ML20133Q374

Forwards Safety Evaluation Re Preliminary Defueling Activities.Proposed Preliminary Defueling Activities Approved.Activities May Commence Upon NRC Approval of Applicable Defueling Procedures,Per Tech Spec 6.8.2

ML20133Q374
Person / Time
Site:	Three Mile Island
Issue date:	10/29/1985
From:	Travers W Office of Nuclear Reactor Regulation
To:	Standerfer F GENERAL PUBLIC UTILITIES CORP.
Shared Package
ML20133Q375	List: ML20133Q374 ML20133Q387
References
CON-NRC-TMI-85-082, CON-NRC-TMI-85-82 NUDOCS 8511010523
Download: ML20133Q374 (2)

Text

DISTRIBUTION:

DN 50-320

. NRC PDR Local PDR DCS TMI HQ r/f October 29, 1935 n er NRC/THI 85-082 WDTravers MTMasnik Docket No. 50-320 ph* ""

RCook CCowgill

!ir. F. R. Standerfer LChandler Vice President / Director TMI-2 IE GPU Nuclear Corporation ACRS P.O. Box 480 M-Town Office Middletown, PA 17057 Service List

Subject:

Comencement of Three Mile Island Unit 2 Preliminary Defueling Operations In a letter dated October 24, 1985, General Public Utilities Nuclear (GPUN) requested Nuclear Regulatory Commission (HRC) approval to begin certain preliminary defueling activities prior to receiving final approval for the cemencement of full defueling operations. Subsequent to this written request GPUN further modified the scope of proposed preliminary defueling activities. These modifications were informally transmitted to the NRC onsite staff. As proposed, preliminary defueling activities will be conducted entirely within the reactor vessel and comprise a relatively srall part of the activities proposed by GPUN in the Early Defueling Safety Evaluation Report, currently under review by NRC.

As described in your letter and in subsequent discussions with your staff, the preliminary defueling activities will specifically consist of the following: rearrangement of core debris within the reactor vessel to allow complete installation and rotation of the Canister Positioning System and to provide access for defueling tools; and identification and positioning of core debris samples in the vessel. It is also our understanding that general movement of core debris will include the loading of debris baskets, but that no defueling canisters will be inserted into the reactor vessel and no fuel or core debris will be removed from the reactor vessel.

The use of hydraulically-powered defueling tools has been contingent upon the satisfactory testing of the borated hydraulic fluid to demonstrate its miscibility, compatibility with canister recombiner catalyst and stability as a homogeneous borated fluid. The staff has reviewed your test findings on hydraulic fluid and determined that the proposed hydraulic fluid can be used without undue risk relative to criticality and catalyst degradation.

The operation of the Defueling Water Cleanup System (DWCS) in support of preliminary defueling activities is currently precluded until resolution of 8511010523 851029 PDR ADOCK 05000320 P PDR cwpics >

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!!r. F. R. Stancerfer October 29, 1985 all quality assurance issues concerning the use of the first four filter canisters and subsequent staf t approval is given to the Canister Technical Evaluation Report (TER) and Di!CS TER. Completion of !aC stati revimi of these issues is currently pending our receipt of 6PilN's response to ilRC questions fonarded in my letter of October 17, 1935.

3ased en the ecclosea safety evaluation and the IMC licensing at rive (5)

Fuel Haadling Senior Reactor Operators (FHSRO's), we approve ine proposed preliuinary defueling activities described herein. These activities may comence upon staff approval of the applicable defueling procedures pursuant to Technical Specification G.8.2.

Sincerely, .

omGINA' wittiam D UC#

Willian D. Travers Acting Director T!!I Progrem office Office of huclear Reactor Requlation

Enclosure:

As stated cc: T. F. Demitt R. E. Rogan S. Levin W. H. Linton J. J. isyrne A. W. Hiller Service Distrioution List (see attachea)

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