ML20141G636
| ML20141G636 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 05/15/1997 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20141G617 | List: |
| References | |
| NUDOCS 9705220437 | |
| Download: ML20141G636 (23) | |
Text
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Attachment A Westinghouse Report :
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Interim Plugging Criteria Return to Power . Report ;
May 1997 l
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7 Braidwood Unit 1 ,
Interim Plugging Criteria Return to Power Report May 1997 l
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Table of Catents l
1
- 1.0 Introduction 2.0 Summary and Conclusions 3.0 EOC 6 Inspection Results and Voltage Growth Rates 3.1 EOC 6 Inspection Results 3.2 Voltage Growth Rates 3.3 NDE Uncertainties 4.0 Database Applied for IPC Correlations 5.0 SLB Analysis Methods 6.0 SLB Leak Rate and Tube Burst Probability for EOC-6 7.0 References e
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Braidwood Unit 1 Intedm Plugging Cdtena Return to Power Report 1.0 Introduction This report provides the Braidwood Unit 1 steam generator tube Eddy Current (EC) l inspection results at the end of' Cycle 6 together with Steam Line Break (SLB) leak !
rate and tube burst probability analysis results calculated using the measured voltage data, in support of the implementation of the 3.0 volt Interim Plugging Criteria (IPC).
SLB leak rates and tube burst probabilities were calculated assuming that indications at the tube support plate (TSP) intersections are restrained from bursting under SLB conditions due to TSP locking by tube expansion. Leak rate and probability of burst values calculated with the actual measured voltage distributions are compared with the corresponding projections performed at the beginning 6f cycle 6 (BOC.6) using the last two inspections data. The methodology used in these evaluations is in accordance with the Braidwood Unit-1 SER and previously published Westinghouse !
methodology report (Reference 1). Projections of end of cycle (EOC) voltage i distributions, leak rates and burst probabilities based on the 3.0 volt repair criteria for the upcoming Cycle 7 operation will be presented in the 90 day report.
1 2.0 Sununary and Condusions SLB leak rate and tube burst probability analyses were performed for all four steam generators (SGs) based on their actual measured voltage distributions at EOC-6, and the results compared with the projections performed at BOC 6. The total number of indications found at TSPs in all SGs during the current inspections is less than that projected at the beginning of the cycle using a POD of 0.6 (6856 projected vs 6783 4 actual). The largest SLB leak rate based on the actual EOC 6 bobbin voltage l distributions is calculated for SG C and its magnitude is 11.5 gpm; this value is well l '
below the allowable Cycle 6 SLB leakage limit of 26.8 gpm. The largest burst probability corresponding to the measured EOC 6 bobbin voltage distributions is calculated for SG A; its magnitude is 1.9x108, which is also well below the NRC reporting guideline of 10r 2 for the conditional tube burst probability. However, for 23s A, C and D, the projected EOC 6 peak voltage and SLB leak rate are less than those based on the actual measured data. The difference in SLB leak rate is more pronounced for SG C, and it is attributable to just three indications which had a growth larger than the maximum projected growth. Effort is underway to identify the cause for underpredicting the tail of the EOC voltage distributions and, if ,
necessary, to revise the analysis methodology so that EOC-7 projections would not be l underestimated. Tb results will be documented in the 90 day report. l i
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A total of 6783 indications were found in the EOC-6 inspection, of wh'ch 647 were inspected with a Rotating Pancake Coil (RPC) probe including a minimum of 20 % -
oflocked tube modelindications (hot leg side indications) between 1 and 3 volts and ,
alllocked tube modelindications above 3 volta. The RPC inspection confirmed 558 -
indications as flaws, which included 508 indications above 1.0 volt. SG C had 2103 bobbin indications and 716 of those were above 1.0 volt; 126 indications were inspected by~ RPC and 108 were confirmed as flaws. One hundred and seven indications were found above 3 volts in all SGs combined, of which 39 were found in SG C. All but one indication over 3 volts were confirmed by RPC, and they were all repaired. A single circumferentialindication was found in a large dent at TSP 5H in SG A. No other unexpected inspection results such as indications extending '
outside the TSP or PWSCC at dented TSP intersections were found.
3.0 EOC-6 Inspedian Results and Vokage Growth Rates 3.1 EOC-6 Inspedian Results +
In accordance with the IPC guidance provided by the NRC Generic Letter 95 05 (Reference 2), the EOC 6 inspection of the Braidwood Unit 1 SGs consisted of a complete, fulllength bobbin probe examination of the tube bundles in all four SGs.
A 0.610 inch diameter bobbin coil probe was used for all hot and cold leg TSP intersections where IPC was applied. Subsequently, RPC examination was performed
- for a minimum of 20 percent of locked tube model indications with an amplitude between 1 and 3 volts, all locked tube model indications with an amplitude 3 volts and above, and all of free span model indications (cold leg side indications) with an amplitude above 1 volt. One hundred and seven indications were found above 3 volts, of which 39 were found in SG C, and they were all confirmed by RPC and repaired.
A total of 30 free span modelindications were found, and 2 of those were above 1 volt; they were both confirmed by RPC inspection and repaired.
In addition, an augmented RPC inspection was performed consistent with the NRC
- requirements. All dented intersections with a bobbin voltage greater than 5 volts and a minimum of 20 percent of intersections with a bobbin voltage between 2.5 and 5 ;
volts were inspected with RPC. The augmented RPC inspection also included one TSP l intersection with a mixed residual artifact signalin SG C, but it was not confirmed, i
A single circumferential indication was detected in a large dent at TSP 5H in SG A.
There were no other RPC circumferential indications at the TSPs, ne indications l extending outside the TSPs, no RPC indications with potential PWSCC phase angles, I no other flaw indications on dents at any dent voltage and there was no signal interference from copper deposits.
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- l A summary of EC data for TSP indications in all four steam generators is shown in Table 1. The table shows the number of field bobbin indications, the number of these l field bobbin indications that were RPC inspected, the number of RPC confirmed ;
indications, and the number of repaired indications. The indications that remain !
active for Cycle 7 operation is the difference between the observed and the repaired.
