ML20100R737
| ML20100R737 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 02/29/1996 |
| From: | WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML20100R651 | List: |
| References | |
| NSD-SGD-1204, SG-96-02-002, SG-96-2-2, NUDOCS 9603120507 | |
| Download: ML20100R737 (43) | |
Text
_
WESTINGHOUSE PROPRIETARY CLASS 3 NSD-SGD '204 SG-96-02-002 BRAIDWOOD UNIT - 1 CYCLE 6 INTERIM PLUGGING CRITERIA 90 DAY REPORT February 1996 6
Westinghouse Eledric Corporation Energy Systems Business Unit Nudear Services Division P.O. Box 158 Madison, Pennsylvania 15663-0158 9603120507 960229 R
ADOCK 0500 6
WESTINGHOUSE PROPRIETARY CLASS 3 NSD-SGD-1204 SG-96-02-002 BRAIDWOOD UNIT - 1 CYCLE 6 INTERIM PLUGGING CRITERIA 90 DAY REPORT February 1996 O
Westinghouse Electric Corporation Energy Systens Business Unit Nudear Services Division P.O. Box 158 Madison, Pennsylvania 15663-0158 1
i Table of Contents l
Page No.
1.0 Introduction 1-1 2.0 Summary and Conclusions 2-1
. 3.0 EOC-5B Inspection Results and Voltage Growth Rates 3-1 3.1 EOC 5B Inspection Results 3-1 3.2 Voltage Growth Rates 3-2 3.3 NDE Uncertainties 3-3 4.0 Database Applied for IPC Correlations 4-1 5.0 SLB Analysis Methods 5-1 6.0 Bobbin Voltage Distributions 6-1 6.1 Calculation of Voltage Distributions 6-1 6.2 Probability Of Detection (POD) 6-2 6.3 Limiting Growth Rate Distribution 6-2 6.4 Cycle Operating Period 6-2 6.5 Projected EOC-6 Voltage Distributions 6-2 6.6 Comparison of Actual and Projected EOC-5B Voltage Distributions 6-3 7.0 SLB Leak Rate and Tube Burst Probability Analyses 7-1 7.1 Leak Rate and Tube Burst Probability for EOC-5B 7-1 7.2 Leak Rate and Tube Burst Probability for EOC-6 7-2 1
8.0 References 8-1 l
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l Braidwood Unit-1 l
Cyde 6 Interim Plugging Criteria 90 Day Report 1.0 Introduction This report provides the Braidwood Unit-1 steam generator tube Eddy Current (EC) inspection results at the end of Cycle 5* together with Steam Line Break (SLB) leak rate and tube burst probability analysis results calculated according to i
NRC guidelines, in support of the implementation of the recently approved 3.0 volt j
Interim Plugging Criteria (IPC). SLB leak rates and tube burst probsbilities were calculated for end of cycle (EOC) conditions of both the recently completed cycle l
(Cycle 5B) and the ongoing cycle (Cycle 6). Analyses for Cycle 5B were carried out using the actual bobbin voltage distributions measured during the EOC-50 outage, and the results compared with the corresponding values from projections performed during the last (EOC-5A) outage. The analyses for Cycle 5B considered conditions both before and after tube support plate (TSP) locking (to support a 3 volt IPC). Ho%ver, since the EOC-5B results represent completion ot" a cycle implementing a 1 volt IPC consistent with NRC guidelines, leak and burst analyses based on the free span analysis methods are the reference analyses. The results based on the assumptions of TSP locking are provided for information as sensitivity analyses. Analyses were also performed to project leak rates and tube burst probability for postulated SLB conditions at the end of the ongoing cycle (Cycle 6) based on the 3.0 volt repair criteria. Those analyses utilized bobbin voltage distributions and growth rates measured during the EOC-5B inspection.
The methodology used in these evaluations is in accordance with previously published Westinghouse reports (References 8.1,8.2 and 8.6) l l
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- Since there was a mid-cyde inspection in February '95, for clarity the first-half of Cyde 5 is i
referred to as Cycle 5A and the second-half as Cycle 5B.
s:\\spe\\cce95b\\cy6.90 day.wp5 1-1
)
2.0 Summary and Condusions SLB leak rate and tube burst probability analyses were performed for the actual l
EOC-5B EC bobbin voltage distributions as well as the projected EOC-6 bobbin voltage distributions. Results for the EOC-5B actual conditions are considerably lower than the corresponding projections, performed during the EOC 5A outage l
using a probability of detection of 0.6, by at least a factor of 4.8. As with the earlier projections, SG C was found to be the limiting SG at actual EOC-5B voltage distributions.
The leak rate and tube burst probability projections at EOC conditions for the current cycle (Cycle 6) are also well within acceptable limits, with SG C again being the limiting SG for leak.
For the actual EOC-5B bobbin voltage distribution, free span SLB leak rate (applicable prior to TSP locking) and tube burst probability are calculated to be 0.07 gpm and 6.49x10'4, respectively, for the limiting SG which is SG C; these values are below the corresponding BOC-5B projections for SG C assuming a voltage distribution adjusted using the NRC SER endorsed probability of detection of 0.6. Also, these values are much lower than the allowable Cycle 5B SLB leakage limit of 9.1 gpm and the NRC reporting guideline of 10 2 for the conditional tube burst probability. The corresponding EOC-5B values calculated for a locked TSP 4
condition are 0.07 gpm leak rate and a burst probability ofless than 4x10. Leak rate is not signincantly affected by the locked TSP condition due te the low free span burst probability (i.e., only a few indications restrained from burst, IRBs, would have yielded a higher leakage even if there was no TSP restraint). As expected, the tube burst probability is substantially reduced for the locked TSP condition. The allowable leakage limit for Cycle 6 has been increased to 26.8 gpm, so the leakage margin is even higher at the BOC-6.
Limiting SLB leak rate projected for the EOC-6 conditions (locked TSPs) using the NRC SER endorsed probability of detection of 0.6 is 6.99 gpm. This value is projected for SG C and it is well below the allowable EOC-6 leakage limit of 26.8 gpm. The limiting tube burst probability is projected for SG A, and its magnitude is 6.81x10 which is well below the NRC reporting guideline of 10 2. SG A has a higher EOC-6 tube burst probability than SG C since more cold leg indications were detected in it (11) than in SG C (1) during the current inspection. The projected EOC-6 leak rate and burst probability are higher than found at the actual EOC-5B condition due to the requirement to use the limiting growth rate distribution (Cycle 5A values) over the last two operating cycles for the projections.
The burst probability is dominated by the cold leg indications (no TSP locking in cold leg) utilizing the larger Cycle 5A growth rates.
A total of 4136 indications were found in the EOC-5B inspection of which 327 were inspected with a Rotating Pancake Coil (RPC) probe (including a minimum of 20
% of hot leg indications between 1 and 3 volts and all of the hot leg indications above 3 volts), and 200 were confirmed as Daws by the RPC inspection. The RPC l
l s:\\apc\\cce95b\\cy6_90 day.wp5 2-1
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confirmed indications included 178 above 1.0 volt.
SG C had 1480 bobbin indications, of which 301 were above 1.0 volt,83 of these were inspected by RPC l
and 46 were confirmed as flaws. Only one indication was found above 3 volts,3.17 volts in SG A, and it was confirmed by RPC. No unexpected inspection results were g
found at the TSP intersections, such as circumferential indications, indications extending outside the TSP or PWSCC at dented TSP intersections.
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1 s;\\apc\\cce95b\\cy6.90 day.wp5 22
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l 3.0 EOC-6B Inspedian Results and Voltage Growth Rates 3.1 EOC-5B Inspection Results In accordance with the IPC guidance provided by the NRC Generic Letter 95-05, the end of Cycle 5B inspection of the Braidwood Unit-1 steam generators (SG) consisted of a complete,100% EC bobbin probe fulllength examination of the tube bundles in all four SGs. A 0.610 inch diameter probe was used for all hot and cold leg TSPs where IPC was applied. Subsequently, RPC examination was performed for a minimum of 20 percent of hot leg indications with an amplitude between 1 and 3 volts, all of hot leg indications with an amplitude above 3 volts, and all of cold leg indications with an amplitude above 1 volt. There was only one hot leg indicati,n above 3 volts. It was confirmed as a flaw and plugged. Also, a single indication was found above 1 volt on the cold leg side, but no degradation was detected during RPC inspection.
In addition, an augmented RPC inspection was performed consistent with the NRC requirements. All dented intersections with a bobbin voltage greater than 5 volts i
and a minimum of 20 percent ofintersections with a bobbin dent voltage between 2.5 and 5 volts were inspected with RPC. The augmented RPC inspection also included 25 TSP intersections with mixed residual artifact signals (MRI). There were no RPC flaw indications reported in the augmented inspection.
i There was no evidence of any unexpected eddy current results at EOC-5B. There were no RPC circumferential indications at the TSPs, no indications extending i
outside the TSPs, no R?C indications with potential PWSCC phase angles, no flaw indications at dented TSP intersections at any dent voltage and there was no signalinterference from copper deposits. Thus, no flaw indications were found in the augmented RPC inspection. All RPC responses were consistent with that expected for ODSCC at TSP intersections.
