ML20132G491

Forwards Request for Addl Info to Complete Review of 850520 SER Re Early Defueling of Plant Reactor Vessel,Including Description of Procedural & Physical Controls Preventing Inadvertent Lifting of Debris During Defueling

ML20132G491
Person / Time
Site:	Three Mile Island
Issue date:	07/29/1985
From:	Snyder B Office of Nuclear Reactor Regulation
To:	Standerfer F GENERAL PUBLIC UTILITIES CORP.
References
NUDOCS 8508050045
Download: ML20132G491 (4)

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I. 2 Docket-No? 50-320 w

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July 29, 1985 NRC PDR Local PDR DCS I' Docket No. 50-320 BJSnyder WDTravers MTMasnik RAWeller JRHall

lir." F. R. Standerfer PGrant, Site i

Vice President / Director RCook, Site Three tille Island Unit 2 CCowgill, site GPU Nuclear Corporation LChandler, ELD P.O. Box 480 IE (3)

Middletown, PA 17057 ACRS (16)

M-town Office

Subject:

Safety Evaluation Report for Early Defueling By letter dated llay 20, 1985, you submitted the Safety Evaluation Report (SER) for Early Defueling of the Tril-2 Reactor Vessel. Based on our initial review of the SER and the information that was discussed between l

l-i' GPU and the Ti1I Program Office staff on July 25, 1985, we have determined that we need additional information to complete our review. We request your response to the enclosed questions.

! Sincerely, l

/s/ R. A. Weller for Bernard J. Snyder, Program Director Three flile Island Program Office Office of Nuclear Re' actor Regulation

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Enclosure:

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• U.S. GPO M83 00-2U Nac ro:M aia noisoi wacu o24 OFFICIAL RECORD COPY

,. TMI-2 SERVICE LIST Dr. Thomas Murley WHHs'8f aby. Site Manager Regional Administrator Region I U.S. Department of Energy

. U.S. Nuclear Regulatory Commission P.O. Bos 88 631 Park Avenue Mladletown. PA 17057-0311 King of Prussia. PA 19406 .

John F. Wolfe. Esq. Chairman. Division of Three Mlle Island Programs Administrative Judge NE 23 3409 shepherd St. ,,

U.S. Department of Energy Chevy Chase. MD. 20015 Washington. D.C. 20545 *

• Dr. Oscar H. Parh William Lochstet .

Administrative Judge 104 Davey Laboratory Atomic Safety and Licensing Pennsylventa State University Board Panet University Park. PA 16802

• U.S. Nuclear Regulatory Commission Washington. D.C. 20555 Randy Myers. Editorial The Patriot Dr. Frederick H. $ hon $12 Market St.

Administrative Judge Harrisburg. PA 17105 Ateetc Safety and Licensing Board Panet Robert B. Borsum U.S. hciear Regulatory Comission Babcock & Wilcon Washington. D.C. 20555 Nuclear Power Ge..eration Division Suite 220 .

Karin W. Carter 7910 Woodmount Ave. -

Assistant Attorney General Bethesda, MD. 20814 505 Executive House P.O. Box 2357 hichael Churchh111. Esq.

Harrisburg. PA 17120 PILCOP Dr. Judith H. Johnsrud 1315 Walnut St.. Suite 1632 Philadelphia. PA 19107 Environmental Coalition on Nuclear Power Linda W. Little 433 Orlanco Ave. 5000 Hermitage DR.

$ tate College. PA 16801 Raleigh.NC 27612 George F. Trowb-idge. Esq. Marvin I. Lewis Shaw. Pittman. Potts and 6504 Bradford Terrace Trowbridge Philadelphia, PA 1914g 1800 M. St.. NW.

Washington, D.c. 20036 Jane Lee .

