ML20236M146
| ML20236M146 | |
| Person / Time | |
|---|---|
| Issue date: | 03/03/1998 |
| From: | Howe A NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Doctor S Battelle Memorial Institute, PACIFIC NORTHWEST NATION |
| Shared Package | |
| ML20236K829 | List:
|
| References | |
| FOIA-98-188 NUDOCS 9807130313 | |
| Download: ML20236M146 (2) | |
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From: Allen Howe, a m r r To: Intemet:pnl. gov:sr doctor,intemet:inel. gov:mta2...
Date: 3/3/98 5:44pm
Subject:
UT Issues - Questions Sorry this took so long. I walked out of the call and found out I was invited to brief management on weld issues. Please get me comments ASAP as I now need to call them anyway. Thanks-Allen Proposed questions: !
UT *near field" effects The structural-lid weld examination technique, as currently described (a 10Mhz,0.5 in. diameter transducer) would result in examination of the weld volume that was well within the neaFfield range of the equipment. It is known in the UT indust:y that the characteristics of sound waves in the near-field range are not well-behaved and that it is more difficult to obtain reliable and ,
repeatable results from near-field examinations. From ASNT Volume 7, page 831, Second '
Edition - Examinations within the near field and test may not be reliable. Examinations within this range will need a high level of control on equipment and process to produce a reliable test.
While UT examination in the near field is possible, it is not clear what measures have been ,
taken to address UT examination in the near-field regime to assure reliable and repeatable l examination results. The owners group should be prepared to address concems with the near-field effects during the inspection.
Transducer size The size of the transducer and the resultant sound beam cross sectional area is much greater than most of the flaws that are being sized. It is known that better accuracy in flaw sizing is obtained with UT equipment that produces a sound beam cross sectional area at the flaw location that is the minimum practicable. The owners group should be prepared to address concems with the flaw sizing accuracy of the equipment selected for this UT examination technique.
Examination Procedure Is the owners group adopting one examination method that will be uniformly implemented at the three sites or are licensee specific techniques planned?
Schedule 1
is March 16 still a valid inspection date?
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Mall Envelope info:
(34FC87B1.A46 : 17 : 42080)
Subject:
U1 issues Ouestions Croation Date: 3/3/98 5:44pm From: Allen Howe Created By: WND1.WNP7:AGH1 Recipients Action Date & Time Post Office intemet mta2 Post OMice inte' met sr_ doctor l
Post Office TWD2.TWP0 DAJ1 CC (DeDorah Jackson) l Post Office WND1.WNP7 Delivered 05/29/98 02:53pm AGH1 (Allen Howe)
CKB1 (Charles (Ken)Battige) ,l l
Domain. Post Office Delivered Route intemet Pending Intemet:inal. gov Intemet Pending intemet:pnl. gov TWD2.TWP0 Pending TWD2.TWP0 WND1.WNP7 05/29/98 02:53pm WND1.WNP7 Files Size Date & Time MESSAGE 1950 03/03/98 05:44pm View - 4109 03/03/9812:44pm Options Auto Delete: No Expiration Date: None Notify Recipients: No Priority: Normal Reply Requested: No Return Notification:: None Concealed
Subject:
No Security: Normal To Be Delivered: Immediate Status Tracking: Allinformation l
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