ML20129G388

Unit-1 EOC 7B Interim Plugging Criteria Rept

ML20129G388
Person / Time
Site:	Byron
Issue date:	08/31/1996
From:	WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML20129G378	List: ML20129G374 ML20129G388
References
SG-96-08-005, SG-96-8-5, NUDOCS 9610070176
Download: ML20129G388 (61)

Text

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WESTINGHOUSE PROPRIETARY CLASS 3 SG-9648-005 BYRON UNIT- 1 END-OF-CYCLE 7B INTERIM PLUGGING CRITERIA REPORT August 1996 0

Westinghouse Electric Conxration Energy Systems Business Unit Nudear Services Division P.O. Bar 158 Madison, Pennsylvania 15663-0158 9610070176 960909 4 DR ADOCK 0500

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WESTINGHOUSE PROPRIETARY CLASS 3 )

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l SG-96-08-005 l l

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1 BYRON UNIT - 1 END-OF-CYCLE 7B l 1

INTERIM PLUGGING CRITERIA REPORT l

August 1996 i

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. . . _ . . . . _ _._._._.m.= _ _ . _ . _ _ . . .

Table of Contents 4

Page No.

1.0 Introduction 1-1 2.0 Summary and Conclusions 2-1 3.0 .EOC-7B Inspection Results and Voltage Growtb Rates 3-1 3.1 EOC-7B Inspection Results 3-1 3.2 Voltage Growth Rates 3-2 3.3 NDE Uncertainties 3-3 3.4 Assessment of RPC Confirmation Rates 3-4 4.0 Database Applied for IPC Correlations 41 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 Distnbution 62 6.4 Cycle Operating Period 6-2 6.5 Projected EOC-8 Voltage Distributions 62 6.6 Comparison of Actual and Projected EOC 8 Voltage Distributions 6-3 6.7 Probe Wear criteria 64 7.0 ' . SLB Leak Rate and Tube Burst Probability Analyses 7-1 7.1 Leak Rate and Tube Burst Probability for EOC-7B 7-1 7.2 Leak Rate and Tube Burst Probability for EOC-8 7-2

, 8.0 References 8-1 l

n.\apc\cae96\EoC7B90d.wp5 i

i Byron Unit - 1 End-of-Cyde 7B  !

Interim Plugging Criteria Report 1.0 Introdudion  !

This report provides the Byron Unit I steam generator (SG) tube Eddy Current (EC) inspection results at the end of Cycle 7B* together with Steam Line Break (SLB) leak rate and tube burst probability analysis results calculated according to i NRC guidelines, to implement a 3.0 volt Interim Plugging Criteria (IPC). SLB leak rates and tube burst probabilities were calculated for end of cycle (EOC) l mnditions of both the recently completed cycle (Cycle 7B) and the ongoing cycle -

s 'ycle 8).

Analyses for Cycle 7B were carried out using the actual bobbin voltage l distributions measured during the EOC-7B outage and the results compared with  !

corresponding values from projections performed based on the last (EOC-7A)  !

inspection bobbin voltage data. These analyses were carried out considering the locked tube support plate (TSP) condition. The methodology used in these evaluations is in accordance with previously published Westinghouse reports ]

(References 8.1,8.2 and 8.6) i 1

Analyses were also performed to project leak rates and tube burst probability for postulated SLB conditions at the end of the ongoing cycle (Cycle 8) based on the l 3.0 volt repair criteria. Those analyses utilized bobbin voltage distributions measured during the recent (EOC-7B) inspection and a limiting growth rate l distribution from the last two inspections (EOC-7A and EOC-7B inspections). l An evaluation was also performed to assess the fraction of the indications that showed no degradation during the rotating pancake coil (RPC) probe inspection in

, 1995 EOC-7A inspection, were left in service at beginning of cycle 7B (BOC-7B),

and were RPC confirmed in 1996 at EOC-7B.

• Since this is the second of two inspections conducted during Cycle 7, for clarity, the cycle completed before the mid-cycle inspection is referred to as Cycle 7A and the cycle just completed as Cycle 7B.

i a:\npcNcae96\EoC7B90d.wp5 1-1

2.0 Summary and Conclusions SLB leak rate and tube burst probability analyses were performed for the actual EOC-7B EC bobbin voltage distributions as well as the projected EOC-8 bobbin voltage distributions. Results for the EOC-7B actual measured bobbin voltages are generally lower than the corresponding projections performed using the EOC-7A outage bobbin voltage data and a probability of detection of 0.6 except for SG B SLB leak rate. The highest bobbin voltage measured for SG B (after adjusted for NDE uncertainty by a Monte Carlo r hnique) is 0.5 volts higher and the SLB leak rate based on the actual voltages is 0.02 gpm higher than the projected value (0.25 gpm). The above difference in the calculated leak rate is very smallin comparison to its acceptance limit (35.7 gpm). The number ofindications detected on the cold leg side in all SGs during the EOC-7B inspection are slightly higher than those assumed in the projection analyses, and the peak voltages measured are also slightly higher. However, the cold leg indication population detected is still small 1 and, consequently, all calculated tube burst probability values are below 4 x 104 Projections performed during the last outage for EOC-7B using a constant POD of 0.6 as well as EPRI POD predicted SG-B to be the limiting SG, which is consistent with the analy ses based on EOC-7B actual measured voltages. The SLB leak rate for SG-B based on actual EOC-7B bobbin voltages is calculated to be (for the locked TSP conditien) 0.27 gpm, and the corresponding tube burst probability is below  ;

4x104. These values are much lower than the allowable Cycle 7B SLB leakage limit of 35.7 gpm and the NRC reporting guideline of 10 8 for the conditional tube burst probability.

The leak rate and tube burst probability projections at EOC conditions for the current cycle (Cycle 8) are also well within acceptable limits. Limiting SLB leak rate projected for the EOC-8 conditions (locked TSPs) using the NRC SER endorsed probability of detection of 0.6 is 19.0 gpm. This value is projected for SG-C which has the largest number ofindications and it is well below the allowable EOC-8 leakage limit of 35.7 gpm. The highest tube burst probability,9.4x104 , is predicted for SG B which has the largest number ofindications on the cold leg side

, (only cold leg indications contribute to burst) and it is also well below the NRC reporting guideline of 10' .

. Results projected for EOC-8 are significantly higher than found at the actual EOC-7B condition due to the longer operating cycle resulting in conservative growth rates used in the projections. Voltage growths during the 1.35 EFPY duration assumed for Cycle 8 were obtained by five fold extrapolation of the measured growth rates for Cycle 7B, which was a very short cycle (0.24 EFPY).

Uncertainties in the bobbin voltage measurements would exaggerate growth rates obtained with such large extrapolation. Also, the NRC requirement to adjust the number of indications upwards using a probability of detection factor of 0.6 increased conservatism in the projections.

m.\ ape \cae96\EoC 890d wp5 2-1

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A total of 5719 indications were found in the EOC-7B inspection of which 291 were inspected with a RPC probe (including a minimum of 20 % of hot leg indications 1 between 1 and 3 volts and all hot leg indications above 3 volts), and 220 were confirmed as flaws. The RPC confirmed indications included 191 above 1.0 volt.  :

SG C had the largest number among the four SGs with 2040 bobbin indications, l of which 369 were above 1.0 volt,84 of these were inspected by RPC and 76 were i confirmed as flaws. Seven indications were found above 3 volts (one each in SGs i A and C, and 5 in SG B) and they were all confirmed by RPC.

All dents over 5 volts and 20% of dents between 2.5 and 5.0 volts were RPC inspected. An ID initiated, axial indication was reported in a dent (expected to be a mechanical ding) at the edge of the sixth TSP on the cold leg side of tube R1-C74 in SG-A. The indication starts at the top of the TSP and extends upwards 0.21" outside the TSP. Its RPC voltage is 1.17 volts (115 mil pancake coil) and the bobbin voltage of the dent is 15.77 volts. There is also another dent of magnitude 7.13 volts at that intersection located entirely within TSP. No other ID indications at dented TSP intersections or circumferentialindications at the TSP intersections or indications extending outside the TSP were found in this inspection.

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1 3.0 EOC-7B Inspedian Results and Voltage Growth Rates 3.1 EOC-7B Inspedian Results According to the IPC guidance provided by the NRC Generic Letter 95-05, the end of Cycle 7B inspection of the Byron Unit 1 SGs 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 the hot leg indications with an amplitude between 1 and 3 volts, all hot leg indications with an amplitude 3 volts and above, and all cold leg indications. Seven hot leg indications had a bobbin voltage above 3 volts; they were all confirmed as flaws and plugged. The only cold leg indication with a bobbin voltage above 1 volt was not confirmed by RPC. It was also below the upper voltage limit calculated for the cold leg indications,2.56 volts, and hence it was not 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 the dented intersections with a bobbin voltage between 2.5 and 5 volts were inspected with a RPC probe. Only one flaw was reported in the augmented inspection: an ID-initiated, axial indication was found in a dent at the edge of the sixth TSP on the cold leg side of tube R1-C74 in SG-A.

The indication starts at the top of the TSP and extends upwards 0.21 inch outside the TSP. Its RPC voltage is 1.17 volts (115 mil pancake coil) and the bobbin voltage of the dent is 15.77 volts. There is also another dent of magnitude 7.13 volts at that intersection located entirely within the TSP. The 0.21 inch flaw is too small to challenge structural integrity for a free span indication. Apart from this ID indication, there was no other unexpected eddy current results in this inspection. There were no RPC circumferential indications at the TSPs, no indications (other than RI C14) extending outside the TSPs, and no RPC indications with potential ID phase angles (except for R1-C14 in SG-A). Also, no mixed residual artifact signals or signal interference from copper deposits were found during this inspection.

. l A summery of EC indications for all four SGs is shown on Table 31, which tabulater, the number of field bobbin indications, the number of those indications that were RPC inspected, the number of RPC confirmed indications, and the number ofindications removed from service due to tube repairs. The indications that remain active for Cycle 8 operation is the difference between the observed and j

the ones removed from service.

Overall, the combined data for all four SGs of Byron Unit 1 shows the following.

Out of a total of 5719 TSP indications identified during the inspection, a I total of 291 were RPC inspected.

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1 Of the 291 RPC inspected, a total of 220 were RPC confirmed.

A total of 299 indications were removed from service of which only 26 4 indications were repaired because of TSP ODSCC related causes (7 indications exceeded 3 volt IPC repair limit and the other 19 were RPC- ,

confirmed indications near the wedge locations where IPC does not apply).

No cold leg TSP ODSCC indications required repair. Consistent with the )

3 volt IPC, hot leg indications with bobbin amplitude less than or equal 3.0 l volts and cold leg indications less than or equal to I volt are not considered-  !

for removal from service, regardless of RPC data.

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A review of Table 3-1 indicates that more indications (a quantity of 1964 1 indications, with 348 above 1.0 volt) were returned to service in SG-C than the l other SGs, thereby it potentially will be the limiting SG at EOC-8 from the  :

standpoint of SLB leak rate. SG-B had the largest number of cold leg indications i found in the .EOC-7B inspection (12) and, since tube burst probability is  ;

determined by cold leg indication population only, it potentially will yield the limiting tube burst probability at EOC-8. As discussed in Section 7, the SG C i bobbin voltage distribution yielded the largest SLB leak rate projected for the i EOC-8 condition, while SG B yielded the largest tube burst probability.

A total of ten RPC probe signals from all four SGs were classified as volumetric j calls in the field inspection and the C-Scan pictures for two of them with the  ;

i largest bobbin and RPC voltages are shown here in Figures 3-1 and 3 2. RPC signals for all ten indications are consistent with those of axial indications with cellular patches and the more appropriate classification for the signals would be axial OD indication consistent with IPC application.

Figure 3-3 shows the actual bobbin voltage distribution determined from the EOC-7B EC inspection; Figure 3-4 shows the population distribution of those EOC-7B indications removed- from service due to tube repairs; Figure 3-5 shows the distribution for indications returned to service for Cycle 7B. Of the 299 indications removed from service, only 26 indications are in tubes repaired for TSP IPC-

. related issues. The rest are in tubes plugged for degradation mechanisms other than ODSCC at TSPs. Among the 26 ODSCC indications removed from service due to IPC-related issues, only three indications were above the 3 volt IPC limit.  !

- The remaining 19 indications are in tubes near the wedge supports for which the  !

TSP IPC does not apply.

The distribution of EOC 7B indications as a function of support plate location is summarized in Table 3-2 and plotted in Figure 3-6. The data show a strong 1 predisposition of ODSCC to occur in the first few hot leg TSPs (5120 out of 5593 indications occurred at the first three hot leg TSP intersections), although the mechanism extended to higher TSPs. One indication was found at the FDB (1H) a;\ ape \cae9G\EoC7B90d wp5 3-2  ;

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in SG A, and this indication was repaired. Only 31 indications were detected on the cold leg side. This distribution indicates the predominant temperature dependence of ODSCC at Byron 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 8 operation, voltage growth rates were developed from EOC-7B (April 1996) inspection data and a reevaluation of the same indications from the EOC-7A (November 1995) inspection EC signals. Table 3-3 shows the cumulative probability distribution of growth rate for each Byron Unit-1 steam generator during Cycle 7B (December '95 - April '96) on an EFPY basis, along with the corresponding Cycle 7A growth rate distributions. Out of the 5719 indications detected during the EOC 7B inspection, reevaluated EOC-7A voltages are not available for 126 indications and, therefore, growth data is presented for 5593 indications only. Cycle 7B growth data are plotted in Figure 3 7. Among the four steam generators, SG-B has a slightly larger average voltage growth during Cycle 7B, and it also has the indication with the largest voltage growth. The curve labelled ' cumulative'in Figure 3-7 represents averaged composite growth data from all four SGs.