The following is an overall summary of the EC data for all four steam generators of '
Braidwood Unit 1. l 1
- Out of a total of 6783 indications identified during the inspection, a total of 6426 indications are expected to be returned to service for Cycle 7.
- A total of 647 were RPC inspected including two free span modelindications.
- A total of 558 were RPC confirmed including two free span modelindications.
- Consistent with the new 3 volt IPC, a total of 276 indications were removed from service RPC confirmed locked tube model indications with a bobbin amplitude of less than or equal 3.0 volts and RPC confirmed free span model indications less than or equal to 1 volt are not removed from service unless they are at intersections excluded from IPC.
A review of Table 1 indicates that SG C has more and highe: BOC-7 indications (a quantity of 2015, with 660 indications above 1.0 volt) than SG A, B or D, thereby it potentially will be the limiting SG at EOC 7. SG C also had the largest iudication (10.5 volts) found in the EOC 6 inspection. Figures 1A and IB show the actual bobbin voltage distribution determined from the EOC 6 EC inspection, Figure 2 shows the population distribution of those EOC 6 indications which were repaired and taken out of service, and Figure 3 shows the indications which are being returned to service for Cycle 7. The indications removed from service, a total of 276, include 109 RPC confirmed indications above the IPC repair limits. The remaining repaired indications were in tube segments near the wedge locations where IPC does not apply, or in tubes plugged for degradation mechanisms other than ODSCC at TSPs.
3.2 Voltage Growth Rates Table 2 shows cumulative probability distribution function (CPDF) for growth rate :
I of each Braidwood Unit I steam generator during Cycle G on an effective full power year (EFPY) basis. Among the four steam generators, SG A had a slightly larger l average voltage growth during Cycle 6 than other SGs; however, SG C had 6 of the ,
10 indications with the largest voltage growth. Figure 4 provides a comparison of the l composite voltage grov?th from all four steam generators for the last four operating periods (Cycles 4,5A,5B and 6); Table 3 shows the same data in a tabular form. The Q \npe\cre97\cce97rtp wp5 3-1 l
i averags growth rate on an EFPY basis during Cycle 6 for all SGs combined is higher 1 than the last cycle (Cycle 5B, a half cycle) and Cycle 4 (a full cycle); however, it is i below that observed for Cycles 5A (another half cycle).
It is evident from Table 3 that during Cycle 6 more indications experienced high growth than in any of the previous cycles. During the last full operating cycle, Cycle 4,10 indications had growth above 3 volts on an EFPY basis. The last two cycles, which were actually half cycles, had 9 and 4 indications, respectively, with growth above 3 volts (on an EFPY basis). However, during Cycle 6, 45 indications had growth above 3 volts (on an EFPY basis). Because of unusually large number of -
indications with high growth during Cycle 6, the tail of the EOC 6 voltage ;
distributions projected at BOC 6 using the last two cycles of data are not conservative; consequently, the projected EOC 6 leak rates are also not conservative as discussed in Section 6.
3.8 NDE Unentainties The NDE uncertainties applied for the Cycle 6 voltage distributions in the Monte Carlo analyses for leak rate and burst probability are the same as those previously I
reported in the last Braidwood Unit 1 IPC 90 day report (Reference 3). The probe wear standard used in the analyses has a standard deviation of 7.0 % about a mean 4 of zero and a cutoff at 15 % for voltage response variability, which is consistent with the alternate probe wear measurement approach used during the EOC 6 inspection.
The analyst variability uncertainty has a standard deviation of 10.3% about a mean ;
of zero with no cutoff.
4.0 Database Applied for IPC Correlations The database used for the IPC correlations applied in the analyses of this report are the same as those used for the analyses reported in the last 90 day oport (Reference ,
- 3). The database is in compliance with the NRC guidelines for application of leak rate versus voltage correlations and for removal of data outliers in the 3/4 inch tubmg i burst and leak rate correlations. This is documented in Reference 4. l
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5.0 SLB Analysis Methods i
Monte Carlo analyses are used to calculate the SLB leak rates and tube burst l probabilities for actual voltage distributions. The methodology used complies with the Braidwood Unit 1 SER and is described in the Westinghouse generic methods report of Reference 1.
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Monte Carlo analyses for leak rates and tube burst probabilities include NDE uncertainties. Based on the 3/4" diameter tubing database, the NRC requirement
. that the p value obtained from the regression analysis be less than or equal to 5% to apply the SLB leak rate versus voltage correlation is satis 6ed and the correlation is applied for the leak rate analyses of this report.
SLB leak rates and tube burst probabilities are calculated considering the locked TSP condition. With TSPs locked by tube expansion, locked tube model indications are restrained from bursting so the burst probability estimates are largely determined by free span model indications. Since only a small number of free span model indications were found (combined total from all SGs is 30), the burst probabilities are t
expected to be small. Leak rates and tube burst probabilities calculated using the actual voltage distributions are compared with the corresponding prior projections for EOC 6.
6.0 SLB Imak Rate and Tube Burst Probability Ar EOC-6 Using the methodology described above, analyses were performed to calculate EOC 6 SLB leak rates and tube burst probabilities for the actual bobbin voltage distributions ,
presented in Table 1. The analyses considered the locked TSP condition. The results I of the Cycle 6 Monte Carlo calculations are summarized in Table 4. Comparison of the EOC 6 actuals with the corresponding predictions indicates the following:
a) The total number ofindications found at TSPs in all SGs combined during the l current inspections is less than that projected at the beginning of the cycle using a POD of 0.6 (6856 projected vs 6783 actual). The number of projected -
indications exceeds the actuals in SG C (limiting SG) and SG B but is less in SGs A and D.
b) SG C was predicted to be the limiting steam generator for EOC-6 from SLB
' tube leak rate standpoint, and SG A was predicted to be limi',ing for burst
- probability.
