ML023600184
| ML023600184 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 12/16/2002 |
| From: | Rosalyn Jones Duke Energy Corp, Duke Power Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML023600184 (26) | |
Text
SDuke R.AJONES Powere Vice President A Duke Energy Company Duke Power 29672 / Oconee Nuclear Site 7800 Rochester Highway Seneca, SC 29672 864 885 3158 864 885 3564 fax December 16, 2002 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555
Subject:
Duke Energy Oconee Nuclear Station, Unit 1 Docket Nos. 50-269 Third Ten Year Inservice Inspection Interval Requests for Alternative/Relief No.02-009 and 02-010 Pursuant to 10 CFR 50.55a(g) (5) (iii), attached are a Request for Alternative and a Request for Relief associated with repairs made to the Unit 1 Condenser Circulating Water (CCW) Pump "IB" between March and June of 2000. During similar repairs on another CCW pump, questions were raised as to weld qualifications, and it was determined that discrepancies existed during the work on "1B". These requests are submitted by Duke Power (Duke) in order to resolve these discrepancies.
The effective code for the Oconee Repair-Replacement Program is ASME Section XI 1989 (no Addenda), which requires that repairs be performed in accordance with the original construction code of the component or system.
This pump was not originally designed, procured, or constructed to any code or QA standard. The Oconee CCW pumps were upgraded from non-QA to QA-I (pressure boundary only) as a part of the Oconee Service Water Project in 1998. As part of the upgrade, Duke committed to maintain the pumps as QA-1 equipment for all future maintenance.
The CCW system construction code was USAS B31.1.0, 1967.
Therefore this code was selected as the construction code to be used for the repair activity since no original component construction code exists.
Request for Alternative 02-009 addresses the fact that the welders were qualified on plate rather than pipe, which does not meet the requirements of USAS B31.1.0, 1967, U. S.
www duke-energy comr
Nuclear Regulatory Commission December 16, 2002 Page 2 Section 127.5.4 paragraph (a). The proposed alternative is to apply a provision of ASME Section IX, which allows such qualifications when the pipe diameter is large. Approval is requested pursuant to 10 CFR 50.55a(a) (3) (i) because the alternative provides an acceptable level of quality and safety.
Request for Relief 02-010 addresses the fact that the welders were qualified to weld in the "IG" (flat) position only. It is now believed that some fillet welds were performed in the horizontal rather than flat position.
Approval is requested pursuant to 10 CFR 50.55a (a) (3)
(ii) because the extensive effort that would be necessary to remove the pump from service, remove the previous weld repairs, perform NDE, and remake the weld repairs would constitute a significant hardship without a compensating increase in the level of quality and safety.
If there are any questions or further information is needed you may contact R. P. Todd at (864) 885-3418.
Ver uly yours, S VeJones Site Vice President Attachment
U. S. Nuclear Regulatory Commission December 16, 2002 Page 3 xc w/att: L. A. Reyes, Regional Administrator U.S. Nuclear Regulatory Commission, Region II Atlanta Federal Center 61 Forsyth St., SWW, Suite 23T85 Atlanta, GA 30303 L. N. Olshan, Project Manager, Section 1 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555-0001 xc(w/o attch):
M. C. Shannon Senior NRC Resident Inspector Oconee Nuclear Station Mr. Virgil Autrey Division of Radioactive Waste Management Bureau of Land and Waste Management SC Dept. of Health & Environmental Control 2600 Bull St.
Columbia, SC 29201
Duke Energy Corporation Oconee Nuclear Station, Unit 1 Request for Relief No. 2002-09 I. System/Component for Which Relief is Requested:
Oconee Condenser Circulating Water (CCW) Pump "lB" (Equipment Number ONICCWPU0002, ISI Class C)
There are 12 CCW pumps at Oconee or 4 per unit. These pumps are single stage vertical pumps which take their suction directly out of Lake Keowee. Their normal function is to provide cooling for the plant by pumping lake water through the condenser. This water is also used as cooling water for various loads throughout the plant. They also provide flow via a siphoning effect during certain design basis events, including fire, LOCA, LOOP, and LOCA/LOOP.
