Text

Licensed Fuel Facility Status Report.Inventory Difference Data.January-June 1988.(Gray Book II)
	ML20248D219
Person / Time
Issue date:	03/31/1989
From:	; NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
To:	;
References
	NUREG-0430, NUREG-0430-V09-N01, NUREG-430, NUREG-430-V9-N1, NUDOCS 8904110417
	Download: ML20248D219 (14)
	v • d • e

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NUREG-0430 1

Vol. 9, No. I i

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LICENSED FUEL FACILITY STATUS REPORT i

INVENTORY DIFFERENCE DATA JANUARY 1988 JUNE 1988 UNITED STATES NUCLEAR REGULATORY COMMISSION

,p "%,,

89 331 U

0430 R ppg

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Available from l

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Superintendent 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.

Single copies of this publication are available from National Technical 3

Information Service, Springfield, VA 22161 j

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NUREG-0430 Vol. 9, No.1 LICENSED FUEL FACILITY STATUS REPORT INVENTORY DIFFERENCE DATA JANUARY 1988 JUNE 1988 l

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OFFICE OF NUCLEAR MATERIAL SAFETY AND SAFEGUARDS U.S. NUCLEAR REGULATORY COMMISSION WASHINGTON, DC 20555 i

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i ABSTRACT NRC is committed to the periodic publication of licensed fuel facilities' inventory difference data, after 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 (1) one effective kilogram of special nuclear material of low strategic significance, (ii) one effective kilogram of special nuclear material of moderate strategic significance, (iii) one effective kilogram of strategic special nuclear material contained in irradiated fuel reprocessing operations, or (iv) five formula kilograms of strategic special nuclear material.

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

Abbreviations.......................................................

vii Inventory Difference Data...........................................

I Definition of Terms................................................

3 Tabul ation of Inventory Di f ferences.................................

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l ABBREVIATIONS CFR Code of Federal Regulations FKG formula kilogram HEU high enriched uranium ID inventory difference 1

LEID limit of error of the inventory difference LEU low enriched uranium MUF material unaccounted for q

l NRC U.S. Nuclear Regulatory Cannission Pu-plutonium SEID standard error of inventory difference SNM special nuclear material S-R shipper-receiver SSNM strategic special nuclear material U-233 uranium-233 U-235 uranium-235 1

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v LICENSED FUEL FACILITY STATUS REPORT INVENTORY 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 oresented are for active, licensed facilities that are authorized to possess, in an unsealed form, at least one effective kilogram of SNM. The U.S. Nuclear Regulatory Commission (NRC) uses a graded approach in applying safeguards requirements for such licensees depending on the strategic signi-ficance of the possessed SNM. Licensees possessing significant quantities of j

high enriched uranium (HEU), plutonium, or uranium-233 are required to conduct 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-cance of low enriched uranium (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 W eificance. They include a formal structured system for material control and L.ounting 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 proteciton 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 nus,1 car materials are processed, particularly when chemical oper-ations are involved. These differences can result from variations in measuring and processing, measurement inaccurancy or imprecision, unmeasured flows from the process, unmeasured inventory, bookkeeping errors, loss or theft. Although an ID larger than its overall measurement uncertainty may signal an abnonnal 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 j

relies on infonnation 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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The concept of the limit of errc-of the inventory difference (LEID) is a method that licensees subject to 10 CFR 670.51 and NRC use to determine the significance of the ID. LEID is a calculated estimate of the measurement uncertainty (at the 95% Confidence Levei [C.L]) that is associated with the plant's ID. The ID should be less than the LEID 19 out of 20 times, if the ID results only from measurement uncertainty.

For 10 CFR 670.51 licensees, an ID that excet.ds its associated LEID may be an indication of processing problems, biased or etherwise inaccurate measurements, bookkeeping errors, loss or theft of material.

NRC accordingly requires licensees to take increasingly stronger investigative actions depending on how much the inventory difference exceeds both LEID and minimLm quantities specified in 10 CFR 674.13(b), (namely 200 grams of plutonium, 300 grams of uranium-235 contained in HEU, or 9,000 grams of uranium-235 contained in LEU). If the ID exceeds its LEID, but does not exceed the minimum quantities, no formal investigation is required.

i The concept of the standard error of inventory difference (SEID) is a method that the NRC and licensees subject to either 10 CFR 674.31 or 10 CFR 674.59 use to determine the significance of an ID.

For 10 CFR 674.31 licensees, SEID is a calculated estimate of the toal uncetainty (at the 67% C.L.) due to both measurement and non-measurement contributors. Thus, for 10 CFR 674.31 licensees, ID should be less than SEID two times out of three, or less than twice SEID 19 times out of 20. For 10 CFR 674.59 licensees, SEID is the calculated estimate of the measurement uncertainty (at the 67% C.L.) that is associated with an ID.

Hence, for 10 CFR 674.59 licensees, the ID should be less than SEID two times out of three, and less than twice SEID 19 times out of 20, if the ids result only from measurement uncertainties.

