ML20203H200
| ML20203H200 | |
| Person / Time | |
|---|---|
| Site: | Framatome ANP Richland |
| Issue date: | 12/03/1997 |
| From: | Edgar J SIEMENS POWER CORP. (FORMERLY SIEMENS NUCLEAR POWER |
| To: | Weber M NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| JBE:97:172, NUDOCS 9712180341 | |
| Download: ML20203H200 (6) | |
Text
dun 5
sz]a]97 SIEMENS a
go-1.nJ December 3,1997 JBE:97:172 U.S. Nuclear Regulatory Commission Attn.: Mr A. F. Weber, Chief Licensint : ranch Division i Fuel Cycle Safety and Safeguards, NMSS Washington, DC 20555 Dear Mr. Weber
Subject:
Operations Scrap Warehouse Peferences:- 1. Letter, JB Edgar to MF Weber, " Operations Scrap Warehouse", dated July 14,
- 1997,
- 2. Letter, MF Weber to LJ Maas, " Adequacy of Siemens Power Corporation Submittals", dated November 4,1997, in reference 1 'iemens Power Corporation (SPC) requested an amendment to its materia's license to add the Operations Scrap Warehouse (Warehouso 7) to Table I 1.1 as a spccific location of an authorized activity, that activity beg the storage cf scrap and product containers which are extnrnally free of significant contamination and the loading of such containers into shipping containers and their unloading from shipping containers. The Operations Scrap Warehouse will be similar in construction and arrangement M the other SPC warehouses used for this activity. The warehouse will be located appioximately 100 feet due east of the south end of the UF. cylinder storage end handling facility.
On December 1,1997 Kim Hardin of your staff reiterated the NRC's position stated in reference 2 that the NRC had insuffblent information to muecendently assess the safety of the warehnuse in order to approve the amendment reouest. This letter is intended to provide the additionalinformation needed to complete the re;;ev and approval of the license amendment.
f Backarounns Historically, SPC's overflow storaga for uranium scrap has been in land-sea containers. Over the past several yearc, this storage has grown as more uranium is supplied as scrap and as SPC defines p,ofitable scrap uranium recovery opportunities. Presently, approximately 3,500 pails of uranium scrap occupy more than 40 land-sea containers on plant. Tha proposed warehouse has been designed to store up to 7,040 pails, allowing for twice our preste.t storage needs and for emptying the land-sea containers. SPC views this installation, which replaces the more ti an 40 land-sea containers with a well designed and controlled f acility, as a net improvement in overall I
plant safety. The rack design and layout will be essentially identical to those used in other SPC M
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. Mr *M. F. W:ber, Chl:f JBE:97:172 December 3,1997-Page 2 warehouscs which are included in our license. The amendment request is simply to add an additional location for a previously approved activity.
Protect Descriotion The steel frame structure will be 70 feet wide by 100 feet long on a six inch thick concrete ped, with a nominal eave height of 18 feet. Standard personnel doors will be provided at the north and south ends of the building. Two 12 foot wide standard roll up doors will be provided at the south end of the building for fork truck access. These roll-up doors will be provided with independent radio control operators, as well as the manual and electric controls inside the building. See enclosed drawing EMF 613,538 for floor plan and elevations.
The building will be fully insulated and provided with electric forced air heating units. No mechanical cooling will be provided. However, the insulation will provide a heat barrier in the summer.
iticality Safety Considerationt Criticality safety is provided as described in Chapters 4,14, and 15 of SPC's license application for warehouse storage of unmoderated materialin closed and externally free-of-significant contamloation containers. Specifically:
Containers (e.g, five gallon pails, inner containers from shipping containers, etc.)
will each be limited to a safe batch (mass control).
Containers will be verified to contain a maximum of 2 wt% water and equivalent additive prior to being put into storage (moderation control). Moderation controlis easy to maintain because :
=> There will be no water connections to the warehouse.
=> The fissile material stored in this warehouse is contained in closed steel containers.
Closed steel pails of scrap or product, four to a 25" by 25" steel pallet will be placed on steel storage racks.
The maximum dimensions of the pails will be 11.25" i.d. and 13.5" tall.
. Spacing will be mechanically maintained (spacing control) by the storage rack system. This designed spacing will be maintained during accident conditions because:
, => The racks are designed to withstand a Zone 2B earthquake, which is the classification applicable to the Rici,and area.
1 Mr. M. F. CAtb:r, Chi:;f JBE:97:172 December 3,1997 Page 3
=> Lie steel pallets keep the four steel containers approximately centered on a 25"x25" grid.
=> The racks are designed with a metal back to prevent containers from accidentally being pushed off of the rear of the shelves onto the floor.
