ML19210C123

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Forwards 10 Photographs Taken During Util Insp of 791002 Steam Generator Tube Rupture.Photographs Show Location of Springs & Eroded & Ruptured Tubes.Addl Photographs on File at Plant
ML19210C123
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 11/06/1979
From: Mayer L
NORTHERN STATES POWER CO.
To:
Office of Nuclear Reactor Regulation
References
TAC-12237, NUDOCS 7911130306
Download: ML19210C123 (12)


Text

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NiiiP NORTHERN STATES POWER C O F. PANY M O N N E A PO LI S. M O N N E S OTA 55401 November 6,1979 Director of Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 PRAIRIE ISIAND NUCLLAR GENERATING PiANT Docket No. 50-282 License No. DPR-42 50-306 DPR-60 Transmittal of No. 11 Steam Generator Tube Inspection Photographs NSP and Westinghouse representatives met with the NRC Staff on October 12, 1979 to discuss the Prairic Island No. 11 Steam Generator tube rupture of October 2, 1979. NSP offered to transmit several sets of selected photo-graphs taken during the steam generator inspection. The NRC meeting minutes requested three copies of pertinent pictures which show the loca-tion of springs, eroded and ruptured tubes, etc.

Enclosed are three sets of ten different photographs which show the significant observations made, and items found, during the inspection.

Additional photographs are on file at the plant for inspection. The enclosed photographs have been numbered and a brief description of each follows:

Picture No. Description 1-18A Views of tubes #3 and #4 on the hot leg side of the tube lace blocking device.

1-20A View of tubes #1, #2, and #3 on the hot leg side of the tube lane blocking device.

2-15 View of ruptured tube (#4).

2-24 View of spring on hot leg side of tube lane blocking device prior to tube lane blocking device removal. Also shows the first six tubes.

3-10A View of second spring and hose clamp on cold leg side of tube lane blocking device prior tu tube lane blocking device remove. l .

Note: Color difference is because the photograph is in black and white.

7011130 306 1320 156

, NORTHERN STATES POWER COMPANY November 6, 1979 Page PictureJg Description 5-8 View of both springs and hose clamp after tube lane blocking device was removed.

5-10 View of spring (cold leg side) and tube sheet wear marks from spring on hot leg side of tube lane biccking device af ter tube lane blocking device was removed.

5-12 Some as 5-10, except that the view includes more tube sheet wear marks.

1-S View of both springs and hose clamp af ter removal from steam generator.

2-S Same as 1-S cxcept somewhat different angle of view.

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Y L 0 Mayer, 1 Manager of Nuclear Support Services LOM/jh cc G Charnoff (w/o enclosure)

J G Keppler (w/o enclosure)

MPCA Attn: J W Ferman (w/o enclosure) enclosure 1320 157