I c) Actual measured EC data for EOC-6 confirmed SG C to have the highest tube leak rate and SG A to have the highest hurst probability, i
d) The largest SLB leak rate based the actual EOC 6 bobbin voltage distributions is calculated for SG C and its magnitude is 11.5 gpm (compared to projected value of 6.99 gpm); this value is lower than the allowable Cycle 6 SLB leakage limit of 26.8 gpm. The largest burst probability corresponding to the measured EOC 6 bobbin voltage distributions is calculated for SG A, its magnitude is 1.9x10 (less than projected value of 6.8x104 ); and it also is lower than the Q:\ ape \cce97\cceD7ttp.wp5 5-
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NRC reporting guideline of 10'8 for the conditional tube burst probability.
e) For SGs A, C and D, the projected EOC 6 peak voltage and SLB leak rate are less than those based on the actual measured data. The differences are more
! . pronounced for SG C and are attributable to just three indications which had 4
a growth larger than the maximum projected growth.
i In summary, the limiting SLB leak rate (11.5 gpm) and tube burst -probability (1.9x10) calculated using the actual EOC-6 bobbin voltage distributions are below ,
their respective allowable limits. However, for SGs A, C and D, the projected EOC 6
' peak voltage and SLB leak rate are below those based on the actual measured data.
The differences, which are more pronounced for SG-C, are attributable to a small number of indications which had a growth larger than the maximum projected
- growth.' Effort is underway to identify the cause for underpredicting the tail of the EOC voltage distributions and, if necessary, to revise the analysis methodology so that EOC 7 projections would not be underestimated. These results will be
- documented in the 90 day report.
j 7.0 Refer-vu
- 1. WCAP-14277, "SLB Leak Rate and Tube Burst Probability Analysis Methods for ODSCC at TSP Intersections", Revision 1, Westinghouse Nuclear Services Division, December 1996.
- 2. NRC Generic Letter 95 05, " Voltage Based Repair Criteria for the Repair of Westinghouse Steam Generator Tubes Affected by Outside Diameter Stress Corrosion Cracking", USNRC Office of Nuclear Reactor Regulation, August 3, 1995. ;
- 3. NSD SGD-1204, "Braidwood Unit 1 Cycle 6 Interim Plugging Criteria - 90 Day i Report", Westinghouse Nuclear Service Division, February 1996. l
- 4. NSD SGD 1212, " EPRI ARC Databases for 3/4" and 7/8" Dia. Tubes and l Updated ARC Correlation for 7/8" Dia. Tubes," Westinghouse Nuclear Services Division, February 26,1996. l l
WCAP 14273, ' Technical Support for Alternate Plugging Criteria with Tube !
5.
Expansion at Tube Support Plate Intersections for Braidwood-1 and Byron 1 l Model D Steam Generators," Westinghouse Nuclear Service Division, February 1995.
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Table 1 (Sheet 1 of 4)
Braidwood Unit 1 April 1997 Outage .
Summary of Inspection and Repair for Tubes in Service During Cycle 6 Steam Generator A Steam Generator B St== Generator C in-Service Durins Cyde DOC-7 Im4ervice Durtm8Cyde DOC-7 In-Sardee Dartes Cyde 30C-7 1
" arc arc Insnm.ms a Mas
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! arc - hampues a less Valenge m 8""'s em w Tubes
,75 m them temeness w w ,33 ,,,,,,,,,
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an. m 3,,,,,,,
ame amesone amem omer emes one 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1 0.2 10 1 0 0 10 9 8 0 0 0 8 8 5 0 0 0 5 5 I I 78 77 38 0 0 37 37 47 0 0 1 46 45 03 ' 79 2 77 0 5
0 77 76 139 3 0 3 IM L33 04 7 57 5 I 5 152 150 1 0.5 187 7 5 7 180 179 102 0 0 I 101 101 199 1 0 7 192 191 94 I I 3 91 91 217 0 8 209 258 76 217 4 3 7 210 210 1 4 2 3 213 211 0.7 177 6 2 6 171 168 87 1 1 2 85 85 216 4 IM 87 0 0 86 86 212 2 0 3 209 207 78 144 5 7 137 1 09 150 3 2 7 143 142 69 1 0 5 64 63 194 I O 5 189 188 4 5 110 109 63 0 0 1 62 62 158 2 1 2 156 155 1 115 5 1.1 99 32 28 4 95 93 48 0 0 0 48 48 lit 2 I I 110 ISD 1.2 79 32 27 3 76 72 38 0 0 0 38' 38 113 I i 4 109 109 22 20 2 50 49 21 0 0 0 21 21 93 2 1 2 90 59 13 52 1.4 59 21 17 4 55 51 18 0 0 0 18 18 69 0 0 2 67 67 14 0 35 35 8 0 0 0 8 8 61 0 0 1 60 60 1.5 35 14 22 7 7 21 21 11 2 2 0 11 11 47 3 1 4 43 4!
