ML040220171
| ML040220171 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 01/15/2004 |
| From: | Lagergren W Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GL-95-005 SG-SGDA-03-44 | |
| Download: ML040220171 (74) | |
Text
Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 William R. Lagergren, Jr.
Site Vice President, Watts Bar Nuclear Plant JAN 15 2004 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D. C. 20555 Gentlemen:
In the Matter of
)
Docket No.50-390 Tennessee Valley Authority WATTS BAR NUCLEAR PLANT (WBN) UNIT 1 -
STEAM GENERATOR VOLTAGE BASED ALTERNATE REPAIR CRITERIA FOR AXIAL OUTSIDE DIAMETER STRESS CORROSION CRACKING (ODSCC) -
CYCLE 5 NINETY DAY REPORT The purpose of this letter is to provide NRC the Axial ODSCC Cycle 5 report entitled "Condition Monitoring and Operational Assessment:
GL 95-05 Alternate Repair Criterion End of Cycle 5," Report Number SG-SGDA-03-44, dated December 2003.
In accordance with the recommendations in Generic Letter 95-05, "Voltage-Based Repair Criteria for Westinghouse Steam Generator Tubes Affected by Outside Diameter Stress Corrosion Cracking,", Section 6.b, and TVA's commitment in an April 10, 2000, letter to NRC, Enclosure 1 provides the 90-day report from the end of the Cycle 5 outage.
Two tubes from Steam Generator 2 were removed and the metallurgical examinations on those tubes are being performed.
The report of these examinations is not complete.
- However, preliminary data from the burst test, leakage test and the morphology are provided in Enclosure 2. TVA's vendor expects to complete the examination by March 31, 2004.
TVA will provide the remaining information as soon as it becomes available.
AO~
Poedn racKIcd paW
U.S. Nuclear Regulatory Commission Page 2 7JAN 15 'nn provides the regulatory commitment from this letter.
If you have any questions about this report, please contact P. L. Pace at (423) 365-1824.
Sincerely,
. R. Lagergr n Enclosures
- 1.
Report Number SG-SGDA-03-44, Condition Monitoring and Operational Assessment:
GL 95-05 Alternate Repair Criterion End of Cycle 5
- 2.
Preliminary Results of Metallurgical Examination
- 3.
Commitment List cc (Enclosures):
NRC Resident Inspector Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381 Ms. Margaret H. Chernoff, Project Manager U.S. Nuclear Regulatory Commission MS 08G9 One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia 30303
ENCLOSURE 1 WATTS BAR NUCLEAR PLANT UNIT 1 CONDITION MONITORING AND OPERATIONAL ASSESSMENT:
GL 95-05 ALTERNATE REPAIR CRITERION END OF CYCLE 5 90-DAY REPORT
I SG-SGOA-3-.4, Rov.C Page of 63 Tenneswe Valley Authority Condition Monitoring and Operational Assessment:
GL-95-05 Alternate Repair Criterion End or Cycle 5 90 Day Report Watts Bar Unit 1 Report Number SG-SGDA-03-44 FINAL REPORT December, 2003 Authors Nanes Ketmcth R. Craig David 3. Ayres Signature / Date K.. h
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For Pages Wn*T M AI All
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All Verifier's Name P.R. Nelson Manager Name RJ. Sterdis I
Signature / Date 0<A XPrS For Pages All i
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SG-SGDA-03-44, Rev.0 Page 2 of 63 Table of Contents 0.0 Glossary of Acronyms.....................................................
3 1.0 Introduction.....................................................
4 2.0 Summary and Conclusions......................................................
4 3.0 EOC-5 Inspection Results...................................................
5 3.1 Voltage Distributions at EOC-5 3.2 Voltage Growth Rates for Cycle 5 4.0 Analysis Methods and Data Base for ARC Correlations 25 4.1 Tube Material Properties 4.2 Burst Correlation 4.3 Leak rate Correlation 4.4 Probability of Leak Correlation 5.3 NDE Uncertainties 5.4 Upper Voltage Repair Limit 5.0 Condition Monitoring: Tube Leak Rate and Burst Probabilities at EOC-5....................................................
30 5.1 Analysis Approach 5.2 EOC-5 Burst Probabilities and Leak Rates 5.3 Comparison with Acceptance Criteria and Prediction 6.0 Operational Assessment: Tube Leak Rates and Burst Probabilities at EOC-6....................................................
35 6.1 Analysis Approach 6.2 POD 6.3 Voltage Growth Rates for Cycle 6 6.4 Prediction of Voltage Distributions at EOC-6 6.5 Prediction of Tube Leak Rates and Burst Probabilities at EOC-6 6.6 Comparison with Acceptance Criteria 7.0 References....................................................
44 Appendix A Indication List
SG-SGDA-03-44, Rev.0 Page 3 of 63 0.0 Glossary of Acronyms BOC Beginning of operation cycle. The current inspection is just prior to BOC-6.
EOC End of operation cycle. The current inspection is at EOC-5. The end of the next cycle is EOC-6.
POD Probability of detection. This value is set equal to 0.60 for the GL-95-05 predictive analysis for the condition of the steam generators at the end of the next cycle.
ODSCC Outside diameter stress corrosion cracking SG Steam Generator identifier. Specifically SG 1, SG 2, SG3 and SG 4.
TSP Tube support plate. The Generic letter 95-05 Alternate Repair Criterion applies to ODSCC in the tubes at the TSPs
SG-SGDA-03-44, Rev.0 Page 4 of 63 1.0 Introduction Watts Bar Unit I completed the Cycle 5 of operation and subsequent steam generator tube inspection in October 2003. Axial ODSCC has been confirmed within the TSP regions of the steam generators and is a current degradation mechanism at Watts Bar Unit 1. The alternate repair criterion (ARC) defined in NRC Generic Letter 95-05 (Reference 1) is implemented at Watts Bar Unit 1. This report provides a condition monitoring assessment that demonstrates that the GL-95-05 acceptance criteria were satisfied at the end of operational Cycle 5 (EOC-5), and an operational assessment that demonstrates that the GL-95-05 acceptance criteria will continue to be satisfied throughout operational Cycle 6. A Watts Bar specific voltage growth rate was used in the EOC-6 prediction.
The operation cycle just completed, Cycle 5, was 516 Effective Full Power Days (EFPD). The next cycle, Cycle 6 is estimated to be 514 EFPD, Reference 2.
2.0 Summary and Conclusions Bobbin voltage indications of ODSCC at the tube support plates were detected and measured in all four steam generators. Based on this voltage distribution, using the methodology of References 1 and 3, a Condition Monitoring evaluation including the computation of the probability of tube burst (POB) and the amount of leakage predicted for steam line break conditions at EOC-5 was performed. The acceptance criteria on POB and leakage are satisfied with significant margin.
The change in voltage from the previous inspection was determined by historical review for each indication detected. The apparent voltage growth rate during cycle 5 was based on the historic review of 654 DSI indications identified during the Watts Bar Unit 1 EOC 5 inspection. An operational assessment prediction of the POB and leakage at steam line break conditions at EOC-6 was performed using a site specific bounding growth rate. The results indicate that the acceptance criteria on POB and leakage at EOC-6 will be satisfied with acceptable margin. Therefore the Reference 1 acceptance criteria will be satisfied throughout cycle 6.
SG-SGDA-03-44, Rev.0 Page 5 of 63 3.0 EOC-4 Inspection Results 3.1 Voltage Distributions at EOC-5 Summaries of eddy current signal voltage distributions at the drilled support plates, for each steam generator, are shown in Tables 3.1 through 3.4. Also shown are show the number of indications in each voltage range detected at EOC-5 and the number of indications removed from service due to tube repairs for any reason. The number of indications that remain in service for Cycle 6 is the difference between the number of indications detected and the number of indications removed from service. No tubes were unplugged with the intent to return them to service after inspection.
Appendix A contains a listing of all DSI indications and their repair status. All DSI indications with an EOC-5 voltage greater to or equal to 1 volt were subject to Plus Point inspections. Plugging repaired indications confirmed as being present by the Plus Point inspection.
The summary of all four-steam generators shows the following:
A total of 654 bobbin signals (DSls) were identified as ODSCC TSP indications during the inspection.
Of the 654 indications, 98 were above 1 volt.
- All indication with voltages greater than or equal to 1 volt, were subjected to an inspection with a Plus Point probe. Indications that confirmed during the Plus Point inspection were removed from service by plugging.
Of the 98 indications above 1 volt, 51 indications were repaired by plugging.
21 indications were removed from service for reasons other than ODSCC at the support plates Figures 3.1 through 3.4 illustrate the voltage distributions. Figures 3.1 a through 3.4a show the detected voltage distribution compared to the predicted distribution which was developed in the previous 90 Day report, Reference 4.
Figures 3.1 b through 3.4b show the distribution of repaired indications, and Figures 3.1 c through 3.4c show the distribution of indications that remain in service for the next operating cycle.
SG-SGDA-03-44, Rev.0 Page 6 of 63 Table 3.1 Inspection Results for SG I EOC-5 Voltage Bin Number of Indications MRPC Confirmed MRPCTested but not confirmed not MRPC tested Repaired Returned o service n service VIRPC confirmed r not tested 0.2 2__
0.2 13 ______1 1A 1
1A 11 0.4 31
__311 2_
21 29 0.5 34 2__
3A 2_
3A 30 0.q 39 4__
31 2_
3A 34 0.7 42 1
4__
3A 2__
41
-3 0.f 21 2__
is 1
2 if
- 0.
I I
_11 1
1q 1
_ 1 17_
1 7__
17 1
1.11 10 4__
6__
4__
6__
1.2 7
6 1
61___
1 1.2 3__
2__
1 A__
1 1.4 3__
1 2__
_1 21__
1.E 5__
3__
2__
1.q 1
_1 1.7 3__
3__
3__
1.e 2__
2__
2__
2.06 1
1 _
1 2.0 8 1
1 1
2.1 4 1
1 1
2.4 4 1
1 1
2.44 1
1 _
1 2.47 1
1 1 _
Totals 253 32 33 184 41 211 18 Average voltage = 0.720 volts
SG-SGDA-03-44, Rev.0 Page 7 of 63 Figure 3.1a Watts Bar EOC-5 Voltage Distribution, SG1 45 40 U,
c 0
0 I.-
So E
z 35 30 25 20 15 10 I
11 n
nn l3 Measured 0Predicted 5
0 o c
.~.
