ML20154M556
| ML20154M556 | |
| Person / Time | |
|---|---|
| Issue date: | 09/30/1988 |
| From: | NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | |
| References | |
| NUREG-0430, NUREG-0430-V08-N02, NUREG-430, NUREG-430-V8-N2, NUDOCS 8809290026 | |
| Download: ML20154M556 (16) | |
Text
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NUREG 0430 Vol. 8, No. 2 l LICENSED FUEL FACILITY STATUS REPORT i
t INVENTORY DIFFERENCE DATA l
JULY 1987 DECEMBER 1987 l
UNITED STATES NUCLEAR REGULATORY COMMISSION r
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Available from
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Sur:rintendent of Documents U.S. Government Printing Office Post Office Box 37082 Washington, D.C. 20013 7082 A year's subscription consists of 2 issues for this publication.
Sing!e copies of this publication are available from National Technical Information Service, Springfield, VA 22161 e
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NUREG 0430 Vol. 8, No. 2 LICENSED FUEL FACILITY STATUS REPORT INVENTORY DIFFERENCE DATA JULY 1987 DECEMBER 1987 Va% writ Cemc!eted Jeet 19!!
Date FotKhed Se;temb*r 19?!
0FFICE OF NUCLEAR MATERIAL SAFETY AND SAFEGUARDS U.S. NUCLEAR REGULATORY COMMISSION CASHINGTON DC 20555
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ABSTRACT NRC is cCreitted to the periodic rublication of licensed fuel facilities' inventory difference data, following agency review of the information and completion of any related investigations. Information in this report includes inventory difference data for active fuel fabricatier facilities possessing more than one effective kilogram of high enriched uranium, low enriched ura-nium, plutentum, or uranium-233, iii
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CONTENTS 1
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iii Abstract.............................................................
vii Abbreviations........................................................
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Inventory Difference Data...........................................
3 Cefinitions of Terms...............................................,
5 Tabulation of Inventory Differences..................................
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ABBREVIATIONS CFR Code of Federal Regulations HEU high enriched uranium 10 inventory difference LEID limit of error of the inventory difference LEU Icw enriched uranium MUF material unaccounted for NRC U.S. Nuclear Regulatory Coenissien Pu plutonium SF.10 standard error of inventory difference SN>t special nuclear r,aterial S-R shipper-receiver U-235 urant un:-235 vii
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LICENSED FUEL FACILITY STATUS REPORT l
INVENTORY O!FFERENCE DATA i
Inventory Difference Data I
An inventory difference (10) also referred to as material unaccounted for (MUF).
i is the uifference between the quantity of special nuclear material (SNM) that a
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licensee's accounting records show should be en hand and that which a licensee's physical inventory shows is actually on hand.
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The 10 data presented are for active, licensed facilities that are authorized l
to possess. in an unsealed form, at least one effective kilogram of SNM. The i
i U.S. Nuclear Regulatory Comission (NRC) uses a graded approach in applying
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safeguards requirements for such licensees depending on the strategic signi-l ficance of the possessed ShM. Licensees possessing significant quantities of j
high enriched uranium (HEU) plutonium, or uranium 233 are required to conduct j
t physical inventories every two months. Facilities possessing one or more effective kilograms of SNM of moderate strategic significance conduct inventories every six months, while licensees whose holdings are restricted to SNM of low strategic significance perform physical inventories every 12 months.
It is important to understand the distinction between the low strategic signifi-j cance of 3e, enriched uranium (LEU) and the higher strategic significance of HEU ard plusoniJm. Most 1.EU is enriched to a level of 1 to 4 percent in the isotope uranium-235. At this level of enrichment, the urantun is not capable of I
sustaining the kind of nuclear reaction that takes place in a nuclear explosion.
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NRC safeguards requirements covering LEU are graded to reflect its low strate-gie significance.
'! hey Include a formal structured system for material control and accountinn and basic industrial security measures. On the other hand.
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because of the higher strategic significance of HEU and plutonium. NRC requires licensees to provide substantial physical protection of this material in addition j
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%o controlling and accounting for it. Physical protection of this material t
includes safeguards measures such as barriers, intrusion alarms, armed guards, l
Ond offsite police response capabilities. Internal systems to control the move-l ment of HEU are also required.
