CPSES-200700391, Inspection and Mitigation of Alloy 82/182 Pressurizer Butt Welds

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Inspection and Mitigation of Alloy 82/182 Pressurizer Butt Welds
ML070530211
Person / Time
Site: Comanche Peak  
Issue date: 02/20/2007
From: Blevins M, Madden F
TXU Power
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
CPSES-200700391, TXX-07040
Download: ML070530211 (25)
v • d • e


Text

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  • Vce President &

Che Nuclear Officer CPSES-200700391 Log # TXX-07040 February 20, 2007 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

SUBJECT:

REF:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 INSPECTION AND MITIGATION OF ALLOY 82/182 PRESSURIZER BUTT WELDS TXU Power letter, logged TXX-07013, from Mike Blevins to the NRC dated January 30, 2007

Dear Sir or Madam:

By means of the referenced letter, TXU Generation Company LP (TXU Power) previously submitted information on inspection and mitigation of Alloy 82/182 Pressurizer Butt Welds at Comanche Peak.

As requested during a phone conversation between TXU Power and the NRC Staff on February 13, 2007, TXU Power hereby provides the following additional information.

This information was discussed with Mohan Thadani, NRC Project Manager, on February 15, 2007.

The enhanced leakage monitoring program is outlined as follows.

A,4o A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

  • Comanche Peak e Diablo Canyon 9 Palo Verde a South Texas Project
  • Wolf Creek

TXX-07040 Page 2 of 3 Required elements of the enhanced leakage monitoring program

1.

Daily measurement of unidentified leakage

2.

Identification of unidentified leakage rates greater than either of the following limits:

0.25 gpm above a baseline 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 0.25 gpm not confirmed from sources other than Pressurizer nozzle welds.

The baseline should be established using leak rates measured within 7 days after achieving Mode 1 100% power operation following the most recent bare metal visual examination of the Pressurizer Alloy 82/182 butt weld locations 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.

3.

Once the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> evaluation period is complete and the leak rate 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, safety, spray, and relief nozzle butt welds and safe-end butt welds containing Alloy 82/182 material.

4.

A positive determination that the source of the unidentified leakage did not come from the Pressurizer will negate the requirement for shutdown and Pressurizer Alloy 82/182 butt weld bare metal examination.

5.

Reports that detail inspection results of unmitigated weld examinations and any corrective or mitigative actions taken and reports on bare metal visual inspection of Pressurizer Alloy 82/182 butt welds shall be made within 60 days following restart from the plant outage in which the inspections or actions were performed.

The enhanced leakage monitoring program will supplement the existing plant programs and procedures and as such will be in place only until the Pressurizer Alloy 82/182 butt welds have been successfully mitigated.

Comanche Peak Unit 2 will implement the enhanced leakage monitoring program by March 1, 2007, and it will be in place until the Pressurizer Alloy 82/182 butt welds have been mitigated in the refueling outage scheduled to begin March 29, 2008.

TXX-07040 Page 3 of 3 Mitigation activities for Comanche Peak Unit 1 are scheduled to be completed in the refueling outage scheduled to begin February 24, 2007. Therefore, the enhanced leakage monitoring program will not be implemented on Unit 1 based on successful mitigation of Pressurizer Alloy 82/182 butt welds in the Spring 2007 outage.

TXU Power will commit to adopt contingency plans to shutdown by December 31, 2007, if the technical information being developed by MRP (or by industry) through advanced finite element analyses does not provide reasonable assurance to the NRC that PWSCC crack conditions will remain stable and not lead to rupture without significant time from the onset of detectable leakage.

This communication contains new licensing basis commitments for CPSES Units 1 and 2 in addition to the commitments made in the referenced letter which are delineated in the attachment.

Sincerely, TXU Generation Company LP By:

TXU Generation Management Company LLC, Its General Partner Mike Blevins By:

A,27LM24LL Fred W. Madden Director, Oversight and Regulatory Affairs JCH

Attachment:

Licensing Basis Commitments for Units 1 and 2 c -

James E. Dyer, Director, Office of Nuclear Reactor Regulation, NRC Bruce S. Mallett, Administrator, Region IV, NRC Mohan C. Thadani, Project Manager, NRC Resident Inspectors, CPSES

Attachment to TXX-07040 Page 1 of I Licensing Basis Commitments for Units 1 and 2 Commitment Commitment Number Description 27419 Inspection and mitigation activities of Pressurizer Alloy 82/182 butt welds for CPSES Unit 1 are scheduled to be completed during the refueling outage in Spring 2007 and for CPSES Unit 2 are scheduled to be completed during the refueling outage in Spring 2008 (as originally committed in TXX-07013).

