ML16062A375
| ML16062A375 | |
| Person / Time | |
|---|---|
| Site: | Rhode Island Atomic Energy Commission |
| Issue date: | 03/01/2016 |
| From: | Marlone Davis State of RI, Atomic Energy Comm |
| To: | Patrick Boyle Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML16062A372 | List: |
| References | |
| Download: ML16062A375 (12) | |
Text
Core Change Summary for Conversion from RINSC LEU Core #5 to LEU Core # 6 Core History The original reactor core at RINSC was fueled with HEU fuel. In August of 1993, RINSC converted its core from HEU to LEU fuel. The final total number of operating hours with HEU fuel was:
49698.01 MWH of HEU fuel operation Cores LEU #1 through LEU #3 did not involve changing the grid positions or replacing any of the fuel elements. These configuration changes were made by changing the neutron reflection around the core to make it progressively more efficient as fuel burn-up took effect. On 24 October 2008, RINSC changed the core configuration to core LEU
- 4. This change involved retiring four fuel elements from the center of the core, moving all of the remaining fuel elements toward the center of the core, and adding four fresh fuel elements to the outer corners of the fueled section of the core. During an element inspection, it was discovered that the positions of fuel elements RI - 002 and RI - 010 had been transposed. Rather than returning the transposed fuel elements to their core #4 positions, a new core #5 was defined with the elements remaining in the transposed positions. Consequently, LEU Core #5 was defined to be:
Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 15 Fuel - 9 Fuel - 16 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 13 Fuel - 1 Fuel - 11 B-2 G - 14 5 G - 10 B-8 Fuel - 8 CIF Fuel - 7 B - 14 G-6 6 G - 12 B - 12 Fuel - 12 Fuel - 10 Fuel - 14 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 17 Fuel - 2 Fuel - 18 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 1
It was determined that the initial date that the core was in this configuration was 6 May 2009. The final operating day for core LEU #5 was 17 August 2012, which was run
- 8721. The total number of MWH of operation for Core LEU #5 was 2300.4 MWH.
The following table shows a summary of the LEU core history:
Core Begin End Date Final Run MWH of Total Facility Date Number Operation LEU Lifetime MWH MWH HEU 7/26/64 8/13/93 49698.01 0 49698.01 LEU #1 8/20/93 5/26/94 1381.75 1381.75 51079.76 LEU #2 5/27/94 9/8/94 501.66 1883.41 51581.42 LEU #1A 9/9/94 9/4/97 3662.75 5546.16 55244.17 LEU #2 9/5/97 5/1/03 3203.34 8749.50 58447.51 LEU #3 5/2/03 10/23/08 8270 3486.76 12236.26 61934.27 LEU #4 10/24/08 5/5/09 8348 401.10 12637.36 62335.37 LEU #5 5/6/08 8/17/12 8721 1899.30 14536.66 64234.67 Final LEU Core #5 Elemental Burn-Up Element InitialU Initial TotalElem ent U 235 U 235 TotalU U 235 Elem entM W H C onsum ed R em aining R em aining R I-001 1,389.85 274.71 1,118.00 58.23 216.48 1,340.94 R I-002 1,389.76 274.71 1,044.26 54.39 220.32 1,344.07 R I-007 1,389.33 274.60 1,067.37 55.59 219.01 1,342.63 R I-008 1,389.81 274.70 1,067.37 55.59 219.11 1,343.11 R I-009 1,389.64 274.66 808.02 42.08 232.58 1,354.29 R I-010 1,388.59 274.55 881.76 45.93 228.62 1,350.01 R I-011 1,388.48 274.63 948.81 49.42 225.21 1,346.97 R I-012 1,388.71 274.67 948.81 49.42 225.25 1,347.20 R I-013 1,388.51 274.63 826.45 43.04 231.59 1,352.36 R I-014 1,389.01 274.73 826.45 43.04 231.69 1,352.86 R I-015 1,388.69 274.67 124.25 6.47 268.20 1,383.26 R I-016 1,388.59 274.65 124.25 6.47 268.18 1,383.16 R I-017 1,388.68 274.67 124.25 6.47 268.20 1,383.25 R I-018 1,388.59 274.65 124.25 6.47 268.18 1,383.16 Transition from Core LEU #5 to Core LEU #6 On 20 August 2012, Fuel elements RI - 001, RI - 007, RI - 008, and RI - 010 were retired and put into storage. At this point the core configuration was:
