RS-08-026, Response to NRC Request for Additional Information Concerning Request for License Amendment to Revise Turbine Condenser Vacuum - Low Scram Instrumentation Function

Response to NRC Request for Additional Information Concerning Request for License Amendment to Revise Turbine Condenser Vacuum - Low Scram Instrumentation Function

ML080570574
Person / Time
Site:	Dresden, Quad Cities
Issue date:	02/26/2008
From:	Hansen J Exelon Generation Co, Exelon Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RS-08-026, TAC MD6250, TAC MD6251, TAC MD6252, TAC MD6253
Download: ML080570574 (20)

Text

Exelon Generation WWW.eXelOncorp.COM 4300 Winfield Road Warrenville, I L 60555 RS-08-026 February 26, 2008 U. S. Nuclear Regulatory Commission ATTN : Document Control Desk Washington, DC 20555-0001 Dresden Nuclear Power Station, Units 2 and 3 Renewed Facility Operating License Nos. DPR-19 and DPR-25 NRC Docket Nos. 50-237 and 50-249 Quad Cities Nuclear Power Station, Units 1 and 2 Renewed Facility Operating License Nos. DPR-29 and DPR-30 NRC Docket Nos. 50-254 and 50-265 Exelon..

Nuclear 10 CFR 50.90

Subject:

Response to NRC Request for Additional Information Concerning Request for License Amendment to Revise Turbine Condenser Vacuum - Low Scram Instrumentation Function References :

1.

Letter from P. R. Simpson (Exelon Generation Company, LLC) to U.S.

NRC, "Request for License Amendment to Revise Turbine Condenser Vacuum - Low Scram Instrumentation Function," dated August 1, 2007

2. Letter from J. S. Wiebe (U. S. NRC) to C. G. Pardee (Exelon Generation Company, LLC), "Dresden Nuclear Power Station, Units 2 and 3, and Quad Cities Nuclear Power Station, Units 1 and 2 - Request for Additional Information Related to Turbine Condenser Vacuum - Low Scram Setpoint Change (TAC Nos. MD6250, MD6251, MD6252 and MD6253)," dated January 30, 2008 In Reference 1, Exelon Generation Company, LLC (EGC) submitted a request to amend Appendix A, Technical Specifications (TS) for Facility Operating License Nos. DPR-19, DPR-25, DPR-29, and DPR-30 for Dresden Nuclear Power Station (DNPS), Units 2 and 3, and Quad Cities Nuclear Power Station (QCNPS), Units 1 and 2, respectively.

The proposed amendment would revise the DNPS and QCNPS TS Allowable Value for the Reactor Protection System Instrumentation Function 10, "Turbine Condenser Vacuum -

Low," specified in TS Table 3.3.1.1-1, "Reactor Protection System Instrumentation." The proposed amendment would also revise the Channel Functional Test and Channel Calibration Surveillance Test Interval (STI) for DNPS TS Table 3.3.1.1-1, Function 10. As part of the DNPS STI revision, TS Surveillance Requirement 3.3.1.10, "Channel Calibration,"

which is specific to the Turbine Condenser Vacuum - Low instrument function, is deleted since it is no longer applicable.

February 26, 2008 U. S. Nuclear Regulatory Commission Page 2 In Reference 2, the NRC provided a request for additional information (RAI) related to the proposed license amendment. This RAI referenced draft questions that were provided to EGC in an email from J. S. Wiebe to J. L. Schrage on December 4, 2007. In response to this request, EGC is providing the information in the Attachment and Enclosure to this letter.

There are no regulatory commitments contained within this letter.

If you have any questions concerning this letter, please contact Mr. John L. Schrage at (630) 657-2821.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 26th day of February 2008.

Jeff rey6L. Hansen Manager - Licensing Attachment : EGC Response to Request for Additional Information, License Amendment Request, Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function Enclosure :

Historical Channel Calibration Results, Turbine Condenser Vacuum - Low Vacuum Switches, Dresden Nuclear Power Station, Units 2 and 3

Attachment EGC Response to Request for Additional Information License Amendment Request Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function NRC RAI Question 1.a :

Setpoint Calculation Methodology Provide documentation (including sample calculation) of the methodology used for establishing the limiting setpoint (or NSP) and the limiting acceptable values for the As-Found and As-Left setpoints as measured in periodic surveillance testing. Indicate the related Analytical Limits and other limiting design values (and the sources of these values) for each setpoint. If the setpoint methodology has already been approved by the NRC then please provide the appropriate references with dates.

Application Section 4.1, third paragraph The EGC setpoint methodology that was used for determining the revised AV is described in Reference 10. This setpoint methodology is consistent with ISA RP 67.04.02 - 2000, Method 3 (Reference 11). The NRC reviewed and approved the use of this setpoint methodology by EGC to determine AVs in Reference 12.

Clarification Reauested The submittal did not identify any date for Reference 10 for the setpoint methodology.

Rev. 2 of the calculation was found in our records systems (ML003721342). Is Rev. 2 the revision that was approved by the NRC? Is Rev. 2 the latest revision? Provide a more specific description of reference 12 such as the ADAMS record number, NRC TAC number, or plant and amendment number. Several letters were issued by NRC to Dresden and Quad Cities on the same day as reference 12 date (March 30, 2001).

Provide excerpts from the calculation for staff review. The excerpts should include LSSS, Allowable Value or Limiting Setpoint Value, setting tolerance, nominal setpoint, allowable deviation, and the limiting acceptable values for the As-Found and As-Left setpoints as measured in periodic surveillance testing. Even though the RIS 2006-17 was referenced in the application, the handling of As-Found and As-Left data is not clear.

