ML080160210

Mur Power Uprate (ITSB and Srxb)

ML080160210
Person / Time
Site:	Vogtle
Issue date:	01/16/2008
From:	Alexion T NRC/NRR/ADRO/DPR
To:	Siva Lingam NRC/NRR/ADRO/DORL/LPLC
Lingam, Siva NRR/DORL 415-1564
References
TAC MD6625, TAC MD6626
Download: ML080160210 (9)

Text

From: Thomas Alexion To: Siva Lingam Date: 1/16/2008 10:59:38 AM

Subject:

Fwd: RE: Vogtle Question Info

Siva, As we just discussed, and for everybody's information, the licensee needs to submit the TRM and TRM Bases pages on the docket (the licensee's proposed TRM and TRM Bases pages look good, it's just that they need to be submitted on the docket). They should also indicate that the TRM is incorporated by reference into the FSAR, such that changes to the TRM and TRM Bases pages are subject to 50.59.

With this letter from the licensee, I believe that ITSB's (i.e., Carl's concerns) are resolved and there is no need for a license condition. I also informed Carl that what he reviewed were TRM and TRM Bases pages, not FSAR pages, and that were not submitted by the licensee on the docket. They were e-mailed to NRC for discussion purposes.

Tom

>>> Carl S Schulten 01/16/2008 9:51 AM >>>

The attached FSAR pages document that the analysis basis for the Uprated power is the Caldon UFM and that operation above the old Thermal Power limit requires calorimetric calibrations using the Caldon equipment. Therefore, I can agree that the 50.59 process will ensure the licensee will reduce thermal power if the Caldon is inop and that more importantly not reducing power with the Caldon inop would require a 50.59 review which would then require a 50.90 license amendment.

Carl Schulten Senior Reactor Engineer NRR/Technical Specifications Branch 301-415-1192 Room O12H17

>>> Siva Lingam 01/16/2008 8:10 AM >>>

>>> Diane Jackson 1/8/2008 2:47 PM >>>

Diane Jackson Reactor Systems Branch U.S. Nuclear Regulatory Commission O-9 D19; MS/O-10 B3 301-415-8548; DTJ@nrc.gov

>>> Robert Martin 12/27/2007 6:52 AM >>>

Does the attached response solve the issue?

CC: Benjamin Parks; Carl S Schulten; Diane Jackson; Gregory Cranston; James O'Driscoll; Martin Murphy; Robert Martin

From: Siva Lingam To: Carl S Schulten; Thomas Alexion Date: 1/16/2008 8:10:38 AM

Subject:

Fwd: RE: Vogtle Question Info

>>> Diane Jackson 1/8/2008 2:47 PM >>>

Diane Jackson Reactor Systems Branch U.S. Nuclear Regulatory Commission O-9 D19; MS/O-10 B3 301-415-8548; DTJ@nrc.gov

>>> Robert Martin 12/27/2007 6:52 AM >>>

Does the attached response solve the issue?

From: "Walton, Kerry M." <KMWALTON@southernco.com>

To: "Warren Lyon" <WCL@nrc.gov>

Date: 12/20/2007 11:55:33 AM

Subject:

RE: Vogtle Question Info

Warren, In response to Bob Martin's inquiry, the attached draft of the Vogtle TRM should clarify how Vogtle proposes to operate with the Caldon LEFM system out of service.

Regards, Kerry Walton Vogtle Support Power Uprate Project 205-992-5595 kmwalton@southernco.com

---

Original Message-----

From: Diane Jackson [1]

Sent: Thursday, December 20, 2007 9:03 AM To: Robert Martin; Warren Lyon Cc: Siva Lingam

Subject:

Re: Vogtle Question Info Bob -

Will you make sure this is how Vogtle would like to / intends to operate? If not, they need to supplement their submittal to explain and justify their intended operation when the CheckPlus is out of service.