183 Valley Rd.

Atomic Safety and Licensing Board Panel Etters.PA 17319 U.S. Nuclear Regulatory Comission Washington. D.C. 20555 J.B. Liberman. Esquire Atomic Safety and Licensing Appeal Panel Berlack !sraels. Liberman 26 droachday U.S. Nuclear Regulatory Comunistica Washington, D.C. 20555 New York. NY 10004 Walter W. Cohen, Consumer Advocate Secretary Department of Justice U.S. Nuclear Regulatory Comission Strawberry Square.14th Floor ATTN: Chief. Docketing & ServfCe tranch Harrisburg. PA 17127 Washington. D.C. 20555 Mr. Larry Hochendoner Edward O. Swartz Dauphin County Comissioner . Board of Supervisors P.O. Box 1295 Lordionderry Tot.nship Harrisburg, PA 1710E-1295 RFD #1 Geyers Church Rd.

Middletown. PA 17057 John E. Minnich. Chairperson.

Dauphin County Board of Cosuiissioners , Robert L. Knupp. Esquire Dauphin County Courthause Assistant Solicitor Knupp and Andrews Front and Marset Streets P.O. Son P Harrisburg. PA 17101 407 N. Front St.

Dauphin County Office of Emergency Harrisburg, PA 17108 Preparedness Court House. Room 7 John Levin. E- :utre -

Front 8 Market Streets Pennsylvania Public Utilities Commi.

I Harrisburg, PA 17101 P.O. Box 3265 l Harrisburg, PA 17120

' U.S. Environmental Protection Agency Region III Office

' ATTN; El$ Coordinator Curtis Building (Stath Floor)

, 6th & Walnut Streets i Philadelphia, PA 19106 Mr. Edwin Kintner' l

Emecutivs Vice President Thomas M. Gerusky. Director General Public Utfitties Nuclear Corp.

Bureau of Radiation Protection 100 Interpace Parkway Department of invironmental Resources parsippany. NJ 07054 P.O. Box 2063 Marrisburg. PA 17120 Den Kennedy As trable Office of Environmental Plasining Department of Envirorumental Resources s't$n treet P.O. Box 2063 Lancaster. PA 17602 Harrisburg, PA 17120

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r ENCLOSURE ,

1. Submit Revision 2 to the Boron Dilution Hazards Analysis and the ~~

Safety Evaluation Report for Heavy Load Handling.

2. Describe' the procedural and physical controls provided to prevent the inadvertent lifting of debris out of water during defueling activities. Discuss the feasibility of providing mechanical means to restrtet the lifting of long-handled tools. What is the highest level that debris could reach if lifted with any combination of rigging bar and long-handled tool?

3. Discuss tne precautions that will be taken during early defueling to prevent damage to any incore instrumentation strings.

4. Describe the equipment used and the methods for weighing the three types of canisters during defueling operations and following dewater-ing in the fuel handling building.

5. Describe RCS sampling capability, frequency, and sampling locations during early defueling.

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6. What conditions could require flooding of the fuel transfer canal (FTC)? To what level would the FTC be reflooded to recover from an abnormal event? Is all water sensitive equipme'nt above the maximum reflood water level?

7. Describe the design and operation of the canister retention mechanisms on the bottom of the canister transfer shield. What controls will be implemented to restrict horizontal movement of canisters? Provide drawings of the canister handling bridges, canister transfer shields and related components.

8. Identify all materials with the potential to affect RCS reactivity during defueling. The administrative limit on boron concentration (4950 ppm) is based on maintaining a level that will allow detection and correction of a boron dilution event prior to reaching the Technical Specification limit of 4350 ppm. Since the introduction of materials that may increase reactivity would reduce this margin of safety between the administrative and T. S. values, what is your justification for using the current administrative limit in the criticality analysis addressing the introduction of these materials into the RCS? Discuss means to prevent the inadvertent intro-duction of these materials into the RCS and specify limits on the quantities that could be introduced. _.

9. Describe the number, type, and location of radiation monitors to be used during early defueling.

10. Provide revised occupational exposure estimates for early defueling when available.

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11. Describe all planned RCS processing activities prior to defueling.

Will RCS concentrations of Cs and Sb be reduced to the levels -

referenced in the SER as a prerequisite for the commencement of defueling?

12. In the event of a canister drop over the dry canal, what are the worst case dose consequences to workers from both direct exposure and airborne contamination?

13. Provide your evaluation showing that the potential accident consequences and occupational exposures that may result from early defueling activities are bounded by the events analyzed in the .PEIS.

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