Volts
SG-SGDA-03-44, Rev.0 Page 8 of 63 Figure 3.1b Watts Bar EOC-5 Repaired Indications, SGI 0
a E
C
.0 z
7 6
5 4
3 2
1 0
C, to r-0 C')
to url 0) i-r N
CQi C'4 C' CM Voltage Figure 3.1c Watts Bar EOC-5 Indications Returned to Service, SG1
&0 0
C.
M4-.0 I-a)
.0 E
z 45 40 35 30 25 20 15 10 5
0 a
a a
a a
a Ia CDAll Returned to service E Conf. or not tested I I I I I 0
0 u
Co o)
C I
I I
I I
I I
I r-M cs-M r-Mn o
o r-r l-Volts
SG-SGDA-03-44, Rev.0 Page 9of63 Table 3.2 Inspection Results for SG 2 EOC-5
/oltage Bin Number of MRPC Indications IConfirmed MRPCTested but not confirmed not MRPC tested Repaired Returned to service n service MRPC confirmed r not tested 0.
_1 0.3 6
t 1
0.4 20 1
4 1c 1
1c 1E 0.5 14 1
1A C
14 1.
0.6 19 3
5 11 _
1 14 0.7 13 4
c i
1:
E
__18 2
3
- 1.
1_
1' 0.9 11 2
13 7
t 1'1 1.1
__4 1
4 1 C
- 1.
4_
1 3_
-C 1.t 2
1 1
1 C
1.8 1
1 1 _
C 1.0 1
1 __
10 1.i 1
1 1
C 1.7
_ 1 _ _
1 1
C 1.6 1
1 _
1 _ _
C 2.0 2 1
1 _
1 _ _
2.1 1
1 _ _
_1 2.45 1
1 1
C t
3.27 1
1 1 _
0 4.51 1
1 1 _
0 Totals 12S 21 30 71 1c 11_
84 Average voltage = 0.746 volts
SG-SGDA-03-44, Rev.0 Page 10 of 63 Figure 3.2a Watts Bar EOC-5 Voltage Distribufton, SG2 25 U) 0 00 a)
E z
20 15 10 5
n n n C!
LQ t-:C C
q c
)
-C~
n w
r--L 0
0 0D 0 0
C e~
N NCV VM M
j r
-r ll Measured E Preided 0
volts
SG-SGDA-03-44, Rev.0 Page 11 of 63 Figure 3.2b Watts Bar EOC-5 Repaired Indications, SG2 3
C I.
C
.0 Ez 2
1 0
C40 U
T-C~
X000F0 C) tfl U
C C!
ID
- 0)
N N
N C
M Volts M
In.
Figure 3.2c Watts Bar EOC-5 Indications Returned to Service, SG2 20 -
w 18
. 1 6 --
~14-12 60A
=
l b All Rteturned to service 0 8
~~~~~~~~~~~0 Conf. Or not tested 8-0 V
Volts
SG-SGDA-03-44, Rev.0 Page 12 of 63 Table 3.3 Inspection Results for SG 3 Voltage Bin Number of Indications MRPC Confirmed MRPCTested but not confirmed iot MRPC ested Repaired Returned to service in service MRPC confirmed or not tested 0.4 25 0__
4__
211 1
2A 2C 0.E 1 3 3__
1 1 1 1 I
0.E2 2
2C C2 2C 0.7 1 6 3__
1 1 E J__
0.
6 _ _
1 1
1.1 4__
1 1 _
C 1.E 1
0__
1 1
_ C 1.
4__
1 3__
1
_ C 2.q 1
1
_1
_ C 3.5 M 1
1 _
1 1
_ C Totals 1130 4
~
92 _
121 9C Average voltage = 0.683 volts
SG-SGDA-03-44, Rev.0 Page 13 of 63 Figure 3.3a Wats Bar EOC-5 Voltage Distrbution, SG3 30 -
25-0
,,20-C E] Measured 0 1l Prediction 10
.o 1 E
I Z 5.i 0-n LOO t-c ark P
VoTX 0_0 a
Volts
SG-SGDA-03-44, Rev.0 Page 14 of63 Figure 3.3b Watts Bar EOC-5 Repaired Indications, SG3 2
7cn
.2
_41 Li 0
.0 E
z 0,,.,.,1..1,,,
v-M~
L0 r-0 d
66 6
V-:
M r-a)
Vo Volts I-0 M
C-C 5
C6 Figure 3.3c Watts Bar EOC-5 Indications Returned to Service, SG3 30 25
.~20 C
D All Returned to
~15 o
service n 10 0
r 1
O Conf. Or not tested E
z 0~
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 Volts
SG-SGDA-03-44, Rev.0 Page 15 of 63 Table 3.4 Inspection Results for SG 4 Voltage Bin Number of MRPC Indications lConfirmed RPCTested cut not confirmed not MRPC tested Repaired Returned o service in service MRPC confirmed or not tested 0.~
7__
_1 0.A 11
_11110 E
0.A 17 4__
1A __
17 12 0.E 24 5__
1~ _ _
24 1E__
0.E 28 21__
20 1
27 25 0.7 17 11 __
17 12 1.1
___1 1 _
1 __
1. 2 1 _ _
1 _
1 _ _
1.
1 1
I__
C 1.4 1
4__
41_
C
- 1.
E 1
1
_1 C
1.E 1
0__
1 _ _
_ _1 0
1.7 1 1
1
_1 0
1.9 7
_ 1 __
1 1
C
~131 4___
311 1011 121 98 Average voltage = 0.605 volts
SG-SGDA-03-44, Rev.0 Page 16 of 63 Figure 3.4a
SG-SGDA-03-44, Rev.0 Page 17 of 63 Figure 3.4b Watts Bar EOC-5 Repaired Indications, SG4 2 --
-At u)
U, E
0 Volts Figure 3.4c Watts Bar EOC-5 Indications Returned to Service, SG4 30 25 -
0 All Returned to flu5 ES
~~~~~~~~~~~~~~Service 0 Conf. Or not tested 5
M 0-0.1 02 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 12 1.3 14 1.5 1.6 1.7 1.8 1.9 Z0 2.1 Volts
SG-SGDA-03-44, Rev.0 Page 18 of 63 3.2 Voltage Growth Rates for Cycle 5 Voltage growth was determined by the difference between the EOC-5 and EOC-4 voltages for each indication. The EOC-4 voltages were determined by historical reviews of the prior cycle data base and were established using the same techniques as used to analyze the EOC-5 data. The voltage change is for the 516 EFPD cycle length of cycle 5.
The voltage at EOC-4 is provided for each indication detected at EOC-5 in Appendix A. The procedure for computing the voltage change and binning the values is described in Reference 3. Negative voltage changes are included in the 0 change bin. Voltage change distributions for each steam generator are included in Tables 3.5 through 3.8. Since there were less than 200 voltage growth rate data points for each steam generator, a bounding EOC-5 specific growth rate distribution was used as defined in Table 3.9. A comparison of the steam generator specific growth rates and the EOC-5 bounding growth rate is shown in Figure 3.5.
SG-SGDA-03-44, Rev.0 Page 19 of 63 Table 3.5 Voltage Changes from EOC-4 to EOC-5 Steam Generator I 1
1 SG1 Change in volts Number of Cumulative Distribution Indications 0
77 0.304348 0.1 43 0.474308 0.2 34 0.608696 0.3 42 0.774704 0.4 17 0.841897 0.5 8
0.873518 0.6 4
0.889328 0.7 8
0.920949 0.8 3
0.932806 0.9 3
0.944664 1
3 0.956522 1.1 2
0.964427 1.2 3
0.976285 1.3 1
0.980237 1.4 2
0.988142 1.5 1
0.992095 1.6 0
0.992095 1.7 1
0.996047 1.8 0
0.996047 1.9 1
1 Total 253 Average change = growth / EOC-4 volts = 35%
SG-SGDA-03-44, Rev.0 Page 20 of 63 Table 3.6 Voltage Changes from EOC-4 to EOC-5 Steam Generator 2 SG2 Change in volts Number of Cumulative Distribution Indications 0
30 0.232558 0.1 22 0.403101 0.2 21 0.565891 0.3 17 0.697674 0.4 14 0.806202 0.5 8
0.868217 0.6 3
0.891473 0.7 2
0.906977 0.8 2
0.922481 0.9 0
0.922481 1
1 0.930233 1.1 3
0.953488 1.2 1
0.96124 1.3 1
0.968992 1.4 1
0.976744 2.1 0
0.976744 2.2 1
0.984496 2.3 1
0.992248 4
0 0.992248 4.1 1
1 Total 129 Average Change Average change = growth / EOC-4 volts = 52%
SG-SGDA-03-44, Rev.0 Page 21 of 63 Table 3.7 Voltage Changes from EOC-4 to EOC-5 Steam Generator 3 SG3 Change in volts Number of Cumulative Distribution Indications 0
50 0.367647 0.1 35 0.625 0.2 23 0.794118 0.3 10 0.867647 0.4 8
0.926471 0.5 5
0.963235 0.9 0
0.963235 1
2 0.977941 1.4 0
0.977941 1.5 1
0.985294 1.6 1
0.992647 2.6 0
0.992647 2.7 1
1 Total 136 Average change = growth / EOC-4 volts = 7%
SG-SGDA-03-44, Rev.0 Page 22 of 63 Table 3.8 Voltage Changes from EOC-4 to EOC-5 Steam Generator 4 SG4 Change in volts Number of Cumulative Distribution Indications 0
55 0.404412 0.1 35 0.661765 0.2 22 0.823529 0.3 11 0.904412 0.4 9
0.970588 0.5 2
0.985294 0.6 0
0.985294 0.7 0
0.985294 0.8 0
0.985294 0.9 1
0.992647 1
0 0.992647 1.1 0
0.992647 1.2 0
0.992647 1.3 1
1 Total 136 Average Change Average change = growth / EOC-4 volts = 5%
SG-SGDA-03-44, Rev.0 Page 23 of 63 Table 3.9 Voltage Changes from EOC-4 to EOC-5 Bound of All Steam Generators Change in volts Bounding Cumulative Distribution 0
0.232558 0.1 0.403101 0.2 0.565891 0.3 0.697674 0.4 0.806202 0.5 0.868217 0.6 0.889328 0.7 0.906977 0.8 0.922481 0.9 0.922481 1
0.930233 1.1 0.953488 1.2 0.96124 1.3 0.968992 1.4 0.976744 2.1 0.976744 2.2 0.984496 2.3 0.992248 4
0.992248 4.1 1
SG-SGDA-03-44, Rev.0 Page 24 of 63 Figure 3.5a Watts Bar Voltage Growth per Cycle 5 1 - ;;.
