ML20195H360

Licensed Fuel Facility Status Report.Inventory Difference Data.July 1, 1996 - June 30, 1997.(Gray Book II)

ML20195H360
Person / Time
Issue date:	11/30/1998
From:	Tom Pham NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
To:
References
NUREG-0430, NUREG-0430-V17, NUREG-430, NUREG-430-V17, NUDOCS 9811230334
Download: ML20195H360 (18)

Text

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NUREG-0430

Vol.17 Licensed Fuel Facility l l Status Report l l'

l l Inventory Difference Data

July 1,1996 - June 30,1997 i l

l U.S. Nuclear Regulatory Commission i

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t AVAILABILITY NOTICE )

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NUREG-0430 Vol.17 Licensed Fuel Facility Status Report i

l Inventory Difference Data July 1,1996 -' June 30,1997 Manuscript Completed: September 1998 Date Published: November 1998 T. N. Pham Office of Nuclear Material Safety and Safeguards U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

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! ABSTRACT 1

The U.S. Nuclear Regulatory Commission is committed to an annual publication of licensed fuel cycle facility inventory difference data, following Agency review of the information and completion of any related investigations. Information in this report includes inventory difference results for active fuel fabrication facilities possessing more than one effective kilogram of special nuclear material.

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1 CONTENTS Eage

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- Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii Abbreviations / Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

-1. I ntrod u ction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3. Con cl us ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

4. Definition of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

5. Tabulation of inventory Differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 v NUREG-0430, Volume 17

ABBREVIATIONS / ACRONYMS C.L. Confidence level a

CFR Code of Federal Regulations FKG Formula Kilogram (s)

HEU High-enriched uranium ID Inventory difference LEID Limit of error of an inventory difference

, LEU Low-enriched uranium NRC Nuclear Regulatory Commission Pu Plutonium SEID Standard error of an inventory difference i SM- Source material SNM Special nuclear material SSNM Strategic special nuclear material l U-233 Uranium-233 U-235 Uranium-235 l

l Pu-238 Platonium-238 Pu-239 Plutonium-239 Pu-241 Plutonium-241 l

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, vii NUREG-0430, Volume 17

LICENSED FUEL FACILITY STATUS REPORT ANNUAL REPORT OF INVENTORY DIFFERENCE DATA NUREG-0430, VOLUME 17

1. INTRODUCTION The Licensed Fuel Facility Status Report (NUREG-0430)is a periodic report that provides inventory information on NRC-licensed fuel cycle facilities. The information included in NUREG-0430 consists of a tabulation of inventory difference data for all active fuel cycle facilities, a list of acronyms, and a glossary of various term definitions used throughout this publication. The first semiannualissue of NUREG-0430 was published on May 16,1978. With the second issue of Volume 9 published in April 1990, the NRC changed to a one-year interval because most of the licensed fuel cycle facilities were on an annual inventory frequency.

All fuel cycle facilities authorized to possess and use more than one effective kilogram of special nuclear material (SNM) are required to report the results of each physical inventory to the NRC pursuant to 10 CFR 74.17. This report contains a tabulation of physicalinventory results generated during the one-year period from July 1,1996, to June 30,1997, for the eight active fuel fabrication facilities.

2. DISCUSSION The NRC uses a graded approach in applying safeguards requirements for all licensed facilities, depending on the strategic significance of the SNM authorized for possession, and the level and frequency of monitoring programs required for timely detection of losses. It is important to distinguish between the low strategic significance of low-enriched uranium (LEU) and the higher strategic significance of high-enriched uranium (HEU) and plutonium. LEU materials used to fabricate fuel assemblies for commercial power reactors are enriched to a level of one to 5 percent in the U-235 isotope. At this enrichment level, and under certain conditions, the uranium can sustain a chain reaction, but cannot generate a nuclear explosion regardless of its quantity and configuration.

NRC safeguards requirements covering LEU reflect its low strategic significance. They include a formal structured system for material control and accounting and graded physical protection measures. Because of the higher strategic significance of HEU and plutonium, which under certain circumstances could be used for the fabrication of a nuclear explosive device, the NRC requires HEU licensees to provide substantial physical protection of these materials including features such as barriers, intrusion alarms, armed guards, and offsite police response capability. Additionally, more rigorous controls and accounting programs are imposed, including intemal systems to control the movement of strategic SNM and to monitor its presence.

Licensees authorized to have significant quantities of strategic SNM (i.e., HEU, plutonium, or uranium-233), and facilities authorized to possess and use more than one effective kilogram of SNM of moderate strategic significance are required to conduct physical inventories at least every six months, whereas licensees whose holdings are restricted to SNM of low strategic significance perform physical inventories every twelve months.

