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.doc

Mike, 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.doc Creation Date 2/21/2007 12:33:03 PM From: <Glenn.Michael@aps.com>

Created By: Glenn.Michael@aps.com Recipients nrc.gov TWGWPO01.HQGWDO01 MTM (Michael Markley) aps.com Thomas.N.Weber CC Post Office Route TWGWPO01.HQGWDO01 nrc.gov aps.com Files Size Date & Time MESSAGE 344 2/21/2007 12:33:03 PM TEXT.htm 939 Revised leakage monitoring commitment.doc 55808 Mime.822 80495 Options Expiration Date:

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TAC NOS.: MD4169, MD4170, AND MD4171 Docket Nos. STN-50-528, STN-50-529STN-50-530

New Commitment:

Pressurizer Dissimilar Welds and RCS Leak Monitoring RCS Leak RCS Leak Monitoring Action RCS Leak Monitoring Re-inspection Weld Inspection Date Monitoring Levels Actions Reporting Frequency Frequency (2) (3)

Inspect by 12/31/07 Daily while the (1) A 0.1 gpm change from one Once the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Report details of Within every 4 plant is in day to the next, sustained for sustained period is inspection results of years, until the OR MODES 1-3. (4) 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 complete, and the any unmitigated weld welds are not confirmed from sources leakrate is still elevated, examination and any removed from Plant is shutdown with other than pressurizer nozzle place the unit in MODE 3 corrective or mitigative service or inspections completed prior to welds. within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and action within 60 days mitigated.

plant operation above 200 MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> of unit restart.

degrees F (average RCS (2) A 0.25 gpm above a and perform a bare temperature in Mode 5) after baseline (established using metal visual inspection Report bare metal 12/31/07 RCS leakrate information of unmitigated visual inspection collected within 7 days after pressurizer surge, spray, results within 60 days OR achieving steady state in of the unit restart.

safety and relief nozzle Commit to develop contingency MODE 1 full power operation butt welds, and safe end plans to inspect welds prior to after the most recent bare butt welds containing 12/31/07 if MRP calculations do metal visual examination) alloy 82/182 material not provide reasonable sustained for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> with assurance to the NRC. (1) 0.25 gpm not confirmed from sources other than the pressurizer nozzle welds.

Notes:

1. This commitment was made for PVNGS Unit 2 in letter 102-05640, dated January 31, 2007, by stating that APS will accelerate the Unit 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 these intervals.

3. As specified in PVNGS Technical Specification 3.4.14, RCS Operational Leakage, Surveillance Requirement 3.4.14.1, RCS water inventory balance [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 leak monitoring. This same provision is provided in NUREG-1432 Volume 1, Revision 3.0, Standard Technical Specifications Combustion Engineering 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 />.