ML13018A107

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Drift Study for General Electric Model NGV13B Undervoltage Relays
ML13018A107
Person / Time
Site: River Bend Entergy icon.png
Issue date: 01/20/2009
From: Melson K
Entergy Operations
To: Wang A
Plant Licensing Branch IV
Wang A
Shared Package
ML13018A081 List:
References
TAC ME7767 G13.18.6.3-012
Download: ML13018A107 (43)
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Text

ANO-1 ANO-2 GGNS IP-2 IP-3 PLP JAF PNPS RBS VY W3 (1) (2)

CALCULATION EC # 11753 Page 1 of 43 COVER PAGE (3) Design Basis Calc. YES NO (4) CALCULATION EC Markup (5 ) (6)

Calculation No: G13.18.6.3-012 Revision: 0 (7)

Title:

Drift Study for General Electric Model NGV13B Undervoltage Relays (8) (9)

System(s): 302 Review Org (Department): NSBE3 (I&C Design)

(10) (11)

Safety Class: Component/Equipment/Structure Type/Number:

Safety / Quality Related E22-S004-27N1 E22-S004-27N2 Augmented Quality Program Non-Safety Related E22-S004-27S1 E22-S004-27S2 E22-S004-27S3 E22-S004-27S4 (12)

Document Type: F43.02 (13)

Keywords (Description / Topical Codes): Drift

    

REVIEWS (14) (15) (16)

Name/Signature/Date Name/Signature/Date Name/Signature/Date K.R. Melson / R.J. Hannigan /

See AS for electronic signature

/ 1-20-09 / 1-20-09 Responsible Engineer Design Verifier Supervisor/Approval Reviewer Comments Attached Comments Attached

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 2 OF 13 CALCULATION CALCULATION NO: G13.18.6.3-012 REFERENCE SHEET REVISION: 0 I. EC Markups Incorporated None II. Relationships: Sht Rev Input Output Impact Tracking Doc Doc Y/N No.

1. 350913 NA  ! " N
2. 371449 NA  ! " N
3. CR-RBS-2008-01550 NA  ! " N
4. CR-RBS-2008-01783 NA  ! " N
5. ECH-NE-08-00015 000  ! " N
6. G13.18.6.2-ENS-004 0 000 "  ! Y 11753
7. STP-302-1604 1 7  ! " N
8. STP-302-1604 1 9  ! " N
9. STP-302-1604 1 10  ! " N
10. STP-302-1604 1 11  ! " N
11. STP-302-1604 1 12  ! " N
12. STP-302-1604 2 7  ! " N
13. STP-302-1604 3 7  ! " N
14. WO-50688141 0  ! " N
15. WO-51006660 0  ! " N
16. WO-51037964 0  ! " N III. CROSS

REFERENCES:

1. American National Standard N15.15-1974, Assessment of the Assumption of Normality (Employing Individual Observed Values)
2. ANSI/ISA-S67.04-Part I-2000, Setpoints for Nuclear Safety Related Instrumentation
3. DOE Research and Development Report No. WAPD-TM-1292, Statistics for Nuclear Engineers and Scientists Part 1: Basic Statistical Inference, February 1981
4. EPRI TR-103335R1, Statistical Analysis of Instrument Calibration Data; Guidelines for Instrument Calibration Extension / Reduction Programs, October 1998
5. ISA-RP67.04-Part II-2000, Methodologies for the Determination of Setpoints for Nuclear Safety-Related Instrumentation, Second Printing, June 12, 1995
6. NRC Generic Letter 91-04, Changes in Technical Specification Surveillance Requirements to Accommodate a 24 Month Fuel Cycle, April 2, 1991

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 3 OF 13 CALCULATION CALCULATION NO: G13.18.6.3-012 REFERENCE SHEET REVISION: 0 IV. SOFTWARE USED:

Title:

N/A Version/Release: Disk/CD No.

V. DISK/CDS INCLUDED:

Title:

N/A Version/Release Disk/CD No.

VI. OTHER CHANGES:

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 4 OF 13 Revision Record of Revision Initial issue.

0

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 5 OF 13 TABLE OF CONTENTS 1 Purpose!.................................................................................................................................................!6 2 Conclusions!...........................................................................................................................................!7 3 Design!Inputs!.........................................................................................................................................!7 4 References!.............................................................................................................................................!7 5 Assumptions!..........................................................................................................................................!8 6 Method!of!Analysis................................................................................................................................!8 7 Analysis!..................................................................................................................................................!9 8 Attachments!........................................................................................................................................!13

! Attachment 1 - Drift Analysis Supporting Information (Excel Spreadsheet) - 22 pages Attachment 2 - DVR Forms with comments - 8 pages

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 6 OF 13 1 Purpose 1.1 The purpose of this analysis is to establish more realistic drift values and characteristics to be used by instrument uncertainty calculations for determination of setpoints and allowable values for the subject instrumentation. The drift values are determined by historical As Found / As Left data analysis.

1.2 Specifically, this analysis addresses General Electric Model NGV13B Undervoltage Relays with tag numbers as shown in Table 1.2-1 below. Also shown in the table are the calibration procedure numbers, device functions, and applicable Technical Specification (TS) sections. The results of this analysis can be conservatively applied to any General Electric Model NGV13B Undervoltage Relay used at River Bend Station that meets the criteria listed in Section 3.5.3 of Reference 4.1.3, Considerations When Combining Instruments Into a Single Group.

TABLE 1.2-1 COMPONENT LIST PROCEDURE NO. TAG NO. FUNCTION TS SECTION E22-S004-27N1 Loss of Power (LOP) Instrumentation E22-S004-27N2 E22-S004-27S1 Division 3 - 4.16 kV Emergency Bus STP-302-1604 3.3.8.1.3-2.a E22-S004-27S2 Undervoltage E22-S004-27S3 E22-S004-27S4 Loss of Voltage - 4.16 kV Basis

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 7 OF 13 2 Conclusions 2.1 The bounding Analyzed Drift (DA) for the General Electric Model NGV13B Undervoltage Relays (See Table 1.2-1) has been determined to be ! 5.823 VAC for 30 months (24 months + 25%), with no significant bias. The Analyzed Drift should be treated as a normally distributed, 2" value for uncertainty analysis.

2.2 The results of this analysis can be conservatively applied to all of the undervoltage relays in Table 1.2-1 and to any General Electric Model NGV13B Undervoltage Relay used at River Bend Station, which meets the criteria listed in Section 3.5.3 of Reference 4.1.3, Considerations When Combining Instruments Into a Single Group, of Reference 4.1.3.

3 Design Inputs 3.1 Pages1 through 4 of Attachment 1 provide a listing of the historical As Left (AL) and As Found (AF) data, as obtained from Reference 4.2.1, with any data exclusions or modifications noted. All dates of calibration are also entered to provide time intervals between calibrations. (Note that the data is recorded in units of VAC, as measured for direct calibration of the relay; which is not the actual bus voltage.)

4 References 4.1 METHODOLOGY 4.1.1 ANSI/ISA-S67.04-Part I-2000, Setpoints for Nuclear Safety Related Instrumentation 4.1.2 ISA-RP67.04-Part II-2000, "Methodologies for the Determination of Setpoints for Nuclear Safety-Related Instrumentation," Second Printing, June 12, 1995 4.1.3 ECH-NE-08-00015, Instrument Drift Analysis Design Guide," Rev. 0, Generated by EXCEL Services Corporation, July 2008 4.1.4 EPRI TR-103335R1, "Statistical Analysis of Instrument Calibration Data; Guidelines for Instrument Calibration Extension / Reduction Programs," October, 1998 4.1.5 DOE Research and Development Report No. WAPD-TM-1292, "Statistics for Nuclear Engineers and Scientists Part 1: Basic Statistical Inference," February 1981 4.1.6 NRC Generic Letter 91-04, "Changes in Technical Specification Surveillance Requirements to Accommodate a 24 Month Fuel Cycle," April 2, 1991 4.1.7 American National Standard N15.15-1974, "Assessment of the Assumption of Normality (Employing Individual Observed Values)"

4.2 PROCEDURES 4.2.1 Historical Calibration Records from RBS Surveillance Test Procedure Results for STP-302-1604

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 8 OF 13 4.3 MISCELLANEOUS REFERENCES 4.3.1 None 5 Assumptions 5.1 This drift report employs those assumptions customarily used for standard statistical analyses, as directed by Reference 4.1.3, such as the assumption that a distribution is normal and the use of statistical tests to confirm this hypothesis.

5.2 This drift report is based on analysis of historical As Found and As Left data from calibration records for the devices listed in Table 1.2-1. The results of this analysis can also apply to any General Electric Model NGV13B Undervoltage Relay used at RBS, but care must be taken when applying these results. Specifically, in order to apply the results of this analysis to other similar devices, the devices must meet the criteria listed in Section 3.5.3 of Reference 4.1.3, Considerations When Combining Instruments Into a Single Group.

6 Method of Analysis 6.1 The methodology used for this analysis is Reference 4.1.3, which is written in accordance with Reference 4.1.4, using References 4.1.1, 4.1.2 and 4.1.7 to supplement. An overview of the methodology is given herein, and any deviation from Reference 4.1.3 or any supplemental methods used herein are described.

6.2 This analysis determines the drift values for the subject instrumentation by analysis of historical As Found / As Left data from calibration records. Drift for a given device for a calibration period is determined by subtracting the previous As Left setting from a more recent As Found setting. The time interval for that calibration period is determined by subtracting the previous date from the more recent date, in units of days. All retrievable As Left and As Found data is collected for each calibration performed on each device covered by this report, for the study period. From this information, the drift and calibration interval is generated for each possible instance. Per Section 3.4.2 of Reference 4.1.3, "The goal is to collect enough data for the instrument or group to make a statistically valid pool." The devices covered by this report are currently calibrated on an 18 Month basis, and the proposed extension is for a 24 Month nominal calibration interval. Therefore, a study period of 16 years represents more than ten of the present calibration cycles, and eight of the proposed calibration cycles, which is adequate to understand the component's performance over time. Also, a sufficient number of valid drift values are provided as a result of the selected study period to make a statistically valid pool. Therefore, As Found and As Left Data values are entered from calibrations occurring for approximately the last 16 years.

6.3 Determination of the Analyzed Drift is generally accomplished through the following steps.

6.3.1 Gather and Generate Raw Drift Data: In addition to gathering the As Found and As Left data, and computing the drift values and time intervals, this step also involves an investigation into whether all of the devices should be analyzed together, or whether they should be separated into smaller analysis groups. Finally, this step

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 9 OF 13 involves careful screening of the input data for errors or other situations that could disrupt the proper determination of drift.

6.3.2 Determination of Outliers and Statistical Summary: In order to properly model the drift characteristics for a device, it could be proper to remove up to one more data value, which obviously does not conform to the vast majority of the data. A t-Test is performed on the data to detect any outliers, and remove up to one if appropriate, per the guidelines of Reference 4.1.3. Additionally, the basic statistical values which describe the group of drift data are derived in this step, including such parameters as Mean, Standard Deviation, Count, Median, Minimum, Maximum, etc.

6.3.3 Tests for Normality: Per Reference 4.1.3, a statistical test (W or D-Prime, depending on sample size) is performed on the drift data to support the hypothesis that the data conforms to a normal distribution. If this test is unable to support that hypothesis, then a Coverage Analysis is performed to ensure that the data can be conservatively modeled by a normal distribution and to provide an adjustment to the standard deviation of the drift model, if necessary to conservatively envelop the observed data population.

6.3.4 Time-Dependency

Per Reference 4.1.3, Scatter Plots and a time-based Binning Analysis are developed for the data to establish the time-dependency of the drift. If enough drift data exists for significantly different time intervals, regression analysis is performed to aid in the determination of time-dependency. The drift data is determined to be strongly time dependent or moderately time dependent, for the purpose of extrapolation.

6.3.5 Analyzed Drift Derivation and Characterization: The drift values are determined for the current calibration interval. These values are conservatively extrapolated to the desired calibration interval, based on the methods prescribed in Reference 4.1.3, depending on the degree of time-dependency derived for the drift data.

6.4 The mathematical computations of the statistical analysis are performed within an Excel spreadsheet. Supporting information from the spreadsheet is printed out in the form of Attachment 1 to this analysis. Microsoft Excel spreadsheets generally compute values to an approximate 15 decimal resolution, which is well beyond any required rounding for engineering analyses. However, for printing and display purposes, most values are displayed to lesser resolution. It is possible that hand computations will produce slightly different results, because of using rounded numbers in initial and intermediate steps, but the Excel computed values are considered highly accurate in comparison.

6.5 Acceptance Criteria: Since the purpose of the analysis is to generate a value and description of the characteristics of the drift of the evaluated make/model, there are no specific acceptance criteria.

7 Analysis 7.1 Gather and Generate Raw Error Data 7.1.1 Specifically, this analysis addresses General Electric Model NGV13B Undervoltage Relays, with the tag numbers as shown in Table 1.2-1 of this analysis. These relays have identical manufacturer and model numbers, identical settings, and are used in

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 10 OF 13 identical applications. Therefore, all data is properly pooled for analysis, and no specific pooling tests are required.

7.1.2 Pages 1 through 4 of Attachment 1 provide a listing of the initial As Found and As Left data from available historical plant calibration records for the subject undervoltage relays. Note that the calibration dates are also recorded, and notes are provided to clarify the activities performed or to provide additional information about the data, as appropriate. This data was entered into an Excel spreadsheet for computation of the drift values, time intervals between calibrations and statistical analysis.

7.1.3 A screening of the initial input data from pages 1 through 4 of Attachment 1 was performed. To help identify erroneous data, an informal critical T-test was performed, with the Critical T values reduced incrementally until approximately 10%

of the data population was identified as outliers. Those outliers were researched, and no additional data errors were revealed. As shown in Table 7.4.2-1, the only data excluded from this analysis is due to a failed relay. The specific informal T-tests performed are not documented, as they are only used as tools to identify potentially erroneous data and do not contribute to the analysis of the valid data.

7.1.4 Data not entered into the analysis is listed in the table below, showing the reasoning used in not entering the data.

Table 7.4.2-1 Data Not Entered in the Drift Analysis Procedure Tag Number Surveillance Comments/Disposition Number Date(s)

The relay was replaced because of a broken rheostat adjusting wire. The device had failed.

STP-302-1604 E22-S004-27N2 02/24/08 Therefore, the As Found data from this relay calibration is excluded from the drift analysis.

7.1.5 Per the methodology of Section 4.1.1.11 of Reference 4.1.3, drift is computed by subtracting the As Left data of one calibration from the As Found data of the next calibration, as documented in pages 5 through 8 of Attachment 1. These pages also document the time interval between calibrations (in the number of days and months) by subtracting the As Left date of one calibration from the As Found date of the next calibration, per Section 4.1.1.10 of Reference 4.1.3. Pages 5 through 8 of Attachment 1 import the Sequence ID, the Tag No., the AF / AL flags, the dates of calibration and the As Found and As Left data from pages 1 through 4 of Attachment 1 and compute the interval between calibrations. Pages 5 and 6 of Attachment 1 compute the drift values and summarize the time intervals computed.

As an example of the equations used, the first drift value and time interval are computed as follows. The rest of the values are computed identically.

Drift (Seq 1) = AF (02/24/08) - AL (03/21/06) [For Tag E22-S004-27N1]

= 87.80 (From Seq. 1 on Left) - 87.80 (From Seq. 4 on Left)

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 11 OF 13

= 0.00 VAC Cal Interval (Seq 1) = 02/24/08 - 03/21/06

= 705 Days Cal Interval (Mo.) = Cal Interval (Days) x 12 Months / 365.25 Days

= 23.2 Months 7.2 Determination of Outliers and Statistical Summary 7.2.1 The outlier analysis is recorded on pages 9 and 10 of Attachment 1 to this drift analysis. These pages display the Sequence No., Tag No., Drift, and Calibration Interval (in units of Days). The critical T value used in the outlier analysis comes directly from Table 2 of Reference 4.1.3. As shown on page 9 of Attachment 1, one outlier is detected and removed from the analysis per Section 3.6.3 of Reference 4.1.3. The Final Data Set (FDS) for this analysis is documented on pages 9 and 10 of Attachment 1 and is identical to the original data set, except for the single outlier that was removed.

7.2.2 A summary of the required statistical values for the Final Data Set, per Section 4.2 of Reference 4.1.3, is developed on page 9 of Attachment 1. Cell formulas for the determinations of statistical quantities are used directly from Section 4.2 of Reference 4.1.3.

7.3 Tests for Normality 7.3.1 Since the FDS contains greater than 50 samples, the D-Prime Test is performed on the data to test for normality, as shown on pages 11 and 12 of Attachment 1. Per Section 3.7.3 of Reference 4.1.3, the details of the D-Prime test methodology are shown in Reference 4.1.7. Equations used are listed on page 11 of Attachment 1.

Since the calculated D' (123.7) is within the acceptable range for 58 data points (119.9 to 126.5), this test does not reject the assumption of normality for this data set. Therefore, per Section 3.7 of Reference 4.1.3, the data is determined to be normally distributed, and no coverage analysis is necessary.

7.3.2 Since the D-Prime test did not reject the assumption of normality, a Coverage Analysis is not necessary, but a Histogram is developed for information only. The Histogram is developed and documented on pages 13 and 14 of Attachment 1, per Sections 3.7.5 and 4.4 of Reference 4.1.3. To generate the Histogram data, the drift values are categorized into 12 bins, in relation to the mean and standard deviation. These bins are generated in multiples of 1/2 Standard Deviation increments, and the bin maximum values are derived in accordance with the methods given in Section 19 of Reference 4.1.4. (See page 13 of Attachment 1 for specific formulas used for the maximums.)

The expected populations within each bin are developed from normal distribution percentages, as shown on page 13 of Attachment 1. It is observed that the data passes the normality test and a Histogram is presented on page 14 of Attachment 1 for information only.

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 12 OF 13 7.4 Time-Dependency 7.4.1 In order to determine time-dependency of the drift data, the data is first plotted as a scatter plot on page 15 of Attachment 1, in accordance with the methodology of Section 4.5.1 of Reference 4.1.3. The trend line within this scatter plot starts at a positive value and crosses zero within the analysis period. The data scatter does not appear to increase over time. The trend line and the associated equation are noted on the scatter plot on page 15 of Attachment 1.

7.4.2 The binning analysis is performed on pages 16 and 17 of Attachment 1. The drift and time interval data are divided into bins, based on the intervals between calibrations as defined in Section 3.8.3.1 of Reference 4.1.3. Statistical summaries for each bin, including count, mean, standard deviation, mean time interval and maximum observed time interval are computed. Excel functions are used to determine the statistical summary values for each bin, and are used explicitly from Sections 4.2.1, 4.2.2, 4.2.3 and 4.2.7 of Reference 4.1.3. This information is presented on page 16 of Attachment 1. Per Section 3.8.3.4 of Reference 4.1.3, after removing those bins with 5 or less data points and those with less than or equal to 10% of total population, only Bins 4 and 5 remain.

Page 17 of Attachment 1 displays a plot of the means and standard deviations of the drift data versus the average time interval between calibrations for the subject bins, in accordance with Section 4.5.2 of Reference 4.1.3. It also provides all of the binning parameters and statistics that are a part of the binning analysis. The mean value of the data starts from a positive value in Bin 4 and crosses zero to a relatively small, negative value for Bin 5. Also, from this plot, the standard deviation increases very slightly from Bin 4 to Bin 5, such that the trend line is essentially flat.

In addition, the ratio of the variances (Bin 5 / Bin 4) is compared to the F critical value, as directed by Section 4.5.2 of Reference 4.1.3. Only the standard deviation plot could be indicative of potential time dependency, but strong time dependency is not indicated from the variance test (Sections 3.8.3.4 and 4.5.2 of Reference 4.1.3).

7.4.3 Per Section 3.8.4 of Reference 4.1.3, a drift regression analysis is performed within pages 18 and 19 of Attachment 1. The equations and functions used by Excel are taken specifically from Section 3.8.4 of Reference 4.1.3. The regression analysis output shows an R Squared Value (0.038850) less than 0.09, a P Value greater than 0.05 (0.138070) and F Value (2.263551) less than F Critical (3.161861). All three of these comparisons indicate no significant time dependency of the drift bias.

Also, the regression line crosses zero within the analysis period, which per the last paragraph of Section 3.8.4 of Reference 4.1.3, is not expected and is an improper model of the drift-versus-time characteristic of the device. Finally, the binning plot shows a positive mean value for Bin 4 and a negative value for Bin 5. Therefore, the drift bias shows no significant time dependency. The bias portion of drift is conservatively treated as moderately time-dependent for the purpose of extrapolation.

7.4.4 Per Section 3.8.4 of Reference 4.1.3, an absolute value drift regression analysis is performed within pages 20 and 21 of Attachment 1. The drift data is converted into absolute value via the Excel ABS function for each drift data value. The equations and functions used by Excel for the Regression analysis are taken specifically from Section 3.8.4 of Reference 4.1.3. This regression analysis output shows an R Squared Value (0.002233) less than 0.09, a P Value (0.724681) greater than 0.05,

DRIFT ANALYSIS G13.18.6.3-012 ENGINEERING DEPARTMENT Revision 0 RIVER BEND STATION PAGE 13 OF 13 and an F Value (0.125304) less than F Critical (3.161861). These results all indicate a random portion of drift that is not significantly time-dependent. Because of these results and the relatively flat trend lines for this regression plot and the binning plot for the standard deviation, per Section 3.8.4 of Reference 4.1.3, the random portion of drift is not significantly time dependent. The random portion of drift is conservatively treated as moderately time-dependent for the purpose of extrapolation.

7.5 Analyzed Drift (DA) Derivation and Characterization 7.5.1 As shown on page 22 of Attachment 1, per Section 3.11 of Reference 4.1.3, the drift bias error is evaluated for significance. The critical value for significance of the bias term is computed and shown therein. The bias is determined to be negligible.

