ML19224D556
| ML19224D556 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 06/25/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Koester G KANSAS GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7907120600 | |
| Download: ML19224D556 (1) | |
Text
jf""",*%g s.
,g UNITED STATES S.
N!! CLEAR REGULATORY COMMISSION 5 rl7) fw -]/ g,j
- fq nEaton iv QQitif S (46 c 611 RYAN PLAZA DRIVE, SUITE 1000
%.. '.' N U
o AR LINGTON, TE X AS 76012 June 25, 1979 In Reply Refer To:
RIV Docket No. STN 50-482/IE Bulletin 79-13 Kansas Gas and Electric Company ATTN:
Mr. Glenn L. Koester Vice President-Operations Post Office Box 208 Wichita, Kansas 67201 Gentlemen:
The enclosed IE Bulletin 79-13 is forwarded to you for information. No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, M
7
' % c (? h / f [ I w
Karl V. Seyfrit-Director
Enclosures:
1.
Listing of IE Bulletins Issued in Last 12 Months cc: w/ enclosures Messrs.
Nicholas A. Petrick, SNUPPS D. T. McPhee, Kansas City Power and Light Company Gerald Charnoff, Shaw, Pittman, Potts & Trowbridge E. W. Creel, Kansas Gas and Electric Cc 'any 414 065 79071 20600
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-13 Date:
J"ne 25, 1979 Page 1 4
CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
On May 20, 1979, Indiana and Michigan Power Company notified the NRC of cracking in two feedwater lines at their D. C. Cook Unit 2 facility. The cracking was discovered following a shutdown on May 19 to investigate leakage inside containment.
Leaking circumferential cracks were identified in the 16-inch feedwater elbows adjacent to two steam generator nozzle elbe- ' elds.
Subsequent radiographic examination revealed crack indications in all eight steam generator feedwater lines at this location on both Units 1 and 2.
On May 25, 1979, a letter was sent to all PWR licensees by the Office of Nuclear Reactor Regulation which informed licensees of the D. C. Cook failures and requested specific information on feedwater system design, fabrication, inspection and operating _ histories.
To further explore the generic nature of the cracking problem, the Office of Inspection and Enforcement requested licensees of PWR plants in current outages to immediately conduct volumetric examination of certain feedwater piping welds.
As a result of these actions, several other licensees sith Westinghouse steam generators reported crack indications.
Southern California Edison reported on June 5, 1979, that radiographic examination revealed indications of cracking in feedwater nozzle-to-piping welds on two of three steam generators of San Onofre Unit 1.
On June 15, 1979, Carolina Power and Light reoorted that radiography showed crack indications in similar locations at their H. B. Robinson Unit 2.
Duquesne Power and Light confirmed on June 18, 1979, that radio;taphy has shown cracking in their Beaver Valley Unit 1 feedwater piping to vessel nozzle weld.
Public Service Electric and Gac 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 a questionable indication, for metallurgical examiation. As of June 22, 1979 and since May 25, 1979 seven other PWR facilities have inspected the feedwater nozzle-to pipe welds without finding cracking indications.
The fredwater nozzle-to pipe configurations for D.C. Cook and for San Onofre are ni-
'^---
shown an the attached Figures 1 and 2.
A typical feedwatar joint detail showing the principal 1 DUPLICATE DOCUMENT are shoen on the attached Figure 3 i"
d ntire document previously entered E
On March 17, 1977, during heat-up 1 into system under:
Unit 1, a leak was discovered in tl the 16-inch diameter feedwater pipi I
ANO79Obk 3d nondestructive examination of all r
![
h No. of pages:
k l
l g
D
?je Nc q'o, o
UNITED STATES
[f
[j NUCLEAR REGULATORY COMMISSION g
r REGION IV 7, Qia.f /
3 (k.$34
[
Gli RYAN PLAZA DRIVE, SUITE 1000
[
- ss**
June 25, 1979 la Reply Refer To:
RIV Docket No. 50-382/IE Bulletin 79-13 Louisiana Power and Light Company ATTN:
Mr. D. L. Aswell Vice Pr2sident Power Production 142 Delaronde St.
New Orleans, Louisiana 70174 Gentlemen:
The enclosed IE Bulletin 79-13 is forwarded t) you for inforcation. No written response is required.
If you desire addition.1 information regarding this matter, please contact this office.
Sincerely,
-y 9
7;7ed Q,/y+w' Karl V. Seyfrit, Director Znclosures:
1.
Listing of IE Bulletins Issued in Last 12 Months
\\. (l
/!
414 069 790722ocoa
UNITED STATES NUCLEAR REGULATORY COMf!ISSION OFFICL OF INSPECTION AND ENFORCFMENT WASHINCTON, D.C.
20555 IE Bulletin No. 79-13 Date:
June 25, 1979 Page 1 of 4 CRACKING IN FEEDWATER SYSTEt! PIPING Description of Circumstances:
On tiny 20, 1979, Indiana and dichigan Power Company notified the NRC of cracking in two feedwater lines at their D. C. Cook Unit 2 facility.
The cracking ::s discovered following a shutdown on Flay 19 to investigate leakage inside containment.
Leaking circumferential cracks were identified in the 16-inch feedwater elbows adjacent to two steam generator nozzle elbow welds.
Subsequent radiographic examination revealed crack indications in all eight steam generator feedwater lines at
.is location on both Units 1 and 2.
On May 25, 1979, a letter was sent to all PWR licensees by the Office of Nuclear Reactor Regulation which informed licensees of the D. C. Cook failures and requested specific information on feedwater system design, fabr W. ion, inspection and operating histories. To further explore the generie nature of the cracking problem, the Office of Inspection and Enforcement mquested licensees of PWR plants in current outages to immediately mmkct volumetric examin.ttion of certain feedwater piping welds.
As a result of these actions, several other licensees with Westinghouse steam generators reported crack indications.
Southern California Edison reported on June 5, 1979, that radiographic examination revealed indications of cracking in feedwater nozzle-to piping welds on two of three steam generators of San Onofre Unit 1.
On June 15, 1979, Carolina Power and Light reported that radiography showed crack indications in similar locations at their H. B. Robinson Unit 2.
Duquesne Power and Light confirmed on June 18, 1979, that radiography has shown cracking in their Beaver Valley Unit 1 feedwater piping to vessel nozzle weld.
Public Service Electric and Gas 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 a questionable indication, for metallurgical examiation. As of June 22, 1979 and since May 25, 1979 seven other PWR facilities have inspected the feedwater nozzle-to pipe welds without finding cracking indications.
<r The feedwater nozzle-to pipe configur DUpLICA
' ' "a for San Onofre are shown on the attached Figures 1 and ;
T joint detail showing the principal c g into, Entire do t previously entered are shown on the attached Figure 3.
-r syste u der:
ANO7fWO2f[J3(/p' On March 17, 1977, during heat-up fc Unit 1, a leak was discovered in the the 16-inch diameter feedwater pipi' No, of xam n of all n Pages g
nondestructgv adt '
N
'N
%_