ML19224D571
| ML19224D571 | |
| Person / Time | |
|---|---|
| Site: | Columbia, Washington Public Power Supply System, Satsop  |
| Issue date: | 06/25/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Strand N WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| References | |
| NUDOCS 7907120630 | |
| Download: ML19224D571 (1) | |
Text
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UNITED STATES I y,g l $ d,{'. 4
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1990 N. C ALIF ORNI A HOUL F VARD c'
SUIT E 202, WA LNUT CR E E K PL AZ A WALNUT CR FE K. CALIFORNI A 94536 June 25,1979 Docket ilos. 50-460 50-397 50-508 50-509 50-513 lbshington Public Power Supply System P. O. Box 958 3000 George Washington May Richland, Washington 99352 Attention:
Mr. fl. O. Strand Managing Director Gentlemen:
The enclosed IE Bulletin ilo. 79-13 is forwarded to you for information.
No written response is required.
If you desire additional information regardin3 this matter, please contact this office.
Si ncerely,
/: 4 /. 3. ( L. __
R. H. Engelken Director
Enclosures:
1.
IE Bulletin flo. 79-13 2.
Listing of IE Bulletins Issued in Last 12 Months cc w/ enclosures:
M. E. Witherspoon, WPPSS A. D. Kohler, WiiP-2, WPPSS J. P. Thomas, WPPSS W. J. Talbot, WPPSS G. C. Sorensen, WPPSS 7
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UNITED STATES NUCLEAR REGULATORY C0K11SSION OFFICE OF INSPECTION AND ENF0PCEMENT WASHINGTON, D.C.
20555 June 25, 1979 IE Bulletin No. 79-13 CRACKING IN FEEDWATER SYSTEf:! PIPING Description of Circumstances:
On May 20, 1979, Indiena and Michigan Power Conpany notified the tiRC of cracking in two feedwater lines at their D. C. Cook Unit 2 facility. The cracking was discovJred following a shutdown on May 19 to investigate leakage inside containnent.
Leaking circumferential cracks were identified in the 16-inch feedwater elbows adjacent to two steam generator nozzle elbow welds.
Subsequent radiographic examination revealed crac'K indications in all eight steam generabr 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 infomed licensees of the D. C. Cook failures and reodested specific information on feedwater system design, fabricntion, inspeydionandoperatinghistories.
To further explore the generic nature of the /. racking problem, the Office of Inspection and Enforcement requested lipensees of PWR plants in current outages to immediately conduct volurretric efanination 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 sinilar locations at their H. B. Robinson Unit 2.
Duquesne Power and Light conf 4 red on June 18, 1979, that radiography has shown cracking in their Beaver Val ey Unit I feedwater piping to vessel nozzle weld.
Public Service Electric and Gas Company reported on June 20, 1979 that Salem Unit 1 als' has track indications. Wisconsin Public Service conpany decided on June <1, 979 to cut out a feedwater nozzle-to-pipe weld which contained questionable indication, for metallurgical examination. 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 feedwater nozzle-to-pipe configurations for D.C. Cook and foi San Onofre are shown on the attached figures 1 and 2.
A typical feedwater pipe-to-nozzle weld joint detail showing the principal crack. locations for D.C. Cook and San Onofre
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are shown on the attached figure 3.
v On March 17, 1977, duringheat-upfod ATE DOCUMENT Unit 1, a leak was discovered in tney the 16-inch diameter feedwater pipin fnt.
u ent previously entered E
nondestructive examination of all no sys em under:
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