The pumps were not originally designed, procured, or constructed to any code or QA standard. The Oconee CCW pumps were upgraded from non-QA to QA-I (pressure boundary only) as a part of the Oconee Service Water Project in 1998. As part of the upgrade, Duke committed to maintain the pumps as QA-1 equipment for all future maintenance.
In March 2000 the "lB" CCW pump was removed from the system for a routine refurbishment. The pump was shipped to a vendor shop for this work. The planned work concentrated on inspecting the pump, replacing worn parts, rebuilding the pump, and coating the pump. During the inspection, needed weld repairs were identified. These weld repairs were completed along with other refurbishment work. The pump was returned to service in June 2000.
During work on a subsequent pump ("3D") performed in March of 2001, the ANII raised issues with code compliance. These issues were immediately addressed on the "3D" pump. It was also decided to investigate whether the same issues applied to the previously completed "IB" pump. This document requests relief from certain code requirements as a result of this investigation. See also Duke Energy Corporation Request for Relief No. 02-10.
1
Request for Relief No. 2002-09 II. Code Requirement:
The lB CCW pump was not originally built to any construction code. When it was reclassified to QA-I by Duke, it was also placed within the scope of ASME Section XI which provides requirements for Repair Replacement Activities. The effective code for the Oconee Repair Replacement Program is ASME Section XI 1989 (no Addenda).
Subparagraph IWA-4120 (a) states "Repairs shall be performed in accordance with the Owner's Design Specification and the original construction code of the component or system". The CCW system construction code was USAS B31.1.0, 1967. This system construction code was selected as the construction code to be used for this repair-replacement activity since no original component construction code exists.
USAS B31.1.0, 1967 Subsection 127.5.1 states, "Qualification of the welding procedures to be used, and of the performance of welders and welding operators, is required, and shall comply with the requirements of ASME Boiler and Pressure Vessel Code (Section IX) except as modified by this Par. 127.5."
Paragraph 127.5 then has several modifications. The modification relevant to this submittal is Section 127.5.4 paragraph (a) which states, "Test joints for both procedure qualification and performance qualification shall be made as groove welds in pipe in one or more of the specified basic qualification test positions."
III. Code Requirement for Which Relief is Requested The vendor's welders were qualified to Section IX requirements, but were qualified on plate rather than pipe, which does not meet the requirements of USAS B31.1.0, 1967, Section 127.5.4 paragraph (a). Therefore, a request for an alternative to the requirement of USAS B31.1.0, 1967, Section 127.5.4 (a) to qualify welders on pipe is requested by this submittal. The proposed alternative to this B31.1.0 requirement is a requirement of ASME Section IX.
IV. Basis for Relief The alternative provides an acceptable level of quality and safety pursuant to 10 CFR 50.55a(a) (3) (i).
1
Request for Relief No. 2002-09 V. Alternate Examinations or Testing No other additional examinations or tests are planned.
VI. Justification for the Granting of Relief The vendor's welders were qualified to ASME Section IX. The qualification test was groove welding on plate in the IG (flat) position.Section IX, Table QW-461.9 provides the position and diameter limitations for performance qualification. According to this table, qualification using groove welding on plate in the flat position also qualifies the welder for groove welding on pipe over 24 inches O.D.
in the flat position and fillet welding on plate and pipe in the flat position.Section IX recognizes that for large diameter piping, the welding is similar to welding on plate. All the welds repaired were groove welds on the CCW pump diameter which varies from approximately 65 inches to approximately 96 inches or fillet welds. Therefore, due to the large diameter of the CCW pumps, the welder qualification meetsSection IX and is an acceptable alternative to the requirements of B31.1.0, 1967. Reference for a complete list of the pressure boundary weld joints repaired.
There are additional items that also support the reasonable assurance of structural integrity:
"* The welder qualification requirements of ASME Section IX were met.
" NDE was performed on all weld repairs. This included visual examinations of all weld repairs and magnetic particle exams on some specific welds. This supports the acceptable quality of the current welds.!