Therefore, the computed Analyzed Drift Bias term (DAbias) is negligible.

7.5.2 Per Section 4.6.6 of Reference 4.1.3, the random portion of the Analyzed Drift is determined from multiplying the standard deviation of the Final Data Set by the Tolerance Interval Factor (TIF), and extrapolating as required to a calibration interval of 30 months. Since the random portion of drift has been determined to be moderately time-dependent for the purpose of extrapolation, the standard deviation of the FDS is used with the maximum observed time interval from Bin 5 on page 16 of Attachment 1 as the starting point. The TIF is obtained from Table 1 of Reference 4.1.3 as 2.354 for a 95/95 significance. The computation of this value is shown on page 22 of Attachment 1 to result in a DArandom(extrap) term of ! 5.823 VAC.

8 Attachments Attachment 1 - Analysis Spreadsheet (22 pages)

Spreadsheet Contents Pages Input Data 1-4 AF-AL Data 5-8 Outliers & Summary 9-10 D-Prime 11-12 Histogram 13-14 Scatter Plot 15 Binning Analysis 16-17 Regression - Drift 18-19 Regression - AV of Drift 20-21 Analyzed Drift (DA) 22 Attachment 2 - DVR Form (8 pages)

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Input Data Page 1 of 22 Seq. AF/ AF / AL ID Tag ID Date Procedure Make/Model AL Setpt Data Units Comments Surveillance interval beyond 1 E22-S004-27N1 2/24/2008 STP-302-1604 General Electric / NGV13B AF 87.0 87.80 VAC requirements. See CR-RBS-2008-01783.

2 E22-S004-27N1 2/24/2008 STP-302-1604 General Electric / NGV13B AL 87.0 88.50 VAC 3 E22-S004-27N1 3/21/2006 STP-302-1604 General Electric / NGV13B AF 87.0 87.90 VAC 4 E22-S004-27N1 3/21/2006 STP-302-1604 General Electric / NGV13B AL 87.0 87.80 VAC 5 E22-S004-27N1 6/17/2004 STP-302-1604 General Electric / NGV13B AF 87.0 87.90 VAC 6 E22-S004-27N1 6/17/2004 STP-302-1604 General Electric / NGV13B AL 87.0 88.02 VAC 7 E22-S004-27N1 5/21/2003 STP-302-1604 General Electric / NGV13B AF 87.0 87.29 VAC 8 E22-S004-27N1 5/21/2003 STP-302-1604 General Electric / NGV13B AL 87.0 87.39 VAC 9 E22-S004-27N1 11/8/2001 STP-302-1604 General Electric / NGV13B AF 87.0 86.98 VAC 10 E22-S004-27N1 11/8/2001 STP-302-1604 General Electric / NGV13B AL 87.0 86.98 VAC 11 E22-S004-27N1 3/8/2000 STP-302-1604 General Electric / NGV13B AF 87.0 88.82 VAC 12 E22-S004-27N1 3/8/2000 STP-302-1604 General Electric / NGV13B AL 87.0 87.13 VAC 13 E22-S004-27N1 4/13/1999 STP-302-1604 General Electric / NGV13B AF 87.0 87.82 VAC 14 E22 S004 27N1 E22-S004-27N1 4/13/1999 STP 302 1604 STP-302-1604 G General l El Electric t i / NGV13B AL 87 0 87.0 88 01 88.01 VAC 15 E22-S004-27N1 8/19/1997 STP-302-1604 General Electric / NGV13B AF 87.0 85.50 VAC 16 E22-S004-27N1 8/19/1997 STP-302-1604 General Electric / NGV13B AL 87.0 85.50 VAC 17 E22-S004-27N1 1/13/1996 STP-302-1604 General Electric / NGV13B AF 87.0 86.70 VAC 18 E22-S004-27N1 1/13/1996 STP-302-1604 General Electric / NGV13B AL 87.0 86.70 VAC 19 E22-S004-27N1 5/20/1994 STP-302-1604 General Electric / NGV13B AF 87.0 86.98 VAC 20 E22-S004-27N1 5/20/1994 STP-302-1604 General Electric / NGV13B AL 87.0 86.96 VAC 21 E22-S004-27N1 7/6/1992 STP-302-1604 General Electric / NGV13B AF 87.0 87.00 VAC 22 E22-S004-27N1 7/6/1992 STP-302-1604 General Electric / NGV13B AL 87.0 87.00 VAC The relay was replaced because of a broken rheostat adjusting wire. Refer 23 E22-S004-27N2 2/24/2008 STP-302-1604 General Electric / NGV13B AF 87.0 FAIL VAC to CR-2008-01550. Also, surveillance interval beyond requirements. See CR-RBS-2008-01783.

24 E22-S004-27N2 2/24/2008 STP-302-1604 General Electric / NGV13B AL 87.0 88.89 VAC 25 E22-S004-27N2 3/21/2006 STP-302-1604 General Electric / NGV13B AF 87.0 90.20 VAC 26 E22-S004-27N2 3/21/2006 STP-302-1604 General Electric / NGV13B AL 87.0 87.40 VAC 27 E22-S004-27N2 6/17/2004 STP-302-1604 General Electric / NGV13B AF 87.0 91.21 VAC 28 E22-S004-27N2 6/17/2004 STP-302-1604 General Electric / NGV13B AL 87.0 87.21 VAC 29 E22-S004-27N2 5/21/2003 STP-302-1604 General Electric / NGV13B AF 87.0 87.00 VAC 30 E22-S004-27N2 5/21/2003 STP-302-1604 General Electric / NGV13B AL 87.0 84.90 VAC 31 E22-S004-27N2 11/8/2001 STP-302-1604 General Electric / NGV13B AF 87.0 83.99 VAC Relay left outside CAL MAX value of 32 E22-S004-27N2 11/8/2001 STP-302-1604 General Electric / NGV13B AL 87.0 89.98 VAC

!89.61 V.

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Input Data Page 2 of 22 Seq. AF/ AF / AL ID Tag ID Date Procedure Make/Model AL Setpt Data Units Comments 33 E22-S004-27N2 3/8/2000 STP-302-1604 General Electric / NGV13B AF 87.0 87.66 VAC 34 E22-S004-27N2 3/8/2000 STP-302-1604 General Electric / NGV13B AL 87.0 87.91 VAC 35 E22-S004-27N2 4/13/1999 STP-302-1604 General Electric / NGV13B AF 87.0 82.90 VAC 36 E22-S004-27N2 4/13/1999 STP-302-1604 General Electric / NGV13B AL 87.0 85.50 VAC 37 E22-S004-27N2 8/19/1997 STP-302-1604 General Electric / NGV13B AF 87.0 86.10 VAC 38 E22-S004-27N2 8/19/1997 STP-302-1604 General Electric / NGV13B AL 87.0 86.00 VAC 39 E22-S004-27N2 1/13/1996 STP-302-1604 General Electric / NGV13B AF 87.0 87.20 VAC 40 E22-S004-27N2 1/13/1996 STP-302-1604 General Electric / NGV13B AL 87.0 87.20 VAC 41 E22-S004-27N2 5/20/1994 STP-302-1604 General Electric / NGV13B AF 87.0 85.98 VAC 42 E22-S004-27N2 5/20/1994 STP-302-1604 General Electric / NGV13B AL 87.0 86.89 VAC 43 E22-S004-27N2 7/6/1992 STP-302-1604 General Electric / NGV13B AF 87.0 86.00 VAC Left outside calibration minimum of 44 E22-S004-27N2 7/6/1992 STP-302-1604 General Electric / NGV13B AL 87.0 86.00 VAC "86.13 VAC.

Surveillance interval beyond 45 E22-S004-27S1 2/24/2008 STP-302-1604 General Electric / NGV13B AF 87.0 89.50 VAC requirements. See CR-RBS-2008-01783.

01783 46 E22-S004-27S1 2/24/2008 STP-302-1604 General Electric / NGV13B AL 87.0 89.55 VAC 47 E22-S004-27S1 3/21/2006 STP-302-1604 General Electric / NGV13B AF 87.0 85.70 VAC 48 E22-S004-27S1 3/21/2006 STP-302-1604 General Electric / NGV13B AL 87.0 85.70 VAC 49 E22-S004-27S1 6/17/2004 STP-302-1604 General Electric / NGV13B AF 87.0 87.90 VAC 50 E22-S004-27S1 6/17/2004 STP-302-1604 General Electric / NGV13B AL 87.0 86.82 VAC 51 E22-S004-27S1 5/21/2003 STP-302-1604 General Electric / NGV13B AF 87.0 86.60 VAC 52 E22-S004-27S1 5/21/2003 STP-302-1604 General Electric / NGV13B AL 87.0 86.40 VAC 53 E22-S004-27S1 11/8/2001 STP-302-1604 General Electric / NGV13B AF 87.0 86.00 VAC 54 E22-S004-27S1 11/8/2001 STP-302-1604 General Electric / NGV13B AL 87.0 85.99 VAC 55 E22-S004-27S1 3/8/2000 STP-302-1604 General Electric / NGV13B AF 87.0 89.86 VAC 56 E22-S004-27S1 3/8/2000 STP-302-1604 General Electric / NGV13B AL 87.0 88.07 VAC 57 E22-S004-27S1 4/13/1999 STP-302-1604 General Electric / NGV13B AF 87.0 87.10 VAC 58 E22-S004-27S1 4/13/1999 STP-302-1604 General Electric / NGV13B AL 87.0 87.70 VAC 59 E22-S004-27S1 8/19/1997 STP-302-1604 General Electric / NGV13B AF 87.0 91.00 VAC Relay left outside CAL MAX value of 60 E22-S004-27S1 8/19/1997 STP-302-1604 General Electric / NGV13B AL 87.0 91.20 VAC

!89.61 V.

61 E22-S004-27S1 1/13/1996 STP-302-1604 General Electric / NGV13B AF 87.0 85.40 VAC 62 E22-S004-27S1 1/13/1996 STP-302-1604 General Electric / NGV13B AL 87.0 87.00 VAC 63 E22-S004-27S1 5/20/1994 STP-302-1604 General Electric / NGV13B AF 87.0 86.84 VAC 64 E22-S004-27S1 5/20/1994 STP-302-1604 General Electric / NGV13B AL 87.0 86.92 VAC 65 E22-S004-27S1 7/6/1992 STP-302-1604 General Electric / NGV13B AF 87.0 86.00 VAC Left outside calibration minimum of 66 E22-S004-27S1 7/6/1992 STP-302-1604 General Electric / NGV13B AL 87.0 86.00 VAC "86.13 VAC.

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Input Data Page 3 of 22 Seq. AF/ AF / AL ID Tag ID Date Procedure Make/Model AL Setpt Data Units Comments Surveillance interval beyond 67 E22-S004-27S2 2/24/2008 STP-302-1604 General Electric / NGV13B AF 87.0 88.00 VAC requirements. See CR-RBS-2008-01783.

