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

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Updated Final Safety Analysis Report - (STS-004-002)rotational forces and fore-and-aft motion. The support can thus accommodate thermalexpansion. Lateral support is provided at mid length by the collision mat, thereby preventingmovement due to the roll of the ship. The collision mat itself is composed of alternate layers ofone inch steel plates and three inch slabs of redwood. Structural chocks at C-deck level providelateral support and ensure that the containment remains in place at critical angles, includingthose in the capsized condition.The containment has 99 major penetrations and openings through the shell (See Table 4-1, Listof Containment Penetrations). Some of these are subdivided into several minor penetrations forelectrical or pneumatic service. All of the normal access and maintenance openings are locatedon the upper half of the vessel. Nearly all of the electrical and fluid penetrations pass throughthe lower half of the vessel.4.2.2.2 Structural DesignDesign of the pressure containment was based on the MCA conditions. Very early in the designphase of the project, the MCA was defined as the instantaneous release of the fluid energy in theprimary system while the reactor was at full power. The preliminary calculation for thiscondition resulted in a peak pressure of 186 psig. The containment shell and all penetrationswere designed for this pressure. Later, the accident was specifically defined as a primarysystem rupture having a flow area equal to the cross-sectional area of the largest primary pipe.Also included in the energy release was the fluid energy of one main steam generator. Since therupture area had been defined, the post-accident analysis was made time-dependent and theresultant peak pressure was determined to be 173 psig. The containment vessel hydrostatic testwas conducted at this pressure. Later analysis included the effects of a subsequently authorizedhigher maximum reactor power. It also included the effects of experimental data for postaccidentcondensing film heat transfer coefficients. The net effect of these two factors on thepeak pressure was a reduction to 160 psig. Hence, the shell thickness is approximately 15%greater than that which is required by Section VIII of the ASME Boiler and Pressure VesselCode. The design stress of the code is one-fourth of the ultimate tensile stress. The pressurecontainment detailed design calculations were reviewed and approved by the USCG and ABS.Maximum stresses in the containment vessel under full shielding and dynamic stress of a 30-degree roll are experienced in the main cylinder rings located 7 feet 6 inches forward and aft ofthe containment vessel center line and in the inner cylinder rings located 2 feet 6 inches forwardand aft of the center line. These stresses were determined by loading each element of the ringsections with vertical and horizontal loads at a 30-degree roll combined with the dynamic effectof this roll. Each ring was analyzed by use of strain-energy equations. The rings wereconsidered stable and statically determinate structures with unit loads applied to each redundantreaction and moment. Unit deflection equations were then obtained, which when equated tozero, resulted in simultaneous equations, whose solutions yielded the reactions and moments.The final moments in each element of the rings were found and since the section properties ofthe elements were known, the resulting bending stresses were obtained.Maximum stresses in the main cylinder ring are 16,000 psi in the inner flange and 8400 psi inthe outer shell of the ring section. These stresses occur when support is horizontal (90 degreesto the vertical). Maximum stresses in the cylinder partial ring sections are 20,500 psi in theinner flange of the ring and 6200 psi in the outer shell of the ring section. These stresses alsooccur when support is horizontal (90 degrees to the vertical).Rev. VI 32
Updated Final Safety Analysis Report - (STS-004-002)The torque developed by a dynamic 30-degree roll, is considered to be carried in the shell of thecontainment vessel as a shear in the shell. The shearing force resulting from this condition isresisted by the bolts located at the aft external support.Maximum stresses in the hemisphere rings are not appreciably affected by a 4-degree pitchcondition since the longitudinal center of pitch is located near the center line of the containmentvessel. The stress in these rings is 20,000 psi for a static condition at a point 90 degrees fromthe vertical.The external structural supports at 90 degrees to the vertical port and starboard are stressed to6000 psi by the reactions from the cylinder rings. These stresses occur in the D-deck transversemembers during a 30-degree roll condition.The external foundations of the containment vessel were designed to resist the reactions fromthe hydrostatic test. These reactions exceeded those experienced during a 30-degree roll. Thus,the containment vessel foundations are suitable for all loading conditions, since maximumreactions due to the hydrostatic test are the most critical reactions experienced by the externalfoundations.All internal equipment foundations are designed to stresses less than 12,500 psi for thecombined roll-and-pitch condition.4.2.2.3 Fabrication and Strength TestingThe cylindrical section, the two hemispherical heads and the cupola were fabricated as fourseparate units. All welds in each section were preheated and the roots and fillets were inspectedby Magnaflux methods. After completion of welding, all welds were radiographed and the foursections were stress-relieved. The sections were then lowered into the reactor compartment andwelded together manually by the same procedures used for the individual pieces. Since the finalassembly welding of the sections was on sections of plate whose thickness was less than 1½inches, no final stress relieving was required. Before installation of components in thecontainment, the completed vessel was hydrostatically tested at 173 psig with the penetrationscapped or plugged closed.The fabrication and welding procedures were reviewed by the USCG and the ABS. Siteinspectors were present during fabrication and testing of the vessel to ensure compliance withthe approved procedures.4.2.3 Containment Vessel PenetrationsThe containment penetrations, the containment isolation valves and their location and method ofoperation are listed in Table 4-1. No penetration has been tested since final shutdown November 8,1970.There are six openings which can be used for access or equipment removal. All but one (the doubledoorair lock) of these openings are bolted closures. The 42 inch double-door air lock permittedentering the containment without breaking containment integrity. In addition to the air lock, a 42inch diameter bolted hatch is located forward of the cupola. This hatch can also be used for accessand servicing of small equipment when the plant is shutdown. A CV entry shield plug can be placedon top of the upper airlock door and on top of the bolted hatch.A 13 ½ feet, full-diameter hatch at the top of the cupola is provided for major maintenance andrefueling operations. A 5½ feet diameter hatch is located in the top of the cupola for control rodRev. VI 33
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