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

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Updated Final Safety Analysis Report - (STS-004-002)Figure 4-2Containment Inerting Schematic4.2.5 Containment Performance RequirementsNo leak rate tests on the pressure containment have been performed since final shutdown November8, 1970.4.3 Reactor Compartment (Secondary Containment)4.3.1 General DescriptionAs shown in Figures 4-3 and 4-4, the reactor compartment surrounds the containment vessel andforms a secondary containment around the pressure containment. The concrete, lead andpolyethylene form the secondary shield. The volume enclosed by the concrete is the lower reactorcompartment or secondary shield area. This shield is described in 5.3.2.The principal auxiliary system associated with this compartment is the reactor space ventilation(RSV) system. It was installed during the spring 1963 outage. The system consists of twophysically independent sections. One section was for heat removal from the upper part of the reactorcompartment; the other section was for exhausting air from the reactor compartment.Rev. VI 36
Updated Final Safety Analysis Report - (STS-004-002)Figure 4-3Reactor Compartment4.3.2 Cooling SectionThe cooling (or upper reactor compartment recirculation) part of the RSV system is deactivated,disabled and performs no active function. It is located entirely in the reactor compartment. Two airintakes were provided. The recirculating air intake is on the port side at the A-deck level. The freshair intake was supplied by fan l-105-1 via regulating valve RS-40V. The recirculation fans (one is aspare) took suction on the intake manifold and discharge past the salt-water-cooled air cooling coilsinto a common header. This header distributed the air throughout the upper part of the reactorcompartment.Any ductwork or other components removed, as part of removing the RCP motors in 1971 orremoving the primary purification ion exchangers (demineralizers) in 1976, was not replaced.The water supply for the cooling coils (RS-C1 and RS-C2) was from the sea water pumps of theintermediate cooling water (CW) system. A booster pump RS-P5 provided additional head for thecooling water when required.4.3.3 Exhaust Section4.3.3.1 FunctionThe exhaust system of the RSV system is deactivated, disabled and performs no active function.It was part of the engineered safeguards for the ship. Its primary purpose was to retain anyparticulate and halogen fission products which may leak from the containment vessel. Theeffectiveness of its filter system was tested periodically to demonstrate desired efficiency foriodine and particulate removal.The exhaust section of the RSV system maintained the reactor compartment at a pressure ofapproximately 1 inch wg below the B-deck corridor pressure. The reactor compartmentpressure was below that of the surrounding shipboard areas and the containment vessel. Thisarrangement ensured that any containment vessel leakage was exhausted via the filter-adsorberbanks in the RSV system and not to the surrounding shipboard areas. The reactor compartmentRev. VI 37
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10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...

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