ML20151T799
| ML20151T799 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/11/1988 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Standerfer F GENERAL PUBLIC UTILITIES CORP. |
| References | |
| NUDOCS 8808170317 | |
| Download: ML20151T799 (4) | |
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AUG 1 I 1993
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Docket No.
50-320 DISTRIBUTION N~
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Mr. F. R. Standerfer
'NRC 8 Local PDRs OGC Vice President / Director, THI-2 Gray File E. Jordan GPU Nuclear Corporation S.Varga B. Grimes P.O. Box 480 B.Boger ACRS(10)
Middletown, PA 17057 S.Norris I'
Dear Mr. Standerfer:
SUPJECT:
CORIUM JET ASSESSMENT FOR EVALUATION OF SER ON LOWER CORE SUPPORT ASSEMBLY AND LOWER HEAD DEFUELING
Reference:
Letter with attached safety assessrent. 4410-88-L-0006/0253P from F.R. Standerfer to NRC dated June 6,1988 re "Safety Evaluation Report for ccepletion of Lower Core Support Assembly and Lower Head Defueling" The above reference provided infortnation in support of our safety evaluations
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for defueling the lower core support asseeibly and defue ing the lower head.
In order to complete our review of this proposed activity we require additional analysis.
Your June 6,1988 submittal included an evaluation of the lower head themal response as a result of contact with a jet of molten raterials falling into the lower head during the TMI-2 accident.
The conclusions in the subeittal 1
are based uoon the INEL report EGG-TMI-7811. "Thermal Interaction of Core Melt Cebris With The TMI-2 Baffle, Core-Fomer, And Lower Head Structures." On pages 60-63 of that report, an evaluation was presented wherein it was assumed j
that heat transfer between the corius, jet and the lower head was controlled by a convection process. Mcwever, the heatup of the lower head assured a i
conductive process with transient terperatures being obtained using the Biot nurber. Such an approxiration ray be appropriate if the corium jet occurred in the center of the reactor vessel since any relted lower head material and i
the corium jet would accurulate in this region of the vessel. Since the TMI-2 l
corium jet occurred in the outer ring of the core, where there is significant curvature of the lower head, relted lower head raterial would be expected to be carried with the jet and settle in the bottom of the vessel. Thus, lower head raterial would be continuously exposed to the hot corium jet and abalation of the lower head would be controlled by a convective heat transfer process rather then the renductive process assumed in the analysis. This I
would result in increased abalation of lower head.
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2-Provide a revised analysis of the interaction t'etween the coriurn jet and the lower head which accounts for this effect.
If a decreased lower head thickness results, review its effect on other portions of your safety evaluation report and revise the report as appropriate.
Sincerely,
'MlJICAL Slo.TED 3)
JuWy,g;g.
John F. Stolz, Director Project Directorate I-4 Divisien of Reactor Projects I/II cc: See next page LA:k!![
PM I4 PD:
SNorris FF.asnik JSto N ce/tt/88 08p/88 08//488 1
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Mr. F. R. Standerfer Three Mile Island Nuclear Station GPU Nuclear Corporation Unit No. 2 cc:
Frank Lynch, Editorial Regional Administrator Region !
The Patriot U.S. Nuclear kegulatory Comission 812 Market Street 475 Allendale Road Harrisburg, PA 17105 King of Prussia, PA 19406 Dr. Judith H. Johrsrud Robert B. Borsum Environmental Coalition on Nuclear Power Babcock & Wilcox 433 Orlando Avenue Nuclear Power Division State College, PA 16801 Suite 525 1700 Rockville Pike Rockville, MD 20852 Ernest L. Blake, Jr., Esquire Mat-vin I. Lewis Shaw, Pittran, Potts, and Trowbridge 7801 Rocsevelt Blvd. f62 2300 N Street, N.W.
Philadelphia, PA 19152 Washington, DC 20037 Secretary Jare Lee U.S. Nuclear Regulatory Consnission 123 Yalley Road Washington, DC 20555 Etters, PA 17319 Sally S. Klein, Chairperson Walter W. Cohen, Consumer Dauphin County Board of Comissioners Advocate Dauphin County Courthouse Department of Justice i
Front and Market Streets Strawberry Square,14th Floor Harrisburg, PA 17101 Harrisburg, PA 17127 Thomas M. Gerusky, Director Mr. Edwin Kinter t
Bureau of Radiation Protection Executive Vice President Department of Environrental Resources GPU Nuclear Corporation P. O. Box 2063 100 Interpace Parkway Harrisburg, PA 17120 Parsippany, NJ 07054 Ad Crable U.S. Environmental Prot. Agency Lancaster New Era kegion !!! Office 8 West King Street Atta:
Els Coordinator lancaster, PA 17601 CurtisBuilding(SixthFloor) 6th and Walnut Streets Philadelphia, PA 19106 U.S. Department of Energy P. 0. Box 88 Middletown, PA 17057 David J. McGoff Office cf LWR Safety and Technology NC-23 U.S. Deporteent of Energy Washington, DC 20545
2 Mr. F. R. Standerfer Three Mile Island Nuclear Station GPU Nuclear Corporation Unit No. 2 cc:
T. F. Demmitt R. E. Rogan GPU Nuclear Corporation GPU Nuclear Corporation W. E. Potts S. Levin GPU Nuclear Corporation GPU Nuclear Corporation J. J. Byne A. W. Miller GPU Nuclear Corporation GPU Nuclear Corporation P
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