Diane Diane Jackson Reactor Systems Branch U.S. Nuclear Regulatory Commission O-9 D19; MS/O-10 B3 301-415-8548; DTJ@nrc.gov

>>> Warren Lyon 12/20/2007 8:38 AM >>>

My present assessment of the way Vogtle proposes to operate if the CheckPlus is inoperable is as follows:

To operate above the presently licensed power of 3565 MWt, the licensee proposes that the CheckPlus cannot have been out-of-service for more than 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> and there cannot have been any power changes that exceed 10 percent during that 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. Power during the 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> without an operational CheckPlus will be monitored using the existing four venturis that have been recalibrated to agree with CheckPlus before the failure.

The licensee justifies this operation on the basis that there is not a significant uncertainty associated with using venturis for 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> as long as the plant is essentially operated in a steady state condition and, if a power change in excess of 10 percent should occur during the 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, then the plant thermal power will be reduced to the presently licensed 3565 MWt. The licensee is silent with respect to the venturi calibration that applies after 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

If the CheckPlus is not operable, the plant should be operated with an actual thermal power that corresponds to the actual thermal power that applied prior to the power uprate. Therefore, the NRC will require that the venturi calibration that applies after 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, or that will apply within the 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> if a power change greater than 10 percent occurs, will be the pre-CheckPlus calibration to be consistent with the uncertainty associated with using the venturis to determine thermal power. Further, the actual thermal power must be two percent lower than the value determined by use of the pre-CheckPlus venturi calibration to account for the 2 percent uncertainty that applied prior to the proposed uprate.

CC: "Siva Lingam" <SPL@nrc.gov>, "Stringfellow, N. Jack"

<NJSTRING@southernco.com>, "Hill, Lesa P." <LPHILL@southernco.com>, "Robert Martin" <REM@nrc.gov>, "Grissom, Phillip D." <PDGRISSO@southernco.com>

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

a. The Caldon LEFM CheckPlus system FUNCTIONAL

b. The Plant Integrated Plant Computer (IPC) system FUNCTIONAL APPLICABILITY: MODE 1

ACTIONS

---

NOTE--------------------------------------------------------

TR 13.0.3 is not applicable CONDITION REQUIRED ACTION COMPLETION TIME A. LEFM CheckPlus system A.1 Switch UQ1118 calorimetric Immediately NON-FUNCTIONAL display from the Ultrasonic Mode to the Normalized Venturi Mode.

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 Action and B.1 Switch UQ1118 calorimetric Immediately associated Completion display from the normalized Time of Condition A not Venturi Mode to the non-met. normalized Venturi Mode.

OR AND Core power level changes B.2 Reduce reactor core power to Immediately by more than 10% RTP <3565 MWt .

while in condition A.

C. IPC System C.1 Reduce power to <100% on 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> NON-FUNCTIONAL the highest reading NI or Delta-T AND (continued )

C.2.1 Restore the IPC to Prior to performing FUNCTIONAL status the next required nuclear instrumentation/

power calorimetric OR comparison SR 3.3.1.2 C.2.2.1 Reduce core power to Prior to performing

<98% based on the highest the next required

reading NI or Delta-T nuclear instrumentation/

power calorimetric comparison SR 3.3.1.2 TECHNICAL REQUIREMENT SURVEILLANCES SURVEILLANCE FREQUENCY TRS 13.3.7.1 Record the highest reading PR Once within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and once per hour NI or Delta-T board indication. thereafter when the IPC calorimetric calculation (UQ1118) is NON-FUNCTIONAL TRS 13.3.7.2 Locally check LEFM CheckPlus Once within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and very 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> system functional. thereafter when LEFM failure annunciator on main control board is on or inoperable.

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

Additional Information The maximum allowable reactor core power levels discussed in this Technical Requirement (TR) are based on the analyzed reactor core power level assumed in the reactor safety analysis of 3636 MWt and the magnitude of the calorimetric power determination uncertainty which is a function of the calorimetric method.

