ML20094N904
| ML20094N904 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 08/01/1984 |
| From: | Jens W DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 40, EF2-69286, NUDOCS 8408160444 | |
| Download: ML20094N904 (3) | |
Text
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WIyn3 H. Jens Vce Presert tax! car Opma ens f ef mF2 oco nocn ou nymy ISOn f4ewport fAch4m 4816 (013; 566-4150 August 1, 1984 EF2-69286 Mr. James G.
Keppler Regional Administrator Region III U.
S.
Nuclear Regulatory Commission 799 Roosevelt Road Glen Eliyn, Illinois 60137
Dear Mr. Keppler:
References:
(1) Fermi 2 NRC Docket No. 50-341 (2) Letter, D.
A.
Wells to J.
G.
- Keppler, April 1, 1981, EF2-49,963 (3) Letter, D.
A. Wells to J.
G.
- Keppler, July 29, 1981, EF2-5413 0
( 4) Letter, D.
A.
Wells to J.
G.
- Keppler, November 2 5, 1981, EF2-54714
( 5) Letter, D.
A. Wells to J.
G.
- Keppler, March 25, 1982, EF2-57155 (6) Letter, D.
A. Wells to J.
G.
- Keppler, July 23, 1982, EF2-59381
Subject:
Final Report of 10CFR50. 55(e) Item 40
" Calibration of Torque Wrenches" This is Detroit Edison's final report concerning calibration of torque wrenches.
Item 40 was originally reported as a potential deficiency on March 3, 1981, and subsequently documented in Reference (2).
Interim reports were provided in References (3), ( 4), ( 5) and (6).
This report is a summary description of the deficiency and corrective actions.
Description of Deficiency During an audit of Wismer and Becker concluding in February, 1981, a problem was identified in the specification of calibration tolerances for torque wrenches.
Requirements
$ lib bb 8408160444 840801 sb PDR ADOCK 05000341 AUG 0 IS64 S
4 ', _ ag Mr. James G. Keppler
- August 1,11984 EF2-69286 Page 2 indicated that wrenches were L to be calibrated within plus or minus four percent.
.The calibration laboratory, Toledo Testing Laboratory, considered this requirement to mean plus or minus four' percent of full scale..However, the wrenches should have been. calibrated to plus or - minus four percent of the reading.
The calibration is normally performed at-four positions on the' scale.
In addition, a number of wrenches calibrated by Toledo Testing Laboratory did not meet accuracy requirements.
The
~
laboratory report contained no specific notations indicating that the wrenches were either acceptable or unacceptable.
Wismer and Becker received the wrenches from the lab and' issued them to the field without questioning the lab report.
Thus, the following problems were identified:
o Wismer and Becker. failed to. provide. acceptance criteria to Toledo Testing. Laboratory; o
Toledo Testing Laboratory failed to adjust torque wrenches which were out of tolerance;
~
o Wismer and Becker failed to recognize that the wrenches were out of tolerance when returned to the site; o
Toledo Testing Laboratory failed to attest to the accuracy of the wrenches after completing calibration.
Analysis of Safety Implications The use of out of tolerance torque wrenches could have caused bolts to be torqued incorrectly.. This could result in the failure of a safety related component to perform its intended function.
Corrective Action i
The following actions have been completed to correct the problens and prevent recurrence:
o The remedial corrective action included an audit of site contractor torque wreHoh calibration programs to determine if similar deficiencies existed.
No significant deficiencies were identified in any case except for Wismer and Becker.
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a F
Mr.'. James G'.
Keppler August'1, 1984 EF2-69286
' Page'3
+
t o-All Wismer and_Becker1 torque. wrenches'were
. recalled. from the. field.
Wrenches. issued to the field in.an out'of tolerance condition were,
~
identified and'recalibrated.
An investigation-was?
completed to determine Where _ dae, defective.
' wrenches were used and Deviation Disposition-Requests (DDR's) ' were : issued to obtain engineering evaluation.
Wismer _ and Becker procedures were 'rev'ised to-o require; torque wrench calibrations at.a more frequent finterval. : Currently, torque wrenches are
-calibrated monthly ~.:
o Specifications were revised to clarify calibration -
- tolerances and to' require any necessary. adjustment of the torque. wrenches.
As a. result of $he dihposition to. the 'above -DDR's, o
a retorquing program was established in March,.
~
1981, and has been satisfactorily completed.
This is Detroit Edison's. finsi report on this' item.
If you have questions concerning this matter, please contact Mr. Lewis P. _ Bregni',- (313) 586-5083.
Sincerely, I
cc:-
Mr.
P. M.
Byron Mr.
R.
C.
DeYoung Mr.
R.
C. Knop f
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