1.6 1 1.7 24 12 11 2 22 21 9 0 0 0 9 9 37 2 7 1 36 %
1.8 23 !! Il i 22 22 3 0 0 0 3 3 26 0 0 0 26 26 1.9 20 7 7 1 19 19 5 0 0 0 5 5 24 2 I I 23 22 2 22 14 14 1 21 21 4 2 2 0 4 4 18 2 2 0 18 18 2.1 13 8 8 0 13 13 4 4 4 0 4 4 13 12 12 0 13 13 2.2 9 9 9 0 9 9 1 1 I O I i 11 8 8 0 it il 23 8 6 5 0 8 7 2 2 2 0 2 2 12 10 10 0 12 12 7 9 6 6 i 8 8 I I I O I I il 6 5 0 Il 10 2.5 9 9 9 0 9 9 1 1 1 0 I I 5 6 6 0 8 8 76 I I I O I i i I i O I I 2 2 2 0 2 2 8 7 7 7 8 8 8 1 1 0 I I 5 3 2 0 5 4 2.7 5 5 5 4 4 0 0 0 0 0 0 4 3 3 0 4 4 2.8 1 2.9 5 4 4 0 5 5 0 0 0 0 0 0 7 6 6 0 7 7 3 4 3 3 0 4 4 0 0 0 0 0 0 5 3 3 0 5 5 3.1 5 5 5 5 0 0 2 2 2 2 0 0 3 3 3 3 0 0 7T I I I I O O O O O O O O 3 3 3 3 0 0 33 3 3 3 3 0 0 1 I I I O O 2 2 2 2 0 0 7- 2 2 2 2 0 0 1 1 1 I O O 5 5 5 5 0 0 I I I I O O I I I I O O 0 0 0 0 0 0 3.5 36 0 0 0 0 0 0 I I & I O O l i I I O O 3.7 2 2 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7F 0 0 0 0 O I I I I O O 1.9 I I I I O O O O O O O I I O O O O O O O O 2 2 2 2 0 0 4 I I Table Continues on Next Page
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Table 1 (Sheet 2 of 4)
Braidwood Unit 1 April IW7 Outage ,
Summary of Inspection and Repair for Tubes in Service During Cycle 6 Stearn Generator A Stearn Generator B Steent Generator C Indervice Durig Cyde 800-7 t h Dein8Cyde DOC-7 Im4ervice Durim8 Cyde B(C4 As com,=.e rhae AE cad-m4 phid AB Tube Os@unt rhae ,,e ,,c ,,c ,,c ,,e ,,
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& feet amamrund Venage
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im seem o=s1 m ouer sw.am. Imam amar Table Coellaues froen Previous Page 4.1 2 2 2 2 0 0 0 0 0 0 0 0 I I I I O l 0 4.2 0 0 0 0 0 0 0 0 0 0 0 0 1 1 I I O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 43 0 0 I I O O O O O O O O O O O O O O 4.4 I I I I I O O O O O O O O O O O O O 4.5 I 4.6 0 0 0 0 0 0 0 0 0 0 0 0 I I I I O O 0 0 0 0 0 0 0 0 0 0 0 0 t i I I O O 4.7 0 0 0 0 0 0 0 0 0 0 0 I I I i 0 0 4.8 0 I I I 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4.9 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 0 0 0 5.s 2 2 2 2 0 0 0 0 0 0 0 0 1 1 1 I O O 5.2 I I I I G 0 0 0 0 0 0 0 t i I I O O 0 0 0 l i I I O O O O O O O O 5.3 0 0 0 54 0 0 0 0 0 0 0 0 0 0 0 0 I I I I O O 5.5 0 0 0 0 0 0 0 0 0 0 0 0 I I I I O O 5.6 t I I O O O O O 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 2 2 2 2 0 0 5.7 5.8 0 0 0 0 0 0 0 0 0 0 0 0 1 I I I O O
[
6 0 0 0 0 0 0 0 0 0 0 0 0 I I I I O O I I O O O O O O O O O O O O O O 6.1 1 1 6.2 0 0 0 0 0 0 0 0 0 0 0 0 1 I I I O O 6.28 0 0 0 0 0 0 0 0 0 0 0 0 I I I I O O 6.36 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 6 48 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 74 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 94 7.31 0 0 0 0 0 0 0 0 0 0 0 0 I I I I O O 0 0 0 0 0 0 0 0 0 0 0 0 I i 1 1 0 0 7.41 0 0 0 0 0 0 0 0 0 0 0 0 1 I I I O O 7J3 I 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8.55 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8 82 0 I O O O O O O O O O O O O O 8.94 I i 1 O 0 0 0 0 0 0 0 0 0 0 0 0 1 I I I O O 9.15 0 0 0 0 0 0 0 0 0 0 0 0 t i I I O O 9.82 0 0 0 0 0 0 0 0 0 0 I I I 1 0 0 10 48 0 0 266 94 1676 1652 908 26 24 21 787 785 2103 126 108 87 20l5 19FF Total 1770 296 49 485 472 183 22 22 7 176 176 716 112 105 55 660 653
>lv 534 258 241 28 28 0 0 7 7 7 7 0 l 0 39 39 39 39 0 0
> 3V 28 2R Table 1 (Sheet 3 of 4)
Braidwood Unit 1 April 1997 Outage -
Summary of Inspection and Repair for Tubes in Service During Cycle G Steam Generator D Composite of AB SGs DOC-7 ledervice Dortug Cyde DOC 7 Ig-Service During Cyde AB Tubes C4 M ABT h ComArumed Retumed & Not krC BrC 5=a man === Reemamed A Met Voltage Die field R.am krC RFC indices.as as nespeceed ins, ress Camarmd Rsomered so W
_M Camaramed U -d Service Inde. Only Servie imetOut indicasses I 0 0 I I O O O I 0.4 1 0 1 35 0 0 35 34 0.2 ~ 12 0 0 0 12 12 1 4 88 87 256 5 3 7 249 247 03 92 3 2 206 589 15 2 13 $76 565 i 0.4 216 6 1 5 211 260 755 10 6 21 734 731 0.5 267 2 3 6 261 273 270 806 11 6 23 783 779 0.6 272 3 2 5 224 222 707 15 7 14 693 6?6 0.7 227 4 2 3 2 182 180 627 11 6 13 614 609 0.8 184 4 2 183 182 599 10 6 20 579 575 186 5 4 3 0.9 _ 4 122 464 18 14 12 452 448 1 128 il 9 124 98 91 358 50 38 7 351 341 1.1 100 16 9 2 3 73 66 306 51 39 10 296 285 1.2 76 18 11 75 72 243 42 36 6 236 238 13 77 18 15 2 44 190 27 23 6 184 ISO 1.4 44 6 6 0 44 '
0 34 34 138 19 19 1 137 137 IS 34 5 5 9 0 27 26 107 22 19 5 102 99 I .6 27 10 '
25 95 15 14 3 92 91 1.7 25 I I O 25 21 21 74 19 19 2 72 72 l .8 22 8 8 1 4 0 20 20 69 13 12 2 67 66 1.9 20 4 '
9 8 54 22 21 2 52 51 2 10 4 3 1 11 0 12 12 42 35 35 0 42 42 2.1 12 11 0 3 3 24 19 19 0 24 24 2.2 3 1 1 5 0 6 6 28 23 22 0 28 27 23 6 5 4 3 3 0 4 4 25 16 15 1 24 23 2.4 23 5 5 5 0 5 5 23 21 21 0 23 23 I I C 2 2 6 5 5 0 6 6 2.6 2 2.7 3 2 2 0 3 3 17 13 12 0 17 16 2.8 I I i 0 1 I 10 9 9 l 9 9 2.9 5 5 5 0 5 5 17 15 15 0 17 17 3 2 2 2 0 2 2 11 8 8 0 11 11 3.1 3 3 3 3 0 0 13 13 13 13 0 0 3.2 3 a 3 3 0 0 7 7 7 7 0 0 0 0 0 0 0 0 6 6 6 6 0 0 33 !
