ML103610286

(WBN) Unit 2 - Final Safety Analysis Report (FSAR) - Response to Request for Additional Information

ML103610286
Person / Time
Site:	Watts Bar
Issue date:	12/21/2010
From:	Bajestani M Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML103610286 (12)

Text

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 December 21, 2010 10 CFR 50.4(b)(6) 10 CFR 50.34(b)10 CFR 2.390(d)(1)

U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 NRC Docket No. 50-391

Subject:

Watts Bar Nuclear Plant (WBN) Unit 2 -Final Safety Analysis Report (FSAR) -Response to Request for Additional Information This letter responds to the following NRC staff request for additional information (RAI) provided verbally concerning the Unit 2 FSAR: NRC RAI Why are the Unit 2 core source terms different from the Unit I core source terms?RESPONSE The core source terms for Unit 1 and Unit 2 are different primarily because Unit 1 is producing Tritium and Unit 2 will not produce Tritium. Due to the specialized equipment required to produce Tritium, the Tritium production core contains different materials than the standard core.In addition, a different fuel cycle is required for Tritium production as compared to the standard core (i.e., fuel effective full power days [EFPDs] burnup is different for the two cores). Thus, the isotopic mix is different in the two cores.Enclosure 1 provides a listing of the Tritium production core (Unit 1) isotopic inventory and Enclosure 2 provides a listing of the standard core (Unit 2) isotopic inventory.

There are no new regulatory commitments contained in this letter. If you have any questions, please contact William Crouch at (423) 365-2004.

U.S. Nuclear Regulatory Commission Page 2 December 21, 2010 I declare under penalty of perjury that the foregoing is true and correct. Executed on the 211' day of December, 2010.Sincerely, Masoud B jstani Watts Bait 2 Vice President Enclosure 1: Tritium Production Core (Unit 1) Inventory Enclosure 2: Standard Core (Unit 2) Inventory cc (Enclosures):

U. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 NRC Resident Inspector Unit 2 Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381 ENCLOSURE 1 Tritium Production Core (Unit 1) Inventory Total Core 1X Burned 2X Burned 3X Burned Nuclide Inventory (Ci) (Ci/Assy) (Ci/Assy) (Ci/Assy)1 Kr-83m 1.23E+07 7.63E+04 5.15E+04 6.13E+04 2 Kr-85m 2.69E+07 1.69E+05 1.10E+05 1.25E+05 3 Kr-85 8.81 E+05 3.56E+03 5.54E+03 6.84E+03 4 Kr-87 5.23E+07 3.31 E+05 2.11 E+05 2.36E+05 5 Kr-88 7.38E+07 4.68E+05 2.97E+05 3.31 E+05 6 Kr-89 9.1OE+07 5.81 E+05 3.63E+05 3.97E+05 7 Kr-90 9.01 E+07 5.76E+05 3.59E+05 3.92E+05 8 Xe-131m 9.54E+05 5.31 E+03 4.56E+03 6.18E+03 9 Xe-133m 5.80E+06 3.41E+04 2.60E+04 3.45E+04 10 Xe- 133 1.88E+08 1.11E+06 8.36E+05 1.09E+06 11 Xe-135m 3.59E+07 2.08E+05 1.63E+05 2.19E+05 12 Xe-135 4.96E+07 2.84E+05 2.30E+05 2.19E+05 13 Xe-137 1.65E+08 9.75E+05 7.30E+05 9.51 E+05 14 Xe-138 1.59E+08 9.55E+05 6.93E+05 8.79E+05 15 Xe-139 1.26E+08 7.57E+05 5.43E+05 6.83E+05 16 Xe-140 8.32E+07 5.07E+05 3.54E+05 4.36E+05 17 1-130 2.34E+06 9.02E+03 1.51 E+04 3.14E+04 18 1-131 9.01E+07 5.24E+05 4.09E+05 5.49E+05 19 1-132 1.31 E+08 7.63E+05 5.89E+05 7.87E+05 20 1-133 1.88E+08 1.11 E+06 8.35E+05 1.09E+06 21 1-134 2.08E+08 1.23E+06 9.18E+05 1.19E+06 22 1-135 1.76E+08 1.04E+06 7.81 E+05 1.02E+06 23 I-136m 5.05E+07 3.02E+05 2.21 E+05 2.83E+05 24 Br-83 1.23E+07 7.63E+04 5.14E+04 6.11 E+04 El-1 ENCLOSURE1 Tritium Production Core.(Unit