68 E22-S004-27S2 2/24/2008 STP-302-1604 General Electric / NGV13B AL 87.0 86.80 VAC 69 E22-S004-27S2 3/21/2006 STP-302-1604 General Electric / NGV13B AF 87.0 85.90 VAC 70 E22-S004-27S2 3/21/2006 STP-302-1604 General Electric / NGV13B AL 87.0 85.20 VAC 71 E22-S004-27S2 6/17/2004 STP-302-1604 General Electric / NGV13B AF 87.0 88.22 VAC 72 E22-S004-27S2 6/17/2004 STP-302-1604 General Electric / NGV13B AL 87.0 88.31 VAC 73 E22-S004-27S2 5/21/2003 STP-302-1604 General Electric / NGV13B AF 87.0 85.20 VAC 74 E22-S004-27S2 5/21/2003 STP-302-1604 General Electric / NGV13B AL 87.0 85.40 VAC 75 E22-S004-27S2 11/8/2001 STP-302-1604 General Electric / NGV13B AF 87.0 86.99 VAC 76 E22-S004-27S2 11/8/2001 STP-302-1604 General Electric / NGV13B AL 87.0 86.99 VAC 77 E22-S004-27S2 3/8/2000 STP-302-1604 General Electric / NGV13B AF 87.0 83.60 VAC 78 E22-S004-27S2 3/8/2000 STP-302-1604 General Electric / NGV13B AL 87.0 86.10 VAC 79 E22-S004-27S2 4/13/1999 STP-302-1604 General Electric / NGV13B AF 87.0 83.80 VAC 80 E22-S004-27S2 4/13/1999 STP-302-1604 General Electric / NGV13B AL 87.0 85.20 VAC 81 E22-S004-27S2 8/19/1997 STP-302-1604 General Electric / NGV13B AF 87.0 91.10 VAC Relay left outside CAL MAX value of 82 E22-S004-27S2 8/19/1997 STP-302-1604 General Electric / NGV13B AL 87.0 91.00 VAC

!89.61 VAC.

83 E22-S004-27S2 1/13/1996 STP-302-1604 General Electric / NGV13B AF 87.0 85.90 VAC 84 E22-S004-27S2 1/13/1996 STP-302-1604 General Electric / NGV13B AL 87.0 87.40 VAC 85 E22-S004-27S2 5/20/1994 STP-302-1604 General Electric / NGV13B AF 87.0 87.30 VAC 86 E22-S004-27S2 5/20/1994 STP-302-1604 General Electric / NGV13B AL 87.0 86.98 VAC 87 E22-S004-27S2 7/6/1992 STP-302-1604 General Electric / NGV13B AF 87.0 86.00 VAC Left outside calibration minimum of 88 E22-S004-27S2 7/6/1992 STP-302-1604 General Electric / NGV13B AL 87.0 86.00 VAC "86.13 VAC.

Surveillance interval beyond 89 E22-S004-27S3 2/24/2008 STP-302-1604 General Electric / NGV13B AF 87.0 87.90 VAC requirements. See CR-RBS-2008-01783.

90 E22-S004-27S3 2/24/2008 STP-302-1604 General Electric / NGV13B AL 87.0 88.75 VAC Relay replaced due to expired date 91 E22-S004-27S3 3/21/2006 STP-302-1604 General Electric / NGV13B AF 87.0 85.40 VAC code. AF data from old relay.

92 E22-S004-27S3 3/21/2006 STP-302-1604 General Electric / NGV13B AL 87.0 85.90 VAC 93 E22-S004-27S3 6/17/2004 STP-302-1604 General Electric / NGV13B AF 87.0 89.40 VAC 94 E22-S004-27S3 6/17/2004 STP-302-1604 General Electric / NGV13B AL 87.0 89.20 VAC 95 E22-S004-27S3 5/21/2003 STP-302-1604 General Electric / NGV13B AF 87.0 88.10 VAC 96 E22-S004-27S3 5/21/2003 STP-302-1604 General Electric / NGV13B AL 87.0 86.81 VAC 97 E22-S004-27S3 11/8/2001 STP-302-1604 General Electric / NGV13B AF 87.0 87.98 VAC 98 E22-S004-27S3 11/8/2001 STP-302-1604 General Electric / NGV13B AL 87.0 87.99 VAC 99 E22-S004-27S3 3/8/2000 STP-302-1604 General Electric / NGV13B AF 87.0 85.96 VAC

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Input Data Page 4 of 22 Seq. AF/ AF / AL ID Tag ID Date Procedure Make/Model AL Setpt Data Units Comments 100 E22-S004-27S3 3/8/2000 STP-302-1604 General Electric / NGV13B AL 87.0 85.73 VAC 101 E22-S004-27S3 4/13/1999 STP-302-1604 General Electric / NGV13B AF 87.0 86.50 VAC 102 E22-S004-27S3 4/13/1999 STP-302-1604 General Electric / NGV13B AL 87.0 85.10 VAC 103 E22-S004-27S3 8/19/1997 STP-302-1604 General Electric / NGV13B AF 87.0 86.20 VAC 104 E22-S004-27S3 8/19/1997 STP-302-1604 General Electric / NGV13B AL 87.0 86.00 VAC 105 E22-S004-27S3 1/13/1996 STP-302-1604 General Electric / NGV13B AF 87.0 87.30 VAC 106 E22-S004-27S3 1/13/1996 STP-302-1604 General Electric / NGV13B AL 87.0 87.30 VAC 107 E22-S004-27S3 5/20/1994 STP-302-1604 General Electric / NGV13B AF 87.0 87.71 VAC 108 E22-S004-27S3 5/20/1994 STP-302-1604 General Electric / NGV13B AL 87.0 87.30 VAC 109 E22-S004-27S3 7/6/1992 STP-302-1604 General Electric / NGV13B AF 87.0 86.00 VAC Left outside calibration minimum of 110 E22-S004-27S3 7/6/1992 STP-302-1604 General Electric / NGV13B AL 87.0 86.00 VAC "86.13 VAC.

Surveillance interval beyond 111 E22-S004-27S4 2/24/2008 STP-302-1604 General Electric / NGV13B AF 87.0 84.65 VAC requirements. See CR-RBS-2008-01783.

112 E22 S004 27S4 E22-S004-27S4 2/24/2008 STP 302 1604 STP-302-1604 G General l El Electric t i / NGV13B AL 87 0 87.0 85 65 85.65 VAC Relay replaced due to expired date 113 E22-S004-27S4 3/21/2006 STP-302-1604 General Electric / NGV13B AF 87.0 85.70 VAC code. AF data from old relay.

114 E22-S004-27S4 3/21/2006 STP-302-1604 General Electric / NGV13B AL 87.0 86.70 VAC 115 E22-S004-27S4 6/17/2004 STP-302-1604 General Electric / NGV13B AF 87.0 85.90 VAC 116 E22-S004-27S4 6/17/2004 STP-302-1604 General Electric / NGV13B AL 87.0 86.12 VAC 117 E22-S004-27S4 5/21/2003 STP-302-1604 General Electric / NGV13B AF 87.0 84.91 VAC 118 E22-S004-27S4 5/21/2003 STP-302-1604 General Electric / NGV13B AL 87.0 85.01 VAC 119 E22-S004-27S4 11/8/2001 STP-302-1604 General Electric / NGV13B AF 87.0 85.00 VAC 120 E22-S004-27S4 11/8/2001 STP-302-1604 General Electric / NGV13B AL 87.0 84.99 VAC 121 E22-S004-27S4 3/8/2000 STP-302-1604 General Electric / NGV13B AF 87.0 84.26 VAC 122 E22-S004-27S4 3/8/2000 STP-302-1604 General Electric / NGV13B AL 87.0 86.40 VAC 123 E22-S004-27S4 4/13/1999 STP-302-1604 General Electric / NGV13B AF 87.0 83.10 VAC 124 E22-S004-27S4 4/13/1999 STP-302-1604 General Electric / NGV13B AL 87.0 84.71 VAC 125 E22-S004-27S4 8/19/1997 STP-302-1604 General Electric / NGV13B AF 87.0 86.50 VAC 126 E22-S004-27S4 8/19/1997 STP-302-1604 General Electric / NGV13B AL 87.0 86.50 VAC 127 E22-S004-27S4 1/13/1996 STP-302-1604 General Electric / NGV13B AF 87.0 88.20 VAC 128 E22-S004-27S4 1/13/1996 STP-302-1604 General Electric / NGV13B AL 87.0 87.40 VAC 129 E22-S004-27S4 5/20/1994 STP-302-1604 General Electric / NGV13B AF 87.0 87.63 VAC 130 E22-S004-27S4 5/20/1994 STP-302-1604 General Electric / NGV13B AL 87.0 87.54 VAC 131 E22-S004-27S4 7/6/1992 STP-302-1604 General Electric / NGV13B AF 87.0 86.00 VAC Left outside calibration minimum of 132 E22-S004-27S4 7/6/1992 STP-302-1604 General Electric / NGV13B AL 87.0 86.00 VAC "86.13 VAC.

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 AF-AL Data Page 5 of 22 CAL INTERVAL = DRIFT = (Current CAL INTERVAL =

AF/AL DATA OUTLIERS Seq. CAL DATE AF/AL (Current Date - Seq. Cal AF Data - (Current Date -

VALUE COMMENTS Previous Date) Prev Cal AL Data) Previous Date)

