NOC-AE-16003365, Additional Information for Review of the License Renewal Application - Aluminum Bronze AMP
| ML16132A246 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 05/04/2016 |
| From: | Gerry Powell South Texas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NOC-AE-16003365, TAC ME4936, TAC ME4937 | |
| Download: ML16132A246 (17) | |
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Nuclear Operating Company South Texas Project Electric Generating Station P.O. Box 28!J Wadsworth. Texas 77483 May 4, 2016 NOC-AE-16003365 10 CFR 54 File No. G25 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN 50-499 Additional Information for the Review of the South Texas Project, Units 1 and 2, License Renewal Application -Aluminum Bronze AMP (TAC Nos. ME4936 and ME4937)
References:
- 1. Letter; G. T. Powell to the NRG Document Control Desk; "License Renewal Application",
NOC-AE-10002607; dated October 25, 2010. (ML103010257)
- 2. "Summary of Public Meeting with STP to Discuss the Plant-Specific Aging Management Program, Selective Leaching of Aluminum Bronze, Associated with the STP License Renewal Application", dated February 8, 2016. (ML16033A007)
By Reference 1, STP Nuclear Operating Company (STPNOC) submitted a License Renewal Application (LRA). A public meeting was held with the NRG on January 19, 2016, to discuss STPNOC's Aging Management Program (AMP) for selective leaching of Aluminum Bronze. As summarized in Reference 2, STPNOC is providing an update to the License Renewal Application (LRA) Appendices A and B, to describe STPNOC's AMP for Selective Leaching of the Aluminum Bronze. Enclosure 1 to this letter provides the replacement LRA sections.
Regulatory commitment items 39 and 44 in LRA Table A4-1 have been replaced as provided in . There are no other commitments in this letter.
STI: 34306744
NOC-AE-16003365 Page 2 of 3 If there are any questions regarding this submittal, please contact Arden Aldridge, STP License Renewal Project Lead, at (361) 972-8243 or Rafael Gonzales, STP License Renewal Project regulatory point-of-contact, at (361) 972-4779.
I declare under penalty of perjury that the foregoing is true and correct.
Executed on ~1 -11 Zt?/4-Date G. T. Powell Executive Vice President and Chief Nuclear Officer rjg
Enclosures:
- 2. STPNOC Regulatory Commitments Replacement of Commitments 39 and 44
NOC-AE-16003365 Page 3 of 3 cc:
(paper copy) " (electronic copy)
Regional Administrator, Region IV Morgan. Lewis & Beckius LLP U.S. Nuclear Regulatory Commission Steve Frantz 1600 East Lamar Boulevard Arlington, TX 76011-4511 U.S. Nuclear Regulatory Commission Lisa M. Regner Lisa M. Regner Lois James Senior Project Manager U.S. Nuclear Regulatory Commission NRG South Texas LP One White Flint North (MS 8 G9A) Chris O'Hara 11555 Rockville Pike Jim van Suski!
Rockville, MD 20852 Skip Zahn NRC Resident Inspector CPS Energy U. S. Nuclear Regulatory Commission' Kevin Pollo P. 0. Box 289, Mail Code: MN116 Cris Eugster Wadsworth, TX 77483 L. D. Blaylock Lois James Crain Caton & James. P.C.
License Renewal Project Manager (Safety) Peter Nemeth One White Flint North (MS 011-F1)
U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 City of Austin Elaina Ball John Wester Tam Tran License Renewal Project Manager (Environmental) Texas Dept. of State Health Services One White Flint North (MS 011 F01) Helen Watkins U.S. Nuclear Regulatory Commission Robert Free Washington, DC 20555-0001
NOC-AE-16003365 Enclosure 1 STPNOC LRA AMP Replacement List of Replaced LRA Sections Affected LRA Section A1.37 82.1.37
NOC-AE-16003365 Enclosure 1 Page 1of9 A1.37 SELECTIVE LEACHING OF ALUMINUM BRONZE The Selective Leaching of Aluminum Bronze program manages loss of material and cracking due to selective leaching of aluminum bronze (copper alloy with greater than 8 percent aluminum) components and welds exposed to raw water within the scope of license renewal.
