10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...

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7.3 Steam GeneratorsUpdated Final Safety Analysis Report - (STS-004-002)Both steam generators consist of a steam drum and a U-tube, U-shell heat exchanger with primary pipingconnected to the inlet and outlet nozzles on the heads of the shell (see Figure 7-4).Figure 7-4Steam GeneratorThe shell side of the heat exchanger section is connected to a conventional steam drum above the heatexchanger by means of 13 risers and 8 downcomers. The risers and downcomers were designed to ensurenatural circulation at all loads and attitudes of the ship within the design pitch and roll conditions.Cyclone separators and scrubbers in the steam drum supplied dry saturated steam at the outlet nozzles.The entire steam generator is supported on saddles that are bolted to the primary system support structure.The primary water tubes are type-304 stainless steel. The steam drums, risers, downcomers and the shellside of the heat exchangers are carbon steel (USCG 51.04). The channel ends and the tube sheets werealso fabricated from carbon steel, but are clad on the inside with type-304 stainless steel. See 8.1 foradditional detail.The basic control for the steam generators was a three-element feed-water control that used steam flow,water flow and steam generator (boiler drum) level as controlling signals. Steam flow and feedwater flowmeasurements were compared by a ratio relay, which furnishes a signal to a standatrol. The standatrolRev. VI 66
Updated Final Safety Analysis Report - (STS-004-002)incorporated the effect of steam generator (boiler drum) water level and supplied the output signal thatcontrolled the feedwater flow.In March 1976, both steam generators and piping were drained as completely as practical. The water onthe secondary side of the steam generators was transferred to a double bottom tank below the reactorcompartment. The isolation valves outside of the containment vessel were shut.7.4 PressurizerAn electrically heated pressurizer (see Figure 7-5) was used to maintain the primary system pressure at1750 psia under normal steady-state conditions. The steam space of 92 cubic feet provided a surgevolume for the primary coolant and, in conjunction with the spray water and heaters, limited systempressure fluctuations. Liquid water (62 cu ft) in the pressurizer provided the expansion volume needed inoutsurges. The pressurizer limited load-change-induced pressure transients between 1695 and 1800 psia.The pressurizer was designed for a pressure of 2000 psig and a temperature of 650°F. The overall heightof the vessel is 18 feet, 11 inches and the inside diameter is 4 feet, 6 inches. The wall thickness is 3-5/8inches and the heads are 2-7/8 inches thick. The base material is type SA-212, grade B carbon steel cladwith 0.109 inch of type-304 stainless steel (SA-240, grade S).The pressurizer normally contained a two-phase mixture of water and steam. The lower section of thepressurizer contains electric heaters which evaporate the primary water contained in the pressurizer, thuscreating a pressure on the primary system through the outsurge nozzle in the bottom of the vessel. Aninsurge-outsurge line is connected (externally) to the bottom of the vessel and a spray line is connected(externally) to the top of the cylindrical shell section. Spray flow was controlled by the spray controlvalve, which was automatically controlled by the pressurizer pressure controller. Thermal sleeves areprovided in the insurge-outsurge nozzle and in the spray nozzle to protect the vessel shell from thermalshock during surges into the pressurizer.The pressurizer had three pressure relief valves. One of these, a pilot-actuated valve (PR-3V), wouldhave opened first in an excessive pressure surge (>1930 psia). A remotely operated isolation valve (PR-2V) was provided in series with the pilot-actuated relief valve. In addition to the pilot actuated valve,there were two spring-loaded, self-actuated relief valves (PR-1V & PR-24V) that were capable of1imiting a pressure surge if the pilot-actuated valve was inoperable. A three-way, motor-operatedshutoff, valve (PR-25V) was located between the pressurizer and the self-actuated pressure relief valvesto permit isolation of one, not both, of the valves. Each valve was designed to pass enough flow to limitsystem pressure to 2000 psig for the design maneuvering rate (load reduction of 100 to 20% full power in3 seconds with no control rod motion and no spray action).In March 1976, relief valve PR-1V was removed, the nozzle flanged and fitted with a vent, provided withan absolute filter to allow for pressure equalization. Circuit breakers for the heaters were tripped andtagged out at the switchboard.Rev. VI 67
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10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...

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