ML19305C624

Forwards CRBRP-3, Hypothetical Core Disruptive Accident Considerations,Vol 2:Assessment of Thermal Margin Beyond Design Base. Reactor Containment Integrity Maintained for at Least 24-h Following Event

ML19305C624
Person / Time
Site:	Clinch River
Issue date:	03/25/1980
From:	Copeland R ENERGY, DEPT. OF, CLINCH RIVER BREEDER REACTOR PLANT
To:	Vassallo D Office of Nuclear Reactor Regulation
Shared Package
ML19305C625	List: ML19305C624 ML19305C626
References
NUDOCS 8003310161
Download: ML19305C624 (2)

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-) l Departtrent cf Energy Cr.nch Rher Ereeder Reacter Plant Prcject Office RO.EoxU Oak Ridge.Tennessez 37830 Docket No. 50-537 March 25, 1980 Mr. Domenic B. Vassallo Acting Director Division of Project Management Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Comission Washington, DC 20555

Dear Mr. Vassallo:

TOPICAL REPORT ON THERMAL MARGIN BEYOND THE DESIGN BASE (TMBDB)

Enclosed are seventy (70) copies of CRBRP-3, Vol. 2, " Assessment of Thermal Margin Beyond the Design Base," dated March 1980. This document supersedes and substantially updates the analyses on core melt accom-modations provided in our earlier report, " Third Level Thermal Margins" (TLTM), dated April 1976. This volume provides technical assessments _

showing the longer term (greater than 1000 seconds) thermal loads which could result from an HCDA if one assumes loss of integrity of both the reactor and guard vessels. The features provided to mitigate thermal l and radiological consequences resulting from such an event are described and analyzed. Evaluation of the plant capability shows that reactor containment integrity is maintained for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> following the ,

assumed event and the radiological consequences would be comparable to  ;

similar low probability events beyond the design base for light water  !

reactors.

The esponses to the NRC questions related to this topic will be sub-mittad in a future amendment to the Preliminary Safety Analysis Report (PSAR).

Sincerely, f

\ "l 1 flmo'"n*dp. Cod ~a* tid D'SC *'*/ '

PS:80:092 StingAssis6tDirectoi //70

/ for Public Safety

Enclosure:

Topical Report i i

cc: See page 2 an o s aio t6/

s -

Mr. Domenic B. Vassallo 14 arch 25,1980 cc: Service List i Standard Distribution Licensing Distribution 1