ML20236N508
Text
{{#Wiki_filter:_ _ _ _ - _ - _ - - _ _ _ _ - - - - . _ _ _ - - _ - - _ . _ - _ _ _ r From: Timothy Kobetzj AM To: EJL, CJH, SFS, FCS, PLE, AGH1, TWD2.TWPO'EMH1, RWP. . . [ M A //MG Dates 1/8/98 1:54pm /
Subject:
EPRI is helping the VSC-24 Owners Group FYI, I spoke to each utility in the VSC-24 Owners Group yesterday. They told me , they have solicited the assistance of EPRI in performing the feasibility assessment for UT of the MSB closure weld. EPRI will be observing the process and providing periodic reports to the Owners Group. Apparently,.EPRI has a '
~ lot of experience / expertise with flaw implementation. The Owners Group stated that they solicited the help from EPRI to add some " credibility" to the work they are doing. I would agree that this is a positive initiative.
For Welc' Team Members, the Owners Group is contracting West Moreland in PA to perform the metallurgical testing for them. Apparently, it has been difficult to find a company qualified to perform a J1C test and West Moreland will have to qualify to perform the test. We can explore this with them next Wednesday. I tentatively set up a telcon with the Owners Group to tell them where we are at and ask any questions we have at that time. I'll discuss this more at our meeting on Tuesday. Tim l. L 9907150152 900630 I ecuart _
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VSC-24 OWNERS GROUP WELDING GUIDELINES FOR MSB MATERIAL TOUGHNESS TESTING
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The welding guidelines to provide specimens for Charpy V-notch impact tests and l ASTM E-1737-96 material toughness tests were as follows: Test assembly plate base material (supplied by Wisconsin Electric)- A516- { 70,1" thick, same heat used by all ! Welding process (es) - test assemblies for each welding process (i.e., ( FCAW, GMAW, SMAW, as applicable) used during lid welding at each site l Weld length - 48" total weld length required for each weld process (24" of ( weld length from each welding process submitted to the NRC for testing) ) Welding parameters - control heat input such that the original lid welding procedure maximum heat input qualification value is maintained within i 10% Preheat - ambient minimum (e.g., 50*F), not the recently instituted 200*F elevated preheat or 1 hour pot;t-welding preheat maintenance Test assembly plate orientation - plates should lie in the same plane Welding position - 1G (flat) I' Weld joint - 55' groove, 45' bevel on one plate and 10' bevel on the other Other - remaining parameters and requirements of the respective approved lid welding procedure are to be followed MATERIALTEST SPECIMEN PREPARATION The materials used in the preparation of samples for material toughness testing are listed on the attached table. To limit variables, the same base material was used for l_ each specimen. This base metal met the specification requirements for base metal used u in the loaded casks, although it was not taken from any site's actual cask fabrication. The weld material had lower nominal hydrogen content than was necessarily used in
. fabrication of the previously loaded casks at Palisades and ANO, because there was none of the previously used welding comsumable material avaliable. The same material as used for previous welds at Point Beach was utilizadon the specimens.
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The specimens were welded in all cases using the same processes and procedures as
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were applied in making previous welds, in particular, the 200'F preheat and one hour postweld prehest maintenance proposed for future welds was not applied. Assessment of soolicability of results l The lower hydrogen weld materials could produce slightly better toughness in the as i L deposited case, compared to the original weld material. However, the original weld L material was not high hydrogen material, but was moderate. As reported in the SNC l resonse to NRC CAL 97-7-001, weld wire used at ANO showed an average diffusible l hydrogen level of 15.5 ml/H2/STP/100g. Samples of the weld wire used at Palisades showed a level of 15.0 to 15.9 and Point Beach wire showed a level of 9.0 i ml/H2 /STP/100g. The toughness effects of this difference is expected to be small.
- Therefore the results from the material test program as applied to acceptance criteria development are expected to be representative of the previously loaded casks at O' F.
l For future cask loadings, a revised procedure which incorporates a preheat of 200* F and one hour postweld preheat maintenance will be used. This preheat and postweld j ' heating process is expected to have very significant positive effects on material toughness. Consequently, the results from the material testing program are expected to . be conservative compared with similar results which could be achieved following such a ) process.
- Additional information regarding preparation of samples for material toughness testing is presented in the following table.
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SITE WELDING ' WELDING WELDING PREHEAT NOTES PROCEDURE PROCESS WlRE/ (Actual) ELECTRODES ANO E-P1 F(S,M)-A1-CVN FCAW E71T-1 Ambient 1 Rev.1 .045" dia. E-P1-A-A1-CVN-1 SMAW E70181 Ambient 2 Rev.1 3/32" dia Palisades FC-LID, Rev. 4 FCAW E71T-1 Ambient 1
.045" dia.
SM-LID, Rev. 2 SMAW E70181 Ambient 2 3/32" dia. E7018-1 Ambient 3 1/8" dia. Point WP-18, Rev.1 GMAW E70C-6 Ambient 4 Beach 1/16" dia. WP-17, Rev.1 SMAW E7018-1 Ambient 4 3/32" dia. l NOTES: ! 1 FCAW welding wire used was "new" lower hydrogen wire due to supply of wire used for previous cask loading lid welding being exhausted. New wire was procured with l supplemental diffusible hydrogen tests performed and certified to H8, where "8"is the j hydrogen value not to exceed in H2 Per 100g of deposited weld metal. Commitment to j use lower hydrogen level welding comsumables (less than 10 ml/H2/STP/100g) as i additional protection against hydrogen induced cracking during future cask loading I contained in SNC response to NRC CAL g7-7 001, ANO response to NRC CAL 97 002 and Consumers Energy Palisades response to NRC CAL 97-7-003. 2- SMAW electrodes not from the same Lot / Heat used for previous cask loading lid l welding, however AWS Class E70181 electrodes are considered " low hydrogen". These electrodes were purchased to the same specifications as the original electrodes. 3 SMAW electrodes from the same Lot / Heat used for previous cask loading lid welding. 4 GMAW welding wire and SMAW electrodes were from the same Lot / Heat used for cask loading lid welding on WMSBs - 01 and - 03 at Point Beach. i Page 3 of 3 l
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