Exelon Generation Company, LLC (EGC) Response :

In letters dated March 30, 2001, the NRC issued license amendments and associated Safety Evaluations (SEs) for DNPS (ADAMS Accession Number ML011130121) and QCNPS (ADAMS Accession Number ML011130309). These SEs document the NBC's review of Revision 3 to NES-EIC-20.04, "Analysis of Instrument Channel Setpoint Error and Instrument Loop Accuracy." As stated in these SEs, EGC provided Revision 3 of NES-EIC-20.04 to the NRC, and documented the provision of this revision in a letter dated November 30, 2000 (ADAMS Accession Number ML003776648). The March 30, 2001 NRC SEs concluded that, "The staff also finds that the instrument setpoint methodology used by the licensee to determine the allowable values is acceptable."

Subsequent to the March 30, 2001 SEs and license amendments, EGC issued Revision 4 to NES-EIC-20.04. The scope of the change in Revision 4 is limited. For example, Revision 4 corrected a typo to a table in Appendix J, "Guideline for the Analysis and Use of As-Found/As-Left Data," added clarification to Appendix J, Sections 2.1.1 and 2.1.2.2, and incorporated the changing of the company name from "ComEd" to Page 1 of 10

Attachment EGC Response to Request for Additional Information License Amendment Request Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function "Exelon." The calculational methodology that was used for the current license amendment request (i.e., Revision 4 of NES-EIC-20.04) is the same as that reviewed by the NRC in 2001 (i.e., Revision 3 of NES-EIC-20.04). The following tables provide the requested data from the setpoint calculations that support the current license amendment request (LAR).

Table 1 DNPS Calibration Setpoint / Allowable Value Table 2 DNPS Calibration Frequency, Setting Tolerances and Expanded Tolerances For DNPS, at the end of a periodic calibration, As-Left values can range from 21.4" Hg to 21.8" Hg (i.e., 21.6" +/- 0.2" Hg). As-Found values can range from 21.0" Hg to 22.2" Hg (i.e., 21.6" f 0.6" Hg).

Table 3 QCNPS Calibration Setpoint / Allowable Value Page 2 of 10 EPN Parameter Process Units PS-1 (2)-0503-A thru D Design Limit [i.e., the Assumed Analytical Limit AL 20" Hg vacuum Allowable Value (AV)

>_ 20.6" H vacuum Calibration Setpoint 21.1 " Hg vacuum EPN Parameter Process Units PS-2(3)-0503-A thru D Design Limit [i.e., the Assumed Analytical Limit AL 20" Hg vacuum Allowable Value (AV)

>_ 20.5" H vacuum Calibration Setpoint 21.6" Hg vacuum Surveillance Setting Tolerance Expanded Tolerance Interval (As-Left value)

(As-Found value) 3a (2(y)

Channel Calibration and Quarterly

+/- 0.2" Hg vacuum

+/- 0.6" Hg vacuum Functional Test

Attachment EGC Response to Request for Additional Information License Amendment Request Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function Table 4 QCNPS Calibration Frequency, Setting Tolerances and Expanded Tolerances For QCNPS, at the end of a periodic calibration, As-Left values can range from 20.8" Hg to 21.4" Hg (i.e., 21.1"+/-0.3" Hg). As-Found values can range from 20.7" Hg to 21.5" Hg (i.e., 21.1" t 0.4" Hg).

The values determined for DNPS and QCNPS, while similar, differ because the two stations use vacuum switches from different manufacturers and therefore are of different makes and models.

NRC RAI Question 1.b :

Safety Limit (SL)-Related Determination: Provide a statement as to whether or not the setpoint is a limiting safety system setting (LSSS) for a variable on which a safety limit (SL) has been placed as discussed in 10 CFR 50.36(c)(1)(ii)(A).

Application Section 3.1.2, second paragraph The turbine stop valve closure scram function alone is capable of preventing the fuel cladding integrity Safety Limit from being exceeded, in the event of the most limiting transient (i.e., a turbine trip without bypass). The condenser low vacuum scram is anticipatory to the stop valve closure scram.

Clarification Requested Explain the following statement from page 9 of Attachment 1 of the application:

"The Turbine Condenser Vacuum-Low scram function does not protect a Safety Limit."

EGC Response :

The Turbine Condenser Vacuum - Low scram function (i.e., Technical Specification 3.3.1.1, "RPS Instrumentation," Table 3.3.1.1-1, RPS Function 10) provides a reactor scram signal on decreasing vacuum. This scram function actuates prior to the turbine trip function, which actuates the Turbine Stop Valve Closure scram function. Therefore, the Turbine Condenser Vacuum - Low scram signal anticipates the Turbine Stop Valve Closure scram (i.e., TS 3.3.1.1, Table 3.3.1.1-1, RPS Function 8, "Turbine Stop Valve Closure"), thereby reducing the reactor pressure transient, neutron flux increase, and the fuel surface heat flux, all of which occur when the condenser is isolated from the reactor.

The Allowable Value (AV) for the Turbine Condenser Vacuum - Low scram function was originally selected to mitigate a loss of main condenser vacuum event by anticipating the transient and scramming the reactor at a higher, more conservative vacuum level than the reactor trip associated with turbine stop valve closure.