For 10 CFR 674.31 licensees (whose operations are limited to low enriched uranium), ID must exceed its threshold quantity (a site specific value that is considerably larger than SEID) before investigative action is required.

For 10 CFR 674.59 licensees, investigative actions are requi' ed whenever an ID exceeds both (1) 200 grams plutonium or uranium-233 or 300 grams uranium-235, and (2) three times SEID.

The ids for this reporting period (January 1 through June 30,1988) are indi-cated in the Tabulati:n 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.

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Definition 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 SNM, but does not include source i

material; or (2) any materia'i artificially enriched in any of the foregoing, but does not include source material.

2.

Source material:

(1)Naturaluraniumorthorium,ordepleteduranium, 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:

(1) uranium, (ii) thorium, or (iii) any combintion thereof. Source material does not include SNM.

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Effective kilogram of SNM:

(1) For plutonium and uranium-233, their weight 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(3) the square of its enrichment expressed as a decimal weight fraction; and for uranium with an enrichment in the isotope uranium-235 below 0.01 (1%)

but above.0071, its element weight in kilograms multiplied by 0.0001.

4.

Strategic special nuclear material: Uranium-235(containedinuranium l

enriched to 20 percent or more in the uranium-235 isotope), uranium-233.

j or plutonium.

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Isotope: A nuclide species of a chemical element (such as uranium or plutonium) whose atoms all have the same number of neutrons, as well as the same number of protons, within their nuclei. That is, all isotopes 4

I of a given element must have the same number of protons within the nuclei of their atoms, but the number of neutrons per nucleus varies between isotopes.

It is the number of protons, plus neutrons within an atom's nucleus that defines its mass number. U-233, U-235 and U-238 are all isotopes of uranium, having 141,143 and 146 neutrons, respectively, within the nucleus of each atom. The atoms of any uranium isotope will each have 92 protons within its nucleus.

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Highenricheduranium(HEUl: Uranium whose isotope content is 20 percent or more uranium-235 by weight.

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Low enriched uranium (LEU): Uranium whose isotope content is less than 20 percent by weight in combined U-233 plus U-235 content.

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) - (El + R).

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Limit of error of the inventory difference (LEID): Twice the standard error of the estimated measurement uncertainty associated with the inventory difference, or in other words, twice the square root of the measurement variance associated with the ID.

10. Standard error of the inventory difference (SEID):

(a) For licensees subject to 10 CFR 974.31, SEID is equal to the square root of the sum of both measurement and non-measurement variances associated with ID.

(b) For licensees subject to 10 CFR 674.51, SEID is equal to the square root of the measurement variance (only) associated with ID.

11. The inventory difference is deemed acceptable: The ID is less than l

Es associated LEID or SEID, and/or is less than 200 grams plutonium, j

contained in LEU (as appropriate).

12. The inventory difference falls within its applicable limit: The ID 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 LEID or SEID, but is less than ?.5 times the limit for LEID (for 10 CFR 570.51 licensees or less than the ID limit (for 10 CFR 574.31 and 10 CFR 674.59 licensees.

For 10 CFR 674.31 licensees, the ID limit is a site specific threshold quantity which is considerably larger than SEID.

For 10 CFR 574.59 licensees, the ID limit is three times SEID.

13. Negative inventory difference: A situation that occurs when the amount I

of material on hand, as determined by physical inventory, exceeds the amount of material being carried on the books (that is, there appears to j

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."

14. 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

+1D or ID (without designation of sign). A positive ID is also referred to as an "ID loss."

15. Shipper receiver difference (S-R difference): The arithmetic difference between the quantity of SNM measured by the shipper and the quantity measured by the receiver.

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BIBLIOGRAPHIC DATA SHEET I

3 NUREG-0430, Vol. 9, No. 1 ses NsTRUCT.0=s O= Twi Rev Rs 2 TITLt AN0 lueflTLE 3 LE AVE BLANE Licensed Fuel Facility Status Report f

j Inventory Difference Data

. DAT R, ORT COM, lated j

January 1988 - June 1988 MONin j

, EAR i auYaOaisi January 1989 6 DATE REPORT issued MONTH Y E A 81 March 1989 i

7. 6 tRf 0RMING ORGAN 12 A TION NAME AND M AILING ADD 5lE58 (#wJwer /W Co#/

8 PROJECT /7 AsE/ WORK UNIT NUMSER Office of Nuclear Material Safety and Safeguards

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U.S. Nuclear Regulatory Commission i

Washington, D.C.

20555 to SrON50 RING ORGANi2 ATION NAME AND MAILING ADDRESS ifw&de lW Cases tia TYPE OF REPORT i

Status Summary Report Same as 7. above.

"'"Cv'"'D*'"'**'"'

January, 1988 - June 30, 1988 l) $wPPLEMENT ARY NOTE 5 13 185'rR ACT (200

ores or den 1 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 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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le DOCUMENT ANAL Y&#$. e ElvwORD5/DESCRIPTOR5 19 AV AIL AtiLl"

STATEMENT nuclear fuel facilities inventory difference data Unliaited i

16 SECUF.TV CLAS$tFICATION SM,el

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ML20248D219

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