ML20064E483
| ML20064E483 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 03/06/1994 |
| From: | Jonathan Brown, Froehlich C AFFILIATION NOT ASSIGNED |
| To: | |
| Shared Package | |
| ML18059A868 | List: |
| References | |
| 0054-00101-001, 54-101-1, NUDOCS 9403140319 | |
| Download: ML20064E483 (6) | |
Text
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ATTACHMENT 4 Consumers Power Company Palisades Plant Docket 50-255 ASME SECTION XI REPAIR PROGRAM March 6, 1994 i
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9403140319 940306
-PDR ADOCK 05000255 P
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V 0054-00101 001-100 Revision 0 54,00103.003.300 VECTRA Page 1 of 6 i
ASME SECTION XI REPAIR PROGRAM WELD OVERLAY REPAIRS TO AUSTENITIC STAINLESS STEEL PIPlNG WELDMENTS AND COMPONENTS PALISADES NUCLEAR PLANT 1.0 REPAIR PROGRAM SCOPE The purpose of this Repair Program is to define the methods and process controls for implementation of weld overlay repairs (WORs) on the Engineering Safeguard System (ESS; Safety injection, Containment Spray and Shutdown Cooling Systems) piping check valves at the Consumers Power Company Palisades Nuclear Plant.
2.0 REPAIR PROGRAM DETAILS 2.1 Acolicable Code The scope of work oddressed by this Repair Program shall meet the requirements of American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC)Section XI (Reference 1). In addition, the weld overlay repairs shall comply with the requirements of ASME Code Case N-504-1 (Reference 2).
2.2 Oriainal Construction Code The piping between the containment sump and the HPSI, LPSI and Containment Spray pumps was originally constructed in accordance with ASA B31.1-1955 and applicable code cases (Reference 3) and the requirements of the 6eference 4 Piping Class Sheet.
2.3 Gurrent Construction Code or purposes of inservice inspection (ISI), the ESS is considered an ASME Class 2 system. Consequently, welding repair work addressed by this Repair Program shall be performed in accordance with ASME BPVC
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0054-00101-001-100 Revision 0 0054.00101.001.100 VECTRA Page 2 of 6 Section XI (Reference 1). Welder / welding operator and welding procedure qualification shall be in accordance with ASME BPVC Section IX (Reference 5) and filler metal procurement in accordance with ASME BPVC Section II (Reference 6). Nondestructive examination (NDE) and testing work to be performed in support of this Repair Program shall be performed in accordance with ASME BPVC Sections V and XI (References 7 and 1).
2.4 Flaw and NDE Description inspection of check valves CK-ES3166 and CK-ES3181, which are part of the Safety Injection, Containment Spray and Shutdown Cooling System piping, identified flaws in the check velve body downstream of the valve-to-fitting circumferential weld joint. An accumulation of boron crystals at the 12 o' clock position on CK-ES3166 was identified during walkdown by plant personnel. A fluid-filled linear indication was observed at this location. Metallurgical evaluation of replicas taken at the ieakage area surface suggests that the flaw is the result of intergranular corrosion (IGC).
Physical evidence and a records search indicate that the valve bodies were weld repaired in the past, presumably by the valve supplier.
2.5 Elaw Removal Methgd For the surfaces to be overlay repaired, flaws leaking or open to the surface shall be locally seal welded prior to application of the WOR. All other indications shall also be seal welded as necessary to provide a defect-free surface. Alternatively, a " sacrificial" seal layer may be used to seal these latter indications.
2.6 Work Description As described in Code Case N-504-1 the WOR technique consists of applying weld metal over defects in austenitic stainless steel piping for a specified minimum distance beyond the observed flaws on both sides.
Multiple layers of delta ferrite containing weld metal are applied completely around the outside surface of the pipe. The machine Gas Tungsten Arc Wolding (GTAW) process will be the primary method (as supplemented by manual GTAW and Ghielded Metal Arc Weld ISMAW] processes) used to apply the overlays. The system will remain flooded with water to provide cooling of the pipe during welding.
T 0054-001 c1 -001 100 Revision 0 0054.00101.001.100 VECTRA Page 3 of 6 2.7 WOR Desian The specific WOR design geometry for each affected valve body has been designed by VECTRA Technologies, Inc. per the requirements of ASME Section XI (Reference 8), and Code Case N-504-1.
