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Seabrook Station Revision 18 to Updated Final Safety Analysis

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Seabrook Station Revision 18 to Updated Final Safety Analysis SEABROOK STATION UPDATED FINAL SAFETY ANALYSIS REPORT CHAPTER 5 REACTOR COOLANT SYSTEM AND CONNECTED SYSTEMS SECTIONS 5.1 Summary Descriptions 5.2 Integrity of Reactor Coolant Pressure Boundary 5.3 Reactor Vessel 5.4 Component and Subsystem Design SEABROOK REACTOR COOLANT SYSTEM AND CONNECTED SYSTEMS Revision 13 STATION Summary Description Section 5.1 UFSAR Page 1 5.1 SUMMARY DESCRIPTION The Reactor Coolant System (RCS), shown in Figure 5.1-1, Figure 5.1-2, Figure 5.1-3 and Figure 5.1-4, consists of four similar heat transfer loops connected in parallel to the reactor pressure vessel. Each loop contains a reactor coolant pump, steam generator and associated piping and valves. In addition, the system includes a pressurizer, pressurizer relief tank, pressurizer relief and safety valves, interconnecting piping and instrumentation necessary for operational control. All the above components are located in the Containment Building. During operation, the RCS transfers the heat generated in the core to the steam generators where steam is produced to drive the turbine generator. Borated demineralized water is circulated in the RCS at a flow rate and temperature consistent with achieving the reactor core thermal-hydraulic performance. The water also acts as a neutron moderator and reflector and as a solvent for the neutron absorber used in chemical shim control. The RCS pressure boundary provides a barrier against the release of radioactivity generated within the reactor, and is designed to ensure a high degree of integrity throughout the life of the plant. RCS pressure is controlled by the use of the pressurizer, where water and steam are maintained in equilibrium by electrical heaters and water sprays. Steam can be formed (by the heaters) or condensed (by the pressurizer spray) to minimize pressure variations due to contraction and expansion of the reactor coolant. Spring-loaded safety valves and power-operated relief valves from the pressurizer provide for steam discharge to the pressurizer relief tank, where the steam is condensed and cooled by mixing with water. a. Extent of the RCS 1. The reactor vessel, including control rod drive mechanism housings and incore instrumentation guide tubes 2. The reactor coolant side of the steam generators 3. Reactor coolant pumps 4. A pressurizer attached to one of the reactor coolant loops 5. Safety and relief valves 6. The interconnecting piping, valves and fittings between the principal components listed above 7. The piping, fittings and valves leading to connecting auxiliary or support systems up to and including the second isolation valve (from the high pressure side) on each line. SEABROOK REACTOR COOLANT SYSTEM AND CONNECTED SYSTEMS Revision 13 STATION Summary Description Section 5.1 UFSAR Page 2 b. Reactor Coolant System Components 1. Reactor Vessel The reactor vessel is cylindrical, with a welded hemispherical bottom head and a removable, flanged and gasketed, hemispherical upper head. The vessel contains the core, core supporting structures, control rods and other parts directly associated with the core. The vessel has inlet and outlet nozzles located in a horizontal plane just below the reactor vessel flange but above the top of the core. Coolant enters the vessel through the inlet nozzles and flows down the core barrel-vessel wall annulus, turns at the bottom and flows up through the core to the outlet nozzles. 2. Steam Generators The steam generators are vertical shell and U-tube evaporators with integral moisture separating equipment. The reactor coolant flows through the inverted U-tubes entering and leaving through the nozzles located in the hemispherical bottom head of the steam generator. Steam is generated on the shell side and flows upward through the moisture separators to the outlet nozzle at the top of the vessel. 3. Reactor Coolant Pumps The reactor coolant pumps are identical single speed centrifugal units driven by water/air cooled, three phase induction motors. The internal parts of the motor are cooled by air which is routed through external water/air heat exchangers. The shaft is vertical with the motor mounted above the pump. A flywheel on the shaft above the motor provides additional inertia to extend pump coastdown. The inlet is at the bottom of the pump and the discharge on the side. 4. Piping The reactor coolant loop piping is specified in sizes consistent with system requirements. The hot leg inside diameter is 29 inches and the inside diameter of the cold leg return line to the reactor vessel is 27½ inches. The piping between the steam generator and the pump suction is increased to 31 inches in inside diameter to reduce pressure drop and improve flow conditions to the pump suction. SEABROOK REACTOR COOLANT SYSTEM AND CONNECTED SYSTEMS Revision 13 STATION Summary Description Section 5.1 UFSAR Page 3 5. Pressurizer The pressurizer is a vertical, cylindrical vessel with hemispherical top and bottom heads. Electrical heaters are installed through the bottom head of the vessel while the spray nozzle, relief and safety valve connections are located in the top head of the vessel. 