A summary of EC indications for all four steam generators is shown on Table 3-1, which tabulates the number of field bobbin indications, the number of these field bobbin indications that were RPC inspected, the number of RPC confirmed indications, and the number of plugged indications. A further separation of data in Table 3-1 into hot and cold leg indications is given in Section 6. The indications that remain active for Cycle 6 operation is the difference between the observed and the plugged.
Overall, the combined data for all four steam generators of Braidwood Unit-1 shows that:
Out of a total of 4136 indications identified during the inspection, a total of 4083 indications are being returned to service for Cycle 6.
Of the 4136 indications, a total of 327 were RPC inspected.
s:\\ ape \\cce95b\\cy6.,90 day.wp5 3-1 i
~
l Of the 327 RPC inspected, a total of 200 were RPC confirmed.
A total of 53 indications were removed from service. Consistent with the new 3 volt IPC, hot leg indications with bobbin amplitude ofless than or equal to 3.0 volts and cold leg indications less than or equal to 1 volt are not I
removed from service. Only one indication was repaired due to ODSCC at TSP intersections.
A review of Table 31 indicates that SG C has more and higher voltage BOC-6 indications (a quantity of 1480, with 301 indications above 1.0 volt) than SG A, B i
or D, it potentially will be the limiting SG at EOC-6. However, SG A had the l
largest indication (3.17 volts) found in the EOC-5B inspection. Figure 3-1 shows the actual bobbin voltage distribution determined from the EOC-5B EC inspection; i
Figure 3-2 shows the distribution of those EOC-5B indications which were plugged and taken out of service; Figure 3-3 shows the indications which are being returned to service for Cycle 6. Of the 53 indications removed from service,38 indications were in tubes plugged for degradation mechanisms other than ODSCC i
at TSP's. Among the 15 ODSCC indications removed from service, only one j
l indication was above the 3 volt IPC limit, and the remaining 14 indications were l
in tubes near the wedge supports Sr which TSP IPC does not apply.
j The distribution of EOC-5B indications as a function of support plate is summarized in Table 3 2 and plotted in Figure 3-4.
The data show a strong predisposition of ODSCC to occur in the first few hot leg TSPs (3909 out of 4136 l
indications occurred at the first three hot leg TSP intersections), although the mechanism extended to higher TSPs. Only 18 indications were detected on the cold leg side. This distribution indicates the predominant temperature dependence of ODSCC at Braidwood Unit-1, similar to that observed at other plants.
3.2 Voltage Growth Rates For projection of leak rates and tube burst probabilities at the end of Cycle 6 operation, voltage growth rates were developed from the EOC-5B (October 1995) l inspection data and a reevaluation of the same indications from the EOC-5A (February 1995) inspection EC signals. Table 3-3 shows the cumulative probability i
l distribution for growth rate of each Braidwood Unit-1 steam generator during Cycle 5B (3/95 - 9/95) on an EFPY basis. This data is also plotted in Figure 3-5.
Among the four steam generators, SG A has the indication with the largest voltage growth as well as a slightly larger average voltage growth during Cycle 5B.
L Average growth rates for each SG during Cycle 5B are summarized in Table 3-4.
The average growth rates over the entire voltage range vary between 30% and 42%
l (of the BOC voltage) per EFPY, between SGs, with an overall average of 34% per EFPY. The average growth for indications greater than or equal to 0.75 volt is 28% per EFPY and for indications less than 0.75 volt it is 40% per EFPY. SG C had the highest average voltage at BOC-5B whereas SG A had the largest average a:\\apc\\cce95b\\cyG_90 day.wp5 3-2
l l
. voltage growth during Cycle 5B. This was found to be true during the last (EOC-i 5A) inspection also.
l Averaged composite voltage growth data from all four steam generators for the last four operating periods (4/91 - 9/92,10/92 - 3/94, 5/94 - 2/95 and 3/95 - 9/95) are summarized in Table 3-5. Figure 3-6 provides a comparison of the growth rate distributions for the last three operating periods. Growth rates for Cycle 5B are significantly below those observed for the preceding three operating periods.
Furthermore, except for Cycle 5A operating period, growth rates show a strong l
downward trend from the BOC-3.
Table 3-6 lists the largest growth rates above 1 volt, in descending order, that were developed during Cycle 5B. All but one indication shown are new indications and they were RPC confirmed. The EOC-5A voltages used to estimate growth rates for i
new indications were obtained by revaluating last inspection data. The largest TSP ODSCC indication detected during the inspection, 3.17 volts in SG A, does not l
appear in Table 3-6 because its estimated growth rate is below 1 volt. This indication was not reported in the last inspection possibly due to a noisy signal.
l The guidelines in the Generic Letter 95-05 require the use of the more conservative growth rate distributions from the past two inspections for projecting EOC distributions for the next cycle. From Figure 3-6 it is evident that growth rates for Cycle 5A are higher than those of Cycle 5B. Therefore, Cycle 5A growth rates are l
used to develop the EOC 6 predictions. The actual growth distribution used for EOC-6 projection is a worst case hybrid growth distribution that was developed during the last inspection (EOC-5A) and applied to project EOC-5B voltage distributions. This limiting growth rate distribution envelopes the actual EOC-5A l
distribution with the simultaneous limitations of SG A (highest average growth) i and of SG C (highest growth increment of 5.7 volts during Cycle 5A). Table 3-7 compares this hybrid growth distribution with the growth distributions observed for SG A and SG C during Cycle-5B. It is evident that the hybrid growth distribution is more conservative than the Cycle 5B growth rate distribution. This conservative growth distribution was imposed on all four steam generators, to provide a conservative basis for predicting EOC-6 performance.
l 3.3 NDE Uncertainties l
The NDE uncertainties applied for the Cycle 5B voltage distributions in the Monte L
Carlo analyses for leak rate and burst probabilities are the same as those previously reported in the Braidwood Unit-1 IPC report of Reference 8.1 and NRC 1
GL 95-05. The probe wear uncertainty has a standard deviation of 7.0 % about a i
mean of zero and has a cutoff at 15 % based on implementation of the probe wear standard. The analyst variability uncertainty has a standard deviation of 10.3%
about a mean of zero with no cutoff. These NDE uncertainty distributions are i
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included in the Monte Carlo analyses used to project the EOC-6 voltage l
distributions.
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e Tcble 3 -1 ( 1 ef 2)
Braidwood Unit-1 October 1995 Outage Summary ofInspection and Repair ForTubes in Service During Cycle SB Stenen Generator A Stensa Generator B Stessa Generator C In-Servke Dwing Cy le 5B BOC-6 In-Servke During Cycle SB BOC-6 In-Servke During Cyde 5B BOC.G AB AB AB veiemge Fletd Fleid RPC RW Indkation.