All aluminum bronze castings susceptible to selective leaching, including attachment welds related to the castings, and aluminum bronze root valves with adapter socket welds will be replaced prior to the period of extended operation with material that is not susceptible to selective leaching. Extruded piping tees with aluminum bronze weld repairs, where the repair size is such that failure of the repair would affect the structural integrity of the component, will be replaced prior to the period of extended operation.
STP uses copper alloy piping with less than 8 percent aluminum content, which is not susceptible to selective leaching. However, there are welds in which the filler metal is copper alloy with greater than 8 percent aluminum. The final composition of welds and process used to fabricate the welds results in a reduction in the susceptibility of the root pass filler material to selective leaching ..
The_ Selective Leaching of All.lm_irwm Bronze prograrn dire~ts that prior to the period of extended operation 3 percent with a maximum of 10 welds of the above ground weld population with no backing rings are examined one-time volumetrically to validate weld integrity. If rejectable weld flaws (weld defects) per ASME Section IX requirements are found during the one-time inspection of welds with no backing rings, periodic volumetric examinations of 20 percent with a maximum of 25 welds will be performed every 1O years thereafter.
The Selective Leaching of Aluminum Bronze program directs that 20 percent with a maximum of 25 welds of the above ground weld population with backing rings are examined volumetrically to validate weld integrity prior to the period of extended operation and every 10 years thereafter. If no weld defects are found during the 20 percent inspection performed prior to .the period of extended operation, the 10 year follow-up volumetric examinations will be reduced to 3 percent with a maximum of 10 welds.
Discovery of weld defects requires expansion of the volumetric examination sample population.
Each weld found with a defect requires five additional volumetric examinations to be performed until no additional weld defects are found.
Additionally, the aging management program directs that two welds with backing rings are destructively examined prior to the period of extended operation to verify the absence of selective leaching.
Yard walkdowns are performed in the areas above the buried piping with aluminum bronze welds to look for changes in ground conditions that would indicate leakage. If a leak from a buried pipe weld is discovered by surface water monitoring or during a buried ECW piping inspection, a section of each leaking piping weld will be removed for destructive examination.
Visual inspections are performed every six months (not to exceed nine months) of the external surfaces of the above ground welds for evidence of through wall leakage.
The acceptance criterion for volumetric examination of aluminum bronze welds is no defects.
The acceptance criterion for visual inspection of the aluminum bronze welds and adjacent copper alloy piping during the walkdowns is no through wall leakage.
NOC-AE-16003365 Enclosure 1 Page 2 of 9 Aluminum bronze welds found to have defects or through wall leakage are removed and destructively examined to determine the extent of cracks or selective leaching. The condition is documented in the corrective action program and a structural integrity analysis is performed to confirm that the load carrying capacity of the installed welds remain adequate to support the intended function of the ECW system through the period of extended operation.
NOC-AE-16003365 Enclosure 1 Page 3 of 9 82.1.37 Selective Leaching of Aluminum Bronze Program Description The Selective Leaching of Aluminum Bronze program manages loss of material and cracking due to selective leaching for aluminum bronze (copper alloy with greater than eight percent aluminum) components and welds exposed to raw water within the scope of license renewal.
The selective leaching of aluminum bronze is applied in addition to the Open-Cycle Cooling Water program (B2.1.9).
All aluminum bronze castings susceptible to selective leaching, including attachment welds related to the castings ~nd ~luminum bronze root valve ~dapter socket welds, will be replaced prior to the period of extended operation with material that is not susceptible to selective leaching. Extruded piping tees With aluminum bronze weld repairs, where the repair size is such that failure of the repair would affect the structural integrity of the component, will be replaced prior to the period of extended operation.
STP uses copper alloy piping with less than 8 percent aluminum content, which is not susceptible to selective leaching. However, there are welds in which the filler metal is copper alloy with greater than 8 percent aluminum. The final composition of welds and process used to fabricate the welds results in a reduction in the susceptibility of the root pass filler material to selective leaching.
The Selective Leaching of Aluminum Bronze program directs that prior to the period of extended operation 3 percent with a maximum of 10 welds of the above ground weld population with no backing rings are examined one:.time volumetrically to validate weld integrity. If rejectable weld flaws (weld defects) per ASME Section IX requirements are found during the one-time inspection of welds with no backing rings, periodic volumetric examinations of 20 percent with a maximum of 25 welds will be performed every 10 years thereafter.
