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1 and Licensee Event Report Evaluation LERs are submitted to the NRC by nuclear power plant operators for a number of reasons. Some of the reasons which are applicable to heat exchangers evaluated in this AMG include: • Any operation or condition prohibited by the pla n ts ' technical specifications. • Any event or condition that results in the condition of the nuclear power plant, including its principal safety barrier, being seriously degraded.

E. ) for process use. The spent fuel pool water in PWR plants contains 2000 to 2500 ppm boron. (3) Primary Water Treated water which has been deaerated/deoxygenated. This water may contain up to 200 ppb dissolved oxygen. Primary water in PWR plants also contains a borated solution. (4) Closed Cooling Water Treated water containing corrosion inhibitors and biocides. (5) Lubricating Oil Low to medium viscosity hydrocarbons used for bearing gear and engine lubricating. (6) Air The air is the surrounding ambient of various rooms, containment or the drywell.

Shell and tubes are made of austenitic stainless steel, and it is an all-welded construction. The unit is typically a multiple tube pass heat exchanger. Chemical and Volume Control Letdown Heat Exchanger m PWR Plants The letdown heat exchanger cools the letdown stream to the operating temperature of the mixed bed demineralizers. Reactor coolant (borated water) flows through the tube side of the exchanger while component cooling water flows through the shell side. All surfaces in contact with reactor coolant are austenitic stainless steel, and the shell is carbon steel.

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Aging Mgmt Guidelines - Commercial Nuclear Powerplant Heat Exchangers


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