen ytterligare<br />
ledning, utan man specificerar endast att:<br />
10 British Standard ger ut en standard <strong>av</strong>seende inneslutningskärl för<br />
gaskylda reaktorer BS 4975:1990 Specification for prestressed<br />
concrete pressure vessels for nuclear engineering. Denna typ <strong>av</strong> reaktorer<br />
ingår emellertid ej i föreliggande uppdrag, vilket endast behandlar<br />
vattenkylda reaktorer.<br />
SSM <strong>2010</strong>:<strong>37</strong><br />
60