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Extra info for Aging Mgmt Guidelines - Commercial Nuclear Powerplant Heat Exchangers
A gasket failure results in leakage. 3-25 AGING MANAGEMENT GUIDELINE FOR HEAT EXCHANGERS Qualification of other non-metallic materials is best handled by design review of materials in contact with the heat exchanger fluids and the environment. Elevated temperatures affect degradation of non-metallics such as oil and elastomers. These materials require controlled operating temperatures to function properly. As a rule, non-metallic materials can be qualified by surveillance tests when operating temperatures and transient/accident temperatures are nearly the same.
The fluids can be primary water, treated water, raw (service) water, borated water, closed cooling water, or lubricating oil. Fin-Coil Units This type of heat exchanger is used for containment or room cooling. In these heat exchangers, the water flows through the tubes, whereas the air in forced across the tube bundle. The flow of air is by lbrced convection, using t'ann. The type of exchanger tined in nuclear power plants in the finned coil type. In this arrangement, thc air flown across a finned tube bundle and is unmixed (meaning it cannot move freely) because it is confined in separatc flow passages during the process.
Plant-specific heat exchanger data was provided by fourteen units; of the fourteen, four provided maintenance and operating histories. This data was used for comparison of heat exchanger selection and for comparison to industry document summaries of maintenance and 3-1 A, ANG MANAGEMENT GUIDELINE FOR HEAT EXCHANGERS operation histories. Utility data compared favorably with heat exchanger selection and historical data. Table 3-1. ) Heat High Pressure Coolant Injection Gland Seal Condensers Emergency Core Cooling System Room Coolers High Pressure Coolant Injection Lubrication Oil Coolers Emergency Diesel Generator Jacket Water Coolers Miscellaneous Emergency Diesel Generator Lubrication Oil Coolers Oil Coolers Reactor Core Isolation Cooling Lubrication Oil Coolers Miscellaneous Reactor Water Cleanup Non-Regenerative Exchangers Residual Heat Removal Heat Exchangers (Note 3) Heat Reactor Water Cleanup Regenerative Heat Exchangers Oil Coolers Spent Fuel Pool Cooling Heat Exchangers Residual Heat Removal Heat Exchangers (Note 2) Spent Fuel Pool Cooling Heat Exchangers Notes: 1.
Aging Mgmt Guidelines - Commercial Nuclear Powerplant Heat Exchangers