ML20211L267

Submits RAI & Clarification of Info Provided in Attachment 1 to Ltr Entitled, Reactor Vessel Missile Shield Removal Rept,51-1240140-00, Dtd Dec 1995

ML20211L267
Person / Time
Site:	Three Mile Island
Issue date:	10/03/1997
From:	Buckley B NRC (Affiliation Not Assigned)
To:	Langenbach J GENERAL PUBLIC UTILITIES CORP.
References
TAC-M98471, NUDOCS 9710100149
Download: ML20211L267 (2)

Text

• h.4 October 3, 1997 [-j(,) 1 Mr. James W. Langenbach. Vice President and Director. TMI GPU Nuclear Corporation P.O. Box 480 Middletown PA 17057

SUBJECT:

THREE MILE ISLAND. UNIT 1 NUCLEAR GENERATING STATION (TMI-1) REQUEST FOR ADDITIONAL INFORMATION REGARDING PERMANENT REMOVAL OF REACTOR VESSEL MISSILE SHIELDS (TAC NO. M98471)

Dear Mr. Langenbach:

1 In order to continue our review of the proposed TMI license amendment requested by letter dated-March 31, 1997, the staff needs additional information and clarification of the information provided in Attachment 1 to that letter, entitled. " Reactor Vessel Missile Shield Removal Report.

51-1240140-00." dated December 1995. On page 3-3 of the attachment to your letter, the following statements require clarification: "The CRDM Hold Down Bolts and the RV Head Studs were shown not to be potential missiles. The approach usM was to show that these components do not have sufficient kinetic energy to reach the top of the containment building."

We request that you clarify and provide information with regard to: ]) the scenario.or event that-causes the reactor vessel stud and nut to become a missile: 2) identify if the scenarios of similar potential missiles have been previously evaluated in any design basis document:-and 3) if the stud and attached nut were determined not to be a potential missile based on the approach cf insufficient kinetic energy to reach the top of th. containment building, then discuss the potential imp &ct and safety consequence resulting from the stud and attached nut, after reaching the apex of their trajectory, dropping back down and colliding with other structures, equipment or components important to safety.

Sincerely.

Original signed byl Bart C. Buckley. Senior Project Manager Project Directorate I-3

-Division of Reactor Projects - 1/11 /

Office of Nuclear Reactor Regulation <g Docket No. 50-289 cc: See next page j DISTRIBUTION p PUBLIC PDI-3 Rdg.

F. Grubelich If OGC B. Boger ACRS R. Eaton C. Hehl .

E. Dunnington K. Manoly  !

B. Buckley Docket Files 50-289 DOCUMENT NAME: G:\BUCKLEY\ TAC 98471.TMI T: receive a copy of this document, Indicate in the bos: 'C' = Copy without attachment / enclosure /\*$*hopy with attachment / enclosure

• N* = No copy I 0FFICE Pol 3/PM Q(,@ lC PDil-3/LA lC (A)D:PDj %/PM l l_ l tlAME 88uckley EDunnington d'G) REstok i DATE 10/"\ /97 10/ 3 /97 10/ h /97

. , OFFICIAL RECORD COPY

( P,J ' M M i k l.l!I.lll.l!I. ll l1 II. D3 QEEEER BRW I

wy L Three Hile Island Nuclear Station, Unit No. I cc:

Michael Ross Robert B. Borsum Director, O&M, TMI B&W Nuclear Technologies GPU Nuclear Corporation Suite 525 P.O. Box 480 1700 Rockville Pike Middletown, PA 17057 Rockville, MD 20852 John C. Fornicola William Dornsife, Acting Director Director, Planning and Bureau of Radiation Protection Regulatory Affairs Pennsylvania Department of GPU Nuclear Corporation Environmental Resources 100 Interpace Parkway P.O. Box 2063 Parsippany, NJ 07054 Harrisburg, PA 17120 Jack S. Wetmore Dr. Judith Johnsrud Manager, TMI Regulatory Affairs National Energy Comittee GPU Nuclear Corporation Sierra Club P.O. Box 480 433 Orlando Avenue Middletown, PA 17057 State College, PA 16803 Ernest L. Blake, Jr., Esquire Shaw, Pittman, Potts & Trowbridge 2300 N Street, NW.

Washington, DC 20037 Chairman Board of County Comissioners of Dauphin County Dauphin County Courthouse Harrisburg, PA 17120 Chairman Board of Supervisors of Londonderry Township R.D. #1, Geyers Church Road Middletown, PA 17057 Wayne L. Schmidt '

Senior Resident Inspecto:- (THI-1)

U.S. Nuclear Regulatory Comission P.O. Box 311 Middletown, PA 17057 Regional Administrator, Region I U.S. Nuclear Regulatory Comission 475 Allendale Road King of Prussia, PA 19406 l

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