NL-08-0106, Supplemental Information Supporting Review of the Measurement Uncertainty Recapture Power Uprate Amendment Request

Supplemental Information Supporting Review of the Measurement Uncertainty Recapture Power Uprate Amendment Request

ML080300576
Person / Time
Site:	Vogtle
Issue date:	01/30/2008
From:	Stinson L Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-08-0106
Download: ML080300576 (9)

Text

L M. Stinson (Mikel Southern Nuclear Vice President Operating Company, Inc.

Fleet Operations Support 40 Inverness Center Parkway Post Office Box 1295 Birmingham. Alabama 35201 Tel 205.992.5181

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Fax 205.992.0341 SOUTHERN COMPANY January 30, 2008 Energy to Serve YtJur WorIJ'M Docket Nos.: 50-424 NL-08-0106 50-425 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant Supplemental Information Supporting Review of the Measurement Uncertainty Recapture Power Uprate Amendment Request Ladies and Gentlemen:

On August 28,2007, Southern Nuclear Operating Company (SNC) submitted a request to change the licensed maximum power level for Vogtle Electric Generating Plant (VEGP) Units 1 and 2 (letter NL-07-1020). SNC proposed to increase the licensed maximum power level by 1.7% by performing a measurement uncertainty recapture power uprate (MURPU). On December 21, 2007, SNC submitted responses (letter NL-07-2346) to requests for additional information (RAI) from the NRC dated November 20,2007, and November 29, 2007.

Subsequent to responding to the RAls, SNC was requested to provide the NRC with the Technical Requirements that will be incorporated into the VEGP Unit 1 and Unit 2 Technical Requirements Manual (TRM), stipulating actions to be taken when the Leading Edge Flow Meter (LEFM) based calorimetric is not functional.

The Technical Requirements are included in the enclosure.

The TRM is incorporated by reference in Section 16.3.9 of the VEGP Unit 1 and Unit 2 Updated Final Safety Analysis Report (UFSAR). As discussed in UFSAR Section 16.3.9, changes to the TRM are controlled by SNC in accordance with the processes in 10 CFR 50.59.

(Affirmation and signature are provided on the following page.)

U. S. Nuclear Regulatory Commission NL-08-0106 Page 2 L. M. Stinson states he is a Vice President of Southern Nuclear Operating Company, is authorized to execute this oath on behalf of Soutliern Nuclear Operating Company and to the best of his knowledge and belief, the facts set forth in this letter are true.

This letter contains no NRC commitments. If you have any questions, please advise.

Respectfully submitted, SOUTHERN NUCLEAR OPERATING COMPANY L. M. Stinson Vice President Fleet Operations Support Sworn to and subscribed before me this30 ti day of Jan Udn; ,2008.

Ma.vJ4 "Notary Public My commission expires: .J: I'} s; .)010 LMS/DRG/daj

Enclosure:

Technical Requirement 13.3.7 Ultrasonic Mode Calorimetric cc: Southern Nuclear Operating Company Mr. J. T. Gasser, Executive Vice President Mr. T. E. Tynan, Vice President - Vogtle Mr. D. H. Jones, Vice President - Engineering RType: CVC7000 U. S. Nuclear Regulatory Commission Mr. V. M. McCree, Acting Regional Administrator Mr. S. P. Lingam, NRR Project Manager - Vogtle Mr. G. J. McCoy, Senior Resident Inspector - Vogtle State of Georgia Mr. N. Holcomb, Commissioner - Department of Natural Resources

Vogtle Electric Generating Plant Enclosure Technical Requirement 13.3.7 Ultrasonic Mode Calorimetric

Ultrasonic Mode Calorimetric TR 13.3.7 13.3 Instrumentation TR 13.3.7 Ultrasonic Mode Calorimetric TR 13.3.7 The Ultrasonic Mode Calorimetric shall be FUNCTIONAL with:

a. The Caldon LEFM CheckPlus system FUNCTIONAL, and

b. The Integrated Plant Computer (IPC) calorimetric (UQ1118)

FUNCTIONAL.

