ML19220C689
| ML19220C689 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/04/1979 |
| From: | Bates A, Etherington H Advisory Committee on Reactor Safeguards |
| To: | Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-SM-0012, ACRS-SM-12, NUDOCS 7905140034 | |
| Download: ML19220C689 (2) | |
Text
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April 4, 1979 H. Etherington A. Bates
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Three I;ile Islcr.d Accident
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Tho follcuing ball-park numbers may be useful to Subcommittee ncmbers as I
bacteround:
l.
Fc.:er Level - 931 of 2772 IU(t) 3 g_
2.
Reactor Coolant V_olume - 11,500 ft 3
3.
Pgattor Yessel Volume - 4058 ft g
6 3
4.
Cgtainment Volume - 1.98 X 10 ft 5.
Total heat Generated from start of co merical operation = 184,000 !!..' days (t) 6.
Fuel Exposure - 90 days cr less at full power
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7.
Fuel BL. ccd - = 194 Kg 8.
EecLv Heat Rate - (fraction of operating power)
=
Tir.e after shutdmen 1 hr 1 dav 1 week 30 days
{
30 days exposure 0.0141 0.0050 0.0019 0.00061 90 days explosure 0.0151 0.0059 0.0027 0.0011 1 year explosure 0.0157 0.0066 0.0033 0.0016 9.
Total Stcble and Long-lived fioble Gas Generation
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3
= 168 ft at STP condition
- 10. Gas Bubble in Core - (at 280 F and 1000 PSIA) - 95% non-condensable U
11.
Free volume of non-cc densable gas in 1000 ft3 k
bubble at 1000 PSIA 3
(2800F) i
_4 6,4 00 f t3(1 atmosphere,70Fl U
9o 3'O
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12.
Following~ bubble removal (most of), containment measured 2.3% H.,
h 1 45,500 ftTJfTn~~te'ifegree of agreement with (~1T))
2
- 13. Assu,e.46,400 fc3 H from hetal-Water Reaction, then approximately
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2 12% of core claddino reacted 7905140034
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nree Mile Island Accident Su:..aary April 4,1979 14.
Renoval of lj2-If0'50 S35 bu_bfie in vessel Solubility of H in H O at the reactor vessel is on the order of 2
2
-4
.82 X 10 lb H /lb H O 2
2 Stripping of hydrogen from primary coolant and dissolving of bubble would require pumping of 2.7 X 100 lb H 0 through the pressurizer.
2 At maximum pressurizer heater capacity (58 gpm spray) this vlould require about 5 days.
Initial bubble decrease would be small due to saturation of71uid, as H concentration in H 0 decreased a 2
p gradient v auld be establisheu allc,ing more rapid diffusion of 11 into the water at the bubble surface.
2 3
Assuming that the 11,500 ft of primary coolant vias also saturated viith Hydrogen al additional 530,000 lb of H 0 would have to be pumped 3
through the pressurizer sprays for strippins, equivalent to 20%
additional time.
99 331