ML19345A368
| ML19345A368 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 05/17/1976 |
| From: | French J YANKEE ATOMIC ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WYR-76-59, NUDOCS 8011210110 | |
| Download: ML19345A368 (4) | |
Text
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YANKEE ATOMIC El.ECTRIC COMPANY u,R,6-59 20 Turnpike Rood Westborough, Mossochusetts h1 g
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United Stares Nuclear Regulatory Cc= mission h
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20555 Attention: Office of Nuclear Reactor Regulation
Reference:
(a) License No. DPR-3 (Docket No. 50-29)
(b) YAEC letter, DJS to DEV, dated March 6, 1974.
81}FM (c) YAEC letter, DEV to DOL, dated September 13,19' / 7' s,
g (d)
_AEC letter, LHH to DOL, dated November 5, 197 s
(e) YAEC letter, LHH to DOL, dated January 13, 19 h,
l' (f) NRC letter, KRG to GCA, dated February 7, 19' d dl 1
(g) YAEC letter, JLF to DOL, dated March 31, 1975 2 t
(h)
YAEC letter, JLF to DOL, dated March 3,1976. U' h!
(i) NRC letter, RAP to RHG, dated May 3, 1976.
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Dear Sir:
Yankee Atomic Electric Company was requested in Reference (b) to investigate the consequences which could result frcm a dropped spent fuel shipping cask. The results of our investigation were submitted in References (c), (d), and (e), and provided all of the information that was available at the time. During a meeting with your staff on January 22, 1975, Yankee discussed its previous submittals and agreed to investigate the feasibility of incorporating a number of design features into the Yard Crane modifications.
Subsequent to that meeting, Reference (f) requested Yankee to submit the details of the Yard Crane modificatiens by March 28, 1975.
In Reference (g), Yankee indicated that the feasibility of the proposed modifications was still being evaluated. Details of the modifications were submitted as a point by point response to Branch Technical Position APCSB 9-1 in Reference (h).
Reference (i) requested additional information concerning the proposed modifications. That information is submitted in the attach-ment to this letter.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY S
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!<,., uu-p J. L. French Manager of Operations "p
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Attach ent 8011210//O
s ADDITIONAL INFORMATION
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YARD CRANE MODIFICATIONS
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YANKEE NUCLEAR P0k'ER STATION (YANKEE-R0k'E)
DOCKET NO. 50-29 1.
A.
NRC OUESTION:
Clarify your discussion on main hoist motor sizing with respect to removing the main hoist motor for the 100-ton capacity and replacing it with a smaller motor.
Show that the new motor will be sized for-the'50-ton Design Rated Load (DRL) in accordance with applicable sections of APCSB 9-1.
B.
YAEC RESPONSE:
(1) The section of ADCS3 9-1 which discusses main hoist motor sizing is paragraph B.3.1 which states the following:
To preclude excessive breakdown torque, the horsepower rating (HP) of the electrical motor drive for hoisting should provide no more than 110 percent of the calculated HP requirement to hoist the design rated load at the maximum design hoist speed.
(2) Our previous response to this requirement stated the following:
The horsepower rating of the motor will be limited as nearly as practical to 110 percent of the calculated HP requirement to hoist the design rated load at the maximum design hoist speed. Acceleration requirements and available motor frame sizes may affect the choice.
(3) The size of the new motor will be determined for hoisting the 50-ton DRL at the maximum (5 fpm) design hoist speed.
This
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calculated size must, however, also include acceleration t
considerations. The vendor of this crane equipment has deter-mined that the selection of a motor without accounting for acceleration requirements could result in no motion of the-DRL in hoisting until almost full speed torque is called for by the master device at the operator's station. Motor over-heating could result from the extended operation at slow speed caused by low acceleration rates.
Since motors are manufactured in discrete sizes, the next largest size to that determined above will be chosen. Agcin, 4
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it is our intention to limit the hosepower rating as nearly as practical to the 110 percent requirement.
2.
A.
NRC QUESTION:
Provide a discussion on the limit controls which will prevent -
the crane from passing over stored fuel while carrying the spent fuel cask.
Include the nu=ber, type, and location of controls, as well as information on any of the administrative controls which may be required.
B.
YAEC RESPONSE:
It is our intent to prevent the crane from passing over stored fuel while carrying the spent fuel cask by strict administrative controls.
All cask handling operations will be under the direction of a responsible member of the Yankee Rowe staff specifically appointed for this task. The crane operators will be qualified to meet the requirements of ANSI B.30.2 and all cask handling operations will be carried out in accordance with written instructions and with appropriate check off sheets.
Pre-lift maintenance check-offs will be performed to insure proper crane operation.
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NTIC DISTI(ICUTION ron PAllT 50 DCCKET t.1ATEltl AL i-itoM:
Yankee Atomic Elec. Co.
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ENCLo0VHE Addl Info on Yard Crane Medifications I
for.the Yankee Rowe Plant....
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