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 S
P m
m S
1.5 P +
P m
L B
- 2. Normal Operating Loadings Plus Hypothetical Earthquake Forces S
P D
m S ]
)
S P
( -
[1 1.5 P
D D
m 2
B
- 3. Normal Operating Loadings Plus Hypothetical Earthquake Forces Plus Pipe Rupture Loadings S
P L
m S ]
)
S P
( -
[1 1.5 P
L L
m 2
B 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 FABRICATION DIMENSIONAL CHARACTERISTICS OTHER DETAILS Assembly 15 x 15 Length 149 inches, distance between tie plates 140.9 to 141.7 inches, rod pitch 0.550 inch 216 fuel rods (typical), 8 guide bars, 1 instrumentation tube, assembly pitch 8.355 to 8.615 inches, 10 grid spacers, 9 within active fuel zone Grid spacers Zr-4 welded eggcrate with Inconel spring strips. High strength design Zr-4 welded eggcrate with Zircaloy integrated flow channels. High strength and high thermal performance design (HTP)
Outside dimension 8.195 inches square Batch R and S: Inconel grids mechanically fastened at bottom locations only Batch T and beyond: All zircaloy HTP spacers welded to the guide bars Lower tie plate Stainless steel casting Outside dimension 8.250 inches square, 2.4 to 3.2 inches high Reload R and beyond will have FUELGUARDTM 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 assembly Zr-4 tube, cold worked and stress relieved or M5 tube, fully recrystallized Length 142.0 to 142.7 inches, OD 0.417 inch, ID 0.367 inch Batch Y and beyond use M5 Fuel rod Total length 139.4 to 140.2 inches, active fuel length 131.80, plenum length 6.7 inches Batch R through W - active fuel length 132.6 inches and plenum length 6.83 inches 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 Rods pressurized to value that prevent collapse Beginning with Reload P for gadolinia rods and Reload Q for UO2 fuel, "axial blankets" are used. These "blankets" are lower enriched uranium at the ends of the rods.
Fuel Pellets Sintered UO2 or UO2-Gd2O3 pellets Diameter 0.35 inch 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 FABRICATION DIMENSIONAL CHARACTERISTICS OTHER DETAILS Cladding for fuel, Inert Rods Zr-4, tube cold worked and stress relieved or M5 tube, fully recrystallized OD 0.417 inch, ID 0.358 inch, wall thickness (min.) 0.0275 inch Batch R and beyond OD 0.417 inch, ID 0.367 inch, wall thickness (min.) 0.0225 inch Batch Y and beyond use M5 Poison Gadolinia None Mixed with UO2 Clearance available for fuel axial growth Reload R and beyond assemblies can be burnt to 58,900 MWD/MTU average assembly exposure without UTP 1.48 inches Consistent with projected batch burnup Shield Rod SAN Assemblies Stainless Steel Type 304 OD 0.417 inch Total Length 139.7 to 140.7 inches Solid SS rods may also be used as inert rods for fuel repairs Inert Rod (for Fuel Repair)
Zr-2, Zr-4, M5 or stainless steel may be used as rod filler Total Length 139.6 inches, OD 0.417 inch Plenum Length 6.7 inches Rod pressurized to a value that prevents collapse