" The pump was pressure tested with air after installation. The pump passed this inspection with no leaks noted. It was tested again using this same method approximately 4 months later with no leaks noted.1
" The pump has operated successfully for over 2 years since the refurbishment work was performed.
2
Request for Relief No. 2002-09 Tech Spec 3.7.8 requires verification of the siphon header every 18 months. Verification is via a flow test of the header in the siphon mode per Surveillance Requirement 3.7.8.9. This test has been completed successfully two times since the pump was refurbished.
3
Request for Relief No. 2002-09 Attachment 1 WELDER AND WELD FILLER MATERIAL RECORD SHEET Sales Order 01711760 Information relating to the table below:
- 1. Welds described as combination groove and fillet - these are welds that are fillet on the ID or OD of the pump, and the other side of the weld is a groove weld.
- 2. Pressure retaining: If the column indicates "Y" the weld is on a pressure retaining component. If the column indicates "Y ATT" the weld is on an attachment to a pressure retaining component, such as a bearing housing strut or a vane in the diffuser. Non pressure boundary welds are not included in this list.
- 3. NDE column indicates the method of inspection following completion of the weld repair.
- 4. Welds on flange faces and flange registers were performed to restore the alignment and fit specifications between the major pump parts.
Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 1 Impeller Groove & Y VT&MT 94076 E14597-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Housing Fillet 2 Impeller Groove & Y VT 94076 E14597-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Housing Fillet Lower Impeller Y VT 94076 E14597-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 end Housing register Upper Impeller Y VT 94076 E14597-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 end Housing register Upper Impeller Y VT T-14 E14597-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 end Housing register_
1 Impeller Groove & Y VT&MT T-14 E14597-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Housing Fillet 2 Impeller Groove & Y VT T-14 E14597-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Housing Fillet 4
Request for Relief No. 2002-09 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 3 Impeller Groove Y VT 94076 E14597-02 CSI-6 QOO-725 5/32" E7018H4R Housing 19 Diffuser Groove N VT 94076 Z7384 CSI-1 Rev. QOO-725 5/32" E7018H4R 15 20 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-I Rev. QOO-725 5/32" E7018H4R 15 24 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-I Rev. QOO-725 5/32" E7018H4R 15 25 Diffuser Fillet Y Att VT 94076 Z7384 CSI-I Rev. Q00-725 5/32" E7018H4R 15 26 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-l Rev. QOO-725 5/32" E7018H4R 15 20 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-1 Rev. QOO-725 5/320 E7018H4R 15 21 Diffuser Fillet Y Att VT 94076 Z7384 CSI-l Rev. QOO-725 5/32" E7018H4R 15 22 Diffuser Fillet Y Att VT 94076 Z7384 CSI-I Rev. QOO-725 5/32" E7018H4R 15 23 Diffuser Fillet Y Att VT 94076 Z7384 CSI-l Rev. QOO-725 5/32" E7018H4R 15 24 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-l Rev. QOO-725 5/32" E7018H4R 15 25 Diffuser Fillet Y Att VT 94076 Z7384 CSI-I Rev. QOO-725 5/32" E7018H4R 15 26 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-1 Rev. QOO-725 5/32" E7018H4R 15 27 Diffuser Fillet Y Att VT 94076 Z7384 CSI-l Rev. QOO-725 5/32" E7018H4R 15 1 Increaser Groove & Y VT 940976 E14596-02 CSI-I Rev. QOO-725 5/32" E7018H4R Column Fillet 15 2 Increaser Fillet Y VT 940976 E14596-02 CSI-1 Rev. QOO-725 5/32" E7018H4R Column 15 3 Increaser Groove Y VT 940976 E14596-02 CSI-I Rev. QOO-725 5/32" E7018H4R Column 15 4 Increaser Groove Y VT 940976 E14596-02 CSI-I Rev. QOO-725 5/32" E7018H4R Column 15 5 Increaser Groove Y VT 940976 E14596-02 CSI-l Rev. QOO-725 5/32" E7018H4R Column 15 5
Request for Relief No. 2002-09 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 6 Increaser Fillet Y Att VT 940976 E14596-02 CSI-l Rev. Q00-725 5/32" E7018H4R Column 15 7 Increaser Fillet Y Att VT 940976 E14596-02 CSI-l Rev. Q00-725 5/32" E7018H4R Column 15 8 Increaser Fillet Y Att VT 940976 E14596-02 CSI-l Rev. Q00-725 5/32" E7018H4R Column 15 9 Increaser Fillet Y Att VT 940976 E14596-02 CSI-l Rev. Q00-725 5/32" E7018H4R Column 15 1 Increaser Groove & Y VT T14 E14596-02 CSI-l Rev. Q00-725 5/32" E7018H4R Column Fillet 15 2 Increaser Fillet Y VT T14 E14596-02 CSI-l Rev. Q00-725 5/32" E7018H4R Column 15 3 Increaser Groove Y VT T14 E14596-02 CSI-l Rev. QOO-725 5/32" E7018H4R Column 15 4 Increaser Groove Y VT T14 E14596-02 CSI-l Rev. QOO-725 5/32" E7018H4R Column 15 5 Increaser Groove Y VT T14 E14596-02 CSI-l Rev. Q00-725 5/32" E7018H4R Column 15 10 Increaser Fillet Y Att VT T14 E14596-02 CSI-l Rev. QOO-725 5/32" E7018H4R Column 15 11 Increaser Fillet Y Att VT T14 E14596-02 CSI-l Rev. Q00-725 5/32" E7018H4R Column 15 12 Increaser Fillet Y Att VT T14 E14596-02 CSI-l Rev. QOO-725 5/32" E7018H4R Column 15 13 Increaser Fillet Y Att VT T14 E14596-02 CSI-1 Rev. QOO-725 5/32" E7018H4R Column 15 Register Increaser Y VT T14 E14596-02 CSI-I Rev. QOO-726 .035" ER70S-2 B Column 15 Register Increaser Y VT T14 E14596-02 CSI-I Rev. QOO-726 .035" ER70S-2 A Column 15 Top Support Y VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 flange Column Bottom Support Y VT T14 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 flange Column OD Support Y VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 register Column Bore Support Y VT T14 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Column 6
Request for Relief No. 2002-09 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID Top Support Y VT 94076 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 flange Column Bottom Support Y VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 flange Column I OD Support Y VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 register Column Bore Support Y VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 Support Groove Y VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 2 Support Fillet Y VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 3 Support Fillet Y VT & MT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 12 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2