3.4 0 0 0 0 0 0 8 8 8 8 0 0 0 0 0 0 0 0 2 2 2 2 0 0 35 0 0 5 5 5 5 0 0 36 3 3 3 3 2 2 2 0 0 4 4 4 4 0 0 ,
3.7 2 I I I O O 1 I i 1 0 0 '
3.8 I I I I I O O 3 3 3 3 0 0 3.9 4 I I I I O O d 4 4 4 0 0 Table Continues on Next Page
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Table 1 (Sheet 4 of 4)
Braidwood Unit 1 April 1997 Outage -
Summary of Inspection and Repair for Tubes in Service During Cycle 6 Steam Generator D Counposite of AH SGs In-Service During Cycle DOC-7 Im4ervice Durtig Cycle DOC-7
_ M AR Tubes c - -
AE Telies C__.
Itetermed & Not RPC RPC Eh Returned & Net Voltage Fleid Inspected Imayeceed ComArmed lispelred #8 Imeretted Bin gebide ItPC RPC Indications le 1.dir esome 1, ;a ca nemed . .: ser*. lede. omar ser*e m only Table Continues from N-#_ Page
- 4. I I I I I O O 4 4 4 4 0 0 _
0 0 0 0 I I I I O O 42 0 0 O I I I l 0 0 43 I I I I O 0 0 0 0 0 t i i 1 0 0 4.4 0 0 0 0 l i I I O O 43 0 0 0 0 0 0 I I I I O O 4.6 0 0 0 0 0 0 0 I I I O O 4.7 0 0 1 I I O O 2 2 2 2 0 0 4.8 I I 0 0 I I i 0 0 4.9 0 0 0 0 1 2 2 0 0 2 2 2 2 0 0 5 2 2 0 0 5 5 5 5 0 0 5 2 2 2 2 0 0 3 3 3 3 0 0 5.2 I I 1 1 I I O O 2 2 2 2 0 0 53 I I I I I O O 2 2 2 2 0 0 5.4 I 0 0 0 0 t I i 0 0 53 0 0 i I I O O 2 2 2 2 0 0 5.6 1 1 I I I I O O 3 3 3 3 0 0 5.7 I i 0 0 2 2 2 2 0 0 5.8 I 1 0 0 0 0 0 0 1 I I I O O 6
I I I O O 2 2 2 2 0 0 6.1 1 I I i 0 0 2 2 2 2 0 0 ,
6.2 1 '
0 0 0 0 0 0 t i i 1 0 0 628 636 I i i 1 0 0 1 I I I O O 0 0 0 0 0 I I I O O 6.48 0 1 I I O O I I I I O O ;
6.74 1 1 I i I O O I I I I O O i 6.94 i 731 0 0 0 0 0 0 1 I I l' O O l I I I O O I 7.41 0 0 0 0 0 0 I 0 0 0 0 0 0 1 I I I O O 7.83 0 0 0 0 I I I O O 8.55_ 0 0 1 i l i O O I I I I O O
- 8.82 i 0 0 0 0 0 0 1 I I I O O 8.94 0 0 0 0 I I I I O O 9.15 0 0 0 0 0 0 I I I [ t 0 0 9.82 0 0 0 0 0 0 0 0 1 I I I O O 10.48 74 2028 1992 6783 647 558 276 6506 6426 Total 2l02 199 163 140 42 469 450 1944 551 508 153 1790 1751
>lV Sil 159 t
33 33 33 0 0- 107 107 107 107 0 0
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. 10 - - - _ _ _ _ _ - - _ _ - _ _ _ _ _ _ _ _ _ -
Tatne 2 (Shoot 1 of 2) .
Braidwooci Unit-1 AprH 1997 Outage Signal Growth Statistics for Cycle 6 on an EFPY Basis Steam Generator A Stenen Generator B Steaan Generseer C h Generator D Cumuslative Cycle 6 Cycle 55 Cycle 6 Cycle 5M Cycle 6 Cycle 5B Cycle 6 Cycle 58 Cyde6 Ddta Cycle 5B _
Volts No. of No. of No. of No. of No. of CPDF CPDF CPDF CPDF CPDF CPDF CPDF CPDF CPDF g g Inds 0 00 00 0 00 0.001 0 0.0 0.0 0 0.0 00 0 00
-1.7 0.0 0 00 0.0 0 00 0 001 0 00 00 0 0.0 0.0 0 0.0
-1 00 0 0.0 0.0 0 0.0 0 001 0 00 0.001 0 0.0 0.001 0 0.0
-0. 8 0.0 0 00 00 0 00 0 001 0 00 0.002 0 0.0 0.001 0 00
-0.7 0.0 0 0.0 0.002 0 00 0.001 0 00 0 003 0 0.0 0 001 0 0.0 06 00 00 0.002 0 00 0.003 0 00 0 005 0 0.0 0.002 0 00
-05 00 0 0 007 0 001 0.003 2 0.001 0.01 0 0.0 0.005 5 0.001
-0.4 0.001 2 0.001 1 0 003 0 011 2 0 004 0.009 12 0.007 0.018 6 0 003 0.011 23 0.004 43 0.007 3 0008 0.034 10 0.016 0 031 23 0 018 0.028 II 0.008 0 029 54 0 012 42 0 024 to 0.081 0.058 0 088 67 0 05 0.065 56 0.035 0.075 205 0.042
-0.1 0 063 48 0 036 34 0.127 0.228 91 0.171 0.199 220 0.155 0.218 237 0,148 0.203 7tN 0.147 0 0.181 161 0 306 0399 236 0 463 0.401 453 0371 0.433 608 0.437 0.403 1614 0385 0.1 0375 317 0 699 0.607 436 0379 0.614 480 0 666 0392 1497 0.607 0.2 0361 391 0327 0367 190 0 719 99 0 822 0.775 242 0.695 0.731 260 0.79 0.734 862 0.734 03 0 685 261 0.674 PC 60 08% 0.857 193 0787 0823 116 0.845 0 823 534 0.813 _
