NL-16-0421, Full Structural Weld Overlays on Reactor Recirculation and Residual Heat Removal Systems, Nondestructive Examination Results - Spring 2016 Outage (1R27)

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Full Structural Weld Overlays on Reactor Recirculation and Residual Heat Removal Systems, Nondestructive Examination Results - Spring 2016 Outage (1R27)
ML16077A320
Person / Time
Site: Hatch Southern Nuclear icon.png
Issue date: 03/17/2016
From: Pierce C
Southern Co, Southern Nuclear Operating Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-16-0421
Download: ML16077A320 (6)
v • d • e


Text

Charles R. Pierce Southern Nuclear Regulatory Affairs Director Operating Company, Inc.

40 Inverness Center Parkway Post Office Box 1295 Birmingham, AL 35242 Tel 205.992.7872 SOUTHERN * \

NUCLEAR Fax 205.992.7601 A SOUTHERN COMPANY MAR 1 7 2016 Docket Nos.: 50-321 NL-16-0421 U. S. Nuclea r Regulatory Commi ssion A TIN: Docum ent Control Desk Washington, D. C. 20555-0001 Edwin I. Hatch Nuclea r Plant- Unit 1 Full Structural Weld Overlays on Reacto r Recirculation and Residual Heat Removal System s Nondestructive Examination Result s- Spring 2016 Outage (1R27)

Ladies and Gentlemen:

By letter dated Decem ber 18, 2015, the Nuclea r Regula tory Commi ssion (NRC) approv ed the use of inservice inspection (lSI) Alternative HNP-ISI-ALT-1 5-01.

This Alternative allowed the installation of full structural weld overlay s (FSWOL) on four welds at Edwin I. Hatch Nuclea r Plant (HNP) Unit 1 during the spring 2016 refueling outage. Below is the lSI weld identification numbe r for each of the four welds:

  • 1E11-1 RHR-2 4A-R-1 3 The lSI Alternative stated (in part) that Southern Nuclea r Operating Compa ny (SNC) will provide the NRC, within 14 days after the completion of the ultrasonic examination of the weld overlay installations, (1) the examination results of the weld overlays, and (2) a discussion of any repairs to the overlay materia l and/or base metal and the reason for repair."

The nondestructive examination (NDE) was completed on March 6, 2016.

The attache d Table 1 docum ents the examination results and includes a description of any repairs and the reasons for the repairs. These NDE examination results suppor t the position that the weld overlays are acceptable for service The Alternative requires the lSI ultrasonic examination to be repeate d in either the 1 R28 or the 1R29 outage. This letter satisfies the 14-day examin ation reporting requirements.

U.S. Nuclear Regulatory Commission NL Page2 This letter contains no NRC commitments. If you have any questions, please contact Ken McElroy at (205) 992-7369.

Respectfully submitted,

c. -R. B>>

C. R. Pierce Regulatory Affairs Director CRP/RMJ

Enclosure:

Hatch Unit 1 Weld Overlay Examination Results and Repairs during the 1R27 Outage cc: Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Best, Executive Vice President & Chief Nuclear Officer Mr. D. R. Vineyard, Vice Preside nt- Hatch Mr. M. D. Meier, Vice Preside nt- Regulatory Affairs Mr. D. R. Madison, Vice Preside nt- Fleet Operations Mr. B. J. Adams, Vice Preside nt- Engineering Mr. G. L. Johnson, Regulatory Affairs Manager - Hatch RTYPE: CHA02.004 U.S. Nuclear Regulatory Commission Ms. C. Haney, Regional Administrator Mr. M. D. Orenak, NRR Project Manag er- Hatch Mr. D. H. Hardage, Senior Resident Inspect or- Hatch E-2

Edwin I. Hatch Nuclear Plant - Unit 1 Full Structural Weld Overlays on Reactor Recirculation and Residual Heat Removal Systems Nondestructive Examination Results - Spring 2016 Outage (1 R27)

Enclosure Hatch Unit 1 Weld Overlay Examination Results and Repairs during the 1R27 Outage

Enclosure to NL-16-0421 Hatch Unit 1 Weld Overlay Examination Results and Repairs during the 1R27 Outage Weld Sacrificial Completed WOL Base Metal PT POl UT Exam Post-WOL Overlay Layer PT PT Results/Repairs Results/Repairs Repair Remarks

{WOL) No. Results Results/Repairs Exams 1831-1 RC- NRI NRI NRI The original axially- N/A N/A 12BR-C-5 oriented UT indication first observed during the 1988 outage was not observed during the 2016 (1 R27) outage. An embedded reflector in the original weld material was also noted. This indication was acceptable per ASME Section XI, Table IWB-3514-2.