1) Inventory Total Core 1X Burned 2X Burned 3X Burned Nuclide Inventory (Ci) (Ci/Assy) (Ci/Assy) (Ci/Assy)25 Br-84m 6.68E+05 3.86E+03 3.06E+03 4.13E+03 26 Br-84 2.18E+07 1.37E+05 8.95E+04 1.03E+05 27 Br-85 2.65E+07 1.67E+05 1.08E+05 1.23E+05 28 Br-87 4.40E+07 2.79E+05 1.77E+05 1.98E+05 29 Cs-134 1.12E+07 3.13E+04 8.41 E+04 1.48E+05 30 Cs-135 3.60E+01 1.30E-01 2.42E-01 3.48E-01 31 Cs- 136 3.67E+06 1.53E+04 2.24E+04 4.57E+04 32 Cs-137 8.81 E+06 3.34E+04 5.76E+04 7.66E+04 33 Cs- 138 1.75E+08 1.05E+06 7.67E+05 9.80E+05 34 Cs- 139 1.66E+08 9.95E+05 7.27E+05 9.28E+05 35 Cs-140 1.49E+08 8.95E+05 6.53E+05 8.32E+05 36 Cs-141 1.12E+08 6.75E+05 4.86E+05 6.14E+05 37 Rb-88 7.48E+07 4.74E+05 3.02E+05 3.37E+05 38 Rb-89 9.64E+07 6.13E+05 3.87E+05 4.29E+05 39 Rb-90m 2.13E+07 1.33E+05 8.74E+04 1.01 E+05 40 Rb-90 9.41 E+07 6.OOE+05 3.76E+05 4.13E+05 41 -Rb-91 1.15E+08 7.28E+05 4.66E+05 5.24E+05 42 Se-84 2.12E+07 1.33E+05 8.66E+04 9.93E+04 43 Sr-89 1.02E+08 6.47E+05 4.06E+05 4.54E+05 44 Sr-90 6.94E+06 2.78E+04 4.40E+04 5.45E+04 45 Sr-91 1.23E+08 7.72E+05 4.99E+05 5.68E+05 46 Sr-92 1.31 E+08 8.14E+05 5.39E+05 6.27E+05 47 Sr-93 1.45E+08 8.97E+05 6.08E+05 7.26E+05 48 Sr-94 1.36E+08 8.39E+05 5.75E+05 6.92E+05 E1-2 ENCLOSURE1 Tritium Production Core (Unit 1) Inventory Total Core 1X Burned 2X Burned 3X Burned Nuclide Inventory (Ci) (Ci/Assy) (Ci/Assy) (Ci/Assy)49 Y-90 7.21 E+06 2.89E+04 4.57E+04 5.78E+04 50 Y-91 m 7.11 E+07 4.48E+05 2.90E+05 3.30E+05 51 Y-91 1.29E+08 8.12E+05 5.23E+05 5.99E+05 52 Y-92 1.31E+08 8.17E+05 5.41 E+05 6.30E+05 53 Y-93 1.49E+08 9.16E+05 6.23E+05 7.46E+05 54 Y-94 1.48E+08 9.07E+05 6.28E+05 7.63E+05 55 Y-95 1.57E+08 9.54E+05 6.72E+05 8.31 E+05 56 Y-96 1.48E+08 8.99E+05 6.38E+05 7.93E+05 57 Zr-95 1 .64E+08 9.97E+05 7.05E+05 8.71 E+05 58 Zr-97 1.57E+08 9.38E+05 6.89E+05 8.83E+05 59 Nb-95 1.66E+08 1.OOE+06 7.13E+05 8.78E+05 60 Nb-97m 1.49E+08 8.89E+05 6.53E+05 8.38E+05'61 Nb-97 1.58E+08 9.45E+05 6.95E+05 8.92E+05 62 Mo-99 1.68E+08 9.93E+05 7.48E+05 9.80E+05 