27420 Reports that detail inspection results of unmitigated weld examinations and any corrective or mitigative actions taken and reports on bare metal visual inspection of Pressurizer Alloy 82/182 butt welds shall be made within 60 days following restart from the plant outage in which the inspections or actions were performed (revised in TXX-07040).

27421 CPSES will provide an update to the NRC as necessary regarding changes to our leakage monitoring program by March 31, 2007 (as originally committed in TXX-07013).

27422 Comanche Peak will evaluate the feasibility of plant modifications to install diverse leakage detection capability. This may include, but is not limited to, video monitoring of Pressurizer piping, acoustic monitoring in the area of the Pressurizer, sensitive humidity monitoring, and other methods currently under evaluation. Plans for any additional capability which reliably and meaningfully adds to our ability to diagnose primary system leakage, as well as installation schedules as appropriate will be submitted to the NRC by May 31, 2007 (as originally committed in TXX-07013).

27423 If Comanche Peak Units 1 or 2 should shut down prior to presently planned inspection/ mitigation outages due to unacceptable primary system leakage, and if the leakage cannot be confirmed to originate from a source other than the Pressurizer, a bare metal visual examination of Alloy 82/182 butt weld locations on the Pressurizer will be performed to determine whether the leakage originated at those locations (as originally committed in TXX-07013).

27433 Comanche Peak Unit 2 will implement the enhanced leakage monitoring program by March 1, 2007, and it will be in place until the Pressurizer Alloy 82/182 butt welds have been mitigated in the refueling outage scheduled to begin March 29, 2008.

27434 TXU Power will commit to adopt contingency plans to shutdown by December 31, 2007, if the technical information being developed by MRP (or by industry) through advanced finite element analyses does not provide reasonable assurance to the NRC that PWSCC crack conditions will remain stable and not lead to rupture without significant time from the onset of detectable leakage.

NCTPR001.R01 DATE: 02-16-07 COMMITMENT TYPE COMMITMENT REGISTER NUMBER TU ELECTRIC TOTAL PLANT SYSTEM COMMITMENT DATA FORM REG NUMBER:

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TITLE: INSPECTION AND MITIGATION ACTIVITIES OF PZR ALLOY 82/182 BUTT WELDS DESCRIPTION:

Inspection and mitigation activities of Pressurizer Alloy 82/182 butt welds for CPSES Unit 1 are scheduled to be completed during the refueling outage in Spring 2007 and for CPSES Unit 2 are scheduled to be completed during the refueling outage in Spring 2008.

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TITLE: REPORTS REQUIRED WITHIN 60 DAYS FOR PZR ALLOY 82/182 BUTT WELDS DESCRIPTION:

Reports that detail inspection results of unmitigated weld examinations and any corrective or mitigative actions taken and reports on bare metal visual inspection shall be made within 60 days following restart from the plant outage in which the inspections or actions were performed.

COMMENTS:

Reporting requirement revised from TXX-07013.

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TITLE: LEAKAGE MONITORING PROGRAM DESCRIPTION:

CPSES will provide an update to the NRC as necessary regarding changes to our leakage monitoring program by March 31, 2007.

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TITLE: DIVERSE LEAKAGE DETECTION CAPABILITY DESCRIPTION:

Comanche Peak will evaluate the feasibility of plant modifications to install diverse leakage detection capability.

This may include, but is not limited to, video monitoring of Pressurizer piping, acoustic monitoring in the area of the Pressurizer, sensitive humidity monitoring, and other methods currently under evaluation.

Plans for any additional capability which reliably and meaningfully adds to our ability to diagnose primary system leakage, as well as installation schedules as appropriate will be submitted to the NRC by May 31, 2007.

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TITLE: BARE METAL VISUAL EXAMINATIONS OF PZR ALLOY 82/182 BUTT WELDS DESCRIPTION:

If Comanche Peak Units 1 or 2 should shut down prior to presently planned inspection/mitigation outages due to unacceptable primary system leakage, and if the leakage cannot be confirmed to originate from a source other than the Pressurizer, a bare metal visual examination of Alloy 82/182 butt weld locations on the Pressurizer will be performed to determine whether the leakage originated at those locations.

