ML19221A344
| ML19221A344 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/13/1979 |
| From: | Thiesing J AFFILIATION NOT ASSIGNED |
| To: | |
| References | |
| NUDOCS 7905210312 | |
| Download: ML19221A344 (5) | |
Text
Memo No. ? V J TASK CLOSE OUT 00CJ4ENT O
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M. Levenson S. Levy E. Zebroski Task No.
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SIMULATION OF FIRE IN CONTAlhWEVT Industry Advisory Group Three Mile Island Unit 2 4/13/79
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James W. Thiesing 159 Zil g
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INTRODUCTION
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In order to define the like1y progression of events in the containment
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building in response to a fire within the building, a probable maximum combustion rate fire has been postulated and the resulting containment response to such a fire has been quantified.
DEFINITION OF SDfU!ATION BASIS FIRE It was assumed that the 450 gallons of lubricating oil containeJ. in the lube oil system for two reactor coolant pumps (one 100p) is sci 11ed uniformly on the floor of the steam generator vault (1000 ft.2) resulting in an oil layer 0.8 inches thick. A burn rate of 8 inches per hour was used, resulting in a 6 minute fire.
A heat rate of 20,000 Btu /lbm was used.
ASSUMED CPERATOR/ SYSTEM RESPONSE It was assumed that all 5 air coolers and both spray trains would be actuated by the operator one minute after ignition in response to the rapidly I
rising (superheat) temperature in the containment.
RESULTS The attached figure describes the pressure and temperature response of the containment building (assumed homogeneous) to the simulation basis fire.
Clearly, the building spray system is effective in suppressing building super-heat and pressure to acceptable values.
Given the convective nature of heat transfer to uninvolved equipment is likely that most containment equipment would surviv? in operable condition.
FIRE SUPPRESSION Given a severe fire which does not communicate with other combustibles, the resulting pressure / temperature response can be controlled at acceptable the five.
levels provided burns itself out without spreading.
Equipment in the srea of 4
the fire would, of course, be disabled.
It is doubtful that currently installed
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ecuipment (primarily building sprays) can extinguish large fires with any efficiency, it can only control the resulting temperature transient.
159 262
r Effective fire suppression capabili.,
can possibly be established by I) installing a high capacity freon or other gaseous suppressant delivery system on one of the cuilding purge penetrations.
Ten volume percent freon could be established in ten minutes with a 20,000 cfm system, capable of pumping against,.
say, 50 psig.
OPERATOR QUES As can be seen from the figure, the tip-off to existance of a fire in containment is a rapidly rising superheat temperature in the building (i.e.
rapid te=perature without a commensurate rapid pressure rise).
Such a transient should, as a matter of procedure, call for immediate operator initiation of building sprays, air coolers, and any installed fire suppression systems.
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159 263
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