Safety Analysis Calorimetric Maximum Allowable Allowable Reactor Power Level Uncertainty Indicated Reactor Calorimetric Power Core Power Level Determination Mode 3636 0.3% 3625.6 MWt Ultrasonic Mode 3636 2.0% 3565 MWt Venturi Mode

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 is used. The Ultrasonic Mode calorimetric 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 more accurately than the functionally equivalent instrumentation from the feedwater Venturi Mode calorimetric.

This is the basis for the reduced uncertainty that is characteristic of the Ultrasonic Mode calorimetric.

The Ultrasonic Mode calorimetric can be performed using either of two methods; automatically by the Plant IPC or manually using a non-IPC calculation. The IPC method is performed with no operator involvement required. The calculated core power for the IPC Ultrasonic Mode calorimetric is displayed on the control room IPC displays. Also, IPC point UQ1118 will normally display this same value when selected to the Ultrasonic Mode of display (UQ1118 will display the Venturi Mode or normalized Venturi Mode if selected). The manual Ultrasonic Mode calorimetric is performed by operations on a calculating device other than the IPC and is controlled by a Vogtle specific procedure. This calorimetric mode requires input data gathered directly from the LEFM via the local display on the electronics panel as well as supporting process data provided by analog points displayed on the IPC. MCB indicators are not used as the source of input data for the manual Ultrasonic mode calorimetric because the increased uncertainty associated with the use of these indicators has not been included in the Ultrasonic mode calorimetric uncertainty analysis.

Both the IPC and manual methods of performing the Ultrasonic mode calorimetric power determination meet the requirements of the uncertainty analysis supporting operation at power levels greater than 3565 MWt. Whenever possible, the IPC Ultrasonic Mode calorimetric should be used to determine reactor power when operating at power levels greater than 3565 MWt.

LEFM System Operational Status For this TR, FUNCTIONAL is defined as the ability to provide feedwater mass flow, feedwater temperature and pressure at the required uncertainty level to be used as input for either the IPC Ultrasonic mode calorimetric calculation or the manual Ultrasonic mode calorimetric calculation.

The LEFM data may be retrieved from the IPC data link application (for the IPC Ultrasonic mode calorimetric) or locally via the display on the LEFM CheckPlus electronics panel (for the manual Ultrasonic Mode calorimetric).

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

Alarm Condition Discussion LEFM System Status LEFM/IPC Data The data from the LEFM cabinet is not NON-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 NON-FUNCTIONAL non-normal status affecting the uncertainty requirements for the (Alert or Failure Ultrasonic Mode Calorimetric. Specific cause of status) the status is available locally at the LEFM electronics display.

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. (Note)

Note : At the Hi-Hi limit, the cabinet internal temperature is above the setpoint for reliable system operation. The LEFM system shall be declared nonfunctional. The Hi-Hi limit is not alarmed but can be monitored from the IPC screen or locally at the cabinet.

IPC Availability Status For this TR, FUNCTIONAL condition of the IPC is defined as the ability of the IPC to perform either:

1. IPC Ultrasonic mode calorimetric calculation (indicated by functionality of IPC point UQ1118) or to provide the supporting process input data for a manual Ultrasonic mode calorimetric calculation via analog points on the IPC.

2. IPC Normalized Venturi calorimetric calculation if in Action A.1

3. IPC non-normalized Venturi calorimetric calculation if in Action B.1 When the IPC system is non-functional, reactor core power limitations for this TR shall be based on the highest reading Power Range NI channel or Delta-T channel. Operation at 100%

power based on the highest reading Power Range NI or Delta-T channel may continue until the next required nuclear instrumentation / power calorimetric comparison (SR 3.3.1.2) , which could be up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> per procedure. The IPC unavailability will result in reducing the maximum core power to 98% power or less by NI and Delta-T indication, as needed, to support a manual calorimetric power calculation without IPC display of calorimetric input points or input from the LEFM system. The 48-hour time period does not apply in this specific case.