Page 3 of 10 Surveillance Setting Tolerance Expanded Tolerance Interval (As-Left value)

(As-Found value)

(3(y)

(2a)

Channel Calibration and Quarterly

+/- 0.3" Hg vacuum

+/- 0.4" Hg vacuum Functional Test

Attachment EGC Response to Request for Additional Information License Amendment Request Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function The Turbine Stop Valve Closure scram function is the scram signal for turbine trip events that is credited in transient analyses. The reactor scram reduces the amount of energy required to be absorbed and ensures that the Minimum Critical Power Ratio (MCPR) SL is protected. The plant operating conditions and assumptions are nearly identical to those of the generator load rejection transient, both with and without bypass capoability. These two events are among the limiting transients that are analyzed each operating cycle. The cycle-specific transient analysis includes the determination of the fuel-specific operating limit MCPR (OLMCPR). The OLMCPR establishes the necessary operational margin to protect the SLMCPR (i.e., the fuel cladding integrity SL), during operation.

Since the Turbine Condenser Vacuum - Low scram function only serves as an anticipatory design feature signal to the turbine trip signal, the Turbine Condenser Vacuum - Low scram function does not directly protect an SL. Therefore, the Turbine Condenser Vacuum - Low scram function does not serve as an SL-Limiting Safety System Setting (LSSS).

NRC RAI Question 1.c :

Only applicable to SL-Related setpoints.

Clarification Reauested None if it is not SL-Related.

EGC Response :

Since the Turbine Condenser Vacuum - Low scram function does not directly protect an SL, it is not a SL-Limiting Safety System Setting (LSSS).

NRC RAI Question 1.d :

For Setpoint that is not determined to be SL-Related : Describe the measures to be taken to ensure that the associated instrument channel is capable of performing its specified safety functions in accordance with applicable design requirements and associated analyses. Include in your discussion information on the controls you employ to ensure that the As-Left trip setting after completion of periodic surveillance is consistent with your setpoint methodology. Also, discuss the plant corrective action processes (including plant procedures) for restoring channels to operable status when channels are determined to be "inoperable" or "operable but degraded." If the controls are located in a document other than the TS (e.g., plant test procedure), describe how it is ensured that the controls will be implemented.

Application Section 3.1.3 See entire section.

Page 4 of 10

Attachment EGC Response to Request for Additional Information License Amendment Request Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function Clarification Requested Section 3.1.3 does not answer the specific items in question 1.d.

Describe the controls you employ to ensure that the As-Left trip setting after completion of periodic surveillance is consistent with your setpoint methodology. Also, discuss the plant corrective action processes (including plant procedures) for restoring channels to operable status when channels are determined to be 'inoperable" or "operable but degraded." If the controls are located in a document other than the TS (e.g., plant test procedure), describe how it is ensured that the controls will be implemented. These specific items are not addressed in the setpoint methodology, NES-EIC-20.04.

EGC Response:

The EGC administrative controls that ensure consistency of As-Left instrument values with the setpoint methodology (i.e., NES-EIC-20.04) are contained in a series of Engineering and Corrective Action Program (CAP) procedures.

Engineering procedure ER-AA-520, "Instrument Performance Trending," defines the administrative process to implement an instrument trending program in order to monitor the behavior of instrumentation, thus providing an early warning of failure. The ER-AA-520 procedure works with additional EGC Engineering procedures (i.e., ER-AA-2030, Conduct of Plant Engineering," ER-AA-2002, "System Health Indicator Program," and ER-AA-2003, "System Performance Monitoring and Trending"), and the EGC CAP procedures (i.e., LS-AA-120, "Issue Identification and Screening Process," and LS-AA-125, "Corrective Action Program (CAP) Procedure") to form a program that provides both timely and in-depth monitoring of surveillance results.

These procedures ensure that the results of instrument calibrations are monitored and periodic reviews of calibration data are conducted to determine instrument performance, relative to expectations. As such, the instrument trending program also provides control of the As-Found/As-Left data analysis program at DNPS and QCNPS.

ER-AA-520 also establishes the required actions when an As-Found instrument setpoint exceeds the AV, as well as when an As-Found setpoint is within the AV, but exceeds the Expanded Tolerance (ET) :

If an As-Found instrument setpoint exceeds the AV, the instrument technician will enter the condition into the CAP by initiating a Condition Report (CR), and will notify the operating Shift Manager that the instrument is potentially inoperable. The operating Shift Manager (SM) will utilize LS-AA-120 to initially screen the condition, including the determination of operability. The SM will also initiate a Work Request (WR) to evaluate and repair/replace the instrument, prior to resetting the instrument to within a setting tolerance (ST).

If an As-Found instrument setpoint is within the AV, but exceeds the ET, the instrument technician will reset the instrument to within the ST, and enter the condition into the CAP program by initiating a CR and notifying the operating SM that the instrument is out-of-tolerance (OOT).

Page 5 of 10

Attachment EGC Response to Request for Additional Information License Amendment Request Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function If an instrument cannot be reset to within the ST during calibration, then the instrument technician will initiate a CR to document the information and the instrument will be repaired/replaced.

NRC RAI Question 2:

In the January 11, 2000, letter from J. M. Heffley (Commonwealth Edison Company) to USNRC regarding "Proposed Technical Specifications Change, Surveillance Test Intervals and Allowable Outage Times for Protective Instrumentation" for DNPS Units 2 and 3, the licensee requested to change the Channel Calibration surveillance requirement for Turbine Condenser Vacuum - Low in Table 4.1A-1 from quarterly to monthly with the explanation, "We are not proposing to relax the CHANNEL FUNCTIONAL TEST surveillance interval for the condenser low vacuum scram instruments. As part of our corrective action plan, we have proposed to conservatively increase the CHANNEL CALIBRATION frequency from the current technical specification frequency of quarterly to monthly." This change was approved in August 2, 2000, letter from USNRC to O. D. Kingsley of Commonwealth Edison Company. The current submittal requests that the same Channel Calibration surveillance requirement test be changed from monthly to 92 days. To assess the acceptability of this change please respond to the following two items :

i)

What was the corrective action plan for DNPS Units 2 and 3 for this test and how has it been resolved?

ii)

Provide the quarterly drift data and confirm that the drift data used for these pressure switches supports the drift value used in the calculation.

