ML20045B777

Forwards Request for Addl Info Re TS for Spent Fuel Storage Pool Mods for Unit 2

ML20045B777
Person / Time
Site:	Millstone
Issue date:	06/15/1993
From:	Vissing G Office of Nuclear Reactor Regulation
To:	Opeka J CONNECTICUT YANKEE ATOMIC POWER CO., NORTHEAST NUCLEAR ENERGY CO.
References
TAC-M86361, NUDOCS 9306210068
Download: ML20045B777 (4)

Text

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June 15, 1993 Docket No. 50-336 Distribution:

Docket' File NRC & Local PDRs PD I-4 Plant SVarga Mr. John F. Opeka JCalvo Executive Vice President, Nuclear SNorris Connecticut Yankee Atomic Power Company GVissing Northeast Nuclear Energy Company OGC Post Office Box 270 ACRS (10)

Hari. ford, Connecticut 06141-0270 LTDoerflein, RI NWagner

Dear Mr. Opeka:

HAshar GBagchi

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION CONCERNING TECHNICAL SPECIFICATIONS FOR SPENT FUEL STORAGE P0OL MODIFICATIONS -

MILLSTONE 2 (TAC NO. M86361)

In our review of your application for amendment dated May 14, 1993, concerning the technical specifications related to the proposed modification of the Millstone 2 Spent Fuel Storage Pool, we have identified the need for additional information. The enclosure provides details concerning the information that is needed.

Since we are delaying issuance of the Federal t

Reaister notice until we have information such as that which is requested, we request a quick response.

This requirement affects one respondent and, therefore, is not subject to Office of Manapement and Budget review under P.L.96-511.

Sincerely, Original signed by:

Guy S. Vissing, Senior Project Manager Project Directorate I-4 Division of Reactor Projects - I/II-Office of Nuclear Reactor Regulation

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WASHINGTON, D.C. 205554>001 June 15, 1993 Docket No. 50-336 Mr. John F. Opeka Executive Vice President, Nuclear Connecticut Yankee Atomic Power Company Northeast Nuclear Energy Company Post Office Box 270 Hartford, Connecticut 06141-0270

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION CONCERNING TECHNICAL SPECIFICATIONS FOR SPENT FUEL STORAGE P00L MODIFICATIONS -

MILLSTONE 2 (TAC N0. M86361)

In our review of your application for amendment dated May 14, 1993, concernlng the technical specifications related to the proposed modification of the Millstone 2 Spent Fuel Storage Pool, we have identified the need for additional information. The enclosure provides details concerning the information that is needed.

Since we are delaying issuance of the' Federal Reaister notice until we have information such as that which is requested, we request a quick response.

This requirement affects one respondent and, therefore, is not subject to Office of Management and Budget review under P.L.96-511.

Sincerely, Guy Vissing, Sent r Project. Manager-Project Directorate I-4 Division of Reactor Projects - I/II Office of Nuclear Reactor. Regulation

Enclosure:

Request for Additional Infcrmation cc w/ enclosure:

See next page r

Mr. John F. Opeka Millstone Nuclear Power Station Northeast Nuclear Energy Company Unit 2 CC*

Gerald Garfield, Esquire R. M. Kacich, Director.

Day, Berry and Howard Nuclear Licensing Counselors at Law Northeast Utilities Service Company City Place Post Office Box 270 Hartford, Connecticut 06103-3499 Hartford, Connecticut 06141-0270 W. D. Romberg, Vice President J. P. Stetz, Vice President Nuclear Operations Service.s Haddam Neck Plant Northeast Utilities Service Company Connecticut Yankee Atomic Power Company Post Office Box 270 362 Injun Hollow Road Hartford, Connecticut 06141-0270 East Hampton, Connecticut 06424-3099 Kevin McCarthy, Director Regional Administrator Radiation Control Unit Region I Department of Environmental Protection U.S. Nuclear Regulatory Commission State Office Building 475 Allendale Road s

Hartford, Connecticut 06106 King of Prussia, Pennsylvania 19406 Allan Johanson, Assistant Director First Selectmen Office of Policy and Development Town of Waterford Policy Development & Planning Division Hall of Records 80 Washington Street 200 Boston Post Road Hartford, Connecticut 06106 Waterford, Connecticut 06385 S. E. Scace, Vice President P. D. Swetland, Resident Inspector-Millstone Nuclear Power Station Millstone Nuclear Power Station Northeast Nuclear Energy Company c/o U.S. Nuclear Regulatory Commission Post Office Box 128 Post Office Box 513 Waterford, Connecticut 06385 Niantic, Connecticut 06357 J. S. Keenan, Nuclear Unit Director Charles Brinkman, Manager Millstone Unit No. 2 Washington Nuclear Operations Northeast Nuclear Energy Corrpany ABB Combustion Engineering Post Office Box 128 Nuclear Power Waterford, Connecticut 06385 12300 Twinbrook Pkwy, Suite 330 Rockville, Maryland 20852 Nicholas S. Reynolds Winston & Strawn G. H. Bouchard, Director i

1400 L Street, NW Nuclear Quality Services Washington, DC 20005-3502 Northeast Utilities Service Company Post Office Box 270 Hartford, Connecticut 06141-0270 4

Enclosure l

Reauest for Additional Information Millstone Unit 2 Spent Fuel Storace Pool Modifications Docket No. 50-336

References:

1.

Letter from E. Barba (Northeast Utilities - NE) to NRC, " Proposed Revision to Technical Specifications," Dated May 14, 1993.

2.

Material presented to the NR( during the Meeting of May 20, 1993.

1.

The references indicate that under the proposed revision, Region C racks could have various combinations of the fuel assemblies (FA); (1) single FA without poison pin, (2) single FA with poison pin, (3) consolidated FA, and (4) empty cells. The weights and the spacings (gaps) between the FA and the cell would vary in each cell.

It is difficult to envelope the forces and displacements of the FAs and the racks under the postulated seismic loading.

Provide a description of the cases considered (if appropriate, from the previous rerack applications), a summary of the results, and provide justification that the cases considered envelope various combinations.

2.

Differences in the loadings (from FAs) in the racks of Regions A, B, and C will also affect the relative displacements of the racks under the postulated seismic loadings.

Provide information on the consideration of rack to rack, and rack to wall interactions.

Also, provide information on the adequacy of the wall during such interactions.

3.

Under the proposed configuration of the fuel assemblies, the maximum pool temperature has been computed as 150'F under normal conditions, and greater than 212*F under accident conditions.

Provide information on the effects of these sustained temperatures on the integrity of the reinforced concrete pool walls and floor.

4.

For fuel handling accidents, drop of fuel assemblies (single or consolidated) and drop of rodlets need to be considered.

Provide information on the effects of such drop accidents on the rack, and on the pool liner.

5.

Discuss briefly whether any problem exists in cooling the rodlets in the hottest fuel assembly during storage of irradiated fuel in the Millstone 2 spent fuel pool.

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