Composite growth rates from all SGs for Cycle 7B are compared with those of Cycles 6 and 7A in Figure 3-8; the data for Cycle 7B appear to be higher than those for the two prior operating periods. However, since Cycle 7B was a very short cycle (only 87.8 EFPDs), the differences between the current and last inspection bobbin voltages were multiplied by a factor of about 4 to convert them to the growth rate / EFPY values shown in Table 3 3 and Figure 3-8. Some of the large differences noted between the EOC-7B and previous cycle growth rates are attributable to the uncertainties associated with measured bobbin voltages, which are exaggerated since voltage differences'used to compute EOC-7B growth rates are multiplied by a factor as high as 4 to convert the growth rates to an EFPY hasis. Thus, the larger EFPY growth values for Cycle 7B in Table 3-3 and Figure

, 3-7, both positive and negative values, are likely to be overestimated. Since Cycle 7B growth rates are used in the SLB leak and burst projections for Cycle 8, the projected values are considerably overestimated as discussed in Section 7.2.

Average growth rates for each SG during Cycle 7B are summarized in Table 3-4.

The average growth rates over the entire voltage range vary between 38.9% and 78.0% (of the BOC voltage) per EFPY, between SGs, with an overall average of 63.4% per EFPY. The average growth for indications greater than or equal to 0.75 volts is 54.7% per EFPY and for indications less than 0.75 volts it is 70.0% per  !

EFPY. Steam generators B and C had the highest average voltage at BOC-7B whereas SG-B had the largest average voltage growth during Cycle 7B. Steam a:\ ape \cae96\EoC7B90d.wp5 3-3

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generator D had the largest voltage growth rate during the last (EOC-7A) inspection.

l Averaged composite voltage growth data from all four steam generators for the last three operating periods are summarized in Table 3-5. Also included in Table 3-5 are growth data from EOC-4 and EOC-5 inspections, which are available only for tubes plugged during those inspections. Table 3-6 lists top 30 indications on the basis of Cycle 7B growth rates, in descending order. Eleven of those indications  ;

were RPC confirmed and the remaining nineteen were not inspected. Nine of the i 30 indications shown are new indications, and EOC 7A voltages used to estimate l growth rates for them were obtained by revaluating the last inspection data. 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 8 it is evident that growth rates for Cycle 7B are higher than those of Cycle 7A and, hence, Cycle 7B growth rates were used to develop the EOC-8 predictions. Cycle 7B growth rates for SGs B and C are slightly higher than the composite growth distribution and, per the methodology described in Reference 8.2, SG-specific growth rates are to be used for SGs B and C while the composite growth rates should be applied for SGs A and D. However, the limiting growth rate for SG B was imposed on all four steam generators to provide a conservative basis for predicting EOC-8 performance. l l

Separate voltage projections to EOC-7B are required for the hot and cold legs since  !

tube expansion to limit TSP displacement has been implemented only in the hot leg. Table 3-2 shows average and maximum growth rates by TSP elevation including the cold leg. It is seen that except one indication with 0.53 volt; growth all other growth rates for the cold leg below 0.15 volts. The cold leg results tend  !

to indicate lower growth rates than found for hot leg indications. It is therefore i very conservative to use the bounding growth rate (Cycle 7B distribution) for the cold leg as well as the hot leg indications, and this conservatism is applied for the EOC-8 analysis in Sections 6 and 7.

3.3 NDE Uncertainties  ;

The NDE uncertainties applied for the Cycle 7B voltage distributions in the Monte Carlo analyses for leak rate and burst probabilities are the same as those previously reported in the Byron Unit-1 IPC report of Reference 8.7 and NRC GL ,

95-05 (Reference 8.4). They are presented in Table 3-7 as well as graphically illustrated in Figure 3-9. The probe wear uncertainty has a standard deviation of 7.0 % about a 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 s \apc\cae96\EoC7B90d.wp5 3-4

. . . - -. - -.- . .. - .- - . - - - . - . - ~ . -

distributions are included in the Monte Carlo analyses used to project the EOC-7B voltage' distributions.

3.4 Assessment of RPC Confirmation Rates This section tracks the 1995 EOC-7A indications left in service at EOC-7B relative to RPC inspection results in 1996 at EOC-7B. The composite results for all SGs are given in Table 3-8. For 1995 bobbin indications left in service, the indications are tracked relative to 1996 RPC confirmed,1996 RPC NDD,1996 bobbin indications not RPC inspected and 1995 bobbin indications with no indication found in 1996. Also included are new 1996 indications. The table shows, for each category of indications, the number of indications RPC inspected and RPC confirmed in 1996 as well as the percentage of RPC confirmed indications.

Of the 39 RPC NDD indications left in service at BOC-7B, 33 were RPC tested during the EOC-7B inspection and only 9 were confirmed. This RPC confirmation rate for prior RPC NDD indications (27.3%)is smaller than the 48.1% value found

' during the last inspection. It has been recommended by industry that the largest RPC NDD confirmation rates over the prior two cycles be used for projections.

Thus, it would be justifiable to include only 50% of the RPC NDD indications in the BOC-8 voltage distribution used for EOC 8 projections, and leak rate and burst probability analyses. However,100% of RPC.NDD indications reported in the EOC-7B inspection are considered in the SLB leak rate and tube burst probability analyses presented in this report for EOC-8 conditions.

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. . e e Table 3-1 ( Sheet 1 of 2)

Byron Unit-1 April 1996 Outage Summary ofInspection :Ind Repair For Tubes in Service During Cycle 7B Steant Generator A Steam Generator B Secani Generator C In-Service During Cyde 7B RTS for Cyde 5 hi-Service During Cyc:e 7B RTS for Cyde B In-Service Dewing Cycle 7B RTS for Cyde 5

• N " RPC RPC Imacettene AE ' ' ' "

RFC RFC Indicamens AE RFC RPC Imeremens AE leapeded Cennrmd Repaired Inde. Imeported Comnresed Reym6 red lede. Imepeeted Comnremed Repaired Inde.

Inde. Inde. Inde.

0.1 1 0 0 0 1 I 2 0 0 0 2 2 0 0 0 0 0 0 0.2 36 2 0 0 36 34 25 0 0 0 25 25 33 0 0 32 32 1 i 0.3 125 1 0 1 124 123 135 6 2 6 129 125 171 5 0 5 166 162 0.4 160 7 2 6 154 150 235 6 2 9 226 222 257 6 1 7 250 245 0.5 146 3 I II 135 133 252 I I 11 241 241 275 3 1 7 268 266 0.6 127 7 3 10 117 113 246 2 0 8 238 236 280 6 2 7 273 270 0.7 110 3 1 8 102 100 222 6 5 14 208 208 231 5 2 13 218 217 0.8 74 I i 6 68 68 146 0 0 6 140 140 204 3 I 8 196 194 0.9 67 0 0 7 60 60 109 0 0 3 106 106 119 2 0 2 117 116 1 42 0 C 5 37 37 95 1 0 8 87 86 101 2 1 5 96 95 1.1 33 1 0 2 31 31 80 0 0 5 75 75 89 2 1 2 87 86 1.2 24 0 0 4 20 20 49 0 0 6 43 43 $7 1 0 1 56 55 1.3 20 0 0 l 19 19 59 0 0 1 58 58 66 1 0 1 65 64 1.4 15 0 0 3 12 12 31 0 0 3 28 28 41 7 5 1 40 38 O I.5 12 0 0 3 9 9 19 0 0 3 16 16 34 16 14 0 34 32 l.6 7 5 5 0 7 7 29 20 20 3 26 26 19 I4 14 0 19 19 1.7 7 7 7 0 7 7 13 10 9 I 12 11 14 6 6 0 14 14 l.8 4 4 4 0 4 4 7 6 5 I 6 5 9 8 8 3 6 6 '

l.9 6 6 5 1 5 4 7 6 5 0 7 6 11 7 7 2 9 9 2 I I I O I I 2 2 2 I I I 4 3 3 2 2 2 2.1 2 2 2 0 2 2 4 4 4 1 3 3 6 4 4 3 3 3 12 1 1 0 1 0 0 6 5 5 2 4 4 3 2 2 0 3 3 ,

13 I I I I O O 2 2 2 0 2 2 6 4 4 2 4 4 14 0 0 0 0 0 0 1 I I O 1 1 5 4 4 4 1 1 2.5 0 0 0 0 0 0 7 7 7 5 5 1 1 1 0 1 1 2.6 0 0 0 0 0 0 2 2 2 I I I I I I O I I 2.7 0 0 0 0 0 0 1 I 1 0 1 1 1 1 1 0 1 I 2.8 I i 1 1 0 0 0 0 0 0 0 0 2 1 1 0 2 2

3. 8 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 3.3 0 0 0 0 0 0 1 1 1 I O O C 0 0 0 0 0 3.4 0 0 0 0 0 0 I I I 1 0 0 0 0 0 0 0 0 3.5 1 1 1 1 0 0 l i 1 1 0 0 0 0 0 0 0 0 ,

4.5 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 Total 1023 54 35 72 951 935 1791 93 78 100 1691 1677 2040 115 84 76 1964 1938 '

> lV 135 30 27 18 117 116 324 71 68 35 289 286 369 83 76 21 348 341

>3V 1 I I I O O 5 5 5 5 0 0 0 0 0 0 0 0 sae m csi sm.me n ie=

_ . _ _ _ - _ . . . _ _ . _ _ . _ . . _ _ _ _ _ _ . . _ . _ _ . _ _ _ _ _ _ . _ _ _ m__ _ - _ . . _ _ _ . - , -.- __ -- , . . . - - , , . . , . . . - . .

Table 3-1 ( Sheet 2 of 2)

Byron Unit -1 April 1996 Outage Summary ofInspection and Repair ForTubes in Service During Cycle 7B Steam Generator D Cosnymite of AB 4 SGs In-Service During Cycle 7B RTS for Cycle 8 in-Service During Cycle 7B RTS for Cycle 8 W* " RFC RFC leerse s AE RPC aPC leaced.as AR 31 toer es.4 c ar e a.p.m a s.mese , a ar e a,p.m.e n mese O. I O O O O O O 3 0 0 0 3 3 0.2 39 1 0 1 38 37 133 3 0 2 131 128 0.3 141 3 0 2 139 136 572 15 2 14 558 546 0.4 179 1 0 9 170 170 831 20 5 31 800 787 0.5 142 2 1 4 138 137 815 9 4 33 782 777 06 97 I I 4 93 93 750 16 6 29 721 712 0.7 62 0 0 6 56 56 625 14 8 41 584 581 0.8 45 1 1 4 41 41 469 5 3 24 445 443 0.9 29 0 0 4 25 25 324 2 0 16 308 307 1 35 0 0 2 33 33 273 3 1 70 253 251 1.1 31 0 0 1 30 30 233 3 223 222 1

- 10 1.2 14 0 0 0 14 14 144 1 0 Il 133 132 1.3 13 0 0 0 13 13 158 I O 3 155 154 4 1.4 5 0 0 0 5 5 92 7 5 7 85 83 1.5 6 0 0 0 6 6 71 16 14 6 65 63 1.6 8 I I 2 6 6 63 40 40 5 58 58 l.7 4 4 4 3 I I 38 27 26 4 34 33 1.8 4 4 4 2 2 2 24 22 21 6 18 17 1.9 4 4 4 2 2 2 28 23 21 5 23 21 2 3 3 3 2 I i 10 9 9 5 5 5 2.1 0 0 0 0 0 0 12 to 10 4 8 8 2.2 I I I 0 1 I il 9 8 3 8 8 2.3 0 0 0 0 0 0 9 7 7 3 6 6 2.4 0 0 0 0 0 0 6 5 5 4 2 2 2.5 2 2 2 2 0 0 10 10 to 4 6 6 2.6 0 0 0 0 0 0 3 3 3 1 2 2 2.7 0 0 0 0 0 0 2 2 2 0 2 2 18 0 0 0 0 0 0 3 2 2 1 2 2 31 1 I I 1 0 0 2 2 2 2 0 0 3.3 0 0 0 0 0 0 I I I I O 0 3.4 0 0 0 0 0 0 1 1 1 I O O 3.5 0 0 0 0 0 0 2 2 2 2 0 0 45 0 0 0 0 0 0 1 1 I 1 0 0 Total 865 29 23 51 814 809 5719 291 220 299 5420 5359

>IV 96 20 20 15 81 81 924 204 191 89 835 824

>3V I I i 1 0 0 7 7 7 7 0 0

- i

Tabic 3-2 (Sheet 1 of 2)

Byron Unit-1 April 1996 TSP ODSCC Indication Distributions for Tubes in Service During Cycle 7B Steam Generator A Steam Generator B Steam Generator C Tube Number Number Number g Maximum Average Largest Average Maximum Average Largest Average Maximum Average Largest Average 3 d g Voltage Voltage Grom1h Orom1h Voltage Voltage Grom1h Growth Voltage Voltage Orom1h Grom1h III I 0.69 0 69 0.09 0.09 0 - - - - 0 - - - -

311 49g 3 49 0.66 1.26 0.05 989 4.45 0.79 1.86 0.14 1177 2.72 0.75 1.74 0.12 511 233 2.7% 0.64 0.57 0.06 457 2.46 0.66 0.72 0.08 610 2.36 0.67 0 $$ 0.08 7II 9