Application Section 3.2.2 The DNPS CC STI for the Turbine Condenser Vacuum - Low scram instrumentation was revised from quarterly (i.e., once every 92 days) to the current value as part of License Amendments 177 and 173 to Facility Operating Licenses DPR-19 and DPR-25, respectively (References 5 and 6) to reflect the administrative controls for the SR at that time.

Subsequent to the issuance of Amendments 177 and 173, EGC performed a revised setpoint error analysis that established a revised AV, trip setpoint, and Expanded Tolerance (ET) for the DNPS Turbine Condenser Vacuum - Low scram instrument, which resulted in additional design margin between the AV and the trip setpoint. This increased design margin, combined with historical CC data, provides adequate assurance that the component will remain operable during the previously approved CC quarterly STI.

Clarification Requested Provide a response to the two specific questions which are restated below:

i)

What was the corrective action plan for DNPS Units 2 and 3 for this test and how has it been resolved?

ii)

Provide the quarterly drift data and confirm that the drift data used for these pressure switches supports the drift value used in the calculation.

Page 6 of 10

Attachment EGC Response to Request for Additional Information License Amendment Request Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function EGC Response:

i)

In Attachment A of the January 11, 2000 license amendment request (i.e.,

ADAMS Accession Number ML003676022), ComEd (i.e., the licensee prior to EGC) stated : "The CHANNEL CALIBRATION [CC] frequency for Function Unit 12 [i.e., the Turbine Condenser Vacuum - Low function] has been revised to monthly to reflect the current station practices."

Prior to the submittal of that license amendment request, repetitive failures of the quarterly channel calibration for the instrument necessitated an administrative reduction in the calibration frequency, which was formalized in Amendments 177 and 173 to DPR-19 and DPR-25, respectively (i.e., DNPS Units 2 and 3). The "action plan" described in the LAR refers to the actions that were taken to reduce the repetitive failures, which consisted of the administrative STI reduction.

Subsequent to the issuance of the license amendment by the NRC, EGC completed a revision to the setpoint error analysis for the instrument. This revised setpoint error analysis utilized a new design limit and resulted in a new AV, trip setpoint, and ET. The new AV, trip setpoint, and ET established increased design margin between the trip setpoint and the AV. This increased design margin and the associated assumption for instrument drift between successive calibrations, combined with historical CC data, provided adequate assurance that the instrument would remain operable throughout the previously approved CC frequency (i.e., quarterly).

ii.

EGC has reviewed approximately 400 historical CC data sets at DNPS from January 2004 to the present for the Turbine Condenser Vacuum - Low RPS instrument with respect to Technical Specification compliance. A comparison of these historical data sets to the current and the proposed AV, the latter of which was established to a 95%/95% confidence level, indicates that all data sets are within both the current and the revised AV. A sample of this data (i.e., from January 2006 to the present) is provided in the Enclosure to this letter. The setpoint error analysis that was used to support the proposed AV includes an allowance for the drift associated with the longer surveillance test interval.

Page 7 of 10

Attachment EGC Response to Request for Additional Information License Amendment Request Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function NRC RAI Question 3:

How was the new value for the Turbine Condenser Vacuum - Low determined? Was a new transient analysis performed?

Application Section 4.1 In that the proposed reduction of the Turbine Condenser Vacuum - Low AV is based upon an AL that is equal to the nominal trip setpoint for the turbine trip, the resulting nominal trip setpoint for the Turbine Condenser Vacuum - Low scram will still be more conservative than the turbine trip setpoint. Therefore, the sequence of events for the loss of main condenser AOO will still result in a reactor scram prior to the turbine trip.

Since the proposed change to the Turbine Condenser Vacuum - Low AV will not impact the limiting AOO analysis (i.e., the turbine trip with bypass failure event), the proposed change does not reduce any margin of safety.

Clarification Requested Explain the rational for basing the Turbine Condenser Vacuum - Low AV on an AL that is equal to the nominal trip setpoint for the turbine trip. Clarify whether or not a new transient analysis was performed with the new value for the Turbine Condenser Vacuum - Low.

EGC Response :

The value used to determine the proposed AV is based upon an EGC review of the Turbine Condenser Vacuum - Low scram function, with concurrence from the nuclear steam supply system (NSSS) and turbine supplier. This review concluded that the design limit for the function could be lowered to coincide with the calibration setpoint (i.e., the nominal trip setpoint) for the turbine trip, which occurs at 20" Hg.

As described in the response to NRC Request 1.b, the Turbine Condenser Vacuum -

Low scram function is not an SL-LSSS; therefore, this design limit is not strictly an AL, as defined in NES-EIC-20.04. However, in establishing AVs, ETs, and STs for non-SL-LSSSs, EGC treats these design limits as traditional ALs when applying the calculational methodologies of NES-EIC-20.04.

The Turbine Condenser Vacuum - Low scram function is credited in the Loss of Main Condenser Vacuum anticipated operational occurrence (AOO). The loss of main condenser AOO event assumes that the main condenser is instantaneously lost while the unit is operating at full power. This is classified as a moderate frequency event and is described in the UFSAR as being bounded by the Turbine Trip Without Bypass event.

