ML17173A899
| ML17173A899 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 04/23/1979 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 7906070351 | |
| Download: ML17173A899 (4) | |
Text
Mr. Cordell Reed Assi~tant Vice President Commonwealth Edison Company.
- Post Office Box 767
. Chicago; Illinois 60690
Dear *Mr. Reed:
u APR.23 1979.
We are reviewing the.Spent Fuel-Pool Modification proposed for Oresden.
Unit Nos. 2 and 3 by your letter dated May 1l, 1978.
TC) continue our.
review, the additionat infonnatfon identified *in Enclosure 1.is required. *
- Please prov.ide the requested infonnation within.30 days of your.
- receipt of this letter.
An advance copy of these questions was provided to your ~staff on January 3p, 1979.
Enclosure:
.Request for'~ditional Information ~
cc w/enclosure:
.See next page Sincerely,
. Qriginal Sign~d by:.
Dennis L. ZiemaRn Dennis L. Zieman*n, Chief Operating Reactors Branch #2
. Division df Operating Reactors DISTRIBUTION:
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Mr. Cordell Reed cc Isham, Lincoln & Beale Counselors at Law One First National Plaza, 42nd Floor Chicago, Illinois 60603 Mr. B. B. Stephenson Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 Anthony z. Reisman Natural Resources Defense Council 917 15th Street, N. w.
Washington, D. c.
20005 U. s. Nuclear Regulatory Commission ATTN:
Jimmy L. Barker P. 0. Box 706 Morris, Illinois 60450 Susan N. Sekuler Assistant Attorney General Environmental Control Division 188 w. Randolph Street Suite 2315 Chic~go,.Illinois 60601 Morris Public library 604 liberty Street Morris, Illinois 60451 April 23, 1979
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ENCLOSURE 1 QUESTIONS FOR THE DRESDEN 2/3 SPENT FUEL POOL MODIFICATION
- 1.
Indicate what measures are being taken to insure the leak tightness of the annulus which encapsulates the Baral Poison material.
In addition, should a leak occur within the annular space containing Baral, and the cell should swell, indicate to what degree the fuel assembly stored therein would be damaged and what measures are being taken to detect such an inadvertent swelling.
Also indicate what measures would be taken to remove a stuck fuel assembly.
- 2.
Provide additional details showing the rack legs to support plate interface and a detail of the support plate. Indicate whether the racks utilize any interties for lateral support of the rack and whether rack-to-wall interties or bumper plates are used.
Provide the dimensions of all gaps.
Provide a detail depicting the top of one cell.
(e.g. Flared guide, straight, etc.).
- 3.
Provide a more detailed description. of the inter-tube welded connection; include drawings.
Specifically indicate the kind of weld made to obtain this structure.
- 4.
Provide the value of the "rattling factor" used in the seismic analysis.*
- 5.
Provide a description of the thermal gradient analysis considerations, include the thermal gradient considered and a discussion on why this was considered a conservative estimate of the worst case, i.e., the gradient between a full and empty cell.
- 6.
Justify not analyzing the storage racks for any live loads.
- 7.
Provide a description and drawings showing the location of the most critical fuel assembly drop.
Provide the maximum drop height used in the analysis.
Provide a listing of all other heavy objects which are transported over the pool and the potential damage to the fuel racks from the maximum energy of these objects at impact.
Discuss quantitatively the consequences of a fuel bundle dropping straight through the tube and impacting the bottom of the rack.
- 8.
For the analysis of the spent fuel pool racks provide the material properties and reference for the stainless steel used and from wbich the allowable stresses on Table 3.4-2 were derived.
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- 9.
Provide the response spectra utilized in the design of the spent fuel pool racks, also provide the significant frequencies, mode shapes and participation factors for the rack assemblies.
- 10.
Provide a discussion indicating the consequences to the fuel pool and the environment should the fuel pool liner be torn either during construction or during operation.
Discuss water makeup capabilities and repair procedures.
- 11.
Indicate whether the grid structures over the trenches in the pools have been analyzed for any accident conditions.
If so, provide the results. *Provide sketches showing the design of this structure.
- 12.
Describe the water chemistry which will be maintained in the spent fuel pool.
- 13.
Indicate the various materials that will be exposed to the spent fuel pool water environment and the consequences of corrosion of these materials in the pool water.
Identify any materials that have been heat treated during fabrication.
- 14.
Describe the qualification tests performed on the neutron absorber plates.
Discuss what effects temperature, radiation, and water chemistry have on the mechanical properties, densification (settling) stratification and neutron attenuation properties.
- 15.
Discuss the abilities on the neutron absorber plates to maintain their structural integrity during vibratory environments.
Are the plates counted on to carry and load.