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l ids arise when nuclear materials are processed, particularly when chemical oper-i ations are involved. These differences can result from variations in measuring and processing, measurement inaccuracy or imprecision, unmeasured flows from the process, unreasured inventory, bookkeeping errors, loss or theft. Although en ID larger than its overall measurement uncertcinty may signal an abnonnal
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situation requiring determination of the cause. the fact that an 10 falls within j
its associatad limit of error--even an 10 of zero-provides no autoestic or con.
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l clusive proof that loss or theft of material has not occurred. Therefore. NRC relies on information provided not only by the material accounting system but I
also by the internal contrcl system. the physical security system. NRC inspec-I tions and evaluations, and NRC ar.d licensee investigations.
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1 The concept of the limit of error of the inventory difference (LEID) is a method that licensees subject to 10 CFR 70.51 and NRC use to determine the significance of the 10. LEID is a e,alculated estimate of the measurement uncertainty (at the 951 Confidence Level [C.L.)) that is associated with the plant's 10. The ID should be less than the LE!D 19 out of 20 tires, if the ID results only from measurement uncertainty.
For 10 CFR 170.51 licensees, an 10 that exceeds its associated LE!D may be an indication of processing problems, biased or otherwise inaccurate rseasurements, 4
bookkeeping errors, loss or thef t of material. NPC accordingly requires licensees to take increasingly stronger investigative actions depending on how much the inventory difference exceeds both LEID and minimum quantities specified in 10 CFR 574.13(b). (namely. 200 grams of plutonium. 300 grams of uranium-235 contained in HEU. or 9,000 g' rams of uranium-235 contained in LEU).
If the ID exceeds its LE!D, but does not exceed the minimum quantities, no fermal investigation is required. However, the licensee is required to try to determine why the 10 exceeded the LEID.
The concept of the standard error of inventory difference (SE!D) is a method
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that the NRC and licensees subject to either lu CrR 674.31 or 10 CFR 674.59 l
use to determine the significance of an 10.
For 10 CFR 674.31 licensees. SE!D is a calculated estimate of the total uncertainty (at the 671 C.L.) due to both i
reasurement and non-reasurement contributors. Thus, for 10 CFR 674.31 licensees.
ID should be less than SEID two times out of three, or less than twice SE!D 19 tires out of 20. For 10 CFR 574.59 licensees SE!D is the calculated estimate of the measurement uncertait ty (at the 671 C.L.) that is associated with an 10.
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Hence, for 10 CFR 574.59 licensees, the ID should be less than SE!D two times 4
out of three, and less than twice SEID 19 times out of 20 if the ids result only from measurement uncertainties.
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For 20 *FR 17/.11 Ilcensees (whose operations are limited to low enriched uraniura). !D nmst excM it,s threshold quantity (a site specific value that is considerab'53 tif:ensees. investigative acticns are required whenever an ID v 1.srger than SE!D) before investigative action is required. For 10 CFR 574.
4' exceeds botn (a) 200 grams plutonium or uranium-233 or 300 grams uranium-235, and (i'l three time SE!D.
J The ids for this reporting period (July 1 through Dectcber 31,1907) are indi-1 cated in the Tabulatim of Inventory Differences that begins on page 5 of this re r t.
An explanation of the significance, and in scce cases, the source of
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the ids is included in the last column of the table.
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Definitions of Terms 1.
Special_ nuclear material (SNM): (1) Plutonium, uranium-233 uranium er,riched in the isotope uranium-235, and any other material that the Commission, pursuant to the provisions of Section 51 of the Atomic Enr.rgy Act of 1954, as amerded, deterinined to be ShM. but does nnt include source material; or (2) any meterial artificially enriched in any of the foregoing, i
but does not include source material.
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, Source material: (1) Uranium or thorium, or any combination thereof, in any physical or chemical form or (2) ores which contain by weight one-twentieth of one percent (0.05%) or more of: (i) uranium. (ii) thorium.
or (iii) any combinatien thereof. Source material does not include SNH.