63 Tc-99m 1 .47E+08 8.70E+05 6.55E+05 8.58E+05 64 Tc-99 1.1 2E+03 4.36E+00 7.23E+00 9.15E+00.65 Tc-101 1.54E+08 8.96E+05 6.94E+05 9.29E+05 66 Ru-103 1.31 E+08 7.25E+05 6.28E+05 8.97E+05 67 Ru-105 8.13E+07 4.21 E+05 4.19E+05 6.55E+05 68 Ru-106 3.56E+07 1.37E+05 2.30E+05 3.49E+05 69 Ru-107 4.33E+07 2.08E+05 2.38E+05 3.96E+05 70 Rh-103m 118000000 653000 566000 808000 71 Rh-105m 22800000 118000 117000 183000 72 Rh-105 7.59E+07 3.92E+05 3.92E+05 5.92E+05 E1-3 ENCLOSURE1 Tritium Production Core (Unit 1) Inventory Total Core 1X Burned 2X Burned 3X Burned Nuclide Inventory (Ci) (Ci/Assy) (Ci/Assy) (Ci/Assy)73 Rh-106 3.94E+07 1.58E+05 2.49E+05 3.93E+05 74 Rh-107 4.35E+07 2.09E+05 2.39E+05 3.98E+05 75 Sn-130 3.14E+07 1.81 E+05 1.43E+05 1.95E+05 76 Sb-127 8.87E+06 4.88E+04 4.30E+04 6.26E+04 77 Sb-129 2.77E+07 1.56E+05 1.30E+05 1.82E+05 78 Sb-130m 41600000 240000 190000 259000 79 Sb-130 8.97E+06 5.04E+04 4.23E+04 5.96E+04 80 Sb-133 5.52E+07 3.34E+05 2.38E+05 2.99E+05 81 Te-125m 2.17E+05 7.83E+02 1.45E+03 1.95E+03 82 Te-127m 1.15E+06 6.11E+03 5.81E+03 8.21E+03 83 Te-127 8.77E+06 4.80E+04 4.27E+04 6.20E+04 84 Te-129m 4.1OE+06 2.32E+04 1.93E+04 2.68E+04 85 Te-129 2.73E+07 1.54E+05 1.28E+05 1.79E+05 86 Te-131 m 1.27E+07 7.32E+04 5.87E+04 8.04E+04 87 Te-131 8.OOE+07 4.66E+05 3.62E+05 4.85E+05 88 Te-132 1.29E+08 7.54E+05 5.80E+05 7.73E+05 89 Te-133m 7.15E+07 4.34E+05 3.08E+05 3.82E+'05 90 Te-133 1.1OE+08 6.48E+05 4.90E+05 6.43E+05 91 Te-134 1.62E+08 9.81 E+05 6.97E+05 8.70E+05 92 Ba-137m 8.35E+06 3.17E+04 5.45E+04 7.26E+04 93 Ba-139 1.71 E+08 1.02E+06 7.49E+05 9.61 E+05.94 Ba-140 1.65E+08 9.88E+05 7.24E+05 9.30E+05 95 Ba-141 1.55E+08 9.29E+05 6.79E+05 8.67E+05 96 Ba-142 1.48E+08 8.92E+05 6.45E+05 8.17E+05 E1-4 ENCLOSURE 1 Tritium Production Core (Unit 1) Inventory Total Core 1X Burned 2X Burned 3X Burned Nuclide Inventory (Ci) (Ci/Assy) (Ci/Assy) (Ci/Assy)97 La-140 1.69E+08 1.00E+06 7.48E+05 9.78E+05 98 La-141 1.56E+08 9.33E+05 6.83E+05 8.71 E+05 99 La-142 1.52E+08 