The Selective Leaching of Aluminum Bronze program directs that 20 percent with a maximum of 25 welds of the above ground weld population with backing rings are examined volumetrically to validate weld integrity prior to the period of extended operation and every 10 years thereafter. If no weld defects are found during the 20 percent inspection performed prior to the period of extended operation, the 10 year follow-up volumetric examinations will be reduced to 3 percent with a maximum of 10 welds.
-Discovery of weld defects requires expansion of the volumetric examination sample population.
Each weld found with a defect requires five additional volumetric examinations to be performed until no additional weld defects are found.
Additionally, the aging management program directs that two welds with backing rings are destructively examined prior to the period of extended operation to verify the absence of selective leaching.
- Yard walkdowns are performed in areas above the buried piping with aluminum bronze welds to look for changes in ground conditions that would indicate leakage. If a leak from a buried pipe weld is discovered by surface water monitoring or during a buried ECW piping inspection, a section of each leaking piping weld will be removed for destructive examination. Visual inspections are performed every six months (not to exceed nine months) of the external surfaces of the above ground welds for evidence of through wall leakage.
NOC-AE-16003365 Enclosure 1 Page 4of9 The acceptance criterion for volumetric examination of aluminum bronze welds is no defects.
The acceptance criterion for visual inspection of the aluminum bronze welds and adjacent copper alloy piping during the walkdowns is no through wall leakage.
Aluminum bronze welds found to have defects or through wall leakage are removed and destructively examined to determine the extent of cracks or selective leaching. The condition is documented in the corrective action program and a structural integrity analysis is performed to confirm that the load carrying capacity of the installed welds remain adequate to support the intended function of the ECW system through the period of extended operation.
Aging Management Program Elements An evaluation of each element of the Aging Management Program against the 10 elements described in Appendix A of NUREG-1800, Standard Review Plan for Review of License Renewal Applications for Nuclear Power Plants, is provided below.
,,
Scope of Program (Element 1)
The Selective Leaching of Aluminum Bronze program manages loss of material and cracking due to selective leaching for aluminum bronze (copper alloy with greater than 8 percent aluminum) components and we.Ids exposed to raw water within the scope of license renewal.
Prior to the period of extended operation, all aluminum bronze castings susceptible to selective leaching, including attachment welds related to the castings and aluminum bronze root valves with adapter socket welds, will be replaced with material that is not susceptible to selective leaching.
Extruded piping tees with aluminum bronze weld repairs where the repair size is such that failure of the repair would affect the structural integrity of the component will be replaced prior to the period of extended operation.
STP uses copper alloy piping with less than 8 percent aluminum, which is not susceptible to selective leaching. However, welds in which the filler metal is copper alloy with greater than 8 percent aluminum may be susceptible to loss of material and cracking due to selective leaching.
The final composition of welds and process used to fabricate the welds results in a reduction in the susceptibility of the root pass filler material to selective leaching.
The following weld material is used.
- ERCuAl-A2 with no backing ring,
- ERCuNiAI with no backing ring,
- ERCuAl-A2 with backing ring, and
- ERCuAl-A2 non-cast component weld repairs.
Preventive Actions (Element 2)
The Selective Leaching of Aluminum Bronze program does not prevent degradation due to aging effects but provides for component replacement and inspections to detect aging degradation prior to the loss of intended functions.
NOC-AE-16003365 Enclosure 1 Page 5 of 9 Prior to the period of extended operation, all aluminum bronze castings susceptible to selective leaching, including attachment welds related to the castings and aluminum bronze root valves with adapter socket welds, will be replaced with material that is not susceptible to selective leaching.
Extruded piping tees with aluminum bronze weld repairs where the repair size is such that failure of the repair would affect the structural integrity of the component will be replaced prior to the period of extended operation.
Parameters Monitored or Inspected (Element 3)
The susceptibility of aluminum bronze welds is related to the integrity of the weld, the weld material composition, and the welding temperature controls.
Welds without backing rings are either original ERCuAl-A2 material or replacement ERCuNiAI material. The original ERCuAl-A2 welds without backing rings were radiographed at time of installation to detect the presence of weld flaws. The replacement ERCuNiAI welds without backing rings were examined visually and by liquid penetrant method at time of installation. The ERCuNiAI weld material is less susceptible to selective leaching than the ERCuAl-A2 weld material due to the addition of nickel.