NRI - No Recordable Indications E-1

Enclosure to NL-16-0421 Hatch Unit 1 Weld Overlay Examination Results and Repairs during the 1R27 Outages Weld Sacrificial Completed WOL Post-WOL Base Metal PT PDI UT Exam Overlay Layer PT PT Repair Remarks Results/Repairs Results/Repairs (WOL) No. Results Results/Repairs Exams 1831-1RC- Two linear PT indications NRI NRI The UT examination of N/A N/A 12BR-E-5 larger than the 1/16-inch the new WOL resulted in criteria per lSI Alternative six indications recorded.

15-01 were observed: (1) a Four fabrication flaws in 1-1 /8-inch linear indication the 52M weld overlay in the weld overlay remnant which had no measurable and (2) a %-inch linear through-wall and were indication in the dissimilar less than 3-inches in metal weld within 1/8-inch length. Also observed of the P3 ferritic material. was a fabrication flaw in Grinding was performed on the original Alloy 182 the indications but it did not nozzle buttering. These reduce the flaw lengths to five indications were an acceptable size. These acceptable per ASME PT indications are aligned Section XI, Table IWB-azimuthally with the 2006 3514-2. The original and 2016 UT indications. axially-oriented UT Resolution consisted of a indication first observed combined seal weld repair during the 1988 outage of shielded metal arc had advanced to the welding (SMAW) on the repaired area but did not weld overlay remnant and go into the 2016 weld gas tungsten arc welding overlay material. The UT (GTAW) on the dissimilar data for weld 1831-1 RC-metal weld surface 12BR-E-5 has been temperbead. PT was shared with EPRI NDE performed on 02-21 (after Center personnel for the 48-hour hold) with no further evaluation and recordable indications. review to support a future potential industry i

recommendation.

NRI - No Recordable Indications E-2

Enclosure to NL-16-0421 Hatch Unit 1 Weld Overlay Examination Results and Repairs during the 1R27 Outages Weld Overlay Base Metal PT Sacrificial Completed WOL Post-WOL Layer PT PT POl UT Exam (WOL) No. Results/Repairs Results/Repairs Repair Remarks Results Results/Repairs Exams 1E11-1 AHA- NRI NRI NRI The original axially- N/A N/A 24A-R-12-13 oriented UT indication on (NewWO L Weld 13 which was first covers both observed during the 1984 welds 12 and outage was not observed 13} during the 2016 (1 R27) outage. UT fabrication flaws were noted in the original weld 12 (Valve to Pipe) and the valve body 00 clad. These indications were acceptable per ASME Section XI, Table IWB-3514-2.

NRI- No Recordable Indications E-3

Charles R. Pierce Southern Nuclear Regulatory Affairs Director Operating Company, Inc.

40 Inverness Center Parkway Post Office Box 1295 Birmingham, AL 35242 Tel 205.992.7872 SOUTHERN * \

NUCLEAR Fax 205.992.7601 A SOUTHERN COMPANY MAR 1 7 2016 Docket Nos.: 50-321 NL-16-0421 U. S. Nuclea r Regulatory Commi ssion A TIN: Docum ent Control Desk Washington, D. C. 20555-0001 Edwin I. Hatch Nuclea r Plant- Unit 1 Full Structural Weld Overlays on Reacto r Recirculation and Residual Heat Removal System s Nondestructive Examination Result s- Spring 2016 Outage (1R27)

Ladies and Gentlemen:

By letter dated Decem ber 18, 2015, the Nuclea r Regula tory Commi ssion (NRC) approv ed the use of inservice inspection (lSI) Alternative HNP-ISI-ALT-1 5-01.

This Alternative allowed the installation of full structural weld overlay s (FSWOL) on four welds at Edwin I. Hatch Nuclea r Plant (HNP) Unit 1 during the spring 2016 refueling outage. Below is the lSI weld identification numbe r for each of the four welds:

  • 1E11-1 RHR-2 4A-R-1 3 The lSI Alternative stated (in part) that Southern Nuclea r Operating Compa ny (SNC) will provide the NRC, within 14 days after the completion of the ultrasonic examination of the weld overlay installations, (1) the examination results of the weld overlays, and (2) a discussion of any repairs to the overlay materia l and/or base metal and the reason for repair."

The nondestructive examination (NDE) was completed on March 6, 2016.

The attache d Table 1 docum ents the examination results and includes a description of any repairs and the reasons for the repairs. These NDE examination results suppor t the position that the weld overlays are acceptable for service The Alternative requires the lSI ultrasonic examination to be repeate d in either the 1 R28 or the 1R29 outage. This letter satisfies the 14-day examin ation reporting requirements.