Indkattens Field RPC RPC Indkattene Indkst6 ens 8'"
inspected Confinned Repaired Returned Inspected Congirnied Repaired Returned Inspected Confinned Repaired Returned servke service
.%rvice 0.1 0
0 0
0 0
0 0
0 0
0 1
0 0
0 1
0.2 3
0 0
0 3
2 0
0 0
2 7
0 0
0 7
0.3 50 1
0 0
50 10 0
0 0
10 25 1
0 1
24 0.4 105 3
I i
104 65 1
1 0
65 122 1
0 1
121 0.5 139 2
2 3
136 60 1
0 0
60 168 5
1 1
167 0.6 144 3
2 3
141 95 0
0 0
95 164 3
2 3
161 0.7 117 4
3 5
112 68 0
0 0
68 199 3
0 3
1%
0.8t 115 1
0 1
114 63 1
0 1
62 200 5
I 3
197 0.9 104 I
I 2
102 52 1
I O
52 164 3
2 2
162 1
66 2
1 2
64 53 2
I O
53 129 1
0 2
127 1.1 67 9
5 1
66 25 25 16 0
25 107 8
5 0
107 1.2 45 4
2 0
45 28 25 11 0
28 71 8
5 1
70 1.3 24 2
1 0
24 12 12 9
0 12 36 9
5 0
36 1.4 16 3
2 0
16 7
7 3
0 7
28 12 4
1 27 1.5 8
6 5
0 8
5 4
1 0
5 25 14 7
0 25 1.6 8
8 7
1 7
2 2
1 1
I 8
7 4
0 8
1.7 4
2 2
0 4
3 3
2 0
3 7
7 4
0 7
1.8 7
7 6
I 6
2 2
1 0
2 5
5 3
0 5
1.9 1
1 1
0 1
0 0
0 0
0 4
3 2
0 4
2 3
2 1
0 3
3 3
3 0
3 I
I O
0 1
2.1 2
2 1
0 2
I I
O O
I 3
3 2
0 3
2.2 0
0 0
0 0
0 0
0 0
0 1
I I
O I
2.3 0
0 0
0 0
0 0
0 0
0 3
3 2
1 2
2.4 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
2.5 I
I I
O 1
0 0
0 0
0 0
0 0
0 0
2.7 1
1 0
0 1
0 0
0 0
0 0
0 0
0 0
2.8 0
0 0
0 0
0 0
0 0
0 I
I I
O I
3 0
0 0
0 0
0 0
0 0
0 1
I I
O I
3.2 1
1 I
I O
O O
O O
O O
O O
O O
Total 103I 66 45 21 1010 556 90 50 2
554 1480 105 52 19 1461
>lV 188 49 35 4
184 88 84 47 I
87 301 83 46 3
298 B0$fSFC M1a TeWe_%-3 t/ ten S-17FM 3-5
Table 3 - 1 ( 2 of 2)
Braidwood Unit -1 October 1995 Outage Summary of Inspection and Repair For Tubes in Service During Cycle 5B Stessa Generator D Casuposite of AE 4 SGs In-Service During Cyde 5B BOC-6 In-Service Dwing Cyde SB BOC-6
- E' RPC RPC ladications ladiesenens RPC RPC Indications I
i Im Re M WM Cen M W
RM M ladications y,gge,gi,,,
to to Servies Nervice 0.1 0
0 0
0 0
1 0
0 0
1 0.2 5
1 0
0 5
17 1
0 0
17 03 21 1
0 0
21 106 3
0 1
105 0.4 89 0
0 0
89 381 5
2 2
379 0.5 141 0
0 1
140 508 8
3 5
503 0.6 145 3
1 3
142 548 9
5 9
539 0.7 144 3
1 1
143 528 10 4
9 519 0.8 136 2
1 2
134 514 9
2 7
507 0.9 til 1
0 1
110 431 6
4 5
426 I
88 0
0 1
87 336 5
2 5
331 1.1 63 3
3 0
63 262 45 29 I
261 1.2 36 7
6 0
36 180 44 24 I
179 13 36 9
8 2
34 108 32 23 2
106 1.4 19 4
2 0
19 70 26 11 1
69 13 13 10 10 0
13 51 34 23 0
51 1.6 5
5 5
0 5
23 22 17 2
21 1.7 7
7 6
0 7
21 19 14 0
21 1.8 4
4 4
0 4
18 18 14 1
17 I.9 2
2 2
0 2
7 6
5 0
7 2
I i
1 0
1 8
7 5
0 8
2.1 0
0 0
0 0
6 6
3 0
6 2.2 I
I I
O 1
2 2
2 0
2 23 0
0 0
0 0
3 3
2 1
2 2.4 I
I I
O I
I I
I O
I 2.5 0
0 0
0 0
I I
I O
I 2.7 1
1 1
0 1
2 2
1 0
2 2.8 0
0 0
0 0
1 I
I O
I 3
0 0
0 0
0 1
I I
O I
3.2 0
0 0
0 0
1 I
I I
O Total 1%9 66 53 11 1058 4I36 327 200 53 4083
>lV 189 55 50 2
187 766 271 178 10 756 BOBretFCXIJ TsNe_S4 t/llt96e Ie FM 3-6
Table 3 -2 Braidwood Unit-1 October 1995 Outage TSP ODSCC Indication Distributions for Tubes in Service During Cycle 5B Steam Generator A Steann Generator B Composite of All Four SGs Tube N
Number N
Support Ag Ag Plate Voltage Voltage Growth Voltage Voltage Growth Voltare Voltage Growth 311 504 2.64 0.74 0.12 276 2.03 0.76 0.08 2207 2.94 0.78 0.11 511 325 3.17 0.72 0.13 224 1.93 0.72 0.15 1250 3.17 0.72 0.11 711 124 1.76 0.74 0.15 37 1.63 0.70 0.13 452 2.73 0.73 0.12 BII 56 2.04 0.69 0.13 10 1
0.57 0.I7 152 2.04 0.64 0.12 9H 5
1 27 0.65 0.14 3
0.4 034 0.01 46 1.85 0.66 0.12 10H 5
0.58 0.47 0.04 1
03 030 0.04 9
0.59 0.46 0.07 1111 1
0.57 0.57 0.06 0
2 0.72 0.65 0.13 IIC 3
1.01 0.90 0.07 3
0.65 0.47 0.03 6
1.01 0.68 0.05 IOC 6
0.53 037 0 03 1
0.42 0.42 0.01 9
0.53 038 0.03 9C 1
039 039 0.08 0
1 039 039 0.08 BC 1
03 030 0.02 0
1 03 030 0.02 SC 0
1 039 039
-0.02 I
039 039
-0.02 Total 1031 556 4136 Steam Generator C Stemma Generator D Support Maxuman Average Average Maxunum Average Average Plate Voltage Voltage Grouth Voltage Voltage Growth i
311 856 2.94 0.82 0.11 571 2.64 0.77 0.11 511 397 23 0.70 0.08 304 1.84 0.73 0.10 7 11 175 2.73 0.73 0.11 116 233 0.74 0.12 81I 39 1.1 0.59 0.08 47 1.48 0.63 0.12 911 12 1.85 0.67 0.16 26 1.45 0.69 0.10 1011 0
3 0.59 0.50 0.13 II11 0
1 0.72 0.72 0.20 llc 0
0 IOC 1
0.46 0.46 0.07 1
032 032
-0.01 9C 0
0 EC 0
0 SC 0
0 Total 1480 1069
.o==
wu - -
3-7
i Table 3 - 3 Braidwood Unit-1 l
Signal Growth Statistics For Cycle 5B on an EFPY Basis l
Steam Generator A Steam Generador B Steam Generator C Steam Generator D Cumulative Vokage
" 'I
" 'I CPDF CPDF CPDF CPDF CPDF 1.7 0
0 0
0 1
0.001 0
0 1
0.0002
-1 0
0 0
0 1
0.001 0
0 1
0.0005
-0.8 0
0 0
0 0
0.001 1
0.001 1
0.0007
-0.7 0
0 0
0 0
0.001 1
0.002 1
0.0010 0.6 0
0 1
0.002 0
0.001 1
0.003 2
0.0015
-0.5 0
0 0
0.002 2
0.003 2
0.005 4
0.0024
-0.4 1
0.001 3
0.007 0
0.003 6
0.010 10 0.0048
-03 6
0.007 2
0.011 9
0.009 8
0.018 25 0.0109 0.2 18 0.024 13 0.034 33 0.031 11 0.028 75 0.0290 0.1 40 0.%3 26 0.081 84 0.088 40 0.065 190 0.0750 0
122 0.181 82 0.228 164 0.199 163 0.218 531 0.2033 0.1 200 0375 95 0399 299 0.401 230 0.433 824 0.4026
(
0.2 191 0.561 93 0.567 306 0.607 193 0.614 783 0.5919 j
03 128 0.685 85 0.719 248 0.775 125 0.731 586 0.7336 0.4 91 0.773 57 0.822 122 0.857 99 0.823 369 0.8228 0.5 69 0.840 31 0.878 68 0.903 63 0.882 231 0.8786 i
0.6 50 0.888 22 0.917 47 0.035 32 0.912 151 0.9151 I
0.7 35 0.922 12 0.939 21 0.949 20 0.931 88 0.9364 O.8 23 0.945 12 0.960 19 0.%2 20 0.949 74 0.9543 0.9 17 0.%1 4
0.968 17 0.974 12 0.%1 50 0.9664 1
10 0.971 4
0.975 11 0.981 13 0.973 38 0.9756 l
1.1 5
0.976 4
0.982 7
0.986 5
0.978 21 0.9807 i
1.2 8
0.984 2
0.986 5
0.989 6
0.983 21 0.9857 13 4
0.987 1
0.987 3
0.991 5
0.988 13 0.9889 1.4 4
0.991 1
0.989 2
0.993 3
0.991 10 0.9913 1.5 1
0.992 0
0.989 0
0.993 1
0.992 2
0.9918 1.6 1
0.993 2
0.993 4
0.995 2
0.993 9
0.9940 1.7 0
0.993 0
0.993 2
0.997 3
0.996 5
0.9952 1.8 0
0.993 1
0.995 0
0.997 1
0.997 2
0.9956 i~
1.9 2
0.995 1
0.996 0
0.997 0
0.997 3
0.9964 2
2 0.997 1
0.998 0
0.997 0
0.997 3
0.9971 2.1 1
0.998 1
1.0 0
0.997 1
0.998 3
0.9978 23 0
0.998 0
1 0.997 0
0.998 1
2.9981 2.6 0
0.998 0
1 0.998 0
0.998 1
0.9983 2.7 0
0.998 0
1 0.999 0
0.998 1
0.9985 l
2.9 0
0.998 0
0 0.999 1
0.999 1
0.9988 l
3 1
0.999 0
0 0.999 0
0.999 1
0.9990 l
3.5 0
0.999 0
1 0.999 1
1.0 2
0.9995 4.1 0
0.999 0
1 1
0 1
0.9998 4.2 1
1.0 0
0 0
1 1.0 Total 1031 556 1480 1069 4136 38 l
l GILOWTRXLS Th F3 2/5S6 5.31FW
YP F
2 2
5 9
8 0
1 6
5 6
7 8
6 2
3 E
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5 5
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4 3
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4 2
4 4
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2 3
2 3
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tw e
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7 7
8 1
4 0
5 5
0 8
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3 7
7 4
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7 2
7 8
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2 1
2 2
1 1
2 1
1 1
1 1
1 1
tn E
a taD r
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t g5 t
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8 9
0 1
3 8
7 5
8 9
8 6
3 6
