ML19310A608
| ML19310A608 | |
| Person / Time | |
|---|---|
| Site: | 07001113 |
| Issue date: | 03/20/1980 |
| From: | Kaplan A GENERAL ELECTRIC CO. |
| To: | Partlow J NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 8006200544 | |
| Download: ML19310A608 (4) | |
Text
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~~ GENERAL (p) ELECTRIC NUCLEAR ENERGY PRODUCTS DIVISION WILMINGTON MANUFACTURING DEPARWENT CASTLE HAYNE ROAD P. O. BOX 780. WilA11NGTON, N. C. 28401. (919) 343-5000 h! arch 20, 1980
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Director
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Office of Nuclear h!aterial Saf ety & Safeguards AE80t
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U. S. Nuclear Regulatory Commission h
- '8 IAOOs C Washington, D. C.
20555
- dew, Attention:
!!r. James G. Partlow, Chief
/f hlaterial Control Licensing Branch g
Dear Sir:
References:
(1)
Letter, A. L. Kaplan to J. G. Partlow, 7/24/79 (2)
Telephone conversations, C. 31. Vaugt.~.n &
E. J. hicAlpine, 3/18/80
Subject:
!!ODIFICATION #4 TO APPLICATION Ah!ENDh!ENT S-8, PIIYSICAL INVENTORY OF UO2 PELLETS &
CERTAIN CONTAINERS OF SNh!
With respect to the amendment application referenced above and the recent telephone conversations with E. J. I'.cAlpine of your staff related to that application, attached is the information that hir. h!cAlpine requested.
General Ele.ric personnel would be pleased to discuss this matter further wion you and members of your staff as you may deem necessary.
Very truly yours, GENERAL ELECTRIC COh!PANY Arthur L.
Kaplan, hianager Licensing & Compliance Audits E!/C J26 ALK:bmw Attachment SGD-L i
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,1 >.p MRI1IER EXPLANATION OF SAM II CALIBRATION 1.C REFERENCES
. 1.
A. L. Kaplan to J. G. Partlow, " Modification 3* to Application Amendment S-8 Physical Inventory of U02 pellets and Certain Con-tainers of SMI", July 24, 1979.
2.
Telephone conversations of March 18, 1980, C. Vaughan and.
E. McAlpine.
2.0 CALIBRATIM
%e mfemnced submittal of July 24,.1979 contained a Section 6 describing the Age Compensated SAM II. 'Ihe equathn:
% E = A x 01 1 - B x 01 2 defines the calibration function for "old material" (non age compen-sated). Old material is defined as material over 90 days since con-version, the time requimd for the daughter products to attain equilibrium.
Calibration constants for A and B are 'detennined using the "old standards". Old standards consist of 11 cans of UO2 powder with certified enrichments spanning the range of 0.77% U-235 to 3.80%
U-235. A and B are detennined frun responses of thme five-minute counts on a high standard (i.e., 380) and a low standard (i.e., 0.77).
Sinultaneous equations:
High Standard Value = A OI 1 - B OI 2 low Standard Value = A-QI 1 - B-QI 2 are solved for the values of A and B.
'Ihe calibration is then veri-fled using a mid range standard.
Age compensation constants am also detennined as a part of each cali-bration. These constants were defined in the referenced subnitted by the equation.
R=axG2+b j
OI 1 contains the response of U-235 plus the interference. CII 2 con-tains the interfemnce. Age compensation is required because the interfering daughter pmducts begin at very low levels after conversion and gmw to equilibrium values within about 90 days. The G 2 response has the following foun:
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- +, * *
-01 2
-Xt 1-o Time +
as defined in basic physics. As a msult of the dau'ghter product growth, the non age compensated SMi II response will be of the following fom:
%E SMt Time = 90 days M
Std Value Time +
'Ihemfore, a good way to look at the age compensation phenomenon is as follows:
- % EMD
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% ESMI N
60 - 90 days j
i QI 2 Response versus time mp 2 of 3 i
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1he age conpensation constants am detennined fzun three five-ndnute counts of an old standard and a can of new material ( 1 week old) which is accurately characterized by lab measurements. A linear least squares program is used to determine a and b.
'Ib' appropriateness of these values is checked with a middle age standard.
Calibration checks using the old standards are perfonned during each shift of operation. If the calibration check is outside the control limit of 0.02% U-235 or if changes occur which could effect the instrument, a mcalibration is perfonned.
Calibration checks using old standards have been detennined to be adequate to contml the age compensated measurement system. This is justified because the calibration actually confirms by measurement the basic msponses dictated by physics. The only variable is the instrumentation and it is the same instrumentation which detennines A,B,a,b.
Therefore, once the instrument is calibrated all con-stants either lunain in calibration as verified by the check standards or loose calibration as evidenced by drift outside the 0.02% U-235 control limit.
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i 15338
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