_Column 13 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 14 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 15 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 16 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 17 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 18 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 19 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 20 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 21 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2
_Column 22 Support Fillet Y Att VT & MT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 1 23 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column I I I I I I I 7
Request for Relief No. 2002-09 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 24 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 25 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 26 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Column 27 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 28 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 29 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 30 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 31 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 32 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 33 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 34 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Column 1 35 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 36 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 37 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 38 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 39 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 40 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 41 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 42 Support Fillet Y Att VT TI4 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column I I I II__
8
Request for Relief No. 2002-09 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 43 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 Support Groove Y VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 2 Support Fillet Y VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 3 Support Fillet Y VT & MT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 12 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 13 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 14 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 15 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 16 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 17 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 18 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 19 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 20 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Column 21 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 22 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 23 Support Fillet Y Att VT & MT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 24 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 25 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 26 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column I I I 9
Request for Relief No. 2002-09 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 27 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 28 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2
_Column 29 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 30 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 31 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2
,Column 32 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 33 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 34 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 35 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 36 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 37 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 38 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 39 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 40 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 41 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 42 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 43 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 31 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R Support 15 32 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R Support 15 10
Request for Relief No. 2002-09 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 33 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. Q00-724 1/8" E7018H4R Support 15 34 Motor Fillet Y Att VT 94076 E14606 CS-i Rev. Q00-724 1/8" E7018H4R Support 15 35 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R Support 15 36 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. Q00-724 1/8" E7018H4R Support 15 37 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R Support 15 38 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R Support 15 39 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. Q00-724 1/8" E7018H4R Support 15 40 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R
_Support 1 1 15 11
Duke Energy Corporation Oconee Nuclear Station, Unit 1 Request for Relief No. 2002-10 I. System/Component for Which Relief is Requested:
Oconee Condenser Circulating Water (CCW) Pump "IB" (Equipment Number ONICCWPU0002, ISI Class C)
There are 12 CCW pumps at Oconee or 4 per unit. These pumps are single stage vertical pumps which take their suction directly out of Lake Keowee. Their normal function is to provide cooling. This water is also used as cooling water for various loads throughout the plant. They also provide flow via a siphoning effect during certain design basis events, including fire, LOCA, LOOP, and LOCA/LOOP.
