ML17256A953
| ML17256A953 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 05/18/1982 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8205240469 | |
| Download: ML17256A953 (6) | |
Text
REGULA'TORY FORMATION DISTRIBUTION SY M ('RIDS)
'AGCESSION NBR;8205240469 DOC ~ DA'TE: 82/05/18 NOTARIZED:,,NO DOCKET FACIL;.50 244 Robert Emmet Ginna Nuclear Plant>
Uni,t ii <<Rochester G
05000244
'AUTH,NAME AUTHOR AFFILIATION MA'IERRJ ~ ED Rochester Gas 8 Electric Corp ~
RHC IP 9 NAME, RECIPIENT AF F IL'lbTION QRUTCHF IELD P D ~
Operating Reactors Br anch 5
~ ~
4 v
v
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SUBJECT:
Responds to NRC auestions on eddy cur rent insp program re steam generator evaluations
/
DISTRIBUTION CODE! 'A001S
.COPIES RECEIVEDoLTR., 3 -ENCL SIZEj
'TITLE:
General Distribution for after Issuance of.Operating License NOTES:NRR/DL/SEP icy, 05000244 REC IP IENT ID "CODE/NAME ORB ¹5 "BC 01
.'COPIES LTTR ENCL RECIPIENT ID 'CODE/NAME COPIES LT<<TR ENCL INT<<ERNAL: ELD/HDS4 NRR/DL OIR NRR/DS I/RAB RGN1 NRR/DHFS DEPY08 1
NRR/
GRAB 1
04 1
EXTERNAL: ACRS NRC PDR NTIS NOT>ES:
-09 10 1'2 1
1 LPDR NSIC
~ 03 05 I
Q lTOTAL.NUMBER OF COPIES 'REQUIRED:
LTTR 29 ENCL
Ih er c
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ti IIIIIIIIII IIIIIIIIIIII Zlà I III/g/III ROCHESTER GAS AND ELECTRIC CORPORATION
~ 89 EAST AVENUE, ROCHESTER, N.Y. 14649 JOHN E. MAILER Vice Preeident TKI.EPHONE AREA cooK Tie 546-2700 May 18, 1982 Director of Nuclear Reactor Regulation Attention:
Mrs Dennis M. Crutchfield, Chief Operating Reactors Branch No.
5 U.S. Nuclear Regulatory Commission Washington, D.C, 20555
Subject:
Eddy Current Inspection Program Steam Generator Evaluation R.
E. Ginna Nuclear Power Plant Docket No. 50-244 Dear Mr. Crutchfield-.
This letter is in response to questions from members of the NRC Staff.
Question 1
Provide a full breakdown of eddy current examination sampling.
Answer 1
"A" Steam Generator Examination Program The eddy current inspection included:
a) b)
c) d)
99.96% of inlet tubes to the first support plate, ill inlet tubes over the U bends, 415 outlet tubes to the first support plate, ill outlet tubes to the sixth support plate.
(These are the same tubes identified in item b above.)
"B" Steam Generator Examination Program The eddy current inspection included:
a) b)c) d)
99.96$ of inlet tubes to the first support plate, 251 inlet tubes over the U-bends, 415 outlet tubes to the first support plate, ill outlet tubes to the sixth support plate.
(These tubes were included in the number of tubes: inspected in item b above.)
82052404'20518 PDR ADQCK'05000244, goo<
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I
ROCHESTER GAS AND ELECTRIC CORP.
DATE May 18, 1982 TO Mr. Dennis M
Crutchfield SHEET NO.
2 Question 2
Confirm that all tubes within two rows of the periphery on the cold leg side of both steam generators were examined.
Answer 2
Two rows of tubes were examined around the periphery of both steam generator's outlet (cold leg).
Question 3
Were periphery tubes examined for their full length or partial length?'nswer 3
All periphery tubes were examined to the first support plate.
Additionally, all periphery tubes in the "B"
Steam Generator inlet were re-examined after repairs to the sixth support plate, with 140 of these tubes being examined over the U-bends.
Question 4
What was the axial length of the indications found in tube R32 C15 at the time of plugging?
Was the examination absolute or differential?
Answer 4
In April 1976, utilizing a differential eddy current technique, R32 C15 had a dent signal at the first support plate, a localized ID signal 3.5 inches above the top of the tube sheet and a distorted tube sheet entry signal (much less than 20% O.D. signal).
In April 1980, utilizing differential and absolute techniques, R32 C16 had a localized 36% outside diameter signal approximately one inch above the top of the tube sheet Very truly yours, Jo E.
aier
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