ML19259D522

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Responds to NRC 780612 Questions Re Controlling Heavy Loads Near Spent Fuel.Forwards Relevant Plant Procedures
ML19259D522
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 08/02/1978
From: Herbein J
METROPOLITAN EDISON CO.
To: Stello V
Office of Nuclear Reactor Regulation
Shared Package
ML19259D523 List:
References
GQL-1292, NUDOCS 7910240784
Download: ML19259D522 (5)


Text

i= gpjy j 7 4Y REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

DISTRIBUTION FOR INCOMING MATERIAL 50-289 REC: STELLO V ORG: HERBEIN J G DOCDATE: O?/02/78 NRC - METROPOL EDISON DATE RCVD: 08/04/78 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 40 RESPONSE TO NRC REQUEST OF 06/12/78. FORWARDING INFO CONCERNING THE CONTROL OF HEAVY LOADS NEAR SPENT FUEL. W/ATT SUPPORTING INFO.

PLANT NAME: THREE MILE ISLAND - UNIT 1 REVIEWER INITIAL: XJM DISTRIBUTOR INITIAL. N

                                  • DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS ******************

GENERAL DISTRIBUTION FOR AFTER ISSUANCE OF OPERATING LICENSE.

(DISTRIEUTION CODE AOO1)

FOR ACTION: E u EF ORB #4 BC**W/7 ENCL INTERNAL: CO FT **W/ ENCL NRC PDR**W/ ENCL I & E**W/2 ENCL OELD**LTR ONLY HANAUER**W/ ENCL CORE PERFORMANCE ER**W/ ENCL AD FOR SYS & PROJ**W/ ENCL ENGINEERING BR**W/ ENCL REACTOR SAFETY BR**W/ ENCL PLANT SYSTEMS BR**W/ ENCL EEB**W/ ENCL EFFLUENT TREAT SYS**W/ ENCL ',

J. MCGOUGH**W/ ENCL .

EXTERNAL: LPDR'S HARRISBURG, PA**W/ ENCL TERA **W/ ENCL NSIC**W/ ENCL ACRS CAT B**W/16 ENCL flk 1459 299 DISTRIBUTION: LTR 40 ENCL 39 CONTRCL NBR: 732iuOO43 SIZE: 1P&SP+S6P

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POST OFFICE BOX 542 READING, PENNSYLVANI A 19603 TELEPHONE 215 - 973-2601 August 2, 1978 GQL 1292 Mr. Victor Stello, Director Division of Operating Reactors U. S. Nuclear Regulatory Cc= mission Washington, D.C. 20555

Dear Sir:

Three Mile Island Nuclear Station, Unit 1 (TMI-1)

Operating License No. DPR-50 Docket No. 50-289 -

This letter and the enclosure is in response to your June 12, 1978 request for information concerning the control of heavy loads near spent fuel.

Much of the information requested was forwarded to you in previous submittals (i.e. FSAR, Cask Drop Evaluation 2-lh-76 GQL 0215, Cask Drop Analysis Additional Information 1-31-78 GQL 0147). These previous submittals sre referenced where applicable in the enclosure.

Sincerely,

/J.G.Herbein

/ / Vice President-Generation JGH:DGM:Jr Enclosure (40 copies) 1459 300 7e2260oy g\ gb m3 4

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  • D'T Y D**]D o o Ju o A._ A 1 h

o Questien #1: Provide a diagram which illustrates the physical relation between the reactor core, the fuel transfer canal, the spent fuel storage pool and the set down, receiving or storage areas for any heavy loads moved on the refueling floor.

Response #1: See attach =ents A & B and 1-31-78 submittal.

Question #2: Provide a list of all objects that are required to be moved over the' reactor core (during refueling), or the spent fuel storage pool. For each object listed, provide its approximate weight and size, a diagram of the movement path utilized (including carrying heigM) and the frequency of movement.

Responce 10: The Ecc.ctor Closure Head passas over the core during its rencval and again when it is reinstalled. Details of these steps are specified in Three Mile Island Nuclear Station, Unit 1 Refueling Procedures 1504-7 and 1506-2, respectively.

The Head veighs 164 tons and is approximately 25 feet tall and 16 feet in diameter. Attachments C and D roughly show its path to and from the Reactor Head Storage Stand.