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LEU Core #6 Step 1 Configuration - 20 August 2012 Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 15 Fuel - 9 Fuel - 16 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 13 Fuel - 11 B-2 G - 14 5 G - 10 B-8 CIF B - 14 G-6 6 G - 12 B - 12 Fuel - 12 Fuel - 14 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 17 Fuel - 2 Fuel - 18 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 Fuel elements RI - 011, RI - 012, RI - 013, and RI - 014 were shifted counter clockwise around the center of the core. At this point the core configuration was:
LEU Core #6 Step 2 Configuration - 20 August 2012 Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 15 Fuel - 9 Fuel - 16 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 11 B-2 G - 14 5 G - 10 B-8 Fuel - 13 CIF Fuel - 14 B - 14 G-6 6 G - 12 B - 12 Fuel - 12 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 17 Fuel - 2 Fuel - 18 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 3
Fuel elements RI - 002, RI - 009, RI - 015, and RI - 018 were moved to the following grid locations:
RI - 002 Grid C6 RI - 009 Grid E4 RI - 015 Grid C4 RI - 018 Grid E6 At this point the core configuration was:
LEU Core #6 Step 3 Configuration - 20 August 2012 Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 16 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 15 Fuel - 11 Fuel - 9 B-2 G - 14 5 G - 10 B-8 Fuel - 13 CIF Fuel - 14 B - 14 G-6 6 G - 12 B - 12 Fuel - 2 Fuel - 12 Fuel - 18 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 17 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 On 21 August 2012, Fuel elements RI - 016 and RI - 017 were shifted counter clockwise around the center of the core. At this point the core configuration was:
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LEU Core #6 Step 4 Configuration - 21 August 2012 Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 16 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 15 Fuel - 11 Fuel - 9 B-2 G - 14 5 G - 10 B-8 Fuel - 13 CIF Fuel - 14 B - 14 G-6 6 G - 12 B - 12 Fuel - 2 Fuel - 12 Fuel - 18 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 17 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 On 22 August 2012, Fuel elements RI - 019, RI - 020, and RI - 021 were installed in the corners of the core. At this point the core configuration was:
LEU Core #6 Step 5 Configuration - 22 August 2012 Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 19 Fuel - 16 Fuel - 20 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 15 Fuel - 11 Fuel - 9 B-2 G - 14 5 G - 10 B-8 Fuel - 13 CIF Fuel - 14 B - 14 G-6 6 G - 12 B - 12 Fuel - 2 Fuel - 12 Fuel - 18 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 21 Fuel - 17 Fuel - 22 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 This is the configuration for Core LEU #6.
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Initial LEU Core #6 Critical Rod Heights On 23 August 2012 an approach to critical was performed. Critical rod heights were determined to be:
Shim Safety #1 16.00 inches Shim Safety #2 16.00 inches Shim Safety #3 16.00 inches Shim Safety #4 16.00 inches Regulating Rod 10.66 inches Initial LEU Core #6 Control Rod Worths On 24 August 2012 and 27 August 2012 the control rods were calibrated. The control rod worths were determined to be:
Shim Safety #1 3.97 % dk/k Shim Safety #2 1.64 % dk/k Shim Safety #3 1.58 % dk/k Shim Safety #4 2.25 % dk/k Regulating Rod 0.32 % dk/k RINSC Technical Specification 3.1.6 requires that the reactivity worth of the regulating rod be less than 0.6 % dk/k. The control rod calibration showed that this was the case.
