ML19329G033

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Viewgraphs Presented to ACRS Subcommittee on TMI-2 on 791003
ML19329G033
Person / Time
Issue date: 10/03/1979
From:
NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
To:
Shared Package
ML19329G028 List:
References
SECY-80-107B, NUDOCS 8007110490
Download: ML19329G033 (29)
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~ PERSPECTIVES ON RSS-BUR DESIGN .a (UWit 4. MARK 1 CollTAINMENT.. INERT 5d) ~ P0TENTIAL CONCEPTUAL VALUE ~ ConTAINHENT OV' !:PRCSSURE POTENTIAL RISK lCONTROL FAlluhE IMPACT VENT ; -SCENAilIOS ACCIDENT PROCESS PRE,0!CTIONS* OF SCENARIO INERTING l FILTEl-I l,r. w - Tre.nsient followed by CollT. FAILS MELT. STARTS ' MELT Et Large. Negl'igible Saalk (Daminant) to failu. c to shutdown * ~ (s144 MIN.)1 s77 MIN. s100 MIN. Ait!S (TC) Sequence .Maderd m Tranciant followed by CONT. FAILS T MEl.T STARTS J MELT ENDS Large Negligible Moderai -sailu.e of shutdomi s3260 HIN. $3390 Mitf. (Dominant). heat reir. oval system s2820 MIN. )M i to Sequence. Large (11!j i l Transiont followad by ,/ START MELT h"_,/Eil0 NELT CONT. FAILS) Medius' Small Modera-failura to provide --9 i to "i to ( +160 Mill. ,/ \\, 200 HIN. S232 MIN.j Small Large' s makeup water (TQUV) Small LOCA followed Medium' l10 MELT '\\ CONT. FAI Small Small g. START MEL 3, / 2 by fai sure to provid.: to to s57 Mill * ) < '. 5 2 \\,,,s10% MIN.., . ' _ MIN.j Small F.s.k ra mal:eup water (S E,) g, l i dy HARQl/ CORRAL-DCL Accident Process Modeling l

l .g. -..... - y PERSPECTIVES ON RSS-DilR DESIGN (UWR 4, MARX 1 C0tiTAINHENT.. INERTE0)' POTENTIAL CONCEPTUAL VALUE ~ C0i:TAIMMENT OV:?l:PaE550RE POTENTIAL-RISK l CONTRO 1:AILURE IMPACT VENT S CrN ARIOS ACCIDENT PROCESS PREDICTIDHS* OF SCENARIO INERTING FILTEl. l ~ ~ ~ ( x_._, :. - MELTENDS)1 Tr?.nsient fe,llowed by C0llT. FAILS MELT. STARTS Large. Negligible Small c failu. c to shutdown, (Daminant) to s77 gig, s100 MIN. 5144 MIN.j Sequence Moderat Nil!S (TC) Transiunt followed by CONT. FAILS HELTSTARi HELT ENDS La rge Negligible Moderai railu.e of shutoowii ~ ~ ~. s3390 MIN'.)1 (Dominant). to s2820 MItl. $3260 llIN. hcoc removal system Sequence. Large ] (11!j i y 1 CONT. FAILS). [ TART MELT h .I Transient followed by Medium Small Hodera S Ett0 MELT T j railucc to provide 9 to to i makeup water (TQUV) ( 5160 Mill. / s200. Hili. / $232 MIN.) Small Larce ~ Small LOCA fol10wed / lib MELT T CONT, FAILS Medium Small l Small \\_~,\\,_s10%nIN. hy fat iure to provida START MEL I )~ < 3 MIN. to I to' s57 Mill. makeup water (S E) y __ _ __ _ , ~ _ Smal) wan g f d{Y i t HARGl/ CORRAL: DCL Accident Process Modeling I 0e

I ~ .'uliz....' :JJ2.30B l.. iNM;iiE COh!CEPTS MAY SIGN l.9CANTL'l FT.f.;UCE 'J'.SKS FilC. A.!] i4UCLEA?i ACCIDENYS 30 3 _ i,......i ........i ........i rrrami.....g ~ LEGEND: X 10'4 BASELINE CASE ^ i E (WAS,H 1400 W!O CHECK VALVE) m 5 FibTERED ATdOSPHERIC VENTING us COMPARTMENT VENTING 6 DEEP UNDERGROUND SITING $ 10 3 5 i-. O STRONGER CONTAINMENT " " * " ~ ~"* i INCREASED CONTAINMENT VOLUME y L 10 6 THINNED BASE MAT, tc ia y DOUBLE CONTAINMENT ,'Jj,: T;, . W'z,b EVACUATED CONTAINMENT: C ,, 5. ~.'..,j':.f?j.,.y,3*g..,, w SHALLOW UNDERGROUND SITING ^ J 10'7 g g g ~ x

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~ .c a- ,f,'y. s;. FO!! THE' ALTE flN ATIVE CONCEl'IS M AY' T g ,m NOTE: MAGNITUDES OF RISK REQUCTIONyllOWN N,' q -2 N g 4' NOT BE FULLY REALIZEG IN AN ACTUAL 10 0 r* I; N ,4.' DESIGN; CTHER F ACTORS'M AY T Ll10 '4 0 3 CONTROL RISK REDUCTION MAGN 1fuOt:. N \\ ..V m sa 0 N.iI.isd_ J_1 mu.! 10 - J 1. mud._. u n iiil i > Ar 0 I 2 3 4 , 10'd ~ 10 10 10 10 10 t E AllLY F ATALITIES, X I o

l' . * ;.?.,.,. n e. ' ( > -ls' L SOME CONCLUDING OBSERVATIONS ' !. 'l,' g (,,.,j .) 1 I ~ .} I ~ o lNERTING APPEARS T0 llAVE SMALL VALUE It! REDUCING OVERALL ACCIDENT RISKS. IR SOME CASES, REDUCING ACCIDERT SEQUENCE .i,,'j ~ i PROBABILITY APPEARS T0 llAVE EQUAL OR GREATER VALUE. - i.' i ) ~ j i';.; ] LA'GER, HIGH DESIGil PRESSURE C0itTAlHMENTS ARE LESS .'. } ? ; R o SENSITIVE TO THE EFFECTS OF llYDR0 GEN. 'i e oH2 CONTROL MEASURES THAT MAY BE AD0PTED PURSUANT TO TMI.ll2 i -;,j - SHOULD HAVE BENEFIT OF OVERALL RISK-BASED INSIGilTS AND ]l.,"

CONTEXT,

$y'. f l + o WASH-ll400 EMPHASIZED CORE MELTDOWN ACCIDENTSy THE RISK ... i. i REDUCTION BENEFITS OF CURRENT LICEtlSING 11 2 CONTROL MEASURES..., ' M.,. ".' .. a. s FOR SUCH ACCIDENTS APPEAR SMALL. + : '; e... y :. RESEARCH ON IMPROVED LWR SAFETY CONCEPTS, E.G.,' CONTROLLED. ' (. ;'."! ; o FILTERED VENTING Sil00LD CONTINUE WITH PRIORITY SINCE SUCH CONCEPIS APPEAR TO HAVE RISK REDUCTION BENEFIT AND LO'(l-COST IMPACTS, e 1 0}}

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