00 127 I.34 0.61 0.57 0.06 145 1.77 0.53 0.47 0.07 74 2.05 0 57 0.53 0.0t 11 52 1.s 0.56 0.55 0.04 102 2.14 0.56 0.76 0.09 92 1.6 0.53 0.5s 0.06 9II 41 1.13 0 42 0.33 0.03 33 0.94 0.46 0.21 0.02 46 0.37 0.42 0.42 0.06 1011 0.87 0.34 0.33 0.04 9 0.61 0.39 0.26 0.09 9 15 l.C2 0.46 0.3 0.03 IIII I 0.45 0.45 0.13 0.13 0 - - - - 10 0.74 0.42 0.14 0.00 llc o . - - - 4 0.66 0.50 0.36 0.0B 4 1.34 0.76 0.53 0.17 10C 3 0.54 0.39 0.12 0.05 1 0.25 0.25 0.07 0.07 0 - - - -

9C 5 0.41 0.34 0.12 0.05 0 - - - - 0 - - - -

BC 1 0.32 0.32 -0.02 -0 02 1 0.25 0.25 -0.07 -0.07 0 - - - -

7C 0 - - - - 3 0.95 0.61 0.07 0.00 0 - - - -

SC o 0 0.69 0.69

. . . - - - - - 1 0.1 0.10 2C 0 - - - - 2 0.39 0.30 0.07 0.04 0 - - - -

Total 1020 1746 2023 maarms se.aw . m m '_.w _- w _m _-. _ _ _ _ _ _ _

• _ _ _ - . _ _ - _ _ mr

. . . e Table 3-2 (Sheet 2 of 2)

Byron Unit-1 April 1996 TSP ODSCC Indication Distributions for Tubes in Service During Cycle 7B Steam Generator D Composite of All Four SGs Number Number Support g Maximum Average Largest Average Maximum Average Largest Average d

Plate g Voltage Voltage Growth Growth Voltage Voltage Growth Growth 2II O - - - - 1 0.69 0.69 0.09 0.09 311 463 3.06 0.64 0.77 0.06 3120 4.45 0.74 1.86 0.11 Sil 237 2.46 0.53 0.51 0.04 1587 2.78 0.64 0.85 0.07 _

7II 67 1.77 0.46 0.38 0.04 413 2.05 0.55 0.57 0.07

@ 811 8 0.67 0.45 0.24 0 04 254 2.14 0.55 0.76 0.07 9II 12 0.56 0.37 0.2 0.06 132 1.13 0.43 0.42 0.04 1011 6 0.37 0 28 0.05 0.00 39 1.02 0.37 0.33 0.04 1111 5 0.56 0.38 0.15 0.05 16 0.74 0.41 0.15 0.03 IIC 5 0.44 0.29 0.11 0.04 13 1.34 0.50 0.53 0.09 IOC 0 - - - - 4 0.54 0.36 0.12 0.08 9C 1 0.18 0.18 0.03 0.03 6 0.41 0.31 0.12 0.05 BC o . . . . 2 0.32 0.30 -0.02 -0.05 7C 0 - - - - 3 0.95 0.61 0.07 0.00 5C o . - - - 1 0.69 0.69 0.1 0.10 2C 0 - - - - 2 0.39 0.00 0.07 0.04 Total 804 5593 97tFFOWT MATdhS 3 des 994ElttN AM

. . .' +

Tcble 3-3 Byron Unit-1 April 1996 Signal Growth Statistics For Cycle 7B on an EFPY Basis Steam Generator A Steam Generator B Steam Generator C Steam Generator D Cumulative C)de7A Cyde 7B Cyde 7A t.yde 7B C)de7A Cyde 7B C)de 7A C)de7B C)de7A Cyde 78 CPDF CPDF CPDF CPDF CPDF CPDF CPDF CPDF CPDF CFJ

-1.6 0 0 0 0 1 0.000 1 0.001 2 0.000

-1.5 0 0 0 0 1 0.001 0 0.001 1 0.001

-1.4 0 0 0 0 1 0.001 0 0.001 1 0.001

-I.3 0 0 1 0.001 1 0.002 0 0.001 2 0.001

-1.2 1 0.001 0 0.001 2 0.003 0 0.001 3 0.002

-1.1 0 0.001 0 0.001 3 0.004 1 0.002 4 0.002

-1 0 0.001 0 0.001 3 0.006 1 0.004 4 0.003

-0.9 1 0.002 0 0.001 3 0.007 1 0.005 5 0.004

-0.8 0 0.002 0 0.001 6 0.010 2 0.007 8 0.005

-0.7 0 0.002 0 0.001 11 0.015 1 0.009 12 0.008 p -0.6 I 0.003 1 0.001 4 0.018 0 0 009 _

6 0.009

>-a -0.5 13 0.016 0 16 0.010 31 0.033 12 0 72 4 021 0 -0.4 38 0.053 0.0006 41 0.034 70 0.068 0 23 0.0002 172 0.052

-0.3 0 40 0.092 0.0012 50 0.062 0 70 0.102 0.0011 35 0.0006 195 0.087

-0.2 0.002 100 0.190 0.0050 98 0.119 0.003 120 0.162 0.0023 75 .39 0.0034 393 0.157 -

-0.1 0.018 60 0.249 0.0206 84 0.167 0.021 107 0.215 0.0158 68 0.274 0.01 % 319 0.214 0 0.081 145 0.391 0.1149 161 0.259 0.125 188 0.307 0.0948 90 0.386 0.1085 584 0.319 0.1 0.305 95 0.484 0.3702 124 0.330 0.381 123 0.368 0.3262 63 0.464 0.3536 405 0.391 0.2 0.501 100 0.582 0.5743 128 0.403 0.563 153 0.444 0.5327 67 0.547 0.5499 448 0.471 0.3 0.6 % 90 0.671 0.7291 207 0.522 0.716 185 0.535 0.6919 84 0.652 0.7123 566 0.573 0.4 0.831 56 0.725 0.8227 110 0.585 0.831 117 0.593 0.7901 54 0.719 0.8210 337 0.633 i 0.5 0.897 61 0.785 0.8752 126 0.657 0.884 130 0.657 0 8533 53 0.785 0.8781 370 0.699 0.6 0.938 37 0.822 7 0.9182 79 0.702 0.924 87 0.700 0.9120 27 0.818 0.9227 230 0.740  !

0.7 0.%1 36 0.857 0.9438 65 0.739 0.951 70 0.735 0.9402 21 0.845 0.9487 192 0.774 0.8 0.975 33 0.889 0.9563 88 0.790 0.%8 95 0.782 0.9582 39 0.893 0.% 38 255 0.820 0.9 0.988 26 0.9147 0. % 82 34 0.809 0.981 50 0.807 0.% 73 16 0.9129 0.9756 126 0.842 '

I 0.992 18 0.9324 0.9775 56 0.841 0.986 61 0.837 0.9786 19 0.9366 0.9830 154 0.870 1.1 0.992 14 0.9461 0.9850 32 0.860 0.990 45 0.859 0.9842 8 0.9465 0.9878 99 0.888 1.2 0.9% 7 0.9329 0.9875 25 0.874 0.994 32 0.875 0.9876 9 0.9577 0.9910 73 0.901 1.3 0.997 7 0.9598 C9931 40 0.897 0.997 48 0.899 0.9932 7 0.9664 0.9950 102 0.9190 1.4 0.998 11 0.9706 0.9950 19 0.9078 0.997 26 0.9115 0.9944 4 0.9714 0.9%2 60 0.9297 1.5 0.999 7 0.9775 0.9969 19 0.9187 0.998 23 0.9229 0.9955 7 0.9801 0.9974 56 0.9397 -

Table continues on next page i

. - _ - _ . . . . - _ . ~ - _ . _ _ - _ - , _ - _ - - - _ _ _ _ _ _ _ _ _ _ _ - - _ _ . _ - - - . . . - - - . ~ ~ , . - - - - ,, , ~- _ .. - . . , .

Table 3-3 (contd.)

Byron Unit-1 April 1996 Signal Growth Statistics For Cycle 7B on an EFPY Basis Steam Generator A Steam Generator B Steam Generator C Steam Generator D Cumulative Cyde7A Cyde 7B C)de 7A C)de7B C)de 7A Cyde 7B Cyde 7A Cyde7B C)de 7A Cyde7B CPDF I I CPDF CPDF CPDF CPDF CPDF CPDF CPDF CPDF CPDF '

l.6 0.999 1 0.9784 0.9 % 9 17 0 9284 0.999 18 0.9318 0.9955 2 0.9826 0.9976 38 0.9465 1.7 1.000 3 0.9814 0.9975 13 0.9359 0.999 17 0.9402 0.9955 4 0.9876 0.9980 37 0.9532 1.8 2 0.9833 0.9988 16 0.9450 0.999 20 0.9501 0.9977 4 0.9925 0.9990 42 0.9607 1.9 4 0.9873 0.9988 7 0.9490 0.999 15 0.9575 0.9977 1 0.9938 0.9990 27 0. % 55 2 2 0.9892 0.9988 13 0.9565 0.999 10 0.% 24 0.9989 0 0.9938 0.9992 25 0.9700 2.1 1 0.9902 0.9994 10 0.% 22 1.000 7 0.% 59 0.9989 0 0.9938 0.9995 18 0.9732 2.2 2 0.9922 0.9994 7 0.9662 11 0.9713 1.000 2 0.9963 0.9998 22 0.9771 2.3 3 0.9951 0.9994 9 0.9714 13 0.9778 0 0.9 % 3 0.9998 25 0.9816 2.4 2 0.9971 0.9994 4 0.9737 7 0.9812 0 0.9963 0.9998 13 0.9839 w 2.5 0 0.9971 1.000 9 0.9788 4 0.9832 0 0.9 % 3 1.000 13 0.9862

, 2.6 0 0.9971 4 0.9811 3 0.9847 0 0.9963 7 0.9875

• 2.7 0 0.9971 1 0.9817 1 0.9852 1 0.9975 3 0.9880 2.8 1 0.9980 6 0.9851 4 0.9871 1 0.9988 12 0.9902 2.9 0 0.9980 4 0.9874 1 0.9876 0 0.9988 5 0.9911 3 0 0.9980 5 0.9903 5 0.9901 0 0.9988 10 0.9928 3.1 0 0.9980 2 0.9914 1 0.9906 0 0.9988 3 0.9934 3.2 0 0.9980 3 0.9931 3 0.9921 0 0.9988 6 0.9945 3.3 0 0.9980 1 0.9937 2 0.9931 1 1.0000 4 0.9952 3.4 0 0.9980 0 0.9937 2 0.9941 0 2 0.9955 3.5 0 0.9980 0 0.9937 2 0.9951 0 2 0.9959 3.6 0 0.9980 '2 0.9948 2 0.9960 0 4 0.9966 3.8 0 0.9980 2 0.9960 0.9960 0 2 0.9970 4 0 0.9980 0 0.9960 2 0.9970 0 2 0.9973 4.5 1 0.9990 3 0.9977 1 0.9975 0 5 0.9982 5 0 0.9990 1 0.9983 1 0.9980 0 2 0.9986 5.5 1 1.0000 0 0.9983 1 0.9985 0 2 0.9989 6.5 0 1 0.9989 2 0.9995 0 3 0.9995 7 0 1 0.9994 0 0.9995 0 1 0.99 %

7.5 0 0 0.9994 1 1.0000 0 1 0.9998 8 0 1 1.0000 0 0 1 1.0000 Total 1020 1746 2023 804 5593 BYREPORT.X1.S Table 3 3(2) 89961018 AM

Table 3-4 Byron Unit-1 April 1996 Outage Average Voltage Growth During Cycle 7B Voltage Number of Average Voltage Range ImHeations BOC Entire Cycle Per EFPY

• Entire Cycle Per EFPv' Compostte of AN Steam Generator Data Entire Voltage Range 5593 0.58 0.08" 0.370 15.2 % 63.4 %

V soc < .75 Volts 4229 0.44 0.073 0.306 16.8 % 70.0 %

2.75 Volts 1364 1.04 0.137 0.571 13.1% 54.7 %

Steam Generator A Entire Voltage Range 1020 0.57 0.054 0.223 9.3% 38.9 %

V noc < .75 Volts 779 0.43 0.040 0.168 9.4 % 39.2%

93 2.75 Volts 24I 1.04 0.096 0.402 9.3 % 38.6 %

Steam Generator B Entire Voltage Range '746 0.60 0.112 0.468 18.7 % 78.0 %

V soc < .75 Volts 1299 0.45 0.091 0.379 20.3 % 84.5 %

2.75 Volts 447 1.04 0.175 0.728 16.8 % 69.8 %

Steam Generator C Entire Voltage Range 2023 0.60 0.101 0.421 l 16.9% 70.3 %

V soc < .75 Volts 1498 0.45 0.086 's.%0 19.3 % 80.3 %

2.75 Volts 525 1.03 0.143 0.597 13.9 % 57.9 %

Steam Generate: u Entire Voltage Range 804 0.53 0.052 0.217 9.9% 41.0 %

V noc < .75 Volts 653 0.40 0.048 0.200 12.1 % 50.5 %

2.75 Volts 151 1.10 0.069 0.289 6.3% 26.3 %

Based on Cycle 7B duration of 87.7 EFPD (0.24 EFPY) i BYREPORT XLSiTaNo.3AS996it018 AM i

i

_._______m________________m.___.______mm__ . - . - _ . _ _ _ __ _ _ _ __m_ . _ _ _ _ _ - - _ _ ___m_________m - - _ _ _ _ _ _ _ - _ _ _ _ _ _ ___ _ _ _ _ _ _ _ _ _ _ _ _ _ __ __m_._-. -

Table 3-5 Byrom Unit-1 April 1996 .