Welds with backing rings are original ERCuAl-A2 material. The original ERCuAl-A2 welds with backing rings were examined visually and by use of liquid penetrant method at time of installation.
Operating experience has shown that ERCuAl-A2 welds without weld flaws, welds using ERCuNiAI weld material, and welds without backing rings are not susceptible to cracking caused by selective leaching.
The aging management program will verify the weld integrity of the above ground weld population with no backing rings by performing a one-time volumetric examination on 3 percent with a maximum of 10 welds prior to the period of extended operation. If rejectable weld flaws (weld defects) per ASME Section IX requirements are found during the one-time inspection of weld with no backing rings, periodic volumetric examinations of 20 percent with a maximum of 25 welds will be performed every 10 years thereafter.
The aging management program will verify the weld integrity of the above ground weld population with backing rings by performing periodic volumetric examinations on 20 percent with a maximum of 25 welds prior to the period of extended operation and every 10 years thereafter.
If no weld defects are found during the inspection performed prior to the period of extended operation of weld with backing rings, the follow up volumetric examinations will be reduced to 3 percent with a maximum of 10 welds.
Since the population of welds use similar material and are exposed to the same environment, the samples for volumetric examination will be randomly selected from the total population of above ground welds.
Two welds with backing rings will be destructively examined prior to the period of extended operation to verify the absence of selective leaching.
NOC-AE-16003365 Enclosure 1 Page 6 of 9 Aluminum bronze welds found to have defects or through wall leakage are removed and destructively examined to determine extent of cracks or selective leaching. The condition is documented in the corrective action program and a structural integrity analysis is performed to confirm that the load carrying capacity of the installed welds remain adequate to support the intended function of the ECW system through the period of extended operation.
Detection of Aging Effects (Element 4)
The Selective Leaching of Aluminum Bronze program includes a one-time and periodic volumetric examination of above ground aluminum bronze welds to determine if selective leaching or cracking is occurring.
1 The Selective Leaching of Aluminum Bronze program includes visual inspections every six months (not to exceed nine months) of the external surfaces of the above ground components and welds for evidence of through wall leakage.
Every six months, a walktjown is performed in the areas above the buried ECW piping containing copper alloy welds with aluminum content greater than 8 percent. During the walkdown, the ground is observed for conditions that would indicate leakage. If a leak from a below-grade piping weld is discovered by surface water monitoring, a section of each leaking piping weld will be removed for destructive examination.
Whenever aluminum bronze materials are exposed during inspection of the buried ECW piping, the components are examined for indications of selective leaching. If leaking below-grade
, welds are discovered during a buried ECW piping inspection, a section of each leaking weld will be removed for destructive examination.
Aluminum bronze welds found to have defects or through wall leakage are removed and destructively examined to determine extent of cracks or selective leaching.
Monitoring and Trending (Element 5)
This is an inspection program to determine if selective leaching is occurring and the degree of the selective leaching. No trending is performed.
Acceptance Criteria (Element 6)
The acceptance criterion for volumetric examination of aluminum bronze welds is no defects.
The acceptance criterion for visual inspection of the aluminum bronze welds and adjacent copper alloy piping during the walkdowns is no indication of through wall leakage.
If an acceptance criterion is not met, the condition is documented in the corrective action program and a structural integrity analysis is performed to confirm that the load carrying capacity of the tested material remains adequate to support the intended function of the ECW system through the period of extended operation.
NOC-AE-16003365 Enclosure 1 Page 7 of 9 Corrective Actions (Element 7)
Aluminum bronze welds found to have defects or through wall leakage are removed and destructively examined to determine the extent of cracks or selective leaching. The condition is documented in the corrective action program and a structural integrity analysis is performed to confirm that the load carrying capacity of the installed welds remain adequate to support the intended function of the ECW system through the period of extended operation.
Discovery of weld defects requires expansion of the volumetric examination sample population.
Each weld found with a defect requires five additional volumetric examinations to be performed until no additional weld defects are found.
If a leak from a buried pipe weld is discovered by surface water monitoring or during a buried ECW piping inspection, a section of each leaking piping weld will be removed for destructive examination.
When acceptance criteria are not met a determination of operability and an assessment of the extent of condition is performed.
