ML20238A748

Licensed Fuel Facility Status Report.Inventory Difference Data.July-December 1986.(Gray Book II)

ML20238A748
Person / Time
Issue date:	08/31/1987
From:	NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
To:
References
NUREG-0430, NUREG-0430-V07-N02, NUREG-430, NUREG-430-V7-N2, NUDOCS 8709090409
Download: ML20238A748 (14)

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NUREG-0430 101.7,No.2 LICENSED FUEL FACILITY STATUS REPORT INVENTORY DIFFERENCE DATA JULY 1986 - DECEMBER 1986 UNITED STATES NUCLEAR REGULATORY COMMISSION p' arco b

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NUREG-0430 Vol. 7, No. 2

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LICENSED FUEL FACILITY STATUS REPORT INVENTORY DIFFERENCE DATA Jul.Y 1986 DECEMBER 1986 Manuscript Completed: June 1987 Date Published: August 1987 0FFICE OF NUCLEAR MATERIAL SAFETY AND SAFEGUARDS U.S. NUCLEAR REGULATORY COMMISSION WASHINGTON, DC 20555 p ..... ,

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ABSTRACT , .

NRC is committed to the periodic publication 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 fabrication facilities possessing more than one effective kilogram of high enriched uranium, low enriched ura- .

nium, plutonium, or uranium-233.

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CONTENTS Page Abstract............................................................. iii .

Abbreviations........................................................ vii Inventory Difference Data ........................................... 1 De f i n i t i on s o f Te rm s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Tabulati on of Inventory Di fference.s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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ABBREVIATIONS CFR Code of Federal Regulations HEU high enriched uranium ID inventory difference LEID limit of error of the inventory difference LEU low enriched uranium MUF material unaccounted for NRC U.S. Nuclear Regulatory Commission Pu plutonium SNM special nuclear material S-R shipper-receiver U-235 uranium-235 vii

LICENSED FUEL FACILITY STATUS REPORT UlVENTORY DIFFERENCE DATA Inventory Difference Data An inventory difference (ID), also referred to as material unaccounted for (MUF),

is the difference between the quantity of special nuclear material (SNM) that a licensee's accounting records show should be on hand and that which a licensee's physical inventory shows is actually on hand.

The ID data presented are for active, licensed facilities that are authorized to possess, in an unsealed form, at least one effective kilogram of special nuclear material (that is, high enriched uranium (HEU), plutonium, and ura-nium-733) or at least one effective kilogram of low enriched uranium (LEU).

For example, LEU is the nuclear fuel used in commercial light-water nuclear power reactors. The U.S. Nuclear Regulatory Commission (NRC) requires licen-sees possessing significant quantities of HEU, plutonium, or uranium-233 to conduct an inventory every 2 months. Licensees possessing one effective kilo-gram of low enriched uranium are required to inventory every 12 months.

It is important to understand the distinction between the low strategic signifi-cance of LEU and the higher strategic significance of HEU and plutonium. Most LEU is enriched to a level of 1 to 4 percent in the isotope uranium-235. At this level of enrichment, the uranium is not capable of sustaining the kind of nuclear reaction that takes place in a nuclear explosion.

NRC safeguards requirements covering LEU are graded to reflect its low strate-gic significance. They include a formal structured system for material control and accounting and basic industrial security measures. On the other hand, because of the higher strategic significance of HEU and plutonium, NRC requires licensees to provide substantial physical protection of this material in addition to controlling and accounting for it. Physical protection of this material includes safeguards measures such as barriers, intrusion alarms, armed guards, and offsite police response capabilities. Internal systems to control the move-ment of HEU are also required.

' ids arise when nuclear materials are processed, particularly when chemical oper-ations are involved. These differences can result from variations in measuring and processing, measurement inaccuracy or imprecision, unmeasured flows from the process, unmeasured inventory, bookkeeping errors, or loss or theft. Although an ID larger than its overall measurement uncertainty may signal an abnormal i situation requiring determination of the cause, the fact that an ID falls within its associated limit of error--even an ID of zero--provides no automatic or con-clusive proof that loss or theft of material has not occurred. Therefore, NRC 1 relies on information provided not only by the material accounting system but also by the internal control system, the physical security system, NRC inspec-tions and evaluations, and NRC and licensee investigations.

