ML20151U814

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Forwards Criticality Safety Assessment for Use of Plasma Arc Torch to Cut Upper Core Support Assembly Baffle Plates & Core Support Shield, for Review & Approval
ML20151U814
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 08/11/1988
From: Standerfer F
GENERAL PUBLIC UTILITIES CORP.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20151U819 List:
References
NUDOCS 8808190259
Download: ML20151U814 (1)


Text

.______

O g GPU Nuclear Corporation

,,j ggg7 Post Office Box 480 Route 441 South Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Olrect Olal Number:

(717) 948-8461 August 11, 1988 4410-88-L-0110/0381P US Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

Dear Sirs:

Three Mile Island Nuclear Station, Unit 2 (TMI-2)

Operating License No. DPR-73 Docket No. 50-320 Criticality Safety Assessment for Use of the Plasma Arc Torch to Cut the Upper Core Support Assembly Baffle Plates and the Core Support Shield Attached for NRC review and approval is the Criticality Safety Assessment for Use of the Plasma Arc Torch to Cut the Upper Core Support Assembly Baffle Plates and the Core Support Shield. This safety assessment demonstrates that the maximum allowable drainable volume for the plasma arc torch system can be safely increased from 3.0 gallons to 3.5 gallons. The current limit (i.e. ,

3.0 gallons) was analyzed by GPU Nuclear letter 4410-87-L-0139 dated November 30, 1987, and approved by NRC Letter dated April 1, 1988. When the plasma are torch is positioned to cut at or near the top of the baffle plates, the length of the cooling water supply hose below the Reactor Vessel water level will be shorter than was assumed in the referenced GPU Nuclear letter. Consecuently, the amount of unborated water that can drain into the RV is potentially greater than 3.0 gallons.

Sincerely,

?u / h l l F R. Sta erfer [

cob Director, TMI-2 co o gM RDW/ emf Nf C Attachment (

$x cc: Senior Resident Inspector, TMI - R. J. Conte g g gh Regional Administrator, Region 1 - W. T. Russell Director, Plant Directorate IV - J. F. Stolz Systems Engineer, TMI Site - L. H. Thonus GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation