Leakage limited

Since leaks cannot be eliminated in vacuum systems, it is necessary to establish a leakage limit. A practical expression of this is that leakage should not exceed 10% of the minimum throughput for the system or ... 

The mobility classification of the equipment is another important factor affecting the products testing and construction requirements, such as impact and drop tests, leakage limits, enclosure strength, and labeling. The equipment categories are ... 

Pnmary circuit integration > leakage limitation Increased water inventory around the core, Satety injection automatic and passive... 

LOCA (Primary) Primary circuit integration > leakage limitation Safety injection ... 

Pnmaiy circuit integi ation leakage limitation... 

Primary cu cmt mtegration leakage limitation Increased water inventory above the core. 

State of the art in-service techniques are being introduced along with the development of justified plugging criteria and leakage limits. Monitoring systems are being improved. 

The leakage limit in the technical specification is based on SRL calculations of unstable crack length for the PWS and/or historical data. Technical Specifications 3.4.1 and 3.4.2 contain the information required by Charlotte Criteria DB 2.4 on leak detection capability and limiting conditions for operation. 

The allowable seat leakage and leakage testing methods for the isolation and check valves were given as preliminary constraints. These limitations were driven by the heat balance for the plant. Testing and additional analysis is needed to determine required seat leakage limits. Some backflow may be beneficial to maintain an idle loop warm. 

Testing and additional analysis is needed to determine required seat leakage limits. 

The valves will be subjected to thermal cycles and stresses induced by heat-ups and cool-downs. It was anticipated that approximately less than 5 testing and additional analysis is needed to determine required seat leakage limits. 0 heat-up/cool-down cycles would be experienced between the temperature extremes identified in Section 9.5.4.6 for each potential valve application. At least one heat-up cycle will occur from the minimum temperature specified in Section 9.5.4.7.1 to the maximum temperature specified In Section 9.S.4.6 for each potential valve application. 

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