ID Make/Model Number Tag ID mm/dd/yy Status (VAC) Days Months ID Tag Number (VAC) Days Months 1 General Electric / NGV13B E22-S004-27N1 02/24/08 AF 87.80 705 23.2 1 E22-S004-27N1 0.00 705 23.2 2 General Electric / NGV13B E22-S004-27N1 02/24/08 AL 88.50 3 E22-S004-27N1 -0.12 642 21.1 3 General Electric / NGV13B E22-S004-27N1 03/21/06 AF 87.90 642 21.1 5 E22-S004-27N1 0.51 393 12.9 4 General Electric / NGV13B E22-S004-27N1 03/21/06 AL 87.80 7 E22-S004-27N1 0.31 559 18.4 5 General Electric / NGV13B E22-S004-27N1 06/17/04 AF 87.90 393 12.9 9 E22-S004-27N1 -0.15 610 20.0 6 General Electric / NGV13B E22-S004-27N1 06/17/04 AL 88.02 11 E22-S004-27N1 0.81 330 10.8 7 General Electric / NGV13B E22-S004-27N1 05/21/03 AF 87.29 559 18.4 13 E22-S004-27N1 2.32 602 19.8 8 General Electric / NGV13B E22-S004-27N1 05/21/03 AL 87.39 15 E22-S004-27N1 -1.20 584 19.2 9 General Electric / NGV13B E22-S004-27N1 11/08/01 AF 86.98 610 20.0 17 E22-S004-27N1 -0.26 603 19.8 10 General Electric / NGV13B E22-S004-27N1 11/08/01 AL 86.98 19 E22-S004-27N1 -0.02 683 22.4 11 General Electric / NGV13B E22-S004-27N1 03/08/00 AF 88.82 330 10.8 12 General Electric / NGV13B E22-S004-27N1 03/08/00 AL 87.13 13 General Electric / NGV13B E22-S004-27N1 04/13/99 AF 87.82 602 19.8 25 E22-S004-27N2 2.99 642 21.1 14 General Electric / NGV13B E22-S004-27N1 04/13/99 AL 88.01 27 E22-S004-27N2 6.31 393 12.9 15 General Electric / NGV13B E22-S004-27N1 08/19/97 AF 85.50 584 19.2 29 E22-S004-27N2 -2.98 559 18.4 16 General Electric / NGV13B E22-S004-27N1 08/19/97 AL 85.50 31 E22-S004-27N2 -3.92 610 20.0 17 General Electric / NGV13B E22-S004-27N1 01/13/96 AF 86.70 603 19.8 33 E22-S004-27N2 2.16 330 10.8 18 General Electric / NGV13B E22-S004-27N1 01/13/96 AL 86.70 35 E22-S004-27N2 -3.10 602 19.8 19 General Electric / NGV13B E22-S004-27N1 05/20/94 AF 86.98 683 22.4 37 E22-S004-27N2 -1.10 584 19.2 20 General Electric / NGV13B E22-S004-27N1 05/20/94 AL 86.96 39 E22-S004-27N2 0.31 603 19.8 21 General Electric / NGV13B E22-S004-27N1 07/06/92 AF 87.00 41 E22-S004-27N2 -0.02 683 22.4 22 General Electric / NGV13B E22-S004-27N1 07/06/92 AL 87.00 23 General Electric / NGV13B E22-S004-27N2 02/24/08 AF FAIL 705 23.2 45 E22-S004-27S1 3.80 705 23.2 24 General Electric / NGV13B E22-S004-27N2 02/24/08 AL 88.89 47 E22-S004-27S1 -1.12 642 21.1 25 General Electric / NGV13B E22-S004-27N2 03/21/06 AF 90.20 642 21.1 49 E22-S004-27S1 1.50 393 12.9 26 General Electric / NGV13B E22-S004-27N2 03/21/06 AL 87.40 51 E22-S004-27S1 0.61 559 18.4 27 General Electric / NGV13B E22-S004-27N2 06/17/04 AF 91.21 393 12.9 53 E22-S004-27S1 -2.07 610 20.0 28 General Electric / NGV13B E22-S004-27N2 06/17/04 AL 87.21 55 E22-S004-27S1 2.16 330 10.8 29 General Electric / NGV13B E22-S004-27N2 05/21/03 AF 87.00 559 18.4 57 E22-S004-27S1 -4.10 602 19.8 30 General Electric / NGV13B E22-S004-27N2 05/21/03 AL 84.90 59 E22-S004-27S1 4.00 584 19.2 31 General Electric / NGV13B E22-S004-27N2 11/08/01 AF 83.99 610 20.0 61 E22-S004-27S1 -1.52 603 19.8 32 General Electric / NGV13B E22-S004-27N2 11/08/01 AL 89.98 63 E22-S004-27S1 0.84 683 22.4 33 General Electric / NGV13B E22-S004-27N2 03/08/00 AF 87.66 330 10.8 34 General Electric / NGV13B E22-S004-27N2 03/08/00 AL 87.91 67 E22-S004-27S2 2.80 705 23.2 35 General Electric / NGV13B E22-S004-27N2 04/13/99 AF 82.90 602 19.8 69 E22-S004-27S2 -2.41 642 21.1 36 General Electric / NGV13B E22-S004-27N2 04/13/99 AL 85.50 71 E22-S004-27S2 2.82 393 12.9 37 General Electric / NGV13B E22-S004-27N2 08/19/97 AF 86.10 584 19.2 73 E22-S004-27S2 -1.79 559 18.4

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 AF-AL Data Page 6 of 22 CAL INTERVAL = DRIFT = (Current CAL INTERVAL =

AF/AL DATA OUTLIERS Seq. CAL DATE AF/AL (Current Date - Seq. Cal AF Data - (Current Date -

VALUE COMMENTS Previous Date) Prev Cal AL Data) Previous Date)

ID Make/Model Number Tag ID mm/dd/yy Status (VAC) Days Months ID Tag Number (VAC) Days Months 38 General Electric / NGV13B E22-S004-27N2 08/19/97 AL 86.00 75 E22-S004-27S2 0.89 610 20.0 39 General Electric / NGV13B E22-S004-27N2 01/13/96 AF 87.20 603 19.8 77 E22-S004-27S2 -1.60 330 10.8 40 General Electric / NGV13B E22-S004-27N2 01/13/96 AL 87.20 79 E22-S004-27S2 -7.20 602 19.8 41 General Electric / NGV13B E22-S004-27N2 05/20/94 AF 85.98 683 22.4 81 E22-S004-27S2 3.70 584 19.2 42 General Electric / NGV13B E22-S004-27N2 05/20/94 AL 86.89 83 E22-S004-27S2 -1.08 603 19.8 43 General Electric / NGV13B E22-S004-27N2 07/06/92 AF 86.00 85 E22-S004-27S2 1.30 683 22.4 44 General Electric / NGV13B E22-S004-27N2 07/06/92 AL 86.00 45 General Electric / NGV13B E22-S004-27S1 02/24/08 AF 89.50 705 23.2 89 E22-S004-27S3 2.00 705 23.2 46 General Electric / NGV13B E22-S004-27S1 02/24/08 AL 89.55 91 E22-S004-27S3 -3.80 642 21.1 47 General Electric / NGV13B E22-S004-27S1 03/21/06 AF 85.70 642 21.1 93 E22-S004-27S3 2.59 393 12.9 48 General Electric / NGV13B E22-S004-27S1 03/21/06 AL 85.70 95 E22-S004-27S3 0.11 559 18.4 49 General Electric / NGV13B E22-S004-27S1 06/17/04 AF 87.90 393 12.9 97 E22-S004-27S3 2.25 610 20.0 50 General Electric / NGV13B E22-S004-27S1 E22 S004 27S1 06/17/04 AL 86.82 99 E22-S004-27S3 0.86 330 10.8 51 General Electric / NGV13B E22-S004-27S1 05/21/03 AF 86.60 559 18.4 101 E22-S004-27S3 0.50 602 19.8 52 General Electric / NGV13B E22-S004-27S1 05/21/03 AL 86.40 103 E22-S004-27S3 -1.10 584 19.2 53 General Electric / NGV13B E22-S004-27S1 11/08/01 AF 86.00 610 20.0 105 E22-S004-27S3 0.00 603 19.8 54 General Electric / NGV13B E22-S004-27S1 11/08/01 AL 85.99 107 E22-S004-27S3 1.71 683 22.4 55 General Electric / NGV13B E22-S004-27S1 03/08/00 AF 89.86 330 10.8 56 General Electric / NGV13B E22-S004-27S1 03/08/00 AL 88.07 111 E22-S004-27S4 -2.05 705 23.2 57 General Electric / NGV13B E22-S004-27S1 04/13/99 AF 87.10 602 19.8 113 E22-S004-27S4 -0.42 642 21.1 58 General Electric / NGV13B E22-S004-27S1 04/13/99 AL 87.70 115 E22-S004-27S4 0.89 393 12.9 59 General Electric / NGV13B E22-S004-27S1 08/19/97 AF 91.00 584 19.2 117 E22-S004-27S4 -0.08 559 18.4 60 General Electric / NGV13B E22-S004-27S1 08/19/97 AL 91.20 119 E22-S004-27S4 -1.40 610 20.0 61 General Electric / NGV13B E22-S004-27S1 01/13/96 AF 85.40 603 19.8 121 E22-S004-27S4 -0.45 330 10.8 62 General Electric / NGV13B E22-S004-27S1 01/13/96 AL 87.00 123 E22-S004-27S4 -3.40 602 19.8 63 General Electric / NGV13B E22-S004-27S1 05/20/94 AF 86.84 683 22.4 125 E22-S004-27S4 -0.90 584 19.2 64 General Electric / NGV13B E22-S004-27S1 05/20/94 AL 86.92 127 E22-S004-27S4 0.66 603 19.8 65 General Electric / NGV13B E22-S004-27S1 07/06/92 AF 86.00 129 E22-S004-27S4 1.63 683 22.4 66 General Electric / NGV13B E22-S004-27S1 07/06/92 AL 86.00 67 General Electric / NGV13B E22-S004-27S2 02/24/08 AF 88.00 705 23.2 68 General Electric / NGV13B E22-S004-27S2 02/24/08 AL 86.80 69 General Electric / NGV13B E22-S004-27S2 03/21/06 AF 85.90 642 21.1 70 General Electric / NGV13B E22-S004-27S2 03/21/06 AL 85.20 71 General Electric / NGV13B E22-S004-27S2 06/17/04 AF 88.22 393 12.9 72 General Electric / NGV13B E22-S004-27S2 06/17/04 AL 88.31 73 General Electric / NGV13B E22-S004-27S2 05/21/03 AF 85.20 559 18.4 74 General Electric / NGV13B E22-S004-27S2 05/21/03 AL 85.40

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 AF-AL Data Page 7 of 22 CAL INTERVAL = DRIFT = (Current CAL INTERVAL =

AF/AL DATA OUTLIERS Seq. CAL DATE AF/AL (Current Date - Seq. Cal AF Data - (Current Date -

VALUE COMMENTS Previous Date) Prev Cal AL Data) Previous Date)