04 0.773 165 0.767 0.J 29 0.932 0.903 124 0 846 0.882 97 0.891 0.879 380 0 869 03 0 84 130 0 841 62 0876 0.917 13 0.948 0.935 69 0.879 0.912 52 0.916 0.915 1% 0 898 06 0.888 0.939 10 0.% 0.949 50 0.903 0.931 39 0.935 0.936 145 0.919 0.7 0.922 46 0.902 0 917 0 96 5 0 %7 0.%2 39 0.v21 0.949 24 0.946 0.954 95 0.933 08 0.945 27 0 929 0.968 5 0.973 0.974 29 0.935 0 %I 24 - 0.958 0.966 80 0.945 0.9 0 961 22 I8 0 94 0.975 3 0.976 0.981 20 0 945 0.973 8 0 961 _0976 49 0.952 1 0 97I 0.976 27 0 955 0.982 3 0.98 0.986 17 0.953 0.978 15 0.969 0 981 62 0.%I 1.1 0.984 10 0.96 0 986 3 0 984 0.989 18 0.%I 0.983 5 0.971 0.986 36 0.%7 1.2 9 0.966 0.987 4 0.989 0.991 8 0.%5 0 988 8 0.975 0.989 29 0.971 13 0 987 10 0.971 0.989 2 0.991 0 993 5 0.%8 0.991 10 0.98 0.991 27 0.975 1.4 0 991 0.992 8 0.976 -0.999 0 0.991 0.993 9 0.972 0.992 5 0.982 0.992 22 0.978 13 0 993 8 0.98 0993 2 0.994 0 995 11 0.977 0.993 4 0.084 0.994 25 0.982 1.6 0993 5 0.983 'O.993 1 0.995 0.997 4 0.979 0.996 2 0.985 0.995 12 0.984 1.7 6 0 986 0.995 0.996 0.997 7 0.982 0.997 2 0.986 0 996 16 0.986 I .8 0.993 1 0.988 0.996 0 0.996 0.997 3 0.984 0.997 2 0.987 0.996 8 0.987 1.9 0.995 3 0998 I O998 0 997 2 0.985 0 997 1 0.987 0 997 6 0.988 2 0997 2 0989 TeSte C==an--== en Next Page l
l l
Omweh slo TaNe 2(a) S/t2/97 6.23 PM
1 Tatne 2 (Sheet 2 of 2) '
- Braidwood Unit -1 April 1997 Outage Signal Growth Statistics for Cycle 6 on an EFPY Basis Steaua Generator C TAeana Generseer D Cummedsthe Steann Generator A Stenen Generator B Cycle 5B Cycle 6 Cycle 5B _ Cycle 6 Cycle 5B Cyde6 Cycle 6 Cycle 5B Cycle 6 Deh Cycle 5B CPDF CPDF CPDF CPDF CPDF CPDF CPDF CPDF CPDF CPDF Table Contimoes frena Prevlees Page 0.998 0 0.987 0.998 6 0.9891 0 991 1.0 1 0.999 0.997 2 0.986 2.1 0 998 3 0.986 0.998 2 0.988 0.998 4 0.9897 0998 0 992 0 0.999 0.997 1 2.2 1 0.9904 0 997 2 0.987 0.998 2 0.989 0.998 5 23 0 993 1 0 992 0 0 999 2 0.988 0.998 0.99 0.998 3 0.9908 2.4 0998 0 0 992 0 0.999 0.997 1 0 0.988 0.998 0.99 0.998 3 0.9933 0.998 2 0 993 0 0.999 0.997 1 2.5 0.0914 0 0 999 0 998 0 0.988 0.998 0 0.09 0 998 1 2.6 0 998 1 0994 0 989 0.998 I 0.99 0.999 3 0.9919 0 998 0.994 0 0 999 0.999 1 2.7 1 0.0926 0.999 4 0 99 0.998 0 0 99 0.999 5 2.8 0.998 1 0995 0 0.999 0 0.99 0.999 0.991 0.999 2 0 9929 0.998 I 0 995 0 0.999 0.999 1 2.9 0.9932 0.999 0 0.99 0.999 1 0.991 0.999 2 3 0 999 I 0 996 0 0.999 0.991 0.999 0 0.991 0.999 1 0.9934 0.999 0 0 996 0 0.999 0.999 1 3.1 0 0.991 0.999 0.992 0.999 1 0.9933 0 999 0 0 996 0 0.999 0.999 1 3.2 0.9938 0.999 0 0 998 0.999 2 0.993 0.999 2 33 0 999 0 0 996 0 0 999 0 991 0.999 0.993 0 999 2 0.9941 34 0 999 0 0 996 0 0.999 0.999 1 1 0.999 0 0.991 1.0 0.994 1.0 1 0.9942 3.5 0.999 0 0 996 0 0 999 1 0.999 3 0.993 2 0.995 10 5 0.9950 3.6 0.999 0 0 996 0 0.999 0.999 0.993 0 0.995 1.0 3 0.9954 3.7 0 909 2 0.997 0 0.999 1 1.0 0 999 0 0.993 0 0.995 1.0 1 0.9956 38 0.999 0 0.997 1 0 999 0 994 0.995 1.0 3 0.9960 3.9 0.999 0 0 997 0 2 1 0 0.999 0 0.994 0 0.995 1.0 2 0.9963 4 0 999 2 0.998 0 1.0 0.995 0 0 995 1.0 1 09965 41 0.999 0 0 998 1 0 2 0.996 4 0.997 1.0 7 0.9975 4.2 1.0 1 0 999 0 2 0.997 0 0.997 2 0.9978 4.5 0 0.999 .
