ML20086R025
| ML20086R025 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/12/1972 |
| From: | Bauer E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Boyd R US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086R026 | List: |
| References | |
| NUDOCS 8402280660 | |
| Download: ML20086R025 (5) | |
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PHILADELPHIA ELECTRIC COMPANY EDWAHO G. D AUER. JR.
23O1 MARKET STREET No or"no at COUNSEL PHILADELPHIA, PA.19101 EUGENE J. HR ADLEY associaTc otNen AL coUN$EL JOHN P. CAREY (215)8414000 DON ALD DLANKEN ALDERT R. DEAL RUDOLPH A. CHILLEMI E. C. KIRK HALL June 12, 1972 T. H. M AHER CORNELL PAUL AUERD ACH ASSISTANT CENCRAL COUNSEL g '%
Mr. Roger S. Boyd t
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Assistant Director for Boiling Water Reactors ff7 Directorate of Licensing g
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United States Atomic Energy Commission sf sg 9
Washington, D. C. 20545 Re:
Peach Bottom Atomic Power Station Units 2 and 3 Dockets Nos. 50-277 and 50-278
Dear Mr. Boyd:
In accordance with your letter of March 13, 1972, infor-mation regarding the effects of all blowdown forces into the torus on the vent pipe anchorages and other structural components is provided in the attachment to this letter.
Y urs very truly, C
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EDNARD G. BAUER* JR*
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3244 COPY SENT REGION N
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v EVALUATION OF Ti!._f; SLONDOMI FORCES _
FROM DISCILiRGE L,I_MES INTO THE__ TORUS Incorporated into the design of the torus is the capability to withstand, without failure, the internal pressure and coincident jet impingement loads resulting from high pres-sure lines in the torus region below the' water line.
Dynamic systen transients are given full consideration.
Additional steps have been taken, in light of recent experience and analyses, to effectively preclude excessive stresses in the discharge lines and damage to the torus coating system.
The analytical investigations considered a full spectrum of loading combinations for the lines discharging into the torus.
Combination Blowdown Forces and Operating Loads As indicated on Figure TBD-1 impingement plates have been added to protect the torus shell in the area of the relief valve discharge lines.
A new restraining systen at the discharge end of the lines (shown on the same figure) was also added to accommodate possible vibrations and differential movemen ts.
The HPCI and RCIC discharge ends have been re-strained as indicated on Figure TBD-2 and forty five degree elbows added to divert the flow away from the torus shell.
A listing of the lines into the torus which are considered is given in Table 1.
For the relief valve discharge configuration and the downcomers, shown on Figure TBD-1, a jet was con-sidered which impinges on the protection plate at an angle.
The design una based on a jet force impinging on the plate equal to the jet pressure times the projected cross sectional area of the line with a total dispersion angle of twenty degrees and no credit taken for the effects of the water for conservatism.
TA3LE 1 SIZE MO.
SYSTEM 12" 11 Relief Valve 24" 1
HPCI 12" 1
HCIC 24" 96 Downcomers 3244 L
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The impingement force is given by:
j i
F
=K K
P A
I d
uu e
e where F
= impingement force y
K
= dynamic load factor d
X
= thrust multiplication factor P
= pressure e
A
= effective area of inningement or net
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cross sectional area of line.
The HPCI and RCIC are restrained for the loads derived using j
the criteria above.
The structural rigidity of the impinge-ment plate results in a uniformly distributed jet load over the surface of th.e plate which is supported on structural members attached to the torus ring girders.
The HPCI and RCIC jet loads are transmitted directly to the ring girders by the structural members added.
The downconers jet load prod':ce local pressures on the torus shell of 5 psi in ad-dition to that pressure associated with the resultant torus pressure from a LOCA which is well under the torus design pressure.
The maximum stress in the impingement plate caused by all the relief valve discharge lines blouing down is 19,000 psi and the allowable stress is 22,000 psi.
The terus ring girders were checked for the given loads and found adequate.
The anchorages for the relief valves at the vent line pene-tration were checked using the methods described in the Uelding Research Bulletin No. 107 which is based on the Maximum Shear Theory for combined stresses.
The maximum stress due to a combination of jet load, temperature and earthquake was found to be 22,000 psi.
The allowable stress is 1.5Sa = 26,250 psi.
Thus it is concluded that the torus and its structural components uill safely withstand without loss of function the combination of jet forces, pressure, temperature and carthqua{.eloading.
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