- -ashy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~............................,-,
0.6
- S G 1
-SG2 D °.5
-'-.SG3 0.4
<^~G
-0.
Bound 0.3 0.2 0
1 2
3 4
5 Change in Volts Figure 3.5b Watts Bar Voltage Growth Detail 1
s o
~
A 0.99 0.98 SG2 I;0.987 S.VsG 4
0.97 It.Ar-SG4
--. -Bound 0.96 0.95 0
1 2
3 4
5 Change in Volts
SG-SGDA-03-44, Rev.0 Page 25 of 63 4.0 Analysis Methods and Data Base for ARC Correlations Westinghouse has developed a Monte Carlo based computer program to perform the calculations prescribed in GL 95-05 (Reference 1). The methodology for predicting the EOC voltage distribution and computing the probability of burst and leakage at accident conditions is based on the Westinghouse Topical Report, WCAP-14277, Revision 1 (Reference 3).
The current data for burst and leakage correlations are included in Addendum 5 to EPRI Report NP-7480-L (Reference 5). The specific parameters used in the correlations are provided in Sections 4.1 through 4.4.
4.1 Tube Material Properties The tube material properties are provided in Reference 3 (Table 4-1) for 3/4-inch diameter tubes at 650F. The parameters used in the analysis are the flow stress mean of 71.565 Ksi and the flow stress standard deviation of 3.567 Ksi.
SG-SGDA-03-44, Rev.0 Page 26 of 63 4.2 Burst Correlation The burst pressure, Pb, is normalized to a material with a flow stress of 71.565 ksi, that is the mean of the 3/4-inch tube data appropriate for Watts Bar Unit 1. The correlation parameters are taken from Reference 5.
Table 4.1 Burst Correlation Pb = aO + al Log(Volts)
Parameter Addendum 5 Database Intercept, aO 7.4605 Slope, al
-2.9572 Standard error 0.9009 Mean of log(V) 0.3994 SS log(V) 37.2648 Number data points 98 Structural Limit ( 2405 psi) 5.67 V
SG-SGDA-03-44, Rev.0 Page 27 of 63 4.3 Leak Rate Correlation The leak rate correlation as a function of indication voltage is taken from Reference 5. The steam line break pressure is given as 2355 psi in Reference 2. Therefore the leak correlation for pressure of 2405 psi from Reference 5 is used for the leakage predictions.
The leak rate criterion is given in terms of gallons per minute condensed at room temperature.
Table 4.2 Leak Rate Correlation Log(Q) = b3 + b4 Log(Volts)
Parameter Addendum 5 Database b3
-1.87084 b4 2.97669 Standard error 0.59791 Mean log(V) 0.921007 SS Iog(V) 3.134826 Number data pairs 48
SG-SGDA-03-44, Rev.0 Page 28 of 63 4.4 Probability of Leak Correlation The probability of leak as a function of indication voltage is taken from Reference 5. In the Monte Carlo analysis leakage is quantified only if the indication is computed be a leaker, based on the probability of leak correlation.
Table 4.3 Probability of Leak Correlation Pr(Leak) = 11{1+ eA[bl + b2 Log(Volts)]}
Parameter Addendum 5 Database Logistic intercept, bl
-4.8270 Logistic slope, b2 8.4488 Intercept Variance, V11 1.1623 Covariance, V12
-1.7094 Slope of Variance, V22 2.8755 Number of Data 125 4.5 NDE Uncertainties The NDE uncertainties applied for the EOC-5 and EOC-6 voltage projections are the same as used in the previous 90 Day report, Reference 4, and described in Reference 3. The probe wear uncertainty has a standard deviation of 7% 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 distributions are used in the Monte Carlo analysis to predict the burst probabilities and accident leak rates at EOC-5, and EOC-6. The voltages reported were adjusted to account for differences between the laboratory standard and the standard used in the field.
SG-SGDA-03-44, Rev.0 Page 29 of 63 4.6 Upper Voltage Repair Limit The upper voltage repair limit is based on the structural limit in Table 4.1 of 5.67 volts for accident pressure of 2405 psi. It must be reduced by considering the projected voltage growth during the next cycle and NDE uncertainty. The maximum average percentage growth rate for any steam generator is seen from Table 3.6 (SG2) to be 52% per 516 day cycle 5.
According to Reference 1, the minimum growth adjustment is 30% per EFPY (42.4% per cycle for the anticipated 514 EFPD cycle 6). Therefore the specific maximum value of 52% x (514/516) = 52% and 20% for NDE uncertainty will be used to estimate the voltage repair limit. This results in an upper voltage repair limit of 5.67/ (1. + 0.52 + 0.20) = 3.3 volts. No indications equal to or greater than this voltage were left in service.
SG-SGDA-03-44, Rev.0 Page 30 of 63 5.0 Condition Monitoring:
Tube Leak Rate and Burst Probabilities at EOC-5 5.1 Analysis Approach The measured EOC-5 voltage distributions of Table 3.1 through 3.4 for each steam generator are used as the basis for the leak rate and burst probability predictions for EOC-5. The voltage distributions developed for the computation of POB and leakage consider NDE uncertainty on the measured values, but consider no voltage growth. The resulting voltage distributions used for computation of the probability of burst and leakage are given in Figures 5.1 through 5.4.
Figure 5.1 EOC-5 Voltage Distribution with NDE Uncertainty, SG1 40 -
35 30 25-
- 2O 20-1..
E Ad 10 15 Volts
SG-SGDA-03-44, Rev.0 Page 31 of 63 Figure 5.2 Figure 5.3 EOC-5 Voltage Distribution with NDE Uncertainty, SG3 25 -
U,
=0 20l -i0l nnnnr E 5 i-z Volts
SG-SGDA-03-44, Rev.0 Page 32 of 63 Figure 5.4 EOC-5 Voltage Distribution with NDE Uncertainty, SG4 25 r-20
- 515 0%..10 CD E
z 0
N~~~~~~~~~~~~~~~~~1 Volts
SG-SGDA-03-44, Rev.0 Page 33 of 63 5.2 EOC-5 Burst Probabilities and Leak Rates The Monte Carlo analysis results for each of the steam generators based on the measured voltage distribution at EOC-5 are shown in Table 5.1. The analysis program inputs and outputs are detailed in Reference 6. Two hundred and fifty thousand Monte Carlo trials were performed for each steam generator. The leakage rate is the 95th percentile evaluated at 95%
confidence. The burst probability is 95% confidence based on the number of trials.
Table 5.1 Analysis Results for EOC-5 Voltage Distributions with NDE Uncertainty SG Number of Number of Maximum Burst Probability 95/95 SLB Monte Indications Volts 95% conf.
Leak Rate, gpm Carlo Trials Measured 1
250,000 253 2.47 2.13 x 10A-4 0.0152 2
250,000 129 4.51 7.81 x 1OA-4 0.0599 3
250,000 136 3.53 2.71 x 10A-4 0.0232 4
250,000 136 1.98 3.66 x 10A-5 0.0036 Table 5.2 Predicted Results from Reference 4 SG Number of Number of Maximum Burst Probability 95195 SLB Monte Indications Volts 95% conf.
Leak Rate, gpm Carlo Trials 1
250,000 80 8.7 7.79 x 10A-3 0.419 2
250,000 46.67 7.6 5.03 x 1OA-3 0.270 3
250,000 50.67 7.6 5.06x 10A-3 0.267 4
250,000 63 8.2 6.34 x 10A-3 0.345
SG-SGDA-03-44, Rev.0 Page 34 of 63 5.3 Comparison with Acceptance Criteria and Prediction All steam generators are well below the burst acceptance criterion of 1.0 x 10 -2, and the Watts Bar Unit 1 leakage criterion of 1.0 gpm per steam generator. The acceptance criteria on POB and leakage are satisfied with significant margin.
The predicted values of the maximum voltage, probability of burst, and leakage were conservative because they were based on a very conservative industry voltage growth rate in Reference 4. The number of indications, however was underpredicted. This could be because EOC-4 was the first implementation of GL-95-05 and the indications were small and not as easily detectable at EOC-4.
N1 SG-SGDA-03-44, Rev.0 Page 35 of 63 6.0 Operational Assessment:
Tube Leak Rate and Burst Probabilities at EOC-6 6.1 Analysis Approach The BOC-6 voltage distributions is developed, within the Cyclesim3.1 program, from the measured EOC-5 distribution by considering the POD and the indications that are removed from service. The EOC-6 voltage distribution is developed considering the NDE uncertainties and voltage growth during the cycle. The latest burst and leakage correlations, Reference 5, are used for the EOC-6 predictions. The burst probabilities and leak rates are computed using the computed EOC-6 voltage predictions to address the acceptance criteria at the end of the cycle.
6.2 POD The POD used is the NRC accepted value of 0.6 for all voltages (Reference 1).
The beginning of cycle 6 ( BOC-6) voltage distributions are shown in Table 6.1
SG-SGDA-03-44, Rev.0 Page 36 of 63 Table 6.1 BOC-6 Voltage Distributions Volts Bin SG1 SG2 SG3 SG4 0.1 0
0 0
0 0.2 3.33 3.33 8.33 10.67 0.3 20.67 9
13.33 17.33 0.4 49.67 32.33 40.67 28.33 0.5 54.67 23.33 21.67 40 0.6 63 31.67 36.67 45.67 0.7 68 20.67 26.67 28.33 0.8 34 30 20.67 15 0.9 17.33 18.33 10.67 8.33 1
28.33 8.33 9
1.67 1.1 12.67 7.33 5.67 0.67 1.2 5.67 5.67 8.33 1.67 1.3 3
2.33 5
0.67 1.4 4
0.67 3.33 7.33 1.5 5.33 0.67 1.67 1.67 1.6 3.67 0.67 0
1.67 1.7 2
1.67 0
0.67 1.8 1.33 0.67 5.67 0
1.9 0
0 0
0 2
0 0.67 0
2.33 2.1 2
0.67 0
0 2.2 0
0 0
0 2.3 0
0 0
0 2.4 1.33 0
0 0
2.5 0.67 0.67 0
0 2.6 0
0 0.67 0
2.7 0
0 0
0 2.8 0
0 0
0 2.9 0
0 0
0 3
0 0
0 0
3.1 0
0 0
0 3.2 0
0 0
0 3.3 0
0.67 0
0 3.4 0
0 0
0 3.5 0
0 0.67 0
3.6 0
0 0
0 4.4 0
0 0
0 4.5 0
0.67 0
0 4.6 0
0 0
0
SG-SGDA-03-44, Rev.0 Page 37 of 63 6.3 Voltage Growth Rates for Cycle 6 The bounding voltage growth rate, Table 3.9, was used for the Cycle 6 analysis.
