ML19247A352
| ML19247A352 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 06/25/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stewart W FLORIDA POWER CORP. |
| References | |
| NUDOCS 7907310018 | |
| Download: ML19247A352 (2) | |
Text
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NUCLE AR REGUL ATORY COMMISSION ig
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,f JUN 2 51979 In Reply Refer To:
RII:JPO 50-302 Florida Power Corporation ATTN:
k'. P. S t ewa r t, Director Nuclear Operations P. O. Box 14042, Mail Stop C-4 St. Petersburg, FL 33733 Gentlemen:
Enclosed is !E Bulletin 79-13 which requires action by you wit'r regard to yeur power reactor f acility(ies) with an operating license.
actions required Should you have any questions regarding this Bulletin or the by you, please contact this office.
Sincerelv, e
James P. O'Reilly
,y Director En c l o s >;r e s :
1.
IE Eullet in Sc. 79-13 2.
List of IF Sulletins Issued in Last 12 5'on t h s b \\J J h> Uau a..la)te L p
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. Florida Power Corporation cc w/ encl:
G. P. Beatty, Jr.
.uclear Plant Superintendent N
Post office Box 1228 Crystal River, Florida 32629 b
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UNITED STATES NUCLEAR REGULATURY COMMISSION OFFICE OF INSPECTION AND ENFORCDET WASHINGTON, D.C.
20555 June 25, 1979 IE Bulletin No. 79-13 CRACKING IN FEEDWATER SYSTEM PIPING Detscription of Circumstances:
Indians and Michigan Power Company notified the NFC of On May 20, 1979, cracking in two feedwater lines at their D. C. Cook Unit 2 facility.
ne investigate leakage cracking was discovered f ollowing a shutdown on May 19 to Leaking circumf erential cracks were identified in the inside containment.
to two stes= generator nozzle elbow welds.
16-inch feedwater elbows adjacent radiographic examination revealed crack indications in all eight Subsequent this location on both Units I and 2.
stea= generator feedwater lines at to all PVR licensees by the Office of letter was sent On May 25, 1979, a Nuclear Reactor Regulation which inf ormed licensees of the D. C. Cook f ailures and requested specif!- inf ormation on f eedwa ter systa: d e s ig n, fabrication, To further explore the generic nature of inspection and operating histories.
the cracking problem, the Office of Inspection and Enforcement requested licensees of PWR plants in current outages to immediately conduct volumetric 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.
radiographic examination revealed indications of cracking June 5, 1979, that in f eedvater nozzle-to-piping velds on two of three steam generators of San Onof re Unit 1.
On June 15, 1979, Carolina Power and Light repor ted that radiography showed crack indications in similar locations at their F. B. Robinson Unit 2.
Duquesne Power and Light conf trued on June 18, 1979, that radiography has shown cracking in their Beaver Valley Unit I feedvater piping te vessel 20, Public Service Electric and Can Company reported on June nozzle veld.
1979 that Sa len Unit I also has crack indications.
Wisconsin Public Service ccupany decided on June 20, 1979 to cut out a feedwater nozzle-to-pipe veld which contained questionable indication, f or metallurgical examina tion.
As of June 22, 1979 and since May 25, 1979 seven other PVR f acilities have inspected the f eedvater nozzle-to-pipe welds without finding cracking indications.
The feedwater nozzle-to-pipe configurations for D.C. Cook and for San Onofre are shown on the attached figures I and 2.
A typical f eedwater pipe-to-nczzle veld joint detail showing the principal crack locat ions for D.C. Cook and San Onofre are shown on the attached figur' 4 DUPLICATE DOCUMENT On March 17, 1977, during heat-g, r o.
Unit 1, a leak was discovered i Entire document previously red b
into system under:
the 16-inch clameter f ecdwater nondestructive examination of a
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