ML20037B313
| ML20037B313 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 09/09/1977 |
| From: | Turbak M COMMONWEALTH EDISON CO. |
| To: | Desiree Davis Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8009120712 | |
| Download: ML20037B313 (3) | |
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Cru First Nits.ial Plata. Chicago. Ilknois r=p-'";:
g, },, f Addrus Reply to: Post Office Box 767 U d' d -
(y Chicago, Illinois 60690 September 9, 1977 kD In, Mr. Donald K. Davis, Acting Chief g'
Na Operating Reactors - Bran h 2 4'Y e.
r Division of Operating Reactors q
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Washington, DC 20555 1977
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Subject:
Dresden Station Unit 1 Metal Surveillance Program kj7,. I \\ g' V NRC Docket No. 50-10
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Dear Mr. Davis:
An updated list of all the Dresden Station Unit 1 metal surveillance capsule data was requested by Mr. K. G. Hoge of the NRC Staff in a recent telephone conversation.
The attached list deviates from the previously published data, in that more recent neutron sectional values were used in recalculation of this data.
A linear least square fit of all of the data in Table 1 (attached) gives:
RTNDT = 65.795
- log fluence - 1060.2 (1),
where RTNDT is the adjusted reference temperature based at the 30 ft. lb. level, and the fluence is taken to the base 10 loga-rithm.
A correlation coefficient of 0.9089 was calculated for this data.
A similar' relationship was also calculated, using only the transverse data:
RTNDT = 71.3226
- log fluence - 1156.6 (2),
showing slightly higher correlatior, coefficient of 0.9698.
The heatup and cooldown curves (attached) were recalculated, using Equation (2) with a fluence of 1.4
- 1019 nvt (approximately 2.4
- 106 megawatt days of thermal power), and a factor of 0.787 to account for the fluence reduction from the capsule to the ma::imum fluence at the \\T wall position.
One (1) signed original and 39 copies of this letter are provided for.your use.
Very truly yours,
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80091207-M.
- s. Turbak Nuclear Licensing Administrator A ttachments
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1 1
TABLE 1 30 Ft. Lb. Transition Temperature Data for D esden U-1 (All fluence measurements based on updated cross-sectional values)
Capsule Location Fluence Transition Temnerature (*F)
IL(a)
OL IT OT Near wall 3.4*1017 105 115 Near wall 3.'1*1018 125 135 135 155 Near wall 6.4*1018 180 180 1
Near wall 1.2*10 9 194 212 18 Near core 4.67*10 155 160 170 170 Hear core 1.0*1019 200 215 Near core 3.2*1019 215 215 225-235 Near core 1.13*1020
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280 285
- 2. 0 280 Near core 8.67*1019 190 Near core-4.07*1019 190 Weld HAZ Hear wall 1.0*1019 43 12 Near core 8.67*1019 85 120 Near core 1.533*1020 135 200 a)
L - Longitudinal I - Incide Surface T - Transverse 0 - Outside Surface l
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A - Itydrostatic Pressure Test Curve j
B - Heatup-Cooldown Curve (Core l
Suberitical) l A
1200 - C - Critical Core Operation
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B C
1000 9
'A O
E 600 P,
it 400 000 I
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L i
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0 100 200 300 Cdolant Tegerature (*F)
I Dresden Unit 1 lleatup - Cooldown Curve at 100*P/M for an accusailated Fluence of 1.4*1019ny t'.
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