ML20085K977
| ML20085K977 | |
| Person / Time | |
|---|---|
| Site: | University of Iowa |
| Issue date: | 10/25/1991 |
| From: | Danofsky R IOWA STATE UNIV., AMES, IA |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 9111010168 | |
| Download: ML20085K977 (7) | |
Text
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. w Iowa STATE UNIVERSITY Dconuncnt of Mu:"hanut 1 ngine O l' S C l l N C I: A N D 'l L C il N O L O G Y ggy g ny Niu har i ngwenng ish Anu s, laa soon za 3o Docket No. 50-116 sn an5No October 25, 1991 Regional Administrator Region III Nuclear Regulatory Commission 799 Roosevelt Road '
l Glen Ellyn, IL 60137
SUBJECT:
Special Report of Roll pin Cracking Found in the Fuel Handling Cones at Iowa State University's UTR-10 Reactor
Dear Sir:
This is a written transcript of the information provided to NRC Region III on October 24, 1991, of roll pin cracking which was observed on October 23, 1991.
Special Report Transcript:
In accordance with the requirements of paragraph 6.6.2 of the Technical Spacifications of license R-59, we are making this special r, port to the NRC.
While performing a low e riched uranium (LEU) fuel element inspection a hairline crack was noticed in the 1/4" x 2" stainless steel roll pin which is pressed into the fuel element handling cone. The roll pin and cone combination provide a means of mating the fuel handing touls of the fuel element. The roll pin supports the weight of the fuel element during insertion and removal operations. Failure of this roll pin while handling fuel could result in a dropped fuel element and mechenical damage of the fuel cladding. Reactor management determined that an inspection of the remaining 11 elements was necessary. The remaining 11 elements were inspected on October 24, 1991, and all exhibited similar cracking.
The cause of the cracking is unknown at this time. Reactor operations have been suspended while the cause of the pin cracking is determined and an appropriate replacement for the roll pins is identified and installed. The ISU UTR-10 Reactor Use Committee has been informed.
End of Transcript.
This notification was made by telephone to the URC Region III at 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on October 24, 1991, by John T. Adams, Reactor Supervisor.
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Questi'ons may be directed to Dr. Richard llendrickson, Reactor Manager at (515)294-6422 or (515)233-1248, or to John Adams, Reactor Supervisor at (515)294-0539.
Sincerely, Richard A. Danofsky 1h Facility Director RAD /rp Enclosure cci Charles Cox, NRC Region III Ted 11. oklishi, Chairman, Mechanical Engineering Department Richard Ilendrickson, Reactor Manager Tom L. Zimmerman, Chairman, Reactor Use Committee US NRC Document Control Desk i
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"'****N'* Cor..ponent Name Identification 835-001 P.O. Nvmbet Drawing 431708
'SS Roll' Pins:'
Part No. 92383A464 TRTR-21. Revision 0, dated 8/20/90 N/A r ,
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Size: I" s dia. x 2" ig.
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