ML19247A357
| ML19247A357 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/25/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7907310026 | |
| Download: ML19247A357 (2) | |
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UNITED ST ATES o
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NUCLE AR REGUL ATORY COMMISSION
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REGION ll g I) i 101 M ARll T T A si NW suit t 3100 ok f
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JUN 2 51979 In Reply Refer To:
RII: JP0 50 295 South Carolina Electric and Gas Co=pany ATTS:
M. C. Johnson, Vice President Special Services and Purchasing P. O. Box 764 Columbia, SC 29218 Gentlenen:
to you for inferr2ticn.
';c -ri:ter The enclosed Bulletin 79-13 is forwardeu response is required.
If you desire additiana. inf r.ition regarding :.s catter, please contact this office.
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Enclosures:
1.
IE Bulletin ';o.
79-13 2.
List in;; of IE Bulletins Issued in '.as: !:
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South Carolina Electric and Gas Company cc w/ encl:
T. B. C o nn e r s, J r.
Conners, Moore and Cerber Nb 1747 Pennsylvania Avenue, Wasbingt on, D.C.
2000t A. A. Smith Quality Assurance Post Office Box 8 290t L Jenkinsville, South Caro!>na O. S. Bradham, Manager Nuclear Operations Post Office Bcx 8 290t/
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UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND Eb70RCEMDiT WASHINGTON, D.C.
20555 June 25, 1979 IE Bulletin No. 79-13 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circunatances:
Indiana and Michigan n'ower Company notified the NRC of On May 20, 1979, their D. C. Cook Unit 2 facility. Re cracking in two feedvater lines at cracking was discovered f ollowing a shutdown on May 19 to investigate leakage identified in the inside c ontainment. Leaking circumferential cracks were to two stes= generator nozzle elbov velds.
16-inch feedvater elbows adjacent indications in all eight radiographic examination revealed crack Subsequent this location on both Units 1 and 2.
stea= generator feedwater lines at to all FR licensees by the Office of On Ma y 2 5, 197 9, a letter was sent Nuclear Reactor Regulation which inf ormed licensees of the D. C. Cook f ailures fabrication, and requested specific information on f eedva ter systec design,To further explore t inspection and operating histories.
the cracking problem, the Of fice of Inspection and Enf orcement requested volumetric licensees of PWR plants in current outages to immediately conduct eaarination of certain feedvater piping welds.
several other licensees with Westinghous e steam As a result of these actions, Southern California Edison reported on generators reported crack indications. radiographic examination revealed indication June 5, 1979, that in feedvater nozzle-to-piping velds on two of three steam generators of San Onofre Unit 1.
On June 15, 1979, Ca rolina Power and Light repor ted that their H. E. Robinson radiography showed crack indications in similar locations at Unit 2.
Duquesne Power and Light confirmed on June 18, 1979, that radiography I feedwater piping te vessel has shown cracking in their Beaver Valley Unit Public Service Electric and Cas Company reported on June 20, nozzle weld.
1979 that Sa lem Unit I also has crack indications. Wisconsin Public Service out a feedvater nozzle-to-pipe weld company decided on June 20, 1979 to cut As of f or metallurgical examina tien.
which contained questionable indication,seven other PWR facilities have inspected June 22, 1979 and since May 25, 1979 the feedvater nozzle-to-pipe velds without f inding 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-nozzle weld for D.C. Cook and San Onofre detail showing the principal crack locations joint u
are shown on the attached fig u
DUPLICATE DOCUMENT
.n On March 17, 1977, during hei tig',12@
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Unit 1, a leak was discovere.
Entire document previously entered the 16-inch diameter f eedwat' into system under-s nondes tructive examina tion o 3
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