ML20078M036
| ML20078M036 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 10/11/1983 |
| From: | Williams J CINCINNATI GAS & ELECTRIC CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| LOZ-83-0164, LOZ-83-164, NUDOCS 8310240161 | |
| Download: ML20078M036 (5) | |
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%Q THE CINCINNATI GAS & ELECTRIC COMPANY W
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CINCINN ATi, OHIO 45208 October 11, 1983 LOZ-83-0164 J. WILLIAMS JR stNeoR vics PatslOENT NUCLEAR OPERATIONS PRINCfPAL STAFF vfDB-@ l E i~
. Docket'No. 50-358 a
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tc v U.S. Nuclear Regulatory Commission UT~l'~]&q
. Region III Wf"
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pc57f'h 799 Roosevelt Road FI/I sit tiF Filo
/2 Glen Ellyn, Illinois 60137 i
a Attention:
Mr. J.G. Keppler Regional Administrator Gentlemen:
RE:
WM. H. ZIMMER NUCLEAR POWER STATION - UNIT 1 AUGUST 11, 1983 MEETING WITH NUCLEAR REGULATORY COMMISSION PRESENTING PROGRAM FOR WELDING REINSPECTION.OF CLASS I STRUCTURAL STEEL W.O. 57300, JOB E-5590, FILE #503 This: letter is to document an' August 11, 1983 meeting held at Wm. H. Zimmer site between the Nuclear Regulatory Commission (NRC) and The Cincinnati Gas & Electric Company (CG &E ).. The NRC
.was represented by Messrs. L. Kintner, C. Scheibelhut, D.
Keating, and W. Christianson.
During this meeting'CG&E's program for Welding ' Reinspection of ~ Class I Structural Steel was presented.
I The proposed program is summarized below.
Program details are provided in Attachment A to this letter.
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WELDING REINSPECTION OF CLASS I STRUCTURAL STEEL-
SUMMARY
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CG&E has developed a program to evaluate welding non-conformances resulting from reinspection of Class I l
structural steel.
This work is a QCP Task I activity.
Program details are provided in Attachment A.
No relaxation of-the Show Cause Order is being requested-in association
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with this' program.
1 In summary, all accessible Class I structural steel welds will be inspected.
Those welds not meeting visual acceptance criteria will be identified on Nonconformance Reports.
' Analytical evaluations, deleting portions of welds with deficiencies, will be. conducted in order to verify that Code i
allowable stresses are satisfied.
Cases where Code allowable i
stress limits are met, with the reduced weld section, will be T$@
3 8310240161 831011 b31 lhb
- PDR ADOCK 05000358 G
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Mr. J.G. Keppler Regional Administrator October 11, 1983 LO3-83-0164 Page 2 l:-
' d$spositioned" Accept-As-Is".
Total rework investigations e
performed substantiate the assumption that everlap and lack of fusion deficiencies do not mask defects.
Those welds m
found with major deficiencies (including all cracks) will be reworked.
This program is in conformance with the structural steel design and construction commitments
.,. contained in Chapter 3 of the FSAR.
This program is currently in process.
Please let us know if addit'ional information or clarification is required.
'/
Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY By h/E m ILLIAMS, JR.<r ENIOR VICE PRESIDENT i
RRW/sfr
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cc:
NRC Office of Inspection & Enforcement Washington, D.C.
20555
[*
NRC Resident Site Supervisor ATTN:
W.M. Hill NRC Zimmer Project Inspector, Region III ATTN:
E. R. Schweibinz e
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LOZ-83-0164 ATTACHMENT A Welding Reinspection of Class I Structural Steel In 1981, CGEE developed an inspection / analytical program to evaluate welding non-conformances resulting from reinspection of Class I structural steel.
The program's option of dispositioning non-conformances " Accept-As-Is" based on an engineering analysis was discontinued because of NRC concern.
Particularly, the NRC was concerned that overlap and lack of fusion may mask additional defects which could affect the remaining visually accepted
-portions of the welds.
Consequently, further investigation of weld non-conformances were conducted.
The QCP investigation of welding non-conformances found in the Auxiliary Building Control Room Ceiling based on a total rework situation has shown that out of 465 conditions of overlap and lack of fusion, and one condition of cracking, no masked discontinuities were found.
Based upon this effort, we do not believe such total rework of all non-conformances is appropriate.
Instead, CGEE proposes to proceed as outlined belows (1)
All discontintaities found shall be identified on nonconformance reports.
The method established for dispositioning nonconformances shall be as follows:
a.
Original calculations shall be reviewed and revised to delete accumulated length of welds with discontinuities from original design welds specified.
b.
Unless specific information is stated regarding the discontinuity location, the accumulated length of welds with discontinuities will be eliminated at the most critical section to give a coneervative review.
c.
If the remaining portion of the weld, which meets modified visual criteria of AWS L 1.1 - 1972, can accommodate all design loading within Code dllowable stresses, the weld will be dispositioned
" Accept-As-Is".
1
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LO5-83-0164 I
" ATTACHMENT A" Page 2 (2): : The guide established for dispositioning structural steel welding deficiencies identified is as follows:.
a.
Arc Strike - Since'AISC quality criteria and inspection standards require arc strike removal on fatigue designed structural members only,'-arc strikes will not be removed since the steel is not designed for fatigue.
Arc strikes will be repaired if they result in cracking or.if there are multiple arc. strikes that cause a significant loss of base metal.
b.
Consumed Edge - This is not aormally detrimental except for cover plates.
Therefore, with that exception, this condition will be dispositioned
" Accept-As-Is" by the. Architect Engineer.
Cover plates will be evaluated on a case by case basis by the Architect Engineer.
c.
Fusion Type Discontinuity (Slag inclusion, incomplete fusion, and incomplete joint 4
penetration) - The length of this condition is elinninated from the strength review calculations.
d.
Overlap - The length of this condition is eliminated from strength review calculations.
e.
Porosity - When size of the porosity exceeds the amount allowed by the Code, all sections of weld that have porosity over what the Code allows are i
eliminated from strength review calculations.
f.
Undercut - Depending on depth and length, section strengtn calculations are made to see if the I
reduced section can withstand the design loads.
g.
Peening - All peened areas are ground off and reinspected for size and quality weld.
h.
Cracks - All cracks are repaired.
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