ML20148J442
| ML20148J442 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 12/05/1972 |
| From: | Kruesi F US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Minnick L YANKEE ATOMIC ELECTRIC CO. |
| References | |
| NUDOCS 8011240105 | |
| Download: ML20148J442 (1) | |
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i Docket 50-29 k
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T THIS D0CUMENT CONT R
Yankee Atomic Electric Co:npany POOR QUAUTY PAGES*
ATn:: ur. L. t. ninnieu L
Vice President J
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20 Turnpike Road Ucstboro, thssachusetts 01581 2
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This will acknowledge receipt of the letter from
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Ur. Herbert A. Autio dated November 20, 1972, k
reporting damage to a fuci element on October 30, j
1972. This matter vill be exe.ined during the g
next inspection of your facility.
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Your cooperation with us is appreciated.
Very truly yours, cp
.:Ay.
Et F. E. Kruesi, Director of f
Regulatory Operations 4
pl bec w/ letter 11/20/72 Y
A. Gia:busso, L Local PDR
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J. M. Hendrie, L PDR P. A. Morris, RO NSIC q
D. J. Skovholt, L DTIE
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R. H. Engelken, R0 DR Reading File i
H. D. Thornburg, R0 DR Central File f
R. Schetel, L Incident File (H. Semmes)
J. P. O'Reilly, RO:I J. G. Davis, RO:II E.1 Grier, RO:IIT f
J. W. Flora, RO:IV N,
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R. W. Smith, RO:V C. F. Eason, AWCRR (2) yi J. G. Keppler, R0 2;
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ROWE, MASSACHUSETTS '01367 Q.
November 20, 1972 i
s United States Atomic Energy Commission Kashington, D. C.
20545 Attention: Directorate of Regulatory Operations
Reference:
License No. DPR-3 (Docket No. 50-29) i
Dear Sirs:
Relative to the reporting requirements specified in i
10 CFR 20 Part 20.403 (b) (4), Yankee Atomic Electric Company - Rowe J
reported damage to a fuel assembly both verbally and in writing on October 31, 1972.
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The following written report is submitted in accordance I
with 10 CFR 20.405.
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h" nile removing the upper core barrel on October 30, 1972 lA Zircaloy fuel assembly A-421 was picked up from core position D-9 and raised with the upper barrel. The fuel assembly was lifted to approximately 8 feet above the top of the core.
l Folluing evaluation of the problem, a decision was made to attempt reinsertion of the assembly into its core position.
kf;1 During this reinsertion the fuel assembly was dislodged from the upper i
core support plate, falling a maximum of several inches.
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.:a Tne upper core barrel was removed by normal procedure follow-E ing verification that fuel tube rupture had not occurred. The A-421 assembly was observed to be in a near vertical position, resting on j
the core adjacent to its original position.
The upper nozzle was lean-g ing against the lower core barrel.
c-A manual handling procedure and tools were used to transfer 2
~ the assembly to the fuel chute carriage and then to the spent fuel pit, y
A similar ma.ual handling procedure was used for transfer to a spent 4
fuel pit rack position.
Subsequent examination confirmed damage to the upper nozzle f
and the upper assembly wrapper sheet.
This fuel assembly will not be
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reused.
i The cause for the fuel assembly hang-up has not been deter-Q; mined.
It is postulated, however, that a small foreign object may have L.M '
lodged between the upper nozzle and the core support plate locking the assembly in place.
This object would also have dislodged when the y%
assembly released.
Some foreign material was noted later in this general area during fuel unloadin Marks on the upper core support plate noted j
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Q in a.later inspection, appear to confirm this diagnosis.
The possibility of upper fuel nozzle distortion during core gf-
. operation was considered. The remaining'75 upper nozzles were gaged
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with no distortion being found.
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' Based on the above inspections and contemplated procederal l 4 changes, Yankee Atomic - Rowe is confident that a fuel assembly hang-up o J.;. l will not occur during future upper barrel withdrawals.
- j el Yankee - Rowe also wishes to correct the 24 ho'ur report of October 31, 1972 to Region I describing this incident as Abnormal
~c Occurrence 72-20.
It has been determined that this incident falls with-in reporting requirements but is not defined as a plant abnormal y
1 occurrence.
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Very truly yours,
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i Herbert A. Autio
-l Plant Superintendent 2
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