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7 3
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A 5
2 2
B r
t e
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8 7
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n 2
1 2
2 2
3 r
2 2
1 r
1 1
2 r
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2 ulc G
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0 0
o 0
0 0
o 0
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0 0
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t t
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a a
a a
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s g
s g
s g
s g
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s n
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s n
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l a
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l l
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l t
l t
l t
l a
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a o
l a
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a o
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R V V o
R V V y
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R V V e
R V V c
e g
g e
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5 e
5 e
5 5
C e
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n g
5 g
5 g
5 g
5 g
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a 7
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7 7
a 7
7 l
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a 7
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t t
t t
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l l
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2 o
2 V
c V <c2 o
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r s
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t t
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E E
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Table 3-5 Braidwood Unit-1 October 1995 Outage Average Voltage Growth History Composite of All Steam Generator Data Bobbin Voltage Nunnber of Average Vokage Average Vohage Growth Average Percentage Growth Range Indications BOC Entire Cycle Per EFPY Entire Cycle Per EFPY Cycle 5B (355-935) - 0.506 EFPY Entire Voltage Range 4136 0.64 0.110 0.218 17.3 %
34.2 %
V noe <.75 Volts 2831 0.49 0.100 0.199 20.3 %
40.2%
2.75 Volts 1305 0.94 0.131 0.260 13.9 %
27.5 %
Cycle 5A (554 - 265 ) - 0.714 EFPY Entire Voltage Range 3884 0.56 0.284 0.398 51.1 %
71.6 %
V noc <.75 Volts 3085 0.46 0.25 0.35 53.8 %
75.4 %
2.75 Volts 799 0 92 0.420 0.588 45.8 %
64.1 %
Cycle 4 (1952 -384 ) - 1.147 EFPY Entire Voltage Range 2654 0.48 0.260 0.227 54.2 %
47.2 %
V soc <.75 Volts 2289 0.41 0.290 0.253 70.7%
61.7'A 2.75 Volts 365 0.92 0.130 0.113 14.1 %
12.3 %
Cycle 3 (451 -952) - 1.132 EFPY Entire Voltage Range 167 0.62 0 620 0.554 100.0 %
89.3 %
V noe <.75 Volts 145 0.43 0.650 0.580 151.2 %
135.0 %
2.75 Volts 22 0.92 0.420 0.375 45.7%
40.8%
I caowm narr.t*>.sams* m 3-10
i l
Table 3 - 6 Braidwood Unit-1 October 1995 Summary of Largest Voltage Growth Rates for BOC-5B to EOC-5B Steam Generator Bobbin Voltage SG Row Col Elevation EOC-58 BOC-5B Growth Confirmed ?
Indication ?
A 4
71 3H 2.45 0.36 2.09 Yes Yes C
13 73 3H 2.94 1
1.94 Yes Yes D
15 7
3H 2.64 0.88 1.76 Yes Yes C
20 55 7H 2.73 0.99 1.74 Yes Yes A
20 65 SH 1.78 0.27 1.51 Yes Yes D
25 67 7H 2.33 0.91 1.42 Yes Yes C
16 46 3H 2.29 0.95 1.34 Yes Yes C
11 108 7H 2.19 0.92 1.27 Yes Yes C
22 34 3H 2.05 0.9 1.15 Yes Yes A
5 64 3H 1.98 0.92 1.06 NT' No D
13 102 7H 1.89 0.85 1.04 Yes Yes B
18 102 5H 1.17 0.14 1.03 Yes Yes B
15 44 3H 1.99 0.98 1.01 Yes Yes Not RPC tested e
GROWTH.XLS Table 34 2/5/96 5:36 PM 3-11
Tchle 3 -7 Braidwood Unit-1 Signal Growth Statistics (on an EFPY Basis) Assumed for Lirniting Case Projections Cycle 5B Cycle SA Steam Generator A Steam Generator C Hybrid' Deka CPDF CPDF CPDF
-1.7 0
1 0.001 0
-1 0
1 0.001 0
-0.8 0
0 0.001 0
0.7 0
0 0.001 0
-0.6 0
0 0.001 0
-0.5 0
2 0.003 0
-0.4 1
0 001 0
0.003 2
0.0019
-0.3 6
0.007 9
0.009 6
0.0077
-0.2 18 0.024 33 0.031 11 0.0183
-0.1 40 0.063 84 0.088 48 0.0644 0
122 0.181 164 0.199 144 0.2029 0.1 200 0.375 299 0.401 138 0.3356 0.2 191 0.561 3%
0.607 156 0.4856 0.3 128 0.685 248 0.775 107 0.5885 0.4 91 0.773 122 0.857 92 0.6769 0.5 69 0.840 68 0.903 72 0.7462 0.6 50 0.888 47 0.935 48 0.7923 0.7 35 0.922 21 0.949 48 0.8385 0.8 23 0.945 19 0.962 39 0.8760 0.9 17 0.%1 17 0.974 17 0.8923 1
10 0.971 11 0.981 18 0.9096 1.1 5
0.976 7
0.986 21 0.9298 1.2 8
0.984 5
0.989 13 0.9423 1.3 4
0.987 3
0.991 11 0.9529 1.4 4
0.991 2
0.993 9
0.% 15 1.5 1
0.992 0
0.993 7
0.% 83 1.6 1
0.993 4
0.995 4
0.9721 1.7 0
0.993 2
0.997 5
0.9769 1.8 0
0.993 0
0.997 0
0.9769 1.9 2
0.99$
0 0.997 6
0.9827 2
2 0.997 0
0.997 1
0.9837 2.1 1
0.998 0
0.997 4
0.9875 2.2 0
0.998 0
0.997 0
0.9875 2.3 0
0.998 1
0.997 1
0.9885 2.4 0
0.998 0
0.997 3
0.9913 2.5 0
0.998 0
0.997 1
0.9923 2.6 0
0.998 1
0.998 0
0.9923 2.7 0
0.998 1
0.999 1
0.9933 2.8 0
0.998 0
0.999 0
0.9933 2.9 0
0.998 0
0.999 0
0.9933 3
1 0.999 0
0.999 2
0.9952 3.1 0
0.999 0
0.999 0
0.9952 32 0
0.999 0
0.999 1
0.9962 3.4 0
0.999 0
0.999 1
0.9971 3.5 0
0.999 1
0.999 0
0.9971 3.7 0
0.999 0
0.999 1
0.9981 4.1 0
0.999 1
1.0 1
0.9990 4.2 1
1.0 0
1 0.9990 5.7 0
0 1
1.0 Total 1031 1480 1041
- Cycle 5A steam generator A &stnbuuan plus the largest growth for steam Senerator C. lius hybnd growth &stribuuan was also used to project EOC-5B voltage estnbuuan Armg the last (EOC-5A) outage l
3-12 GROWUtXL3 Table 3-7 2'5/96 5.36 PM
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1 1
1 1
1 1
1 1
2 2
2 2
2 2
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Figure 3 - 2 Braidwood Unit-1 October 1995 Outage Bobbin Voltage Distribution for Tubes Plugged After Cycle SB Service 6
5 ESG-A OSG-B I
B
-j BSG-C i
l g3 MSG-D 5
i i
2-
~ '
3
[
i h
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0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
1.1 1.2 1.3 1.4 1.6 1.8 2.3 3.2 Bobbin Voltage a m unrc r.sr. 32 3-14
Figure 3 - 3 Braidwood Unit -1 October 1995 Outage Bobbin Voltage Distributions for Tubes Returned to Service for Cycle 6 220 200-180-BSG-A 160-l l140 OSG-B a
S
'j 120 -
i
- -=
S SG -C 5
g 100 l-j
~
ESG-D
- $ 80 l
60 -
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=
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l- -: -: -
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 2.12.22.32.42.52.72.8 3 Bobbin Voltage BOBNRPCESFg 3-3 3-15
l l
Figure 3 - 4 Braidwood Unit-1 October 1995 Outage ODSCC Axial Distributions for Tubes in Service During Cycle SB 900 800 700 I
g 600 5
OSG-A j
500 GSG-B j
400 ---
E ESG-C A
300-ESG-D 200 --
100 ---
M
-i-i
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8 W
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j 4.0 Database Applied for IPC Correlations The database used for the IPC correlations that are applied in the analyses of this report are an updated version of the IPC database described in Reference 8.3.