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Blade 1 Int 8-26-2012, 3.97%
0.05 0.04 0.04 0.03
% Delta-K/K 0.03 0.02 0.02 0.01 0.01 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Inches Withdrawn 7
Blade 2 Int 8-26-2012, 1.64%
0.02 0.02 0.01 0.01
% Delta-K/K 0.01 0.01 0.01 0.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Inches Withdrawn 8
Blade 3 Int 8-26-2012, 1.58%
0.02 0.02 0.01 0.01
% Delta-K/K 0.01 0.01 0.01 0.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Inches Withdrawn 9
Blade 4 Int 8-26-2012, 2.25%
0.03 0.02 0.02
% Delta-K/K 0.01 0.01 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Inches Withdrawn 10
Regulating Blade 8-27-2012 0.315%
0.00 0.00 0.00 0.00
%Delta-K/K 0.00 0.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 Inches Withdrawn 11
Initial LEU Core #6 Excess and Shutdown Margin Reactivity 2012 Excess Reactivity and Shutdown Margin Total Worth Total Length Critical Heights Critical Worth SS#1 3.97% 26.63 16 2.76%
SS#2 1.64% 26.92 16 1.12%
SS#3 1.58% 26.69 16 1.10%
SS#4 2.25% 26.67 16 1.56%
RR 0.32% 20.27 10.66 0.17%
Total 9.76% Total 6.71%
XS Reactivity 3.05% TS 3.1.2 Requires XS Reactivity <= 4.7%
dk/k
- Total Critical Worth -6.71%
+ Regulating Rod Worth 0.32% Log Book 58
+ Most Reactive SS Worth 3.97% Page 123 SD Margin -2.42% TS 3.1.1 Requires that SD Margin <= -1%
dk/k RINSC Technical Specification 3.1.1 requires that the shutdown margin be at least 1.0 %
dk/k with the highest worth shim safety rod and the regulating rod fully withdrawn. The control rod calibration showed that this was the case.
RINSC Technical Specification 3.1.2 requires that the core excess reactivity not exceed 4.7 % dk/k. The control rod calibration showed that this was the case.
Initial reactivity Insertion Rates Rod Total Rod Total Withdrawal Total Reactivity % Reactivity Length Time (seconds) Worth (% dk/k) Insertion / second Regulating Rod 20.30 57 0.32% 0.0001 Shim Safety #1 26.00 435 3.97% 0.0001 Shim Safety #2 26.00 435 1.64% 0.0000 Shim Safety #3 26.00 435 1.58% 0.0000 Shim Safety #4 26.00 435 2.25% 0.0001 RINSC Technical Specification 3.2.4 requires that the reactivity insertion rates of the individual control and regulating rods not exceed 0.02 %dk/k per second. The reactivity insertion rate analysis shows that this was the case.
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Core Change Summary for Conversion from RINSC LEU Core #5 to LEU Core # 6 Core History The original reactor core at RINSC was fueled with HEU fuel. In August of 1993, RINSC converted its core from HEU to LEU fuel. The final total number of operating hours with HEU fuel was:
49698.01 MWH of HEU fuel operation Cores LEU #1 through LEU #3 did not involve changing the grid positions or replacing any of the fuel elements. These configuration changes were made by changing the neutron reflection around the core to make it progressively more efficient as fuel burn-up took effect. On 24 October 2008, RINSC changed the core configuration to core LEU
- 4. This change involved retiring four fuel elements from the center of the core, moving all of the remaining fuel elements toward the center of the core, and adding four fresh fuel elements to the outer corners of the fueled section of the core. During an element inspection, it was discovered that the positions of fuel elements RI - 002 and RI - 010 had been transposed. Rather than returning the transposed fuel elements to their core #4 positions, a new core #5 was defined with the elements remaining in the transposed positions. Consequently, LEU Core #5 was defined to be:
Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 15 Fuel - 9 Fuel - 16 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 13 Fuel - 1 Fuel - 11 B-2 G - 14 5 G - 10 B-8 Fuel - 8 CIF Fuel - 7 B - 14 G-6 6 G - 12 B - 12 Fuel - 12 Fuel - 10 Fuel - 14 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 17 Fuel - 2 Fuel - 18 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 1
It was determined that the initial date that the core was in this configuration was 6 May 2009. The final operating day for core LEU #5 was 17 August 2012, which was run
- 8721. The total number of MWH of operation for Core LEU #5 was 2300.4 MWH.