Average Voltage Growth for Cycle 7B

. Counposite of AM Stease Generator Data >t i

I

! Bobbin Voltage Noseber of Average Voltage Average Voltage Growth Average mo.%,. Growth

! Range Indications BOC Entire Cycle Per EFPY - Entire Cycle Per EFPY Cycle 7B (12/95 - 4/96) - 87.7 EFPD .

Entire Voltage Range 5593 0.58 0.089 0.371 15.2 % 63.4 % i V noc < .75 Volts 4229 0.44 0.073 0.306 16.8 % 70.1 %

2.75 Volts 1364 1.04 0.137 0.571 13.1 % 54.7% -

1 Cycle 7A (1994 - 1995) - 317.4 EFPD

9)  :

U Entire Voltage Range 5005 0.49 0.204 0.235 41.9% 48.3 %

V noe < .75 Volts 4276 0.42 0.I89 0.217 45.3 % 52.1% i 2.75 Volts 729 0.90 0.298 0.343 32.9 % 37.9 % .[

i t Cycle 6 (1993 - 1994) - 466.5 EFPD .

Entire Voltage Range 2851 0.47 0.320 0.251 68.1 % 53.3%

V noe < .75 Volts 2377 0.37 0.35 0.274 94.6 % 74.1% l 2.75 Volts 474 0.99 0.I80 0.I41 18.2 % 14.2%

i Cycle 5 (1991 - 1993) - 411.6 EFPD (Plugged Tubes Only)

Entire Voltage Range 532 l 0.46 l 0.310 l - 0.275 67.4 % l 59.8 %

I Cycle 4 (1990 - 1991) - 463.9 EFPD (Plugged Tubes Only) . i i '

Entire Voltage Range 550 l 0.32 l 0.260 l 0.205 81.3 % 64.0 %

l l l

! I BYREPORTXL5iTaNe_3 5ft996l1018 AM

.. . .-- - - . - . . . _ _ . . . - - - . - - - . - . --..---_t

i l 1

1 i Table 3-6 ,

I Byron Unit-1 April 1996 l

} Summary of Largest Voltage Growth Rates for BOC-7B to EOC-7B t

1 l

Steam Generator Bobbin Voltage RPC New i

i Confirmed Indication 1 SG Row Col Elevation EOC-7B BOC-7B Growth

} ,, ,,

B 21 103 03H 3.33 1.47 1.86 Y Y  !

s -

i -

C 12 16 03H 2.38 0.64 1.74 N I* Y ,

l B 14 109 03H 3.44 1.83 1.61 Y N l

B 19 104 03H 4.45 l.5 Y N 2.95 _  !

C 24 28 03H 2.23 0.73 1.5 NI N C~ 40 79 03H 2.72 1.24 1.48 NI N l i C 38 81 03H 2.21 0.91 1.3 Y N  !

l A 13 4 03H 3.49 2.23 1.26 Y N j C 46 52 03H 1.66 0.52 1.14 NI N .

3 B 9 83 03H 2.12 1 1.12 NI Y  ;

C 20 64 03H 2.23 1.17 1.06 N1 N i B 12 23 03H 1.32 0.3 1.02 NI Y I

, B 29 48 03H 1.56 0.55 1.01 NI N A 5 41- 03H 1.84 0.85 0.99 Y N -

!' B 8 94 03H 1.69 0.7 0.99 NI N I

) C 19 88 03H 2.03 1.07 0.% NI N

C 40 34 03H 1.47 0.52 0.95 NI Y B 2 51 03H 3.29 2.39 0.9 Y N  !

j B 27 35 03H 1.87 0.97 0.9 NI Y l j B 3 58 03H 2.1 1.24 0.86 Y N  !

B 3 112 03H 1.15 0.3 0.85 NI Y I 1 C 11 56 05H 2.01 1.16 0.85 Y N i j C 36 28- 03H 1.36 0.51 0.85 NI Y

C 11 18 03H 2.14 1.31 0.83 NI N

' C 33 23 03H 1.82 1 0.82 NI N j C 14_ 72 05H 2.36 1.55 0.81 Y N 2

C 36 35 03H 1.46 0.66 0.8 NI N B 14 93 03H 1.22 0.43 0.79 NI N C 24 79 03H 1.24 0.45 0.79 NI Y C 12 69 03H 2.32 1.54 0.78 Y N

'N I = Not inspected

].

i i i I i

i onowin xts T.bic3 6 ar24s612.34 m 3-14 a

Table 3-7 Probe Wear and Analyst Variability - Tabulated Values Analyst Variability frobe Wear Variability Std. Dev = 10.3% Mean = 0.0% Std. Dev = 7.0% Mean = 0.0%

No Cutoff Cutoff at +/- 15%

Value Cumul. Prob. Value Cumul. Prob.

-40.0% 0.00005 < - 15.0% 0.00000

-38.0% 0.00011 - 15.0% 0.01606

-36.0% 0.00024 -14.0% 0.02275

-34.0% 0.00048 -13.0% 0.03165

-32.0% 0.00095 -12.0% 0.04324 .

-30.0% 0.00179 -11.0% 0.05804

-28.0% 0.00328 -10.0% 0.07656

-26.0% 0.00580 -9.0% 0.09927

-24.0% 0.00990 -8.0% 0.12655

-22.0% 0.01634 -7.0% 0.15866

[

-20.0% . 0.02608 -6.0% 0.19568

-18.0% 0.04027 -5.0% 0.23753

-16.0% 0.06016 -4.0% 0.28385

-14.0% 0.08704 -3.0% 0.33412

-12.0% 0.12200 -2.0% 0.38755

- 10.0% 0.16581 -1.0% 0.44320

-8.0% 0.21867 0.0% 0.50000

-6.0% 0.28011 1.0% 0.55680

-4.0% 0.34888 2.0% 0.61245

-2.0% 0.42302 3.0% 0.66588 0.0% 0.50000 4.0% 0.71615 2.0% 0.57698 5.0% 0.76247 4.0% 0.65112 6.0% 0.80432 6.0% 0.71989 7.0% 0.84134 8.0% 0.78133 8.0% 0.87345 10.0% 0.83419 9.0% 0.90073 12.0 % 0.87800 10.0 % 0.92344 14.0 % 0.91296 11.0% 0.94196 16.0 % 0.93984 12.0 % 0.95676 18.0 % 0.95973 13.0% 0.96835 20.0 % 0.97392 14.0 % 0.97725 22.0 % 0.98366 15.0 % 0.98394 24.0 % 0.99010 > 15.0% l.00000 26.0 % 0.99420 28.0 % 0.99672 30.0% 0.99821 l 32.0 % 0.99905 34.0 % 0.99952 36.0% 0.99976 38.0% 0.99989 40.0% 0.99995 BCINRPC.XLS Table 3-7 8/5/96 4:04 PM 3-15

Table 3-8 Byron Unit-1 Analysis of RPC Data from 1995 and 1996 Inspections Combined Data from All Four Steem Generators Total Total Total Total Percent

. 1995 1996 1996 1996 1996 Group of Indications Bobbin Bobbin RPC RPC RPC Indication Indication inspected Confirmed Confirmed Lees ttien or Equal to 1.0 Volt in 1996 15 Bobbin Left in Service 3589 3165 32 to 31.3

- 95 RPC Confirmed 8 8 2 1 50.0

- DSRPC NDD 32 32 30 9 30.0

- 95 RPC Not inspected 3125 3125 0 0 -

- No D6 Bobbin

• 424 - - - -

New 96 Indica 5on -

1630 55 19 34.5 g Sum of AN 96 Indication 3589 4795 87 29 33.3 M Greator then 1.0 Volt in 1996 35 Bobbin Left in Service 885 869 196 186 94.9

- 95 RPC Confirmed 106 106 63 61 96.8

- 15RPC NDO 7 7 3 0 0.0

- D5 RPC Not inspected 756 756 130 125 96.2

- No 16 Bobbin

• 16 - - - -

New D6 Indicanon -

55 8 5 62.5 Sum of AN '96 Indication 885 924 204 191 93.6 A,1 Voltages in 1996 DS 9obbin Left in Service 4474 4034 228 196 86.0

- 95 RPC Confirmed 114 114 65 62 95.4

- '95RPC NDD 39 39 33 9 27.3

- '95 RPC Not inspected 3881 3881 130 125 96.2

- No '96 Bobbin

• 440 _

New 96 trxReation -

1685 63 24 38.1 Sum of AN '96 Indication 4474 5719 291 220 75.6 Indications split is based on '95 bobbin voltage CAE?ARS XL9TsMriee/3eems as Phe

1 . . . .

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4

Figure 3-3 Byron Unit -1 April 1996 Outage Bobbin Voltage Distributions at EOC-7B for Tubes in Service During Cycle 7B 300 280 -

i 260- -

240 - - -

ESG-A t 220 - - - -

200- - - - -

OSG-B p

j180- -- - - -

.s g w 1 160- - - - - --

BSG-C A O 1 to

• 140 = - - -

l 9

j120- - - ESG-D

$ 100- - - - l-80 - - - - -

m. - _ _ E 40 - - - -

i 20 - -

l 0-  ;  ; a + -- t  :  : d :A :d : ;'*:A: J : = : ': - : - :  : --: - ; - :- : -

- , , - . _ m , - . _ m , - _ , ,  :

o 6 6 6 6 a a a a a d d d d 5 5 4 t Bobbin Voltage I BORNRFC.ALSfig_3-3]

r 03-8 l 8

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x C;

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Figure 3-6 Byron Unit-1 April 1996 ODSCC Axial Distributions for Tubes in Service During Cycle 7B 1200 1000 E 800 - -

C 3 OSG-A 600 - BSG-B io $-

ESG-C f.

Z 400- -

ESG-D 200 -

0-- ' '

3II SII 7H 8H 911 10H 1111 llc 10C 9C 8C 7C SC 2C Tube Support Plate GROWTH.XLSFig_348/27/96 3.25 mi i

Figure 3-7 Byron Unit -1 Cycle 7B ( December 1995 to April 1996 )

Cumulative Probability Distributions for Voltage Growth on an EFPY Basis 1.0 --

m _ ..nnnnnn-=mmmmama 4N-O.9 - x x,N. 'x y',%. '

g.y,.-

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Figure 3-8 Comparison of Byron-1 Growth Rates Cumulative Probability Distributions on EFPY Basis Composite of All Four Steam Generators 1.0 _x_x_ ,_;_g_ , , ,g ,, , , ,,__ , ,, ,,,_,,,,_

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l 4.0 Database Applied for IPC Correlations 2 The database used for the IPC correlations that are applied in the analyses of this report is 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 application of i EPRI data exclusion criterion for very high voltage indications and concurrence by l the NRC. Byron-1 and Braidwood 1 pulled tube indications R16C42, TSP 5 (0.28 i 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 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 i leak rate correlation at a SLB leak rate of 2496 lph consistent with NRC  ;

recommendations. ~

l South Texas pulled tube data from 1993 and 1995 inspections are also included in the IPC database. The updated database is in compliance with NRC guidelines for application ofleak rate vs. voltage correlations and for removal of data outliers in i the 3/4 inch tubing burst and leak rate correlations. The updated IPC database '

for 3/4" tubes is documented in Reference 8.9 and that database was used to l perform the SLB leak rate and tube burst probability analyses reported here. The ,

same database was also applied for EOC-7A analyses reported in Reference 8.5.

)

i l

r s:\apc\cae96\EoC7B90d.wp5 4-1 I

- . - - - . - - - - __.. - _ = _ . . - .- -- - .-

5.0 SLB Analysis Methods  ;

}

Monte Carlo analyses are used to calculate the SLB leak rates and tube burst l probabilities for both actual EOC-7B and projected EOC-8 voltage distributions. l

The Monte Carlo analyses account for parameter uncertainty and they are i J

i consistent with the Byron Unit-1 SER. The analysis methodology is described in i Braidwood 1 document Reference 8-1 as well as in the Westinghouse generic  :

methods report of Reference 8-2.  :

i.  !

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 uncertainties are included in the analyses based on the actual measured j

,' voltage distribution (for the cycle just completed). Based on the 3/4" diameter ,

i tubing database, the NRC requirement that the p value obtained from the i l 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  !

i analyses of this report.

SLB leak rates and tube burst probabilities are calculated considering the locked '

TSP condition. With TSPs locked (by tube expansion), indications in the hot leg i 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 is on the cold leg side, the burst probabilities are expected ,

to be substantially smaller than those estimated with the usual IPC/APC '

methodology (which includes the entire indication population). Leak rate analyses for the hot leg indications include indications restrained from burst (IRBs) based i on a 6.0 gpm leak rate for IRBs. Leak rates for cold leg indications are calculated i using the methods of GL 95 05 (Reference 8.4) and Reference 8.2. Leak rates and l PoB calculated using the actual voltage distributions are compared with the i a corresponding prior projections for EOC-7B.

l 1

s:\apc\cae96\EoC7B90d.mp5 5-1  !

l

6.0 Bobbin Vdtage Distributions This section describes salient input data used to calculate EOC bobbin voltage distributions and presents the results of calculations to project EOC-7B voltage distributions. Also, EOC-7B voltage distributions projected based on the EOC-7A inspection bobbin voltage data are compared with the actual bobbin distributions from the current inspection.

6.1 Caladation of Vdtage Distributions The analysis for EOC voltage distribution starts with a cycle initial voltage

~

distribution which is projected to the end of cycle conditions 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 of reported indications to account for detection 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 ofindications present. A conservative value is assigned to POD based on historic data, and the value used herein is discussed in Section G-2. The calculation of projected bobbin voltage frequency distribution is based on a net total number of indications returned to service, defined as follows.