The pumps were not originally designed, procured, or constructed to any code or QA standard. The Oconee CCW pumps were upgraded from non-QA to QA-I (pressure boundary only) as a part of the Oconee Service Water Project in 1998. As part of the upgrade, Duke committed to maintain the pumps as QA-I equipment for all future maintenance.
In March 2000 the "lB" CCW pump was removed from the system for a routine refurbishment. The pump was shipped to a vendor shop for this work. The planned work concentrated on inspecting the pump, replacing worn parts, rebuilding the pump, and coating the pump. During the inspection, needed weld repairs were identified. These weld repairs were completed along with other refurbishment work. The pump was returned to service in June 2000.
During work on a subsequent pump ("3D") performed in March of 2001, the ANII raised issues with code compliance. These issues were immediately addressed on the "3D" pump. It was also decided to investigate whether the same issues applied to the previously completed "IB" pump. This document requests relief from certain code requirements as a result of this investigation. See also Duke Energy Corporation Request for Relief No. 02-09.
1
Request for Relief No. 2002-10 II. Code Requirement:
The lB CCW pump was not originally built to any construction code. When it was reclassified to QA-l by Duke, it was also placed within the scope of ASME Section XI which provides requirements for Repair Replacement Activities. The effective code for the Oconee Repair Replacement Program is ASME Section XI 1989 (no Addenda).
Subparagraph IWA-4120 (a) states "Repairs shall be performed in accordance with the Owner's Design Specification and the original construction code of the component or system". The CCW system construction code was USAS B31.1.0, 1967. This system construction code was selected as the construction code to be used for this repair-replacement activity since no original component construction code exists.
USAS B31.1.0, 1967 Subsection 127.5.1 states, "Qualification of the welding procedures to be used, and of the performance of welders and welding operators, is required, and shall comply with the requirements of ASME Boiler and Pressure Vessel Code (Section IX) except as modified by this Par. 127.5."
Paragraph 127.5 then has several modifications. The modification relevant to this submittal is Section 127.5.4 paragraph (c) which states, in part, "Qualifications in Position 1G qualifies for welds in that position only."
II. Code Requirement for Which Relief is Requested Vendor welders were qualified to weld in the "IG" (flat) position. Welders were witnessed performing welds out of the welder's qualified position on the "3D" CCW pump (welds were witnessed being performed in the horizontal rather than flat position). These were removed and rewelded. Based on a review of the pump parts, some fillet weld repairs on the "IB" pump could not have been positioned to perform the repair in a true flat position due to the geometry of the part. Based on this, it is concluded that some fillet welds were performed out of position. Relief from the requirements of USAS B31.1.0, 1967, Section 127.5.4 (c) is requested by this submittal.
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Request for Relief No. 2002-10 IV. Basis for Reliefý Complying with the code requirement would result in hardship or unusual difficulty without a compensating increase in quality or safety pursuant to 10 CFR 50.55a (a)
(3) (ii).
V. Alternate Examinations or Testing No other additional examinations or tests are planned.
VI. Justification for the Granting of Relief Out of position welding was not actually witnessed by the ANII or Duke Energy on the lB CCW pump refurbishment.
However, experience on the 3D CCW pump refurbishment and examination of the lB CCW pump parts indicate that some of the lB CCW pump parts requiring fillet welds were welded out of position. Since we can not verify which welds were actually made out of position, we are conservatively considering all fillet weld repairs as being made out of position (horizontal rather than flat). Although this is a technical non-compliance with the welder qualification, welding in this position is allowed by the code and there is no indication that the welds themselves are defective.
