ML20236M171

Provides Summary of Position on Issue Re Grinding Weld Crown on MSB mock-up to Facilitate UT Exam from Structural Lid (Top) Side of MSB

ML20236M171
Person / Time
Site:	07201007
Issue date:	02/24/1998
From:	Howe A NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
To:	Doctor S Battelle Memorial Institute, PACIFIC NORTHWEST NATION
Shared Package
ML20236K829	List: IA-98-188, Informs That NMSS May Have Workable Solution Plan Re VSC-24 UT Insp.Will Keep People Informed of Schedule & Progress ML20236K827 ML20236K848 ML20236K869 ML20236K875 ML20236K893 ML20236K930 ML20236K953 ML20236L060 ML20236M140 ML20236M146 ML20236M155 ML20236M159 ML20236M171 ML20236M185 ML20236M192 ML20236N077 ML20236N213 ML20236N253 ML20236N276 ML20236N316 ML20236N344 ML20236N366 ML20236N375 ML20236N388 ML20236N420 ML20236N482 ML20236N503 ML20236N508 ML20236N521 ML20236N527 ML20236N548 ML20236N589 ML20236N600 ML20236N605 ML20236N612 NUREG/CR-5985, Provides Summary of NUREG/CR-5985,PNL-8919,Supplement 1, Review of P-scan Computer Based Ultrasonic ISI Sys
References
FOIA-98-188 NUDOCS 9807130325
Download: ML20236M171 (2)

Text

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d-

'b From:

Allen Howe, AM 'J

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To:

Intemet:pnl. gov:sr doctor,intemet:inel. gov:mta2...

Dete:

2/24/98 5:46pm

Subject:

More on Grinding the Weld Crown Tim Kobotz and i discussed our position with Ray Keller and John Dosa, representing the -

l VSC-24 Owners Group, regarding grinding the weld crown on the MSB mock-up to facilitate a UT examination from the structurallid (top) side of the MSB.

The following summarizes our position on this issue:

The NRC does not object to grinding the weld crown on the mock-up and that it made dense to explore this option. However, if the Owners Group intends to pursue demonstration of the UT examination from the MSP shell (s,ide) orientation, then NRC needs to observe demonstration of this technique in the "as-built" condition e.g. before the weld crown is removed.

NRC UT experts concluded that grinding the weld crown would produce indeterminate effects on UT examination from the side, especially for flaws 1 13 which are near the weld crowis.

There was no apparent way to conclude that the questions on these indeterminate effects cC'Jld be resolved Via a review of "before Wold Crown removal' data and 'atter weld crown removal" data. In addition, this demonstration of the technique in the "as built' condition is consistent with the ASME Code.

)

i If the Owners Group desires to quantify the effects and justify that the effects do not I

significantly alter the procese and results demonstrated for the side examination, the staff would f

review that information. However, it may be more effective to observe the demonstration with the weld crown intact and continue the inspection when the Owners Group has' developed a process for examining the weld from ine top.

CC:

FCS, TJK1, EJL, PLE

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1.S Mali 8linvolope info:

(34F34DE2.A46 : 17 : 42080)

Subject:

More on Grinding the Weld Crown Creation Date:

2/24/98 5:46pm From:

Allen Howe Created By:

WND1.WNP7:AGH1 itecipients Action Date & Time Post Office intemet mta2 Post Office Intemet sr doctor Post Office TWD2.TWP0 DAJ1 (Deborah Jackson)

EMH1 (Edwin Hackett)

MGV (Michael Vassilaros)

Post Office WND1.WNP'7 CKB1 (Charles (Ken) Battige)

{

EJL CC (Eric Leeds)

FCS CC (Frederick Sturz)

PLE CC (Patricia Eng)

TJK1 CC (Timothy Kobetz)

Domain. Post Office Delivered Route intemet Pending intemet:inel. gov intemet Pending intemet:pnl. gov TWD2.TWP0 Pending TWD2.TWP0 WND1.WNP7 Pending WND1.WNP7 Files Size Date & Time MESSAGE 1577 02/24/98 05:46pm

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