As vacuum decreases, the sequence of events is as follows:

o The Condenser Low Vacuum alarm setpoint is reached. This occurs at a vacuum level of 24" Hg.

Page 8 of 10

Attachment EGC Response to Request for Additional Information License Amendment Request Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function o

The Condenser Vacuum Low alarm setpoint is reached. This occurs at a vacuum level of 23.5" Hg.

a The Turbine Condenser Vacuum - Low scram setpoint is reached. Based upon the proposed AV and application of the EGC setpoint methodology, this will occur at a calibration setpoint of 21.6" Hg at DNPS and 21.1" Hg for QCNPS.

o The AV for the Turbine Condenser Vacuum - Low scram (i.e., 20.5" Hg for DNPS and 20.6" Hg for QCNPS) is reached.

o The turbine trip setpoint is reached, which results in the Turbine Stop Valve - Closure scram. This occurs at a vacuum level of 20" Hg.

o The turbine bypass valve closure setpoint is reached. This occurs at a vacuum level of 7" Hg.

The loss of main condenser transient (i.e., the transient associated with the Turbine Condenser Vacuum - Low scram) is not analyzed for reload cores since it is not a limiting transient, as it is bounded by the Turbine Trip Without Bypass transient event.

Since the proposed AV for the Turbine Condenser Vacuum - Low scram function does not impact the limiting transient event, EGC did not perform a new transient analysis.

Page 9 of 10

Attachment EGC Response to Request for Additional Information License Amendment Request Revise the Turbine Condenser Vacuum - Low Scram Instrumentation Function NRC RAI Question 4:

The acronym AL is not defined in the application. Provide the definition on the docket.

EGC Response :

Analytical Limit (AL) is defined in NES-EIC-20.04 as the limit of a measured or calculated variable established by the safety analysis to ensure that a safety limit is not exceeded.

However, as noted in the EGC Response to NRC Questions 1.b and 3, the Turbine Condenser Vacuum - Low scram function is a plant design feature that does not protect an SL and does not have an associated transient analysis. Therefore, the traditional definition of AL is not applicable to the proposed AV. The design limit of 20" Hg that was used to determine a new AV is not based upon a specific transient analysis, and therefore is not strictly an AL. The value of 20" Hg is treated as if it were a traditional analytical limit for the purposes of calculating an AV, in accordance with the same NES-EIC-20.04.

Page 1 0 of 10

Enclosure Historical Channel Calibration Results Turbine Condenser Vacuum - Low Vacuum Switches Dresden Nuclear Power Station, Units 2 and 3 Vacuum Switch Number 2-0503A Work Order Date As-Found Exceeded As-Left

_Drift Amount Number Administrative TS AV?

[As-Found Adjusted 21.92 to 22.48

? 21.4 22.00 to 22.40 - As-Left]

(inches Hg)

(inches Hg)

(inches Hg) inches H inches H 01091416-01 1/16/2008 22.20 No 22.20 0.04 0.00 01083644-01 12/20/2007 21.76 No 22.16

-0.47 0.40 01071843-01 11/20/2007 22.42 No 22.23 0.18

-0.19 01065054-01 10/17/2007 22.65 No 22.24 0.45

-0.41 01054986-01 9/21/2007 21.79 No 22.20

-0.33 0.41 01046870-01 8/17/2007 22.52 No 22.12 0.24

-0.40 0 1040394-01 7/16/2007 22.28 No 22.28 0.27 0.00 01029571-01 6/20/2007 22.01 No 22.01

-0.02 0.00 01020655-01 5/15/2007 22.03 No 22.03

-0.37 0.00 01012980-01 4/16/2007 22.40 No 22.40 0.32 0.00 01000489-01 3/22/2007 22.08 No 22.08

-0.17 0.00 00993888-01 2/12/2007 21.95 No 22.25

-0.29 0.30 00985584-01 1/19/2007 21.85 No 22.24

-0.15 0.39 00975609-01 12/18/2006 22.00 No 22.00

-0.29 0.00 00966959-01 11/13/2006 22.29 No 22.29

-0.03 0.00 00956549-01 10/17/2006 22.32 No 22.32

-0.08 0.00 00946318-01 9/18/2006 22.40 No 22.40 0.14 0.00 00939178-01 8/14/2006 22.64 No 22.26 0.31

-0.38 00931701-01 7/17/2006 22.33 No 22.33 0.23 0.00 00923120-01 6/19/2006 22.10 No 22.10

-0.26 0.00 00913351-01 5/18/2006 22.36 No 22.36 0.13 0.00 00903458-01 4/17/2006 22.23 No 22.23 0.13 0.00 00892151-01 3/20/2006 22.10 No 22.10

-0.20 0.00 00884949-01 2/13/2006 21.92 No 22.30

-0.08 0.38 00877336-01 1/18/2006 22.00 No 22.00 N/A 0.00

Enclosure Historical Channel Calibration Results Turbine Condenser Vacuum - Low Vacuum Switches Dresden Nuclear Power Station, Units 2 and 3 i

Vacuum Switch Number 2-0503B Work Order Date As-Found Exceeded As-Left

_Drift Amount Number Administrative Tech Spec AV?

