ML17326A080
| ML17326A080 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/09/1999 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML17326A079 | List: |
| References | |
| NUDOCS 9908120098 | |
| Download: ML17326A080 (5) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2055&4001 SAFETY EVALUATIONBY THE OFFICE OF NUCLEAR REACTOR REGULATION USE OF ASME SECTION IX CODE CASES 2142-1 AND 2143-1 INDIANAMICHIGANPOWER COMPANY DONALDC. COOK NUCLEAR PLANT DOCKET NO. 50-315
1.0 INTRODUCTION
By letter dated April 3, 1998, Indiana Michigan Power Company (IM, the licensee), requested approval under the provisions of 10 CFR 50.55a(a)(3) to use the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (Code),Section IX, Code Cases 2142-1 and 2143-1 for the fabrication and installation of Donald C. Cook Nuclear Plant, Unit 1, replacement steam generator lower assemblies.'hese two Code Cases classify nickel-base weld metals that closely match'and are intended for welding Alloy690. Code Case 2142-1 establishes welding classifications and other requirements for a bare wire fillermetal.
Code Case 2143-1 establishes welding classifications and other requirements for a coated electrode.
The subject Code Cases are nonnuclear Code Cases and are not reviewed and approved generically for incorporation into the NRC Regulatory Guides; therefore, they may not be used by licensees without prior specific NRC staff review and approval.
2.0 EVALUATION Code Case 2142-1 lists the Unified Numbering System (UNS) designation (UNS N06052) for a weld fillermetal commercially known as "INCO 52," conforming to the American Welding Society (AWS) Specification A5.14. It establishes the F-No. of this weld metal as F-No. 43 for both procedure and performance qualification purposes.
Code Case 2143-1 lists appropriate AWS and UNS specifications conforming to AWS Specification A5.11 for a coated electrode commercially known as "INCO 152" and establishes F-No. 43 for this material for welding purposes.
By this set of specifications and F-No. assignments, these materials are completely described for welding purposes as similar in their welding characteristics to many other Code nickel-base weld metals.
Thus, these two weld metals are exempted from the requirements for
'Although 10 CFR 50.55a references only the applicable portions of Sections III and XI of the ASME Boiler and Pressure Vessel Code, ASME Section III requires in NB-2400 that all welding material used in the construction and repair of ASME Code Class 1 components and material conform to the requirements for other welding material as permitted in Section IX.
9908120098 990809 PDR ADQCK 050003i5 P
specific procedure and performance qualifications for non-Code materials, which willpermit the licensee to use a large number of existing welding procedures and performance qualifications, eliminating any additional difficultyor hardship associated with separate procedures for non-Code welding materials, which would have no compensating increase in level of quality or
- safety.
Therefore, this willpermit the licensee to use a large number of welding procedures and performance qualifications previously qualified for F-No. 43 materials.
This would eliminate the hardship associated with performing additional separate procedure qualifications which would be without any compensating increase in the level of quality and safety.
'ndustry studies and service experience have found these materials to have superior corrosion resistance when compared to Alloy600 material in current use.
The subject. weld consumables are preferred for welding applications involving Alloy690 in order to match the corrosion resistance of the Alloy690 base metal, thereby providing an acceptable level of quality and safety because of the superior corrosion resistance.
The staff has previously reviewed and approved the use of Code Cases 2142-1 and 2143-1 in Byron Station, Unit 1, and Braidwood Station, Unit 1.
3.0 CONCLUSION
The staff concludes that the use of the subject weld metals is acceptable as a substitute for other weld metals when the licensee has determined that their use could enhance the safety of the steam generator lower assemblies.
Additionally, the staff finds that the Code Cases appropriately identify and classify these same two weld metals for welding purposes, thereby eliminating the burden that would be imposed by the requirement for special procedure and performance qualifications for non-Code materials.
The staff finds that imposition of additional procedure and performance qualiTications would not result in any increase in quality or safety.
The staff has reviewed the licensee's request and supporting information and concludes that the use of the subject Code Cases as an alternative to the ASME Code,Section IX, requirements willprovide an acceptable level of quality and safety and is authorized pursuant to 10 CFR 50.55a(a)(3)(i).
Principal Contributors:
H. Conrad (by precedent)
F. Lyon Date:
August 9, 1999
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DISTRIBUTION:
'ocket File PUBLIC PD31r/f JZwoiinski/S Black OGC J. Stang F. Lyon ACRS G. Grant, Rill K. Wichman H. Conrad
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