ML070660365

2/21/2007 E-Mail to M. Markley, NRR/DORL/LPL4, from M. Glenn, Arizona Public Service Company, Subject: Revised Leakage Monitoring Commitment, Related to Confirmatory Action Letter (TAC Nos. MD4169, MD4170, and MD4171)

ML070660365
Person / Time
Site:	Palo Verde
Issue date:	02/21/2007
From:	Glenn M Arizona Public Service Co
To:	Markley M NRC/NRR/ADRO/DORL/LPLIV
Markley, M T, NRR/DORL/LP4, 301-415-5723
References
TAC MD4169, TAC MD4170, TAC MD4171
Download: ML070660365 (3)

Text

From: <Glenn.Michael@aps.com>To:<MTM@nrc.gov>Date: 2/21/2007 12:34:06 PM

Subject:

Revised leakage monitoring commitment.docMike,Attached is a Word file of the latest leakage monitoring commitments with the adjustments as discussed this morning. I bracketed the change to footnote 1 because this is changing the previous commitment that is referenced. Let me know if you need anything else for this.Thanks,Glenn <<Revised leakage monitoring commitment.doc>>

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Revised leakage monitoring commitment.docCreation Date2/21/2007 12:33:03 PM From: <Glenn.Michael@aps.com>Created By:Glenn.Michael@aps.com Recipientsnrc.gov TWGWPO01.HQGWDO01 MTM (Michael Markley)aps.com Thomas.N.Weber CCPost OfficeRoute TWGWPO01.HQGWDO01nrc.gov aps.comFilesSizeDate & Time MESSAGE3442/21/2007 12:33:03 PM TEXT.htm939 Revised leakage monitoring commitment.doc 55808 Mime.82280495Options Expiration Date:

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• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • TAC NOS.:MD4169, MD4170, AND MD4171Docket Nos.STN-50-528, STN-50-529STN-50-530 New Commitment

Pressurizer Dissimilar Welds and RCS Leak MonitoringWeld Inspection Date RCS LeakMonitoring Frequency (2) (3)RCS Leak Monitoring Action Levels RCS Leak MonitoringActionsReportingRe-inspectionFrequencyInspect by 12/31/07 OR Plant is shutdown withinspections completed prior to plant operation above 200 degrees F (average RCS temperature in Mode 5) after

12/31/07 OR Commit to develop contingencyplans to inspect welds prior to 12/31/07 if MRP calculations do not provide reasonable assurance to the NRC.

(1)Daily while the plant is in MODES 1-3.

(4)(1) A 0.1 gpm change from one day to the next, sustained for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> with at least 0.1 gpm not confirmed from sources other than pressurizer nozzle welds. (2) A 0.25 gpm above abaseline (established using RCS leakrate information collected within 7 days after achieving steady state in MODE 1 full power operation after the most recent bare metal visual examination) sustained for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> with 0.25 gpm not confirmed from sources other than the pressurizer nozzle welds.Once the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />sustained period is complete, and the leakrate is still elevated, place the unit in MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> and perform a bare metal visual inspection of unmitigated pressurizer surge, spray, safety and relief nozzle butt welds, and safe end butt welds containing alloy 82/182 material Report details ofinspection results of any unmitigated weld examination and any corrective or mitigative action within 60 days of unit restart.Report bare metalvisual inspection results within 60 days of the unit restart.Within every 4years, until the welds are removed from service or mitigated.Notes: 1.This commitment was made for PVNGS Unit 2 in letter 102-05640, dated January 31, 2007, by stating that APS will accelerate theUnit 2 weld overlays currently scheduled for the spring of 2008 if analytical results do not [provide reasonable assurance to the NRC demonstrate that current schedules are adequate]

or if new information is obtained during upcoming inspections that challenge current assumptions.

2.PVNGS Technical Specification Surveillance Requirement 3.0.2, which allows 1.25 times the interval specified in the Frequency applies to theseintervals.

3.As specified in PVNGS Technical Specification 3.4.14, "RCS Operational Leakage," Surveillance Requirement 3.4.14.1, RCS water inventorybalance [leak monitoring] is not required to be performed until 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after establishment of steady state operation and applies to this leakmonitoring. This same provision is provided in NUREG-1432 Volume 1, Revision 3.0, "Standard Technical Specifications Combustio nEngineering Plants," Specification 3.4.13, "RCS Operational Leakage," Surveillance Requirement 3.4.13.1.

4."Daily" is defined as a frequency of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.