ML20024A636
| ML20024A636 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 06/08/1983 |
| From: | Crow W NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Harrison J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8306210443 | |
| Download: ML20024A636 (3) | |
Text
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JUN 8 1983 1
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MEMORANDUM FOR: John Harrison, Chief. Section 2 j
Midland, Region III FROM:
W. T. Crow, Section Leader Uranium Process Licensing Section Urantun Fuel Licensing Branch
SUBJECT:
CONSt#tER POWER-MIDLAND UNITS 1 and 2. PART 70 LICENSES FOR UNIRRADIATED FUEL STORAGE A condition in the proposed subject licenses will require CPC to check the spent fuel racks periodically to verify the continued presence and effective-ness of Boraflex as a neutron poison. An initial check will be made by CPC before fuel is inserted into the racks. This check would ascertain that the Boraflex sheets contain the materials as specified in CPC's response to our questions (see enclosures), and that the Boraflex is present in accordance with rack design. I request that Region III inspect the CPC program for adequacy befbre fuel receipt is authorized. My staff has discussed dihis with l
Ron Cook, Sr. Resident Inspector.
As a related issue, we understand that the remedial soils work is proceeding.
We would appreciate knowing the forecast date when Region III would have no objection to issuance of the Part 70 licenses.
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W. T. Crow, Section Leader Uranius Process Licensing Section Uranium Fuel Licensing Branch Division of Fuel Cycle and Material Safety,19455 i
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Enclosures:
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- 4 SPENT FUEL POOL NRC Request No 1 An expanded drawing of Q&R Figure 4A-1 of Exhibit B-IV (spent fuel stocage racks). We are especially interested in whether there are one or two Boraflex sheets between assemblies.
Response
{0 ie There are two sheets of Boraflex between each. fuel assembly.s This is depicted by the poison insert assembly (elevation view) in enclosed Drawing 140-8, Q, Rev 2.
The drawing's List of Materials provides the nominal dimensions of each of the Boraflex sheets. -The poison insert assemblies (shown in Drawing 140-9, Q, Rev 3) are positioned between the fuel storage rack boxes as depicted in Drawings 140-2, Q, Rev 8; 140-3, Q, Rev 6; 140-4, Q, Rev 6; 140-5, Q, Rev 6; and 140-10, Q, Rev 2.
Details of the fuel storage rack boxes are provided by Drawing 140-6, Q, Rev 9.
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5 SPENT FUEL POOL NRC Request No 2 The physical and chemical properties of the Boraflex used in the spent fuel racks, including the density and weight percentages for different elements and compounds.
Response
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TheBoraflexusedinthespentfuelracksconsistsofaboroncarbide{BC4)he I"
a matrix of silicone polymer with an average B10 loading of 0.020 g/cm T
average elemental composition of the Boraflex expressed in weight percentage is as follows (each accurate within 2%):
Element (wt %)
Boron 38.0 Hydrogen 2.3 0xygen 18.5 Silicon 20.5 Carbon 20.7' The average density for this type of Boraflex used in the racks is 1.75 g/cc.
Physical dimensions for the Boraflex sheets used are provided in Drawing 140-8, Q, Rev 2 (see Response to Request No 1 above).
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