ML20024B293
| ML20024B293 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/03/1979 |
| From: | Deddens J BABCOCK & WILCOX CO. |
| To: | Embrey N BABCOCK & WILCOX CO. |
| References | |
| TASK-06, TASK-6, TASK-GB GPU-2424, NUDOCS 8307080285 | |
| Download: ML20024B293 (2) | |
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3o D.H.Roy regj l it. 5. EP.%EY - tW;A;ER. :r:0 r.ARr.Eilt, c g*astt:Ess etAr:nst:c To MAY i FIG A;E.ME!.T (2153)
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- m' Date LUMiUtdllAL ttAY 3, 1979 suoj.
CCr.?ETITC A !!;TELLIGENCE I
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ga..................-......-..w The follesin; information was given to me by a reliable source and represents a su = ary of information cevele;ed by. Cocaustion Engineering.
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This informatien was allegedly prepared at the request of CPU to Co l
L Engineering... Lt I
plants.
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Relative to the Thi lacident, the following ite: s are significantt k
The 075C has a very low water inventory to act as a heat sink l
C.E. steam generators have about 23 minutes f
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on loss.of feed.
stearaing capacity follo ing a trip on low steam generator level.
E The ELV plants do not trip on either loss of feed or loss of load s
C.E. plants L
2.
do they have a level trip on the steam generator.
trip on low stean generator level (either) with approxir.ately
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or C.E. plants
.80% of the normal operating inventory still available.
L power. steam dien also trip on loss of load of greater than 50:This trip varies t
system will handle the lesi than 50 power.
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between plants.
s On loss of load StV plants nomally trip on high pressurtzer i
4 Electro-atic relief valve setpoint is less than the 3
.j pressure.
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- reactor trip setpoint.
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The OTSC (Iow profile plant design) creates a large loop ses) 0 on the cold leg to the vessel since the steam generator is 4.
70 feet The S&V core sits r:uzh higher in the
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on the reactor vessel flange.
Therefore, the steam generators reactor vessel than the C.E. core.
do not gravity drain to the reactor vessel and the natu
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plant.
9 Br.V pressurizer sits 1 ewer relative to the reactor vessel than the- ',
Therefore the pressuri:er surge line contains 5
A C.E. pressurizer.
a loop' seal and does not co:aletely drain to the vessel.
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fN1 MAY 3, 1973 - PAGE 2
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The !*.V aressurizer is sealler than the C.E. pressuri:er. The re fo re resulting In a harder plant to control fra a pre.ssure control point of view.
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The BT,W RCS volume is sraller than the C.E. plant for the same range of design power which reduces the pri: ary heat sink and makes the plant rore responsive and harder to ccatrol.
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