ID Make/Model Number Tag ID mm/dd/yy Status (VAC) Days Months ID Tag Number (VAC) Days Months 75 General Electric / NGV13B E22-S004-27S2 11/08/01 AF 86.99 610 20.0 76 General Electric / NGV13B E22-S004-27S2 11/08/01 AL 86.99 77 General Electric / NGV13B E22-S004-27S2 03/08/00 AF 83.60 330 10.8 78 General Electric / NGV13B E22-S004-27S2 03/08/00 AL 86.10 Outlier 79 General Electric / NGV13B E22-S004-27S2 04/13/99 AF 83.80 Detected and 602 19.8 Removed 80 General Electric / NGV13B E22-S004-27S2 04/13/99 AL 85.20 81 General Electric / NGV13B E22-S004-27S2 08/19/97 AF 91.10 584 19.2 82 General Electric / NGV13B E22-S004-27S2 08/19/97 AL 91.00 83 General Electric / NGV13B E22-S004-27S2 01/13/96 AF 85.90 603 19.8 84 General Electric / NGV13B E22-S004-27S2 01/13/96 AL 87.40 85 General Electric / NGV13B E22-S004-27S2 05/20/94 AF 87.30 683 22.4 86 General Electric / NGV13B E22-S004-27S2 05/20/94 AL 86.98 87 General Electric / NGV13B E22-S004-27S2 07/06/92 AF 86.00 88 General Electric / NGV13B E22-S004-27S2 07/06/92 AL 86.00 89 General Electric / NGV13B E22-S004-27S3 02/24/08 AF 87.90 705 23.2 90 General Electric / NGV13B E22-S004-27S3 02/24/08 AL 88.75 91 General Electric / NGV13B E22-S004-27S3 03/21/06 AF 85.40 642 21.1 92 General Electric / NGV13B E22-S004-27S3 03/21/06 AL 85.90 93 General Electric / NGV13B E22-S004-27S3 06/17/04 AF 89.40 393 12.9 94 General Electric / NGV13B E22-S004-27S3 06/17/04 AL 89.20 95 General Electric / NGV13B E22-S004-27S3 05/21/03 AF 88.10 559 18.4 96 General Electric / NGV13B E22-S004-27S3 05/21/03 AL 86.81 97 General Electric / NGV13B E22-S004-27S3 11/08/01 AF 87.98 610 20.0 98 General Electric / NGV13B E22-S004-27S3 11/08/01 AL 87.99 99 General Electric / NGV13B E22-S004-27S3 03/08/00 AF 85.96 330 10.8 100 General Electric / NGV13B E22-S004-27S3 03/08/00 AL 85.73 101 General Electric / NGV13B E22-S004-27S3 04/13/99 AF 86.50 602 19.8 102 General Electric / NGV13B E22-S004-27S3 04/13/99 AL 85.10 103 General Electric / NGV13B E22-S004-27S3 08/19/97 AF 86.20 584 19.2 104 General Electric / NGV13B E22-S004-27S3 08/19/97 AL 86.00 105 General Electric / NGV13B E22-S004-27S3 01/13/96 AF 87.30 603 19.8 106 General Electric / NGV13B E22-S004-27S3 01/13/96 AL 87.30 107 General Electric / NGV13B E22-S004-27S3 05/20/94 AF 87.71 683 22.4 108 General Electric / NGV13B E22-S004-27S3 05/20/94 AL 87.30 109 General Electric / NGV13B E22-S004-27S3 07/06/92 AF 86.00

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 AF-AL Data Page 8 of 22 CAL INTERVAL = DRIFT = (Current CAL INTERVAL =

AF/AL DATA OUTLIERS Seq. CAL DATE AF/AL (Current Date - Seq. Cal AF Data - (Current Date -

VALUE COMMENTS Previous Date) Prev Cal AL Data) Previous Date)

ID Make/Model Number Tag ID mm/dd/yy Status (VAC) Days Months ID Tag Number (VAC) Days Months 110 General Electric / NGV13B E22-S004-27S3 07/06/92 AL 86.00 111 General Electric / NGV13B E22-S004-27S4 02/24/08 AF 84.65 705 23.2 112 General Electric / NGV13B E22-S004-27S4 02/24/08 AL 85.65 113 General Electric / NGV13B E22-S004-27S4 03/21/06 AF 85.70 642 21.1 114 General Electric / NGV13B E22-S004-27S4 03/21/06 AL 86.70 115 General Electric / NGV13B E22-S004-27S4 06/17/04 AF 85.90 393 12.9 116 General Electric / NGV13B E22-S004-27S4 06/17/04 AL 86.12 117 General Electric / NGV13B E22-S004-27S4 05/21/03 AF 84.91 559 18.4 118 General Electric / NGV13B E22-S004-27S4 05/21/03 AL 85.01 119 General Electric / NGV13B E22-S004-27S4 11/08/01 AF 85.00 610 20.0 120 General Electric / NGV13B E22-S004-27S4 11/08/01 AL 84.99 121 General Electric / NGV13B E22-S004-27S4 03/08/00 AF 84.26 330 10.8 122 General Electric / NGV13B E22-S004-27S4 E22 S004 27S4 03/08/00 AL 86.40 123 General Electric / NGV13B E22-S004-27S4 04/13/99 AF 83.10 602 19.8 124 General Electric / NGV13B E22-S004-27S4 04/13/99 AL 84.71 125 General Electric / NGV13B E22-S004-27S4 08/19/97 AF 86.50 584 19.2 126 General Electric / NGV13B E22-S004-27S4 08/19/97 AL 86.50 127 General Electric / NGV13B E22-S004-27S4 01/13/96 AF 88.20 603 19.8 128 General Electric / NGV13B E22-S004-27S4 01/13/96 AL 87.40 129 General Electric / NGV13B E22-S004-27S4 05/20/94 AF 87.63 683 22.4 130 General Electric / NGV13B E22-S004-27S4 05/20/94 AL 87.54 131 General Electric / NGV13B E22-S004-27S4 07/06/92 AF 86.00 132 General Electric / NGV13B E22-S004-27S4 07/06/92 AL 86.00

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Outliers & Summary Page 9 of 22 Extreme Cal Interval Final Drift Data Cal Interval Seq. ID Tag ID Drift (VAC) Studentized (Days) Set (VAC) (Days)

Deviate (T) 1 E22-S004-27N1 0.00 705 0.029 0.00 705 3 E22-S004-27N1 -0.12 642 0.081 Raw Drift Data Statistics Summary -0.12 642 5 E22-S004-27N1 0.51 393 0.190 (Initial Data Set) 0.51 393 7 E22-S004-27N1 0.31 559 0.104 Mean (Average) 0.0675 0.31 559 9 E22-S004-27N1 -0.15 610 0.093 Variance 5.4145 -0.15 610 11 E22-S004-27N1 0.81 330 0.319 Std. Dev. 2.3269 0.81 330 13 E22-S004-27N1 2.32 602 0.968 Sample Size (Count) 59 2.32 602 15 E22-S004-27N1 -1.20 584 0.545 Maximum 6.31 -1.20 584 17 E22-S004-27N1 -0.26 603 0.141 Median 0.00 -0.26 603 19 E22-S004-27N1 -0.02 683 0.038 Minimum -7.20 -0.02 683 Range 13.51 Sum 3.980 25 E22-S004-27N2 2.99 642 1.256 Kurtosis 1.074 2.99 642 27 E22-S004-27N2 6.31 393 2.683 Skewness -0.272 6.31 393 29 E22-S004-27N2 -2.98 559 1.310 -2.98 559 31 E22-S004-27N2 -3.92 610 1.714 Critical T-Value (Upper 5% Signif.) 3.03 -3.92 610 33 E22-S004-27N2 2.16 330 0.899 2.16 330 35 E22-S004-27N2 -3.10 602 1.361 Equation for Each Studentized Deviate: T= lDrift-Meanl/Std. Dev. -3.10 602 37 E22-S004-27N2 -1.10 584 0.502 Crit T Value Lookup Value from Ref. 4.1.3 Table 2, per sample -1.10 584 39 E22-S004-27N2 0.31 603 0.104 size. See Sections 3.6.1 and 3.6.2 of Reference 4.1.3. 0.31 603 41 E22-S004-27N2 -0.02 683 0.038 Outliers will be Denoted as such in "Final Data Set" column. -0.02 683 One Outlier Detected and Removed - Seq. 79 45 E22-S004-27S1 3.80 705 1.604 3.80 705 47 E22-S004-27S1 -1.12 642 0.510 Drift Data Statistics Summary -1.12 642 49 E22-S004-27S1 1.50 393 0.616 (Final Data Set) 1.50 393 51 E22-S004-27S1 0.61 559 0.233 Mean (Average) 0.1928 0.61 559 53 E22-S004-27S1 -2.07 610 0.919 Variance 4.5669 -2.07 610 55 E22-S004-27S1 2.16 330 0.899 Std. Dev. 2.1370 2.16 330 57 E22-S004-27S1 -4.10 602 1.791 Sample Size (Count) 58 -4.10 602 59 E22-S004-27S1 4.00 584 1.690 Maximum 6.31 4.00 584 61 E22-S004-27S1 -1.52 603 0.682 Median 0.05 -1.52 603 63 E22-S004-27S1 0.84 683 0.332 Minimum -4.10 0.84 683 Range 10.41 67 E22-S004-27S2 2.80 705 1.174 Sum 11.180 2.80 705 69 E22-S004-27S2 -2.41 642 1.065 Kurtosis 0.231 -2.41 642 71 E22-S004-27S2 2.82 393 1.183 Skewness 0.175 2.82 393 73 E22-S004-27S2 -1.79 559 0.798 -1.79 559 75 E22-S004-27S2 0.89 610 0.353 0.89 610 77 E22-S004-27S2 -1.60 330 0.717 -1.60 330

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Outliers & Summary Page 10 of 22 Extreme Cal Interval Final Drift Data Cal Interval Seq. ID Tag ID Drift (VAC) Studentized (Days) Set (VAC) (Days)

Deviate (T) 79 E22-S004-27S2 -7.20 602 3.123 OUTLIER OUTLIER 81 E22-S004-27S2 3.70 584 1.561 3.70 584 83 E22-S004-27S2 -1.08 603 0.493 -1.08 603 85 E22-S004-27S2 1.30 683 0.530 1.30 683 89 E22-S004-27S3 2.00 705 0.831 2.00 705 91 E22-S004-27S3 -3.80 642 1.662 -3.80 642 93 E22-S004-27S3 2.59 393 1.084 2.59 393 95 E22-S004-27S3 0.11 559 0.018 0.11 559 97 E22-S004-27S3 2.25 610 0.938 2.25 610 99 E22-S004-27S3 0.86 330 0.341 0.86 330 101 E22-S004-27S3 0.50 602 0.186 0.50 602 103 E22-S004-27S3 -1.10 584 0.502 -1.10 584 105 E22-S004-27S3 0.00 603 0.029 0.00 603 107 E22-S004-27S3 1.71 683 0.706 1.71 683 111 E22-S004-27S4 -2.05 705 0.910 -2.05 705 113 E22-S004-27S4 -0.42 642 0.209 -0.42 642 115 E22-S004-27S4 0.89 393 0.353 0.89 393 117 E22-S004-27S4 -0.08 559 0.063 -0.08 559 119 E22-S004-27S4 -1.40 610 0.631 -1.40 610 121 E22-S004-27S4 -0.45 330 0.222 -0.45 330 123 E22-S004-27S4 -3.40 602 1.490 -3.40 602 125 E22-S004-27S4 -0.90 584 0.416 -0.90 584 127 E22-S004-27S4 0.66 603 0.255 0.66 603 129 E22-S004-27S4 1.63 683 0.672 1.63 683

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 D-Prime Page 11 of 22 Drift Seq. D' Values No. Statistic

-4.10 1 116.9

-3.92 2 107.8

-3.80 3 100.7 Specific D Prime Normality Test Methodology from Section 3.7.3 of Reference 4.1.3

-3.40 4 86.7

-3.10 5 75.9 Steps to Perform:

-2.98 6 70.0 1. Paste all final drift data into column 1.

-2.41 7 54.2 2. Sort in ascending order.

-2.07 8 44.5 3. Assign each data point a sequential ascending ID#.

-2.05 9 42.0 4. Calculate S2 taking the variance of the drift data adjusted by (Count-1)

-1.79 10 34.9

-1.60 11 29.6 S2 = (n-1)(Variance (Drift))

-1.52 12 26.6

-1.40 13 23.1 where: n = Count

-1.20 14 18.6

-1.12 15 16.2

-1.10 16 14.9 5. Calculate S by taking SQRT(S2)

-1.10 17 13.7 6. Find each D' statistic in Col C (Formula From Section 3.7.3.1 of Ref. 4.1.3.)

