ML20066B478
| ML20066B478 | |
| Person / Time | |
|---|---|
| Issue date: | 10/31/1982 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| NUREG-0430, NUREG-0430-V02-N02, NUREG-430, NUREG-430-V2-N2, NUDOCS 8211080008 | |
| Download: ML20066B478 (15) | |
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NUREG-0430 Vol. 2, No. 2 LICENSED FUEL FACILITY STATUS REPORT f
INVENTORY DIFFERENCE DATA JULY 1981 - DECEMBER 1981 UNITED STATES NUCLEAR REGULATORY COMMISSION l
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Available from NRC/GPO Sales Program Superintendent of Documents Government Printing Office Washington, D. C. 20407 i
A year's subscription consists of 2 issues for this publication.
Single copies of this publication are available from National Technical I
information Service, Springfield, VA 22161 Microfiche of single copies are available from NRC/GPO Sales Program Washington, D. C. 20555 l
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NUREG 0430 Vol. 2, No. 2 LICENSED FUEL FACILITY STATUS REPORT INVENTORY DIFFERENCE DATA i
JULY 1981 - DECEMBER 1981 t
Date Pu ish d ctober 19 2 81To A?nal&"#s"#Jn"'
WASHINGTON, D.C. 20555 p'"%
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ABSTRACT NRC is comitted to the periodic publication of licensed fuel facilities inventory difference data, following agency review of the infornation 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 uranium, plutonium, or uranium-233.
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CONTENTS Abstract..................................../...'.....................
iii Abbreviations........................................................
vii Invento ry Di f fe rence Da ta...........................................
1 Definitions of Terms................................................
3 Tabulation of Inventory Differences.................................. 5 l
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l ABBREVIATIONS
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CFR Code of Federal Regulations HEU High Enriched Uranium ID Inventory Difference LEID Limit of Error of the Inventory Difference i
LEMUF Limit of Error of Material Unaccounted For LEU Low Enriched Uranium MUF Material Unaccounted For NRC U.S. Nuclear Regulatory Commission SNM Special Nuclear Material S-R Shipper-Receiver
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1 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 that i
a licensee's accounting records show should be on hand and that which a licensee's physical inventory shows is actually on hand.
The inventory difference 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, plutonium, and uranNm-233) or at least one effective kilogram of low enriched uranium (for example, material used in comercial nuclear power reactors). The U. S. Nuclear Regulatory Commission (NRC) requires licensees possessing significant quantities of high enriched uranium, plutonium, or uranium-233 to conduct an inventory every 2 months. Licensees possessing one effective kilogram of low enriched uranium are required to inventory every 6 months, except for General Electric Co., Wilmington, N.C., which is required to inventory every 12 months.
It is important to understand the distinction between the low strategic value of low enriched uranium and the higher strategic value of high enriched uranium and plutonium. Most low enriched uranium (the nuclear fuel for commercial I
light-water power reactors) 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 low enriched uranium are graded to reflect l
its low strategic value. They include a formal structured system for material
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control and accounting and, in accordance with recent revisions to 10 CFR 73, minimal physical security measures. On the other hand, because of the higher strategic importance of significant quantities of high enriched uranium 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 movement of this nuclear material are also g
required by NRC.
Inventory differences arise when nuclear materials are processed (particularly when chemical operations are involved). These differences can result from i
variations in measuring and processing, measurement inaccuracy or imprecision, unmeasured flows from the process, unmeasured inventory, bookkeeping errors, or loss or theft. Although an inventory difference larger than its overall measurement uncertainty (limit of error) may signal an abnormal situation 1
i requiring determination of cause, the fact that an inventory difference falls within its associated limit of error--even an inventory difference of zero--provides no automatic or conclusive proof that loss or theft of material has not occurred.Therefore NRC relies on information provided not only by the material accounting system but also by the internal control system, the
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physical security system, NRC inspections and evaluations, and NRC and licensee I
investigations.
A method that licenseer and NRC currently use to determine the signifance of the inventory difference is a concept called LEID, or limit of error of the inventory difference.
LEID is a calculated estimate of the measurement I
uncertainties that are associated with a plant's processing activity. The inventory difference theoretically should be less than LEID 19 out of 20 times, if the inventory difference results only from measurement uncertainty.
Because an inventory difference that exceeds its associated LEID may be an i
indication of processing problems, biased or othemise inaccurate measurements, bookkeeping errors, or loss or theft of material, NRC accordingly requires licensees to take increasingly stronger investigative actions depending on how much the inventory difference exceeds LEID.
Two inventory differences exceeded their LEID during the period of this report (July 1,1981. through December 31,1981).
In both cases that the inventory difference exceeded the criteria of 10 CFR 70.53(b)(1), the licensee fomarded to NRC a statement of the probable reasons for the ID and the actions taken or planned with respect to the ID. Each such statement has been reviewed by NRC.
