ML20004F917
| ML20004F917 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 06/23/1981 |
| From: | Colbert W DETROIT EDISON CO. |
| To: | Kintner L Office of Nuclear Reactor Regulation |
| References | |
| EF2-53864, NUDOCS 8106260182 | |
| Download: ML20004F917 (2) | |
Text
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re.4ega4h16 (313) 237-8000 June 23, 1981 EF2 - 53864 g
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Mr. L. L. Kintner 7
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Dj Division of Project Management Office of Nuclear Reactor Regulation A
pf U. S. Nuclear Regulatory Ctanission N$
Dear Mr. Kintner:
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Reference:
' Enrico Fermi Atcznic Power Plant, Unit 2 NRC Docket No. 50-341
Subject:
Details re: Handling Items in Spent Fuel Pool During a telecon on May 25, 1981, Fred Clemenson (NRC) requested the following additional information regarding light loads carried over fuel:
1.
What is lifting capacity of devices (cranes) carrying these items?
2.
Describe safety features on all books and other lifting devices.
3.
Give the value of either safety margin or ultimate limit on all lifting bails.
4.
Describe qualifications for operators of cranes and lift-ing devices.
lu:5PONSE:
1.
The fuel bundle is carried on the fuel grapple which is attached to the main trolley of the refueling platform.
'Ihe balance of the equignent is carried by specific grapples dedicated to an individual item such as the control blade. They are suspended from either the attdliary hoist on the Refueling Platform main trolley or on the nonorail mounted auxiliary hoist.
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6-Mr. L. L. Kintner June 23, 1981 EF2 - 53864 Page 2 The lifting capacity of all grapples is based upon a 5 to 1 safety factor based upon the ultimate s:rength of the material. The fuel grapple is limited in practice to approxi-mately 1,000 lbs. by load cell settings and the remaining i
hoists to 500 lbs. maximum load cells.
2.
The refueling grapple uses a single hook which captures the lifting bail. The bail is then totally enclosed in the grapple head. A microswitch is used to c/.atain an indication that the fuel bail is enclosed in the grapple head. The
, general purpose grapple typically attached to the jib crane uses dual books to attach to the bail of the cxmponent be-ing lifted. All screwed connections between hoist cable and grapple are pinned in place.
Se actuating pole is carried about by the refuelig crew and quite often is tied off to the pool railing.
3.
The safety margin used is 5 to 1 based on material ultimate strength..This is a typical industry standard, and can be found in Crane Manufacturer Standard CM%-70.
m ere are no other items which are expected to be carried os ir the pool which have significant kinetic energy conpared to a fuel assembly.
4.
All manipulations carried on in the spent fuel pool shall be observed and directly supervised by either a licensed Senior Reactor Operator or Senior Reactor Operator Limited to Fuel Handling who has no other concurrent responsibilities during this operation. This supervisor will have received training appropriate to this task. The training includes thorough instructions in precautions and safety while operati.J all devices, in procedures which minimize carrying items over spent fuel, and in responses to malfunctions, emergencies, and accidents.
Sincerely, ikhb W. F. Colbert r.
Technical Director Enrico Fermi 2 klD hT,/MTB/dk
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