6.4 Prediction of Voltage Distributions at EOC-6 The prediction of the EOC-6 voltage distributions is based on the BOC-6 indications and the composite growth rate. The length of cycle 6 is established at 514 effective full power days (EFPD), Reference 2. The EOC-6 predicted voltage distributions are shown in Table 6.2 and in Figures 6.1 through 6.4. The analysis inputs and outputs are detailed in Reference 6.
Table 6.2 Predicted EOC-6 Voltage Distributions Volts Bin SG1 SG2 SG3 SG4 0.1 0.04 0.04 0.09 0.12 0.2 1.16 0.9 2.03 2.61 0.3 6.25 3.42 5.42 6.19 0.4 15.61 9.01 12.03 11.73 0.5 25.39 13.34 16.22 18.49 0.6 35.04 17.34 20.58 24.13 0.7 41.46 20.04 22.76 26.05 0.8 42.31 21.49 22.56 24.66 0.9 39.23 20.57 20.19 21.13 1
34.14 17.96 16.91 16.51 1.1 28.02 14.95 13.75 11.75 1.2 21.64 11.94 10.97 8.06 1.3 16.31 9.16 8.82 5.86 1.4 12.75 7.01 7.39 4.66 1.5 10.3 5.57 6.4 4.19 1.6 8.48 4.42 5.39 4.08 1.7 7.31 3.6 4.65 3.81 1.8 6.16 2.98 3.9 3.31 1.9 4.87 2.43 3.11 2.67 2
3.76 1.93 2.43 2
2.1 2.84 1.48 1.85 1.4 2.2 2.06 1.13 1.37 0.98 2.3 1.52 0.84 1.03 0.69
SG-SGDA-03-44, Rev.0 Page 38 of 63 2.4 1.2 0.66 0.84 0.61 2.5 1.14 0.6 0.78 0.62 Volts Bin SG1 SG2 SG3 SG4 2.6 1.28 0.67 0.83 0.68 2.7 1.38 0.69 0.8 0.77 2.8 1.37 0.63 0.7 0.78 2.9 1.25 0.58 0.63 0.63 3
0.97 0.52 0.5 0.42 3.1 0.68 0.43 0.37 0.24 3.2 0.5 0.32 0.27 0.13 3.3 0.36 0.23 0.21 0.07 3.4 0.25 0.18 0.18 0.05 3.5 0.17 0.15 0.16 0.04 3.6 0.12 0.12 0.14 0.05 3.7 0.1 0.1 0.12 0.04 3.8 0.08 0.08 0.1 0.04 3.9 0.06 0.07 0.09 0.03 4
0.04 0.07 0.07 0.02 4.1 0.03 0.06 0.06 0.01 4.2 0.02 0.06 0.06 0.02 4.3 0.07 0.09.
0.11 0.1 4.4 0.22 0.17 0.19 0.16 4.5 0.39 0.27 0.28 0.24 4.6 0.45 0.26 0.24 0.15 4.7 0.48 0.26 0.06 0
4.8 0.41 0.17 0
0.7 4.9 0
0 0.7 0
5 0
0 0
0.3 5.1 0.7 0.7 0
0 5.2 0
0 0.3 0
5.3 0.3 0
0 0
5.4 0
0.3 0
0 5.5 0
0
SG-SGDA-03-44, Rev.0 Page 39 of 63 Figure 6.1 EOC-6 Predicted Voltage Distribution, SGI 45-40-a 35-0 C.2
~25-0 20
.o 15 E
10 5
n W of 6, 1o e
- Volts 4
Volts
SG-SGDA-03-44, Rev.0 Page 40 of 63 Figure 6.2 EOC-6 Predicted Voltage Distribution, SG2 25 -
in 20-C
.2 E~~~~~~~~~~~~~~~~~~~~~
Z 5 II..
... I. I I..
. A V
Volts
SG-SGDA-03-44, Rev.0 Page 41 of 63 Figure 6.3 EOC-6 Predicted Voltage Distribution, SG3 2 5..........................-- ----------- --...............................
g 20 0
'1 15 0
10
. 1 0 X 1
-5 i
lZ~ l;~ l~ ll l1 N,1l],1 ltHn~~
n1 n1 4n n
b n
0
_~ _~
.0 o
fp 9e u?.P'yn a
t°b 9A Volts
SG-SGDA-03-44, Rev.0 Page 42 of 63 Figure 6.4
SG-SGDA-03-44, Rev.0 Page 43 of 63 6.5 Prediction of Tube Leak Rates and Burst Probabilities at EOC-6 The Monte Carlo analysis results for predicted EOC-5 voltage distributions are shown in Table 6.3. Two hundred and fifty thousand Monte Carlo trials were performed for each steam generator in this operational assessment.
The leakage rate is the 9 5 th percentile evaluated at 95% confidence. The burst probability is 95% confidence based on the number of trials. The analysis program inputs and outputs are detailed in Reference 6.
Table 6.3 EOC-6 Predicted Results SG Number of Number of Maximum Burst Probability 95/95 SLB Monte Indications Volts*
95% conf.
Leak Rate, gpm Carlo Trials 1
250,000 380.7 5.3 2.34 x 10A-3 0.175 2
250,000 200 5.4 1.98 x 10A-3 0.143 3
250,000 218.7 5.2 1.63 x 1OA-3 0.124 4
250,000 212 5.0 1.10 x I OA-3 0.099
- Voltage where tail is accumulated to 0.3 volts 6.6 Comparison with Acceptance Criteria All steam generators are below the burst acceptance criterion of 1.0 x 10A2, and the Watts Bar Unit 1 leakage criterion of 1.0 gpm.
SG-SGDA-03-44, Rev.0 Page 44 of 63 7.0 References
- 1. NRC Generic Letter 95-05. "Voltage-Based Repair Criteria for Westinghouse Steam Generator Tubes Affected by Outside Diameter Stress Corrosion Cracking", USNRC Office of Nuclear Reactor Regulation, August 3, 1995.
- 2. TVA Letter, Helms to Cothron, "Watts Bar Nuclear Plant (WBN)-U1 C5 Steam Generator Tube Integrity Inspection, " dated September 12, 2003.
- 3. WCAP-14277, Revision 1, "SLB Leak Rate and Tube Burst Probability Analysis Methods for ODSCC at TSP Intersections," Westinghouse Nuclear Services Division, December 1996.
- 4. Westinghouse Report SG-SGDA-02-13, Rev.0, "Condition Monitoring and Operational Assessment: GL 95-05 Alternate Repair Criterion End of Cycle 4 90 Day Report, Watts Bar Unit 1", May 2002
- 5. EPRI Report NP-7480-L, Addendum 5,2002 Database Update, "Steam Generator Outside Diameter Stress Corrosion Cracking at Tube Support Plates - Database for Alternate Repair Criteria," October 2002.
6 Westinghouse Calculation CN-SGDA-03-122, Rev. 0, "Watts Bar EOC-5 GL 95-05 Analyses, December 2003.
SG-SGDA-03-44, Rev.0 Page 45 of 63 Appendix A Indication List Watts Bar Unit 1 GL-95-05 End of Cycle 5 Sorted by EOC-5 Voltage Steam Generator 1 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 9
42 y
DSI H03 0.12 2.47 0.63 8
10 V
DSI H03
-0.11 2.44 1.31 10 48 y
DSI H03 0.03 2.44 1.48 11 72 y
DSI H03 0.09 2.14 0.49 5
67 V
DSI H02 0.09 2.08 0.69 3
47 y
DSI H03
-0.06 2.06 0.63 9
51 y
DSI H03 0.03 1.75 0.38 9
74 y
DSI H03 0.17 1.75 0.59 9
71 y
DSI H03 0.14 1.65 0.46 10 49 y
DSI H03 0.12 1.65 0.43 37 34 Y
DSI H02 0.03 1.61 1.3 8
71 V
DSI H02
-0.03 1.57 0.57 8
71 Y
DSI H03 0.09 1.57 0.51 13 7
DSI H04 0.12 1.57 1.44 11 99 v
DSI H02 0.09 1.56 0.83 5
20 V
DSI H02 0.06 1.48 1.09 12 2
DSI H02 0.09 1.48 1.38 7
20 V
DSII H03 0
1.42 0.57 8
65 Y
DSI H03 0.06 1.42 0.41 17 36 DSI H02 0.09 1.42 1.14 4
88 V
DSI H03 0
1.39 1.08 32 63 DSI H02 0.32 1.36 1.09 6
93 DSI H02
-0.09 1.32 1.11 6
94 DSI H04 0
1.29 0.5 7
10 V
DSI H03 0
1.23 0.26 4
62 v
DSI H03 0.06 1.22 0.45 3
49 y
DSI H03
-0.06 1.18 1.23 46 41 DSI H02 0.23 1.16 0.28 4
55 V
DSI H03 0
1.15 1.01 11 70 y
DSI H03
-0.06 1.15 0.53
SG-SGDA-03-44, Rev.0 Page 46 of 63 Steam Generator l ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 10 48 y
DSI H04 0.17 1.14 0.74 3
46 Y
DSI H03
-0.03 1.13 0.92 21 29 y
DSI H02 0.15 1.12 0.52 3
57 DSI C14 0.03 1.07 0.94 5
90 DSI H02 0.2 1.06 1.08 11 72 y
DSI H02 0.09 1.06 0.38 17 6
DSI H03 0.12 1.05 0.18 5
9 DSI H03 0
1.04 0.77 6
82 DSI H04
-0.06 1.04 0.69 6
96 Y
DSI H03
-0.09 1.04 0.62 3
52 y
DSI H02 0.17 1.03 0.8 26 71 DSI H03 0.29 1.03 0.36 5
63 y
DSI H03
-0.06 1.02 0.39 5
78 DSI H02 0.09 0.99 0.88 8
19 DSI H03 0
0.99 0.3 7
11 DSI H02 0.17 0.98 0.68 11 33 DSI H02 0.12 0.98 0.91 4
1 DSI H02
-0.06 0.97 0.66 6
94 DSI H02
-0.11 0.97 0.99 5
17 DSI H02 0.14 0.96 0.77 6