[As-Found Adjusted 21.92 to 22.48

>_ 21.4 22.00 to 22.40 - As-Left]

(inches Hg)

(inches Hg)

(inches Hg) inches H inches H 01091416-01 1/16/2008 22.13 No 22.13

-0.02 0.00 01083644-01 12/20/2007 21.87 No 22.15

-0.30 0.28 01071843-01 11/20/2007 21.94 No 22.17

-0.28 0.23 01065054-01 10/17/2007 22.54 No 22.22 0.41

-0.32 01054986-01 9/21/2007 22.13 No 22.13

-0.23 0.00 01046870-01 8/17/2007 22.36 No 22.36 0.18 0.00 01040394-01 7/16/2007 22.44 No 22.18 0.33

-0.26 01029571-01 6/20/2007 22.11 No 22.11

-0.16 0.00 01020655-01 5/15/2007 21.72 No 22.27

-0.41 0.55 01012980-01 4/16/2007 22.57 No 22.13 0.37

-0.44 01000489-01 3/22/2007 21.65 No 22.20

-0.38 0.55 00993888-01 2/12/2007 22.03 No 22.03

-0.14 0.00 00985584-01 1/19/2007 22.17 No 22.17 0.00 0.00 00975609-01 12/18/2006 21.72 No 22.17

-0.40 0.45 00966959-01 11/13/2006 22.12 No 22.12

-0.07 0.00 00956549-01 10/17/2006 22.19 No 22.19 0.11 0.00 00946318-01 9/18/2006 22.43 No 22.08 0.17

-0.35 00939178-01 8/14/2006 22.70 No 22.26 0.34

-0.44 00931701-01 7/17/2006 22.36 No 22.36 0.12 0.00 00923120-01 6/19/2006 21.88 No 22.24

-0.28 0.36 00913351-01 5/18/2006 22.16 No 22.16 0.15 0.00 00903458-01 4/17/2006 22.01 No 22.01

-0.06 0.00 00892151-01 3/20/2006 22.07 No 22.07

-0.19 0.00 00884949-01 2/13/2006 21.98 No 22.26

-0.20 0.28 00877336-01 1/18/2006 21.94 No 22.18 N/A 0.24

Enclosure Historical Channel Calibration Results Turbine Condenser Vacuum - Low Vacuum Switches Dresden Nuclear Power Station, Units 2 and 3 Vacuum Switch Number 2-0503C Work Order Date As-Found Exceeded As-Left Drift Amount Number Administrative Tech Spec AV?

[As-Found Adjusted 21.92 to 22.48

>_ 21.4 22.00 to 22.40 - As-Left]

(inches Hg)

(inches Hg)

(inches Hg) inches H inches H 01091416-01 1/16/2008 22.20 No 22.20

-0.05 0.00 01083644-01 12/20/2007 21.91 No 22.25

-0.23 0.34 01071843-01 11/20/2007 21.92 No 22.14

-0.22 0.22 01065054-01 10/17/2007 22.68 No 22.14 0.46

-0.54 01054986-01 9/21/2007 21.77 No 22.22

-0.41 0.45 01046870-01 8/17/2007 22.51 No 22.18 0.18

-0.33 01040394-01 7/16/2007 22.33 No 22.33 0.20 0.00 01029571-01 6/20/2007 22.13 No 22.13

-0.07 0.00 01020655-01 5/15/2007 21.69 No 22.20

-0.43 0.51 01012980-01 4/16/2007 22.49 No 22.12 0.32

-0.37 01000489-01 3/22/2007 21.73 No 22.17

-0.33 0.44 00993888-01 2/12/2007 22.06 No 22.06

-0.15 0.00 00985584-01 1/19/2007 22.21 No 22.21

-0.03 0.00 00975609-01 12/18/2006 21.89 No 22.24

-0.35 0.35 00966959-01 11/13/2006 22.24 No 22.24

-0.05 0.00 00956549-01 10/17/2006 22.29 No 22.29 0.14 0.00 00946318-01 9/18/2006 22.52 No 22.15 0.19

-0.37 00939178-01 8/14/2006 22.33 No 22.33 0.31 0.00 00931701-01 7/17/2006 22.02 No 22.02

-0.16 0.00 00923120-01 6/19/2006 21.96 No 22.18

-0.35 0.22 00913351-01 5/18/2006 22.31 No 22.31 0.15 0.00 00903458-01 4/17/2006 22.16 No 22.16 0.02 0.00 00892151-01 3/20/2006 21.77 No 22.14

-0.25 0.37 00884949-01 2/13/2006 22.02 No 22.02

-0.13 0.00 00877336-01 1/18/2006 21.65 No 22.15 N/A 0.50

Enclosure Historical Channel Calibration Results Turbine Condenser Vacuum - Low Vacuum Switches Dresden Nuclear Power Station, Units 2 and 3 Vacuum Switch Number 2-0503D Work Order Date As-Found Exceeded As-Left Drift Amount Number Administrative Tech Spec AV?

[As-Found Adjusted 21.92 to 22.48

>_ 21.4 22.00 to 22.40 - As-Left]

(inches Hg)

(inches Hg)

(inches Hg) inches H inches H 01091416-01 1/16/2008 22.16 No 22.16

-0.11 0.00 01083644-01 12/20/2007 21.91 No 22.27

-0.23 0.36 01071843-01 11/20/2007 22.14 No 22.14

-0.05 0.00 01065054-01 10/17/2007 22.54 No 22.19 0.45

-0.35 01054986-01 9/21/2007 21.93 No 22.09

-0.36 0.16 01046870-01 8/17/2007 22.59 No 22.29 0.21

-0.30 01040394-01 7/16/2007 22.38 No 22.38 0.26 0.00 01029571-01 6/20/2007 22.12 No 22.12

