ML19338G428
| ML19338G428 | |
| Person / Time | |
|---|---|
| Site: | Yellow Creek  |
| Issue date: | 10/03/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8010290319 | |
| Download: ML19338G428 (3) | |
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TE.NNEssEE VALLEY AUTHORITY CH A TTA NCC 3 A. TEN N ESSEE 37 le f 300 Chestnut Street Tower II Cotober 3, 1980 W. James P. O'Reilly, Director Office of Inspection and Enforcement C..S.. Nuclear Regulatory Co= mission Region II - Suit' 3100 101 :triatta Stree Atlanta, Georgia 30 03
Dear Mr. O'Iteilly:
YLLLOW CP5EK UUCLEAR PLANI LliITS 1 A:iD 2 - X3C-0!E :12CION II LETTEP.
RII:WPK 50-566/60-03 AnD 50-367/80-03 INSPECTION FIPORT - SECOND PIVISED hlI;PONSE TO INFRACTICN The cuojec: letter dated February 28, 1980, cited TVA with ene infracticn in acccedhnce with 10 CFR 2.201 en failure to establish acaquate ceasures to centrol radicsraph/. The initial respence to this infraction S.nc sub-citted on !! arch 24, 1900. Supplemental recorts t;ere submitted en April 28, 19c0, anc June 10, 1930, and a revised respense was submitted en August 18, 1980.
.RC-0IE Inspector J. Coley requected that the scope of this infrac-tion be expr.nded to cover the adciticnal problem of film darkening. The enc 1csed second revised final report covers this problem.
If ycu have any questiens concernin.; this catter, please set in tcuch with D. L. Lambert at FTS 857-2851.
Very truly yours, TEIRfEOSEE VALLEY AtIIHCRITY L. M. 1:i11.5, U.anager Nuclear Regulation and Sa.fety Enclosure Mr. Victor Stello, Jr., Director (Enclosure)/
oc:
Office of Inspecticn and Enforcement U.S. ?!uclear 'Resulatory Cc= mission
'dashin6 ten, C: E0555 G6/T Sij k.
-mx 8010290,31 9
ENCLOSURE YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 FAILURE TO ESTABLISH ADEQUATE MEASURES TO CONTROL RADI SECOND REVISED RESPONSE TO NRC INFRACTION 50-566/80-03-01, 50-567/80-03-01 Infractign As required by 10CFR50, Appendix B, Criterion IX, and as implemented by Tennessee Valley Authority (TVA) Topical Report TVA-TR-75-A1 Section 17.1 A.9, " Measures shall be established to assure that special processes, including---nondestructive testing are controlled and acccmplinhed---in accordance with applicable codes--."
Section III, paragraph X3334.4, requires that penetrameters be placed ASME Code adjacent to the weld seam, in addition paragraph NE-5211 requires full radiography for longitudinal butt welded containment joints.
Contrary to the above, on February 7,1980, seven radiographs of containment structural butt welds exhibited penetrameters and shims extending into the weld obscuring part of the area of interest.
Corrective Actions Taken and Results Achieved All radiographs made before February 22, 1980 (6,849), have been reexamined for similar deficiencies, and an additional 102 were found and nonconformed.
Reevaluation of the 102 radiographs by Chicago Bridge and Iron (CBI) initially nonconformed resulted in the determination that shims were not overlapping into the weld in 95 cases, and only 7 of thase welds required reradiographing.
has resulted in 7 more welds which TVA has requested to beTVA reevaluation of the ceradiographed.
As stated in TVA's March 24, O'Reilly, two of the radiographs cited by the NRC (seam Al1980, letter to J. P.
1 to 2 and seam A2 increments 20 to 21) were reevaluated and found increments to be acceptable.
Thus, only 19 welds will have to be reradiographed.
In the course of film review, a problem was revealed in that so=e of the film had undergone a severe darkening after being examined and accepted by CBI, TVA, and ANI.
The rilm identified in this problem has also been conconformed and reported in NCR YC-088 An initial investigation of this problem revealed that TVA had not To rectify this situation, all film in storage was reviewed and co and industry expertise was called upon to determine if processed pany film could be effectively rewashed to achieve archival storage quality.
March 3, 1980 (6,943After reviewing all film processed from April 5,1979
, through film intervals),
These intervals were reprocessed.there were 758 film intervals with density 3.7 or above.
intervals reprocessed, From the 758 Nineteen intervals were located in penetration cutout areas of t reshot.
shell; no reshots were made on these.
e This information was noted en the film jacket.
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A strip of film approximately 1-1/8" by 4-1/2" was selected, at random, from the end of a contract file film for a = ethylene blue test for each day's wash process. The results of the methylene blue tests on all revashed and refixed films were very good. Concurrent with the rewash considerations, other factors affecting film storage life (film quality, chemical quality, processing technique) were thorougnly investigated.
As a result of these investigations, a portion of the film processing procedure was identified as the likely cause of the film darkening.
Approximately 500 gallons of water used in film processing was suppli M by a small trailer tank during the period from April 5,1979, to J 7 11, 1979. The processing required 3 gal / min for film washing whicn could not be easily regulated from the trailer. In addition, through the hot monthg,F) and the water cooler in the trailer could the water from the tank trailer was too hot for process use ( 90 not cool fast enough to maintain 78 F wash water.
Steos Taken to Avoid Further Recurrence In order to prevent a recurrence, the film interpreters and radiographers have been instructed in the requirements of shim placement. Also, CBI will issue a special written instruction informing all radiographers and film interpreters on proper placement of shims. This Special Instruction No. 5 will become part of the Special Instruction Folder No. 3.0 which is used in training new radiographers and film interpreters.
To prevent film darkening, TVA has established strict processing guidelines and tests to ensure that all film processed is of archival quality. Tests include hypo estimator tests each time the film is processed, as well as silver stain densitometric tests performed weekly and methylene blue testa performed every three months.
Date of Full Cocoliance The special instruction on shim placement has been issued and the 12 welds were rert diographed by July 1, 1980.
Six additional welds identified by TVA were reradiographed by August 13, 1980. The seventh weld was removed for installation of a penetration and thus did not require reradiographing. All radiographs, both those reradiographed and others, were found acceptable from penetrameter concern.
Concerning the film darkening of radiographs, TVA's followup action of September 25, 1980, included random densitometer checks of reshot radiographs. The checks indicated that the radiographs are of archival quality.
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