ML21125A324
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FSAR CHAPTER 3 - REACTOR TABLE 3-1 Revision 21 Page 1 of 1 PRIMARY STRESS LIMITS FOR CRITICAL REACTOR VESSEL INTERNAL STRUCTURES Loading Combinations Allowable Stresses
- 1. Design Loading Plus Design Earthquake P m Sm PB + P L 1.5 Sm
- 2. Normal Operating Loadings Plus Pm SD Hypothetical Earthquake Forces 2
Pm )
P B 1.5 [1 - ( ] SD SD
- 3. Normal Operating Loadings Plus Pm SL Hypothetical Earthquake Forces Plus Pipe Rupture Loadings 2
Pm )
PB 1.5 [1 - ( ] SL SL Where:
PL, Pm, PB, Sm, Sy Are as Defined in the ASME Boiler and Pressure Vessel Codes,Section III, Article 4 Su = Minimum Tensile Strength of Material at Temperature SL = Sy + (1/3) (Su - Sy)
SD = Design Stress = 1.2 Sm
FSAR CHAPTER 3 - REACTOR TABLE 3-2 Revision 34 Page 1 of 2 FUEL BUNDLE COMPONENT DESCRIPTION COMPONENT MATERIAL AND DIMENSIONAL OTHER DETAILS FABRICATION CHARACTERISTICS Assembly 15 x 15 Length 149 inches, distance 216 fuel rods (typical), 8 guide between tie plates 140.9 to bars, 1 instrumentation tube, 141.7 inches, rod pitch assembly pitch 8.355 to 0.550 inch 8.615 inches, 10 grid spacers, 9 within active fuel zone Grid spacers Zr-4 welded eggcrate Outside dimension 8.195 inches Batch R and S: Inconel grids with Inconel spring square mechanically fastened at strips. High strength bottom locations only design Batch T and beyond: All Zr-4 welded eggcrate zircaloy HTP spacers welded with Zircaloy integrated to the guide bars flow channels. High strength and high thermal performance design (HTP)
Lower tie plate Stainless steel casting Outside dimension 8.250 inches Reload R and beyond will have TM square, 2.4 to 3.2 inches high FUELGUARD insert in lower tie plate Alignment pins Inconel X-750 Length 2.50 inches, projecting length 1.47 inches Upper tie plate Stainless steel casting Outside dimension 8.16 inches square, 3.29 inches high Guide bars Zr-4 annealed bar Total length 140.9 to 141.7 inches, width .398 inch, maximum depth .450 inch Instrument tube Zr-4 tube, cold worked Length 142.0 to 142.7 inches, Batch Y and beyond use M5 assembly and stress relieved or OD 0.417 inch, ID 0.367 inch M5 tube, fully recrystallized Fuel rod Total length 139.4 to Rods pressurized to value that 140.2 inches, active fuel length prevent collapse 131.80, plenum length 6.7 inches Beginning with Reload P for gadolinia rods and Reload Q Batch R through W - active fuel for UO2 fuel, "axial blankets" length 132.6 inches and plenum are used. These "blankets" length 6.83 inches are lower enriched uranium at the ends of the rods.
Batch X and beyond - active fuel length 132.6 inches and plenum length 6.79 inches Batch W and beyond - long upper end cap rods active fuel length 122.0 inches Fuel Pellets Sintered UO2 or UO2- Diameter 0.35 inch Gd2O3 pellets Batch R and beyond 0.36 inch
FSAR CHAPTER 3 - REACTOR TABLE 3-2 Revision 34 Page 2 of 2 FUEL BUNDLE COMPONENT DESCRIPTION COMPONENT MATERIAL AND DIMENSIONAL OTHER DETAILS FABRICATION CHARACTERISTICS Cladding for fuel, Zr-4, tube cold worked OD Batch Y and beyond use M5 Inert Rods and stress relieved or 0.417 inch, ID 0.358 inch, wall M5 tube, fully thickness (min.) 0.0275 inch recrystallized Batch R and beyond OD 0.417 inch, ID 0.367 inch, wall thickness (min.) 0.0225 inch Poison Gadolinia None Mixed with UO2 Clearance Reload R and beyond 1.48 inches Consistent with projected available for fuel assemblies can be batch burnup axial growth burnt to 58,900 MWD/MTU average assembly exposure without UTP Shield Rod SAN Stainless Steel OD 0.417 inch Total Length Solid SS rods may also be Assemblies Type 304 139.7 to 140.7 inches used as inert rods for fuel repairs Inert Rod (for Zr-2, Zr-4, M5 or Total Length 139.6 inches, Rod pressurized to a value that Fuel Repair) stainless steel may be OD 0.417 inch Plenum Length prevents collapse used as rod filler 6.7 inches