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At each physical inventory, the quantity of SNM on hand, as physically determined, is compared to the quantity of SNM on hand as indicated by the facility's accounting records (or book inventory). The difference between the physical inventory and the book inventory is called l Inventory Difference (ID), also sometimes referred to as material unaccounted for (MUF).

ID values resulting from physical inventories conducted at facilities authorized to possess and ,

use significant quantities of strategic SNM are classified as " CONFIDENTIAL National Security Information" until at least six months have elapsed since the ID was derived, and any excessive ID has been investigated and resolved. For this reason, the ID data are not published until the ,

six months have elapsed.

Non-zero ids, both positive and negative, result from a combination of factors such as ,

measurement variability, measurement mistakes, changes in the quantity of unmeasured i

equipment holdup, and recordkeeping errors. An unmeasured loss, either accidental or 1

deliberate, or theft would cause a unidirectional impact on determining ID (e.g., mathematically increase a positive ID or decrease a negative ID). Generally, the more complex a facility's process operations are, especially when dealing with cliemhat operations, the greater the potential for uncertainty associated with an ID value. Although an ID larger than its overall measurement uncertainty may signal an abnormal situation, the fact that an ID falls within its associated limit of error, even a zero ID value, provides no automatic or conclusive proof that a loss or theft of SNM has not occurred. Therefore, the NRC relies on information provided not l only by the material accounting system, but also by the intemal control system, the physical l protection system, NRC inspections and evaluations, plus NRC and licensee investigations.

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Both the book inventory and the physical inventory are based on measured values, thus both are subject to measurement uncertainty. The total uncertainty associated with an ID value is designated by the standard error of the inventory difference (SEID), which is a 67 percent confidence level uncertainty, or by the limit of error of the inventory difference (LEID), which is a 95 percent confidence level uncertainty. Therefore, in the absence of recording errors, unmeasured losses, and material theft or diversion, the expected value of an ID is zero plus or minus SEID or LElD, depending on the desired confidence level.

The concept of LEID is a method that the NRC and licensees subject to 10 CFR 70.51 (Category li facilities) use to determine the significance of the ID. For those facilities, total measurement uncertainty associated with an ID (i.e. LEID) must not exceed 0.20 percent of the active inventory. Active inventory is the quantity of material measured for accountability j purposes since the last physical inventory, and for throughput- dominated facilities is essentially i equal to twice the throughput for the inventory period. In addition, an ID that exceeds its associated LElD may be an indication of processing problems, inaccurate measurements, bookkeeping errors, or a loss or theft of material. The NRC accordingly requires the licensees to take increasingly stronger investigative actions depending on how much the ID exceeds both LEID and quantities specified in 10 CFR 74.13(b).

The concept of SEID is a method that the NRC and licensees subject to either 10 CFR 74.31, 74.33, or 74.59 use to determine the significance of the ID. For 10 CFR 74.31 and 74.33 licensees (Category lil facilities), ID must exceed its threshold quantity, which represents a site-specific value that is considerably larger than SEID, before investigative actions are required.

I For 10 CFR 74.59 licensees (Category I facilities), investigative actions are required whenever an ID exceeds both specific quantities and three times SEID.

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3. CONCLUSION The ids for this reporting period (July 1,1996, through June 30,1997) are listed in the

" Tabulation of Inventory Differences" that begins on page 8 of this report. An explanation of the significance and, when appropriate, the contributing factor (s) for ids deemed excessive are included in the last column of the table. A total of 13 ID values were generated during this reporting period; 4 pertained to HEU, and 9 pertained to LEU materials. All of the ids were either within regulatory limits or expected ranges except one ID exceeded its regulatory limit.

The excessive ID was an ID gain resulting from all decommissioning and decontamination activities at the facility. This ID was investigated by the licensee and no anomalous conditions were identified.

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4. DEFINITION OF TERMS

1. Isotooe: A nuclide of a chemical element (such as uranium or plutonium) whose atoms all have the same number of protons characteristic of that element combined with different numbers of neutrons. That is, allisotopes 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. For example, U-235 and U-238 are two isotopes of uranium. Both contain 92 protons but have 143 and 146 neutrons, respectively, within the nucleus of each of their atoms.

2. Fissile isotoot: A nuclide species that is capable of giving rise to a self-sustaining chain reaction (of nuclear fission) when present in sufficient mass and concentration. U-233, U-235, Pu-239, and Pu-241 are the only fissile nuclides contained in "special nuclear material" (SNM), which also consists of other uranium and plutonium isotopes.