Model Boiler specimen 598-1 is excluded from the IPC database based on 1
application of EPRI data exclusion criterion for very high voltage indications and concurrence by the NRC.
Braidwood-1 and Byron-1 pulled tube indications R16C42, TSP 5 (0.28 volt) and R2007, TSP 7 (0.38 volt), respectively, are excluded from the correlation based on EPRI data exclusion criterion 2a accepted by the NRC. Criterion 2a excludes indications with burst pressures high on the voltage j
correlation if the maximum crack depth is less than 60% and there are less than 2 remaining uncorroded ligaments. Plant S pulled tube indication R28C41 is included in the leak rate correlation at a SLB leak rate of 24961ph consistent with NRC recommendations.
Recently, South Texas pulled tube data have been added to that IPC database per NRC request. The updated database is in compliance with NRC guidelines for application ofleak rate vs voltage correlations and for removal of data outliers in the 3/4 inch tubing burst and leak rate correlations. The updated IPC database I
was used to perform the SLB leak rate and tube burst probability analyses reported here.
a:\\apc\\cce95b\\cy6_90 day.wp5 4-1
!Y
5.0 SLB Analysis Methods Monte Carlo analyses are used to calculate the SLB leak rates and tube burst probabilities for both actual EOC-5B and projected EOC-6 voltage distributions.
The Monte Carlo analyses account for parameter uncertainty and they are consistent with the Braidwood Unit-1 SER. The analysis methodology is described in Braidwood-1 specific document Reference 8.1 as well as in the Westinghouse generic methods report of Reference 8.2.
In general, Monte Carlo analyses include POD adjustments, voltage growth and NDE uncertainties in the projected analyses for the next operating cycle while only NDE uncertaint?es are included in the analyses based on the actual measured voltage distribution (for the cycle just completed). 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 satisfied and the correlation is applied for the leak rate analyses of this report.
Two sets of evaluations were performed for this outage evaluation - the first set for the Return-to-Power (RTP) evaluation in November 1995 (Reference 8.7) and the second set for this 90 Day evaluation. To apply the recently NRC approved 3 volt IPC for Braidwood Unit-1 Cycle 6 operation, tube support plates (TSP) are locked by performing tube expansion on the hot leg side during the recent outage.
Therefore, SLB leak rates and tube burst probabilities for the 90 day report were calculated considering the locked TSP condition. With TSP's locked by tube expansion, indications in the hot leg side are restrained from bursting so the burst probability calculations are based only on indications found on the cold side. Since only a small fraction of the indication population are on the cold leg side, the burst probability is expected to be substantially smaller than estimated with the usual IPC/APC methodology (which includes the entire indication population). SLB leak rates and tube burst probabilities for the RTP report were calculated considering conditions both before and after TSP locking, although the analysis without TSP locking assumption is the reference analysis since a 1 volt IPC applied to Cycle 5B operation. Comparisons of the leak rates and tube burst probabilities calculated by both methods using the actual voltage distributions are made with the corresponding prior projections for EOC-5B.
s:\\apc\\cce95b\\cy6_90 day.wp5 51
6.0 Bobbin Voltage Distributions This section describes salient input data used to calculate EOC bobbin voltage distributions and presents the results of calculations to project EOC-6 voltage distributions. Also, EOC 5B voltage distributions projected during the last (EOC-5A) inspection are compared with the actual bobbin distributions from the current inspection.
6.1 Calculation of Voltage Distributions The analysis for EOC voltage distribution starts with a cycle initial voltage distribution which is projected to the corresponding cycle Snal distribution based on the growth rate and the anticipated cycle operating period. The number of indications assumed in the analysis to project EOC voltage distributions, and to perform tube leak rate and burst probability analyses, is obtained by adjusting the number ofindications measured to account for measurement uncertainty and birth of new indications over the projection period. This is accomplished by using a Probability of Detection (POD) factor, which is defined as the ratio of the actual number of indications detected to total number of indications present.
A conservative value is assigned to POD based on the historic data, and the value used herein is discussed in Section 6-2. The calculation of projected bobbin voltage frequency distribution is based on a net total number ofindications returned to service, defined as:
Nrot ars = N / POD. N,,,&,4
+ N a,io,,,a i
- where, Number of bobbin indications being returned to service for the Nro,373 =
next cycle N
Number of bobbin indications (in tubes in service) identified
=
i after the previous cycle Probability of detection POD
=
Number of N which are repaired (plugged) after the last cycle N,,,,,a
=
i Na.,io,,,a = Number of N which are deplugged after the last cycle and are i
returned to service in accordance with IPC applicability.
There are no deplugged tubes returned to service at BOC 6.
The methodology used in the projection of bobbin voltage frequency predictions is described in Reference 8.2, and it is essentially the same as that used in performing predictions during the last two inspections. Salient input data used for projecting EOC-6 bobbin voltage frequency are further discussed below.
s:\\apc\\cce95b\\cy6_90 day.wp5 6-1 l
6.2 Probability of Detedian (POD)
The Generic Letter 95-05 (Reference 8.4) requires the application of a constant POD value of 0.6 to define the BOC distribution for the EOC voltage projections, unless an alternate POD is approved by the NRC. A POD value of 1.0 represents the ideal situation where all indications are detected.
6.3 Limiting Growth Rate Distribution As discussed in Section 3.2, the NRC guidelines in Generic Letter 95 05 stipulate that the more conservative growth rate distributions from the past two inspections should be utilized for projecting EOC distributions for the next cycle. Since growth rates for Cycle 5A are higher than those of Cycle 5B, Cycle 5A growth rates are used to develop the EOC-6 predictions. The actual growth distribution used for EOC-6 projections is a worst case hybrid growth distribution which envelopes the highest average growth as well as the highest growth increment during Cycle 5A.
This limiting growth distribution was developed during the last inspection for projecting EOC distributions for Cycle 5B.
The same conservative growth distribution was imposed on all four steam generators to provide a conservative basis for predicting EOC 6 performance.
6.4 Cyde Operating Period Tbe operating periods used in the growth rate /EFPY calculations and voltage projections are:
Cycle 5A -
BOC-5 to MOC 260.68 EFPD or 0.714 EFPY (actual)
Cycle 5B -
MOC-5 to EOC 184.81 EFPD or 0.506 EFPY (actual)
Cycle 6 BOC-6 to EOC 6 - 493.1 EFPD or 1.35 EFPY(estimated) 6.5 Projeded EOC-6 Voltage Distribution Calculation of the predicted EOC-6 bobbin voltage distributions was performed for all four SGs based on the EOC-5B distributions shown in Table 6-1. The bobbin voltage distributions are shown separately for hot leg and cold leg indications in Table 61 since tube burst analyses need only be performed for the cold leg indications (TSPs constrain rupture of hot leg indications due to tube expansion).
The beginning of cycle distributions were adjusted to account for probability of detection as described above, and the adjusted number ofindications at the BOC-6 are also shown in Table 6-1. Calculations were performed using a constant POD of 0.6. A hybrid growth distribution based on Cycle 5A growth data, shown in Table 3-8, was used. The IPC voltage distributions projected for EOC-6 for all four s:\\apc\\cce95b\\cy6_90 day.wp5 62
SGs are summarized on Table 6-2. These results are shown graphically on Figures 61 and 6-2. Since SG C has the largest number ofindications, it is predicted to be the limiting SG for leak.
6.6 Comparison of Actual and Projected EOC 5B Voltage Distributions Table 6 3 and Figures 6-5 and 6-6 provide a comparison of the EOC-5B bobbin voltage distributions obtained during the recent inspection with the corresponding predictions performed during the last (EOC-5B) inspection using a constant POD of 0.6. As reported in Reference 8-5, SG C was projected to be the limiting SG.