Effective kilogram of SNM:
(1) For plutonium and uranium-233, their wei
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inkilograms;(2)foruraniumwithanenrichmentintheisotopeuraniumgnt 235
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of0.01(15)andabove.Itselementweightinkilogramstrultipliedby(3) the 1
squarc of its enrichment expressed as a decimal weight fractioni and for uranium with an enrichment in the isotope uraniufn-235 below 0.01 (1%).
i its element weight in kilograms multiplied by 0.0001.
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Strategic special nuclear material: Uranium-235 (contained in uranium
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enriched to 70 percent or more in the uranium-235 isotope), uranium-233
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1 or plutonium.
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I s o._t_op_e : One of two or more atoms with the same nutrber of protons, but l
BTfferent nurr.bers of neutrons in their nuclei.
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High enriched uranium (HEU): Uranium whose isotope content is 20 percent
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f or more uranium-235 by weight.
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Lowenricheduranium(LEM: Uranium whose isotcpe content is less than l
70 percent uranium-235 by weight.
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8.
_Invento r difference (1D): The arithmetic difference betweer, c book inven-
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tory an the corresponding physical inventory. calculated by sbbtracting l
l ending inventory (EI) plus removals (R) from beginning irventory (BI) plus i
additions (A). N3 thematically, this becomes i
10 = (B1 + A) - (El + R).
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Limit of error of the inventory difference (LEID): Twice the standard error l
of the estimated measurement uncertainty associated with the inventory l
oifference, f
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- 10. Standard error of the inventory difference (SEID):
(a) For licensees subject to 10 CFR 974.31. SEIII is equal to the square root of the sum of both measurement and non-measurement variances associated with 10.
(b) For licensees subject to 10 CFR $74.51, SE!D is equal to the square root of the measurement variance (only) associated with 10.
- 11. The inventory difference is deemed acceptable: The ID is less than its associated LEID or SElb. and/or is less than 200 grams plutonium.
300 grams uranium-235 contained in HEU or 9000 grams uranium-235 contained in LEU (as appropriate).
- 12. The inven_ tory difference falls within its applicable limit: The ID L
exceeds both (1) 200 grams plutonium. 300 grams uranium-235 contained in HEU or 9000 grams uranium-235 contained in LEU. and (2) its associated LE!D or SEID. but is less than 1.5 times the limit for LEID (for 10 CFR 570.51 licensees) or less than the ID limit (fer 10 CFR $74.31 and 10 CFR 574.59 licensees).
For 10 CFR $74.31 licensees, the ID limit is a site specific threshold quantity which is considerably larger than SE!D. For 10 CFR $74.59 licensees, the 10 limit is three times SEID.
- 13. Neg_ative inventory difference: A situation that occurs when the amount oT material onTand, as determined by physical inventory, exceeds the amount of material being carried on the books (that is, there appears to be a gain of material). Mathematically, a negative ID is written as -!D or is shown in parentheses. A negative 10 is also referred to as an "!D gain."
- 14. Positive inventory difference: A situation that occurs when the amount of material on hand, as detennined by physical inventory, is less than i
the attunt of material being carried on the books (that is, there appears I
to be a loss of material). Mathematically, a positive ID is written as l
+1D or ID (without designation of sign). A positive 10 is also referred l
l to as an "!D loss."
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- 15. Shipper-receiver difference (5-R difference): The aritteetic difference l
between the quantity of ShM measured by the shipper and the quantity i
j mea:,ured by the receiver, i
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Tabulation of Inventory Dif ferences Inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM-Type Date U-235 or Pu)
Explanation Advanced Nuclear fuels 1227 LEU 7/31/87
-3474 The inventory difference is deemed Corp.
acceptable.
Richland. EA Babcock & Wilcox.
42 HEU 8/30/87 8-09 The inventory difference is deemed Naval Nuclear Fuel acceptable.
Div.,
Lynchburg, VA HEU 10/31/87 397 The inventory difference is deemed acceptable.
HEU 12/31/87
-363 The inventory difference is deemed m
acceptable.
liabcock & Wilcox.
1163 LEU 11/11/87 1.182 The inventory difference is deemed Greercial Luclear acceptable.
fuel Plant.
Lynchburg, VA Cintichem. Inc.
639 HEU 7/1/87
-40 The inventory difference is deemed Tuxedf. hY acceptable.