82 DSI H02 0.14 0.96 0.87 37 98 DSI H02 0
0.96 0.64 4
78 DSI H02
-0.03 0.95 0.68 7
9 DSI H02 0.12 0.95 0.57 8
46 DSI H03
-0.03 0.95 1.02 7
12 DSI H02 0.17 0.94 1.18 9
54 DSI H05 0.09 0.94 0.83 3
102 DSI H03 0.03 0.91 0.86 5
86 DSI H04
-0.08 0.91 0.72 42 39 DSI H02
-0.03 0.91 0.59 3
7 DSI H03
-0.15 0.89 0.54 5
11 DSI H03
-0.03 0.87 0.44 8
69 DSI H03
-0.06 0.86 0.24 7
63 DSI H03
-0.03 0.85 0.54 5
9 DSI H02 0.18 0.84 0.28 4
63 DSI H03 0.06 0.83 0.32 9
52 DSI H02
-0.09 0.83 0.42 5
24 DSI H02
-0.09 0.82 1.02 6
8 DSI H02
-0.06 0.82 0.6 10 48 y
DSI H05
-0.06 0.82 0.57
SG-SGDA-03-44, Rev.0 Page 47 of 63 Qtorm (rDnaratnr 1
ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 8
43 DSI H03 0.06 0.81 0.67 3
19 DSI H03
-0.2 0.8 0.89 25 35 DSI H02 0
0.78 0.11 5
94 DSI H02 0
0.77 0.3 18 18 Y
DSI H02 0.21 0.77 0.84 6
94 DSI H03 0
0.76 0.89 8
8 DSI H03
-0.06 0.76 0.59 8
108 DSI H05 0
0.75 0.76 18 65 DSI H04 0.12 0.75 0.63 2
2 DSI H02
-0.08 0.74 0.86 2
111
____i DSI H04 0
0.74 0.63 3
67 DSI H02 0.15 0.74 0.42 22 30 DSI H03 0.06 0.74 0.11 1
6 D DSI H03 0.08 0.73 0.44 6
63 DSI H06 0.15 0.73 0.55 5
94 DSI H04 0
0.72 0.65 6
3 DSI H03 0.03 0.72 0.58 6
60 DSI H03 0.06 0.72 0.6 14 39 DSI H04 0.09 0.72 0.99 3
61 DSI H03 0.15 0.71 0.47 7
103 DSI H03
-0.06 0.71 0.31 11 71 DSI H03 0.12 0.71 0.5 3
63 DSI H03 0.09 0.7 0.29 6
66 DSI H03 0.03 0.7 0.47 6
67 DSI H03 0.09 0.7 0.22 7
106 DSI H05 0
0.7 0.44 13 91 DSI H02 0
0.7 0.75 1
59 DSI H03 0.09 0.69 0.47 3
67 DSI H03 0.06 0.69 0.37 5
92 DSI H02
-0.14 0.69 0.7 6
15 DSI H02 0.06 0.69 0.34 7
19 DSI H02
-0.08 0.69 0.18 9
13 DSI H04 0.03 0.69 0.52 4
109 DSI H08 0.03 0.68 0.68 5
19 DSI H02 0
0.68 0.41 10 49 y
DSI H05 0
0.68 0.48 15 37 DSI H04 0
0.68 0.64 19 81 DSI H03 0.09 0.68 0.46 10 18 DSI H02 0.15 0.67 0.61 34 24 DSI H02 0.15 0.67 0.62
SG-SGDA-03-44, Rev.0 Page 48 of 63 Steam Generator 1 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 39 74 DSI H02 0.32 0.67 0.43 5
12 DSI H02 0
0.66 0.39 5
27 DSI H08
-0.09 0.66 0.79 5
46 DSI H03
-0.09 0.66 0.55 21 79 DSI H02 0.12 0.66 0.63 8
91 DSI H02
-0.03 0.65 0.57 48 70 DSI H02 0.03 0.65 0.44 3
51 DSI H04 0
0.64 0.54 3
59 DSI H02 0.03 0.64 0.36 6
37 DSI H03 0.03 0.64 0.36 3
69 DSI H03 0
0.63 0.33 4
88 V
DSI H02 0.14 0.63 0.48 4
90 DSI H02 0.2 0.63 0.14 5
11 DSI H02
-0.03 0.63 0.34 5
23 DSI H02 0.2 0.63 1.14 8
52 DSI H03 0
0.63 0.64 11 44 DSI H02 0.06 0.63 0.48 5
44 DSI H03 0
0.62 0.66 6
41 DSI H03
-0.06 0.62 0.36 9
46 DSI H03 0.12 0.62 0.6 12 72 DSI H02 0.03 0.62 0.33 5
53 DSI H03
-0.09 0.61 0.32 6
110 DSI H05 0
0.61 0.3 17 72 DSI H05
-0.3 0.61 0.36 7
108 DSI H04
-0.09 0.6 0.52 7
108 DSI H05 0.03 0.6 0.58 9
47 DSI H04 0.17 0.6 0.56 11 38 DSI H04 0.12 0.6 0.64 3
102 DSI H02 0.23 0.59 0.66 6
101 DSI H04 0.03 0.59 0.59 7
7 DSI H03
-0.12 0.59 0.57 7
59 DSI H04 0.03 0.59 0.36 7
104 DSI H04 0.14 0.59 0.71 15 37 DSI H05 0.03 0.59 0.72 37 63 y
DSI H03 0.32 0.59 0.51 2
4 DSI H03
-0.06 0.58 0.51 6
46 DSI H03 0.03 0.58 0.36 7
65 DSI H03 0.06 0.57 0.36 8
42 DSI H03 0
0.57 0.4 8
89 DSI H04
-0.11 0.57 0.63
SG-SGDA-03-44, Rev.0 Page 49 of 63 Steam Generator 1 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 37 71 DSI H03
-0.18 0.57 0.69 4
51 DSI H04
-0.06 0.56 0.35 3
61 DSI H06 0.03 0.55 0.33 5
7 DSI H02 0
0.55 0.46 5
18 DSI H02 0.06 0.55 0.69 5
92
.DSI H04
-0.11 0.55 0.72 11 33 DSI H03
-0.09 0.55 0.57 3
47 y
DSI H02
-0.03 0.54 0.35 5
73 DSI H03
-0.06 0.54 0.2 8
51 DSI H04
-0.06 0.54 0.38 10 65 DSI H03 0
0.54 0.87 3
69 DSI H02
-0.03 0.53 0.34 5
24 DSI H03 0.11 0.53 0.56 5
61 DSI H03 0
0.53 0.4 6
63 DSI H03 0.03 0.53 0.46 7
8 DSI H03
-0.06 0.53 0.85 8
34 DSI H02 0.14 0.53 0.56 40 86 DSI H03
-0.09 0.53 0.12 3
51 DSI H02 0.06 0.52 0.51 5
42 DSI H03 0
0.52 0.25 7
11 DSI H03 0
0.52 0.27 19 100 DSI H02 0.06 0.52 0.24 8
64 DSI H04
-0.06 0.51 0.4 7
15 DSI H04
-0.09 0.5 0.29 5
27 DSI H03 0
0.49 0.78 6
99 DSI H05 0
0.49 0.44 7
76 DSI H04
-0.03 0.49 0.42 10 107 DSI H04 0.06 0.49 0.46 7
8 DSI H02
-0.06 0.48 0.45 9
9 DSI H05 0.06 0.48 0.52 3
57 DSI H04 0
0.47 0.35 3
65 DSI H03 0.15 0.47 0.29 3
90 DSI H02 0.06 0.47 0.48 6
77 DSI H07
-0.03 0.47 0.31 8
25 DSI H05 0.06 0.47 0.73 22 73 DSI H04 0.12 0.47 0.25 3
97 DSI H03 0
0.46 0.49 8
104 DSI H05 0
0.46 0.54 4
27 DSI H03 0
0.45 0.7 5
29 DSI H04 0.03 0.45 0.53
SG-SGDA-0344, Rev.0 Page 50 of 63 Steam Generator 1 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 5
55 DSI H03
-0.06 0.45 0.45 1
31 DSI H08 0
0.44 0.56 5
1 DSI H02
-0.03 0.44 0.28 6
40 DSI H03
-0.09 0.44 0.15 6
65 DSI H03 0.15 0.44 0.27 7
50 DSI H03 0.03 0.44 0.4 7
59 DSI H02 0
0.44 0.39 9
20 DSI H05 0.06 0.44 0.34 13 37 y
DSI H02 0.06 0.44 0.42 13 67 DSI H03 0.12 0.44 0.4 17 54 DSI H04 0.06 0.44 0.4 5
15 DSI H05 0.06 0.42 0.45 3
47 V
DSI H06 0.09 0.41 0.43 5
48 DS I H07 0.06 0.41 0.3 6
84 DSI H02 0
0.41 0.31 8
89 DSI H05 0.14 0.41 0.36 31 21 DSI H03
-0.03 0.41 0.19 3
54 DSI H07
-0.03 0.4 0.43 5
71 DSI H03 0
0.4 0.19 6
104 DSI H08 0
0.4 0.36 7
21 DSI H08
-0.06 0.4 0.32 34 99 DSI H02 0.06 0.4 0.44 12 94 y
DSI H03 0
0.39 0.42 16 39 DSI H03
-0.15 0.38 0.68 18 74 DSI H06
-0.06 0.38 0.31 3
59 DSI H04 0.03 0.37 0.25 5
92 DSI H03
-0.17 0.37 0.69 5
37 DSI H02
-0.06 0.36 0.52 8
109 DSI H02
-0.06 0.36 0.31 9
9 DSI H02 0.03 0.36 0.26 9
47 DSI H02 0.03 0.36 0.4 4
28 DSI H02
-0.2 0.35 0.88 4
69 DSI H02 0.03 0.35 0.47 6
56 DSI H03 0.09 0.35 1.01 7
62 DSI H08 0.03 0.35 0.18 12 93 DSI H02
-0.03 0.35 0.55 20 59 DSI H08 0.09 0.35 0.25 35 48 DSI H02 0.09 0.35 0.22 7
108 DSI H03 0.06 0.34 0.39 3
24 DSI H03
-0.09 0.33 0.34
SG-SGDA-03-44, Rev.0 Page 51 of 63 Steam Generator 1 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 3
72 DSI H03
-0.11 0.33 0.34 3
47 V
DSI H05 0
0.32 0.34 7
15 DSI H03 0.03 0.32 0.54 7
61 DSI H08 0.09 0.32 0.28 31 18 DSI H02 0.06 0.32 0.42 4
26 DSI H02 0.06 0.31 0.29 7
49 DSI H03
-0.03 0.31 0.51 19 36 DSI H02
-0.24 0.31 0.32 3
52 Y
DSI H03 0
0.27 0.46 3
94 DSI H04
-0.06 0.27 0.38 5
76 DSI H02
-0.03 0.27 0.48 23 99 DSI H03 0.06 0.25 0.2 41 94 DSI H03 0
0.25 0.22 6
9 DSI H02 0.06 0.24 0.25 6
69 DSI H03 0
0.24 0.42 7
107 DSI H05
-0.14 0.24 0.95 4
29 DSI H07
-0.08 0.23 0.27 1
39 DSI H03
-0.03 0.22 0.8 10 44 DSI H07 0.03 0.22 0.3 17 94 DSI H04 0.09 0.22 0.23 18 68 DSI H02 0.12 0.21 0.22 16 39 DSI H02 0
0.18 0.2 6
103 DSI H03 0.03 0.17 0.22 (1) All indications greater than or equal to 1 volt at EOC-5 were subject to a Plus Point inspection. All indication confirmed by Plus Point inspection were repaired by plugging.
