ML20134G914
| ML20134G914 | |
| Person / Time | |
|---|---|
| Issue date: | 10/24/1996 |
| From: | Lainas G NRC (Affiliation Not Assigned) |
| To: | Gibson A, Grant G, Wiggins J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 9611130431 | |
| Download: ML20134G914 (1) | |
Text
_
t AI 24 1%
j MEMDRANDUM TO:
James T. Wiggins, Director, DRS, Region I 1
Albert F. Gibson, Director, DRS, Region II Geoffrey E. Grant, Director, DRS, Region III Thomas P. Gwynn, Director, DRS, Region IV
{.
FROM:
Gus C. Lainas, Acting Director Division of Engineering, NRR
SUBJECT:
STEAM GENERATOR TUBE REPAIR CRITERIA 1
Recently, we sent you a memo, dated 9/25/96, on the subject of Steam Generator 3
Tube Repair Criteria.
i The memo discussed the issue of the repair criteria implemented by licensees particularly with respect to using qualified j
techniques to depth size eddy current indications.
It has come to my attention that EPRI has recently indicated that they i
completed a program to develop a qualified sizing technique for j
circumferential cracks.
NRR is aware that this sizing technique may be implemented by licensees, but NRR has not reviewed the technique or its 4
qualification.
We believe that it is very difficult to depth size stress corrosion cracks reliably.
Leaving circumferential steam generator tube cracks in service based on inspection results would be a precedent as far as t
NRR is aware and may have significant safety implications.
I am requesting that you inform your inspectors to pay attention to this issue.
If a licensee j
is relying on this technique for leaving indications in-service, the matter should be brought to the attention of NRR for further evaluation as soon as i
possible.
4 1
If you or your inspectors have any questions regarding this issue, please feel i
free to -contact me or the applicable NRR staff member (e.g. Ted Sullivan
[(301) 415-3266; E-Mail: EJS] or Cheryl Beardslee [(301) 415-2751; E-Mail:
CDB]).
i
Contact:
C. Beardslee, EMCB/NRR 4
415-2751 Distribution j
Central Files EMCB RF BSheron SCoffin i
PFredrickson JBlake modes WKropp
)
Molmberg IBarnes DPowers PRush 1
DOCUMENT NAME:
G:\\BEARDSLE\\SGTRC j
To receive a copy of this document, indicate in the box f)" " Copy w/o attachaerg/ enclosure; "E" si Copy with l
sttechnent/enetocure; "u" " No copy
'/
/E O.
f 4
i onicE DE:ENCB 6 EMCB:SC G
EFl:Sk DE:ADI8 DE:AD)b CBeards1 h TSullivank Nan JStroskider J #6Lainas MAME
/0 /[/96 to/t /96
/0 /d/96 DATE lO/n/96 10 /r)/96
/
t 0FFICIAL COPY
- ).
p 9p M/
nfN Ud p%qnk i
sgoogo 1
'M hen ~,
- (
- g223g32 Te!"*
Oss a r j
-_