ML19212A242
| ML19212A242 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/13/1979 |
| From: | Thiesing J Metropolitan Edison Co |
| To: | |
| References | |
| NUDOCS 7909060361 | |
| Download: ML19212A242 (5) | |
Text
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SIMt!'_ATION GF FIRE IN CONTAINME.'.T i
i Industry Advisory Group Three Mile Island Unit 2 4/13/79
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INTRODUCTION In order to define the likely progression of events in the containment building in response to a fire within the building, a probable maximum combustion rate fire has been pastulated and the resulting containault response to such i
a fire has been quantified.
DEFINITION OF SIMUL \\ TION BASIS FIRE It was assumed that the 430 gallons of lubricating oit ;ontained. in the t
l lube oil system for two reactor coolant pumps (one loop) is spilled uniformly on the floor of the steam generator vault (1000 f t.-)
resulting in an oil layer 0.3 inches thick. A burn rate of S inches per hour was u.p d, resulting in a 6 minute fire. A heat rate of 20,000 Bru/lba was und.
iSMEI) OP MAIOR/SYSfEM RESPO'.SE It.. u, assuned that a!! 3 air coolers and both spray t r.. o -
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l actuated by the operator one minute after ignition in respen to the rapidly t
fl rising (soperheat) temperature in the containment.
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RESULTS h b T.
The attached figure describes the pressure and temperature response of C
-I the containment building (assumed homogeneous) to the simulation basis fire. [d " p }
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y Clearly. the building spray system is effecti'.e in suppressing buildin.; super-heat and pressure to acceptable values.
Given the c')nvect D n a ure o r C -Q
,i u-t r..n s fer to uninvolved equiprent it is likely that most conta' ent equipment wauld survive in operable condition.
FIRE SUPPRiiSSION Given a severe fire which does not communicate with other combuatibles, the resulting pressure / temperature response can be controlled e acceptable tlte NVE.
levels provided burns itself cut without spreading.
Equirnent in the.rea o!
4 the fire would, of course, be disabled.
It is doubt ful th it currently installed equipment (primarily building sprays) can extinguish large fires with any efficiency, it can only control the resulting temperature transient.
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l Effective fire suppression capability can possibly be e >tablished by 1
installing a high capacity freon or other gasceus suppres; ant delivery system cn one of the building purge penetrations. Ten volu:no peccent frean could be established in ten minutes with a 20,000 cfm system, capable of pumping against, say, 50 psig.
OPER.\\ TOR CUES As can be seen from the figure, the tip-off to existance of a fire in I
containment is a rapidly rising superheat temperature in the building (i.e.
rapid temperature without a commensurate rapid pressure rise). Such a transient should, as a r.atter of procedure, call for immediate operator initiation of bu ;l J ir ; sprays, air coolers, and any installed fi re s u pp re s.: i o r s ys t.:a s
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