=> The vertical spacing of the opsning between the shelves is such that double stacking of five gallon metal containere is not possible.
Each 10'6" long storage rack section will consist of floor storage plus four shelves.
Each shelf is four feet deep and vertically sepbrated by approximately 28 inches from other shelves with the bottom shelf aporo ately 29 inches from the floor if one ctorage rack section were to collapse, a maximum of 50 pallets (five wide by two decp on each shelf and on the floor) could be involved in f act, it is expected that l
the structural members of the racks will make it very difficult, if not impossible, to store five pallets wide per section. The most likely number will be four wide resulting in 40 pallets per rack section; however,50 pallets were assumed in the analyses. As a consequence, a total of 8,800 containers was analyzed compared to the expected warehouse capacity of 7,040 containers stated at ove and in reference 1. See enclosed drawing DS-DH-D36-97 for the proposed layout of the racks.
Note: The storage arrays in this wars house are essentially identical to those used in the existing approved storage warehouses at SPC.
The design and arrangement (
storage racks in this warehouse ensure that all of the criticality safety criteria req ired by the SPC license ( maximum k,,, of 0.95 under normal conditions and 0.97 under abnormal conditions) are met when subject to the limits and controls that will be imposed by the CSA for this warehouse.
Both UO powder and pellets are allowed to be stored in the Operations Scrap 2
Warehouse. SPC criticality analyses have shown. hat, at the given mass limits, the material density that results in full containers (powder) produces higher k,,, values than does higher density material (pellets) that result in partly full containers.
SPC's criticality safety personnel have also evaluated the impact of the following act ' Jens conditions:
=> Overbatched mass (8,800 individual and simultaneous errors)
=> Overbatched moderator (8,800 individual and simultaneous errors)
=> Collapsed racks (witti and without mass and moderator overbatching)
=> Spilled container contents onto the floor.
l l
4-Mr.* M. F. Wcb:r, Chi;f JBE:97:172 Decernber 3,1997 Page 4
- Summary k,n results for some of these conditions are included in the attached tables.
The condition not addrassed in the tables is that of spilled container contents. At 5%
enrichment,4g/cc density and 10 wt% water in UO powder, it would require more 2
than 250 kg of UO,in a fully reflected sphere to exceed a k,n of 0.95. This represents the contents of 14 pails.
As stated in previous correspondence, this new warehouse is monitored by SPC's criticality alarm system.
As previously stated, SPC views this installation as a net improvement in overall safety.
Additionally SPC has a commercial need to begin using this f acility by January 5,1998. Your assistance in expediting this review is greatly appreciated, if you require additionalinformation, please call me at 509-375-8663.
Very truly yours, 8
6m B. Edgar Staff Engineer, Licensing cc:
NRC Region IV WCl O
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per Pail-
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' Array N/ M s3OOf 2.12.OOO 3.0 42.0 2.0 0
0.82227 0.00212 0.82651 12x12x12 anay of pa!!ets.
Single batched mass and moderator.
s500f2,12.OOO 5.0 18.0 2.0 0
0.76124 0.00221 0.7656fi Same as above s3OOf 2.13.OOO 3.0 42.0 2.0 0
0.82565 0.00224 0.83013 Same as above, except 13x13x13 array.
l s500f2.13.OOO 5.0 18.0 2.0 0
0.76967 0.00255 0.77477 Same ans above.
s3OOf4.12.OOO 3.0 42.0 4.0 0
0.96118 0.00240 0.96598 12x12x12. Single batched mass and double batched total moderator.
7500f 4.12.OOO 5.0 18.0 4.0 0
0.84795 0.00241 0.85277 Same as above.
d3OOf 2.12.OOO 3.0 42.0 2.0 0
0.89702 0.00211 0.90124 12x12x12. Double basched
> mass and single batched
.' moderator.
d500f 2.12.OOO 5.0 18.0 2.0 0
0.88597 0.00245 0.89087 Same as above.
s3OOf2.12.100 3.0 42.0 2.0 100 0.76613 0.00221 0.77055 12x12x12. Single batched mass and moderator. Fuffy flooded.
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s500f2.12.100 5.0 18.0 2.0
~40 0.76443 0.00228 0.76899 Same as above.
i s3OOf 2sb.12.OOO 3.0 42.0 2.0 0
0.83108 0.00217 0.83542 12x12x12. Single batched mass and moderator. % of steel from pails includanj.
j s500f 2sp.12.OOO 3.0 47 0 2.0 0
0.81281 0 40241 0.81763 12x12x12. Single batefwxi mass and moderator. % of steel from pallets included.
A single rack section is assumed to hold 50 pallets. The evaluations assumed at least 1728 panets in a cubical array.
Note:
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