ML19247A344
| ML19247A344 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 06/25/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Clayton F ALABAMA POWER CO. |
| References | |
| NUDOCS 7907310002 | |
| Download: ML19247A344 (2) | |
Text
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- cui*'c UNITED ST ATES s
NUCLE AR REGUL ATORY COMMISSION
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In Reply Refer To:
RII:JPO 50-364 Alaba a Power Company ATTS:
F. L. Clayton, Jr.
S'nior Vice President P. O. Box 2641 Bircingha=, AL 35291 Gentlecen:
to yc u for i n f e r r.a t ic r..
Nc writ ur The enclosed Bulletin 79-13 is forwardea infer ation regarding u. i s respense is required.
If you desire additiona.
catter, please contact this office.
Sincerely,
~%
a 2-Jares P.
C'ke;'.'.
'- s Dir ec t e r
Enclosures:
1.
IE Eu'.letin
'c.
79-13 2.
Listing of IL Bulletins Issue; u Last 12 Mcrths e r-Q
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. Alabama Power Company cc w/enci:
A. R. Barton Executive Vice President Post Office Box 2641 Birmingham, Alabama 35291 C. Biddinger, Jr.
Manager-Corporate Quality Assurance Post Office Box 2641 Birmingham, Alabama 35291 R. E. Hollands, Jr.
QA Supervisor Post Office Box U Ashford, Alabama 36312 300R 0!i!GiWAL e.a.w
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCD{ENT WASHINGTON, D.C.
20555 June 25, 1979 IE Bulletin No. 79-13 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
On May 20, 1979, Indiana and Michigan Power Company notified the NRC of cracking in two f eedwater lines at their D. C. Cook Unit 2 facility.
The cracking was discovered following a shutdown on May 19 to investigate leakage Leaking circumferential cracks were identified in the inside rontainment.
16-inch feedvater elbows adjacent to two steam generator nozzle elbow welds.
Subsequent radiographic examination revealed crack indications in all eight steam generator f eedwater lf net at this location on both Units I and 2.
to all FWR licensees by the Of fice of a letter was sent On May 25, 1979, Nuclear Reactor Regulation which inf ormed licensees of the D. C. Cook f ailures and requested specific information on feedwater syste:: d es ig n, fabrication, inspection and operating histories. To further explore the generic nature of the cracking problen, the Office of Inspection and Enforcement requested volumetric licensees of PWR plants in current outages to immediately conduct examination of certain f eedwater piping welds.
As a result of these actions, several other licensees with Westinghouse steam Southern California Edison reported on generators reported crack indications.
1979, that radiographic examination revealed indications of cracking June 5, in feedwater nozzle-to-piping selds on two of tht=ae steam generators of San Onofre Unit 1.
On June 15, 1979, Ca rolina Power and '.ight reported that their H. B. Robinson radiography showed crack indications in similar locations at Unit 2.
Duquesne Power and Light confirmed on June 18, 1979, that radiography has shown cracking in their Beaver Valley Unit I feedwater pipir.g to vessel nozzle weld. Public Service Electric and Cas Company reported on June 20, 1979 that Salem Unit 1 also has crack indications. Wisconsin Public Service company decided on June 20, 1979 to cut out a feedwater nozzle-to-pipe weld which contained questionable indication, f or metallurgical examina tion.
As of June 22, 1979 and since May 25, 1979 seven other PWR facilities have inspected the f eedwater nozzle-to-pipe welds without finding cracking indications.
The f eedwater nozzle-to-pipe configurations for D.C. Cook and for San Onof re are
- "r* - ' f aa@= t ar ni ne-to-no zzle veld shown on the atteched figures !
4' e
joint detail shoving the prine:
DUPLICATE DOCUMENT are shown on the attached figui b / t.vM,,
f Entire document previously entered L March 17, 1977, during heat-into system under:
Unit 1, a leak was discovered 7GCQ503#
the 16-inch diameter feedwater ANO nondestructive examination of.
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