COMMENTS:

Applicable for forced outages prior to mitigation of pressurizer Alloy 82/182 butt welds in Unit 1 and Unit 2.

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REG NUMBER: 27433 STATUS: OPN COMMITMENT REGISTER NUMBER:

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TITLE: ENHANCED LEAKAGE MONITORING PROGRAM FOR UNIT 2 DESCRIPTION:

Comanche Peak Unit 2 will implement the enhanced leakage monitoring program by March 1, 2007.

It will be in place until the Pressurizer Alloy 82/182 Butt Welds have mitigated in the refueling outage scheduled to begin March 29, 2008.

COMMENTS:

Required elements of the enhanced leakage monitoring program

1. Daily measurement of unidentified leakage
2.

Identification of unidentified leakage rates greater than either of the following limits:

a.

0.25 gpm above a baseline 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 0.25 gpm not confirmed from sources other than Pressurizer nozzle welds.

The baseline should be established using leak rates measured within 7 days after achieving Mode 1 100% power operation following the most recent bare metal visual examination of the Pressurizer Alloy 82/182 butt weld locations.

b.

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.

3.

Once the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> evaluation period is complete and the leak rate 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, safety, spray, and relief nozzle butt welds and safe-end butt welds containing Alloy 82/182 material.

4.

A positive determination that the source of the unidentified leakage did not come from the Pressurizer will negate the requirement for shutdown and Pressurizer Alloy 82/182 butt weld bare metal examination.

5.

Reports that detail inspection results of unmitigated weld examinations and any corrective or mitigative actions taken and reports on bare metal visual inspection shall be made within 60 days following restart from the plant outage in which the inspections or actions were performed.

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NCTPR001.R01 DATE: 02-16-07 COMMITMENT TYPE COMMITMENT REGISTER NUMBER:

TU ELECTRIC TOTAL PLANT SYSTEM COMMITMENT DATA FORM PAGE:

1 TIME: 13:37:59 LAST UPDATE DATE: 02/16/2007 STATUS: OPN REG NUMBER: 27434 I.

COMMITMENT DETAIL INFORMATION AUTHORITY

NRC PRIMARY ORG
OMGR LIC CONTACT
JCH PRIORITY
G UNITS
N N

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(ix)

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OPN 12/31/2007 (2X)

(2X)

(2X)

(2x)

TITLE:

CONTINGENCY PLANS TO SHUTDOWN UNIT 2 FOR PZR ALLOY 82/182 BUTT WELDS DESCRIPTION:

TXU Power will commit to adopt contingency plans to shutdown Comanche Peak Unit 2 by December 31,

2007, if the technical information being developed by MRP (or by industry) through advanced finite element analyses does not provide reasonable assurance to the NRC that PWSCC crack conditions will remain stable and not lead to rupture without significant time from the onset of detectable leakage.

COMMENTS:

II.

COMMITMENT REFERENCE INFORMATION SOURCE

REFERENCE:

TYPE: LTR NUM: TXX-07-000040 SEC:

PG SRC LVL:

0 REV:

ISSUE DATE: 02/21/2007 OPEN/INCORPORATING/CLOSING

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NCTPR001.R01 DATE: 02-16-07 COMMITMENT TYPE COMMITMENT REGISTER NUMBER:

TU ELECTRIC TOTAL PLANT SYSTEM COMMITMENT DATA FORM PAGE:

2 TIME: 13:37:59 LAST UPDATE DATE: 02/16/2007 STATUS: OPN REG NUMBER:

27434 II.

COMMITMENT REFERENCE INFORMATION OTHER

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TYPE:

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NCTPR001.R01 DATE: 02-16-07 COMMITMENT TYPE COMMITMENT REGISTER NUMBER:

TU ELECTRIC TOTAL PLANT SYSTEM COMMITMENT DATA FORM PAGE:

3 TIME: 13:37:59 LAST UPDATE DATE: 02/16/2007 STATUS: OPN REG NUMBER:

27434 ALL COMMITMENT INFORMATION HAS BEEN REVIEWED TO BE COMPLETE AND ACCURATE AT THIS TIME EXCEPT AS MARKED.

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