A comparison of the actual and projected voltage distributions indicate tha' the indication population above 1 volt is substantially overestimated in the earlier projections. The primary cause for this overprediction is the use of a constant POD value of 0.6 for the entire voltage range. This POD value is conservative for voltages above about I volt but non conservative below 1 volt. Also, utilization of a conservative growth rate distribution that bounds the highest average voltage growth observed as well as the largest voltage growth, which occurred in different SGs, contributed to the observed conservatism for voltages above 1 volt.
i s:\\apcNece95b\\cy6_90 day.wp5 6-3
Table 6 -1 (Sheet 1 ef 2)
Braidwood Unit-1 Octobei 1995 Actual EOC-58 and Assumed BOC4 VeItage Distributions Used in SLB Leak Rate and Tube Burst Probability Analyses Steam Generator A Steam Generator B velenge EOC48 DOC 4 EOC48 BOC4 e6e in service nepewed Poo e o.s in service nepewed Poo e o.s Het Cold Het Cold Het Cold Het Cold Het Cold Het Cold Side Side side Side Side Side Side Side Side Side side Side 0.1 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 0.2 3
0 0
0 5.00 0.00 2
0 0
0 3.33 0.00 0.3 47 3
0 0
78.33 5.00 10 0
0 0
16.67 0.00 j
0.4 102 3
1 0
160.00 5 00 62 3
0 0
103.33 5.00 0.5 138 1
3 0
227.00 1.67 59 1
0 0
98.33 1.67 0.6 143 1
3 0
235.33 1.67 95 0
0 0
158.33 0.00 0.7 117 0
5 0
190.00 0.00 67 1
0 0
111.67 1.67 0.8
- 14 1
1 0
180.00 1.67 63 0
1 0
104.00 0.00 0.9 104 0
2 0
171.33 0.00 52 0
0 0
86.67 0.00 1
85 1
2 0
106.33 1.67 53 0
0 0
88.33 0.00 1.1 86 1
1 0
100.00 1.67 25 0
0 0
41.67 0.00 1.2 45 0
0 0
75.00 0.00 28 0
0 0
46.67 0.00 1.3 24 0
0 0
40.00 0.00 12 0
0 0
20.00 0.00 1.4 16 0
0 0
26.67 0.00 7
0 0
0 11.67 0.00 1.5 8
0 0
0 13.33 0.00 5
0 0
0 8.33 0.00 1.6 8
0 1
0 12.33 0.00 2
0 1
0 2.33 0.00 1.7 4
0 0
0 6.67 0.00 3
0 0
0 5.00 0.00 1.8 7
0 1
0 10.67 0.00 2
0 0
0 3.33 0.00 1.9 1
0 0
0 1.67 0.00 0
0 0
0 0.00 0.00 2
3 0
0 0
5.00 0.00 3
0 0
0 5.00 0.00 2.1 2
0 0
0 3.33 0.00 1
0 0
0 1.67 0.00 2.2 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 2.3 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 2.4 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 2.5 1
0 0
0 1.67 0.00 0
0 0
0 0.00 0.00 2.6 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 2.7 1
0 0
0 1.67 0.00 0
0 0
0 0.00 0.00 2.8 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 2.9 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 3
0 0
0 0
0.00 0.00 0
0 0
0 0.00 0.00 3.1 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 3.2 1
0 1
0 0.67 0.00 0
0 0
0 0.00 0.00 3.3 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 3.4 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 Togel 1020 11 21 0
1679 18.33 551 5
2 0
916.33 8.33
- IV 187 1
4 0
307.67 1.67 88 0
1 0
145.67 0.00
- 2V 5
0 1
0 7.33 0
1 0
0 0
1.67 0.00 6-4
Table 6 - 1 (Sheet 2 of 2)
Braidwood Unit 1 October 1995 Actual EOC-58 and Assumed BOC-6 Voltage Distributions Used in SLB Leak Rate and Tube Burst Probability Analyses Steam Generator C Steam Generator D vestee.
Boc45 noc4 soc 4s soc.6 sie in service Repewed Poo e 0.s in savice Repoked pod e 0.s Het Cold Het Cold Het Cold Met Cold Hot Cold Het Cold Side Side Side Side Side Side Side Side Side Side Side Side 0.1 1
0 0
0 1.67 0.00 0
0 0
0 0.00 0.00 0.2 7
0 0
0 11.67 0.00 5
0 0
0 8.33 0.00 0.3 25 0
1 0
40.67 0.00 21 0
0 0
35.00 0.00 0.4 122 0
1 0
202.33 0.00 88 1
0 0
146.67 1.67 0.5 167 1
1 0
277.33 1.67 141 0
1 0
234.00 0.00 0.6 164 0
3 0
270.33 0.00 146 0
3 0
238.67 0.00 0.7 199 0
3 0
328.67 0.00 144 0
1 0
239.00 0.00 0.8 200 0
3 0
330.33 0.00 136 0
2 0
224.67 0.00 0.9 164 0
2 0
271.33 0.00 111 0
1 0
184.00 0.00 1
120 0
2 0
213.00 0.00 88 0
1 0
146.67 0.00 l
1.1 107 0
0 0
178.33 0.00 63 0
0 0
105.00 0.00 1.2 71 0
1 0
117.33 0.00 36 0
0 0
00.00 0.00 1.3 36 0
0 0
60.00 0.00 36 0
2 0
58DO 0.00 1.4 28 0
1 0
46.67 0.00 19 0
0 0
31.67 0.00 1.5 25 0
0 0
41.67 0.00 13 0
0 0
21.67 0.00 1.6 8
0 0
0 13.33 0.00 B
0 0
0 8.33 0.00 1.7 7
0 0
0 11.67 0.00 7
0 0
0 11.67 0.00 1.8 6
0 0
0 8.33 0.00 4
0 0
0 6.67 0.00 l
1.9 4
0 0
0 6.67 0.00 2
0 0
0 3.33 0.00 2
1 0
0 0
1.67 0.00 1
0 0
0 1.67 0.00 2.1 3
0 0
0 6.00 0.00 0
0 0
0 0.00 0.00 2.2 1
0 0
0 1.67 0.00 1
0 0
0 1.67 0.00 2.3 3
0 1
0 4.00 0.00 0
0 0
0 0.00 0.00 2.4 0
0 0
0 0.00 0.00 1
0 0
0 1.67 0.00 2.5 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 2.6 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 2.7 0
0 0
0 0.00 0.00 1
0 0
0 1.67 0.00 l
2.8 1
0 0
0 1.67 0.00 0
0 0
0 0.00 0.00 l
2.9 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 3
1 0
0 0
1.67 0.00 0
0 0
0 0.00 0.00 3.1 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 3.2 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 3.3 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 3.4 0
0 0
0 0.00 0.00 0
0 0
0 0.00 0.00 Total 1479 1
19 0
2446.00 1.67 1066 1
11 0
1769.00 1.67 I
- 1V 301 0
3 0
496.67 0.00 189 0
2 0
313.00 0.00
- 2V O
O O
O 0.00 0.00 0
0 0
0 0.00 0.00 6-5 l
l
i
~
l l
Table 6 - 2 (Sheet 1 of 2) l Braidwood Unit-1 October 1995 Voltage Distribution Projection for EOC - 6 Steam Steam Steam Steam Generator A Generator B Generator C Generator D Voltage Bin l
Projected Number ofIndications at EOC 6, POD = 0.6 l
l 0.1 0.05 0.03 0.52 0.08 0.2 2.88 1.09 3.61 2.58 0.3 23.01 7.29 16.37 12.87 0.4 53.01 26.76 55.95 42.84 0.5 83.43 41.62 93.76 76.29 0.6 105.44 58.25 126.45 103.00 0.7 118.82 66.52 158.19 123.22 i
0.8 127.46 70.95 180.29 135.60 0.9 129.68 72.64 190.45 140.29 l
1.0 126.31 71.25 190.81 136.84 1.1 119.05 66.84 181.52 128.45 1.2 109.10 60.92 167.07 117.09 1.3 97.99 54.33 150.63 105.22 1.4 86.10 47.67 133.48 93.54 l