SG-SGDA-03-44, Rev.O Page 52 of 63 Steam Generator 2 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 10 39 Y
DSI H02 0.06 4.51 0.46 5
45 v
DSI H03 0
3.27 0.97 11 41 v
DSI H03 0.12 2.45 0.26 10 50 Y
DSI H02 0
2.1 0.72 5
42 V
DSI H03 0.09 2.02 0.79 7
44 v
DSI H03 0.14 1.8 0.79 46 88 DSI H02 0.09 1.62 1.62 11 42 V
DSI H02
-0.06 1.51 0.47 9
42 V
DSI H03 0.12 1.48 0.32 4
37 v
DSI H03
-0.03 1.38 0.67 4
114 DSI H02 0
1.24 1.08 8
40 V
DSI H03 0.14 1.24 0.5 43 35 DSI H03 0.09 1.18 0.51 12 37 DSI H04 0.09 1.16 1.13 10 84 DSI H03 0.09 1.15 0.48 9
7 DSI H05
-0.38 1.13 0.08 4
38 v
DSI H03 0
1.1 0.13 6
113 DSI H02 0.06 1.1 0.64 15 56 DSI H03 0
1.1 0.53 1
42 DSI H08 0.03 1.09 1.71 13 82 DSI H03 0.09 1.05 1.17 5
105 DSI H03
-0.09 0.99 0.69 6
38 DSI H03 0.12 0.98 0.54 12 52 DSI H02 0.03 0.97 0.49 16 75 DSI H02 0.03 0.96 0.95 3
68 DSI H04
-0.09 0.95 0.78 1 1 36 DSI H02
-0.15 0.89 0.75 2
49 DSI H03 0.09 0.88 0.4 10 43 DSI H02 0.12 0.88 0.64 7
12 DSI H03 0.06 0.87 0.34 9
84 DSI H03 0.12 0.87 0.63 1
59 DSI H03 0
0.86 0.46 11 56 DSI H02
-0.09 0.85 0.86 13 67 DSI H03 0.15 0.85 0.37 6
35 DSI H04 0
0.84 0.87 5
24 DSI H04
-0.06 0.82 0.5
SG-SGDA-03-44, Rev.0 Page 53 of 63 Steam Generator 2 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 15 76 DSI H03 0.09 0.82 0.47 2
83 DSI H02 0.06 0.78 0.78 10 112 DSI H05 0.06 0.78 0.21 28 104 DSI H02
-0.19 0.77 0.53 5
661 DSI H04 0.09 0.76 0.46 10 36 DSI H03
-0.03 0.76 0.47 9
5 DSI H02 0.09 0.75 0.29 6
51 DSI H03 0.14 0.74 0.7 18 110 DSI H03 0
0.74 0.72 5
52 DSI H03
-0.06 0.73 0.62 10 36 DSI H02
-0.12 0.73 0.39 13 49 DSI H02 0.15 0.73 0.51 3
49 DSI H03 0.09 0.72 0.5 13 44 DSI H02 0.12 0.72 0.33 45 82 DSI H02 0.03 0.72 0.41 2
96 DSI H02
-0.03 0.71 0.48 5
24 DSI H03 0
0.71 0.47 5
36 DSI H03 0.06 0.71 0.32 9
99 DSI H03 0
0.71 0.35 5
84 DSI H03
-0.03 0.69 0.33 9
41 DSI H03 0.09 0.67 0.54 10 i11 DSI H03 0.06 0.67 0.36 4
104 DSI H03 0.06 0.66 0.46 5
101 DSI H03
-0.03 0.66 0.22 12 31 DSI H04 0.09 0.66 0.71 2
47 v
DSI H03 0.12 0.65 0.24 48 41 DSI H03 0.09 0.65 0.96 8
38 DSI H04 0
0.64 0.44 9
68 DSI H05 0.06 0.63 0.29 3
15 DSI H02
-0.06 0.62 0.46 13 104 DSI H03 0.06 0.62 0.64 7
45 DSI H03 0.2 0.61 0.45 9
38 DSI H02 0
0.6 0.75 18 41 DSI H03 0.09 0.6 0.59 9
41 DSI H04 0.15 0.59 0.38 11 44 DSI H02 0.06 0.59 0.98 19 30 DSI H03
-0.15 0.59 0.35 4
20 DSI H03
-0.09 0.58 0.19 10 49 DSI H02 0.06 0.58 0.31 5
37 DSI H03
-0.06 0.57 0.34
SG-SGDA-0344, Rev.0 Page 54 of 63 Steam Generator 2 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 7
4 DSI H02 0.12 0.56 0.62 10 12 DSI H02
-0.15 0.56 0.27 14 14 DSI H05
-0.36 0.56 0.35 41 49 DSI H03 0.06 0.56 0.2 43 81 DSI H03 0.06 0.56 0.92 18 38 DSI H05 0
0.55 0.51 13 69 DSI H05 0.06 0.54 0.47 8
56 DSI H04 0.09 0.53 0.39 44 34 DSI H02
-0.21 0.52 0.4 12 66 DSI H03 0.18 0.51 0.4 17 105 DSI H03
-0.12 0.51 0.57 10 53 DSI H02 0.09 0.48 0.29 15 76 DSI H04 0.12 0.48 0.57 16 37 DSI H06 0.12 0.48 0.9 49 34 DSI H02
-0.19 0.48 0.66 12 70 DSI H04 0.15 0.47 0.37 5
60 DSI C1o 0
0.46 0.46 32 84 DSI H03 0
0.46 0.32 5
41 DSI H03 0
0.45 0.19 2
108 DSI H03
-0.03 0.44 0.44 4
36 DSI H07
-0.03 0.44 0.43 4
50 DSI H03 0.06 0.42 0.32 6
103 DSI H03 0.03 0.42 0.37 3
51 DSI H03 0
0.41 0.33 7
12 DSI H04
-0.03 0.41 0.41 1
43 DSI H03 0.09 0.38 0.35 8
42 DSI H03 0.12 0.38 0.24 32 88 DSI H03
-0.09 0.38 0.19 6
45 DSI H02 0.06 0.37 0.24 34 30 DSI H03 0
0.37 0.06 24 36 DSI H02
-0.15 0.36 0.32 2
53 DSI H03 0.03 0.35 0.25 6
11 DSI H02
-0.11 0.35 0.22 18 55 DSI H05 0.09 0.33 0.63 35 36 DSI H02
-0.37 0.33 0.42 1
45 DSI H03 0.03 0.32 0.17 1
75 DSI H03 0.03 0.32 0.84 2
46 DSI H03 0.12 0.32 0.44 8
78 DSI C10
-0.06 0.32 0.37 18 43 DSI H02 0.12 0.32 0.24
SG-SGDA-03-44, Rev.0 Page 5,5 of 63 Steam Generator 2 ROW COL Repaired (1)
~~~VOLTS VOLTS 23 101 DSI H02 0
0.32 0.59 44 89 DSI H07 0.03 0.32 0.2 10 74 DSI H08 0.1 0.31 0.18 11 65 DSI H02 0.06 0.31 0.3 29 1 1 DSI H02
-0.21 0.31 0.28 37 49 DSI H03 0.09 0.3 0.3 10 77 DSI H05
-0.12 0.29 0.23 18 34 DSI H02 0.06 0.27 0.2 23 54 DSI H08
-0.12 0.24 0.33 6
114 DSI H02
-0.09 0.22 0.2 28 81 DSI H02
-0.06 0.22 0.48 43 91 DSI H06 0.03 0.18 0.14 45 81 DSI H02 0.09 0.18 0.51 (1) All indications greater than or equal to I volt at EOC-5 were subject to a Plus Point inspection. All indication confirmed by Plus Point inspection were repaired by plugging.
