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Jersey Central Power and Light Company Docket No. 50-219 Attention:
Mr. R. H. Sima Vice President Madison Avenue at Punchbowl Road Morristown, New Jersey 07960 Gentlemen:
A letter to the Directorate of Licensing, AEC, from the Vermont
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i Yankee Nuclear Power Corporation, dated March 6, 1973, was recently placed in the'Public Document Room. The subject matter discussed in that letter is felt to have possible I
applicability to your plant, and, accordingly, I.have enclosed I
a copy for your information.
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Sincerely, rI".... ~,,'l l
Robert T. Carlson, Chief i
Facility Operations Branch j
Enclosure:
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Letter, VYNPC to the Directorate of Licensing, dated March 6, 1973 cc:
Mr. T. J. McCluskey, Station Superintendent l
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P. O. DOX 157 VERNON. VERMONT oS354 March 6, 1973 Director Directorate of Licensing-United States Atomic Energy Commission Washington, D.C.
20545
REFERENCE:
Operating License DPR-28 Docket No. 50-271 Dear Sir During our recent fuel reconstitution an incident occurred which we feel should be reported in accordance with Technical Specifications for the Vermont Yankee Nuclear Power Station, Section 6.7.C.
At do, un reoruary 5,1973, tne all-purpose tuel grapple became detached f ron the jib crane hoist cable when tension was applied to the cable.
The grapple was attached to a fuel element at the time.
The fuel element was observed to remain seated in the fuel rack when the cable end stud pulled free of the grapple body. This incident attains greater significance when viewed in the context of having been preceded by numerous fuel moves.
The grapple was recovered and investigation revealed that the cable end stud was intact, its threads were undamaged, and that the locknut was present and could be threaded easily the length of the stud.
i Additionally, it was observed that a hole was provided in the side of the body of the grapple to permit insta11arien of a pin but that a pin had l
never, in fact,.>een installed nor was it called for by vendor dra*.ing.
1 It was concluded that the separation of stud and cabic came about through l
the repeated slight twisting of the cabic caused by a non--symetrical rotation of the all-purpose grapple during attachment and removal.
Thegrappleandcab1$endstudwerereassembled,theendstuddrilled, and a roll pin installed and staked.
The cabic was inspected and no signs
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of deterioration were found.
The grapple assembly was then verified to be operabic by lifting a fuel element under close observation while it remained in the storage rack.
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VCRMONT YANK"
'NUCLCAR POWCR COftPORN e,
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. Directorato'of Licensing
. March 6, 1973
. Page 2 i
^The Plant Operations Review Comnittee concluded; that the-insta11ation'of
- a. roll pin in the grapple / cable end stud ussembly uill prevent recurrence of u
this problen.. use of the' jib it:1ediaccly _ af ter repair was reasonable, and the future use of. the jib crane to move fuel has-been adequately safeguarded.
'Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION
%.DO, Elus m-B.W. Riley 4
Plant. Superintendent i.
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