ML19270H410
| ML19270H410 | |
| Person / Time | |
|---|---|
| Site: | MIT Nuclear Research Reactor |
| Issue date: | 07/06/1979 |
| From: | Lisa Clark MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE |
| To: | Doug Garner Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7907110528 | |
| Download: ML19270H410 (1) | |
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NUCLEAR REACTOR LABORATORY
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M ASS ACHUSETTS INSTITUTE OF TECHNCLOGY
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<61 n 253-4202 0'+ o : o ' """ 0' U " " " 5 July 6, 1979 U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Attn:
Mr. Daniel Garner Division of Operating Reactors, Branch 4 Washington, D. C.
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Dear Mr. Garner:
Enclosed is a copy of the July 2, 1979 report recently sent to Region #1 concerning Reportable Occurrence #50-20/79-4. As you suggested, copies have been nt to the Missouri and Michigan research reactors, since they 'se eimilar fuel. A copy of my forwarding letter to those faci.1*:les is also enclosed, since it contains additional information that may be of interest to you.
Sincerely, li DN LC/pk Lincoln Clark, Jr.
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NUC' rAR REACTOR LABORATORY l
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MASSACHUSETTS INSTITUTE OF TECHNOLOGY
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- :.. _, s 138 Albany Street Ca :-dge f.iass C2139 L CLA W,JR tsi 7, 253-4202 Da"m' c' Paco' op"*?'*a5 July 2, 1979 Mr. Boyce H. Crier, Director U. S. Nuclear Regulatory Commission Region #1 631 Park Avenue King of Prussia, PA 19496 Attn:
Mr. E. Stetka, Peactor Inspector Re: Reportable Occurrence 50-20/79-4, License R-37 Apparent Fuel Element Cladding Failure Gentlemen:
Massachusetts Institute of Technology hereby submits this 10 day report of an occurrence at the MIT Research Reactor in accordance with Paragraph 1.15.4 of the Technical Specificetians. An initial report was made by telephone to
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Region #1 on_ June 22, 1975.
The format of this report is based on Regulatory Guide 1.16.
1.
Report #50-20/79-4 2.
a)
Report date: July 2, 1979 b)
Occurrence date: June 22, 1979 3.
Facility: MIT Research Reactor 138 Albany Street Cambridge, Massachusetts 02139 4.
Identification of Occurrence: An increase to 20 - 25% of the maximum permissible concentrations (MPC) for gaseous fission products, as compared to the 1 - 5% of MFC normally experienced as the result of diffusion through the aluminum cladding, was interpreted as an indication of a possible fuel element cladding failure, and the reactor was shut down for the purpose of identifying and removing the potentially faulty element.
5.
Conditions Prior to Occurrence:
In the course of normal, fullg pyerm,gummom, operation during the period of May 2W"~'"""~'"""'
monitor sampling core purge gas fro: DUPLICATE DOCUMENT tank lid indicated an increase in LF Entire document previously entered
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into system under:
ANO Y b No. of Pages: _
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