The following table shows a summary of the LEU core history:
Core Begin End Date Final Run MWH of Total Facility Date Number Operation LEU Lifetime MWH MWH HEU 7/26/64 8/13/93 49698.01 0 49698.01 LEU #1 8/20/93 5/26/94 1381.75 1381.75 51079.76 LEU #2 5/27/94 9/8/94 501.66 1883.41 51581.42 LEU #1A 9/9/94 9/4/97 3662.75 5546.16 55244.17 LEU #2 9/5/97 5/1/03 3203.34 8749.50 58447.51 LEU #3 5/2/03 10/23/08 8270 3486.76 12236.26 61934.27 LEU #4 10/24/08 5/5/09 8348 401.10 12637.36 62335.37 LEU #5 5/6/08 8/17/12 8721 1899.30 14536.66 64234.67 Final LEU Core #5 Elemental Burn-Up Element InitialU Initial TotalElem ent U 235 U 235 TotalU U 235 Elem entM W H C onsum ed R em aining R em aining R I-001 1,389.85 274.71 1,118.00 58.23 216.48 1,340.94 R I-002 1,389.76 274.71 1,044.26 54.39 220.32 1,344.07 R I-007 1,389.33 274.60 1,067.37 55.59 219.01 1,342.63 R I-008 1,389.81 274.70 1,067.37 55.59 219.11 1,343.11 R I-009 1,389.64 274.66 808.02 42.08 232.58 1,354.29 R I-010 1,388.59 274.55 881.76 45.93 228.62 1,350.01 R I-011 1,388.48 274.63 948.81 49.42 225.21 1,346.97 R I-012 1,388.71 274.67 948.81 49.42 225.25 1,347.20 R I-013 1,388.51 274.63 826.45 43.04 231.59 1,352.36 R I-014 1,389.01 274.73 826.45 43.04 231.69 1,352.86 R I-015 1,388.69 274.67 124.25 6.47 268.20 1,383.26 R I-016 1,388.59 274.65 124.25 6.47 268.18 1,383.16 R I-017 1,388.68 274.67 124.25 6.47 268.20 1,383.25 R I-018 1,388.59 274.65 124.25 6.47 268.18 1,383.16 Transition from Core LEU #5 to Core LEU #6 On 20 August 2012, Fuel elements RI - 001, RI - 007, RI - 008, and RI - 010 were retired and put into storage. At this point the core configuration was:
2
LEU Core #6 Step 1 Configuration - 20 August 2012 Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 15 Fuel - 9 Fuel - 16 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 13 Fuel - 11 B-2 G - 14 5 G - 10 B-8 CIF B - 14 G-6 6 G - 12 B - 12 Fuel - 12 Fuel - 14 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 17 Fuel - 2 Fuel - 18 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 Fuel elements RI - 011, RI - 012, RI - 013, and RI - 014 were shifted counter clockwise around the center of the core. At this point the core configuration was:
LEU Core #6 Step 2 Configuration - 20 August 2012 Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 15 Fuel - 9 Fuel - 16 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 11 B-2 G - 14 5 G - 10 B-8 Fuel - 13 CIF Fuel - 14 B - 14 G-6 6 G - 12 B - 12 Fuel - 12 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 17 Fuel - 2 Fuel - 18 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 3
Fuel elements RI - 002, RI - 009, RI - 015, and RI - 018 were moved to the following grid locations:
RI - 002 Grid C6 RI - 009 Grid E4 RI - 015 Grid C4 RI - 018 Grid E6 At this point the core configuration was:
LEU Core #6 Step 3 Configuration - 20 August 2012 Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 16 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 15 Fuel - 11 Fuel - 9 B-2 G - 14 5 G - 10 B-8 Fuel - 13 CIF Fuel - 14 B - 14 G-6 6 G - 12 B - 12 Fuel - 2 Fuel - 12 Fuel - 18 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 17 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 On 21 August 2012, Fuel elements RI - 016 and RI - 017 were shifted counter clockwise around the center of the core. At this point the core configuration was:
4
LEU Core #6 Step 4 Configuration - 21 August 2012 Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 16 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 15 Fuel - 11 Fuel - 9 B-2 G - 14 5 G - 10 B-8 Fuel - 13 CIF Fuel - 14 B - 14 G-6 6 G - 12 B - 12 Fuel - 2 Fuel - 12 Fuel - 18 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 17 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 On 22 August 2012, Fuel elements RI - 019, RI - 020, and RI - 021 were installed in the corners of the core. At this point the core configuration was:
LEU Core #6 Step 5 Configuration - 22 August 2012 Thermal Column Side A B C D E F G 1 CIC #1 G - 20 G - 17 G - 24 G - 13 G - 23 2 G - 15 G - 18 B - 10 Reg Rod B-1 G - 21 G - 16 3 G-4 B-5 Fuel - 19 Fuel - 16 Fuel - 20 B - 15 G-3 2 3 4 G-2 B-7 Fuel - 15 Fuel - 11 Fuel - 9 B-2 G - 14 5 G - 10 B-8 Fuel - 13 CIF Fuel - 14 B - 14 G-6 6 G - 12 B - 12 Fuel - 2 Fuel - 12 Fuel - 18 B-6 G - 11 1 4 7 G-9 B-9 Fuel - 21 Fuel - 17 Fuel - 22 B - 16 G-5 8 G - 19 G-7 B - 13 B - 11 B-4 G-8 G-1 9 FC CIC #2 This is the configuration for Core LEU #6.