HEU 8/31/87 14 The inventory difference is deemed acceptable.
hEU 11/4/87
-39 The inventory difference is deemed acceptaole.
Inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM -
Type Date U-235 or Pu)
Explanation The licensee was not required to Cmbustion Engineer-33 LEU conduct an inventory during this period.
ing. Hematite. M0 The licensee was not required to Cabustion Ecgineer-1067 LEU conduct an inventory during this period.
ing. Windsor. CT General Aton.ics.
696 FIU 7/20/87 IU The inventory difference is deemed acceptable.
La Jolla. CA Pu 7/20/87 0
The inventory difference is deemed acceptable.
U-233 7/20/87 0
The inventory difference is deemed e
acceptable.
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Pu-238 7/20/87 0
The inventory difference is deeced acceptable.
HEU 9/21/87
-5 The inventory difference is deemed acceptable.
Pu 9/21/87 0
The inventory difference is deemed acceptable.
Pu-238 9/21/87 0
The inventory difference is deemed bcceptabic.
U-233 9/21/87 0
The inventory differene.e is deemed acceptable.
j LEU 9/21/87
-56 The inventory difference is deemed acceptable.
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Difference i
Licensee Material Inventory (Grams of l
Licensee No. SMM-Type Date U-235 or Pu)
Explanation I
Gensral Atomics, 696 HEU 11/16/87
-2 The inventory difference is deemed La Jolla CA acceptable.
Pu 11/16/87 0
The inventory difference is deemed acceptable.
U-233 11/16/87 0
The inventory difference is deemed acceptable.
Pu-238 11/16/87 0
The inventory difference is deemed acceptable.
1 Gereral Electric.
1097 LEU 8/3/87 56,206 The inventory difference is deemed Wilmington, NC acceptable.
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t.uclear fuel 124 HEU 8/12/87
-2537 The inventory difference falls l
Services Erwin, TN within its applicable Ifmit.
i HEU 10/14/87 1550 The inventory difference falls within its applicable limit.
HEU 12/16/87 2872 The inventory difference falls within its appifcable limit.
LEU 12/31/87
-67 The inventory difference is deered acceptable.
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Inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM-Type Date U-235 or Pu)
Explanation Roc 6well International 21 HEU 7/31/87 0
The inventory difference is deemed acceptabie.
Santa Su una CA LEU 7/31/87 0
The inventory difference is deemed acceptable.
Pu 7/31/87 0
The inventory difference is deemed acceptable.
HEU 9/30/87 0
The inver. tory difference is deemed acceptabic.
LEU 9/30/87 0
The inventory difference is deemed co acceptable.
e Pu 9/30/87 0
The inventory difference is deered acceptable.
HEU 11/30/87 0
The inventory difference is deemed acceptable.
Pu 11/30/87 0
The inventory dif f erence is deemed
.ccer.able.
LEU 11/30/87 0
The inventory differecce is deemed acceptable.
United Nuclear Corp.,
368 HEU 7/17/87 241 The inventory difference is deemed acceptabic.
Montville. ET HEU 9/18/87 173 The inventory difference is deer.ed acceptable.
HEU 11/20/87 127 The inventory difference is deemed acceptable.
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BIBUOGRAPHIC DATA SHEET u....r ver,osio.a..ai,i...
NUREG-0430, Vol. 8. No. 2 3 1, a.~o..,, r a a a a.s.w Licensed Fuel Facility Status Report inventory Difference Data July 1987 December 1987 g
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June 1988
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O'fice of Nuclear Material Safety and Safeguards
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U.S. Nuclear k,ulatory Comission Washington, D.C.
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Status Sumary Report Same as No. 7, above July 1, 1987 - December 1987 o is a s,...
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NRC is committed to the periodic publication of 'icensed fuel facilities' inventory difference data, following agency review of the information and completion of any related NRC investigations.
Information in this report includes inventory difference data for active fuel fabrication facilities possessing more than one effective kilogram of high enriched uranium, low enriched uranium, plutonium, or uranium-233.
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l..itwts nuclecr fuel facilities inventory difference data Unlinited
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UNITED STATES meiit,WAN CLAS$ AAf f NUCLEAR REGULATORY COMMISSION
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WASHINGTON, D.C. 20566
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