ML20236T954

PN-75-042-1:util Reported Preliminary Results of Insp of Ten Spent 7X7 Fuel Bundles Previously Identified as Fuel Leakers.Bundles Being Examined & Results Will Be Reviewed W/Ge

ML20236T954
Person / Time
Site:	Monticello
Issue date:	07/01/1975
From:	Jennifer Davis, Thornburg H, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PN-75-042-1, PN-75-42-1, NUDOCS 9807290194
Download: ML20236T954 (1)

Text

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PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE July 1, 1975

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PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE --PN-75-42 -1 i+ )

This' preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically all that is known by OIE staff as of 11:00 a.m. on date of this notification. IT SHOULD BE SPECIFICALLY NOTED THAT THIS NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO BE. INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND EhTORCEMENT

~ NOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) SUBSEQUENTLY fJlLL BE ISSUED IF WARRANTED.

c. c . . . .. .

Facility: Monticello

Subject:

CRACKED FUEL PINS IN SPENT FUEL ASSEMBLIES

• w Northern States Power Company reported preliminary results of their inspection of ten spent 7 x 7 fuel bundles which had previously been identified as fuel leakers. Three of the ten fuel bundles were discharged i l from the core in March 1974 while the other seven bundles were discharged l in January 1975. All of the outside pins of Lach bundle were examined l

visually using a TV camera. Preliminary results indicate longitudinal  !

, _ cracks in the cladding were observed in approximately 30 of the 40 corner .N l pins. These pins contain low enrichment fuel - 1.13%. The cracks vary '

in length from one inch to three fee't long with a maximum wid,th approxi-( mately k inch. The fuel pins in the other peripheral positions did not  ;

show any significant cracking. '

The licensee 'is continuing examination of the 10 fuel bundles and plans to review the results with General Electric.

IE:III has scheduled an inspection for July 8 to review the licensee's results to date and visually examine the defective fuel.

OIE (Region III) received notification of this occurrence by telephone from C. Larson, Plant Manager at 11:30 a.m. on 6/30/75.

A press release is not planned. f /

Contact:

RFWarnick, IE x7261 HDThornburg, IE x7353 JGDavis, IE x7541 i Distribution:

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Chairman Anders Commissioner Mason S. J. Chilk, SECY .

I Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE D M

Commissioner Kennedy -- C. C. Kammerer, CA , ,

l L. V. Gossick, EDO D. F. Knuth, IE J . A. Harris , PA B. C. Rusche, NRR H. H. Brown, ISP T. J. McTiernan, AIA K. R. Chapman, NMSS H. K. Shapar, ELD

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PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE 9907290194 750701

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