SBK-L-08103, Notification of Completed Actions and Commitments Addressed in Confirmatory Action Letter in Regard to Alloy 82/182 Butt Welds in the Pressurizer

Notification of Completed Actions and Commitments Addressed in Confirmatory Action Letter in Regard to Alloy 82/182 Butt Welds in the Pressurizer

ML082261410
Person / Time
Site:	Seabrook
Issue date:	06/18/2008
From:	St.Pierre G Florida Power & Light Energy Seabrook
To:	Dyer J Office of Nuclear Reactor Regulation
References
SBK-L-08103
Download: ML082261410 (7)

Text

FPL Energy Seabrook Station FPL Energy P.O. Box 300 Seabrook, NH 03874 ri Seabrook Station (603) 773-7000 June 18, 2008 Docket No. 50-443 SBK-L-08103 U.S. Nuclear Regulatory Commission Attn.:. J. E. Dyer, Director Office of Nuclear Reactor Regulation One White Flint North 11555 Rockville Pike Rockville, MD 20852-2837 Seabrook Station Notification of Completed Actions and Commitments Addressed in Confirmatory Action Letter In Regard to Alloy 82/182 Butt Welds in the Pressurizer at Seabrook Unit No. 1

Reference:

NRC CAL No. NRR-07-001, Confirmatory Action Letter, Seabrook Station, Unit No. 1, dated March 12, 2007.

FPL Energy Seabrook, LLC (FPL Energy Seabrook) has completed the actions and commitments addressed in the above reference. FPL Energy Seabrook is providing in the enclosure to this letter the results of the pressurizer butt weld inspections and mitigation actions.

Should you have any questions regarding the examination results, please contact Michael Ossing, Engineering Support Manager, at (603) 773-7512.

Sincerely, FPL Energy Seabrook, LLC Gene St. Pierre Site Vice President cc: S.J. Collins, NRC Region I Administrator G.E. Miller, NRC Project Manager, Project Directorate 1-2 W.J. Raymond, NRC Senior Resident Inspector a0 I an FPL Group company  ! *J$0

OATH AND AFFIRMATION I, Gene St. Pierre, Site Vice President of FPL Energy Seabrook, LLC, hereby affirm that the information and statements contained within this Notification of Completed Actions and Commitments Addressed in Confirmatory Action Letter NRR-07-001 are based on facts and circumstances which are true and accurate to the best of my knowledge and belief.

Sworn and Subscribed before me this day of 2008 ene Site Vice President

/

ENCLOSURE TO SBK-L-08103 Summary of NDE results for Pressurizer Weld Overlay PZR A Safety Nozzle No Recordable NRI, Barrier Layer NRI prior to Five indications were recorded. Four were laminar, lack of bond (LOB)

Indications excavation of indications and one was planar. Below are the dimensions and dispositions (NRI) - Indications adjacent to the volumetric of the indications.

barrier layer were indications Ind. # 1 - 9.80"L x .30"W, Reject identified during the Ind. # 2 - 1.00"L x .30"W, Accept barrier layer PT.

Ind. # 3 - 1.90"L x .30"W, Accept Excavation performed Ind. # 4 - 0.50"L x .30"W, Accept Excavation PT NRI after Ind. # 5 - 2.00"L x .30"W, Reject volumetric Indications # 1 & # 5 excavated and repaired. Indication # 3 was

- Indications identified after indication removal removed/repaired due to it's proximity to the repair cavity. Post repair UT grinding. Excavated to a depth of -. 220" was acceptable.

PT of Excavation area after Indications # 2 and # 4 remain after repairs weld restoration to base UT examination achieved full coverage of both the ISI and PSI examination material - NRI volumes.

PT of SWOL excavation to remove volumetric (UT) indication - NRI The UT exam was acceptable. Three indications were reported. Two were lack of bond (LOB); the other was planar and located within the ISI volume of the original dissimilar metal weld base material. Below are the dimensions and dispositions of the indications.

PZR B Relief Nozzle NRI NRI NRI Ind. # I - 1.10"L x .30"W, Accept Ind. # 2 - 0.80"L x .20"W, Accept Ind. # 3 - 1.2"L Accept per analysis of weld overlay design by vendor.

UT examination achieved full coverage of both the IS1 and PSI examination volumes

One circumferential lack of bond indication was reported in the nozzle radius to taper transition area. The indication dimensions and disposition is NRI prior to below.

excavation of volumetric NRI, Barrier Layer Ind. # 1 - 13.2"L x .40"W, Reject indications Indication # 1 excavated and repaired. The UT of the repair area was PZR C Safety Nozzle NRI PT of SWOL excavation to acceptable. Two lack of bond indications were reported, their dimensions remove volumetric (UT) are listed below indication - NRI NRI after Ind. # 1 - .50"L x .30"W volumetric Ind. # 2 - .40"L x .30"W indication removal UT examination achieved full coverage of both the ISI and PSI examination volumes 4 4 4 Two circumferential lack of bond indication were reported. One was at the nozzle radius to taper transition area and the other was over the safe end material at the interface of the weld overlay and the base material. Below NRI prior to excavation of are the dimensions and dispositions of the indications.

volumetric Ind. # 1 - 4.7"L x .30"W, Reject NRI, Barrier Layer indications Ind. # 2 - 29.0"L(360') x .40"W, Reject PZR D Safety Nozzle NRI PT of SWOL excavation to Indications # 1 & # 2 excavated and repaired. The UT of the repair areas remove volumetric (UT) was acceptable. Two lack of bond indications were reported, their indication - NRI dimensions are listed below NRI after Ind. # 1 - .70"L x .20"W volumetric Ind. # 2 - .70"L x .20"W indication removal UT examination achieved full coverage of both the ISI and PSI examination volumes The UT exam was acceptable. Three indications were recorded in the original dissimilar metal weld base material. These indications are below the PZR Spray Nozzle NRI NRI NRI ISI examination volume.

UT examination achieved full coverage of both the ISI and PSI examination volumes.

Four circumferential indications were reported/recorded. One was a lack of NRI prior to bond (LOB) and the other three were located within the original dissimilar excavation of metal weld base material outside the ISI examination volume. Below are the volumetric dimensions and dispositions of the indications.

NRI, Barrier Layer indications Ind. # I - 51.8'L (360°)x .30"W, Reject PZR Surge Nozzle NRI PT of SWOL excavation to Ind. # 2, # 3 and # 4 were recorded for future reference and were not remove volumetric (UT) evaluated.

indication - NRI Indication # 1 excavated and repaired. The UT of the repair was acceptable.

NRI after volumetric UT examination achieved full coverage of both the ISI and PSI examination indication removal volumes.

a Mitigation Summary The Seabrook Station pressurizer has six piping nozzle welds that were originally made with alloy 82/182 material as identified in the table below. During OR12 refueling outage all six piping nozzles were mitigated using alloy 52 by the method shown below.

Nozzle Mitigation Completed Susceptible Outage Mitigation Performed Function/Designation Material Oution Description Designation Surge "S" Nozzle to safe end OR12 Structural Weld Overlay Line # RC-49-01 weld only Spray "SP" Nozzle to safe end OR12 Structural Weld Overlay Line # RC-48-03 weld only Safety "A" Nozzle to safe end OR12 Structural Weld Overlay Line # RC-74-01 weld only Relief "B" Nozzle to safe end OR12 Structural Weld Overlay Line # RC-80-01 weld only Safety "C" Nozzle to safe end OR12 Structural Weld Overlay Line # RC-75-01 weld only Safety "D" Nozzle to safe end OR12 Structural Weld Overlay Line # RC-76-01 weld only