46 0 0 909 0 d# 1 0.997 0 0.997 1 0.9979 0 0 0.997 2 0.998 2 0.9982 4.7 0 0.999 0 0 0.997 1 0.999 1 0.9984 5 0 0.999 0 0 0 997 2 1.0 2 0.9987 53 0 0 999 0 0.998 0 I .0 I 0.9988 58 0 0.999 1 0 2 0.999 1 1.0 3 0.9993 6 0 0.999 0.999 0 1 0.9994 6.3 0 0 999 0 1 0 0 0.999 0 1 0.9996
- 7. I I 0.999 0 0.999 0 1 0.9997 73 1 1.0 0 0 2 1.0 81 0 0 2 1.0 2095 2099 6771 Total 1770 807 Neth min Tetde 2h $112/97 6 23 PM
. . _ . . _ . _ _ ._ __ . _ . __ .- - a
1 Tcble 3 (Sheet 1 of 2)
Braidwood Unit 1 l Sigtal Growth Statistics on an EFPY Basis l l
CYCLE 4 CYCLE 5A CYCLE 5B CYCLE 6 Deka Voks No. of " 'I "* **
CPDF CPDF CPDF CPDF Obs Obs Obs Obs 1.7 0 0 0 0 1 0.0002 0 0 0 0 0 0 1 0.0005 0 0 1.0 0.8 0 0 0 0 1 0.0007 0 0 0 0 0 0 1 0.0010 0 0
-0.7 0 0 0 0 2 0.0015 0 0 0.6 0 0 0 0 4 0.0024 0 0
-0.5 44 0 0 6 0.0015 10 0.0048 5 0.0007
-0.3 0 0 19 0.0064 25 0.0109 23 0.0041 0.2 0 0 50 0.0193 75 0.0290 54 0.0121 0 0 181 0.0659 190 0.0750 205 0.0424 0.1 0.2109 531 0.2033 709 0.1471 00 702 0.2667 563 0.1 404 0.4050 598 0.3648 824 0.4026 1614 0.3855 0.2 422 0.5617 564 0.5100 783 0.5919 1497 0.6066 0.3 346 0.6810 462 0.6290 586 0.7336 862 0.7339 0.4 P1 0.7700 363 0.7225 369 0.8228 534 0.8127 0.5 143 0.8290 263 0.7902 231 0.8786 380 0.8689 0.6 98 0.8660 194 0.8401 151 0.9151 196 0.8978 0.7 79 0.8990 169 0.8836 88 0.9364 145 0.9192 0.8 51 0.9225 102 0.9099 74 0.9543 95 0.9332 0.9 37 0.9400 64 0.9264 50 0.9664 80 0.9451 1.0 31 0.9510 56 0.9408 38 0.9756 49 0.9523 1.1 29 0.9648 49 0.9534 21 0.9807 62 0.9615 1.2 12 0.9711 32 0.9616 21 0.9857 36 0.9668 1.3 12 0.9759 30 0.% 94 13 0.9889 29 0.9711 l l
1.4 8 0.9777 25 0.9758 10 0.9913 27 0.9750 f 1.5 7 0.9811 17 0.9802 2 0.9918 22 0.9783 1.6 4 0.9833 6 0.9817 9 0.9940 25 0.9820 1.7 5 0.9852 12 0.9848 5 0.9952 12 0.9838_
l.8 5 0.9866 4 0.9858 2 0.9956 16 0.9861 1.9 3 0.9881 10 0.9884 3 0.9964 8 0.9873 2.0 4 0.9896 2 0.9889 3 0.9971 6 0.9882 2.1 0 0.98 % 5 0.9902 3 0.9978 6 0.9891 2.2 3 0.9907 5 0.9915 0 0.9978 4 0.9897 2.3 4 0.9922 4 0.9925 1 0.9981 5 0.9904 2.4 2 0.9930 5 0.9938 0 0.9981 3 0 9908 2.5 1 0.9937 4 0.9949 0 0.9981 3 0.9913 2.6 0 0.9937 2 0.9954 1 0.9983 1 0.9914 2.7 3 0.9948 3 0.9%1 1 0.9985 3 0.9919 2.8 0 0.9948 2 0.9%7 0 0.9985 5 0.9926 2.9 1 0.9955 0 0.9%7 1 0.9988 2 0.9929 3.0 2 0.9 % 3 4 0.9977 1 0.9990 2 0.993' 1
Table Continues on Next Page 13 -
mehere ukTaWe 1 IV129M 11 PM
1 o 1
. 1 Table 3 (Sheet 2 of 2) -l Braidwood Unit 1 Signal Growth Statistics on an EFPY Basis i CYCLE 4 CYCLE 5A CYCLESB CYCLE 6 Deha voks No. of No. of N *# No. of CPDF CPDF CPDF CPDF Obs Obs Obs Obs Table Continues from Previous Page 0 0.9 % 3 2 0.9982 0 0.9990 1 0.9934 3.1 0.9970 2 0.9987 0 0.9990 1 0.9935 3.2 2 0 0.9970 0 0.9987 0 0.9990 2 0.9938 3.3 0.9978 0.9990 0 0.9990 2 0.9941 3.4 2 1 0 0.9978 0 0.9990 2 0.9995 1 0.9942 3.5 3.6 0 0.9978 0 0.9990 0 0.9995 5 0.9950 0 0.9978 0.9992 0 0.9995 3 0.9954 3.7 1 0.9981 0 0.9992 0 0.9995 1 0.9956 3.8 1 3.9 0 0.9981 1 0.9995 0 0.9995 3 0.9960 4.0 0 0.9981 0 0.9995 0 0.9995 2 0.9%3 0 0.9981 0 0.9995 1 0.9998 1 0.9 % 5 4.1 4.2 1 0.9985 1 0.9997 1 1.0 7 0.9975 4.5 1 0.9989 0 0.9997 0 2 0.9978 4.6 0 0.9989 0 0.9997 0 1 0.9979 4.7 0 0.9989 0 0.9997 0 2 0.9982 5.0 0 0.9989 0 0.9997 0 1 0.9984 5.3 0 0.9989 0 0.9997 0 2 0.9987 0 0.9989 1.0 0 0 0.9987 5.7 1 5.8 0 0.9989 0 0 1 0.9988 6.0 1 0.9993 0 0 3 0.9993 i 6.3 0 0.9993 0 0 1 0.9994 7.1 0 0.9993 0 0 1 0.9996 7.3 0 0.9993 0 0 1 0.9997 7.5 1 0.99 % 0 0 0 0.9997 8.1 0 0.99 % 0 0 2 1.0 9.0 1 1.0 0 0 0 Total 10 9 4 6771 1
I multgrthalsTable) 2311W'.20 PM
e Ta& 4 Braidwood Unit-1 April 1997 Outage l Sununary d ('aladations d EOC-6 ~ Tube Imale Rate and Burst Probability C& ison d Results Ramad on Adual and Paujected Voltage Distribution l
! Burst Probability SLB ,
Na of Max. Leak
. SG Indiantimi POD Indio. Volts
- 1 Tube 2 Tubes Rate ationsm sprn i EOC - 6 PROJECI10NS Negligible
- Negligibl#
Imked Tube Modef" 0.6 1679 8.2 5.61 A Free Span Model* 0.6 18 3.4 6.81x104 < 4.0x105 0.02 .
