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

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Updated Final Safety Analysis Report - (STS-004-002)4 CONTAINMENT4.1 IntroductionThe containment comprises a combination of compartments and equipment having the purpose ofminimizing release of radioactivity outside the ship following an accident. Prior to and followingdefueling in 1971, this system has been the NSS’s principal engineered safeguard. During the NSS’soperating period, its performance and reliability were vital to safety of the ship and the surroundingenvironment. The containment is divided into two parts: the primary containment (containment vessel)and the reactor compartment (secondary containment).4.2 Primary Containment (Containment Vessel)4.2.1 Function and General Design CriteriaThe function of the primary containment was to minimize the release of fission products after aserious accident. During the operating phase, the Maximum Credible Accident (MCA) was theaccident that would have resulted in the greatest potential hazard to the general public. The entireprimary system and all primary components are located inside the pressure containment (Figure 4-1).A major failure of the primary system (i.e., instantaneous, complete, transverse shear of primarysystem pipe) in the MCA would have been followed by rapid flashing of the primary coolant wateras it was released to the containment. A major portion of the coolant would have escaped and causedthe containment pressure to rise. As decay heat was added to the core, lack of adequate coolingwould have resulted in an increased core temperature. Ultimately, failure of the cladding would havereleased fission product to the primary system and containment.Although the containment must necessarily have access openings and service penetrations wheresome finite amount of leakage is possible, the pressure containment was designed to hold the largestpossible quantity of these fission products. The following criteria were established for the pressurecontainment:1. The containment was sealed at all times during plant operation and no entrance was permitteduntil the plant had been shut down and the radiation had been reduced to a safe level.2. Design pressure of the containment vessel was determined by expansion of the primary fluidfrom the entire primary system and of the secondary fluid from one steam generator. The blowdownoccurs through a postulated pipe rupture.3. No high-temperature piping containing primary water was permitted to penetrate thecontainment vessel.4. Electrical containment penetrations were designed to withstand the containment design pressureand temperature.5. Fluid penetrations and piping outside the containment up to and including the first shutoff valvewere designed to withstand the containment design pressure and temperature.6. Any equipment inside the containment vessel that might fail or give trouble during plantoperation was installed either in duplicate or in such a manner that the faulty equipment may beisolated from the rest of the plant without hindering the plant operation.7. The shell and all its penetrations were designed in accordance with American Bureau ofShipping (ABS) Rules, United States Coast Guard (USCG) regulations and American Societyof Mechanical Engineers (ASME) requirements.Rev. VI 30
Updated Final Safety Analysis Report - (STS-004-002)Figure 4-1Arrangement of Principal Components in Containment1 Heat Exchanger (SteamGenerator U-tube bundle)2 Let Down Cooler 3 Steam Drum (SteamGenerator)4 Effluent Condensing Tank 5 Containment Drain Tank 6 Pressurizer7 Check Valve 8 Primary Pump 9 Gate Valve4.2.2 Containment Vessel4.2.2.1 DescriptionThe containment vessel (See Figure 4-2) is a horizontal cylinder with hemispherical endshaving an outside diameter of 35 feet 4¾ inches and a length of 50 feet 8½ inches. It has acentrally mounted vertical cylinder 13 feet 6 inches in diameter extending 16 feet 6 inchesabove the horizontal cylinder. The gross volume of the containment is approximately 40,000cubic feet and the net free volume is approximately 31,200 cubic feet. The containment vesselbulkhead thicknesses vary from a minimum of 1¼ inches at the hemispherical ends to 3¾inches in the cylindrical portion of the vessel.The vessel lies fore and aft on the ship’s center line, 18 inches above the inner bottom. It restsin a saddle-shaped support, which is integral with the ship’s structure and is secured only at thebottom at the after end of the cylindrical section. This connection provides resistance toRev. VI 31
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10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...

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