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l The concept of the limit of error of the inventory difference (LEID) is a method that licensees and NRC currently use to determine the significance of the ID. LEID is a calculated estimate of the measurement uncertainties that are associated with a plant's processing activity. The ID should be less than the LEID 19 out of 20 times, if the ID results only from measurement uncertainty.

Because an ID that exceeds its associated LEID may be an indication of process-

'ing problems, biased or otherwise inaccurate' measurements, bookkeeping errors, or loss or theft of material, NRC accordingly requires licensees to take increas-ingly stronger investigative actions depending on how much the inventory dif-ference exceeds both LEID and minimum quantities specified in 10 CFR 674.13(b),

(namely. 200 grams of Pu, 300 grams of U-235 contained in HEU, or 9,000 grams ofU-235containedinLEU). If the ID exceeds its LEID, but does not exceed the minimum quantities, no formal investigation is required. However, the licensee is required to try to determine why the ID exceeded the LEID.

The ids for this reporting period (July 1 through December 31,1986) are indi-cated in the Tabulation of Inventory Differences that begins on page 5 of this report. An explanation of the significance, and in some cases, the source of the ids is included in the last column of the table. None of the ids was such as to require an NRC investigation.

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3 Definitions of Terms 1.. Special nuclear material (SNM): (1) Plutonium, uranium-233, uranium enriched in the, isotope uranium-235, and any other material that the' Commission, pursuant. to the provisions of Section 51 of the Atomic Energy.

Act of 1954.. as amended,; determined to be-special nuclear material, but-does not include source material; or (2) any material artificially enriched'

,in any of the foregoing, but~ does not include source material.

2. ' Source material: (1) Uranium or thorium, or any combination thereof, in

'any physical twentieth or percent'.(0.05%)

of..one chemical form or or.(2)moreoresof: which

'(1) uranium, containii) by(weight thorium, one-or'  ;

.(iii) any combination thereof. Source material doet' not include special nuclear material. ,

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' 3. . Effective kilogram of s)ecial nuclear material: (1) For plutonium and uranium-233,-their weigit. in kilograms; (2) for uranium with an' enrichment in the isotope uranium-235 of 0.01 (1%) and above, its element weight in kilograms multiplied by the s mal weight fraction; and (3) for quare of itswith uranium enrichment an enrichment expressed in the.as a deci-isotope uranium-235 below 0.01 (1%), its' element weight .in tilograms multiplied by-0.0001.

4. Strategic special nuclear material: Uranium-235 (contained in uranium enrichedto20percentormoreintheU-235 isotope), uranium-233,orplu-tonium.

- 5. Isotope: One of two or more atoms with the same number of protons, but different numbers of neutrons in their nuclei.

6. High enriched uranium (HEU): Uranium whose isotope content is 20 percent or more uranium-235 by weight.

7. Lowenricheduranium(LEU): Uranium whose isotope content is less than 20 percent uranium-235 by weight.

8. Inventory difference (ID): The arithmetic difference between a book inven-tory-and the corresponding physical inventory, calculated by subtracting ending inventory (EI) plus removals (R) from beginning inventory (BI) plus

. additions (A). Mathematically, this becomes ID = (BI + A) - '(EI + R).

9. Limit of error of the inventory difference'(LEID): Twice the standard error of the estimated measurement uncertainty associated with the inventory difference.

10. "The inventory difference falls within the applicable regulatory limit":

The ID does not exceed both LEID and the minimum quantities specified in l

10 CFR $74.13(b).

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11. Negative inventory difference: A situation that occurs when the amount of material on hand, 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 -ID or is shown in parentheses. A negative ID is also referred to as an "ID gain."

' 12. Positive inventory difference: A situation that occurs when the amount

' of material on hand, as determined by physical inventory, is less than the amount of material being carried on the books (that is, there appears to be a loss of material). Mathematically, a positive ID is written as

+ID or ID (without designation of sign). A positive ID is also referred l

to as an "ID loss."

13. Shipper-receiver difference (S-R difference): The arithmetic difference between the quantity of special nuclear material measured by the shipper and the quantity measured by the receiver.

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u. .N TRUCTION ON , RivtRis NUREG-0430, Vol. 7. No. 2 /

3. Tif LE AND SV8 TITLE 3 LE AVE BLANK Licensed Fuel cility Status Report Inventory Diffe ce Data July 1986 - Decem r 1986 [

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