ML20080P474
| ML20080P474 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 02/23/1995 |
| From: | Pearce L COMMONWEALTH EDISON CO. |
| To: | Murley T Office of Nuclear Reactor Regulation |
| References | |
| LWP-95-015, LWP-95-15, NUDOCS 9503080002 | |
| Download: ML20080P474 (7) | |
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N Commonwealth EdisonL
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't Quad Cities Nuctar Power Station C
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g Cordova, minois 61242 9740
. Telephone 309/654 2241
.LWP-95-015
' February 23,'1995, Dr. " Thomas Murley,-Director i
10ffice of Nuclear: Reactor Regulation -
U.S. Nuclear Regulatory Commission.
. Washington, D.C-20555 Attn:
Document' Control. Desk.
Lubject:
Quad Cities Nuclear Power Station Unit.One S
~
p Startup Test: Report Summary NRC Docket No. 50-254
Dear Dr. Murley:
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Enclosed for your information.and 'use ;is the Quad Cities. Station Unit. One. Cycle - 14 Startup' Test Report Summary (Supplement).. This report is submitted in accordance with
. Technical Specification DPR-29, Section 6.6.A.I.
' Quad Cities Unit';0ne Cycle 14 began commercial Loperation on~ August 28i 1994 following
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a : refueling outage.
The Unit'One Cycle 14' core. loading consists of 144 fresh ? fuel bundles. (8x8 GE10 fuel) Land 580 reload bundles.
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.. All: test data taken to 'date -has been reviewed in accordance with applicable station procedures.
Exceptions ~ from 'any criteria' were evaluated to ' verify ' compliance l with Technical Specification limits _ to ensure the acceptability of subsequent test results.
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^ Attached is the evaluation of th i following'. test:
TIP Reproducability a'nd Corn Power.
Please contact the. Nuclear Engineering Group if there are.any questions.
1-l Sin re 8624/4 L. W.
Pearce Station Manager
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LWP/FA/kjv LAttachment.
cc:
J. Martin, Regional Administrator-RIII C. Miller, Resident Inspector-Quad Cities
'/
R. Pulsifer, Project Manager-NRR
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Office of' Nuclear Safety-IDNS:
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9503080002 950223 STMORW1595.LWP '
PDR ADOCK 05000254 p
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UNIT ONE CYCLE FOURTEEN I
STARTUP TEST RESULTS
SUMMARY
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Core Power Distribution Symmetry Analysis Purpose-The purpose of this test was to determine the magnitude of indicated core' power distribution asymmetries using data (TIP traces and OD-1) collected in conjunction with the CMC update.
Criteria The total TIP uncertainty (including random noise and geometric uncertainties obtained '
A.
by averaging the uncertain *'as for all data sets) must ba less than 9%.
The gross check of TIP signal symmetry should yield a maximum deviation between B.
symmetrically located pairs of less than 25%.
Results and Discussion Core power symmetry calculations were carried out based upon process computer OD-1 data run on February 8,1995, and February 11,1995. The average total TIP uncertainty from the three symmetry calculations was 7.002%. The random noise uncertainty was 5.461%. This yields a geometrical uncertainty of 4.382%. The total TIP uncertainty was within the 9% Ilmit.
Table 1 lists the symmetricalTIP pairs and their respective deviations. Figure 1 shows the core.
location of the TIP pairs and the averaged TIP readings. The maximum deviation between symmetrically located TIP pairs occurred during the February 11,1995 run and was 24.899%
for pair 11-34. This deviation is within the 25% limit.
Although criteria A and B are met by the TIP data, the total uncertainty and maximum deviation between symmetric pairs is larger than previous cycles. Data from TIP #5 shows a lack of reproducability, which would lead to the larger uncertainty and asymmetry values seen. The performance of TIP #5 is being investigated.
The method used to obtain the uncertainties consisted of calculating the average of the nodal ratio of TIP pairs by:
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Rij R - I5n j-1 1-5 where Rij is the ratio for the ith node of TIP pair j, there being n such pairs, where n = 18.
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Next the standard deviation of the ratios is calculated by:
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.1-1 i (18n - 1) a is multiplied by 100 to express a as a percentage of the n
n Ideal value of a of 1.0.
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% a = a x 100 n
n The total TIP uncertainty is calculated by dividing % a byV2 in order to account for data being 4
n taken at 3 inch intervals and analyzed on a 6 inch nodal basis, in order to calculate random noise uncertainty the average reading at each node for nodes 5 :
through 22 is calculated by:
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BASE (N, M,' K)
EX5E(K)-
NT.~x Mr M-1 N-1 where NT = number of runs per machine = 5
__ MT = number of machines = 5 BASE (K) = average reading at nodallevel K, K = 5 through 22 The random noise is derived from the average of the nodal variances by:
1/2
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BASE (N. M. K) - E%5Y (K)'ll l 22 MT NT I
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% 0 noise -
K-5 M-1 N-1 BASE (K)
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Finally the TIP geometric uncertainty can be calculated by:
% a geometric = (% a total
% a noise ) us 2
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TECil5STUPTEST 2
Tab! 1 CORE SYMMETRY Based on OD-1 From 2-8-95 (99% power)
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AVERAGE j
SYMMETRICAL TIP PAIR NUM8ERS ABSOLUTE DIFFERENCE
% DEVIATION a-b T = T, - T.
% = 100 X T/((T + T.)/2) 1-6 0.290 0.450 2-12 3.911 3.553 3-19 6.304 5.643 i
4-26 1.141 1.360.
l 5-33 2.316 7.318
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8-13 4.925 3.955 9-20 6.342 5.312 10-27 10.580 9.229 4
11-34 17.571 18.679 15-21 4.128 3.903 16-28 14.911 12.147 17-35 0.853 0.788 18-39 3.532 5.901 23 29 8.038 7.131 24-36 2.727 2.135 25-40 11.828 18.033 31-37 11.676 12.020 32-41 0.832 2.160' 22 Average Deviation = 6.217 T = I T(K) /18 i
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CORE SYMMETRY Based on OD-1 From 021195 (99% power)
AVERAGE SYMMETRICAL TIP PAIR NUMBERS ABSOLUTE DIFFERENCE
% DEVIATION a-b T = T, - T.
% = 100 X T/((T. + T )/2) 1-6 0.448 0.701 2-12 3.780 3.455 3-19 5.918 5.324 4-26 1.451 1.740 5-33 2.395 7.591 8 13 5.200 4.198 9-20 6.731 5.651 10-27 10.825 9.460 11-34 22.790 24.899 15-21 4.978 4.693 16-28 14.321 11.638 17-35 14.029 13.706 18-39 3.757 6.314 23-29 7.352 6.540 24 36 2.863 2.244 25-40 14.877 23.435 31-37 12.704 13.226 32-41 7.019 19.942 22 Average Deviation = 7.857 T,= I T,(K) /18 l
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