1.5 74.21 40.94 116.21 80.99 1.6 63.33 34.71 99.20 69.13 1.7 54.01 29.27 84.89 58.73 1.8 46.30 24.86 72.20 50.03 1.9 39.64 21.35 61.31 42.60 2.0 33.78 18.96 52.00 36.13 2.1 28.93 15.53 44.24 30.70 2.2 24.70 13.26 37.91 26.27 2.3 20.90 11.32 32.40 22.43 2.4 17.64 9.58 27.47 18.97 2.5 14.98 8.05 23.40 16.04 2.6 12.73 7.13 19.87 13.59 2.7 11.53 5.77 16.84 11.48 2.8 9.18 4.85 14.19 9.73 2.9 7.78 4.12 12.08 8.22 3.0 6.59 3.45 10.19 6.92 3.1 5.69 2.96 8.76 5.94 3.2 4.92 2.56 7.61 5.18 3.3 4.21 2.20 6.50 4.43 3.4 3.86 1.86 5.51 3.75 3.5 3.05 1.57 4.76 3.19 4.' 8 2.80 3.6 2.69 1.38 1
3.7 2.38 1.22 3.62 2.45 3.8 2.04 1.06 3.12 2.11 3.9 1.76 0.91 2.70 1.83 4.0 1.52 0.78 2.34 1.59 4.1 1.33 0.68 2.05 1.40 4.2 1.20 0.61 1.81 1.25 4.3 1.09 0.57 1.64 1.12 4.4 1.01 0.52 1.50 1.03 4
4.5 0.92 0.49 1.37 0.97 Continued on next page
==2mwam:o-as'= "
6-6
i l
l l
Table 6 - 2 (Sheet 2 of 2)
Braidwood Unit-1 October 1995 Voltage Distribution Projection for EOC - 6 Steam Steam Steam Steam Generator A Generator B Generator C Generator D Voltage Bin Projected Number ofIndications at EOC 4, POD = 0.6 4.6 0.85 0.45 1.26 0.88 4.7 0.79 0.41 1.19 0.85 4.8 0.76 0.40 1.13 0.79 4.9 0.73 0.39 1.08 0.77 5.0 0.68 0.36 1.02 0.72 5.1 0.63 0.34 0.S4 0.66 5.2 0.59 0.32 0.88 0.62 l
5.3 0.55 0.29 0.83 0.58 5.4 0.50 0.27 0.77 0.53 5.5 0.46 0.25 0.68 0.49 5.6 0.42 0.23 0.62 0.44 5.7 0.37 0.21 0.58 0.41 l
5.8 0.34 0.18 0.52 0.36 5.9 0.32 0.17 0.47 0.33 l
6.0 0.29 0.16 0.44 0.31 l
6.1 0.26 0.15 0.40 0.28 6.2 0.23 0.13 0.35 0.25 6.3 0.21 0.11 0.32 0.22 6.4 0.18 0.09 0.28 0.19 l
6.5 0.15 0.04 0.24 0.16 6.6 0.14 0
0.21 0.14 6.7 0.12 0
0.18 0.13 6.8 0.11 0
0.16 0.12 6.9 0.10 0
0.15 0.11 f
7.0 0.09 0
0.14 0.10 7.1 0.10 0.70 0.13 0.10 7.2 0.09 0
0.13 0.09 7.3 0.03 0
0.12 0.09 7.4 0
0 0.13 0.02 7.5 0
0 0.13 0
l l
7.6 0
0 0.12 0
7.7 0.70 0
0.07 0
7.8 0
0 0
0.70 j
7.9 0
0.30 0
0 8.0 0
0.70 0
8.1 0
0 0
j l
8.2 0.30 0
0 i
8.3 0
0.30 8.4 0.30 TOTAL 1697.32 924.63 2447.64 1770.65
>1V 927.23 508.23 1431.24 997.04 I
> 3V 48.76 25.32 74.14 50.78 l
l l
l 6-7 24962.56 PMPREDCOMP.XLSTanos 64 I
Table 6 - 3 Braidwood Unit-1 October 1995 Comparison of Predicted and Actual EOC-6B Voltage Distributions l
Steam Generator A Steam Generator B Steam Generator C Steam Generator D EOC-5B Actual EOC-58 Actual EOC-58 Actual EOC-5B Actual P
p pg l.
Bin POD =.6 POD =.6 POD =.6 POD =.6 No. of No. of No. of No. of No. of No. of No. of No. of l
Indications indications indications indications Indications indications indications indications 0.1 0.01 0
0.00 0
0.01 1
0.01 0
0.2 1.60 3
0.45 2
1.00 7
0 80 5
0.3 15.51 50 6.18 10 11.05 25 7.93 21 l
0.4 47.44 105 23.25 65 44.09 122 31.60 89 0.5 89.70 139 44.38 60 99 06 168 66.00 141 0.6 125.82 144 61.99 95 153.52 164 101.19 145 0.7 150.71 117 70.32 68 193.85 199 128.96 144 08 161.67 115 70.48 63 222.59 200 144.01 136 0.9 158.20 104 67.70 52 237.41 164 145.53 111 1.0 140.25 66 62.47 53 229.15 129 138.07 88 1.1 114.17 67 53.18 25 197.00 107 121.13 63 1.2 89.22 45 41.79 28 155 91 71 96.54 36 1.3 68.73 24 31.71 12 119.68 36 72.39 36 1.4 52.44 16 23.67 7
91.21 28 53.37 19 1
l 1.5 39 88 8
17.45 5
69.28 25 39.46 13 l
1.6 30.43 8
12.82 2
52.64 8
29.33 5
1 l
1.7 23 ~48 4
9.55 3
39.67 7
21.66 7
l 1.8 16.05 7
7.25 2
29.95 5
15.88 4
l 1.9 14.17 1
0.00 0
22.95 4
11.87 2
2.0 11.36 3
4.24 3
17.75 1
9.25 1
1 2.1 9.20 2
3.25 1
13.57 3
7.34 0
2.2 7.38 0
2.45 0
10.29 1
5.67 1
2.3 5.87 0
1.80 0
7.78 3
4.26 0
2.4 4.64 0
1.27 0
5.95 0
3.16 1
2.5 3.69 1
0.90 0
4.65 0
2.38 0
2.6 2.96 0
0.64 0
3.73 0
1.85 0
l 2.7 2.39 1
0.46 0
3.10 0
1.49 1
2.8 0.00 0
0.34 0
2.63 1
1.22 0
2.9 1.60 0
0.79 0
0.00 0
1.02 0
30 1.32 0
0.00 0
1.84 1
0.89 0
l 3.1 1.11 0
0.00 0
1.50 0
0.76 0
3.2 0.96 1
0.00 0
1.20 0
0.00 1
3.3 0.87 0
0.00 0
0.95 0
0.59 (i
I 3.4 0.80 0
0.00 0
0.77 0
0.52
')
3.5 0.72 0
0.70 0
0.62 0
0.86 0
3.6 0.60 0
0.00 0
0.50 0
0.00 0
F 3.7 0.49 0
0.30 0
0.40 0
0.00 0
5 3.8 0.71 0
0 0.83 0
0.00 0
l 3.9 0.00 0
O 0.00 0
0.70 0
I.
4.0 0.00 0
0 0.00 0
0.00 0
4.1 0.00 0
0 0.00 0
0.30 0
4.3 0.70 0
0 0.00 0
0 4.5 0.30 0
0 0.00 0
0 5.3 0
0 0.70 0
0 5.6 0
0 0.30 0
0 TOTAL 1399.05 1031 621 78 556 2049.08 1480 1267.99 1069
> 1.0 V 508.14 188 214.56 88 857.35 301 503.89 189
>3V 7.26 1
1.00 0
7.77 0
3.73 0
4 PEDCoMP.RS PRE DCOMP.RS 2K46 2.24 PM Q.8
l 1
Figure 6-1 Braidwood Unit-1 October 1995 Predicted Bobbin Voltage Distribution for Cycle 6, POD = 0.6 Steam Generator A 250 200 O Actual BOC4 m Predicted EOC4 1
100 ta so i
!Mllten.........
l l l
o Bobbinvon ee Steam Generator B 160 1
140 l
120 0 Actual BOC4 100-a Predicted EOC4 80 l
i 1
60 -~
f
.0 _
j l
20 -
h I
l 1
lllitaan......._.
o
- I i
=
- *
- a " - * : : : :: : : : : : : : : : : : : : : : : :
Bobbin Voltage l
a
.n.swimaxu rein asm 69
Figure 6-2 Braidwood Unit-1 October 1995 Predicted Bobbin Voltage Distribution for Cycle 6, POD = 0.6 l
Steam Generator C 350 300 250 0 Actual BOC4 y 200 --
e Predict.d EOC4 j
3 150--
tZ 100--
50 l l l l ' '
EE'"---
0 Bobbin voitmo.
Steam Generator D 250 200 0 Actual BOC4 l150---
- t. OOC
$ 100 E
50 --
L l l '
lIlanna....___
O Bobbin Voltage 6-10 JLBW1006M 2/6/961:57 PM
Figure 6 - 3 Braidwood Unit 1 October 1995 Bobbin Voltage Distributions for Cycle S-B Steam Generator A 1s0 160 140 O Actual EOC-58 120 a Predicted EOC-58, POD = 0.6 100 t
g e0 1
E z.
40 20
^
f II]
0
"=
sobbinvoit o.
Steam Generator B 100 90 80 0 Actual EOC-6B 70 60 2
m Predicted EOC-58, POD =0.6 I
so a
z n g
20 I
10 --.
0
'E**--^-
Bobbin Voltage 6-11 i
m oco xse m w w w u l
l
Figure 6 - 4 Braidwood Unit 1 October 1996 i'
Bobbin Voltage Distributions for Cycle S-B l
l l
Steam Generator C l
l 250 P
I l
la 2%
J DActual EOC-68 150 s Predicted EOC-68, POD =0.8 li l
llisu...._____
,d r 1 Bobbin voltage Steam Generator D 160 140
)
I 120 0 Actual EOC-68 100 f
a Predicted EOC48, POD =0.8 g 80 so I
E a
0 I
l"----
Bobbin Voltage meco x.