-1.08 18 12.4

-0.90 19 9.5 D' Stat = {i-[(n+1)/2]}xi

-0.45 20 4.3

-0.42 21 3.6 where: i = Sequential Number of Drift Value

-0.26 22 1.9 n = Count

-0.15 23 1.0 xi = Drift Value Associated with the Sequential Number

-0.12 24 0.7

-0.08 25 0.4 7. Calculate T by summation of all of the D' Statistics.

-0.02 26 0.1 8. Calculate D' and compare to allowed values in Ref. 4.1.7. (Formula From

-0.02 27 0.0 Section 3.7.3.1 of Ref. 4.1.3.)

0.00 28 0.0 0.00 29 0.0 D' = T / S 0.11 30 0.1 0.31 31 0.5 0.31 32 0.8 0.50 33 1.8 0.51 34 2.3 0.61 35 3.4 0.66 36 4.3 0.81 37 6.1 0.84 38 7.1 0.86 39 8.2

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 D-Prime Page 12 of 22 Drift Seq. D' Values No. Statistic 0.89 40 9.3 0.89 41 10.2 1.30 42 16.3 1.50 43 20.3 1.63 44 23.6 1.71 45 26.5 2.00 46 33.0 2.16 47 37.8 Computed Values 2.16 48 40.0 S2 = 260.3 2.25 49 43.9 S= 16.1 2.32 50 47.6 T= 1996.1 2.59 51 55.7 Count (n): 58 2.80 52 63.0 D' = T/S = 123.7 2.82 53 66.3 2.99 54 73.3 Critical D' Values 3 70 3.70 55 94 3 94.3 Minimum (P0.025 0 025) : 119 9 119.9 3.80 56 100.7 Maximum (P0.975) : 126.5 4.00 57 110.0 (Ref. 4.1.7) 6.31 58 179.8 Is P0.025 ! D' ! P0.975? : Yes Normality Assumption Rejected?: No RESULTS:

Since the calculated D' (123.7) is within the acceptable range for 58 Data Points (119.9 to 126.5), this test does not reject the assumption of normality for this data set.

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Histogram Page 13 of 22 Normal Cumulative Expected Bin No. StDev Bin Maximums = Observed Distribution Bin Descriptions Probability (CPi) Frequency No. (NS) Mean + (NS*StDev) Frequency Probability (Table 18-2 Ref 4.1.4) (Ei = Pnorm*N)

(Pnorm = CPi-CPi-1) 1 Up to - 2.5 Standard Deviations from Mean -2.5 -5.150 0 0.0062 0.0062 0.3596 2 -2.5 to -2.0 Standard Deviations from Mean -2.0 -4.081 1 0.0228 0.0166 0.9599 3 -2.0 to -1.5 Standard Deviations from Mean -1.5 -3.013 4 0.0668 0.0441 2.5549 4 -1.5 to -1.0 Standard Deviations from Mean -1.0 -1.944 4 0.1587 0.0919 5.3273 5 -1.0 to -0.5 Standard Deviations from Mean -0.5 -0.876 10 0.3086 0.1499 8.6942 6 -0.5 Standard Deviations from Mean to Mean 0.0 0.193 11 0.5000 0.1915 11.1041 7 Mean to +0.5 Standard Deviations from Mean 0.5 1.261 11 0.6915 0.1915 11.1041 8 +0.5 to +1.0 Standard Deviations from Mean 1.0 2.330 9 0.8414 0.1499 8.6942 9 +1.0 to +1.5 Standard Deviations from Mean 1.5 3.398 4 0.9332 0.0919 5.3273 10 +1.5 to +2.0 Standard Deviations from Mean 2.0 4.467 3 0.9773 0.0441 2.5549 11 +2.0 to +2.5 Standard Deviations from Mean 2.5 5.535 0 0.9938 0.0166 0.9599 12 More than Mean + 2.5 Standard Deviations More More 1 1.0000 0.0062 0.3596 Totals 58 58 Percentage for Observed Observed

+/- Sigma Bounds Normal Drift Values Percentages Distribution 2.5 (Bins 2-11) 57 98.28% Mean 0.1928 2 (Bins 3-10) 56 96.55% 95.45% Std. Dev. 2.1370 1.5 (Bins 4-9) 49 84.48% Sample Size 58 1 (Bins 5-8) 41 70.69% 68.27%

0.5 (Bins 6-7) 22 37.93%

Methodology for Histogram Taken from Section 19 of Reference 4.1.4 and Section 3.7.5 of Reference 4.1.3

1. Order the drift data in ascending order.
2. Obtain mean, standard deviation, and sample size.
3. Establishing bins in 1/2 sigma increments from the mean to 2.5 sigma in both directions, derive the upper bin limits, in units of drift, based on the values of the mean and standard deviation.
4. Obtain expected frequency for a normal distribution in each bin.
5. Manually compute the number of observed drift data points within each bin, and list under observed frequency.
6. Plot the Expected Frequency and the Observed Frequency Data on the Histogram for comparison to each other.

Results: Since the data passed the D Prime for normality, a Coverage Analysis is not necessary. The Histogram shows that the data conforms closely to a normal distribution.

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Histogram Page 14 of 22 Histogram of Drift - River Bend Station General Electric NGV13B Undervoltage Relays 12 Observed 10 Frequency Normal Distribution 8

Population n

6 4

2 0

-5.150 -4.081 -3.013 -1.944 -0.876 0.193 1.261 2.330 3.398 4.467 5.535 More Drift (VAC)

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Scatter Plot Page 15 of 22 Scatter Plot - River Bend Station General Electric NGV13B Undervoltage Relays 8

Linear (Drift) 6 y = -0.0037x + 2.272 4

Drift (VAC C) 2 0

-2

-4

-6 300 350 400 450 500 550 600 650 700 750 Time (Days)

Note: Equation on Scatter Plot is computer generated, based on the associated trend line.

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Binning Analysis Page 16 of 22 Bin Statistics Bin 1 Bin 2 Bin 3 Bin 4 Bin 5 Bin 6 Bin 7 Count 0 0 0 12 41 5 0 Standard Dev. 1.9670 1.9748 2.3400 Mean 1.5467 -0.3398 1.3100 Mean Interval 361.50 612.10 705.00 Max Interval 393 683 705 Bin Definition and Selection Bin Hi Limit Bin Population Bins Bins (Days) Count Percentage Included 1 45 0 0 0%

0.0%

2 135 0 0.0%

3 230 0 0.0%

4 460 12 20.7% 4 5 690 41 70.7% 5 6 915 5 8.6%

7 Over 0 0.0%

Total Count: 58 100%

See Section 3.8.3 of Reference 4.1.3 for Binning Analysis Methodology.

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Binning Analysis Page 17 of 22 Graph Summary Bin Time Std Dev Mean Binning Analysis - River Bend Station 4 361.50 1.9670 1.5467 General Electric NGV13B Undervoltage Relays 5 612.10 1.9748 -0.3398 Std Dev Mean Test of Variances 2.5 F Critical 2.531 Variance Ratio 1.008 2.0 Potential Strong TD of No 1.5 Random Drift?

Drift (VAC C) 1.0 0.5 0.0

-0.5 300 400 500 600 700 Time (Days)

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Regression - Drift Page 18 of 22 Regression Analysis - Drift REGRESSION ANALYSIS F Critical

SUMMARY

OUTPUT 3.161861 Regression Statistics Multiple R 0.197105 R Square 0.038850 Adjusted R Square 0.021687 Standard Error 2.113736 Observations 58 ANOVA df SS MS F Significance F Regression 1 10.1132736 10.1132736 2.263551 0.138070 Residual 56 250.2012850 4.4678801 Total 57 260.3145586 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper 95.0%

Intercept 2.271997 1.409598 1.611805 0.112627 -0.551767 5.095761 -0.551767 5.0957605 X Variable 1 -0.003659 0.002432 -1.504510 0.138070 -0.008531 0.001213 -0.008531 0.0012129 Refer to Section 3.8.4 of Reference 4.1.3 for Methodology for Regression Analysis.

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Regression - Drift Page 19 of 22 Drift Regression Line Fit Plot 8

6 Drift (V VAC) 4 2 Drift 0 Predicted Drift

-2

-4

-6 300 400 500 600 700 800 Time (Days)

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Regression - AV of Drift Page 20 of 22 Regression Analysis - AV of Drift ABSOLUTE VALUE F Critical REGRESSION ANALYSIS 3.161861

SUMMARY

OUTPUT Regression Statistics Multiple R 0.047250 R Square 0.002233 Adjusted R Square -0.015585 Standard Error 1.369235 Observations 58 ANOVA df SS MS F Significance F Regression 1 0.2349209 0.2349209 0.125304 0.724681 Residual 56 104.9889895 1.8748034 Total 57 105.2239103 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper 95.0%

Intercept 1.963449 0.913108 2.150292 0.035864 0.134274 3.792625 0.134274 3.792625 X Variable 1 -0.000558 0.001575 -0.353983 0.724681 -0.003714 0.002598 -0.003714 0.002598 Refer to Section 3.8.4 of Reference 4.1.3 for Methodology for Regression Analysis.

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Regression - AV of Drift Page 21 of 22 AV of Drift Regression Line Fit Plot 7

6 AV of Driftt (VAC) 5 AV of Drift 4

3 Predicted AV of 2 Drift 1

0 300 400 500 600 700 800 Time (Days)

DRIFT ANALYSIS General Electric NGV13B G13.18.6.3-012 Rev. 0 RIVER BEND STATION Undervoltage Relays Attachment 1 Analyzed Drift (DA) Page 22 of 22 Drift Bias Determination First, the bias term is evaluated for significance per Section 3.10 of Reference 4.1.3.

Per Outlier Statistical Summary, Count (N) 58 Drift Data Points Drift Bias Term (Mean) 0.1928 VAC Standard Deviation (Stdev) 2.1370 VAC t for Count = 58 Data Points 2 (Ref. 4.1.3, Table 4)

[Bias (Crit) = t

  • Stdev / (N)^0.5]

Signficant Bias Critical Value 0.561 VAC Therefore the bias value for this drift data set is not signficant, Therefore, signficant since the magnitude of the Bias is less than the Critical Bias Value Value.

