ML20062K989
| ML20062K989 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 08/16/1982 |
| From: | Tauber H DETROIT EDISON CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| EF2-59-068, EF2-59-68, NUDOCS 8208180087 | |
| Download: ML20062K989 (5) | |
Text
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a Harry T.uber i n r and Conwuction Deholt Edison siissF5>e August 16, 1982 EF2 - 59,068 Mr. B. J. Youngblood, Chief Licensing Branch No. 1 DivisionHof Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555
Dear Mr. Youngblood:
Reference:
Enrico Fermi Atomic Power' Plant, Unit 2 NRC Docket No. 50-341
Subject:
Request for Additional Information by ETSB and CEB Regarding Onsite Storage of LLW 4
The attachments are submitted in response to your referenced request for additional information regarding the Onsite Storage Facility.
The Fermi 2 FSAR will be modified as indicated in the attachments in a forthcoming amendment.
Should you have any questions, please contact Mr. L.
E. Schuerman (313) 649-7562.
Sincerely, I
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r Attachments cc:
Mr. L. L. Kintner Mr. B. Little 8208180087 820816 PDR ADOCK 05000341 X
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ITEM 010.7.1 Standard Review Plan Section ll.4-Appendix A, provides design guidance for temporary'onsite storage of low-level radioactive waste.
One of the design objectives and criteria identified as applicable to solidified (or dewatered) and low-level dry radioactive waste storage facilities (as is the case with Fermi-2) is that the container integrity should be assured against corrosion from the external environment.
The PSAR states that the facility provides interim storage capacity for an amount of waste that is expected to be generated in 5 years of plant operations.
The FSAR does'not identify design features or operational procedures which serve to minimize the corro-sion of the waste containers, which could be stored for periods up to'five years.
Please describe the design and operational provisions for minimizing the corrosion of the waste containers due to the presence of moistura.
Response
The referenced criterion in SRP Section 11.4 - Appendix A has been met in that the waste containers will be stored inside a facility that is protected from the external environment.
The waste containers will be painted and scaled 55 gallon drums.
The storage facility has full-length trench drains in each storage cell to prevent the collection of water on the facility
' floor.
The maximum storage period is not expected to be more than five years, and thus, these measures are deemed adequate-to ensure container integrity.
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i ITEM'010.7.2 The FSAR' states that the drums are stacked verticall) in layers, with gratings placed on top'of each layer to stabilize"the next layer, to a height of eight layers.
Provide information to assure that the drums will retain their capability for meeting transportation and disposal' requirements in consideration of
.F the mechanical stresses. imposed by this method of stacking.
Response
The onsite storage facility (OSF) is designed for one-on-one drum stacking up to eight layers in height and with 1-inch thick steel grating between each layer.
The dry active waste will be stored in 18-gauge. DOT-17H-55-gallon drums, and the solidified waste will be s tored 'in-18-gauge DOT-17E 55-gallon drums.
Based on tests performed targent & Lundy, the-maximum compressive load, which
_-gauge DOT-17H drum can carry before-failure, is approximately 6,000 pounds., During i
storage, a 17H drum on the bottom layer (with seven layers
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above) will be subjected to a maxir.um comprdssive load of 3,395 pounds, which is only 57% of the f ailure load.
During storage of solidified waste, the 17E drumson the. bottom layer will be subjected to a maximum comprcss'iv'c load of'4,970 pounds.
Based on drum manufacturers' data, the maximum compressive load a DOT-17E drum can withstand be' fore' failure is210,000 pounds.
The maximum load that a 17E drum on the bottom' layer will be subjected to is only 50% of the fa'11ure load.
This provides us with confidence that eight-high drum stacking' is safe and justifiable.
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ITEM 021 35 You describe the fire protection provided for the new onsite storage facility in Appendix 11B of Amendment 42.
Verify that in accordance with Section C.7.N of BTP CMEB 9 5-1:
a.
The new storage facility will be separated from all other areas of the plant by three-hour fire-rated boundaries.
b.
An automatic sprinkler system in conformance with NFPA Standard 13 will be provided for all areas of the facility, except for the empty drum storage area and the control room, where the amount of in-situ combustibles is negligible.
c.
Smoke detectors are provided in all areas of the facility except for the radwaste storage areas, where all combustibles are contained in sealed steel drums.
Response
a.
There is no need for a three-hour fire barrier since the onsite storage facility is merely an extension of existing radwaste storage.
However, the onsite storage facility is separated from the radwaste building with a three-hour fire barrier except for the following:
-- The two conveyor openings to the radwaste building on the east wall are open.
These open-ings, however, do not impose a significant com-munication hazard because the areas are cut off by a 26 ft. concrete wall.
There are minimum combustibles in these cubicles since they are the receiving area for the conveyor carrying the sealed drums to the facility.
-- The door opening to the access aisle is a non-rated metal door.
However, the door leads to a corridor which is a low comubstible area.
b.
Automatic sprinkler protection is provided in all areas, in accordance with NFPA Standard 13, of the onsite storage facility except the control room, office area and corridor, and empty drum storage.
Combustible loading in these areas do not justify a suppression system.
c.
Ionization or thermal detection is provided in all areas of I
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(c. continued) the facility excep't,in the storage areas.
All com-bustible materints in the ctorage areas are contained within steel druins and are protected by an automatic sprinkler system.
In addition,.the sprinkler system alarms upon activation.
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