ML070650202
| ML070650202 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 01/23/2007 |
| From: | FirstEnergy Nuclear Operating Co |
| To: | Office of Nuclear Reactor Regulation |
| Wengert, Thomas | |
| Shared Package | |
| ML070640397 | List: |
| References | |
| TAC MD3991 | |
| Download: ML070650202 (18) | |
Text
Agenda Opening Remarks, Introductions, Background John Grabnar-Director, Davis-Besse Site Engineering Proposed Amendment Henry Hegrat - Supervisor, Fleet Licensing Proposed Submittal Schedule Greg Halnon-Director, Fleet Regulatory Affairs Discussion.and Questi.ns cusona 4,
on
Desired Outcomes Pp Inform the NRC of FENOC's plans regarding a proposed power uprate for the DBNPS I* Discuss unique features of the submittal PP Provide schedule considerations Answer any questions and obtain feedback from the NRC
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Background===
" Plant calorimetric measurement calculation currently utilizes venturi-based feedwater flow indication.and resistance temperature detector temperature data
- Caldon Inc. Leading Edge Flow Meter (LEFM)
CheckPlus TM System installed at the DBNPS (2004)
- Spool pieces have been installed in each 18-inch feedwater line
- sixteen ultrasonic transducer assemblies per spool piece Uses acoustic pulses to determine main feedwater flow and temperature for input to plant calorimetric Increased accuracy compared to feedwater venturi and RTD NO'
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Background===
- A License Amendment Request (LAR) is under preparation proposing a Measurement Uncertainty Recapture (MUR) Power Uprate to take advantage of the increased accuracy of the installed LEFM equipment Current Rated Thermal Power (RTP) is 2772 MWt Proposed RTP increase to 2817 MWt (-1.63%)
ENC E
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Background===
- LAR will be consistent with the format and guidance of NRC Regulatory Issue Summary (RIS) 2002-03, "Guidance on the Content of Measurement Uncertainty Recapture Power Uprate Applications" rENOC
Unique Features of LAR
" Reactor Protection System (RPS) High Flux Allowable Value Setpoints are dependent upon operability of the Ultrasonic Flow Meter
- Preserve margin to analytical limit
- Preserve operating margin
" A new Limiting Condition for Operation (LCO) for the Ultrasonic Flow Meter is proposed
Technical Specification (TS) Changes U Operating License Paragraph 2.C.(1)
- Maximum Power Level raised to 2817 MWt
- TS 1.3, Definitions
- RATED THERMAL POWER raised to 2817 MWt m TS 2.2.1, Limiting Safety System Settings - Reactor Protection System Setpoints
- High Flux Allowable Value Setpoints revised 179
TS Changes (cont'd) 0 TS 3/4.3, Instrumentation Application of a note establishing requirements for the treatment of as-found and as-left RPS high flux setpoints, consistent with License Amendment No. 274 Addition of new LCO for Ultrasonic Flow Meter
" TS 3.7.1.3, Condensate Storage Tanks Calculation was revised using current standards and updated assumptions, resulting in a more conservative value for minimum usable tank volume
- TS 6.9.1.7, Administrative Controls Addition of references to Caldon Topical Reports WOMM100
High Flux Setpoints m Currently TS 2.2.1 contains two High Flux Allowable Value setpoints:
S105.1% of RTP for four Reactor Coolant Pump operation 80.6% of RTP for three Reactor Coolant Pump operation
High Flux Setpoints
- Four pump High Flux Allowable Value setpoint is proposed to be changed to 104.9% of RTP if Ultrasonic Flow Meter used
- Accommodate the power increase (RTP of 2817 MWt)
Reduced heat balance error (0.37% vs. 2%)
- Four pump High Flux Allowable Value setpoint is RTP if Ultrasonic proposed to be changed to 103.3% of Flow Meter is not used
- Retain margin to analytical limit ZNC
High FlxStpitI M
var ins>.,
Marginto Anayt
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- i,'
Ir,', I:I~~i:
- 1 Operat,.
Current Proposed:
High Flux Setpoints
- Three pump High Flux Allowable Value setpoint does not require change 80.6% of 281.7 MWt has been validated for the current operating cycle
- Setpoint will be validated for each future core reload
Ultrasonic Flow Meter Operability
- Typical amendments associated with MUR power uprates allow actions for an inoperable Ultrasonic Flow Meter to be specified in alicensee controlled document (e.g., DBNPS Technical Requirements Manual)
- Since DBNPS LAR proposes RPS High Flux Allowable Value setpoints that are dependent upon Ultrasonic Flow Meter use, it is believed to be prudent to specify actions for an inoperable Ultrasonic Flow Meter in the TS rather than in a licensee controlled document
Proposed Ultrasonic Flow Meter TS
- Actions if Ultrasonic Flow Meter is not operable or not in use for heat balance calculation are as follows:
Prior to the next heat balance calculation, reduce power to
_<98.4% of RTP with four pumps operating or <73.8% of RTP with three pumps operating Within ten hours after the next heat balance calculation, reduce the RPS High Flux setpoint in accordance with TS 2.2.1 Affords reasonable time period to recalibrate instruments Nuclear Instrument and setpoint drift would be negligible over the allotted time period
- The Ultrasonic Flow Meter shall be demonstrated operable by performance of a channel check at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />
'zENOC
Supporting Analysis and Calculations
- Caldon Inc. Engineering Report-80P, "Improving Thermal Power Accuracy and Plant Safety While Increasing Operating Power Level Using the LEFMVTMSystem," Revision 0, dated March, 1997
- Caldon Inc. Engineering Report-157P, "Supplement to Topical Report ER-80P: Basis for a Power Uprate With the LEFM V/TMor LEFM CheckPlus TmSystem," Revision 5, dated October, 2001
- AREVA Report No. 51-9004090-004, "FirstEnergy Nuclear Operating Company, Davis-Besse Nuclear Power Station, Measurement Uncertainty Recapture, Power Uprate Summary Report," dated January 7, 2007
- AREVA NP Calculation 32-5012428-07, "Davis-Besse Heat Balance Uncertainty, dated October, 2006
Closing Remarks
" Schedule Considerations LAR scheduled for submittal in February 2007 following onsite.and offsite safety review board approvals Approval requested within one year of submittal, with implementation within 120 days of amendment issuance
" Further Discussion and Questions
" Action Item Summary mFiNtrr