Considering that the pumps were originally designed and fabricated without Quality Assurance or code requirements, the conservative decision in 1998 to apply QA and code requirements to the pumps for future pump maintenance assures that the quality and safety of the pumps always exceeds the original requirements.
The majority of the pump is located below lake level, requiring pump removal for inspections and repairs other than those which could be performed by underwater divers.
The size of this pump, the equipment required to lift the pump out of the intake structure, and the number of hours to remove the previous weld repairs, remake the weld repairs, and perform NDE would result in a significant hardship. There would be no compensating increase in the level of quality and safety because the QA requirements for these pumps have been increased over original requirements.
Reference Attachment 1 for a complete list of the pressure boundary weld joints repaired.
There are additional items that also support the reasonable 3
Request for Relief No. 2002-10 assurance of structural integrity:
" NDE was performed on all weld repairs. This included visual examinations of all weld repairs and magnetic particle exams on some specific welds. This supports the acceptable quality of the current welds.
" As noted on the attached Welder and Weld Filler Material Record Sheet (attachment 1), the majority of the fillet welds are attachment welds connecting pump bearing supports or diffuser vanes to the pressure retaining boundary component rather than welds which directly comprise the pressure retaining boundary.
" The pump was pressure tested with air after installation. The pump passed this inspection with no leaks noted. It was tested again using this same method approximately 4 months later with no leaks noted.
"* The pump has operated successfully for over 2 years since the refurbishment work was performed.
" Tech Spec 3.7.8 requires verification of the siphon header every 18 months. Verification is via a flow test of the header in the siphon mode per Surveillance Requirement 3.7.8.9. This test has been completely successfully two times since the pump was refurbished.
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Request for Relief No. 2002-10 Attachment 1 WELDER AND WELD FILLER MATERIAL RECORD SHEET (Fillet Welds Only)
Sales Order 01711760 Information relating to the table below:
- 1. Welds described as combination groove and fillet - these are welds that are fillet on the ID or OD of the pump, and the other side of the weld is a groove weld.
- 2. Pressure retaining: If the column indicates "Y" the weld is on a pressure retaining component. If the column indicates "Y ATT" the weld is on an attachment to a pressure retaining component, such as a bearing housing strut or a vane in the diffuser. Non pressure boundary welds are not included in this list.
- 3. NDE column indicates the method of inspection following completion of the weld repair.
Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 1 Impeller Groove & Y VT&MT 94076 E14597-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Housing Fillet 2 Impeller Groove & f VT 94076 E14597-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Housing Fillet 1 Impeller Groove & Y VT&MT T-14 E14597-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Housing Fillet 2 Impeller Groove & Y VT T-14 E14597-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Housing Fillet 20 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-I Rev. QOO-725 5/32" E7018H4R 15 24 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-I Rev. QOO-725 5/32" E7018H4R 1_ 15 25 Diffuser Fillet Y Att VT 94076 Z7384 CSI-I Rev. QOO-725 5/32" E7018H4R 15 26 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-I Rev. QOO-725 5/32" E7018H4R 15 20 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-I Rev. QOO-725 5/32" E7018H4R 15 21 Diffuser Fillet Y Att VT 94076 Z7384 CSI-I Rev. QOO-725 5/32" E7018H4R 1_ _15 1_ 1 5
Request for Relief No. 2002-10 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 22 Diffuser Fillet Y Att VT 94076 Z7384 CSI-l Rev. Q00-725 5/32" E7018H4R 15 23 Diffuser Fillet Y Att VT 94076 Z7384 CSI-1 Rev. QOO-725 5/32" E7018H4R 15 24 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-l Rev. QOO-725 5/32" E7018H4R 15 25 Diffuser Fillet Y Att VT 94076 Z7384 CSI-1 Rev. QOO-725 5/32" E7018H4R 15 26 Diffuser Fillet Y Att VT&MT 94076 Z7384 CSI-l Rev. QOO-725 5/32" E7018H4R 15 27 Diffuser Fillet Y Att VT 94076 Z7384 CSI-1 Rev. QOO-725 5/32" E7018H4R 15 1 Increaser Groove & Y VT 940976 E14596-02 CSI-1 Rev. QOO-725 5/32" E7018H4R Column Fillet 15 2 Increaser Fillet Y VT 940976 E14596-02 CSI-I Rev. QOO-725 5/32" E7018H4R Column 15 6 Increaser Fillet Y Att VT 940976 E14596-02 CSI-I Rev. QOO-725 5/32" E7018H4R Column 15 7 Increaser Fillet Y Att VT 940976 E14596-02 CSI-1 Rev. QOO-725 5/32" E7018H4R Column 1 15 8 Increaser Fillet Y Att VT 940976 E14596-02 CSI-I Rev. QOO-725 5/32" E7018H4R Column 15 9 Increaser Fillet Y Att VT 940976 E14596-02 CSI-1 Rev. QOO-725 5/32" E7018H4R Column 15 1 Increaser Groove & Y VT T14 E14596-02 CSI-I Rev. QOO-725 5/32" E7018H4R Column Fillet 15 2 Increaser Fillet Y VT T14 E14596-02 CSI-I Rev. QOO-725 5/32" E7018H4R Column 15 10 Increaser Fillet Y Att VT T14 E14596-02 CSI-1 Rev. QOO-725 5/32" E7018H4R Column 15 11 Increaser Fillet Y Att VT T14 E14596-02 CSI-I Rev. QOO-725 5/32" E7018H4R Column 15 12 Increaser Fillet Y Att VT T14 E14596-02 CSI-1 Rev. QOO-725 5/32" E7018H4R Column 15 13 Increaser Fillet Y Att VT T14 E14596-02 CSI-I Rev. QOO-725 5/32" E7018H4R Column 15 2 Support Fillet Y VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column I _ I 6