STP QA procedures, review and approval process, and administrative controls are implemented in accordance with the requirements of 10 CFR 50 Appendix B and are acceptable in addressing corrective actions. The QA program includes elements of corrective action, and is applicable to the safety-related and nonsafety-related systems, structures, and components that are subject to aging management review.
Confirmation Process (Element 8)
STP QA procedures, review and approval process, and administrative controls are implemented in accordance with the requirements of 10 CFR 50 Appendix B and are acceptable in addressing confirmation processes and administrative controls. The QA program includes elements of corrective action, and is applicable to the safety-related and nonsafety-related systems, structures, and components that are subject to aging management review.
Administrative Controls (Element 9)
See Element 8.
Operating Experience (Element 10)
STP identified through-wall cracks in the ECW system piping which were initiated by pre-existing weld defects anp propagated by a dealloying phenomenon. The pre-existing weld defects identified appeared in welds with backing rings. The weld population consists of shop and field welds without backing rings, field welds with backing rings, weld repairs to extruded piping tees, and valves with adapter socket welds. Welds that have shown through-wall cracks have been welds with bacl<ing rings, weld repairs to extruded piping tees, and valves with adapter socket welds. Laboratory failure analysis data has indicated that in the cases with leaks, a preexisting crack penetrating into the central core of the weld was present. Poor fit-up may have contributed to such root pass cracking. Crack growth appears to have occurred by a process of the crack tip dealloying locally and the crack propagating through the dealloyed zone. The affected welds were repaired.
NOC-AE-16003365 Enclosure 1 Page 8 of 9 Selective leaching has occurred in susceptible aluminum bronze components. STP will replace all susceptible aluminum bronze components prior to the period of extended operation.
Enhancements Prior to the period of extended operation, the following enhancements will be implemented in the following program elements:
Scope of Program (Element 1) and Preventive Actions (Element 2)
Procedure will be enhanced to:
- Replace all aluminum bronze castings susceptible to selective leaching prior to the period of extended operation.
- Replace aluminum bronze root valve adapter socket welds with material that is not susceptible to selective leaching prior to the period of extended operation.
- Replace extruded piping tees with aluminum bronze weld repairs where the repair size is such that failure of the repair would affect the structural integrity of the component prior -
to the period of extended operation.
Parameters Monitored or Inspected (Element 3)
Procedure will be enhanced to:
- Verify, the weld integrity of the above ground weld population with no backing rings by performing a one-time volumetric examination on 3 percent with a maximum of 10 welds prior to the period of extended operation. ,
- Specify, if weld flaws are found during the one-time inspection of weld with no backing rings, periodic volumetric examinations of 20 percent with a maximum of 25 welds will be performed every 10 years thereafter.
- Verify, the weld integrity of the above ground weld population with backing rings by performing periodic volumetric examinations on 20 percent with a maximum of 25 welds prior to the period of extended operation and every 10 years thereafter.
- Specify, if no weld defects are found during the periodic inspection performed prior to the period of extended operation of weld with backing rings, the follow-up volumetric examinations will be reduced to 3 percent with a maximum of 10 welds.
- Specify, the samples for volumetric examination be randomly selected from the total population of above ground welds.
- Require, two welds with backing rings be destructively examined prior to the period of extended operation to verify the absence of selective leaching.
- Require, welds which are found to have defects or through wall leakage, be removed and destructively examined to determine the extent of cracks or selective leaching.
NOC-AE-16003365 Enclosure 1 Page 9 of 9
- Require, welds which are found to have defects or through wall leakage, be documented in the corrective action program and a structural integrity analysis be performed to confirm that the load carrying capacity of the installed welds remain adequate to support the intended function of the ECW system through the period of extended operation.
Detection of Aging Effects (Element 4)
Procedure will be enhanced to:
- Require one-time and periodic volumetric examination of above ground aluminum bronze welds to determine if selective leaching or cracking is occurring.
- Require welds which are found to have defects or through wall leakage, be removed and destructively examined to determine extent of cracks or selective leaching.
Acceptance Criteria (Element 6)
Procedure will be enhanced to:
- Specify, the acceptance criterion for volumetric examination of aluminum bronze welds is no defects. *
- Specify, the acceptance criterion for visual inspection of the aluminum bronze welds and adjacent copper alloy piping during the walkdowns is no through wall leakage.
