ML20134A834
| ML20134A834 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/05/1985 |
| From: | Standerfer F GENERAL PUBLIC UTILITIES CORP. |
| To: | Tavers W, Travers W Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-36, REF-GTECI-SF, RTR-NUREG-0612, RTR-NUREG-612, TASK-A-36, TASK-OR 0350A, 350A, 4410-85-L-0222, 4410-85-L-222, NUDOCS 8511110043 | |
| Download: ML20134A834 (4) | |
Text
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.x GPU Nuclear Corporation Nuclear
- ,,ome er8o s
Middletown, Pennsylvania 17057 0191 717 944 7S21 TELEX 84 2386 Writer's Direct Dial Number:
(717) 948-8461 4410-85-L-0222 Document 10 0350A November 5, 1985 TMI Program Office Attn: Dr. W. D. Travers d
- 4 Acting Director 6
US Nuclear Regulatory Commission p,
- .3 c/o Three Mile Island Nuclear Station cp Middletown, PA 17057
-j4 ut as
Dear Dr. Travers:
3 Mr Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. DPR-73 Q
Docket No. 50-320 Heavy Load Handling Safety Evaluation Report Attacned is stoplemental information relevant to the Heavy Load Handling Safety Evaluation Report (SER). The attacrrnent provides additional information on the Canister Handling Bridge (CHB) Shield Collar design and testing. This informaticn is provided based on the discussions with members of the TMI Program Office on Octooer 29, 1985. This information supports the GPU Nuclear contention that the shield collars on the Reactor Building and Fuel Handling Building CHB's are integral components of the CHd's, which are not heavy loads as defined by NUREG 0612,
" Control of Heavy Loads at Nuclear Power Plants". Inerefore, the snield collars should not be considered as heavy loads susceptible to load drops witnin tne context of NUREG 0612.
Sincerely, kdIIj 851105 k
P 05000 0
- f. R.
tanderfe p
Vice President / Director, TMI-2 FRS/RBS/eml Attachment d
t
.I GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
s ATTACHMENT
'(4410-85-L.-0222)
COLLAR DRIVE SYSTEM DESIGN AND TEST ItFORMATION A.
'Wnat are the factors of safety used in the collar drive system? What loads were used in the design?
l.
' Factors of safety of 3 and 5 were used for yield and ultimate respectively.
2.
The full collar weight (9325 pounds Reactor Building (RS), 6275 pounds - Fuel Handling building (FHB)) was used as the design load for each independent collar drive.
3.
Dynamic effects of raising or stopping the collar, or the load transfer, if one drive fails, were not an original design basis.
However, design' calculations have been reviewed and confirm that the factors of safety of 3 and 5 are maintained for each independent collar drive even if a 15% dynamic load factor is considered. The evaluated dynamic factor due to load transfer in the event of drive system failure is less than 15%. The vertical motion load factor based on maximum collar speed is calculated to be 1 1/2% based on the CMAA-70 method for determining load factors for hoists.
B.
What codes were used for basis in the design of the collar drive system?
ANSI B30.2 - 1983 was applied to the design of the structural members of the collar drive system. Additionally, ANSI N14.6 - Section 3.2.1 was applied to incorporate factors of safety of 3 and 5 for yield and ultimate respectively into the design.
C.
What components of the collar drive system were proof-tested and to what loads?
Figure 1 snows a senematic of the key components.
Jackscrew Actuat.or - Tested to 200% collar weignt - static (19,000 lbs - RB,13,000 lbs - FH3)
S@ port Bar and Pins - Tested to 200% collar weight - static (19,000 lbs - RB, 13,000 10s - FHB)
Shield Collar Sw port Tube
_ Tested to 100% collar weight - static (9325 lbs - RB, 6275 los - FHB)
Jackscrew Support (Mounting) Pad on Canister Transfer Shield -
Tested to 100% collar weignt - static
m ATTACHMENT (4410-85-L-0222)
Jackscrew actuators, stoport bars, and pins were proof-tested in a test fixture using a hydraulic cylinder to apply the test load.
Shield collar support tubes and the jackscrew support (mounting) pad on the canister transfer shield were proof-tested after assembly by disconnecting one of the support bars and allowing the full collar weight to be supported on one collar drive.
(4410-85-L-0222)
FIGURE 1 VACKSCREW ACTUATOR
'1 ^p t/ACKSCR[W SUPPORT (MOUNT /NG PAD)
[
SUPPORT EAR { PINS N/[LD COLLAR SUPPORT y
y TUBE
/
CAN/ STER TRANSFER SH/ ELD Y
& SH/ ELD COLLAR 9