9.11 E+05 6.61 E+05 8.37E+05 100 La-143 1.46E+08 8.85E+05 6.31 E+05 7.89E+05 101 Ce-141 1.59E+08 9.51 E+05 6.94E+05 8.85E+05 102 Ce-143 1.47E+08 8.90E+05 6.36E+05 7.96E+05 103 Ce-144 1.17E+08 6.1OE+05 6.OOE+05 6.79E+05 104 Ce-145 9.96E+07 6.00E+05 4.32E+05 5.45E+05 105 Pr-143 1.46E+08 8.82E+05 6.30E+05 7.84E+05 106 Pr-144 1.18E+08 6.15E+05 6.04E+05 6.85E+05 107 Pr-145 9.97E+07 6.OOE+05 4.32E+05 5.45E+05 108 Np-239 1.53E+09 8.24E+06 7.61E+06 1.16E+07 109 H-3 2.68E+07 E1-5 ENCLOSURE 2 Standard Core (Unit 2) Inventory Nuclide Ci / Assembly Total Core Inventory (Ci)1 Kr-83m 5.96E+04 1.15E+07 2 Kr-85m 1.24E+05 2.39E+07 3 Kr-85 5.35E+03 1.03E+06 4 Kr-87 2.49E+05 4.81 E+07 5 Kr-88 3.45E+05 6.66E+07 6 Kr-89 4.29E+05 8.28E+07 7 Kr-90 4.59E+05 8.86E+07 8 Xe-131m 5.43E+03 1.05E+06 9 Xe-133m 3.19E+04 6.16E+06 10 Xe-133 9.92E+05 1.91E+08 11 Xe-135m 2.1OE+05 4.05E+07 12 Xe-135 3.33E+05 6.43E+07 13 Xe-137 9.23E+05 1.78E+08 14 Xe-138 8.64E+05 1.67E+08 15 Xe-139 6.41 E+05 1.24E+08 16 Xe-140 4.46E+05 8.61E+07 17 1-130 9.99E+03 .1.93E+06 18 1-131 4.90E+05 9.46E+07 19 1-132 7.18E+05 1.39E+08 20 1-133 1.01 E+06 1.95E+08 21 1-134 1.12E+06 2.26E+08 22 1-135 9.65E+05 1.86E+08 23 1- 136m 2.16E+05 4.17E+07 24 Br-83 5.96E+04 1.15E+07 E2-1 ENCLOSURE 2 Standard Core (Unit 2) Inventory Nuclide Ci / Assembly Total Core Inventory (Ci)25 Br-84m 2.95E+03 5.69E+05 26 Br-84 1.11 E+05 2.14E+07 27 Br-85 1.23E+05 2.37E+07 28 Br-87 1.96E+05 3.78E+07 29 Cs-134 8.61 E+04 1.66E+07 30 Cs-135 O.OOE+00 O.OOE+00 31 Cs-136 3.05E+04 5.89E+06 32 Cs-137 6.04E+04 1.17E+07 33 Cs-138 9.36E+05 1.81E+08 34 Cs-139 8.72E+05 1.68E+08 35 Cs-140 7.83E+05 1.51 E+08 36 Cs-141 5.97E+05 1.15E+08 37 Rb-88 3.54E+05 6.83E+07 38 Rb-89 4.62E+05 8.92E+07 39 Rb-90m 1.34E+05 2.59E+07 40 Rb-90 4.25E+05 8.20E+07 41 Rb-91 5.62E+05 1.08E+08 42 Se-84 1.08E+05 2.08E+07 43 Sr-89 4.84E+05 9.34E+07 44 Sr-90 4.63E+04 8.94E+06 45 Sr-91 6.03E+05 1.16E+08 46 Sr-92 6.41 E+05 1.24E+08 47 Sr-93 7.24E+05 1.40E+08 48 Sr-94 7.22E+05 1.39E+08 