6. Safety and Relief Valves The pressurizer safety valves are of the totally enclosed pop-type. The valves are spring loaded, self-activated with back pressure compensation. The power-operated relief valves limit system pressure for a large power mismatch. They are operated automatically or by remote manual control. Remotely operated valves are provided to isolate the inlet to the power-operated valves if excessive leakage occurs. Steam from the pressurizer safety and relief valves is discharged into the pressurizer relief tank, where it is condensed and cooled by mixing with water near ambient temperature. 7. Pressurizer Relief Tank Refer to Subsection 5.4.11.2a. 8. Pressurizer Relief Tank Pump The PRT pump is an end suction centrifugal pump with TEFC Motor. The pump is used to circulate water through the PRT heat exchanger to cool the PRT following a discharge by the pressurizer SRVs or PORVS. The pump is also used to transfer the cooled fluid to the Liquid Waste Processing System. 9. Pressurizer Relief Tank Heat Exchanger This heat exchanger is a horizontal shell and tube type. It is cooled by primary component cooling water to remove heat from the PRT following a discharge by the SRVs or PORVs. c. Reactor Coolant System Performance Characteristics Tabulations of important design and performance characteristics of the RCS are provided on Table 5.1-1. SEABROOK REACTOR COOLANT SYSTEM AND CONNECTED SYSTEMS Revision 13 STATION Summary Description Section 5.1 UFSAR Page 4 d. Reactor Coolant Flow The reactor coolant flow, a major parameter in the design of the system and its components, is established with a detailed design procedure supported by operating plant performance data, by pump model tests and analysis, and by pressure drop tests and analyses of the reactor vessel and fuel assemblies. Data from all operating plants have indicated that the actual flow has been well above the flow specified for the thermal design of the plant. By applying the design procedure described below, it is possible to specify the expected operating flow with reasonable accuracy. Three reactor coolant flow rates are identified for the various plant design considerations. The definitions of these flows are presented in the following paragraphs. 1. Best Estimate Flow The best estimate flow is the most likely value for the actual plant operating condition. This flow is based on the best estimate of the reactor vessel, steam generator and piping flow resistance, and on the best estimate of the reactor coolant pump head-flow capacity, with no uncertainties assigned to either the system flow resistance or the pump head. System pressure drops, based on best estimate flow, are presented on Table 5.1-1. Although the best estimate flow is the most likely value to be expected in operation, more conservative flow rates are applied in the thermal and mechanical designs. 2. Thermal Design Flow Thermal design flow is the basis for the reactor core thermal performance, the steam generator thermal performance, and the nominal plant parameters used throughout the design. To provide the required margin, the thermal design flow accounts for the uncertainties in reactor vessel, steam generator and piping flow resistances, reactor coolant pump head, and the methods used to measure flow rate. The thermal design flow is approximately 4.5 percent less than the best estimate flow. The thermal design flow is confirmed when the plant is placed in operation. Tabulations of important design and performance characteristics of the RCS as provided on Table 5.1-1 are based on the thermal design flow. SEABROOK REACTOR COOLANT SYSTEM AND CONNECTED SYSTEMS Revision 13 STATION Summary Description Section 5.1 UFSAR Page 5 3. Mechanical Design Flow Mechanical design flow is the conservatively high flow used in the mechanical design of the reactor vessel internals and fuel assemblies. To assure that a conservatively high flow is specified, the mechanical design flow is based on a reduced system resistance and on increased pump head capability. For Seabrook, the mechanical design flow is approximately 4.0 percent greater than the best estimate flow. Pump overspeed, due to a turbine generator overspeed of 20 percent, results in a peak reactor coolant flow of 120 percent of the mechanical design flow. The overspeed condition is applicable only to operating conditions when the reactor and turbine generator are at power. e. Interrelated Performance and Safety Functions The interrelated performance and safety functions of the RCS and its major components are listed below: 1. The RCS provides sufficient heat transfer capability to transfer the heat produced during power operation and when the reactor is subcritical, including the initial phase of plant cooldown, to the Steam and Power Conversion System. 2. The system provides sufficient capability to transfer the heat produced during the subsequent phase of plant cooldown and cold shutdown to the Residual Heat Removal System.
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