Nra ars = N, / POD - N,,,,i.,a + Na,,io,,,a where, Nr ars = Number of bobbin indications being returned to service for the next cycle N, =

Number of bobbin indications (in tubes in service) identified after the previous cycle

. POD = Probability of detection N,,,,i,,a = Number of N, which are repaired (plugged) after the last otle Na,,io,,,a = Number of N, which are deplugged after the last cycle and are returned to service in accordance with IPC applicability.

There are no deplugged tubes returned to service at BOC 7B.

The methodology used in the projection of bobbin voltage frequency predictions is described in Reference 8-2, and it is same as that used in performing similar predictions during the last (EOC-7A) inspection (Reference 8.5). Salient input data used for projecting EOC-7B bobbin voltage frequency are further discussed below.

s-\apc\cae9G\EoC7B90d.wp5 6-1

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; a voltage-dependent POD '

may provide a more accurate prediction of voltage distributions consistent with IPC/APC experience. In addition to a constant POD of 0.6, a voltage-dependent POD developed for EPRI is also used. The EPRI POD is based on expert opinion and multiple analyst's evaluation for plants with 3/4" diameter tubes, and it represents the lower 95% confidence bound. This POD distribution is graphically illustrated in Figure 6-1.

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 it is evident from Figure 3 8 that growth rates for Cycle 7B on an EFPY basis are higher than those of Cycles 7A or 6, Cycle 7B growth rate distribution is used to develop the EOC-7B predictions. The actual growth distribution used for EOC-8 projections is the SG B growth distribution which has the highest average growth rate among the four SGs during Cycle 7B as well as the indication with the largest voltage growth. As noted in Section 3.2, larger positive and negative values in the growth /EFPY distribution are likely to be overestimated since they were obtained by multiplying the actual growth observed during Cycle 7B by a factor of about 4, and as the negative values in the growth distribution used for next cycle projections are set to zero the average growth rate used for EOC-8 projections is very conservative.

The same conservative growth distribution was imposed on all four steam

. generators to provide a conservative basis for predicting EOC 8 performance. In addition,' as discussed in Section 3.2, it is conservative to apply the same conservative growth rate distribution for the cold leg indications.

6.4 Cyde Operating Period

. The operating periods used in the growth rate /EFPY calculations and voltage projections are shown on the next page.

s:\apc\cae96\EoC7B90d.wp3 6-2

Cycle 7B - MOC-7 to EOC-7 - 87.7 EFPD or 0.24 EFPY (actual)

Cycle 8 -

BOC-8 to EOC-8 - 493.1 EFPD or 1.35 EFPY (estimated) 6.5 Projeded EOC 8 Voltage Distribution Calculation of the predicted EOC-8 bobbin voltage distributions was performed for all four SGs based on the EOC-7B distributions shown in Table 6-1. The bobbin voltage distributions are shown separately for hot leg and cold leg indications in Table 6-1 since tube burst analyses need only be performed for the cold leg indications (locked TSPs constrain rupture of hot leg indications). The BOC distributions were adjusted to account for probability of detection as described above, and the adjusted number ofindications at BOC-8 are also shown in Table 6-1. Calculations were performed using a constant POD of 0.6 as well as the EPRI POD distribution. The highest growth rates observed among the four SGs in last two cycles operation, which are the EOC-7B SG B growth rates shown in Table 3-3, were used. The IPC voltage distributions projected for EOC-8 for all four SGs are summarized on Table 6-2. These results are also shown graphically on Figures 6 2 to 6 5. Only 31 indications were found on the cold leg side for all four SGs combined during the EOC-7B inspection, three of them were removed from service due to tube repairs, and the total at EOC-8 is projected to be about 49 for a POD of 0.6. The results for the cold leg indications are shown separately in Table 6-2, but they are combined with the hot leg results in Figures 6 2 to 6-5 because of the relatively smaller population of cold leg indications. The results based on a constant POD of 0.6 are more conservative than those using the voltage-dependent EPRI POD.

The predicted EOC-8 voltage distributions have a long tail which is a result of the long tail in the Cycle 7B growth distribution used in the projections. The peak voltages predicted for EOC-8 are more than 250% of those measured the during EOC-7B inspection and it is due to the longer operating cycle with associated conservatism in the EOC-7B growth rates used. Actual peak voltages at EOC 8 may be expected to be significantly below the projections shown here.

6.6 Comparison of Adual and Projeded EOC-7B Voltage Distributions Table 6-3, and Figures 6-6 and 6-7 provide a comparison of the EOC-7B actual measured bobbin voltage distributions with the corresponding projections performed using the last (EOC-7A) inspection bobbin voltage data. EOC-7B projections based on a constant POD of 0.6 as well as the voltage-dependent EPRI POD are shown. As reported in Reference 8-5 at BOC-7B, SG-B was projected to be the limiting SG and it was confirmed to have the largest indication measured in the EOC-7B inspection. The actual peak voltage for SG B was found to be about a:\ ape \cae96\EoC"B90d.wp5 63

1. .

0.5 volts higher than projected value.

A comparison of the actual and projected voltage distributions in Figures 6-6 and 6 7 show that in general the indication population above 0.6 volts is substantially overestimated in the projections based on a constant POD of 0.6. This POD value is conservative for voltages above about i volt but non-conservative below 1 volt.

The voltage-dependent EPRI POD shows a much better agreement with the actual measured distribution, although the projected distribution is still conservative.

6.7 Probe Wear Criteria

~

An alternate probe wear criteria discussed in Reference 8.7 was applied during the EOC-7B inspection. When a probe does not pass the 15% wear limit, this alternate criteria requires that all tubes with indications above 75% of the repair limit since the last successful probe wear check be reinspected with a good probe. Although the repair limit for hot leg indications is 3 volts, all indications for which worn probe voltage was above 0.75 volt were inspected with a new probe. An evaluation of worn probe and new probe data is presented in the following paragraphs.

In accordance with the guidance provided in Reference 8.7, voltages measured with a worn probe and a new probe at the same location were analyzed to ensure that the voltages measured with worn probes are within 75% of the new probe voltages.

Figures 6 8 and 6 9 show plots of the worn probe voltages plotted against the new probe voltages for all four SGs. These figures show a consistent relationship between the two voltages for all four SGs. Composite data from all four SGs are plotted in Figure 6-10. Also shown in Figure 6-10 as a solid line is a linear regression for the data, dashed lines representing tolerance limits that bound 90%

of the population at 95% confidence, and chained lines representing *25% band for the new probe voltages. The mean regression line shows a slight bias for the average worn probe voltages to be higher than the new probe voltages. In addition, more data points are above (high worn probe volts) the 90%/95%

tolerance band than below (low worn probe volts) the tolerance band. The results show that use of the worn probe volts would be conservative compared to use of the

, new probe volts for leak and burst analyses.

Only five indications are significantly below the chained line representing 75% of the new probe voltage while a relatively large number ofindications have worn probe voltages above 75% of the new probe volts. There are no occurrences for which a worn probe was less than 2.25 volts and the new probe voltage exceeded the plugging limit, i.e., no pluggable tubes were missed due to probe wear considerations. There is only one indication (at 1.3 volts new, 0.7 volt worn, at R45C74 05H in SG C) which could have been considered below the repair limit based on worn probe response while potentially pluggable for the 1 volt cold leg repair criteria. This was a hot leg indication and all voltages were well below the s;\apc\cae96\EOC7B90d.wp5 64 l

3.0 volt repair limit. The worn probe would have identified 6 indications as being above 1 volt that had a new probe voltage below 1 volt.

Overall, it is concluded that the criteria to retest tubes with worn probe voltages above 75% of the repair limit is adequate and moderaidy conservative due to the average trend for worn probe volts to exceed new prcbe voltages.

Comparison of the actual and projected EOC-7B voltages presented in Section 6-6 does not show anything unusual attributable to the alternate probe wear criteria.

The projected voltages are conservative, which is attributable to conservatism in the growth rates and the POD value (0.6). In summary, the alternate probe wear criteria used in the EOC 7B inspection is consistent with the NRC guidance provided in Reference 8.7.

s:\ ape \cae96\EOC7B90d wp5 65 i

. e n .

TLble 6 -1 (Sheet 1 of 2)

Byron Unit-1 April 1996 Actual EOC-7B and Assumed BOC-8 Voltage Distributions Used in SLB Leak Rate and Tube Burst Probability Analyses Steam Generator A Steam Generator B Voltage EOC-7B BOC-8 EOC-78 BOC-8 Bin in service Repaired POD = 0.6 EPRI POD in sevice Repaired POD = 0.6 EPRI POD Hot Cold Hot Cold Hot Cold Hot Cold Hot Cold Hot Cold Hot Cold Hot Cold Side Side Side Side Side Side Side Side Side Side Side Side Side Side Side Side 0.1 1 0 0 0 1.67 0.00 3.33 0.00 2 0 0 0 3.33 0.2 35 0.00 6.66 0 00 1 0 0 58.33 1.67 109.38 3.20 25 0 0 1

0.3 0 41.67 1.67 78.13 0.00 124 1 1 0 205.67 1.67 I 287.37 2.60 131 4 6 0 212.33 5.00 0.4 155 5 6 0 252.33 8.34 298 65 10.50- )

281.04 10.30 231 4 9 0 376.00 6.67 '

O.5 145 418.78 8.30 1 11 0 230.67 1.67 236.16 1.80 252 0 0.6 11 0 409 00 0.00 418.55 0 00 126 1 10 0 200 00 1.67 188.95 1.70 245 1 8 0 400.33 1.67 0.7 110 0 378.84 1.70 8 0 175.33 0.00 153.77 0.00 220 2 13 0.8 74 1 353.67 2.33 310.53 2 tso 0 6 0 117.33 0.00 95.37 0.00 146 0 6 0 237.33 0.00 194.00 0.00 09 67 0 7 0 104.67 0.00 78.90 0.00 109 0 3 0 178.67 0.00 136.74 1 42 0 5 0 0.00 65.0) 0.00 46.69 0 00 94 8 0 1.1 1 148.67 1.67 107.69 1.30 33 0 2 0 53 01 0.00 37.05 0.00 80 0 5 0 128.33 0.00 09.68 1.2 24 0 4 0 0.00 36 00 0.00 23.35 0.00 49 0 6 0 cb 1.3 75.67 0.00 49.84 0.00 20 0 1 0 32.33 0.00 20.98 0 00 59 0 1 0 97.33 0 00 63.84 cm 1.4 15 0 3 0 0 00 22.00 0.00 13.23 0.00 31 0 3 0 1.5 48.67 0 00 30.55 0.00 12 0 3 0 17.00 0.00 9.79 0 00 19 0 3 0 28.67 0.00 17.26 0.00 1.6 7 0 0 0 11.67 0.00 7.35 0.00 29 0 3 0 45.33 0.00 1.7 7 0 27.46 0.00 0 0 11.67 0.00 7.25 0.00 0 13 1 0 20.67 0.00 12.46 0.00 1.8 4 0 0 0 6.67 0.00 4.08 0.00 7 0 0 10.67 1.9 6 1 0.00 6.14 0.00 0 1 0 9 00 0.00 5.11 0.00 7 0 0 0 11.67 0.00 7.13 0.00 2 1 0 0 0 1.67 0.00 3.00 0.00 2 0 1 0 2.33 0.00 1.03 2.1 2 0 0 0.00 0 3.33 0.00 0.00 0.00 4 0 1 0 5.67 0.00 3.06 0.00 2.2 1 0 1 0 0.67 0.00 0.01 0.00 6 0 2 0 8 00 0.00 4.08 2.3 0 0.00 1 1 0 0.67 0.00 0.01 0.00 2 0 0 0 3.33 0.00 2.02 0.00 2.4 0 0 0 0 0.00 0.00 0.00 0.00 1 0 0 0 1 67 0.00 1.01 2.5 0 0 0 0.00 0 0.00 0.00 0.00 0.00 7 0 2 0 9.67 0.00 6.10 0.00 2.6 0 0 0 0 0.00 0.00 0.00 0.00 2 0 1 0 2.33 0.00 1.01 2.7 0 0 0 0.00 0 0.00 0.00 0.00 0.00 0 0 1 0 1.67 0.00 0.00 0 00 2.8 1 0 1 0 0.67 0.00 0.00 0.00 0 0 0 0 0.00 0.00 0.00 3.1 0 0 0 0.00 0 0.00 0.00 0.00 0.00 0 1 1 0 0 67 0.00 0.00 0.00 3.3 0 0 0 0 0.00 0.00 0.00 0.00 1 0 1 0 0.67 0.00 0.01 0.00 3.4 0 0 0 0 0.00 0.00 0.00 0.00 1 0 1 0 0.67 0.00 0.00 0.00 3.5 1 0 1 0 0.67 0.00 0.00 0.00 1 0 1 0 0.67 0.00 0.00 4.5 0 0 0 0.00 0 0.00 0.00 0 00 0.00 0 1 1 0 0 67 0.00 0.00 0.00 Total 1014 9 72 0 1618.00 15 00 1612.17 19.60 1779 12 99 1 2866.00 19 00 2671.25 23.80

> IV 135 0 18 0 207.00 0.00 131.23 0.00 324 0 35 0 505.00 0.00 322.68 0.00

> 3V 1 0 1 0 0.67 0 0.00 0 5 0 5 0 3.33 0.00 0.01 0 00

a . . .