DAbias = Negligible Random Drift Determination Time Dependency Moderate Count (N) 58 Drift Data Points Standard Deviation of FDS (Stdev) 2.1370 VAC Maximum Bin 5 Time Interval 683 Days Maximum Required Cal Interval 915 Days Tolerance Interval Factor (TIF) 2.354 (Ref. 4.1.3, Table 1)

[Current Interval Drift = Stdev

  • TIF]

DArandom (current) = +/- 5.031 VAC

[Extrap Drift = DArandom (current) * (Required Cal Interval / Maximum FDS Cal Interval)1/2]

DArandom (extrap) = +/- 5.823 VAC for up to 915 Days

G13.18.6.3-012 Attachment 2 Page 1 of 8 DESIGN VERIFICATION COVER PAGE ANO-1 ANO-2 IP-2 IP-3 JAF PLP PNPS VY GGNS RBS W3 NP Document No. G13.18.6.3-012 Revision No. Page 1 of 0

Title:

Drift Study for General Electric Model NGV13B Undervoltage Relays Quality Related Augmented Quality Related DV Method: Design Review Alternate Calculation Qualification Testing VERIFICATION REQUIRED DISCIPLINE VERIFICATION COMPLETE AND COMMENTS RESOLVED (DV print, sign, and date)

Electrical Mechanical Richard J. Hannigan Instrument and Control 1-20-09 Civil/Structural Nuclear Originator:

K.R. Melson / / 1-20-09 Print/Sign/Date After Comments Have Been Resolved

G13.18.6.3-012 Attachment 2 Page 2 of 8 DESIGN VERIFICATION CHECKLIST SHEET 1 OF 3 IDENTIFICATION: DISCIPLINE:

Civil/Structural Document

Title:

Drift Study for General Electric Model NGV13B Undervoltage Relays Electrical Doc. No.:G13.18.6.3-012 Rev. 0 QA Cat. 1 I&C Mechanical Richard J. Hannigan 1-20-09 Nuclear Print Sign Date Verifier: Other Manager authorization for supervisor performing Verification.

N/A Print Sign Date METHOD OF VERIFICATION:

Design Review Alternate Calculations Qualification Test The following basic questions are addressed as applicable, during the performance of any design verification. These questions are based on the requirements of ANSI N45.2.11 - 1974.

NOTE The reviewer can use the Comments/Continuation sheet at the end for entering any comment/resolution along with the appropriate question number. Additional items with new question numbers can also be entered.

1. Design Inputs - Were the inputs correctly selected and incorporated into the design?

(Design inputs include design bases, plant operational conditions, performance requirements, regulatory requirements and commitments, codes, standards, field data, etc.

All information used as design inputs should have been reviewed and approved by the responsible design organization, as applicable.

All inputs need to be retrievable or excerpts of documents used should be attached.

See site specific design input procedures for guidance in identifying inputs.)

Yes No N/A

2. Assumptions - Are assumptions necessary to perform the design activity adequately described and reasonable? Where necessary, are assumptions identified for subsequent re-verification when the detailed activities are completed? Are the latest applicable revisions of design documents utilized?

Yes No N/A

3. Quality Assurance - Are the appropriate quality and quality assurance requirements specified?

Yes No N/A

G13.18.6.3-012 Attachment 2 Page 3 of 8 DESIGN VERIFICATION CHECKLIST SHEET 2 OF 3

4. Codes, Standards and Regulatory Requirements - Are the applicable codes, standards and regulatory requirements, including issue and addenda properly identified and are their requirements for design met?

Yes No N/A

5. Construction and Operating Experience - Have applicable construction and operating experience been considered?

Yes No N/A

6. Interfaces - Have the design interface requirements been satisfied and documented?

Yes No N/A

7. Methods - Was an appropriate design or analytical (for calculations) method used?

Yes No N/A

8. Design Outputs - Is the output reasonable compared to the inputs?

Yes No N/A

9. Parts, Equipment and Processes - Are the specified parts, equipment, and processes suitable for the required application?

Yes No N/A

10. Materials Compatibility - Are the specified materials compatible with each other and the design environmental conditions to which the material will be exposed?

Yes No N/A

11. Maintenance requirements - Have adequate maintenance features and requirements been specified?

Yes No N/A

12. Accessibility for Maintenance - Are accessibility and other design provisions adequate for performance of needed maintenance and repair?

Yes No N/A

13. Accessibility for In-service Inspection - Has adequate accessibility been provided to perform the in-service inspection expected to be required during the plant life?

Yes No N/A

14. Radiation Exposure - Has the design properly considered radiation exposure to the public and plant personnel?

Yes No N/A

15. Acceptance Criteria - Are the acceptance criteria incorporated in the design documents sufficient to allow verification that design requirements have been satisfactorily accomplished?

Yes No N/A

16. Test Requirements - Have adequate pre-operational and subsequent periodic test requirements been appropriately specified?

Yes No N/A

G13.18.6.3-012 Attachment 2 Page 4 of 8 DESIGN VERIFICATION CHECKLIST SHEET 3 OF 3

17. Handling, Storage, Cleaning and Shipping - Are adequate handling, storage, cleaning and shipping requirements specified?

Yes No N/A

18. Identification Requirements - Are adequate identification requirements specified?

Yes No N/A

19. Records and Documentation - Are requirements for record preparation, review, approval, retention, etc., adequately specified? Are all documents prepared in a clear legible manner suitable for microfilming and/or other documentation storage method? Have all impacted documents been identified for update as necessary?

Yes No N/A

20. Software Quality Assurance- ENN sites: For a calculation that utilized software applications (e.g., GOTHIC, SYMCORD), was it properly verified and validated in accordance with EN- IT-104 or previous site SQA Program?

ENS sites: This is an EN-IT-104 task. However, per ENS-DC-126, for exempt software, was it verified in the calculation?

Yes No N/A

21. Has adverse impact on peripheral components and systems, outside the boundary of the document being verified, been considered?

Yes No N/A

G13.18.6.3-012 Attachment 2 Page 5 of 8 DESIGN VERIFICATION COMMENT SHEET SHEET 1 OF 1 Comments / Continuation Sheet Question Comments Resolution Initial/Date NONE

G13.18.6.3-012 Attachment 2 Page 6 of 8 During the independent review of calculation G13.18.6.3-012, alternate applications Lotus 1-2-3 and Quattro Pro were used to validate the results generated by MS Excel in the calculation. The reviewer independently generated the G13.18.6.3-012 results. In the table below the results of the validation for the G13.18.6.3-012 values and the values produced by Lotus 1-2-3 and Quattro Pro are illustrated for the Final Data Set after removal of the single outlier. The results from Lotus 1 3 and Quattro Pro validated the calculation G13.18.6.3-012 results generated by MS Excel. Minor differences in the values between the MS Excel generated results and the Lotus 1-2-3 and Quattro Pro generated results were reviewed and can be attributed to rounding and conversion between applications. Below is a partial listing of some of the values from G13.18.6.3-012 that were validated:

G13.18.6.3-012 Validation Validation Parameter Value Value Application Valid?

Mean 0.1928 0.1928 Lotus 1-2-3 Yes Variance 4.5669 4.5669 Lotus 1-2-3 Yes Standard 2.1370 2.1370 Lotus 1-2-3 Yes Deviation Count 58 58 Lotus 1-2-3 Yes Max 6.31 6.31 Lotus 1-2-3 Yes Median 0.05 0.05 Lotus 1-2-3 Yes Min -4.10 -4.10 Lotus 1-2-3 Yes Range 10.41 10.41 Lotus 1-2-3 Yes Sum 11.180 11.180 Lotus 1-2-3 Yes Kurtosis 0.231 0.231 Lotus 1-2-3 Yes Skewness 0.175 0.175 Lotus 1-2-3 Yes Seq. ID 79 identified as Seq. ID 79 identified as Outliers outlier and removed outlier and removed Lotus 1-2-3 Yes Visual inspection Drift scatter plot N/A shows agreement Lotus 1-2-3 Yes with trend line between the scatter plots and trend lines Drift scatter plot trend line Y = -0.0037x + 2.272 Y = -0.00366x + 2.27 Lotus 1-2-3 Yes 123.7 (does not reject 123.7 (does not reject D Test assumption of assumption of Lotus 1-2-3 Yes normality) normality)

Visual inspection Histogram N/A shows agreement Lotus 1-2-3 Yes between the two histograms

G13.18.6.3-012 Attachment 2 Page 7 of 8 G13.18.6.3-012 Validation Validation Parameter Value Value Application Valid?

Data within 0.5 Standard 22 22 Lotus 1-2-3 Yes Deviations Data within 1.0 Standard 41 41 Lotus 1-2-3 Yes Deviation Data within 1.5 Standard 49 49 Lotus 1-2-3 Yes Deviations Data within 2.0 Standard 56 56 Lotus 1-2-3 Yes Deviations Data within 2.5 Standard 57 57 Lotus 1-2-3 Yes Deviations Bin 4 count 12 12 Lotus 1-2-3 Yes Bin 4 drift Standard 1.9670 1.9670 Lotus 1-2-3 Yes Deviation Bin 4 drift mean 1.5467 1.5467 Lotus 1-2-3 Yes Bin 4 interval 361.50 361.50 Lotus 1-2-3 Yes mean Bin 4 interval maximum 393 393 Lotus 1-2-3 Yes Bin 5 count 41 41 Lotus 1-2-3 Yes Bin 5 drift Standard 1.9748 1.9748 Lotus 1-2-3 Yes Deviation Bin 5 drift mean -0.3398 -0.3398 Lotus 1-2-3 Yes Bin 5 interval 612.10 612.10 Lotus 1-2-3 Yes mean Bin 5 interval maximum 683 683 Lotus 1-2-3 Yes Bin 6 count 5 5 Lotus 1-2-3 Yes Bin 6drift Standard 2.3400 2.3400 Lotus 1-2-3 Yes Deviation Bin 6 drift mean 1.3100 1.3100 Lotus 1-2-3 Yes Bin 6 interval 705.00 705.00 Lotus 1-2-3 Yes mean Bin 6 interval maximum 705 705 Lotus 1-2-3 Yes Binning Analysis Ratio of 1.008 1.008 Lotus 1-2-3 Yes Variances Binning Analysis 2.531 2.531 Quattro Pro Yes F Critical

G13.18.6.3-012 Attachment 2 Page 8 of 8 G13.18.6.3-012 Validation Validation Parameter Value Value Application Valid?

Visual inspection Drift Regression NA shows agreement Lotus 1-2-3 Yes Scatter Plot between the two scatter plots and trend lines.

Drift Regression Scatter Plot Trend Y = -0.003659x Y = -0.003659x Quattro Pro Yes Line +2.271997 +2.271997 Drift Regression R Square Value 0.038850 0.038850 Quattro Pro Yes Drift Regression Quattro Pro Yes F Value 2.263551 2.263551 F Crit Value 3.161861 3.161861 Quattro Pro Yes Drift Regression P-Value 0.138070 0.137971 Quattro Pro Yes Visual inspection AV Drift Regression NA shows agreement Lotus 1-2-3 Yes Scatter Plot between the two scatter plots and trend lines.

AV Drift Regression Y = -0.000558x Y = -0.0005577x Scatter Plot Trend +1.963449 +1.963449 Quattro Pro Yes Line AV Drift Regression R Square Value 0.002233 0.002233 Quattro Pro Yes AV Drift Regression F Value 0.125304 0.125304 Quattro Pro Yes F Crit Value 3.161861 3.161861 Quattro Pro Yes AV Drift Regression P-Value 0.724681 0.724657 Quattro Pro Yes Other values, including those based on the above parameters, were checked using hand calculations.

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