SG-SGDA-03-44, Rev.0 Page 56 of 63 Steam Generator 3 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 5
69 DSI H03 0.09 3.53 0.84 5
51 y
DSI H03 0.17 2.6 1.09 28 87 DSI H02 0.29 1.8 0.86 29 87 DSI H02 0.03 1.79 0.37 11 85 DSI H02
-0.03 1.78 1.36 11 113 DSI H02 0.03 1.76 1.47 22 92 DSI H03
-0.03 1.45 1.06 10 113 DSI H02 0.03 1.39 1.09 11 97 DSI H02 0.14 1.35 0.87 7
90 DSI H05 0
1.28 1.11 17 95 DSI H02 0.32 1.28 0.34 48 67 DSI H03 0.03 1.26 0.93 10 52 DSI H04 0.15 1.19 1.54 6
79 DSI H05 0
1.17 0.79 11 90 DSI H04
-0.11 1.13 0.97 7
109 DSI H04 0.06 1.12 0.83 10 52 DSI H05 0.15 1.11 1.19 9
62 DSI H04 0.14 1.08 0.75 6
69 DSI H03 0.06 1.07 0.59 7
18 DSI H03
-0.06 1.04 0.89 7
101 DSI H05 0
1.02 0.82 10 36 DSI H04 0.15 1
1.03 12 51 DSI H04
-0.14 1
0.74 17 88 DSI H03 0
1 0.93 7
93 DSI H04
-0.09 0.98 1.32 10 97 DSI H03 0.03 0.96 0.96 21 22 Y
DSI H03 0.09 0.95 1.12 6
48 DSI H05 0.11 0.9 0.92 6
66 DSI H04 0.06 0.9 0.7 4
23 DSI H02
-0.03 0.85 0.72 4
87 DSI H02 0
0.85 0.8 7
42 DSI H03 0.14 0.83 0.38 8
64 DS I H04 0.03 0.82 0.77 4
50 DS I H03 0
0.81 0.73 6
75 Y
DS0I H02 0.03 0.8 0.76 2
68 DSI H03 0.06 0.76 0.66 4
113 DSI H02 0
0.75 0.97 6
38 DS I H02 0.03 0.75 0.4 6
42 DSI H03
-0.03 0.75 0.68
SG-SGDA-03-44, Rev.0 Page 57 of 63 Steam Generator 3 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 8
64 DSI H05 0.11 0.75 0.58 21 98 DSI H02 0.09 0.75 1.1 25 98 DSI H03
-0.03 0.75 0.58 6
45 DSI H02 0.09 0.74 0.61 6
48 DSI H02 0.17 0.73 0.87 47 63 DSI H02
-0.03 0.73 0.62 5
18 DSI H03
-0.03 0.72 0.53 4
35 DSI H02 0.23 0.71 0.69 3
65 DSI H03 0.09 0.69 0.21 5
56 DSI H02
-0.03 0.69 0.87 6
30 DSI H03
-0.03 0.69 0.5 10 40 DSI H03
-0.03 0.68 0.93 29 103 DSI H06 0
0.67 0.43 12 36 DSI H05 0.06 0.66 0.38 4
86 DSI H02 0.09 0.65 0.6 5
25 DSI H04
-0.03 0.64 0.57 8
3 DSI H02 0.11 0.64 0.56 10 15 DSI H05 0.19 0.63 0.55 8
76 DSI H04
-0.06 0.62 0.41 19 90 DSI H05 0.09 0.62 1.04 6
43 DSI H02 0.11 0.61 0.91 6
62 DSI H05 0.06 0.61 0.52 6
68 DSI H03 0
0.61 0.49 12 88 DSI H03 0
0.61 0.65 6
97 DSI C14 0.03 0.6 0.39 7
102 DSI H04
-0.09 0.6 0.56 7
104 DSI H05 0
0.59 0.6 9
22 DSI H02 0.09 0.59 0.43 6
61 DSI H05 0
0.58 0.48 6
84 DSI H04 0.03 0.58 0.59 11 62 DSI H02 0.09 0.57 0.4 19 90 DSI H03 0.03 0.57 0.56 10 88 DSI H05 0.12 0.56 0.46 22 90 DSI H03 0.03 0.56 0.88 32 56 DSI H03
-0.03 0.56 0.34 35 51 DSI H05
-0.25 0.56 0.46 44 70 DSI H06
-0.24 0.56 0.77 5
95 DSI H02
-0.06 0.55 0.46 3
66 DSI H03 0.06 0.54 0.44
SG-SGDA-03-44, Rev.0 Page 58 of 63 Steam Generator 3 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 6
63 DSI H03 0
0.54 0.61 9
53 DSI H04 0.11 0.54 0.55 6
79 DSI H02
-0.03 0.53 0.55 6
62 DSI H03 0.03 0.51 0.65 6
63 DSI H02
-0.03 0.51 0.19 7
63 DSI H03 0.09 0.51 0.47 12 65 DSI H08
-0.19 0.51 0.45 10 82 DSI H04 0.03 0.5 0.48 6
77 DSI H02
-0.17 0.49 0.77 28 94 DSI H02
-0.03 0.49 0.18 3
61 DSI H02 0.06 0.48 0.28 18 88 DSI H06 0.03 0.47 1.59 4
23 DSI H03
-0.03 0.46 0.4 14 100 DSI H02 0.03 0.46 0.13 3
65 DSI H02 0
0.45 0.33 3
60 DSI H03 0
0.44 0.41 3
69 DSI H02 0
0.44 0.16 7
106 DSI H04 0
0.44 0.5 17 94 DSI H05 0.06 0.42 0.32 7
102 DSI H05 0.11 0.41 0.36 5
47 DSI H03 0.06 0.4 0.4 6
59 DSI H04 0.03 0.4 0.35 22 84 DSI H08 0.12 0.4 0.29 6
41 DSI H03
-0.03 0.39 0.94 4
26 DSI H02 0.03 0.38 0.68 14 48 DSI H06 0.09 0.38 0.6 17 86 DSI H02 0.06 0.38 0.28 40 91 DSI H05 0.32 0.38 0.5 18 87 DSI H02 0.09 0.37 0.4 13 72 DSI H02 0.06 0.36 0.23 4
21 DSI H07
-0.06 0.35 0.24 16 97 DSI H03 0
0.35 0.18 7
44 DSI H02 0.11 0.34 0.3 15 72 DSI H03 0
0.34 0.35 6
61 DSI H04
-0.06 0.33 1.04 12 37 DSI H02 0.06 0.33 0.63 28 95 DSI H04
-0.09 0.33 0.33 8
10 DSI H05
-0.03 0.32 0.47 17 92 DSI H05 0.03 0.32 0.74
SG-SGDA-03-44, Rev.0 Page 59 of 63 Steam Generator 3 ROW COL Repaired (1)
IND ELEV INCH EOC 5 EOC 4 VOLTS VOLTS 26 99 DSI H04 0.09 0.32 0.86 27 101 DSI H05 0.17 0.32 0.49 28 86 Q DSI H02
-0.06 0.32 0.17 28 94 DSI H03 0.09 0.32 0.23 11 90 DSI H05
-0.14 0.31 1.22 22 76 DSI H02 0.14 0.31 0.19 14 111 DSI H02 0
0.29 0.46 15 75 DSI H03 0
0.29 0.38 22 65 DSI H02 0.03 0.29 0.21 5
106 DSI H08 0.06 0.26 0.27 10 76 DSI H03 0.03 0.25 0.21 6
31 DSI H08
-0.09 0.23 0.22 18 91 DSI H04 0.03 0.23 0.24 28 95 DSI H02 0.15 0.21 0.33 28 95 DSI H03 0.17 0.2 0.68 31 99
)DSI H02
-0.03 0.19 0.89 13 75
)DSI H02 0.09 0.18 0.19 20 86
)DSI H06 0.06 0.17 0.49 28 95
)DSI H06 0
0.17 0.14 (1) All indications greater than or equal to 1 volt at EOC-5 were subject to a Plus Point inspection. All indication confirmed by Plus Point inspection were repaired by plugging.
SG-SGDA-03-44, Rev.0 Page 60 of 63 Steam Generator 4 Repaired (1)
IND ELEV ROW COL INCH EOC 5 EOC4 VOLTS VOLTS 9
8 6
48 4
8 6
8 6
46 5
8 8
5 1
7 3
5 2
14 8
6 3
1 5
9 9
12 15 17 4
7 6
3 3
8 9
5 5
7 35 65 34 107 61 33 98 27 37 109 27 11 27 62 81 55 97 25 40 39 26 34 110 9
87 75 65 28 24 55 68 39 96 109 40 41 104 49 41 113 45 17 y
y y
y y
DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI H02 H02 H03 H03 H03 H03 H03 H03 H05 H02 H03 H03 H03 H03 H02 H02 H03 H03 H04 H03 H03 H03 H05 H03 H04 H05 H03 H03 H02 H02 H03 H02 H04 H05 H03 H02 H03 H03 H04 H04 H04 0
-0.03
-0.09 0.32 0.09
-0.06 0
0.09 0
-0.06 0.23 0.14
-0.03 0.06 0.06 0.06 0.06 0
0.08 0.09 0.17
-0.09 0.06 0.06 0.14 0.09 0.15 0.03 0.06 0
0.06 0.03 0.06 0.03 0.03
-0.08 0.12 0.03
-0.09 0.06 0.09 1.98 1.97 1.71 1.52 1.41 1.4 1.37 1.37 1.36 1.33 1.29 1.18 1.03 0.98 0.96 0.95 0.92 0.92 0.89 0.89 0.87 0.85 0.82 0.76 0.76 0.75 0.74 0.74 0.74 0.72 0.71 0.71 0.7 0.69 0.69 0.67 0.67 0.66 0.66 0.66 0.66 1.94 2.04 0.86 0.28 1.3 1.2 0.98 1.31 1.39 0.89 1.59 1.82 1.06 0.89 0.56 0.74 1.13 0.61 0.94 0.58 0.96 0.42 0.8 0.56 0.73 0.58 0.39 0.59 0.74 0.56 0.59 0.71 0.87 0.86 0.5 0.3 0.47 0.72 0.36 0.6 0.65
SG-SGDA-03-44, Rev.0 Page 61 of 63 Steam Generator 4 Repaired (1)
IND ELEV ROW COL 7
9 14 43 1
3 5
20 5
7 5
5 7
14 7
14 16 17 12 16 6
9 11 17 32 2
6 8
5 5
39 4
6 14 22 8
30 6
6 7
4 4
62 49 31 28 29 53 2
109 32 69 38 62 65 33 99 49 103 79 53 82 100 41 41 13 103 66 50 111 97 98 23 60 40 29 58 103 105 49 101 75 85 99 y
DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI H05 H02 H05 H02 H03 H05 H05 H04 H03 H02 H03 H02 H05 H04 H02 H02 H03 H04 H02 H02 H03 H03 H03 H04 H02 C12 H04 H04 H03 H02 H02 H06 H03 H05 H02 H02 H03 H05 H03 H03 H02 H03 INCH EOC 5 EOC 4 VOLTS VOLTS
-0.03 0.65 0.81 0.06 0.65 0.56 0.03 0.65 0.32 0.03 0.64 0.51 0.06 0.63 0.5
-0.08 0.62 0.6
-0.23 0.62 0.67 0.09 0.61 0.26 0.03 0.6 0.65
-0.06 0.6 0.92 0.06 0.59 0.51 0
0.59 0.52 0
0.59 0.64 0.09 0.59 0.37
-0.03 0.58 0.21 0.09 0.58 0.43
-0.18 0.57 0.35 0.12 0.57 0.29 0.06 0.56 0.49 0.03 0.56 0.43 0
0.55 0.62 0.26 0.55 0.47 0.06 0.55 0.27
-0.18 0.55 0.31
-0.21 0.55 0.56 0
0.54 0.46 0.03 0.54 0.74
-0.12 0.54 0.49
-0.03 0.53 0.26
-0.06 0.53 0.49 0.06 0.53 0.37 0.03 0.52 0.38
-0.03 0.52 0.79 0.03 0.52 0.42 0.33 0.52 0.28
-0.06 0.51 0.46 0
0.5 0.82
-0.06 0.49 0.62 0.11 0.49 0.58
-0.06 0.49 0.42 0
0.48 1.06 0.06 0.48 0.44
SG-SGDA-03-44, Rev.0 Page 62 of 63 Steam Generator 4 Repaired (1)
IND ELEV ROW COL 5
12 3
6 9
4 4
12 14 8
5 14 9
17 7
14 24 47 9
13 4
7 13 5
6 48 2
13 2
3 7
29 5
2 9
12 20 6
8 10 7
14 66 12 34 113 44 13 107 49 31 103 42 32 41 55 59 47 66 87 49 84 52 5
51 31 28 51 90 64 39 39 43 62 73 43 60 5
64 110 49 78 69 48 DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI H04 H03 H03 H03 H04 H03 H03 H02 H02 H04 H03 H03 H04 H05 C10 H02 C11 H02 H04 H02 H04 H04 H04 H03 H03 H03 C12 C05 H03 H05 H04 H04 H04 H03 H05 H04 H03 H05 H02 H03 H07 H02 INCH EOC 5 EOC4 VOLTS VOLTS
-0.03 0.48 0.5 0.06 0.48 0.48 0
0.47 0.46 0
0.47 0.31
-0.06 0.47 0.27
-0.03 0.46 0.52
-0.09 0.46 0.35
-0.09 0.46 0.23
-0.12 0.46 0.3 0.06 0.45 0.41 0.06 0.44 0.53 0
0.44 0.47 0.08 0.43 0.68 0
0.43 0.26 0.03 0.42 0.62 0.09 0.42 0.52 0.03 0.41 0.42 0.03 0.41 0.32 0.03 0.4 0.18 0
0.39 0.37 0.08 0.38 0.2 0.03 0.37 0.32 0
0.37 0.17 0.11 0.36 1.12 0.14 0.36 0.31
-0.03 0.36 0.38
-0.09 0.35 0.41 0.03 0.35 0.25
-0.06 0.34 0.28 0
0.34 0.35
-0.06 0.34 0.39
-0.23 0.34 0.28 0
0.33 0.47
-0.03 0.31 0.4 0.06 0.31 0.29 0.19 0.29 0.51 0.03 0.29 0.28
-0.03 0.28 0.21
-0.03 0.28 0.34 0.09 0.28 0.52
-0.14 0.26 0.31 0.09 0.26 0.27 y
SG-SGDA-03-44, Rev.O Page 63 of 63 Steam Generator 4 Repaired (1)
IND ELEV ROW COL 17 4
2 14 16 3
13 2
10 18 7
109 43 30 111 35 63 77 39 47 70 69 DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI DSI H07 H02 H03 H02 H02 H02 H05 H07 H03 H04 H04 INCH EOC 5 VOLTS 0.06 0.25
-0.03 0.24 0.06 0.23
-0.12 0.22 0.03 0.19
-0.03 0.17 0
0.17 0.06 0.16 0.12 0.16 0.15 0.14
-0.09 0.13 EOC4 VOLTS 0.22 0.51 0.22 0.33 0.2 0.26 0.21 0.37 0.43 0.11 0.19 y
(1) All indications greater than or equal to 1 volt at EOC-5 were subject to a Plus Point inspection. All indication confirmed by Plus Point inspection were repaired by plugging.