U.S. Nuclear Regulatory Commission NL Page2 This letter contains no NRC commitments. If you have any questions, please contact Ken McElroy at (205) 992-7369.

Respectfully submitted,

c. -R. B>>

C. R. Pierce Regulatory Affairs Director CRP/RMJ

Enclosure:

Hatch Unit 1 Weld Overlay Examination Results and Repairs during the 1R27 Outage cc: Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Best, Executive Vice President & Chief Nuclear Officer Mr. D. R. Vineyard, Vice Preside nt- Hatch Mr. M. D. Meier, Vice Preside nt- Regulatory Affairs Mr. D. R. Madison, Vice Preside nt- Fleet Operations Mr. B. J. Adams, Vice Preside nt- Engineering Mr. G. L. Johnson, Regulatory Affairs Manager - Hatch RTYPE: CHA02.004 U.S. Nuclear Regulatory Commission Ms. C. Haney, Regional Administrator Mr. M. D. Orenak, NRR Project Manag er- Hatch Mr. D. H. Hardage, Senior Resident Inspect or- Hatch E-2

Edwin I. Hatch Nuclear Plant - Unit 1 Full Structural Weld Overlays on Reactor Recirculation and Residual Heat Removal Systems Nondestructive Examination Results - Spring 2016 Outage (1 R27)

Enclosure Hatch Unit 1 Weld Overlay Examination Results and Repairs during the 1R27 Outage

Enclosure to NL-16-0421 Hatch Unit 1 Weld Overlay Examination Results and Repairs during the 1R27 Outage Weld Sacrificial Completed WOL Base Metal PT POl UT Exam Post-WOL Overlay Layer PT PT Results/Repairs Results/Repairs Repair Remarks

{WOL) No. Results Results/Repairs Exams 1831-1 RC- NRI NRI NRI The original axially- N/A N/A 12BR-C-5 oriented UT indication first observed during the 1988 outage was not observed during the 2016 (1 R27) outage. An embedded reflector in the original weld material was also noted. This indication was acceptable per ASME Section XI, Table IWB-3514-2.

NRI - No Recordable Indications E-1

Enclosure to NL-16-0421 Hatch Unit 1 Weld Overlay Examination Results and Repairs during the 1R27 Outages Weld Sacrificial Completed WOL Post-WOL Base Metal PT PDI UT Exam Overlay Layer PT PT Repair Remarks Results/Repairs Results/Repairs (WOL) No. Results Results/Repairs Exams 1831-1RC- Two linear PT indications NRI NRI The UT examination of N/A N/A 12BR-E-5 larger than the 1/16-inch the new WOL resulted in criteria per lSI Alternative six indications recorded.

15-01 were observed: (1) a Four fabrication flaws in 1-1 /8-inch linear indication the 52M weld overlay in the weld overlay remnant which had no measurable and (2) a %-inch linear through-wall and were indication in the dissimilar less than 3-inches in metal weld within 1/8-inch length. Also observed of the P3 ferritic material. was a fabrication flaw in Grinding was performed on the original Alloy 182 the indications but it did not nozzle buttering. These reduce the flaw lengths to five indications were an acceptable size. These acceptable per ASME PT indications are aligned Section XI, Table IWB-azimuthally with the 2006 3514-2. The original and 2016 UT indications. axially-oriented UT Resolution consisted of a indication first observed combined seal weld repair during the 1988 outage of shielded metal arc had advanced to the welding (SMAW) on the repaired area but did not weld overlay remnant and go into the 2016 weld gas tungsten arc welding overlay material. The UT (GTAW) on the dissimilar data for weld 1831-1 RC-metal weld surface 12BR-E-5 has been temperbead. PT was shared with EPRI NDE performed on 02-21 (after Center personnel for the 48-hour hold) with no further evaluation and recordable indications. review to support a future potential industry i

recommendation.

NRI - No Recordable Indications E-2

Enclosure to NL-16-0421 Hatch Unit 1 Weld Overlay Examination Results and Repairs during the 1R27 Outages Weld Overlay Base Metal PT Sacrificial Completed WOL Post-WOL Layer PT PT POl UT Exam (WOL) No. Results/Repairs Results/Repairs Repair Remarks Results Results/Repairs Exams 1E11-1 AHA- NRI NRI NRI The original axially- N/A N/A 24A-R-12-13 oriented UT indication on (NewWO L Weld 13 which was first covers both observed during the 1984 welds 12 and outage was not observed 13} during the 2016 (1 R27) outage. UT fabrication flaws were noted in the original weld 12 (Valve to Pipe) and the valve body 00 clad. These indications were acceptable per ASME Section XI, Table IWB-3514-2.

NRI- No Recordable Indications E-3

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