-0.15 0.00 01020655-01 5/15/2007 21.77 No 22.27

-0.40 0.50 01012980-01 4/16/2007 22.45 No 22.17 0.32

-0.28 01000489-01 3/22/2007 21.86 No 22.13

-0.29 0.27 00993888-01 2/12/2007 21.92 No 22.15

-0.14 0.23 00985584-01 1/19/2007 22.06 No 22.06

-0.02 0.00 00975609-01 12/18/2006 22.08 No 22.08

-0.21 0.00 00966959-01 11/13/2006 22.29 No 22.29

-0.09 0.00 00956549-01 10/17/2006 22.38 No 22.38 0.12 0.00 00946318-01 9/18/2006 22.26 No 22.26 0.12 0.00 00939178-01 8/14/2006 22.61 No 22.14 0.29

-0.47 00931701-01 7/17/2006 22.32 No 22.32 0.16 0.00 00923120-01 6/19/2006 21.89 No 22.16

-0.29 0.27 00913351-01 5/18/2006 22.50 No 22.18 0.14

-0.32 00903458-01 4/17/2006 22.36 No 22.36 0.03 0.00 00892151-01 3/20/2006 21.94 No 22.33

-0.24 0.39 00884949-01 2/13/2006 22.18 No 22.18

-0.03 0.00 00877336-01 1/18/2006 21.85 No 22.21 N/A 0.36

Enclosure Historical Channel Calibration Results Turbine Condenser Vacuum - Low Vacuum Switches Dresden Nuclear Power Station, Units 2 and 3 Vacuum Switch Number 3-0503A Work Order Date As-Found Exceeded As-Left Drift Amount Number Adm inistrative Tech Spec AV?

[As-Found Adjusted 21.92 to 22.48

? 21.4 22.00 to 22.40

- As-Left]

(inches Hg)

(inches Hg)

(inches Hg) inches H inches H 01091419-01 1/16/2008 22.17 No 22.17 0.09 0.00 01083638-01 12/20/2007 22.08 No 22.08

-0.13 0.00 01071838-01 11/20/2007 22.21 No 22.21

-0.01 0.00 01065048-01 10/17/2007 22.50 No 22.22 0.46

-0.28 01054984-01 9/21/2007 22.04 No 22.04

-0.34 0.00 01046869-01 8/17/2007 22.38 No 22.38 0.10 0.00 01040393-01 7/16/2007 22.28 No 22.28 0.21 0.00 01029570-01 6/20/2007 22.07 No 22.07

-0.15 0.00 01021437-01 5/15/2007 21.88 No 22.22

-0.38 0.34 01011878-01 4/17/2007 23.24 No 22.26 0.95

-0.98 01000509-01 3/19/20_07 21.45 No 22.29

-0.63 0.84 00994576-01 2/_12/2007 22.08 No 22.08

-0.12 0.00 00985595-01 1/19/2007 22.20 No 22.20 0.04 0.00 00979186-01 12/18/2006 21.93 No 22.16

-0.23 0.23 00966960-01 11/23/2006 22.16 No 22.16 0.01 0.00 00956548-01 10/17/2006 22.71 No 22.15 0.33

-0.56 00946312-01 9/18/2006 22.38 No 22.38 0.05 0.00 00939177-01 8/14/2006 22.65 No 22.33 0.35

-0.32 00931702-01 7/17/2006 22.30 No 22.30 0.05 0.00 00923119-01 6/19/2006 21.69 No 22.25

-0.45 0.56 00913347-01 5/18/2006 22.14 No 22.14 0.11 0.00 00903462-01 4/17/2006 22.03 No 22.03 0.00 0.00 00892150-01 3/20/2006 22.03 No 22.03

-0.11 0.00 00886955-01 2/13/2006 22.14 No 22.14

-0.01 0.00 00877338-01 1/25/2006 22.15 No 22.15 N/A 0.00

Enclosure Historical Channel Calibration Results Turbine Condenser Vacuum - Low Vacuum Switches Dresden Nuclear Power Station, Units 2 and 3 Vacuum Switch Number 3-0503B Work Order Date As-Found Exceeded As-Left Drift Amount Number Administrative Tech Spec AV?

[As-Found Adjusted 21.92 to 22.48

>_ 21.4 22.00 to 22.40 - As-Left]

(inches Hg)

(inches Hg)

(inches Hg) inches H inches H 01091419-01 1/16/2008 22.03 No 22.03

-0.13 0.00 01083638-01 12/20/2007 22.16 No 22.16

-0.23 0.00 01071838-01 11/20/2007 22.39 No 22.39 0.08 0.00 01065048-01 10/17/2007 22.88 No 22.31 0.67

-0.57 01054984-01 9/21/2007 21.71 No 22.21

-0.47 0.50 01046869-01 8/17/2007 22.60 No 22.18 0.21

-0.42 01040393-01 7/16/2007 22.39 No 22.39 0.21 0.00 01029570-01 6/20/2007 22.18 No 22.18

-0.10 0.00 01021437-01 5/15/2007 21.69 No 22.28

-0.48 0.59 01011878-01 4/17/2007 23.00 No 22.17 0.80

-0.83 01000509-01 3/19/2007 21.58 No 22.20

-0.45 0.62 00994576-01 2/12/2007 22.03 No 22.03

-0.22 0.00 00985595-01 1/19/2007 21.97 No 22.25

-0.03 0.28 00979186-01 12/18/2006 22.00 No 22.00

-0.18 0.00 00966960-01 11/23/2006 22.18 No 22.18

-0.18 0.00 00956548-01 10/17/2006 22.36 No 22.36 0.05 0.00 00946312-01 9/18/2006 22.45 No 22.31 0.25

