ML20107L074
| ML20107L074 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 10/17/1984 |
| From: | Jens W DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 100, EF2-69658, NUDOCS 8411130404 | |
| Download: ML20107L074 (3) | |
Text
1 Dm8 Wayne H. Jens Vxn Pr;sident Nuclear Opwations f
Fermi-2 6400 North O.xie Highway Ecison t==
october 17, 1984 EF2-69658 Mr. James G. Keppler Regional Administrator Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
Reference:
(1)
Fermi 2 NRC Docket No. 50-341 (2)
Letter, D. A. Wells to J. G. Keppler, October 10, 1983, EF2-65287
Subject:
Final Evaluation of 10CFR50.55(e) Item 100
" Unacceptable Contractor Practice Regarding Ultrasonic Testing of Flued Head Structures" Detroit Edison has completed its investigation of Item 100 and has determined that it is not reportable under 10CFR50.55(e).
This item concerned unacceptable contractor practices regarding the ultrasonic testing of flued head structures.
Item 100 was originally reported as a potential deficiency on September 19, 1983, and was subsequently documented in Reference (2).
Investigation by Wismer and Becker Quality Assurance and their Level III nondestructive testing examiner (NDE) determined the ultrasonic test problems were limited to flued head structure anchor blocks to which plate had been, added to strengthen the structures.
Detroit Edison Quality Assurance concurred with this conclusion.
The specific problems identified were:
o The 1-1/2 inch anchor block welds (with plate added) had been examined using an angle beam transducer.
The angle beam transducer was found not to provide 100% coverage on this size anchor block weld due to the added plate.
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No evidence could be found qualifying thel 3 -1/2 linch
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' anchor 4 calibration block as an: equivalent ASME call--
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'bration block.
This anchor calibration block had i been-used in the examination of.some of c the 3-1/2
.inchianchor: block welds.
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~ The' ultrasonic ' examinations on several~ flued head
-anchor blocks were incomplete and tests were not-
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performed-on all of the, anchor block welds.
At the time dhis ' item was reported in Reference ( 2), tho' b
work on the flued head' structure anchor blocks had not been completed. =Because of other priorities, work on these struc-3 tures was deferred for over a year. ~Since work and testing was not complete, the Wismer 'and.Becker NDE~ Level III exam-iner'and Quality Assurance. review ofLthe documentation for-4 final. acceptance had_not been accomplished This review e
would have7 detected.any rejected welds:not repaired,, work or the use of. inappropriate testing techni--
not completed,DEdison.has concluded that the delay between ques.
Detroit start-and completion'.of the work on flued head structures and~the NDE'LevelaIIIand QA reviews of ultrasonic-testing does not-constitute a significant breakdown in the quality assurance program.. Therefore, this itemJis not reportable under 10CFR50.55(e).
The actions taken to resolve the specific concerns identi-fled were:
o New ultrasonic test technique sheets were developed to qualify 'the O' transducer ultrasonic testing tech-niques for,the flued head structure anchor block welds with the additional plate.
This technique afforded 10.04 coverage for the modified flued head structurec.
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The:insitu 3-1/2 inch. anchor calibration block has been qualifled as:an equivalent ASME' calibration block.i Any examinations conducted'using this' 3-1/2 inch' anchor < calibration block,' prior to its qualifi-o cation, are acceptable, o
An insitu anchor calibration block was qualified for the.1-1/2 inch block welds.
All previously examined flued head structure anchor blocks, which contained the additional plate, were reJexamined'using this insitu anchor calibration block and the 0' transducer technique.
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Mr.' James G. Keppler October 17, 1984 EF2-69658 Page 3 o
The Wismer and.Becker-NDE Level III examiner and their Quality Assurance reviewed'and accepted ultrasonic test reports of flued head structure
-anchor block field welds.
o
' Detroit Edison Nuclear Quality Assurance performed a final' review of ultrasonic test reports, weld repair forms and travelers that documented action taken.
This review is documented on a final surveil-lance report QSR No. S-QS-84065.
During ultrasonic testing of field welds on; flued head struc-tures, a shop weld was inadvertently ultrasonically examined and found to be rejectable.
This item is potentially report-able under 10CFR50.55(e) and is being tracked as Item 139.
If you have questions concerning this matter, please contact Mr. Lewis Bregni, ( 313-586-5083. )
Sincerely,
$**Q
'hL2 t
cc Mr. P. M. Byron l}
Mr. R. C. DeYoung Mr. R. C. Knop 1
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