Table 6 - 1 (Sheet 2 of 2)

Byron Unit-1 November 1995 Actual EOC-7A and Assumed BOC-7B Voltage Distributions Used in SLB Leak Rate and Tube Burst Probabiffty Analyses Steam Generator C Steam Generator D Votege EOC-78 BOC-8 EOC-78 BOC-4 Bin in service Repelred POD = 0.8 EPRI POD in service Repelred POO = 0.6 EPRI POD H3t Cold Hot Cold Hot Cold Hot Cold Hot Cold Hot Cold Hot Cold Hot Cold Side Side Side Side Side Side Side Side Side Side Side Side Side Side Side Side 0.1 0 0 0 0 0.00 0.00 0.00 0.00 0 0 0 0 0.00 0.00 0.00 0.00 0.2 33 0 1 0 54.00 0.00 102.13 0.00 38 1 1 0 62.33 1.67 117.75 3.20 0.3 171 0 5 0 280.00 0.00 392.67 0.00 137 4 1 1 227.33 5.67 317.61 9.70 04 255 2 7 0 418.00 3.33 465.22 420 179 0 9 0 289.33 0.00 322.48 1.79 0.5 275 0 7 0 451.33 0.00 461.75 0.00 141 1 4 0 231.00 1.07 236.34 0.00 0.6 280 0 7 0 459.67 0.00 435.11 0.00 97 0 4 0 157.67 0.00 149.16 0.00 0.7 230 1 12 1 371.33 0.67 326.24 0.50 62 0 6 0 97.33 0.00 85.18 0.00 0.8 204 0 8 0 332.00 0.00 271.45 0.00 45 0 4 0 71.00 0.00 57.64 0.00 0.9 119 0 2 0 196.33 0.00 150.56 0.00 29 0 4 0 e 4.33 0.00 33.18 0.00 1 100 1 5 0 161.67 1.67 118.08 1.23 35 0 2 0 56.33 0.00 41.08 0.00 1.1 89 0 2 0 146.33 0.00 103.33 0.00 31 0 1 0 50.67 0.00 35.69 0.00 1.2 57 0 1 0 94.00 0.00 63.96 0.00 14 0 0 0 23.33 0.00 15.95 0.00 9 1.3 66 0 1 0 109.00 1.67 71.53 1.09 13 0 0 0 21.67 0.00 14.29 0 00 1.4 40 1 1 0 65.67 0.00 4229 0.00 5 0 0 0 8.33 0.00 5.41 0.00 1.5 34 0 0 0 56.67 0.00 36.25 0.00 6 0 0 0 10.00 0.00 6.40 0.00 1.6 19 0 0 0 31.67 0.00 19.96 0.00 8 0 2 0 11.33 0.00 6.40 0.00 1.7 14 0 0 0 23.33 0.00 14.49 0.00 4 0 3 0 3.67 0.00 1.14 0.00 1.8 9 0 3 0 12.00 0.00 6.18 0.00 4 0 2 0 4.67 0.00 2.08 0.00 1.9 11 0 2 0 16.33 0.00 9.21 0.00 4 0 2 0 4.67 0.00 2.08 0 00 2 4 0 2 0 4.67 0.00 2.07 0.00 3 0 2 0 3.00 0.00 1.05 0.00 i 2.1 6 0 3 0 7.00 0.00 3.09 0.00 0 0 0 0 1.67 0.00 1.02 0.00

_ 2.2 3 0 0 0 5.00 0.00 3.04 0.00 1 0 0 0 0.00 0.00 0.00 0.00 2.3 6 0 2 0 8.00 0.00 4.07 0.00 0 0 0 0 0.00 0.00 0.00 0.00 2.4 5 0 4 0 4.33 0.00 2.10 0.00 0 0 0 0 0.67 0.00 0 01 0.00 2.5 1 0 0 0 1.67 0.00 1.00 0.00 2 0 2 0 0.67 0.00 0.00 0.00 2.6 1 0 0 0 5.00 0.00 0.00 0.00 0 0 0 0 0.00 0.00 0.00 0.00-2.7

• 0 0 0 1.67 0.00 3.02 0.00 0 0 0 0 0.00 0.00 0.00 0.00 2.8 2 0 0 0 0.00 0.00 0.00 0.00 0 0 0 0 0.00 0.00 0.00 0 00 3.1 0 0 0 0 0.00 0.00 0.00 0.00 1 0 1 0 C.67 0.00 0.00 0.00 3.3 0 0 0 0 0.00 0.00 0.00 0.00 0 0 0 0 0.00 0.00 0.00 0.00 3.4 0 0 0 0 0.00 0.00 0.00 0.00 0 0 0 0 0.00 0.00 0.00 0.00 3.5 0 0 0 0 0.00 0.00 0.00 0.00 0 0 0 0 0.00 0.00 0.00 0.00 4.5 0 0 0 0 0.00 0.00 0.00 0.00 0 0 0 0 0.00 0.00 0.00 0.00 Total 2035 5 75 1 3316.67 7.34 3108.78 7.02 859 6 50 1 1381.67 9.00 1451.92 14.69

> 1V 368 1 21 0 592.34 1.67 385.57 1.09 96 0 15 0 145.00 0 91.51 0

> 3V O O O O O O O O 1 0 1 0 0.67 0 0.00 0 em...

Tcble 6 -2 (Sheet 1 of 4)

Byron Unit-1 April 1996 Voltage Distribution Projection for EOC - 8 Steam Generator A Stoem Generator B POD EM POO Em SA Poo SA Poo vonsee HotLog lCeWLeg Hot Leg l cow Leg Hot Leg l cow Leg Hot Lag l CoM Leg Projected NumberofIndication8 et EOC 8 0.1 1.20 0 00 2 29 0.00 1.44 0 00 2 81 0 00 02 19.81 0.36 34 67 0 69 15.99 0.16 27.42 0.28 0.3 60.10 0 90 83.36 1.80 85.22 1 55 89.06 2 40 O4 83 46 1 91 99 58 2.44 117.08 2 09 13586 2.78 0.5 94.30 1.52 106.11 1.88 149.78 1.12 162.16 1.47 06 _ 103 06 1.17 111.85 1,48 172 77 1.32 178 94 1.69 0.7 106.73 1.09 111.27 1.38 183.16 1.49 182 86

• 1.83 0.8 104.16 0 99 105.15 1.25 180.56 1.18 174 97 1 44 09 99 78 0 82 98 40 1.05 175.16 1.10 ,165 69 1.32 1.0 93.13 0.74 89.58 0 93 168 07 1.09 154 95 1.25 1.1 85.03 0 61 80.05 0.77 157.28 0 89 141.66 1.01 1.2 77.72 0.52 72.57 0 86 145.26 0.75 128.80 0 87 1.3 71.56 0 47 66.30 0 81 134.28 0.73 117.89 0.87 14 64 62 0 45 58 80 0.57 122 94 0 65 106.43 0.75 1.5 57 86 0.38 52 26 0 47 111.14 0.50 f 5.21 0.57 16 52.25 0.31 46 94 0 40 100 44 0.48 85.50 0.56 1.7 46.58 0.29 41.32 0.37 89.95 0 43 75.85 0.49 18 41.09 0.24 36.13 0.30 79.36 0.33 86.48 0 38 1.9 36.70 0.21 32 48 0.27 70.34 0.30 58 85 0.35 2.0 33.19 0.20 29 54 0.26 63.13 0.31 53.01 0.37 2.1 29.57 0.20 26.11 0.25 56.70 0.27 47.41 0.32 2.2 __26.09 0.16 22.93 0.20 50.61 0.21 42.14 0.24 2.3 23.05 0.13 20 26 0.17 45 16 0.19 37.48 0.22 24 20 37 0.12 17.85 0 15 40.14 0.18 33.17 0.20 2.5 17.97 0 11 15.76 0.13 35.58 0 15 29.29 0.17 26 16.01 0 10 14.15 0 12 31.75 0.14 26.15 0.16 2.7 14.29 0.01 12 60 0.11 28.50 0 13 23.49 0.16 2.8 12.65 0.00 11.13 0 10 25.43 0.11 20.90 0.12 29 11.40 0.00 10.17 0.07 22.80 0.10 18.83 0.11 30 10 45 0.00 9 41 0 00 20.72 0.06 17.22 0.12 3.1 9 52 0.00 8 55 0.00 10 84 0.00 15 73 0.11 3.2 8.65 0.70 7.78 0.00 17.13 0 00 14 30 0.03 33 7.90 0 00 7.15 0 00 15 65 0.00 13.10 0.00 34 7.18 0 00 6 46 0.70 14.24 0 00 11.91 0.00 35 6 54 0 00 5 91 0.00 12.89 0.70 10.78 0.00 36 6.00 0 00 5.58 0 00 11.85 0 00 9.98 0 00 3.7 5 58 0 00 5.04 0.00 10.01 0 00 9.17 0.70 38 4 90 0 00 4.29 0.00 9 82 0.00 8.13 0 00 39 4.29 0 00 3.78 0 00 8 68 0.00 7.11 0.00

. 40 3 97 0 30 3 57 0 00 7.82 0.00 6 47 0 00 4.1 3 73 3 42 0 00 7.19 0 00 6 02 0 00 42 3 55 3.31 0 00 6.75 0 00 5.74 0 00 4.3 3.38 3.14 0.30 6.44 0 30 5.52 0 00

, 44 3 11 2.86 6.06 5.16 0.00 4.5 2 85 2.60 5 56 4.72 0.30 46 2.56 2.29 5 04 4.23 47 2.21 1.92 4.45 3 65 48 1.87 1.57 3 82 3.06 49 1.57 1.28 3.25 2.54 50 1.31 1,06 2.74 2.10 51 1.10 0 92 2.32 1.77 5.2 0 98 0 83 2 03 1.56 5.3 0 89 0 77 1.81 1.42 64 0 80 0 70 1.64 1.31 55 0 72 0 62 1.48 1.17 56 0 63 0 54 1.31 1.04 57 0.56 0 48 1.15 0 91 5.8 0.50 0 43 1.01 0.60

$9 0 45 0 39 0 90 0.72 60 0 41 0 36 0 82 0 66 Table contmuss On Sheet 2 l

-. - m "

6-8

i 1

Tcble 6 - 2 (Sheet 2 of 4)

Byron Unit-1 April 1996  ;

Voltage Distribution Projection for EOC - 8 Stoem Generator A Steam Generator B POD EPRI POD EPRI venage o.s Poo c.s Poo

"" HotLeg C W Le9 Hot Leg CW Leg Hot Leg CW Leg Hot Log CW Leg Projected NumberofIndications et EOC 8 6.1 0.38 0.34 0.75 0.61

. 6.2 0.36 0.33 0.71 0.58 6.3 0.34 0.31 0.66 0.55 64 0.31 0.28 0.61 0.51 1 6.5 0.28 0.25 0.56 0.46 l

,. 6.6 0.25 0.22 0.50 0.41 l

6.7 0 22 0.20 0.45 0.37 1 6.8 0.20 0.18 0.40 0.33 6.9 0.19 0.17 0.37 0.30 7.0 ___ 0.17 0.15 0.33 0.28 7.1 0.15 0.13 0.30 0.25 7.2 0.13 0.11 ,

0.27 C.21 7.3 0.11 0.10 0.23 0.18 7.4 0.10 0.08 0.20 0.16 7.5 0.09 0.07 0.17 0.13 1 7.6 0 08 0.06 0.15 0.12 7.7 0.07 0 06 0.14 0.11 7.8 0.06 0.06 0.12 0.10 7.9 0.06 0.05 0.11 0.09 8.0 0.06 0.05 0.11 0.09 8.1 0.05 0.05 0.10 0.09 8.2 0.05 0.05 0.10 0.08 8.3 0.05 0.05 0.09 0.08 8.4 0.05 0.05 0.09 0.08 8.5 0.05 0.05 0.09 0.08 8.6 0.05 0.05 0.09 0.08 i 8.7 0.05 0.05 0.09 0.08 8.8 0.05 0.05 0.09 0.08 8.9 0.05 0.05 0.08 0.08 9.0 0.05 0.05 0.09 0.08 9.1 0.06 0.06 0.10 0.10 9.2 0.07 0.08 0.11 0.12 9.3 0.09 0.09 0.14 0.14 94 0.10 0.11 0.16 0.16 i 9.5 0.11 0.11 0.18 0.18  !