APPLICABILITY: MODE 1 with THERMAL POWER> 3565 MWt.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. LEFM CheckPlus system A.1 Switch UQ1118 calorimetric Immediately not FUNCTIONAL. display from the Ultrasonic Mode (Ccal) to the Normalized Venturi Mode (Neal).

AND A.2 Restore the LEFM 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> CheckPlus system to FUNCTIONAL status.

B. Required Actions and B.1 Switch UQ1118 calorimetric Immediately associated Completion display from the Normalized Times of Condition A not Venturi Mode (Neal) to the met. non-normalized Venturi Mode (Veal).

AND B.2 Reduce reactor core power Immediately to ~ 3565 MWt.

(continued)

Vogtle Units 1 and 2 13.3 - 19 Rev.

Technical Requirement

Ultrasonic Mode Calorimetric TR 13.3.7 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME C. IPC Calorimetric C.1 Verify reactor core power 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> (UQ1118) not ~ 3625.6 MWt by ensuring FUNCTIONAL for reasons the higher of average Power other than Condition A. Range NIS or Delta-T indications ~ 100 %RTP.

AND C.2 Restore the IPC Calorimetric Prior to performing (UQ1118) to FUNCTIONAL the next required status. power range channel calorimetric heat balance comparison per SR 3.3.1.2 D. Required Actions and D.1 Reduce reactor core power Immediately associated Completion to ~ 3565 MWt ensuring the Times of Condition C not higher of average Power met. Range NIS or Delta-T indications ~ 98.3% RTP.

Vogtle Units 1 and 2 13.3 - 20 Rev.

Technical Requirement

Ultrasonic Mode Calorimetric TR 13.3.7 TECHNICAL REQUIREMENT SURVEILLANCES SURVEILLANCE FREQUENCY TRS 13.3.7.1 Verify that the most recent performance of SR 3.3.1.2 is Prior to exceeding based on an Ultrasonic Mode Calorimetric (Ccal). 3565 MWt.

TRS 13.3.7.2 Locally verify LEFM CheckPlus system FUNCTIONAL. With LEFM CheckPlus system FUNCTIONAL, once within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> with the Main Control Board (MCB) LEFM trouble annunciator illuminated or not FUNCTIONAL.

Every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> thereafter.

TRS 13.3.7.3 Perform LEFM CheckPlus electronics and system Once per 18 months maintenance in accordance with plant procedures.

TRS 13.3.7.4 Perform calibration of instrumentation and IPC Once per 18 months computer points to support calorimetric (UQ1118) in accordance with plant procedures.

Vogtle Units 1 and 2 13.3 - 21 Rev.

Technical Requirement

Ultrasonic Mode Calorimetric B TR 13.3.7 B TR 13.3.7 Ultrasonic Mode Calorimetric BASES The reactor core power levels discussed in this Technical Requirement (TR) are based on the reactor core power level assumed in the reactor safety analysis and the magnitude of the calorimetric power determination uncertainty which is a function of the calorimetric method.

Operation at indicated core power levels above 3565 MWt requires a calorimetric power uncertainty determination of less than 2.0%. This is only possible if the Ultrasonic Mode calorimetric (Ccal) is functional. The Ccal is unique in that it receives feedwater mass flow, feedwater temperature, and feedwater pressure inputs directly from the Caldon LEFM CheckPlus system. The LEFM system measures and transmits this data with lower uncertainty than the functionally equivalent instrumentation from the feedwater Venturi Mode calorimetric.

The reduced uncertainty that is characteristic of the Ultrasonic Mode calorimetric requires a FUNCTIONAL LEFM System to provide the feedwater parameters listed above as well as a FUNCTIONAL IPC Calorimetric (UQ1118) for performing the thermal power calculations. The Normalized Venturi calorimetric (Ncal) will support operation above 3565 MWt and the required Power Range NIS channel adjustments for power level monitoring for up to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> while the LEFM system is not FUNCTIONAL. Upon the expiration of the 48-hour allowed outage time, reactor core power is reduced to ~ 3565 MWt. Use of a non-normalized venturi-based calorimetric does not support operation above 3565 MWt.