3. Source Material (SM): (1) Natural uranium or thorium, or depleted uranium, or any combination thereof, in any physical or chemical form, or (2) ores that contain by weight 0.05 percent or more of (i) uranium, (ii) thorium, or (iii) any combination thereof. SM does not include SNM.

4. Soecial Nuclear Material (SNM): (1) Plutonium, uranium-233, uranium enriched in the isotope uranium-235, and any other material that the U.S. Government, pursuant to the provisions of Section 51 of the Atomic Energy Act of 1954, as amended, determines to be SNM; or (2) any material artificially enriched in any of the foregoing. SNM (of any type) does not include SM.

5. Hioh-Enriched Uranium (HEU): Any uranium-bearing material whose uranium isotope content is 20 percent or more U-235 by weight (relative to total uranium element content).

6. Low-Enriched Uranium (LEU): Any uranium-bearing material whose uranium isotope content is less than 20 percent, but greater than 0.71 percent, U-235 by weight (relative to total uranium element content).

7. Natural Uranium: Any uranium-bearing material whose uranium isotopic distribution has not been altered from its naturally occurring state. Natural uranium is nominally 99.283 percent U-238,0.711 percent U-235, and 0.006 percent U-234.

8. Deoleted Uranium: Any uranium-bearing material whose combined U-233 plus U-235 isotopic content is less than 0.70 percent by weight (relative to total uranium element content).

9. Strategic Soecial Nuclear Material (SSNM): Uranium-235 contained in HEU, uranium-233, or plutonium.

NOTE: All SSNM is SNM, but not all SNM is SSNM.

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- 10. Effective Kilooram of SNM: -(1) For plutonium and U-233, their weight in kilograms; (2) I for uranium with an enrichment in the isotope U-235 of 1.00 percent (0.01 weight  ;

, fraction) and above, its element weight in kilograms multiplied by the square of its enrichment expressed as a decimal weight fraction; and (3) for uranium with an  ;

enrichment in U-235 below 1.00 percent, but above 0.71 percent, its element weight in kilograms multiplied by .0001, i

11. Formula Kiloaram (FKG): 1,000 formula grams of SSNM computed by the following l equation: i Grams = (grams U-235 contained in HEU) + 2.5 (grams U-233)

+ 2.5 (grams plutonium)

12. Formula Quantitv: SSNM in any combination in a quantity of 5,000 formula grams at mQra, as computed by the same equation as given above in definition No.11.

NOTE: In unirradiated form, this quantity of SSNM is sometimes referred to as a Category I quantity of material.

13. SNM of Moderate Strateaic Sionificance: (1) Less than a formula quantity of SSNM, but more than 1,000 grams of U-235 contained in HEU, or more than 500 grams of U-233 or plutonium, or more than a combined quantity of 1,000 formula grams when computed by the equation:

Grams = (grams U-235 in HEU) + 2.0 (grams U-233 + grams Fu) l or (2) 10,000 grams or more of U-235 contained in LEU enriched to 10 percent or more l (but less than 20 percent) in the U-235 isotope.

i. NOTE: In unirradiated form, either of the forementioned two quantities is sometimes referred to as a Category I! quantity.

14. SNM of Low Strateaic Sionificance: (1) Less than an amount of SNM of moderate strategi.c significance, but more than 15 grams of (i) U-235 contained in HEU, (ii) U-233, ,

(iii) plutonium, or (iv) any combination thereof; (2) less than 10,000 grams, but more than 1,000 grams of U-235 contained in LEU enriched to 10 percent or more (but less than 20 percent) in the U-235 isotope; or (3) 10,000 grams or more of U-235 contained in LEU enriched above natural, but less than 10 percent, in the U-235 isotope.

NOTE: In unirradiated form, any of the above three quantities is sometimes referred to as a Category ill quantity.

15. jnventorv Difference flD): The arithmetic difference between a book inventory and the corresponding physical inventory, calculated by subtracting ending inventory (EI) from the combination of beginning inventory (BI) plus additions to inventory (A) minus removals from inventory (R). Mathematically, this can be expressed as:

ID = (BI + A - R)- El or ID = BI + A- R - El 5 NUREG-0430, Volume 17

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

17. Standard Error of the ID (SEID):

(a) For Category til licensees subject to 10 CFR 74.31 or 74.33, SEID is equal to the square root of the sum of both measurement and non-measurement variances associated with an ID.

