ML20099B140
| ML20099B140 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 04/23/1973 |
| From: | Whitesell D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Henderson J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20099A192 | List: |
| References | |
| FOIA-96-207 NUDOCS 8004150650 | |
| Download: ML20099B140 (2) | |
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UNITED STATES
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APR 2 3 '973 Homo to Files Chief, Construction Branch, R0 THRU:
J. B. Henderson, BABCOCK & WILCOX (B&W) N PORT NO. BAW-1402 DTD 1/73 INCOMPLETE DOCUMENTATION OF WELD METAL USED IN REPA STEAM GENERATORS he subject report was reviewed and evaluated by TAB:RO and i
The report evaluates the " carbon equiv-Technical Review, L.
alent" of the weld metal with unknown mechanical properties s
with the known strengths of materials with the same " carbon De " carbon equivalent" is calculated by weld-equivalent". ability formulas that permit considerable variation in chem-istry, and is more a measure of crack ausceptibility of the alloy composition rather than the strength of materials.
Experience has demonstrated that the tensile and impact p However, conditions of welding or heat minimum requirements.
treatment of the 11018-M material could produce variations in tensile values; therefore, B&W was requested to perform com-parati'.e hardness tests across representative veld repairs which were made with 11018-M matarial for correlation with material strength based on carbon equivalents.
The results of such tests were provided by phone by Mr. J. F.
Mallay on April 11, 1973. The test was conducted on a test weld using 11018-M material, subsequently heat treated in a i
manner consistent with the heat treatment for the steam gen-erators, and was measured to Rockwell hardness A Scale (60 kgf). The results were:
1/4 point Base Metal 44, 45, 45, 46 HAZ 46, 46, 46, 46 Weld Metal 54, 54, 55, 54, 54 1/2 point Base aetal 46, 46, 46, 46 l
HAZ 46, 46, 46, 46 Weld Metal 55, 55, 55, 55, 55 The chemistry of the 11018-M material with unknown tensile and the requirements of SFA-5.5 lI (N
impact strengths was found to meet
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(AWS-A5.5 replaces ASTM A316).
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2-mes Based on the co:sparative analysis of materini with known properties and those of cortsin unknown properties, further supported by the hardness costs of the coro sensitivo 11018-M meterisi, we conclude that thera is renconable assuranco that the suspect asterials vill have acceptable tensile and impset j
properties.
On those bases we believe that cho wold repairs of the steam generators diocussed in the report are acceptable for their intended service, and have no further questions concerning this matter.
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D. E. tlhitosell Senior nocctor inspection Spoeia110t Construction Eranch
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Directorate of Roguintory Operations l
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