6 12 2"2 "
l l
7.0 SLB Leak Rate and Tube Burst Probability Analyses t
i l
This section presents results of analyses carried out to predict leak rates and tube burst probabilities for postulated SLB conditions using the actual voltage distributions from EOC-5B inspection as well as for the projected EOC-6 voltage
~
distributions. The methodology used in these analyses is described in Section 5.0.
For the TSP locked condition during Cycle 6 (to support a 3 volt IPC), analyses l.
were performed separately for the indication population on the hot leg and cold leg
)
sides of each generator since only indications on the cold leg are to be considered for tube burst probability analysis. SG C is expected to yield the limiting SLB leak rate for Cycle 6 since it had the largest number ofindications on the hot leg side, see Table 6-1, while SG A with the largest number ofindications on the cold leg i
side is expected to be limiting from the tube burst probability standpoint.
I i
7.1 Leak Rate and Tube Burst Probability for EOC-5B Analyses to calculate EOC-5B SLB leak rate and tube burst probabilities were performed using the actual bobbin voltage distributions presented in Table 3-1 (all i
indications together) and Table 6-1 (separately for hot leg and cold leg indications).
These analyses considered both conditions prior to and after TSP locking (for i
application of a 3 volt IPC).
The results of Monte Carlo calculations are summarized on Table 7-1. The free span analyses (without TSP locking) are the j
reference analyses for Cycle 5B and their results are to be compared with allowable limits. Comparison of the EOC-5B actuals with the corresponding predictions indicates that:
a)
SG C was predicted to be the most limiting steam generator for EOC-5B with the highest leak rate and tube burst probability.
l b)
SG C was also determined to have the highest leak rate and tube burst probabilities based on actual EC bobbin measurements for EOC-5B.
c)
The leak rate and tube burst probability predictions (based on projected indication population) for all four SGs are conservative compared to the l
corresponding values based on EC bobbin measurements for EOC-5B even I
for the free span conditions. Overall, the projections for all SG's are conservative by at least a factor of 4.8.
(
d)
With TSP's locked, tube burst probability decreases by more than two orders of magnitude.
In summary, the limiting free span SLB leak rate (0.07 gpm) and burst probability (6.49x104) calculated using the actual EOC-5B bobbin voltage distributions are below the corresponding projections assuming a voltage frequency based on the NRC SER endorsed probability of detection (POD) of 0.6. Also, these values are much lower 0:\\apc\\cce95b\\cy6_90 day.wp5 7-1
i than the allowable SLB leakage limit of 9.1 gpm and the NRC reporting guideline of 10 for the tube burst probability. The major impact of restraining indications on the hot leg side from bursting is to decrease tube burst probability by over two orders of magnitude.
i 7.2 Leak Rate and Tube Burst Pmbability for EOC-6 i
l Calculations to predict the performance of the limiting steam generator in Braidwood i
Unit-1 at EOC-6 conditions were carried using NRC required constant POD value of 0.6. The mothodology used in these predictions is the same as previously described for EOC-5B. Results of the EOC-6 predictions are summarized in Table 7-2. With a constant POD of 0.6, the projected limiting EOC-6 SLB leak rate is 6.99 gpm (SG C), and the limiting tube burst probability is 6.81 x 104 (SG A). Both these limiting values are projected for SG C. These values are much lower than the allowable SLB i
leakage limit for Cycle 6 of 26.8 gpm and the NRC reporting guideline of 108 for the tube burst probability.
i l
l I
l l
t le sAape\\cce95b\\cy6JKklay.wp5 7-2
l
(
Table 7-1 Braidwood Unit-1 October 1995 Outage Summary & Caladations of Tube Leak Rate and Burst Probability L
Based on EOC-5B Adual Bobbin Voltage - 250k Simulations Burst Probability SLB l
Steam Na of Max.
Leak Generator POD Indio.
Voltd*
1 Tube 2 Tubes Rate ationsm Epm l
l EOC - 5B PROJECTIONS from EOC - 5A l
A 0.6 1401 4.5 2.92x10-3 4.75x10 0.33 4
l B
0.6 627 3.7 7.81x10
< 4.0x10 0.08 4
4 4
4 C
0.6 2051 5.6 4.94x10 4.20x10 0.48 4
4 D
0.6 1269.
4.1 1.97x10 4.20x10 0.22 EOC - 5B ACTUAL (Fme Span - Without Tube Support Ntes Lo&ed) 4 4
A 1
1031 3.5 2.98x10
< 4.0x10 0.06 4
4 B
1 556 2.5 9.72x10
< 4.0x10 0.01 4
4 C
1 1480 3.4 6.49x10
< 4.0x10 0.07 4
D 1
1069 3.0 4.12x104
< 4.0x10 0.04 EOC - 5B ACTUAL (Tube Support Plates Assumed LW l
Hot Side 1
1020 3.5 Negligible
- Negligible
- 0.06 A
Cold 1
11 1.3
< 4.0x104
< 4.0x10 1.0x10 4
4 4
4 Total 1031
< 4.0x10
< 4.0x10 0.06 Hot Side 1
551 2.5 Negligible
- Negligible
- 0.02 B
Cold 1
5 0.9
< 4.0x10
< 4.0x10 1.0x10 4
4 4
4 4
Total 556
< 4.0x10
< 4.0x10 0.02 Hot Side 1
1479 3.4 Negligible
- Negligible
- 0.07 l
C Cold 1
1 0.7
< 4.0x10
< 4.0x10 4
4 1.0x104 Total 1480
< 4.0x10 8
< 4.0x10 0.07 4
f Hot Side 1
1068 3.0 Negligible
- Negligible
- 0.04 D
Cold 1
1 0.6
< 4.0x10
< 4.0x10 1.0x10 4
4 4
Total 1069
< 4.0x10~8
< 4.0x10 0.04 4
1 (1) Number of indications adjusted for POD.
(2) Voltages include NDE uncertainties from Monte Carlo analyses and exceed measured voltages.
(3) Below 10 '(Reference 8-6).
4 t
i a:\\apc\\cce95b\\cy6_90 day.wp5 7-3
i l
Table 7-2 Braidwoor' Unit-1 Odober 1995 Outage Sununary of Projected Tube leak Rate and Burst Probability for EOC 250k Simulations Burst Probability SIE Steam Na d Max.
Leak Generate POD Indio.
Volts (*
1 Tube 2 Tubes Rate ations*
gym EOC - 6 PROJECTIONS Hot Side 0.6 1679 8.2 Negligible (*
Negligible (*
5.61 A
Cold 0.6 18 3.4 6.81x10
< 4.0x10 0.02 4
4 Total 0.6 1697 6.81x10
< 4.0x10~8 5.63 4
Hot Side 0.6 916 7.9 Negligible (*
Negligible (*
2.35 B
Cold 0.6 8
2.6 2.04x10
< 4.0x10 0.005 4
4 l
Total 0.6 924 2.04x10
< 4.0x 10 '
2.36 4
Hot Side 0.6 2446 8.4 Negligible (*
Negligible (*
6.99 C
Cold 0.6 2
1.5
< 4.0x10
< 4.0x10 0.0 4
4 4
4 Total 0.6 2448
< 4.0x10
< 4.0x10 6.99 i
Hot Side 0.6 1769 8.3 Negligible (*
Negligible (*
6.2 D
Cold 0.6 18 3.4 1.07x10
< 4.0x10 0.0 4
4 l
4 Total 0.6 1787 1.07x104
< 4.0x10 6.2 (1) Number ofindications adjusted for POD.
(2) Voltages include NDE uncertainties from Monte Carlo analyses and exceed measured voltages.
(3) Below 10~2'(Reference 8-6)
P i
i a:\\apc\\cce95b\\cyG.90 day.wp5 74
8.0 Refemnces 8.1 WCAP 14047, "Braidwood Unit 1 Technical Support for Cycle 5 Steam Generator Interim Plugging Criteria", Westinghouse Nuclear Service Division.
i 8.2 WCAP 14277, "SLB Leak Rate and Tube Burst Probability Analysis Methods for ODSCC at TSP Intersections", Westinghouse Nuclear Services Division, Jan.1995.
l 8.3 Westinghouse Report SG-95 01-003, " Byron Unit-1 End-of-Cycle 6 Interim Plugging Criteria Report," Westinghouse Nuclear Service Division, June 1995.
8.4 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.
8.5 Westinghouse Report SG-95-06-005, "Braidwood Unit-1,1995 Interim Plugging Criteria 90 Day Report," Westinghouse Nuclear Service Division, June 1995.
1 l
8.6 WCAP 14273, " Technical Support for Alternate Plugging Criteria with Tube l
Expansion at Tube Support Plate Intersections for Braidwood-1 and Byron-1 l
Model D Steam Generators," Westinghouse Nuclear Service Division, February l
1995.
8.7 Westinghouse Report NSD SGD-1176, "Braidwood Unit-1, Interim Plugging Criteria Return to Power Report," Westinghouse Nuclear Service Division, l
November 1995.
I I
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