New PDF release: Aging Mgmt Guidelines - Commercial Nuclear Powerplant Heat

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Extra resources for Aging Mgmt Guidelines - Commercial Nuclear Powerplant Heat Exchangers

Sample text

_' " _-'- '" '" " - '" : " L ": -- Figure 3-2. 7]. 3-4 AGING MANAGEMENT GUIDELINE FOR HEAT EXCHANGERS Shell Doughnut _! Free area at disk Free area at doughnut Figure 3-3. 7]. thermal expansion between tubes and shell. Also, the tube bundle cannot be removed for cleaning. A different arrangement can overcome these drawbacks. In this arrangement, one tube plate is fixed but the other is bolted to a floating-head cover which permits the tube bundle to move relative to the shell. The floating tube sheet is clamped between the floating head and a flange so that it is possible to remove the tube bundle for cleaning.

The coolers circulate cooled air or nitrogen around critical drywell equipment. Each cooling coil is supplied by the closed cooling water system. Often the coils have two tube passes. The tubes are typically made of copper, while the fins are made of aluminum. Emergency Core Cooling Room Coolers - PWR and BWR PlanLs Air cooling units provide cooling for the Emergency Core Cooling System (ECCS) pump motors. 91. The ECCS room coolers are fan-coil units. The air flows across the cooling coils, where it is cooled, and continues then into a fan that returns it to the room.

The subassembly names corresponds with their general function. Commonly used materials of construction for each component are listed in Table 3-3. 4. ,, , Table 3-2. ' ,, Heat Exchanger , ..... , ,,,,,,, : ......... Component ,, , ,, j , Groups and Subcomponents Shell-and-Tube Heat Exchangers Tubes Tube Sheets Shell/Nozzles Shell Side Internals Floating Head Impingement Plates Tie Rods Baffle Plates/Partitions Pressure Boundary Fasteners/Flange Waterbox/Channel Head/End Bell Divider Plate Sacrificial Anodes Support Assembly Fin-Coil Heat Exchangers Coil Headers Nozzles Coils Tubes Fins 3-6 ,,, , ,,, , ,,,, , AGING MANAGEMENT GUIDELINE FOR HEAT EXCHANGERS ....

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Aging Mgmt Guidelines - Commercial Nuclear Powerplant Heat Exchangers


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