ML19247A356
| ML19247A356 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 06/25/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stampley N MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 7907310024 | |
| Download: ML19247A356 (2) | |
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NUCLE AR REGUL ATORY COMMISSION
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JUN 2 51Q79 In Reply Refer To:
RII:JPO 50-416 50-417 111ssissippi Power and Light Company ATU :
N. L. Stacpley Vice President of Production P. O. Box 1640 Jackson, MS 39205 Gentlemen:
The enclosed Bulletin 79-13 is fersarde. te
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Sc sri:ttr response is required.
!f you desire add:t2;na. it.fc r.11 :an regarding :..,
=atter, p' ease contact this of: at.
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Enclosures:
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Mississippi Power saa light Company cc w/cocl:
C. K. McCoy Plant Manager Post Office Box 756 Port Gibson, Mississippi 39150 b[i C;.idNbiNk g
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UNITED STATES NUCLEAR RIGULAIDRY COMMISSION OFFICE OF INSPECTION AND ENFORCDG2iT WASHINCION, D.C.
20555 June 25, 1979 IE Bulletin No. 79-13 CRACKINC IN FEEDWATER SYSTEh PIPING Description of Circumstances:
Indiana and Michigan Power Company notified the NFC of On May 20, 1979, their D. C. Cook Unit 2 facility.
He cracking in tso feed ster lines at cracking was discovered f ollowing a shutdown on May 19 to investigate leakage inside containment. Leaking circumf erential cracks were identified in the to two stes= generator nozzle elbcw welds.
16-inch feedwater elbows adjacent in all eight radiographic examination revealed crack indications Subsequent steam generator feedwater lines at this locatien on both Units I and 2.
to all PVR licensees by the Of fice of On May 25, 1979, a letter was sent C. Cook failures Nuclear Reactor Pegulation which inf ormed licensees of the D.
and reques ted specific inf ormation on f eedvater syste design, f abrication, inspection and operating histories. To further explore the generic nature of the crack ing probim, the Office of Inspection and Enforcement requested outages to immediately conduct volumetric licensees of PWP plants in current examination of certain f eedwater piping welds.
several other licensees with Westinghouse steam As e result of these actions, Southern California Edison reported on generators reported crack indications.
June 5, 1979, that radiographic examination revealed indications of cracking in feedvater nozzle-to-piping welds on two of three steam generators of San Onof re Unit 1.
On June 15, 1979, Carolina Power and Light repor ted that their H.
5.
Robinson radiography showed crack indications in similar locations at Unit 2.
Duquesne Power and Light cortfirmed on June 18, 1979, that radiography has shown cracking in their Beaver Valley Unit I f eedvat er piping to vessel Public Service Electric and Cas Company reported on June 20, cozzle weld.
1979 that Sa lem Unit I also has crack indications. Wisconsin Public Service out a f eedwater nozzle-to-pipe veld cecpany decided on June 20, 1979 to cut which contained questionable indication, f or metallurgical examina tion.
As of June 22, 1979 and since May 25, 1979 seven other PWP f acilities have inspected the feedwater nczzle-to-pipe welds without finding cracking indi:ations.
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 eedwa ter pipe-to-nozzle weld Cook and Saa Onofre detail shouing the principal crack locations f or D.C.
joint
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are shown on the attached
[ DUPLICATE DOCUMENT inyon On March !7, 1977, during d ng Unit 1, a leak was discov.
Entire document previously entered the 16-inch diameter f eed' into system under:
inics nondestructive examina tio
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