ML19221A860

Reg Guide 1.31,Revision 3, Control of Ferrite Content in Stainless Steel Weld Metal

ML19221A860
Person / Time
Issue date:	04/30/1978
From:	NRC OFFICE OF STANDARDS DEVELOPMENT
To:
References
REGGD-01.031, REGGD-1.031, NUDOCS 7907100138
Download: ML19221A860 (5)

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Revision 3 p ara w %,,

,9 U.S. NUCLEAR REGULATORY COMMISSION April 1978

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OFFICE OF STANDARDS DEVELOPMENT REGULATORY GUIDE 1.31 CONTROL OF FERRITE CONTENT IN STA!NLESS STEEL WELD METAL A. INTRODUCTION presence of nuerofiwures. Further insestigations re-lated the presence of the microfiwures to the low General Design Criterion I, " Quality StanJard' delta ferrite content of the deposited weld metai.

and Record,

of Appendix A.

" General Design Since microfissures in austenitie welds may hase an Criter a for Nuclear Power Plants, ' to 10 CFR Part i

adserse elfect on the integrits of components, the 50 requires that components important to safety be ontrol of weld deposits 'o c$isure the riresence of l designed, fabricated, erected, and tested to qualit) delta ferrite in these welds is adsisable.

standards commensurate with the importance of the As part of achiesine this control, recommendations saf ety tunction to be performed. Criterion 14. "Reae-to test production welds were made in the original e

tor Coolant Prewure lloundary, ' of Appendis A re-sersion of this guide (Safety Guide 31. " Control of quires that the reactor coolant pressure boundary be Stainless Steel Weldine'), and these reconunenda-designed, fabricated, erected, and tested so as to hase tions were retained in Ikesision 1. lierause licensees an estremely low probability of abnormal leakage, of and other representatises of the nuclear mdustrs be-

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rapidly propagating failure, and of pross rupture. Ap-liesed that adequate control of filler metal ferrite con-pendis 11 " Quality Awurance Criteria for Nuclear tent would consistently proside sound weld deposits Power Plants an; Fuel Processing Plants, ' to 10 CFR with an absence of microfiwures, a cooperatis e study Part 50 requires that a quality assurance program be group was formed by ASME, ANSI, and NRC to in-applied to the design, construction, and operation of sestigate the problem and the alternatises that would structures, systems, and components. Appendis 11 ensure adequate control of ferrite content. The studv

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also requires that measures be established to ensure group analped data from welds prepared by eight that special processes, including welding, are con ~

different procedures. About 1500 test results were trolled and accomplished by qualified personnel analved, and recommendations were made to both using qualified procedures and that proper process agdli and NRC on how testing of production welds monitormg be performed.

could be reduced without sacrifice of ferrite content This guide describes a method acceptable to the control. ReviCon 2 and this Resision 3 are based on NRC staff for implementing these requirements with those recommc ndations. At present, the ASMii regard to the control of welding in fabricating and Code

• prosisions incorporated bs reference into the joining safety-related austenitic stainless steel com-NRC regulations require compliailce with one of two ponents and systems in light-w ater-cooled nuclear alternatne methods for control of delta ferrite in weld power plants. The Adsisory Committee on Reactor metal filler materi:.!s: either a chemical analy sis Safeguards has been consulted cencerning this guide method or a magnetic measurement method. The and has concurred in the regulatory position.

NRC staff does not consider either method adequate B. DISCUSSION inspection of some welds in austenitic stain!ess winter to AJJenJa, secnon 111 -suclear Power l'iant steel components of nuclear reJetors has rescaled the Co m oner,i Asul. Hoder anJ Preuure Vewel Code. Copies may be obtained f rom the Americ an Society of Methanh al i n-pneers, l'nited f.ngneering Center.145 I ast 4?ih Street, New

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