(b) For Category I licensees subject to 10 CFR 74.59, SEID is equal to the square root of the measurement variance (only) associated with an ID.

18. Petection Quantity (DQ): A site-specific SNM quantity for Category lli licensees whose processing activities are limited to SNM of low strategic significance. The DQ is normally a function of annual throughput, but for low-throughput LEU facilities, the DQ need not be less than 25 kilograms of U-235. The DQ can also be described as a goal quantity, the loss or theft of which must be detected with a 90 percent or better probability, whenever a physical inventory is taken.

19. Detection Threshold (DT): An ID alarm limit for Category ill licensees that will be exceeded (with 90 percent or higher probability) by an ID (resulting from the taking of a physicalinventory) whenever there has been an actualloss of a detection quantity. The DT is a function of both the DQ and SEID, as shown in the following equation:

DT = DQ - 1.3 (SEID)

20. The ID Was Within its Exoected Ranae: The ID was less than (i) 200 grams plutonium or U-233, (ii) 300 grams U-235 contained in HEU, or (iii) 9,000 grams U-235 contained in LEU, as appropriate, and/or was less than its associated LEID.

21. The ID Was Within its Reoulatorv Limit: The ID exceeded both (1) 200 grams U-233 or plutonium,300 grams U-235 contained in HEU, or 9,000 grams U-235 contained in LEU (as appropriate), and (2) its associated LElD or SEID, but was less than 1.5 times the limit for LEID (for 10 CFR 70.51 licensees) or less than the ID limit (for 10 CFR 74.31 and 74.59 licensees). For 10 CFR 74.31 licensees, the ID limit is the site-specific detection threshold quantity, which is considerably larger than SEID. For 10 CFR 74.59 licensees, the ID limit is 3 times SEID.

22. The ID Exceeded its Reaulatorv Limit: The ID exceeded its applicable regulatory limit and was thus subject to both licensee and NRC investigations to determine the cause(s) of the excessive value (regardless of whether the ID was negative or positive).

23. Neoative ID: A situation that occurs when the amount of SNM on hand, as determined by the physical inventory, exceeds the amount of SNM being carried on the books (records). That is, there appears to be a gain in material. Mathematically, a negative ID is written as "-ID," or shown in parentheses. A negative ID is also referred to as an "lD gain."

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24. Positive ID: A situation that occurs when the amount of SNM on hand, as determined by the physical inventory, is less than the amount of SNM being carried on the books (records). That is, there appears to be a loss of material. Mathematically, a positive ID is written as "+1D," or is shown without any designation of sign. A positive ID is also referred to as an "lD loss."

25. Elant: For SNM control and accounting purposes, a plant is defined as a set of processes or operations (on the same site, but not necessarily all in the same building) coordinated into a single manufacturing, R&D, or testing effort. Most licensees have only one plant in this context. A scrap recovery operation serving both onsite and offsite customers, or more than one onsite manufacturing effort (plant), would be treated as a separate plant.

26. SNM Material Tvoe Cateoories: For inventory and accounting purposes, SNM is classified into six material type categories (not to be confused with Categories I, ll, and 111 quantities). The six categories are uranium in cascades, LEU, HEU, uranium-233, plutonium, and plutonium-238. For each category, SNM is accounted for on both a total element and isotope basis. The element and isotope for each category are as follows:

CATEGORY ELEMENT ISOTOPE Uranium in Cascades Total Uranium U-235 LEU Total Uranium U-235 HEU Total Uranium U-235 Uranium-233 Total Uranium U-233 Plutonium Total Plutonium Pu-239 + Pu-241 Plutonium-238 Total Plutonium Pu-238

27. Active Inventorv (AI): The sum of beginning inventory (BI), additions to inventory (A),

removals from inventory (R), and ending inventory (EI), after all common terms have been totally excluded. A common term is any nuclear material value (or item) that appears in both BI and El, or both BI and R, or both A and R, or both A and Ei, with both values derived from the same measurement (or combination of measurements), and thus does not c7ntribute to the uncertainty associated with the current period inventory difference. The active inventory is used as an indicator of processing throughput and/or measurement activity.

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5. TABULATION OF INVENTORY DIFFERENCFJ Inventory Docket SNM Inventory Difference Explanation SNM [See definitions #20,21, & 22]

License No. No. Category Date (Grams U-235)

Licensee 42 70-27 HEU 09/30/96 - 1,667 The ID was within its BWX Technologies, Inc. regulatory limit.

(formely Babcock & Wilcox)

Naval Nuclear Fuel Division + 647 The ID was within its HEU 03/31/97 Lynchburg, Virginia regulatory limit.