-0.14 00939177-01 8/14/2006 22.69 No 22.20 0.33

-0.49 00931702-01 7/17/2006 22.36 No 22.36 0.16 0.00 00923119-01 6/19/2006 21.86 No 22.20

-0.54 0.34 00913347-01 5/18/2006 22.40 No 22.40 0.12 0.00 00903462-01 4/17/2006 22.51 No 22.28 0.34

-0.23 00892150-01 3/20/2006 21.90 No 22.17

-0.11 0.27 00886955-01 2/13/2006 22.01 No 22.01 0.01 0.00 00877338-01 1/25/2006 22.00 No 22.00 N/A 0.00

Enclosure Historical Channel Calibration Results Turbine Condenser Vacuum - Low Vacuum Switches Dresden Nuclear Power Station, Units 2 and 3 Vacuum Switch Number 3-0503C Work Order Date As-Found Exceeded As-Left Drift Amount Number Adm inistrative Tech Spec AV?

[As-Found Adjusted 21.92 to 22.48

? 21.4 22.00 to 22.40 - As-Left]

(inches Hg)

(inches Hg)

(inches Hg) inches H inches H 01091419-01 1/16/2008 22.37 No 22.37 0.04 0.00 01083638-01 12/20/2007 21.75 No 22.33

-0.61 0.58 01071838-01 11/20/2007 22.36 No 22.36 0.08 0.00 01065048-01 10/17/2007 22.66 No 22.28 0.51

-0.38 01054984-01 9/21/2007 21.88 No 22.15

-0.49 0.27 01046869-01 8/17/2007 22.37 No 22.37 0.13 0.00 01040393-01 7/16/2007 22.45 No 22.24 0.28

-0.21 01029570-01 6/20/2007 21.85 No 22.17

-0.18 0.32 01021437-01 5/15/2007 22.03 No 22.03

-0.03 0.00 01011878-01 4/17/2007 22.45 No 22.06 0.36

-0.39 01000509-01 3/19/2007 21.83 No 22.09

-0.50 0.26 00994576-01 2/12/2007 21.95 No 22.33

-0.05 0.38 00985595-01 1/19/2007 22.00 No 22.00

-0.07 0.00 00979186-01 12/18/2006 22.07 No 22.07

-0.23 0.00 00966960-01 11/23/2006 22.30 No 22.30

-0.07 0.00 00956548-01 10/17/2006 22.37 No 22.37 0.15 0.00 00946312-01 9/18/2006 22.65 No 22.22 0.30

-0.43 00939177-01 8/14/2006 22.47 No 22.35 0.09

-0.12 00931702-01 7/17/2006 22.38 No 22.38 0.13 0.00 00923119-01 6/19/2006 21.63 No 22.25

-0.58 0.62 00913347-01 5/18/2006 22.21 No 22.21 0.08 0.00 00903462-01 4/17/2006 22.41 No 22.13 0.15

-0.28 00892150-01 3/20/2006 21.90 No 22.26

-0.14 0.36 00886955-01 2/13/2006 22.04 No 22.04

-0.06 0.00 00877338-01 1/25/2006 22.10 No 22.10 N/A 0.00

Enclosure Historical Channel Calibration Results Turbine Condenser Vacuum - Low Vacuum Switches Dresden Nuclear Power Station, Units 2 and 3 Vacuum Switch Number 3-0503D Work Order Date As-Found Exceeded As-Left

_Drift Amount Number Administrative Tech Spec AV?

[As-Found Adjusted 21.92 to 22.48

>_ 21.4 22.00 to 22.40 - As-Left]

(inches Hg)

(inches Hg)

(inches Hg) inches H inches H 01091419-01 1/16/2008 22.26 No 22.26 0.02 0.00 01083638-01 12/20/2007 21.89 No 22.24

-0.42 0.35 01071838-01 11/20/2007 22.31 No 22.31 0.06 0.00 01065048-01 10/17/2007 22.42 No 22.25 0.29

-0.17 01054984-01 9/21/2007 21.73 No 22.13

-0.51 0.40 01046869-01 8/17/2007 22.53 No 22.24 0.23

-0.29 01040393-01 7/16/2007 22.30 No 22.30 0.27 0.00 01029570-01 6/20/2007 22.03 No 22.03 0.01 0.00 01021437-01 5/15/2007 22.02 No 22.02

-0.22 0.00 01011878-01 4/17/2007 22.85 No 22.24 0.66

-0.61 01000509-01 3/19/2007 21.67 No 22.19

-0.58 0.52 00994576-01 2/12/2007 21.94 No 22.25

-0.25 0.31 00985595-01 1/19/2007 21.97 No 22.19

-0.04 0.22 00979186-01 12/18/2006 22.01 No 22.01

-0.24 0.00 00966960-01 11/23/2006 22.25 No 22.25

-0.14 0.00 00956548-01 10/17/2006 22.39 No 22.39 0.09 0.00 00946312-01 9/18/2006 22.51 No 22.30 0.20

-0.21 00939177-01 8/14/2006 22.44 No 22.31 0.19

-0.13 00931702-01 7/17/2006 22.25 No 22.25 0.20 0.00 00923119-01 6/19/2006 22.05 No 22.05

-0.22 0.00 00913347-01 5/18/2006 22.27 No 22.27 0.17 0.00 00903462-01 4/17/2006 22.10 No 22.10 0.07 0.00 00892150-01 3/20/2006 22.03 No 22.03

-0.09 0.00 00886955-01 2/13/2006 21.88 No 22.12

-0.12 0.24 00877338-01 1/25/2006 22.00 No 22.00 N/A 0.00