- Require, the unacceptable inspections be documented in the corrective action program and a structural integrity analysis be performed_ to confirm that the load carrying capacity of the installed welds remain adequate to support the intended function of the ECW system through the period of extended operation.
Corrective Actions (Element 7)
Procedure will be enhanced to:
- Require, upon discovery of weld defects or through wall leakage, the welds are removed and destructively examined to determine extent of cracking or selective leaching.
- Require, weld defects or through wall leakage be documented in the corrective action program and a structural integrity analysis be performed to confirm that the load carrying capacity of the installed welds remain adequate to support the intended function of the ECW system through the period of extended operation.
- Specify, discovery of weld defects requires expansion of the volumetric examination sample population. Each weld found with a defect requires five additional volumetric examinations to be performed until no additional weld defects are found.
Conclusion The continued implementation of the Selective Leaching of Aluminum Bronze program provides reasonable assurance that aging effects will be managed such that the systems and components within the scope of this program will continue to perform their intended functions consistent with the current licensing basis for the period of extended operation.
NOC-AE-16003365 Enclosure 2 STPNOC Regulatory Commitments Replacement of Commitments 39 and 44
NOC-AE-16003365 Enclosure 2 Page 1 of 3 Table A4-1 License Renewal Commitments ltern # .. Commitment
- LRA *Implementation Sectio" Schedule
..
39 Enhance the Selective Leaching of Aluminum Bronze procedures to: 82.1.37 No later than the date the renewed
- Visually examine aluminum bronze materials expo.sed during inspection of the operating licenses buried essential cooling water piping for evidence of leakage, and are issued.
- If a leak from buried aluminum bronze welds is discovered by surface water monitoring or during a buried ECW piping inspection, a section of each leaking CR 11-28986 weld will be removed for destructive metallurgical examination.
44 The Selective Leaching of Aluminum Bronze program will: 82.1.37 Replacements and inspections to be
- Replace all aluminum bronze castings susceptible to selective leaching, complete no later including attachment welds related to the castings with material that is not than six months susceptible to selective leaching. prior to the PEO or
- Replace aluminum bronze root valve adapter socket welds with material that is the end of the last not susceptible to selective leaching. refueling outage prior to the PEO,
- Replace ext~uded piping tees with aluminum bronze weld repairs where the whichever occurs repair size is such that failure of the repair would affect the structural integrity later.
of the component.
-.
Procedure changes no later than the Enhance the-Selective Leaching of Aluminum Bronze procedure to: date the renewed operating licenses
rings by performing a one-time volumetric examination on 3 percent with a maximum of 10 welds prior to the period of extended operation.
CR 12-22150
NOC-AE-16003365 Enclosure 2 Page 2 of 3 Tab/eA4-1 License Renewal Commitments Item# Commitment . '
LRA Implementation
- ,'
, .. :section Schedule*.
I I
- Specify, if weld defects are found during the one-time inspection of welds with no backing rings, periodic volumetric examinations of 20 percent with a maximum of 25 welds will be performed every 10 years thereafter.
- Verify the weld integrity of the above ground weld population with backing rings by performing periodic volumetric examinations on 20 percent with a maximum of 25 welds prior to the period of extended operation and every 10 years thereafter.
- Specify, if no weld defects are found during the periodic inspection performed prior to the period of extended operation of welds with backing rings, the follow-up volumetric examinations will be reduced to 3 percent with a maximum
,' of 10 welds.
- Specify, the samples for volumetric examination be randomly selected from the total population of above ground welds.
- Require two welds with backing rings be destructively examined prior to the period of extended operation to verify the absence of selective leaching.
- Require welds which are found to have defects or through wall leakage, be removed and destructively examined to determine extent of cracking or selective leaching.
- Require welds which are found to have defects or through wall leakage, be documented in the corrective action program, and a structural integrity analysis be performed to confirm that the load carrying capacity of the installed welds remain adequate to support the intended function of the ECW system through the period of extended operation.
- Specify, the acceptance criterion for volumetric examination of aluminum bronze welds is no defects.
NOC-AE-16003365 Enclosure 2 Page 3 of 3 TableA4-1 License Renewal Commitments
- Item# *' *Commitment ,
' LRA lmplementati.On* "
' I
' ., *Section .Schedule* . . "