LEFM System Outage Requirements The allowed outage time for operation at any reactor core power level in excess of 3565 MWt with the Caldon LEFM system nonfunctional is 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, provided steady state conditions persist throughout the 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> period. The bases for the proposed outage time are:

• Operations will switch to and operate the plant based on the normalized Venturi Mode calorimetric when the Caldon LEFM system is nonfunctional. This mode uses alternate plant instruments (feedwater venturies and RTDs) and shall be used for up to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> if

the Caldon LEFM system is non-functional. Although the accuracy of alternate instrumentation can degrade over time as a result of venturi fouling or transmitter drift, these effects are expected to be insignificant over the 48-hour time period. The calorimetric mode shall be switched to the non-normalized Venturi Mode for power reduction if the LEFM system can not be repaired within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

• The power calorimetric calculations (Ultrasonic Mode and Venturi Modes) are performed independently by the plant IPC. The Venturi Mode calculation uses the venturi based feed flow measurements and RTD based feedwater temperatures. The venturi based thermal power measurement is normalized to the LEFM based power measurement.

This methodology ensures the normalized venturi Mode calorimetric is consistent with the Ultrasonic Mode calorimetric at the time the LEFM system is non-functional.

• For the Caldon LEFM nonfunctional condition, the 48-hour clock will start at the time of the failure as annunciated on the main control board (with the exception of high cabinet temperature alarm).

Most repairs to the Caldon LEFM system can be made within an eight hour shift. Forty-eight hours will give plant personnel time to plan the work, make repairs, and verify normal operation of the Caldon LEFM system within its original uncertainty bounds at the same power level and indications as before the failure.

Mail Envelope Properties (478E20C3.CAA : 21 : 34920)

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Fwd: RE: Vogtle Question Info Creation Date 1/16/2008 10:20:35 AM From: Thomas Alexion Created By: TWA@nrc.gov Recipients nrc.gov OWGWPO03.HQGWDO01 GVC CC (Gregory Cranston) nrc.gov OWGWPO04.HQGWDO01 DTJ CC (Diane Jackson) nrc.gov TWGWPO01.HQGWDO01 MCM2 CC (Martin Murphy)

REM CC (Robert Martin)

SPL (Siva Lingam) nrc.gov TWGWPO02.HQGWDO01 CSS1 CC (Carl S Schulten) nrc.gov TWGWPO03.HQGWDO01 BTP CC (Benjamin Parks)

JGO1 CC (James O'Driscoll)

Post Office Route OWGWPO03.HQGWDO01 nrc.gov OWGWPO04.HQGWDO01 nrc.gov TWGWPO01.HQGWDO01 nrc.gov

TWGWPO02.HQGWDO01 nrc.gov TWGWPO03.HQGWDO01 nrc.gov Files Size Date & Time MESSAGE 3032 1/16/2008 10:20:35 AM Options Expiration Date: None Priority: Standard ReplyRequested: No Return Notification: None Concealed

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Subject:

RE: Vogtle Question Info Creation Date 12/20/2007 11:54:03 AM From: "Walton, Kerry M." <KMWALTON@southernco.com>

Created By: KMWALTON@southernco.com Recipients nrc.gov TWGWPO01.HQGWDO01 WCL (Warren Lyon)

SPL CC (Siva Lingam)

REM CC (Robert Martin) southernco.com PDGRISSO CC (Phillip D. Grissom)

LPHILL CC (Lesa P. Hill)

NJSTRING CC (N. Jack Stringfellow)

Post Office Route TWGWPO01.HQGWDO01 nrc.gov southernco.com Files Size Date & Time MESSAGE 2572 12/20/2007 11:54:03 AM Caldon TRM DCP VER 2.doc 103936 Mime.822 149992 Options Expiration Date: None Priority: Standard ReplyRequested: No Return Notification: None Concealed

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