ML20098B538

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Slide Presentation Entitled, Hydrogen Source Term for BWR Degraded Core Accidents
ML20098B538
Person / Time
Site: River Bend Entergy icon.png
Issue date: 06/29/1983
From: George Thomas
ELECTRIC POWER RESEARCH INSTITUTE
To:
Shared Package
ML20093C471 List:
References
NUDOCS 8409260147
Download: ML20098B538 (42)
v • d • e


Text

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, HYDROGEN SOURCE TERM FOR BWR DEGRADED COPI ACCIDENTS

. i i

. 1 BY GARRY R. THOMAS NUCLEAR SAFETY ANALYSIS CENTER NUCLEAR POWER DIVISION ELECTRIC POWER RESEARCH 15STITUTE PALO ALTO, CALIFORNIA; USA i

PRESENTATION TO U.S. NUCLEAR REGULATORY COMMISSION 3ETHESDA, MARYLAND i

29 Juts 1983 k

8409260147 840910 PDR ADOCK 05000458

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. DEGRADED CORE PHENOMENA a

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e RELATIVELY SLOW INITIAL HEATUP RATES WITH

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. STEAM COOLING e LATER DOMINANCE OF ZIRCALOY OXIDATION EXOTHERMIC ENERGY RELEASE

'e RATE LIMITS FROM LOCAL STEAM OR. STEAM / HYDROGEN CONDITIONS s HIGHDEGREEOFNONC0HEREiiCYI0FCOREDAMAGE e SPATIAL DISTRIBUTION e DAMAGE SEVERITY e RELATIVELY SMALL SYSTEM RESPONSES REQUIRED TO ADEQUATELY SUPPLY SUFFICIENT COOLANT SUPPLIES / HEAT SINKS FOR:

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e PREVENTING CORE DAMAGE DUE TO OVERHEATING e INTERRUPTING CORE HEATUP/ DEGRADATION , PROCESS Q

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SUMMARY

e DETAILED BWR CORE HEATUP CODE DEVELOPED PRODUCTION RATES COMPLETED e SCOPING STUDY OF H2 e. PEAK CORE PRODUCTION RATES (g 1.5 tsM/SEC)

OCCUR FOR SHORT PERIODS (4-1 MIN) AT INITIATION OF ECCS OPEPATION e SUSTAINED CORE PRODUCTION. RATES. (( 10 MINUTES)

FOR ALL CASES RANGE OVER 0.5-0.8 tsM/sec e THESERATESAREATCORE-ACIUALPEAKRATESTO TO DRYWELL/WETWELL WILL BE LOWER (MUTED) AS A RESULT OF PRIMARY SYSTEM THERMAL HYDPAULICS .

t

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TIME VERSUS TOTAL MASS OF HYDROGEN AND SENERATION RATE ' '

TEST 58: SATURATED CORE SPRAY .

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