9.6 0.12 0.12 0.19 0.19

)

0.7 0 12 0.12 0.20 0.20 9,8 0.11 0.11 0.20 0.19 9.9 0.11 0.10 0.19 0.18

. 10.0 0.10 0.07 0.18 0.16 10.1 0.07 0.00 0.17 0.15 10.2 0.00 0.00 0.16 0.14 10.3 0.00 0.00 0.15 0.13 10.4 0.00 0.00 0.14 0.13 10.5 0.00 0.70 0.14 0.13 10.6 0.70 0 00 0.14 0.07 10.7 0.00 0.00 0.13 0.00 10.8 0.00 0.00 0.01 0.00 11.0 0 00 0.00 0.00 0.70 11.1 0.30 0.30 0.70 0.00 11.3 0.00 0.30 11.5 0.30 TOTAL 1818.01 15.01 1612.23 19.88 2886,01 19.01 2671.21 23.64

>1V 852.29 5.51 760.98 6.98 1636.79 7.91 1396.51 9.18

>3V 103.87 1.00 93.24 1.00 205.31 1.00 170.77 1.14

,* - --ma 6-9

Tebis 6 - 2 (Shxt 3 cf 4)

Byron Unit 1 April 1996 Voltage Distribution Projection for EOC - 8 Steam Generator C Steam Generator D POD EPRI POD EPRI 8.6 POD 0.8 POD vone9

" Hot Leg l cow Log Hot Leg l CoM Leg Hot Leg l CoM Leg Hot Leg l CoM Leg Projected NumberofIndications at EOC 8 01 0 68 0 00 1.30 0 00 0.79 0.00 1.50 0.00 0.2 20.54 0 00 35 34 0 00 21.25 0.47 37.28 0 88

, 0.3 82.70 0 14 113.20 0.19 66.58 1.45 92 17 2 58 04 133 98 0 68 15647 0.86 92.72 0 68 110.58 1.00 05 169 A5 0 30 184 54 0.37 96 44 0 ?6 129 53 1.12 06 190 A0 0.22 205.26 0.29 94.77 0.72 105.81 1.18 0.7 209.93 0.34 210.34 0.38 91.51 0.58 09 54

• 0 93 08 21039 0.32 203.79 0.35 2g.22 0.50 91.51 0.79 09 203.05 0.30 192.67 0.31 8.43 0.48 64.58 0.76 1.0 193.17 0.38 178 79 0.37 7624 0.37 76 89 0 58 1.1 181.21 0.37 16381 0.34 69 17 0.31 68.21 0 48 1.2 168 39 0.36 149 90 0.31 62.33 0.29 61.33 0 47 1.3 156 49 0.38 138.01 0.33 57.12 0.30 56.12 0.49 1.4 143.32 0 41 124 44 0.35 51.52 0.21 49.70 0.32 1.5 123.50 0.35 111.37 0.28 4574 0.20 43.69 0.31 1.6 116 99 0.31 100.15 0.25 40 91 0.19 38.97 0.30 1.7 104 55 0.29 88.57 0.24 36.24 0.14 33.98 0.22 1.8 92.56 0.24 77 68 0.19 31.62 0.12 29.33 0.19 1.9 82.03 0.20 68 95 0.16 28.14 0.12 26.39 0.20 2.0 73.70 0.19 62.12 0.16 25 83 0.11 24.36 0.21 2.1 66 00 0.18 55.31 0.15 23.24 0.00 21.67 0.14 2.2 58.76 0.14 49 05 0.12 20.40 0.00 18.87 0.13 2.3 52.35 0.12 43.54 0.03 17.88 0 00 16.52 0.12 2.4 46 54 0.11 38 51 0 00 15.74 0.00 14.49 0.10 2.5 41.24 0.00 34.07 0.00 13.91 0 00 12.83 0.08 2.6 36.71 0.00 30.41 0.00 12.52 0.70 11.63 0.00 2.7 32.84 0.00 27.19 0.00 11.28 0 00 10 44 0.00 28 29.20 0.00 24.00 0.70 9 98 0 00 9 21 0.00 29 26.22 0.70 21.84 0.00 0 00 0.00 8.46 0.00 30 23.80 0.00 19 99 0 00 8.34 0.00 1.90 0.00 31 21.64 0 00 18.21 0 00 7.67 0 00 7.26 0.70 3.2 19 63 0.00 16.56 0 00 6 95 0.00 6.58 0.00 33 17.87 0.00 15.18 0 00 6.35 0.00 6 04 0.00 34 16.25 0.00 13.77 0.00 5.75 0 00 5 42 0 00 3.5 14 71 0.00 12.49 0.00 5.20 0.30 4.96 0 00 36 13 55 0.00 11.65 0.00 4 89 4.74 0.00 3.7 12.42 0.00 10.62 0.30 4.52 4.30 0 00 38 11.14 0.00 9.36 3 90 3.59 0.00 39 9.84 0.30 8.22 3.32 3.06 0 30

- 40 8 91 7.56 3.07 2.94 41 8.20 7.05 2 99 2.93 42 7.69 6.69 2.93 2.91 4.3 7.30 6 41 2.83 2.79

. 44 6.82 5.95 2.58 2.49 4.5 6 32 5 47 2.28 2.20 46 5.72 4 91 2.00 1.89 4.7 5.03 4 22 1.69 1.53 48 4.33 3.54 1.38 1.22 49 3 66 2 95 1.13 0 97 5.0 3.09 2 45 0 95 0 81 5.1 2.83 2.07 0 82 0.71 5.2 2.28 1.82 0.75 0 67 53 2.04 1.67 0.71 0 65 54 1 85 1.52 0 65 0.61 55 1.65 1.36 0.57 0.52 56 1.46 1.21 0 49 0 44 57 1.29 1.06 0 42 0.39 5.8 1.13 0 93 0 38 0.35 59 1.00 0.83 0 35 0.32 60 0.91 0 76 0.33 0.31 Tabie continues on Sheet 4 6-10

i l

Tcble 6 -2 (Sheet 4 of 4)

Byron Unit-1 April 1996 Voltage Distribution Projection for EOC - 8 Steam Ge ,rator C Steam Generator D l POD EMU POD EPRI

'# "00 '# '00 voltase

"" Hot Leg Cold Leg Hot Lag ColJLag Hot Leg Cold Lag Hot Leg Cold Lag Projected NumberofIndications at EOC.8 6.1 0.84 0.71 0.31 0.30

. 6.2 0.79 0.68 0.29 0.29 6.3 0.74 0.64 0.28 0.27 6.4 0.69 0.59 0.25 0.24 l 6.5 0.62 0.53 0.22 0.21 6,6 0.56 0 47 0.19 0.18 6.7 0.50 f

0.42 0.17 0.16 6.8 0.45 0.38 0.16 0.15 6.9 0.41 0.35 0.15 0.14 7.0 0.38 0.32 0.14 0.13 7.1 __ 0.34 0.28 0.12 0.11 7.2 0.30 0.25 0.10 0.09 7.3 0.26 0.21 0 08 0.07 7.4 0.22 0.18 0.07 0.06 7.5 0.19 0.16 0.06 0.06 7.6 P.17 0.14 0.06 0.05 7.7 0.15 0.13 0.05 0.05 7.8 0.14 0.12 0.05 0.05 l 7.9 0.13 0.11 0.05 0.05 80 0.12 0.10 0.04 0.04 8.1 0.11 0.10 0.04 0.04 8.2 0 11 0.10 0.04 0.04 8.3 0.11 0.09 0.04 0.04  ;

84 0.10 0.09 0.04 0.04 '

8.5 0.10 0.09 0.04 0.04 8.6 0.10 0.09 0.04 0.04 8.7 0.10 0.09 3.04 0.04 8.8 0.10 0.09 0.04 0.04 8.9 0.10 0.09 0.04 0.04 9.0 0.10 0.09 0.04 0.05 I

9.1 0.11 0.11 0.05 0.06 9.2 0.13 0.14 0.07 0.08 i 9.3 0.16 0.16 0.08 0.09 94 0.18 0.19 0.09 0.10 <

9.5 0.20 0.21 0.10 0.11

. 96 0.22 0.22 0.10 0.11 9.7 0.23 0.23 0.10 0.11 9.8 0.23 0.22 0.10 0.09 9.9 0.22 0.21 0.02 0.00

- 10 0 0.21 0.19 0.00 0.00 10.1 0.20 0.18 0.00 0.00  !

10.2 0.18 0.16 0.00 0 00 10.3 0.18 0.16 0.00 0.70 10 4 0.17 0.15 0.70 0.00 i 10.5 0.16 0.15 0.00 0.00 10 6 0.16 0.14 0.00 0.00 l 10.7 0.15 0.11 0.00 0.00 10.8 0.15 0.00 0.00 0.00 10.9 0.01 0.00 0.00 0.30 11.0 0 00 0.70 0.30 11.2 0.70 0.00 11.4 0.00 0.30 11.5 430 TOTAL 3316.67 7.33 3108.75 7.02 1381.67 9.00 1451.93 14.67 e1V 1895 15 4.65 1626.33 3 91 673 42 2.99 642.25 4.76

>3V 232.76 0.30 197.35 0 30 82.52 0.30 78.16 1.00 6-11

Table 6-3 ,

Byron Unit 1 April 1996 I Comparison of Preolcted and Actual EOC 7B Voltage Distributions i SteamGenerator A Steam Generator B SteamGenerator C SteamGenerator D ,

soc.7s Preensen soc.7s socJe Preecmon socJe EoCJs Preecern EoC-75 EOCJs Preact6cn EoC-75 sen gg Actual gg Actual g Actual Actual Poo = o.s ,,, Poo = o.s Po0. o.s Poo e.s e m roo Number of indications

• I 0.1 0.04 0.08 1 0.06 0.10 2 0.09 0.17 0 0 04 0.09 0 l 0.2 3 87 6 94 36 5 84 10.14 25 7.99 14 34 33 5.24 1084 39 i 0.3 31.21 45.03 125 59.96 84.87 135 50 86 73.99 171 45 80 68.97 141 1

, 04 101.87 125.12 160 176 41 216.57 235 145.99 178.35 257 122.31 157.37 179 05 174.25 191 99 146 275 86 304.22 252 267.79 291.03 275 169.40 192.41 142 O6 205 86 208.29 127 321.14 326 13 246 345 15 348.09 280 174 67 179.75 97 0.7 194.50 183.90 110 330.11 310 61 222 349 96 330.96 231 160.02 151.31 62 08 163 95 145 94 74 304.59 269.50 146 317.05 281.35 204 133.35 116 86 45 09 134.25 111.37 67 255 95 213 55 109 265.82 222.47 119 104.62 84 98 29 .

1.0 107.24 83.69 42 202.14 15949 95 212.97 168 81 101 80.24 60.79 35 1.1 82 46 61.26 33 153 69 114 65 80 166.06 125 47 89 60.81 43.66 31 1.2 62.89 44.75 24 113.00 79 84 49 127.31 92 47 57 45 64 31.39 14 1.3 47.71 32.73 20 81.77 55.05 59 95 99 67.41 66 33 96 22.66 13 1.4 35 26 23 63 15 57.87 36.97 31 71.22 48.52 41 25.24 16.38 5 1.5 2540 16 63 12 41.58 25.10 19 51.60 34.30 34 18 86 11.88 6 1.6 18.06 11.63 7 30.16 17.70 29 36.48 23.60 19 14.19 8.58 8 1.7 12.96 8.22 7 22.70 1302 13 25 39 16 07 14 1084 6 41 4 18 9 47 5 94 4 17.32 10.00 7 17.57 1088 9 8.40 4.91 4 1.9 6 98 4 36 6 13 64 7.83 7 12.22 7.50 11 6 49 3.80 4 j 2.0 5.13 3.20 1 10 69 6.22 2 8 63 5.26 4 4.95 2.93 3 i 2.1 3 80 2.37 2 8 41 4 96 4 6.25 3 83 6 3.78 2.21 0 l

2.2 2.78 1.76 1 6 68 3 94 6 4.64 2 84 3 2.87 1.69 1 2.3 2.04 1.32 1 5.19 3.10 2 3.54 2.16 6 2.21 1.30 0 24 1.54 1.00 0 4 09 2.44 1 2.78 1.71 5 1.75 1.05 0 2.5 1.14 0.75 0 3.20 1.96 7 2.25 1.37 1 1.44 0.84 2 2.6 0 85 0 59 0 2.64 1.57 2 1.85 1.15 1 1.22 0.71 0 2.7 0 69 0.51 0 2.10 1.34 1 1.59 1.04 1 1.10 0.68 0 2.8 0.65 0 53 1 1.88 1.31 0 1.45 1.02 2 8

1.11 0.77 0 2.9 0.65 0 55 0 1.74 1.23 0 1.39 1.04 1.06 0.70 0 30 0 60 0 48 0 1.48 1.05 0 1.27 0 97 0 91 0.57 0

~

3.1 0 50 0.37 0 1.24 0 89 1 1.05 0.79 0.76 0 47 1' 3.2 0 40 0 70 0 1.05 0.71 0 0 84 0.61 0.62 0.31 3.3 0 33 0 30 0 0 79 0.53 1 0 64 0 45 0 47 0 70

• 3.4 0 04 0 0 60 0.27 1 0 48 0.09 0 31 0.30 3.5 0.70 1' 0 43 0 70 1 0.21 0.70 0.00 1 36 0 00 0 00 0.00 0.00 0.00 0.70 3.7 0 00 0.00 0.00 0.70 0.30 0 00 38 C 00 0.70 0.30 0 00 0.00 39 0 30 0.00 0.30 . 0.30 40 0.30 45 1' Total 1440.37 1325 93 1023.00 2516 90 22s7.as 1791.00 2o07.37 2361.11 2040 00 1245.es 116a27 ees

• Bin with the lorpost indcation found in the steem ge.nerator l

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Figure 6-6 Byron Unit-1 Comparison of Predicted and Actual Bobbin Voltage Distributions for Cycle 7B Combined Data for Hot and Cold Leg Indications Steam Generator A 2so 200 DActual

. ,$o _ s Prediction, POD =0.8 A D Predicted, EPRI POD 1

100 - - - -

a so _ _

0- - E - OL^^- -

E  :  :  :  :  :  :  :  : E  :  :  :  :  ;  :  : l sobbin voitae.  !

._ i Steam Generator B j 380  !

320 280 ~

CActual 22 s Prediction, POD =0.8 5200 -

G Predicted, EPRI POD .

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5 ,2o -

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E  : : : :  : :  :  :  :  :  :  :  :  :  :  :  :  :

Bobbin Voltage

. . - = . 6-18

Figure 6-7 Byron Unit 1 Comparison of Predicted and Actual Bobbin Voltage Distributions for Cycle 7B Combined Data for Hot and Cold Leg Indications Steam Generator C 400 350 m - -. .