Request for Relief No. 2002-10 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 3 Support Fillet Y VT & MT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 12 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 13 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 14 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 15 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 16 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 17 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 18 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 19 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 20 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 21 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 22 Support Fillet Y Att VT & MT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 23 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 24 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 25 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 26 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 27 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 28 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 29 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 7
Request for Relief No. 2002-10 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 30 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 31 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 32 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2
_ Column 33 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 34 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 35 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 36 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 37 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 38 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 39 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Column 40 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 41 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 42 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 43 Support Fillet Y Att VT T14 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 2 Support Fillet Y VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 3 Support Fillet Y VT & MT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 12 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 13 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 14 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 8
Request for Relief No. 2002-10 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 15 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 16 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Column 17 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 18 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 19 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 20 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 21 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 22 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 23 Support Fillet Y Att VT & MT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 24 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 25 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 26 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 27 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 28 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 1 29 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 30 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 31 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 32 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 Q0O-726 .035" ER70S-2 Column 33 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column I I I I II 9
Request for Relief No. 2002-10 Weld Part Name Weld Type Pressure NDE Welder Drawing Weld Weld Filler Material & Size Joint Retaining ID Procedure ID 34 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 35 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 36 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Column 37 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Column 38 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Column 39 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 Q00-726 .035" ER70S-2 Column 40 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER7OS-2 Column 41 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 42 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 43 Support Fillet Y Att VT 94076 E14589-02 CS-4 Rev. 0 QOO-726 .035" ER70S-2 Column 31 Motor Fillet Y Att VT 94076 E14606 CS-l Rev. QOO-724 1/8" E7018H4R Support 15 32 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R Support 1 15 33 Motor Fillet Y Att VT 94076 E14606 CS-l Rev. QOO-724 1/8" E7018H4R Support 15 34 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R Support 15 35 Motor Fillet Y Att VT 94076 E14606 CS-l Rev. QOO-724 1/8" E7018H4R Support 15 36 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R Support 15 37 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R Support 15 38 Motor Fillet Y Att VT 94076 E14606 CS-l Rev. QOO-724 1/8" E7018H4R Support 15 39 Motor Fillet Y Att VT 94076 E14606 CS-I Rev. QOO-724 1/8" E7018H4R Support 1 1 15 1 ---- I 10
Request for Relief No. 2002-10 11