ENCLOSURE 2 WATTS BAR NUCLEAR PLANT UNIT 1 PRELIMINARY RESULTS OF METALLURGICAL EXAMINATION
ENCLOSURE 2 WATTS BAR NUCLEAR PLANT (WBN) UNIT 1 STEAM GENERATOR PRELIMINARY RESULTS OF METALLURGICAL EXAMINATION During the WBN Unit 1 Cycle 5 refuel outage, a portion of two tubes were removed from the hot leg side of steam generator 2.
The tubes with portions removed were Row 10 Column 39 and Row 11 Column 41.
Both tubes had portions from the hot tube end through hot leg tube support plate 3 removed.
BURST TESTING RESULTS The Table below summaries the results from the burst tests.
Location Burst Amplitude Estimated Preliminary Pressure (volts)
Max.
Depth /
Characterization (psi)
Length RlOC39 H01 N/A NDD (BC)
N/A N/A RlOC39 H02 4,931 4.51v DSI 76% /
axial (BC) 0.71" (+Pt) intergranular ODSCC RlOC39 H03 12,058 NDD (BC)
N/A axial intergranular ODSCC R1lC41 H01 N/A NDD (BC)
N/A N/A RlC41 H02 12,649 NDD (BC)
N/A axial intergranular ODSCC RllC41 H03 9,998 2.45v DSI 76% / 0.65" axial (BC)
(+Pt) intergranular ODSCC Definitions
+PT -
Plus Point probe BC -
Bobbin Coil probe DSI -
Distorted Support Indication HTS -
Hot leg upper tube sheet H01 -
Hot leg first tube support plate intersection (at WBN this is a flow distribution baffle)
H02 -
Hot leg second tube support plate intersection H03 -
Hot leg third tube support plate intersection SCI -
Single Circumferential Indication LEAK TESTING RESULTS Leakage was observed from the RlOC39H02 location and RllC41H03 location.
Leak test results for these locations are plotted in the following figures and tables.
E2-1
ENCLOSURE 2 WATTS BAR NUCLEAR PLANT (WBN) UNIT 1 STEAM GENERATOR PRELIMINARY RESULTS OF METALLURGICAL EXAMINATION Elevated Temperature Leak Rate Test Data Rl0C39 Piece 3B [1e TSP (H02)]
Delta P Primary Secondary Primary Leak Rate Pressure Pressure Temperature (gal/min)
Min 1182 2204 1022 618 Test 1 Max 1327 2351 1024 620 0.0004 Average 1260 2283 1023 619 Min 1165 2185 1020 618 Test 2 Max 1191 2211 1022 619 0.0004 Average 1181 2202 1021 618 Min 1270 2185 914 617 Test 3 Max 1364 2280 916 619 0.0005 Average 1306 2221 915 618 Min 1418 2237 818 611 Test 4 Max 1431 2250 819 613 0.0008 Average 1425 2244 819 612 Min 1515 2234 717 604 Test 5 Max 1605 2324 720 607 0.0013 Average 1563 2282 719 606 Min 1557 2276 718 600 Test 6 Max 1594 2312 720 603 0.0013 Average 1579 2297 719 601 Min 1604 2223 619 594 Test 7 Max 1717 2338 621 597 0.0013 Average 1654 2274 620 596 Min 1713 2234 519 584 Test 8 Max 1792 2311 521 587 0.0019 Average 1753 2273 520 586 Min 1810 2237 426 575 Test 9 Max 1837 2264 427 578 0.0019 Average 1828 2255 427 576 Min 1892 2319 427 560 Test 10 Max 1922 2351 429 562 0.0032 Average 1904 2332 428 561 Min 2070 2499 428 560 Test 11 Max 2091 2520 429 561 0.0057 Average 2085 2514 429 560 Min 2374 2781 396 578 Test 12 Max 2419 2816 407 582 0.0220 Average 2402 2803 401 580 Min 2379 2770 390 581 Test 13 Max 2404 2797 394 584 0.0216 Average 2390 2781 392 583 E2-2
ENCLOSURE 2 WATTS BAR NUCLEAR PLANT (WBN) UNIT 1 STEAM GENERATOR PRELIMINARY RESULTS OF METALLURGICAL EXAMINATION Elevated Temperature Leak Rate Test Data R11C41 Piece 4B [2nd TSP (H03)]
Delta P Primary Secondary Primary Leak Rate Delta__
P Pressure Pressure Temperature (gallmin)
Min 1332 2400 1065 631 Test 1 Max 1391 2458 1069 632 0.0001 Average 1375 2443 1067 632 Min 1284 2345 1060 631 Test 2 Max 1323 2386 1064 632 0.0001 Average 1300 2362 1062 632 Min 1462 2377 915 630 Test 3 Max 1529 2448 919 631 0.0002 Average 1500 2417 917 630 Min 1525 2343 818 629 Test 4 Max 1628 2447 820 630 0.0002 Average 1596 2415 819 630 Min 1536 2353 815 628 Test 5 Max 1612 2430 818 630 0.0002 Average 1573 2390 817 629 Min 1726 2401 674 624 Test 6 Max 1767 2442 677 626 0.0002 I Average 1754 2429 675 625 Min 1783 2304 520 614 Test 7 Max 1872 2392 521 615 0.0005 Average 1817 2337 521 615 Min 1960 2480 519 611 Test 8 Max 2056 2576 520 614 Average 2000 2519 519 613 0.0005 Min 1961 2479 518 611 Test 9 Max 2033 2553 520 613 0.0004 Average 1999 2518 519 612 Min 2063 2487 420 599 Test 10 Max 2115 2537 424 609 0.0016 Average 2095 2517 422 602 Min 2025 2452 425 598 Test 11 Max 2042 2469 428 600 0.0014 Average 2032 2458 426 599 Min 2264 2694 430 596 Test 12 Max 2292 2722 431 598 0.0013 Average 2278 2709 430 597 Min 2401 2716 314 584 Test 13 Max 2428 2744 316 589 0.0020 Average 2411 2726 315 586 1
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ENCLOSURE 2 WATTS BAR NUCLEAR PLANT (WBN) UNIT 1 STEAM GENERATOR PRELIMINARY RESULTS OF METALLURGICAL EXAMINATION Elevated Temperature Leak Rate Curve RlOC39 HL. Piece 3B (1st TSP
[H02])
0.0300 0.0250 0.0200 E
-a o 0.0150 Cc X0 a)
-J 0.0100 0.0050 0.0000 1000 1200 1400 1600 1800 2000 2200 2400 2600 Average Delta P (psi)
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ENCLOSURE 2 WATTS BAR NUCLEAR PLANT (WBN) UNIT 1 STEAM GENERATOR PRELIMINARY RESULTS OF METALLURGICAL EXAMINATION Elevated Temperature Leak Rate Curve for Rl1C41 HL Piece 4B (2 nd TSP
[HO3])
0.0025 0.0020 E 0.0015 (U
0, co 0 0.0010
-0 0.0005 0.0000 4-1000 1200 1400 1600 1800 2000 2200 2400 Average Delta P (psi) 2600 E2-5
ENCLOSURE 3 WATTS BAR NUCLEAR PLANT UNIT 1 STEAM GENERATOR VOLTAGE BASED ALTERNATE REPAIR CRITERIA FOR AXIAL OUTSIDE DIAMETER STRESS CORROSION CRACKING (ODSCC)
CYCLE 5 NINETY DAY REPORT COMMITMENT LIST
ENCLOSURE 3 WATTS BAR NUCLEAR PLANT UNIT 1 STEAM GENERATOR VOLTAGE BASED ALTERNATE REPAIR CRITERIA FOR AXIAL OUTSIDE DIAMETER STRESS CORROSION CRACKING (ODSCC) -
CYCLE 5 NINETY DAY REPORT COMMITMENT LIST
- 1.
TVA will provide the results of the metallurgical examination from the two removed steam generator tubes as soon as it becomes available.
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