ML17256A756
| ML17256A756 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 06/10/1983 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8306140410 | |
| Download: ML17256A756 (19) | |
Text
REGULATOR NFORMATION DISTRIBUTION S EM (RIDS)
ACCESSION NBR:e306140<10 DOC.DATE; e3/06/10 NOTARIZED:. NO DOCKET 0
FAOIL:50 244 Rober t EmmetGinna Nucl-ear>>Pl anti Uni~t 1r 'Rochester>>
G 050002r14 4UTHoNAME AUTHOR AFFLLIATION MAIERgJ,E, Rochester Gas 8 Electric Corp>
RBCIP ~ NAME.
RECIPIEN'f AFFILZA'TION ORUTCHFIELDr D ~
Oper ating Reactors Branch 5
SUBJECT:
Documents <<tube R3QC5rl r emoval from 8;steam generator 2 hot leg,'Resul ts of BMl analyses will,be submi,tted "in.Fal 1
1983m Sequence>> of <<events 8 eddy cur r ent"'insp <<encl DI'STRIBUTION CODE j A00 1'S
<<COPIES 'RECEIVED LTR "ENCL
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)TOTAL NUMBER OF 'COPIES REQUIREDTTR 26 ENCL 24
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/.0'UBE SPEC/MEN IS 3'Z.@AT IIVC4ES LoNG IHEASURE/v/E/NTS 7AKEN SA+E CoCOT/O./V PS SPECIMEN'fO.Z TuBE SPEa~FNS PULLEO FROM P
~l~ R34C54 O D-N.EF.GUREMEND
Attachment B
Eddy Current Inspection Associated with Tube Pull Following the attempted tube pull when it became apparent that the tube might not be cut, a comprehensive eddy current inspection program of the tube to be removed and 6 adjacent tubes were undertaken.
The objective of the program was to determine whether R34C54 was cut and, if not, to ascertain whether any damage had been done to adjacent tubes.
The multifrequency inspection used the -same techniques and frequencies as are used for all Ginna inspections.
Except as noted in the discussion of
- results, a standard 0.720 inch probe was used for all inspections.
All tubes, except for R34C53 which has a sleeve in it, were inspected from the hot leg side up through the U bend and down at least past the 5th support. plate on the cold leg side.
Rather than use a smaller diameter probe for the sleeved tube, the 0.720 inch probe was inserted from the cold leg side and the-tube was inspected from the cold leg side up through the U bend and down past the 1st support plate on the hot leg side to the top of the sleeve.
Inspection was terminated at this point due to limited length of the probe.
The results for each tube are presented below:
R34C54 The inspection confirmed that the tube had not been cut but had been stretched over its hot leg side length.
Based on the eddy current voltage change due to a magnetite signal, which corresponds to the original tube to tube support, plate inter-section, it was determined that the tube moved down through each of the support plates by the following amounts.
Su ort Plate 6
5 4
3 2
1 Downward Movement 1-2 inches 3-4 inches 7-8 inches 10-11 inches 11-12 inches 16-17 inches These values indicate the amount of stretch which occurred in tubing initially above a given support plate.
The balance of the 214 inches of stretch occurred in the tubing initially below the first support, plate but above the upper pulling mandrel, an initial tube length of 60'nches.
In order to inspect above the 6th support plate, since the 0.720 inch probe would not pass above the location, a 0.700 inch probe was used.
The inspection revealed no change in the signals at suppoxt plates.
No significant tube thinning was identified.
4 I
R34RS5 There were no indications.
R33C54Deformation, or a dent, was seen at the 6th support plate.
In addition, review of the absolute channel. showed a shift, in signal from the 6th support plate up to 12 inches above the 6th support plate.
The 0.700 inch probe was required in order to inspect above the 6th support plate.
This indicated some deformation of this portion of the tube, presumably due to contact between the pulled tube and R33C54 which is located directly below the pulled tube.
No baseline data were available for this portion of R33C54.
No other indications were observed in this tube.
R33C54 was subsequently plugged.
R33C53 A small (less than 0.5 mil) dent was observed at the 5th support plate intersection on the hot.leg side.
No baseline data are available for this portion of this tube, however, this degree of minor denting is not unusual for the Ginna generator.
Based on this fact, the fact that no other indic'ations were seen on this -tube, and the fact that the dent did not occur at, the uppermost (6th) support plate but at a lower location, it was concluded that this tube was unaffected by the attempted tube pull.
R32C54 No indications.
R34C53 No indications.
R33C55 No indications.
N N
N'N 1
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'N N
'I J
Y
~I A.
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