ML20059G003
| ML20059G003 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 10/29/1993 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20059F995 | List: |
| References | |
| NUDOCS 9311050211 | |
| Download: ML20059G003 (6) | |
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QUAD-CITIES NUCLEAR POWER STATION l
l UNIT 2 CYCLE 13 t
STARTUP TEST RESULTS SUPPLEMENT ONE P
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TABLE OF CONTENTS l
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.!r Test No Title Page i
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4 TIP Reproducibility and l
Core Power Symmetry 3
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4.
Core Power Distribution Symmetrv Analysis l
Purcose I
The purpose of this test was to determine the magnitude of indicated l
core power distribution asymmetries using data (TIP traces and OD-1) collected in conjunction with the CMC update.
Criteria l
A.
The total TIP uncertainty (including random noise and geometric uncertainties obtained by averaging the uncertainties for:all data ~
sets) must be less than 9%.
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B.
The gross check of TIP signal symmetry should yield a maximum deviation between symmetrically located pairs of less than 25%.
Results and Discussion j
Core power symmetry calculations were carried out based upon computer program OD-1 data run on August 19. 1993 and again on October 9. 1993.
The average total TIP uncertainty from the two symmetry calculations was 2.985%.
The random noise uncertainty was 1.427%. This yields a geometrical uncertainty of 2.621%. The total TIP uncertainty was well within the 9% limit.
The above results were performed without using LPRM strings 5 and 33.
String 5 is a Hydrogen Water Chemistry (HWC) probe in which the "D" level LPRM detector has been replaced by HWC detectors. A safety evaluation (93-27) was performed for this change and no unreviewed i
safety questions were indicated.
The effect on the 0D-79 program will i
3 be that 1 symmetric pair of LPRMs will be unavailable for the core symmetry calculation, namely pairs 48-09 and 08-49 (strings 5 and 33.
l respectively). These are peripheral strings and will have the effect of -
i decreasing the core symmetry calculation' total uncertainty.
This effect occurs because the power magnitude on the periphery is smaller than the a
power magnitude in the center of the core. Thus. a' differential change hetween the peripheral pair power levels will result in a greater percent uncertainty than a differential change in the power level of center core symmetric pairs.
Data was taken in order to support this l
from a Unit 2 tip set done in December 1992 with only 39 strings run.
With no other failures present, the core symmetry calculation will meet i
its acceptability requirements.
Table 1 lists the symmetrical TIP pairs and their respective deviations.
Figure 2 shows the core location of the TIP pairs and their TIP readings.
The maximum deviation between symmetrically located TIP pairs
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occurred during the October 9.1993 run and was 9.611% for pair 9-20.
This is well within the 25% limit.
1 STMGR 01293 GGC 3
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i 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 = 18n j=1 i=5 where Rij is the ratio for the ith node $f TIP pair j. there being n j
such pairs, where n=18.
Ncxt the standard deviation of the ratios is calculated by:
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(Rij - li)2 1/2 o=
i=1 i=5 j
R (18n - 1) o, is multiplied by 100 to express o as a percentage of the ideal value i
n of op of 1.0.
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% a, - o, x 100 The total TIP uncertainty is calculated by dividing % o by V 2 in order n
to account for data being taken at 3 inch intervals and analyzed on a 6 l
inch nodal basis.
In orde-to calculate random noise uncertainty the average reading at' i
each node for nodes 5 through 22 is calculated by:
1 MT NT I
I BASE (N. M. K) l BASE (K) - NT x MT M=1 N=1 where NT = number of runs per machine = 5 MT = number of machines - 5 BASE (K) = average reading at nodal level K.
j K = 5 through 22 1
i The random noise is derived from the average of the nodal variances by:
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1/2 I
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BASE (N. M. K) - BASE (K)
% o noise -
K=5 M=1 N=1 BASE (K) x 100 18 (NT x MT -1) 1 Finally the TIP geometric uncertainty can be calculated by:
% a geometric = (% o total - % o noise?) 1/2 2
STMGRiO!293.GGC 4
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I Table 1 l
CORE SYMMETRY i
Based on OD-1 From i
The Avera9e Between the 8-19-93 Case ci and the 10-9-93 Case SYMMETRICAL TIP AVERAGE-PAIR NUMBERS ABSOLUTE DIFFERENCE
% DEVIATION i
a-b f=
T-T
% = 100 X T/((T, + T )/2)-
3 3
1-6 1.9$
2.12 2-12 7.16 5.71 l
3-19
' 57 1.20-4-26 0.86 0.66
- 5-33 8-13 2.11 1.59 9-20 9.46 7.61 10-27 0.68 0.50 1
11-34 5.81 4.26 i
15-21 3.14 2.66 16-28 2.22 1.95 17-35 6.18 4.54 l
18-39 4.60 5.27 23-29 0.30 0.24 2
24-36 0.54 0.42 25-40 1.24 1.21 31-37 1.91 1.43 32-41 1.40 2.28
'i 22 Average Deviation - 3.0029 T = I T,(K) /18 3
i=5 l
Not used due to Hydrogen Water Chemistry Probe in-core location 48-09 (string 5).
The "D" level detector does not exist, so the TIP could not be run in index.
Thus OD-79 core symmetry could not be calculated.
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