ML20041C402
| ML20041C402 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 02/25/1982 |
| From: | Dale L MISSISSIPPI POWER & LIGHT CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20041C403 | List: |
| References | |
| REF-GTECI-A-36, REF-GTECI-SF, RTR-NUREG-0612, RTR-NUREG-612, TASK-A-36, TASK-OR AECM-82-17, NUDOCS 8203010282 | |
| Download: ML20041C402 (6) | |
Text
..
y amt--};
MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 164 0 J A C K S O N, MISSISSIPPI 39205 NUCLEAR pro 0UCTioN DEPARTMENT ft)
O U. S. Nuclear Regulatory Commission RECgygD
'.7 Office of Nuclear Reactor Regulation d'
Division of Licensing 2
M.9 Oj b
g 88 eat g, Washington, D. C.
20555
- ~
Attention:
Mr. Darrel G. Eisanhut, Director O
Dear Mr. Eisenhut:
O 6
SUBJECT:
Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416 and 50-417 File 0260/16360 Control of Heavy Loads AECM-82/17 This letter is being sent to you to supply certain corrections to the Heavy Load Report submitted to your office with AECM-81/427 dated November 23, 1981.
In that report our plant specific definition of a heavy load was changed from 750 pounds to 1140 pounds or from the weight of a channeled fuel assembly to the weight of a channeled fuel assembly plus its associated handling tool as defined in NUREG-0612.
The change was made in Footnote 1 of Table 4 on page 18 and in the proposed Technical Specifications for the fuel storage fuel pools, 3/4.9.7, and Jib crane, 3/4.3.13.
However 1140 pounds is greater than the rated capacity of the Jib crane, (15 ton), therefore since the limitation to 1140 pounds is meaniagless, the latter technical specification is being deleted.
Reference to the proposed Jib crane Technical Specification is also being deleted on page 10.
Two more references to the heavy load definition have been changed. On the attached replacement to page 12 the words "and its associated handling tool" are added to Footnote (1) and on the attached replacement to page 15 in the New Fuel Bridge Crane paragraph, 750 has been changed to 1140 in line six.
Attached are the required replacement pages.
Instructions for revision of the Grand Gulf six months Heavy Loads report are as follows:
Remove Replace With Page 10 Page 10-Rev. 1 Page 12 Page 12-Rev. 1 Page 15 Page 15-Rev. 1 Page 18 Page 18-Rev. 1 Technical Specifications f
3/4.9.7 3.4.9.7 Rev. 1 3/4.9.13 (2 pages) delete 8203010282 B20225 Member Middle South Utilities System PDR ADOCK 05000416 s
m
AECM-82/17 MISSISSIPPI POWER & LIGHT COMPANY Page 2 If you have any questions please advise.
Yours,truly,
~
W
'L. F. Dale Manager of Nuclear Services PJR/JDR:ph Attachments cc:
Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. G. B. Taylor Mr. Richard C. DeYoung. Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 i
y r
S.
The Spent Fuel Pool Cooling Heat Exchanger Monorail may be excluded from consideration because there is no safe shutdown equipment below or in proximity to this monorail. The monorail only operates at one end of the fuel pool coolers and connot'corry a load over the coolers.
The Jib Crone in the containment may be positioned at any of three different locations along the west side of refueling canal and is used for handling smaller loads in this oreo near the in-containment fuel storage rocks. The Jib Crone in the auxiliary building may be positioned at any of four locations along the spent fuel pool.
These jib crones are used for handling channel assemblies, control rods, guide tubes, and other loods that are lighter than a fuel assembly plus its handling tool.
e i
Separate small crones (6-fon capacity) are located above each Diesel Generator Unit to assist in servicing these units. The crones are only used when the diesel has been removed from service and requires sorne maintenance or repair. Since the only equipment in a diesel generator compartment is associated with that diesel, a load drop from one of these crones would therefore not cause operable safe shutdown equipment to become inoperable.
Finally, the monorails for the Standby Service Water Pump Houses are used for removing roof hatches to provide access for removal of standby service water pumps or motors. Two pump houses are provided, each containing pumps for only one safety division. The monorails would only be used for servicing equipment ihot is removed from service for maintenance or repair. Therefore, a load drop from one of these monorails would not cause operable safe shutdown equipment to become inoperable.
Rev. I 10 2/10/82
l TABLE 3 (continued) l Heavy LoadI andling Situation Safe Load Path / Procedural Actions Required H
Safety Class 2. Lood could be 2.
Procedurally define on area over which
-carried directly over spent fuel, foods shall not be corried so that if the reactor vessel, or safe shut-lood is dropped, it will not result in down equipment, i.e., lood con be damage to spent fuel or operable safe handled during the time when shutdown equipment or compromise spent fuel or the reactor vessel is reactor vessel integrity.
exposed or safe shutdown equipment is required to be operable and there are no physical means (such as interlocks or mechanical stops) available to restrict load move-ment over these objects.