5
Initial LEU Core #6 Critical Rod Heights On 23 August 2012 an approach to critical was performed. Critical rod heights were determined to be:
Shim Safety #1 16.00 inches Shim Safety #2 16.00 inches Shim Safety #3 16.00 inches Shim Safety #4 16.00 inches Regulating Rod 10.66 inches Initial LEU Core #6 Control Rod Worths On 24 August 2012 and 27 August 2012 the control rods were calibrated. The control rod worths were determined to be:
Shim Safety #1 3.97 % dk/k Shim Safety #2 1.64 % dk/k Shim Safety #3 1.58 % dk/k Shim Safety #4 2.25 % dk/k Regulating Rod 0.32 % dk/k RINSC Technical Specification 3.1.6 requires that the reactivity worth of the regulating rod be less than 0.6 % dk/k. The control rod calibration showed that this was the case.
6
Blade 1 Int 8-26-2012, 3.97%
0.05 0.04 0.04 0.03
% Delta-K/K 0.03 0.02 0.02 0.01 0.01 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Inches Withdrawn 7
Blade 2 Int 8-26-2012, 1.64%
0.02 0.02 0.01 0.01
% Delta-K/K 0.01 0.01 0.01 0.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Inches Withdrawn 8
Blade 3 Int 8-26-2012, 1.58%
0.02 0.02 0.01 0.01
% Delta-K/K 0.01 0.01 0.01 0.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Inches Withdrawn 9
Blade 4 Int 8-26-2012, 2.25%
0.03 0.02 0.02
% Delta-K/K 0.01 0.01 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Inches Withdrawn 10
Regulating Blade 8-27-2012 0.315%
0.00 0.00 0.00 0.00
%Delta-K/K 0.00 0.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 Inches Withdrawn 11
Initial LEU Core #6 Excess and Shutdown Margin Reactivity 2012 Excess Reactivity and Shutdown Margin Total Worth Total Length Critical Heights Critical Worth SS#1 3.97% 26.63 16 2.76%
SS#2 1.64% 26.92 16 1.12%
SS#3 1.58% 26.69 16 1.10%
SS#4 2.25% 26.67 16 1.56%
RR 0.32% 20.27 10.66 0.17%
Total 9.76% Total 6.71%
XS Reactivity 3.05% TS 3.1.2 Requires XS Reactivity <= 4.7%
dk/k
- Total Critical Worth -6.71%
+ Regulating Rod Worth 0.32% Log Book 58
+ Most Reactive SS Worth 3.97% Page 123 SD Margin -2.42% TS 3.1.1 Requires that SD Margin <= -1%
dk/k RINSC Technical Specification 3.1.1 requires that the shutdown margin be at least 1.0 %
dk/k with the highest worth shim safety rod and the regulating rod fully withdrawn. The control rod calibration showed that this was the case.
RINSC Technical Specification 3.1.2 requires that the core excess reactivity not exceed 4.7 % dk/k. The control rod calibration showed that this was the case.
Initial reactivity Insertion Rates Rod Total Rod Total Withdrawal Total Reactivity % Reactivity Length Time (seconds) Worth (% dk/k) Insertion / second Regulating Rod 20.30 57 0.32% 0.0001 Shim Safety #1 26.00 435 3.97% 0.0001 Shim Safety #2 26.00 435 1.64% 0.0000 Shim Safety #3 26.00 435 1.58% 0.0000 Shim Safety #4 26.00 435 2.25% 0.0001 RINSC Technical Specification 3.2.4 requires that the reactivity insertion rates of the individual control and regulating rods not exceed 0.02 %dk/k per second. The reactivity insertion rate analysis shows that this was the case.
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