ML19339A064
| ML19339A064 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 10/28/1976 |
| From: | Heider L YANKEE ATOMIC ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WYR-76-110, NUDOCS 8010310701 | |
| Download: ML19339A064 (3) | |
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Telg hon, 617 366-90l!
7 0 390 0739 YANKEE ATOMIC ELECTRIC COMPANY s,
AL 20 Turnptke Rood Westborough, Massochusetts 01581
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October 28, 1976
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.j NOV 11976;> IO United States Nuclear Regulatory Commission Washington, D. C.
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ud. vemu ny3 f.g cswiss M Lra Attention: Office of Nuclear Reactor Regulation
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Reference:
(a)
License No. DPR-3 (Docket No. 50-29)
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(b)
Letter, D. E. Vandenburgh, Yankee Atomic Electric Company t6 NRC dated September 25, 1975; Proposed Change No. 131.
Dear Sir:
This letter is in response to your questions concerning the installation of the new spent fuel racks at Yankee Rowe (Referen:e b).
In order to install the new spent fuel racks the roof hatches over the spent fuel pool must be removed. The maximum weight of any one hatch is approximately 1800 lbs.
The hatches are rectangular in shape and have a lifting eye in each corner. Procedural control will be instituted to ensure proper handling of the hatches. The procedure will incorporate the following:
a)
A crane with at least a five ton capacity will be used.
b)
Two independent lif ting slings each with a rated capacity of five tons will be used. Each sling will attach the crane hook with two of the lifting eyes on the hatch, c)
The hatches will not be lifted more than two feet above the spent fuel pool roof.
//-/- 74 An analysis was performed concerning a " drop rack accident".
N INPUT DATA Drop Height 52 feet
.s Weight of Rack 12,600 lbs 1.0 Drag Coefficient 2
Drag Area 26.9 ft 3
Rack Stiffness 5.58 x lg kip /ft 3.0 x 10 kip /ft Floor Stiffness 801031070[
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- Unitzd States Nuclear Ragulatory Commission October 28, 1976 Attn Office of Nuclear Reactor Regulation Page Two i
RESULTS l
Velocity entering Water 33.1 ft/sec 17.7 ft/sec Velocity at Impact 61 kip /ft Energy at Impact 4
The above data indicates that the rack is approximately 500 times more flexible than the floor.
It is obvious that virtually all of the impact energy will be absorbed by the deformation of the rack. Therefore no detrimental effect will occur to the pool floor by a dropped rack.
Per your requirement, we are presently evaluating an inspection procedure for in-situ testing for poison material in our racks. Upon completion of our experiments we will submit a written procedure out-lining our inspection plan.
We trust you will find this information satisfactory; however, should i
you desire additional information, please contact us.
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Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY f"
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L. H. Heider Assistant Vice President TMC/kg
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DATEOr DOCUMENT Yankee Atomic Electric Company 10/2S/76 N. R. C.
Westborough, Mass DATE RECEIVED L. H. Heider 11/1/76
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DESCRIPTION E N C LOSU RE Ltr. re their 9/25/75 ltr....cc=.cning installa tion of the neu spent fuel racks at. Yankee Ro'e.
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