2.8 Acolicable Work Reauirements Work Order packages shall be developed for use in implementation of the workscope addressed by this Repair Program. These packages will, as a minimum, establish requirements for the following:
1.
General overlay welding details, 2.
Welding procedure specification qualification, 3.
\\" elder and welding operator qualification, 4.
Welding filler material, 5.
Overlay layout, 6.
Welding instructions and techniques, 7.
Defect and steam blow-out repair, 8.
Final surface condition, 9.
in-process and final NDE and measurement, 10.
Examination personnel qualifications, and 11.
Documentation.
This scope of work is exempt from postweld heat treatment.
V 0054-00101-001-100 Revision 0 0054.00101.001.100 VECTRA Page 4 of 6 2.9 Pressure Tests in accordance with Code Case N-504-1, completed overlays shall be pressure tested in accordance with ASME BPVC Section XI (Reference 1),
Paragraph IWA-5000. Overlays applied over flaws that completely penetrate the pressure boundary shall be hydrostatically tested while overlays over indications that do not penetrate the pressure boundary shall receive a system leakage, inservice, or functional test.
2.10 Renair Life The WORs are designed as a permanent repair (Reference 9).
2.11 ASME Code Symbol Stamoina Code symbol stamping is not required for the scope of work addressed by this Repair Program.
2.12 Documentation The repairs addressed by this Repair Program shall be documented by Consumers Power on Form NIS-2, " Owner's Report of Repair or Replacement", or equivalent form. The following records will be permanently maintained by Palisades Nuclear Plant:
1.
Certified Material Test Reports (CMTRs) for filler materials, 2.
Welding procedure specifications and procedure qualification
- records, 3.
Welder and welding operator qualification reccrds, 4.
NDE procedures and personnel qualification records, 5.
NDE reports,
V 0054-00101-001-100 Revision 0 0054.00101.001.100 VECTRA Page 5 of 6 6.
ASME Section XI Repair Program (this document),
7.
WOR design report / design calculation package, 8.
WOR data sheets, 9.
Welding operator log sheets, 10.
Process control travelers, 11.
Equipment calibration records, and 12.
Weld overlay repair application and examination procedures.
3.0 REFERENCES
1.
American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC)Section XI, " Rules for inservice Inspection of Nuclear Power Plant Components",1983 Edition, Summer 1983 Addenda.
2.
ASME BPVC Code Case N-504-1, " Alternative Rules for Repair of Class 1, 2, and 3 Austenitic Stainless Steel Piping - Section XI, Division 1", approved August 9,1993.
3.
Palisades Nuclear Plant Final Safety Analysis Report (FSAR), Volume 3, Chapter 6, Enaineered Safeauards System and Table 5.2-3, Mechanical System /Comoonent Classification 4.
Piping Class Sheets, Class HC, Drawings 5935-M 260 Sheet 1/HC, Rev. 23, 8-M 260 Sheet 1/HC, Rev. A, 5935-M-260 Sheet 2/HC, Rev.14, M260 Sheet 2A/HC, Rev.10, M260 Sheet 2B/HC, Rev.1, and 8-M260 Sheet 2B/HC, Rev. A.
5.
ASME BPVC Section IX, " Qualification Standard for Welding and Brazing Procedures, Welders, Brazers, and Welding and Brazing Operators", latest Edition in force at time of qualification.
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0054-00101-001-100 Revision 0 0054,00101.001 100 VECTRA Page 6 of 6 6.
ASME BPVC Section 11, " Material Specifications", Part C, " Welding Rods, Electrodes, and Filler Metals", latest Edition in force at time of manufacture.
7.
ASME BPVC Section V, " Nondestructive Examination,1983 Edition with Summer 1983 Addenda.
8.
ASME BPVC Section XI,1983 Edition with Winter 1985 Addenda or later Editions and Addenda.
9.
Letter PJG 94 *001 from P. J. Gire to R. B. Jenkins dated 2/26/94.
Prepared by:
O-//C s/4 / 9+
James A. Brown, P.E.
Date Checked by:
Ab'2edAd s s4-Carl H. Froehlich, P.E.
Date 1
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