ML19305D965
| ML19305D965 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/11/1980 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML19305D962 | List: |
| References | |
| NUDOCS 8004170031 | |
| Download: ML19305D965 (8) | |
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ENCLOSURE SEQUOYAh NUCLEAR PLANT UNIT 1 PRESSURIZER RELIEF PIPING SUPPORT NCR SWP 79-S-8 10 CFR 50.55(e)
SUPPLEMENTAL INFORMATION TVA agreed to perform certain tests to verify the adequacy of draw bead welding on the Sequoyah Nuclear Plant (SNP) unit 1 pressurizer relief valve line during a meeting with the NRC staff in Bethesda, Maryland, on March 13, 1980. The testing wa.9 witnessed by NRC-0IE Inspectors P. K. Van Doorn and L. Zajac. The results of the tests are:
a.
Inplace Metallography - Inplace metallography was performed on the draw bead alignment welds used on the 6-inch, schedule 160, 316 stainless steel pressurizer relief pipe.
Grain size was extremely small and no evidence of sensitization was detected. Attachment 1 documents results of this examination.
In order to document TVA's metallographic technique and to prove the ability to detect sensi-tization in austenitic stainless steel, an identical examination was performed on the prototype weld which had previously been shown by ASTM A262, Practice A, to be sensitized.
The results of this test are documented in Attachment 2 and substantiate the acceptability of TVA's inplace metallographic technique.
Based on the results of inplace metallography (which showed a lack of sensitization), UT thickness measurements of the pipe in this area, and depth of weld groove, TVA has concluded that the weld heat affected zone (HAZ) does not encroach on the pipe inside diameter (id).
Consequently, the pipe id could not be sensitized.
b.
Radiography of Weld Draw Beads - Original ANSI B31.7, Class 1 radiographs were reviewed. They showed no evidence of through-wall penetration. Welds were again radiographed following surface conditioning to remove weld ripples using a 15-to 16-inch source to film distance, an Iridium-192 source, and an ASTM No. 12 penetrameter. The 2T hole was clearly visible.
Mr. Van Doorn and TVA Level III film interpreters reviewed the radiograph and found no evidence of weld through-wall penetration.
c.
Documentation Proving As-Received Material Had Been Solution Annealed Material certification for 6-inch, schedule 160 pressurizer relief valve line is shown as Attachment 3.
This certification documents that the material had been received in the solution-annealed condition.
In summary, TVA has demonstrated by testing that the weld HAZ is not sensitized and that it does not encroach on the pipe id.
TVA has'also documented the fact that the material used in the pressurizer relief valve line was received in the solution annealed. condition.
The use of the draw bead weld technique has in no way compromised the safety of the Sequoyah Nuclear Plant unit 1.
8 0.04170 03l l
ATTACHMENT 1 SEQUOYAh NUCLEAR PLANT UNIT 1 PRESSURIZER RELItF PIPE - INPLACE METALL0 GRAPHIC EVALUATION OF DREW BEAD ALIGNMENT TECHNIQUE In situ metallography to evaluate the heat-affected zones (HAZ) of the draw bead alignment welds on the outside diameter (od) of the 6-inch, schedule 160, 316 stainless steel pressurizer relief pipe were conducted on March 17, 1980.
The metallography was performed by TVA employees and witnessed by HRC-0IE Inspectors P. K. Van Doorn and L. D. Zajac.
Six areas were evaluated. These areas included both HAZ's of the base metal between the two weld beads at the 180-degree position (center of intact region of pipe is 0 degree reference) and both HAZ's of each weld at approximately 115 degrees. Etching was performed electrolyti-cally with 10 percent oxalic acid, as specified by ASTM A 262, Practice A, except that the optimum etching time was established at 2 minutes and 15 seconds. Microscopic observations of the etched HAZ's were made with a portable Unicron microscope at magnifications ranging from 50 to 400X.
Observations of each of the six HAZ locations were similar. No distinct sensitized zone was found.
In fact, only subtle differences existed in the region adjacent to the weld fusion line and the base metal.
Both of these regions exhibited a dominant step structure. Occasionally, a single discontinuously ditched grain boundary could be found in the region approximately 1/8 inch from the fusion line.
In all six areas examined, the microstructures, including both HAZ and base metal, met the acceptance criteria of ASTM A 262, Practice A.
A photomicrograph typical of the observed microstructure is attached.
The differences in the degree of od sensitization observed in the metallography of this report and a previous report concerning the 304 mockup can be explained by three factors:
(1) lower carbon content of the actual pipe material, (2) the much smaller grain size of the actual pipe material, and (3) the use of 316 stainless steel for the actual pipe ratner than 304.
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ATTAChET
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D ATTACICIENT 2 SEQUOYAH NUCLEAR PLANT UNIT 1 METALL0 GRAPHIC EVALUATION OF 304 STAINLESS STEEL MOCKUP OF PRESSURIZER RELIEF PIPE USING IN SITU TECHNIQUES In order to validate the tecnnique used to perform in situ metallo-graphy on the outside (od) diameter of the draw bead alignment welds of the 6-inch, schedule 160, 316 stainless steel pressurizer relief pipe, the identical technique was performed on a 304 stainless steel mockup.
Since the 304 mockup had been extensively evaluated in the laboratory and sensitization was found in the heat-affected zone (HAZ), it served as a standard by which the technique could be judged.
Identical features as found in the previous laboratory analysis were exhibited in this study (solution annealing adjacent to the fusion line followed by a zone of sensitization, then unaffected base metal), see figures la, lb, and Ic.
Although the inplace metallography was not of the quality of laboratory prepared samples, the structure was by no means obscured by a polishing artifact.
This study supports the conclusions of the in situ metallography performed on the od of the 316 pressurizer pipe. No distinctive zones of sensitization were present in the HAZ of the alignment welds.
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