OActual

1. 5 Prediction, POD =0.8 200 - - -

G Prediction, EPRI POD o -

150 - - - -

100 -- - ,

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7.0 SLB Leak Rate and Tube Burst Probability Analyses 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-7B inspection as well as for the projected EOC-8 voltage distributions. The methodology used in these analyses is described in Section 5.0.  :

Since TSPs are locked by tube expansion (to support a 3 volt IPC), analyses were  !

performed separately for the indiention population on the hot leg and cold leg sides i of each generator since only indications on the cold leg are to be considered for tube burst probability analysis. SG-C with the largest number ofindications on l the hot leg side is expected to yield the limiting SLB leak rate for Cycle 8, and SG  :

B with the largest number of indications on the cold leg side is expected to be l limiting from the tube burst probability standpoint.

7.1 leak Rate and Tube Burst Probability for EOC-7B Analyses to calculate EOC-7B SLB leak rate and tube burst probabilities were performed using the actual bobbin voltage distributions presented in Table 6-1 and these analyses were performed separately for hot leg and cold leg indications, as discussed above. Results ofMonte Carlo calculations are summarized on Table 7-1.

A comparison of the EOC-7B actuals in Table 7-1 with the corresponding predictions performed during the EOC-7A inspection, shown here in Table 7-2, indicates the following.

a) For both POD of 0.6 and EPRI POD, SG B was predicted to be the limiting steam generator for EOC-7B based on a voltage distribution projection performed during the EOC-7A inspection.

b) SG-B was confirmed to have the highest tube leak rate based on actual EC bobbin measurements for EOC-7B. As with the projections, tube burst

, probabilities based on the actual, measured voltages are below 4x10 8 for all SGs.

c) The leak rate and tube burst probability predictions for the projected EOC-7B indication population distribution, based on the EOC-7A inspection data, are conservative compared to the corresponding values calculated using actual measured bobbin measurements for EOC-7B for all SGs except SG B. l Leak rate based on the actual measured voltage distribution for SG B is a i negligible 0.02 gpm (0.09 gpm for EPRI POD) higher than its projected value, which is primarily due to the detection of just one indication at 4.5 i volts that was not predicted. '

sAapc%ac96\EOC7B90d.wp5 7-1

d) The leak rate and tube burst probability predictions for all four SGs based EOC-7B bobbin measurements are well within the allowable limits.

In summary, with the exception of the negligible difference in the SLB leak rate for SG B, Monte Carlo analysis results based on the actual EOC-7B bobbin voltage distributions for all SGs are below the corresponding projections assuming a voltage distribution based on the NRC SER endorsed probability of detection of 0.6.

Leak rate based on the actual measured voltage distribution for SG B is about 0.02 gpm higher than its projected value which is primarily due to the detection of just one indication at 4.5 volts that was not predicted. Limiting values for SLB leak rate (0.27 gpm) and tube burst probability (< 4 x 10) obtained using the actual i measured voltages are more than two orders of magnitude below the allowable l Cycle 7B SLB leakage limit of 35.7 gpm and the NRC reporting guideline of 10 2 i for the tube burst probability.

7.2 Leak Rate and Tube Burst Probability for EOC-8 Calculations to predict the performance of the limiting steam generator in Byron Unit-1 at EOC-8 conditions were carried out using two values for POD: 1) NRC required constant value of 0.6,2) voltage dependent EPRI POD distribution. The methodology used in these predictions is the same as previously described for EOC-7B. Results of the EOC-8 predictions are summarized on Table 7-3. With a constant POD of 0.6, the projected limiting EOC-8 SLB leak rate is 19.0 gpm and it is predicted for SG C. Limiting tube burst probability, 9.4x10", is predicted for SG B which has largest number ofindications on the cold leg side. EPRI POD gives a slightly higher limiting burst probability,1.2x10'8, than POD =0.6. These limiting values are much lower than the allowable SLB leakage limit for Cycle 8 of 35.7 gpm and the NRC reporting guideline of10 for the tube burst probability.

1 SLB leak rates and tube burst probabilities predicted for EOC 8 are substantially  !

higher those for EOC 7B conditions due to the longer operating cycle and the EOC-

, 7B growth rates used in the projections are believed to be conservative, as  !

discussed in Section 3.2. The results based on the actual EOC-8 voltages are expected to be below these projections as was found for the EOC-7A condition (Reference 8.6).

s:\ ape \cae96\EoC7B90d.wp5 7-2

Table 7-1 Byron Unit 1 1995 EOC- 7B Outage Summary & Calculations dTube leak Rate and Burst Probability Based on Adual Bobbin Voltage - 250k Simulations Burst Probability SLB Steam Number Max. Leak

, Generator POD dIndi- - Volts (" 1 Tube 2 Tubes Rate cations gpm .

EOC - 7B ACTUAIS I

~

liot Side 1 1014 3.9 Negligible <2' Negligible <2' O.06 A Cold Side 1 9 1.1 < 4 x10' 6 < 4 x 10' ' 1x 10

Combined - 1023 3.9 < 4 x 10' ' < 4 x 10' ' O.06 Hot Side 1 1779 4.5 Negligible <2' Negligible <2' O.27 B Cold Side 1 12 1.2 < 4 x 10 ' < 4 x10 6 1 x 10

Combined - 1791 3.5 < 4 x 10' ' < 4 x 10' ' O.27 Hot Side 1 2035 3.5 Negligible <2' Negligible <2' O.13 C Cold Side 1 5 1.6 < 4 x 10' ' < 4 x 10' ' 1 x 10

3 Combined - 2040 3.2 < 4 x 10' ' < 4 x 10' ' O.13 Hot Side 1 859 3.5 Negligible <2' Negligible'2' O.04 D Cold Side 1 6 1.0 < 4 x 10' ' < 4 x 10' ' 1x 10

Combined -

865 3.5 < 4 x 10' ' < 4 x 10' ' O.04 Notes 1 Voltages include NDE uncertainties from Monte Carlo analyses and exceed measured voltages.

2 13elow 10 (Reference 8.7) s:\apc\cae96\EOC7B90d.wp5 73

l Tchle 7-2  ;

Byron Unit-1 l Summary of Projected Tube leak Rate and Burst Probability for EOC-7B - 250k Simulations Burst Probability SLB 1 Steam Na of Max. Leak l Generator POD Indio. Volts <23 1 Tube 2 Tubes Rate ations") gpm EOC - 7B PROJECTIONS BASED ON EOC-7A DATA "'

~

Hot Side 0.6 1436 3.9 Negligible (8) Negligible (8) 0.11 A Cold Side 4 0.6 5 0.8 < 4.0x10* < 4.0x10 1x10'

• Total 0.6 4 4 1441 - < 4.0x10 < 4.0x10 0.11 Hot Side EPRI 1321 3.6 Negligible ( Negligible (2) 0.07 A 4 Cold Side EPRI 5 0.8 < 4.0x10 < 4.0x10* 1 x 10-*

Total EPRI 1326 - < 4.0x10 4 < 4.0x10 4 0.07 Hot Side 0.6 2513 4.0 Negligible (8) Negligible (8) 0.25 0 4 Cold Side 0.6 4 1.5 < 4.0x10 < 4.0x 10* 1x10 4 Total 0.6 2517 -

< 4.0x 10* < 4.0x10 4 0.25 Hot Side EPRI 2285 3.9 Negligible (8) Negligible (8) 0.16 J Cold Side EPRI 3 1.4 < 4.0x10* < 4.0x10* 1x104 Total EPRI 2288 -

< 4.0x10 4 < 4.0x10' O.16 Hot Side 0.6 2606 3.9 Negligible (') Negligible (8) 0.21 C Cold Side 0.6 5 4 2 ~1 < 4.0x10 < 4.0x10 1 x 10'*

Total 0.6 4 4 2608 -

< 4.0x10 < 4.0x10 0 21 Hot Side EPRI 2360 3.8 Negligible ( ) Negligible (') O.14 i

C 4 Cold Side EPRI 2 ~1 < 4.0x10 < 4.0x10+ 1x10 4 l 1

( l Total EPRI 2362 -

< 4.0x10' < 4.0x10' O.14 i Hot Side 0.6 1245 3.9 Negligible (*) Negligible (8) 0.14 D Cold Side 0.6 -0.5 4

, 1 < 4.0x10 < 4.0x10* 1 x10-*

Total 0.6 1246 -

< 4.0x10' < 4.0x10* 0.14

, Hot Side EPRI 1186 3.7 Negligible (8) mgligible(') 0.01 Cold Side EPRI 4 2 0.5 < 4.0x10* < 4.0x10 1x10 4 Total EPRI 1188 - < 4.0x 10* < 4.0x10' O.01 Notes

.(1) Number of indications adjusted for POD.

(2) Voltages include NDE uncertainties from Monte Carlo analyses and exceed measured voltages.

(3) Below 10* (Reference 8.7)

(4) Based on a projected cycle 7B length of 116.1 EFPD (Actual Cycle 7B duration is 87.7 EFPD) s:\ ape \cae9G\EOC71190d.wp5 74

i Table 7-3 l Byron Unit-1 April 1996 Outage I Summary of Projected Tube Imak Rate and Burst Probability for EOC 250k Simulations Burst Probability SIE Steara Naof Max. Leak i Generater POD Indio. Volts <2) 1 Tube 2 Tubes Rate j ations") gpm EOC - 8 PROJECTIONS Hot Side 0.6 1618 11.1 Negligible (') Negligible (8) 9.7 A Cold Side 0.6 15 4.0 8.1x 10 < 4.0x10' O.05 Total 0.6 1633 -

8.1x10 d < 4.0x10' 9.8 Hot Side EPRI 1612 11.1 Negligible (8) Negligible (') 9.2 A

Cold Side EPRI 19 4.3 8.5x10 4 < 4.0x10' O.0G 4

Total EPRI -

8.5x10 < 4.0x10 9.2 Hot Side 0.6 2866 11.5 Negligible (8) Negligible (8) 17.0 0 Cold Side 0.6 19 4.3 9.4 x 10 < 4.0x10' O.07  !

Total 0.6 2885 -

9.4x10 4 < 4.0x10 4 17.1 Hot Side EPRI 2671 11.3 Negligible (" Negligible (') 14.8 i Cold Side EPRI 24 4.4 1.2x10'8 < 4.0x10 4 0.1 Total EPRI 4 2695 -

1.2x 10'8 < 4.0x10 14.9 Hot Side 0.6 3317 11.5 Negligible (3) Negligible ( ) 19.0 ,

C Cold Side 0.6 4 7 3.8 5.8x10 < 4.0x10* 0.04 Total 0.6 3324 -

5.8x 10 < 4.0x10 4 19.0 Hot Side EPRI 3109 11.4 Negligible (') Negligible (') 16.7 C

Cold Side EPRI 7 3.6 5.0x 10 < 4 0x10* 0.03 Total EPRI 3116 -

5.0x10 * < 4.0x10 16.7

~

Hot Side 0.6 1382 11.0 Negligible ( Negligible (8) 8.3 D Cold Side 0.6 9 3.4 4.5x 10 < 4.0x10* 0.02 I* Total 0.6 1391 -

4.5x 10 < 4.0x10 4 8.3 Hot Side EPRI 1452 10.9 Negligible (8) Negligible (8' 8.2 D

Cold Side EPRI 15 3.9 7.1 x 10 < 4.0x10' O 04 Total EPRI 1467 - 7.1x10 4 < 4.0x10' 8.3 Nati (1) Number ofindications adjusted for POD.

(2) Voltages include NDE uncertainties from Monte Carlo analyses and exceed measured voltages.

4 (3) Below 10 '(Reference 8.7) l l

s:\apcNcne96\EOC7890d wp5 7-5

i 8.0 References k

8.1 WCAP-14047, "Braidwood Unit 1 Technical Support for Cycle 5 Steam 4

Generator Interim Plugging Criteria", Westinghouse Nuclear Service

] - Division.

8.2 WCAP-14277, "SLB Leak Rate and Tube Burst Probability Analysis

< Methods for ODSCC at TSP Intersections", Westinghouse Nuclear 4

Services Division, Jan.1995.

s.

I 8.3 Westinghouse Report SG-95-01003, " Byron Unit-1 End-of Cycle 6 Interim

, Plugging Criteria Report," Westinghouse Nuclear Service Division, 1

4 January 1995.

8.4 NRC Generic Letter 95-05, " Voltage Based Repair Criteria for the hpair

of Westinghouse Steam Generator Tubes Affected by Outside Diameter Stress Corrosion Cracking," USNRC Office of Nuclear Reactor Regulation, t August 3,1995.

! 8.5 Westinghouse Report SG 96-03-001, " Byron Unit-1 End-of-Cycle 7A,

! Interim Plugging Criteria Report," Westinghouse Nuclear Service  !

1 Division, March 1996.

8.6 Westinghouse Report SG-96-06-006, " Byron Unit-1, Interim Plugging  !

Criteria Return to Power Report," Westinghouse Nuclear Service i Division, June 1996. )

8.7 WCAP-14273, " Technical Support for Alternate Plugging Criteria with  !

Tube Expansion at Tube Support Plate Intersections for Braidwood-1 and

- Byron-1 Model D Steam Generators," Westinghouse Nuclear Service  !

Division, February 1995.

e I

, 8.8 Letter from B. W. Sheron, Nuclear Regulatory Commission, to A. Marion, Nuclear Energy Institute, dated February 9,1996.

- 8.9 Letter from N. J. Liparulo, Westinghouse Electric Corporation, to W. T.  ;

Russel, Office of Nuclear Reactor Regulation, Nuclear Regulatory j Commission, CAW 96-935, dated February 28,1996, 1

?

a:\mpcNeae96\EoC7B90d.wp5 7-6