ML20137T339

Safety Evaluation Supporting Relocation of Missile Shields & W30X173 Beams from D-ring B to a

ML20137T339
Person / Time
Site:	Three Mile Island
Issue date:	11/20/1985
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20137T321	List: ML20137T316 ML20137T339
References
NUDOCS 8512060438
Download: ML20137T339 (3)

Text

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ENCLOSURE i

SAFETY EVALUATION BY THE OFFICE OF HUCLEAR REACTOR REGULATION FOR RELOCATION OF HISSILE SHIELDS INSIDE THE THI-2 CONTAINMENT t .

A. INTRODUCTION As part of the continuing defueling and recovery effort at T!!I-2, General Public Utilities Nuclear Corporation (GPUNC) needs to perform ex-vessel fuel characterization in the B "D-ring." To accomplish this activity, two missile shields currently stored on top of the B "D-ring" must be relocated to the A "D-ring." A portion of the load path involved in this lift falls outside the bounds of previously analyzed and NRC approved SER's (references 1, 2, and 3). On October 17, 1985, GPUNC submitted an SER for this activity.

l B. DISCUSSION Tha load paths which fall outside the previously approved SER involves two essentially mirror image lifts. Each lift consists of an 1

approxt;.utely 2 ft. vertical lift of a 3,900 lb. W30X173 steel beam, followed by a 2 ft. horizontal movement above the 367 ft. elevation of the A "D-ring." Each beam is then lowered back down the 2 f t. to rest on support beams. Only the northern ends (approximately 5 ft.) of the steel beams will be outside the previously analyzed area during the lift. The missile shields will then be placed on the centers of the beams using previously approved load paths.

GPONC's load handling program incorporates phase I of Generic Letter 81-07(i.e.,section5.1.1of!!UREG-0612). Phase I included the following activities:

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1. Definition of safe load paths

, 2. Development of load handling procedures

3. Periodic inspection and testing of cranes

4. Qualifications, training and specified conduct of operators i S. Special lifting devices should satisfy the guidelines of ANSI N14.6  ;

- 6. Lifting dedces that are not specially designed should be installed 4 and used in accordance with the guidelines of ANSI B30.9 l 7. Design of cranes to ANSI B30.2 or CMAA 1 Implementation of these activitics assures that the potential for a load i drop is extremely small. Since the lift occurs directly over the support beams, if either lifted beam were to drop they would land on the support beams. GPUNC has taken an additional safety measure using an additional.

sling and shackle attached to the W30X173 beams on one end and the support beran on the other. This would serve to catch the load if it were l dropped. The sling and shackle are certified to ANSI B30.9 and have a safety factor greater than 5 to the ultimate tensile strength.  !

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,,. C. CONCLUSIGH GPUNC has implemented a load handling program which assures that the potential for a load drop is extremely small. Additionally, they have provided a means to catch a dropped load while it is outside the previously analyzed load path area. Based on the above and ther licensee's demonstrated operational history on heavy load handling within the reactor building, the staff has determined the relocation of the W30X173 beams and missile shields can be implemented without significant risk to the health and safety of the public.

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1. s' Gr. Thomas Mur14y Willis Bisby. Site Manager Regional Administrator. Region ! U.S. Department of inerg~,

U.S. Nuclear Regula tory Cope 9ission P.O. Son 88 631 Park Avenue Middletown. PA 17057 0311 King of Prussia. PA 19406 David J. McGof f Jahr. F. Wolfe. Esq., Chairman. Olvision of Three Mile Island Progros Administrative Judge af-23 3409 Shepherd St.

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Front & Market Streets Pennsylvania Pubilt Utilities Com.

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6th a walnut Streets s Philadelphia, PA 19106 Mr. to.ie nintner (secutive vice President Thomas M. Gerusky. Director General Subite Uttlities nuclear Corp.

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