LEU 09/30/96 + 495 The ID was within its expected range.

LEU 03/31/97 + 8,518 The ID was within its expected range.

1168 70-1201 LEU 04/14/97 + 924 The ID was within its Framatome-Cogema Fuels expected range.

(formely B&W Fuel Company) i Lynchburg, Virginia  !

i 70-36 LEU 08/01/97 - 2,956 The ID was within its Combustion Engineering 33 expected range.

Hematite, Missouri l

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5.' TABULATION OF INVENTORY DIFFERENCES (CONTINUED)

Inventory SNM Docket SNM Inventory Difference Explanation Licensee License No. No. Category Date (Grams U-235) [See definitions #20,21, & 22]

Genem! Atomics 696 70-734 HEU 07/15/90 <1 The ID was within its San Diego, Califomia expected range.

t LEU 07/15/96 <1 The ID was within its expected range.

General Electric Company 1097 70-1113 LEU 09/08/96 - 14,749 The ID was within its Wilmington, North Carolina regulatory limit.

Nuclear Fuel Services 124 70-143 HEU 05/02/97 - 706 The ID was within its Erwin, Tennessee regulatory limit.

i LEU 06/27/97 - 26,383 The ID exceeded its regulatory limit of 3 times SEID. The ID was investigated by the licensee  ;

and no anomalous conditions were identified. The ID gain resulted from decommissioning activities.

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5. TABULATION OF INVENTORY DlFFERENCES (CONTINUED)

Inventory SNM Docket SNM Inventory Difference Explanation Licensee License No. No. Category Date (Grams U-235) (See definitions #20,21, & 22]

Siemens Nuclear Power Corp. 1227 70-1257 LEU 03/18/97 + 55 The ID was within its Richland, Washington expected range.

Westinghouse Electric Corp. 1107 70-1151 LEU 03/31/97 - 14,041 The ID was within its l Columbia, South Carolina regulatory limit.

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NRC FORM 335 U.S. NUCLEAR REGULATORY COMMISslON 1. REPORT NUMBER G49)

EE BIBLIOGRAPHIC DATA SHEET (Ass @ned by NRC, Add Vol, Supp, Rev, (sa mestmas on me rewrse'

2. T6TLE AND SUBTITLE NUREG-0430 Volume 17 Licensed Fuel Facility Status Report Inventory Difference Data 3. DATE REPORT PUBUSHED July 01,1996-June 30,1997 MoNN mR l

November 1998

4. FIN OR GRANT NUMBER 1

5. AUTHOR (S)

6. TYPE OF REPORT Thomas N Pham Status Summary Report

7. PERIOD COVERED (mdussve ostes)

July 1996-June 1997

8. PERFORMING ORGANIZATION - NAME AND ADDRESS (#NRc, provide DMacn. Omce or Region, u.s. Nudeer Reguratory commrsson. and maAng adoress; aconersdor prowce name and mahng assest)

Office of Nuclear Material Safety and Safeguards U.S. Nuclear Regulatory Commission Washington, DC 205554001

9. andmaeng SPONSORING adsess)ORGANIZATION - NAME AND ADDRESS (#NRC tse Tiamo as atmet #wneractor, powde NRcawsen, orres or Regon. u.s. NudeerRegumory conmsson, Same as 8, above

10. SUPPLEMENTARY NOTES

11. ABSTRACT (200 monts or hu)

NRC is committed to the periodic publication of licensed fuel cycle facility 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 special nuclear material.

12. KEY WORDS/DESCRIPTORS (ust words or parases mat war assist resesreriers e besong ene report; 13. AvAus LrrY STATEMENT nuclear fuel facilities, inventory difference, physical inventories, special nuclear material accounting ar.s -,

unclassified (Thus Report) unclassified

15. NUMBER OF PAGES 16 PRICE NRC FORM 335 Q49)

N has manicany prodd by be Federal Fm inc.

l Printed on recycled Paper Federal Recycling Program

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l i UNITED STATES FIF.ST CLASS MAIL NUCLEAR REGULATORY COMMISSION y - - - - . POSTAGE AND FEES PAID WASHINGTON, DC 20555-0001 USNRC 0s kkfdhc",jg6 I I2Nyyy PERMIT NO. G47 OIV-INFOR4ATION T P S - p '3 4 -N UR E r, OFFICIAL BUSINESS H#N4GEMEN7 PENALTY FOR PRIVATE USE, $300 2WFN-6E7 WASHINGT0N DC 20555 e

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