I Total 0.6 1697 - 6.81x104 < 4.0x10' 5.63
- Locked Tube Model 0.6 916 7.9 Negligible
- Negligible
- 2.35 B Free Span Model 0.6 8 2.6 2.04x104 < 4.0x108 0.005 j
Total 0.6 924 - 2.04xin4 < 4.0x 10' 2.36 l Negligible
- Negligible
- 6.99
< Locked Tube Model 0.6 2446 8.4 C Free Span Model 0.6 2 1.5 < 4.0x10' < 4.0x10' O.0 Total 0.6 2448 - < 4.0x10' < 4.0x10' 6.99 Locked Tube Model 0.6 1769 8.3 Negligible
- NegligiblP 6.2 D Cold Side 0.6 18 3.4 1.07x104 < 4.0x10' O.0 Total 0.6 1787 - 1.07x 104 < 4.0x10' 6.2 EOC-6 ACTUAIE (Tube Support Plates Assumed Locked)
Locked Tube Model 1 1754 10.2 Negligible
- Negligible
- 6.39 A Free Span Model 1 16 1.5 1.9x10 6 < 4.0x108 1.0x104 6
Total - 1770 - 1.9x 10 < 4.0x 10' 6.39 locked Tube Model 1 801 5.8 Negligible
- Negligible
- 0.36 B Free Span Model 1 7 0.8 < 4.0x108 < 4.0x108 1.0x 104 6
Total - 808- - < 4.0x10 < 4.0x105 0.36 Locked Tube Model 1 2008 11.9 Negligible
- Negligible
- 11.5 I C Free Span Model 1 4 0.6 < 4.0x10' < 4.0x106 1.0x 104 6
Total - 2102 - < 4.0x10* < 4.0x10 11.5 {
Locked Tube Model 1 2099 9.7 Negligible
- Negligible
- 6.99 5
D Free Span Model 1 3 0.6 < 4.0x10' < 4.0x10 1.0x104 Total - 2102 - < 4.0x106 < 4.0x106 6.99 (1) Num 3er of indications adjusted fo'r POD. (3) Below 10 "' (Reference 3).
(2) Voltages include NDE uncertainties from (4) Hot leg side indications Monte Carlo analyses and exceed measured (5) Cold leg side indications voltages.
QAape\cce97\cce97rtp.wp5 15 -
f 1
Figure 1A Braidwood Unit -1 April 1997 Outage Bobbin Voltage Distributions at EOC-6 for Tubes in Service During Cycle 6 300 ,
i 250 -
BA l BB 200 - - - - - - - -
h DC e - ~
~
f 150 -
j -
100 - -
m-- ----
50 -
g '
E EL BE ELRE. R- i n. -- =_ _
._n ._ . - -. ,
ggg;;g;;; "O35$05S"2%?AU%0%0"?"2AEE?EE' Bobbin Voltage Bobnrpc.shFiglal .
O e
Figure IB Braidwood Unit -1 April 1997 Outage Bobbin Voltage Distributions at EOC-6 for Tubes in Service During Cycle 6 5
4- - --
ESG-A ESG-B E
j 3- -- - - - - - - -
ESG-C 4
_a Tw ESG-D 1
E2- - - -
Z i l
l l ._ _ _ . _ _
1
' ' ' A' ' - ^ ' -
0 2OO!O!OO$*2 O O 3 2 *n 2%*20$**y{53{33((4Og; Bobbin Voltage
& % akhglbi e
Figure 2 ~
Braidwood Unit 1 April 97 Outage Bobbin Voltage Distribution for Tubes Plugged After Cycle 6 Service 9
8- - - - - - - - - -
]
l 7- -- -- --
EA 6- - -
gB ig 5-ac .
g 5 l y4 _ . . ._. __
E 3- - -- --
mi I
. iiii1 11 I- I
..222a20SDS3??????OOOO222?'
l-o . . . . . . . . . . .
1 I-II : :
II---
Oyy5$$$2 Bobbin Voltage Bohnrpc.nhFig2
. ._ __ ._...___m. _
Figure 3 Braidwood Unit 1 April 97 Outage Bobbin Voltage Distributions for Tubes Returned to Service for Cycle 7 300 l
l
\ -
250 - - - - - - - - - ---
EA 200 - -- - -
5 lN E,
$ ! 5l 150 -
- - - EC j
{
.s ! l E ,
G l l ?l 100 - -
l
_;d; ; ; ; ; ; ; ; ; ; ; ; E L;Bh;aL;Bb;
- B _;Hm.;.m.nh; m n ; ; ,
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 Bobbin Voltage n.% .sne s
s, .
9 Figure 4 ,
Braiwood Unit-1 Multi-Cycle Growth -- All SGs Combined Cumulative Probability Distribution Function for Growth on an EFPY Basis
- :. :x :-
1.0 g __= _::_; :._::: ::..:.. :
0.9 - - - - - -
x' O.8 - - - l -- -
,Y j 0.7 - - -
-- - . . * - - Cycle 4 E -
= '
I 0.6 - -
Cycle SA
.g ,
.=o
- 3. 0.5 - Cycle 5B 3
.!i 0.4 -
.s a - Cycle 6 u!0.3-1 0.2 - - .--- - -
6 0.1 - - -
4 r
l * * '
0.0 e e o n y e m o ei y e e o n y c = o, n, e, o
m n
o e
n e
n o
a n o n ,
n n a n n m m m m ,
q o o o o o - - - - -
Bobbin Voltage nukgnh alwce-4 Cycles CwowthVl4M7 2tM PM