ML20059G003

Revised Quad-Cities Nuclear Power Station Unit 2 Cycle 13 Startup Test Results

ML20059G003
Person / Time
Site:	Quad Cities
Issue date:	10/29/1993
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20059F995	List: ML20059F992 ML20059G003
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 i

.!r Test No Title Page i

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4 TIP Reproducibility and Core Power Symmetry l 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%. l I

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 l 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String 5 is a Hydrogen Water Chemistry (HWC) probe in which the "D" level LPRM detector has been replaced by HWC detectors.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 3

safety questions were indicated. The effect on the 0D-79 program will i 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. l Figure 2 shows the core location of the TIP pairs and their TIP l readings. The maximum deviation between symmetrically located TIP pairs )

occurred during the October 9.1993 run and was 9.611% for pair 9-20.

This is well within the 25% limit.

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. The method used to obtain the uncertainties consisted of calculating the

. average of the nodal ratio of TIP pairs by: I n 22 1 I I 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: j n 22 i I I (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 n i of op of 1.0. l

% a, - o, x 100 The total TIP uncertainty is calculated by dividing % on by V 2 in order '

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 l 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:

22 MT NT f 1/2 I I I BASE (N. M. K) - BASE (K)

% o noise - K=5 M=1 N=1 BASE (K) x 100 18 (NT x MT -1) l

.- 1 Finally the TIP geometric uncertainty can be calculated by:

% a geometric = (% o total2- % o noise?) 1/2 STMGRiO!293.GGC 4 l

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. 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 3  % = 100 X T/((T, + T3 )/2)- ,

1-6 1.9$ 2.12 2-12 7.16 5.71 l 3-19 ' 57

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4-26 0.86 0.66  :

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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 18-39 6.18 4.60 4.54 5.27 l '

. 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  :

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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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CYCLE 13 QUAD uluss UNIT 2 REACTOR POWER SYMMETRY  !

AVERAGE BASE READINGS  !

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(NWC) test (Te m Alt 92-2-126). The an= levet detector in string 5 was replaced by HWC protes.

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