E2-2 ENCLOSURE 2 Standard Core (Unit 2) Inventory Nuclide Ci / Assembly Total Core Inventory (Ci)49 Y-90 4.91 E+04 9.48E+06 50 Y-91 M 3.50E+05 6.76E+07 51 Y-91 6.27E+05 1.21 E+08 52 Y-92 6.46E+05 1.25E+08 53 Y-93 4.91 E+05 9.48E+07 54 Y-94 7.80E+05 1.51 E+08 55 Y-95 8.11 E+05 1.57E+08 56 Y-96 7.83E+05 1.51 E+08 57 Zr-95 8.66E+05 1.67E+08 58 Zr-97 8.35E+05 1.61 E+08 59 Nb-95 8.74E+05 1.69E+08 60 Nb-97m 7.92E+05 1.53E+08 61 Nb-97 8.40E+05 1.62E+08 62 Mo-99 9.22E+05 1.78E+08 63 Tc-99m 8.11 E+05 1.57E+08 64 Tc-99 0.OOE+00 0.OOE+00 65 Tc-101 8.36E+05 1.61 E+08 66 Ru-103 7.66E+05 1.48E+08 67 Ru-105 5.20E+05 1.OOE+08 68 Ru-106 2.59E+05 5.OOE+07 69 Ru-107 2.99E+05 5.77E+07 70 Rh-103m 765000 147645000 71 Rh-105m 148000 28564000 72 Rh-105 4.95 E+05 9.55E+07 E2-3 ENCLOSURE 2 Standard Core (Unit 2) Inventory Nuclide Ci / Assembly Total Core Inventory (Ci)73 Rh-106 2.76E+05 5.33E+07 74 Rh-107 2.99E+05 5.77E+07 75 Sn-130 1.65E+05 3.18E+07 76 Sb-127 4.17E+04 8.05E+06 77 Sb-129 1.57E+05 3.03E+07 78 Sb- 130m 221000 42653000 79 Sb-130 5.20E+04 1.00E+07 80 Sb-133 3.20E+05 6.18E+07 81 Te-125m 1.00E+02 1.93E+04 82 Te-127m 6.87E+03 1.33E+06 83 Te-127 4.11E+04 7.93E+06 84 Te-129m 3.01E+04 5.81E+06 85 Te-129 1.49E+05 2.88E+07 86 Te-131m 9.62E+04 1.86E+07 87 Te-131 4.14E+05 7.99E+07 88 Te-132 7.05E+05 1.36E+08 89 Te-133m 4.52E+05 8.72E+07 90 Te-133 5.49E+05 1.06E+08 91 Te-134 8.95E+05 1.73E+08 92 Ba- 137m 5.40E+04 1.11 E+07 93 Ba- 139 8.94E+05 1.73E+08 94 Ba- 140 8.98E+05 1.73E+08 95 Ba-141 8.1OE+05 1.56E+08 96 Ba-142 7.71 E+05 1.49E+08 E2-4 ENCLOSURE 2 Standard Core (Unit 2) Inventory Nuclide Ci / Assembly Total Core Inventory (Ci)97 La-140 9.29E+05 1.79E+08 98 La-141 8.17E+05 1.58E+08 99 La-142 7.99E+05 1.54E+08 100 La-143 7.59E+05 1.46E+08 101 Ce-141 8.25E+05 1.59E+08 102 Ce-143 7.65E+05 1.48E+08 103 Ce-144 6.69E+05 1.29E+08 104 Ce-145 5.20E+05 1.OOE+08 105 Pr-143 7.46E+05 1.44E+08 106 Pr-144 6.73E+05 1.30E+08 107 Pr-145 5.21 E+05 1.01 E+08 108 Np-239 9.69E+06 1.87E+09 E2-5