Safety Class 3. Lood con be 3.
See 3A and 38.
corried over spent fuel or safe shutdown equpment, but the fuel or equipment is not directly exposed to the load drop, i.e.,
intervening structures such as floors provide some protection.
Safety Class 3A.
3A. No load travel path is required at this Preliminary evaluation indicates time. General precautions limiting that intervening structures will locd travel height is prudent.
protect spent fuel or safe shut-down equipment.
Safety Class 38.
- 38. Define safe load paths that follow, to Preliminary evaluation con not the extent practical, structuro! floor conclusively demonstrate that members. Limit food travel height intervening structures will to minimum height practical.
protect fuel or safe shutdown equipment.
Safety Choss 4. Load connot be 4.
No safe food rath required.
corried over spent fuel or over safe shutdown equipment when such equipment is required to be operable, i.e, design or opera-tional limitations prohibit movement.
I A heavy lood is defined as a load that is greater than the weight of a channeled.j fuel ossembly and its associated handling tool.
Rev. I 12 2/10/82
- =.=
SPENT FUEL CASK CRANE The discussion regarding the Spent Fuel Cask Crone in item I indicated that this 4
crone lies been designed to " Single Foilure Proof Critiero." Further, the crane rolls do not extend over any portion of the Spent Fuel Pool. Administrative controls limit the cask (the principal lood of interest) from being raised more than 6 inches above the operating floor and redundant limit switches prevent the cask from being raised more than one foot.
Because the design of the " Spent Fuel Cask Crone" provides substantial lood handling reliability, detailed safe lood paths were not judged to be required and therefore none are proposed here. Nonetheless, prior to undertaking any cask handling operations, detailed handling procedures will be developed taking into consideration the guidelines of NUREG 0612.
NEW FUEL BRIDGE CRANE The concern with the New Fuel Bridge Crone is the possibility of carrying loods over spent fuel in the spent fuel pool.
There are no physical or design restrictions that prevent this crone from moving over the pool.. Accordingly, all of the heavy loads listed in Toble 6 for this crone have been assigned to Sofety i
Class 2.
To oddress this concern, proposed Technical Specification 3/4.9.7 (ottoched) prohibits foods in excess of 1,140 lbs. from being corried over j
irrodioted fuel in the spent fuel pool. Further, the plant procedure governing operation of the New Fuel Bridge Crone includes precautions and guidance related to meeting this Technical Specification.
MONORAIL / HOIST FOR LPCS AND RHR"C" HATCHES The safety concern posed by this handling system is described in the response to item I as the potential for dropping a hatch cover or heavy piece of equipment onto cabling at the i19' elevation. To address this safety concern, the plant procedure governing lifts by this monorail / hoist system includes precautions to hoist operators that olert them to the concern and direct them to take extreme core to avoid impacting the cabling.
Rev. I 15 2/10/82
TABLE 4 (continued)
APPROX.
APPLICABLE SAFETY WElGHT LIFT LIFTING 9
LOAD CLASS (TONS)
PROCEDURES EQUIPMENT
- 10. RWCU Regenerative 2/3B 15 9/
Shockles and HX Hatches (2)
Slings i1. RWCU Non-Regenerative 2/3B 15-17 9/
Shockles and HX Hatches (3)
Slings
- 12. RWCU Filter Demineral-2/3B 20
-9/
Shockles and izer Hatches (2)
Slings 1.
A heavy load is defined as a weight exceeding the weight of a channeled fuel assembly and its associated handling tool (approximately 1,140 pounds).
2.
General Maintenance Instruction,07-S-14-184," Installation and Removal of the Reactor Vessel Head, Safety Related."
3.
General Maintenance instruction,07-S-14-186," Installation and Removal of the Reactor Moisture Separator, Non-Sofety Related."
4.
General Maintenance Instruction,07-S-14-187," Installation and Removal of the Portable Refueling Shield (Cottle Chute), Non-Sofety Related."
5.
General Maintenance Instruction, 07-5-14-182," Installation and Removo! of the Drywell Head, Non-Sofety Related."
6.
General Maintenance instructions,07-S-14-189,"Installotion and Removal of the Fuel Pool and Canal Gates, Non-Sofety Related."
7.
A maintenance instruction for the installation and removal of the steam dryer has not yet been prepared. When on instruction is prepared, it will include the necessary detail, precautions, etc. to odequately oddress the requirements of NUREG 0612.
8.
As with the steam dryer (oddressed above), no maintenance instruction for the installation and removal of the Reactor Vessel Insulation Assembly hos yet been prepared. The some conditions for procedure development and content opply as for the steam dryer (Note 7).
9.
The Maintenance instruction for Polar Crane Operation in general is opplicable to oil loads. In oddition, it governs the lif ts of all loads listed in this tobic that do not have special lif t procedures designated.
l Rev. I 18 2/10/82
_. _