Vogtle Units 1 and 2 B 13.3 - 1 Rev. 0 Technical Requirement Bases

Ultrasonic Mode Calorimetric B TR 13.3.7 BASES (continued)

FUNCTIONALITY REQUIREMENTS LEFM CheckPlus System For this TR, "FUNCTIONAL" is defined as the ability of the system to calculate and communicate feed water mass flow, feedwater temperature and pressure at the required uncertainty level to be used as input for the IPC Ultrasonic Mode calorimetric calculation (Ccal).

The LEFM electronics package and the IPC/LEFM data link application perform extensive self monitoring and diagnostics to ensure proper operation. Conditions which impact the LEFM status, LEFM/IPC communication status, or electronics cabinet internal temperature will trigger a MCB annunciator. An available IPC screen may be reviewed to determine what condition has caused the annunciator to alarm. More detailed diagnostic information is available locally at the LEFM electronics cabinet display screen.

MCB Annunciator Discussion LEFM System Status Condition LEFM/IPC Data The data from the LEFM cabinet is not NOT FUNCTIONAL communication communicating properly to the IPC. The IPC link has failed Ultrasonic Mode for calorimetric determination is impacted. Alarm condition.

LEFM meter in The LEFM system has experienced a failure NOT FUNCTIONAL non-normal affecting the uncertainty requirements for the status Ultrasonic Mode Calorimetric. Specific cause of the status is available locally at the LEFM (Alert or Failure electronics display.

status)

LEFM Electronics The temperature of the LEFM electronics cabinet FUNCTIONAL cabinet internal is above the high temperature setpoint. The temperature is LEFM system can continue to meet the above the high uncertainty requirements for the Ultrasonic Mode setpoint. Calorimetric. MCB annunciator will be triggered when High Temperature limit has been exceeded to allow monitoring and corrective action prior to exceeding the Hi-Hi limit.

Failure to restore the LEFM CheckPlus system to FUNCTIONAL status will result in reducing the reactor core power to ~ 3565 MWt.

Vogtle Units 1 and 2 B 13.3 - 2 Rev. a Technical Requirement Bases

Ultrasonic Mode Calorimetric B TR 13.3.7 BASES (continued)

(PC Calorimetric (UQ1118)

For this TR, "FUNCTIONAL" condition of the IPC Calorimetric (UQ1118) is defined as the ability of the IPC to perform the following calculations for the UQ1118 thermal power indication:

1. IPC Ultrasonic Mode calorimetric calculation (Ccal) (See Note Below)

2. IPC Normalized Venturi Mode calorimetric (Neal) calculation if in Action A.1

3. IPC non-normalized Venturi Mode calorimetric (V-cal) calculation if in Action B.1 When the IPC Calorimetric (UQ1118) is not FUNCTIONAL, reactor core power limitations for this TR are based on the higher of the average Power Range NIS or Delta-T indications.

Operation at 100% power may continue until the next Tech Spec required power range channel calorimetric heat balance comparison per SR 3.3.1.2, which could be up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from entry into Condition C. Failure to restore the IPC Calorimetric (UQ1118) to FUNCTIONAL status will result in reducing the core power to ~3565 MWt (~98.3% RTP based on the higher of the average Power Range NIS or Delta-T indications). For the purpose of power level monitoring, adjustments of the Power Range NIS indication based on the use of a manual non-normalized venturi-based calorimetric does not support operation above 3565MWt.

Note: A condition causing the LEFM CheckPlus system to be not FUNCTIONAL (Condition A) does not require entry into Condition C.

Vogtle Units 1 and 2 B 13.3 - 3 Rev. 0 Technical Requirement Bases