The Plenum a'so passes over the core twice each refueling, going to and from its storage location in the deep end of the fuel transfer canal (see Attachments E and F). The Indexing Fixture must be installed prior to and removed right after each movement of the Plenum. Details of these steps are specified in Three Mile Island Nuclear Station, Unit 1 Refueling Procedures 150h-8 and 1506-1. The Plenum is 10 feet, 7 3/h inches tall and 13 feet,10 T/8 inches in dia=eter and weighs approxicately h9 tons. The Indexing Fixture is approxi-mately 6 feet tall and 1h feet, 6 inches in diameter. and is moved roughly by the path shown in Attachments G and H. The Plenum is lifted high enough to clear the Indexing Fixture prior to its lateral movement.

All movement of fuel and control rod assemblies around the core and in the spent fuel pool are done using fuel handling bridges. New fuel and control rod assemblies, however, are sometimes moved using the Fuel Handling Building Crane. The new fuel assemblies are moved, as shown in Attachments I and J, to either the new fuel elevator or the dr/' fuel storage pool. The new control rod assemblies are placed in the fuel assemblies at one of these two places. The fuel assemblies are lh feet long and weigh approximately 1,380 lbs. in water.

The control rod assemblies are also lh feet long and veigh abou+.

100 lbs. in water. When moved, the botten of the asse.=blies are kept five to six feet off the floor.

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, m Question #3: What are the dimensions and weights of the spent fuel casks that are or vill be used at your facility?

R2sponse #3: Cask Tree Weight (Tons) Length (In. ) Diameter (In.)

NFS-4 30 202 39 2

- NLI 30 195 36.5 IF 300 75 210 61 5 ,,

IF 400 110 212.25 75 25 NLI 10/2h 110 20h 82 No spent fuel casks have been used. The type of cask for future use has not yet been identified. However, TMI-1 can accoasodate any cask veighing < 110 tons.

Question #4: Identify any heavy load or cask drop analyses performed to date for your facility. Provide a copy cf all such analyses not previously submitted to the NRC staff.

Response #h: There were 2 cask drop analyses perfor=ed.for TMI-1. Section 9 71.1 " General System Function" of the FSAR describes areas capable of withstanding a cask drop. Our letters of February 1k,1976 (GQL 0215) and January 31, 1978 (GQL 0147) further elaborate on various hypothetical cask drop accidents.

Question #5: Identify any heavy loads that are carried over, equipment I required for the safe shutdown of a plant that is operating at the time the load is moved. Identify what equipment could be affected in the event of a heavy load handling accident (piping, cabling, pumps, etc.) and discuss the feasibility of such an accident affecting this equipment. Describe the basis for your conclusions.

Response #5: Analyses of heavy load handling accidents affecting safe shutdown equip =ent (specifically spent fuel shipping casks in the fuel handling building) are described in our letters of 2-lh-76 (GQL 0215) and 1-31-78 (GQL 01k7).

Westion #6: If heavy loads are required to be carried over the spent fuel storage pool or fuel transfer canal at your facility, discuss the feasibility of a handling accident which would result in water leakage severe enough to uncover the spent fuel. Describe the basis for your conclusions.

Eesponse #6: There is a 15 ton limit on loads over the pools enforced by a crane interlock. Also, see response to question #2 above. The potential for water leakage from the spent fuel pools due to a cask handling accident are described in our letters of 2-lh-76 (GO' 0215) and 1-31-78 (GQL 01h7).

.
estion #T
Describe any design features of your facility which affect the potential for a heavy load handling accident involving spent fuel, e.g. , utilization of a single failure-proof crane.

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m Response #7: Design features which affect the potential for a heavy load handling accident (specifically spent fuel casks) are des-cribed in our letters of 2-lh-76 (GQL 0215) and 1-31-78 (GQL 0147).

Question #8: Provide copies of all procedures currently in effect at your facility for the movement of hear / loads over the reactor core during refueling, the spent fuel storage pool, or equip-ment required for the safe shutdown of a plant that is oper- -

ating at the time the move occurs.

Response #8: See Attached procedures 1507-1 and 1507-2.

Question #9: Discuss the degree to which your facility complies with the eight (8) regulatory positions delineated in Regulator / Guide 1.13 (Revision 1, December, 1975) regarding Spent Fuel Storage Facility Design Basis.

Response #9: TMI-1 fulfills the eight (8) regulator / positions delineated in Reg. Guide 1.13 (Revision 1, December, 1975).

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