Inventory data for
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Rockwell were inadvertently'omitted from the last volume. The inventory data for January 1,1981 through June 30, 1981, are included in this volume.
In certain instances in the past, NRC has independently conducted investigations of an excessive ID. These investigations have not established that signifi-cant quantities of special nuclear material have been stolen.
For each inven-i tory difference noted in this report, there is an evaluation of the data and, where appropriate, the cause or causes of the inventory difference have been identified.
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I Definitions of Terms 1.
Effective Kilogram of Special Nuclear Material: (1) For plutonium and J
uranium-233, their weight in kilograms; (Z) for uranium with an enrichment in the isotope uranium-235 of 0.01 (1%) 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 the isotope uranium-235 below 0.01 (15), its element weight in kilograms multiplied by 0.0001.
2.
High Enriched Uranium (HEU): Uranium whose isotope content is 20 percent or more uranium-235 by weight.
3.
Inventory Difference (ID): The arithmetic difference between a book inventory and the corresponding physical inventory, calculated by subtrac-ting ending inventory (EI) plus removals (R) from beginning inventory (BI)plusadditions(A). Mathematically, this becomes ID = (BI + A) - (EI + R).
4.
Isotope: One of several different atoms of a particular element, that has the same number of protons in its nuclei, has the same atomic number, but differs in the number of neutrons and in the mass number.
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j imit of Error: The uncertainty component used in constructing a 95 percent confidence interval associated with a quantity after any recognized bias has been eliminated or'its effect accounted for.
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Limit of Error of the Inventory Difference (LEID):.That limit of error associated with the inventory difference after the material balance data has been adjusted for any recognized bias (same as limit of error of material unaccounted for [LEMUF]).
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"The inventory difference is within the regulatory limit": The ID does f
not exceed both a minimum quantity specified by the regulations and its associated limit of error of the inventory difference (LEID).
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Low Enriched Uranium (LEU?: Uranium whose isotope content is less than 20 percent uranium-235 by we' ght.
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Negative Inventory Difference: A situation that occurs when the amount of material on hand, as deterdined 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.
A negative ID is also referred to an an "ID gain."
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- 10. Positive inventory difference: A situation that occurs when the amount if 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".
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- 11. 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.
- 12. Special nuclear material (SNM):
(1) Plutonium, uranium-233, uranium enriched in the isotope 233 or in the isotope 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.
- 13. Strategic special nuclear material: Uranium-235 (contained in uranium enriched to 20 percent or more in the U-235 isotope), uranium-233, or plutonium, i
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Trbuletien of Inv:ntary Differ:nces Inventory Difference License Material Inventory (Grams Licensee No.
Type Date U-235)
Explanation Babcock & Wilcox SNM-42 HEU 08/31/81 1,906 The inventory difference falls witF.in Navy, Lynchburg, VA the applicable regulatory limit.
HEU 10/31/81 915 The inventory difference falls within the applicable re0ulatory limit.
1 HEU 12/31/81
-378 The inventory difference falls within l
the applicable regulatory limit.
Babcock & Wilcox SNM-145 LEU 12/29/81
-700 The inventory difference falls within Apollo, PA the applicable regulatory limit.
Babcock & Wilcox SNM-778 LEU 10/31/81 139 The inventory difference falls within u,
Lynchburg Research the applicable regulatory limit.
Center, VA Babcock & Wilcox, SNM-1168 LEU 07/01/81
-5,769 The inventory difference falls within CNFP, Lynchburg, VA the applicable regulatory limit.
Combustion Engineer-SNM-33 LEU 07/20/81
-624 The inventory difference falls within ing, Hematite, M0 the applicable regulatory limit.
Combustion Engineer-SNM-1067 LEU 10/29/81 6,162 The inventory difference falls within ing, Windsor, CN the applicable regulatory limit.
Exxon, Richland, WA SNM-1227 LEU 09/30/81
-414 The inventory difference falls within the applicable regulatory limit.
l Inventery Difference License Material Inventory (Grams Licensee No.
Type Date U-235)
Explanation General Atomic, SNM-696 LEU 09/21/81 216 The inventory difference falls within LaJolla, CA the applicable regulatory limit.
HEU 07/20/81
-1,762 The inventory difference is due to the recovery of material during the disassembly and cleanup of a facility ventilating system.
HEU 09/21/81
-1,528 The inventory difference is partially due to an enrichment change from the blending of enriched operating material from an incinerator.
HEU 11/16/81
-365 The inventory difference falls within the applicable regulatory limit.
General Electric, SNM-1097 LEU 08/10/81 6,940 The inventory difference falls within the applicable regulatory limit.
Wilmington, NC Nuclear Fuel SNM-124 LEU 11/18/81
-5,556 The inventory difference falls within Services, Erwin, TN the applicable regulatory. limit.
HEU 07/29/81 5,688 The inventory difference falls within
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the applicable regulatory limit.
HEU 09/30/81
-760 The inventory difference falls within the applicable regulatory limit.
HEU 12/02/81
-2,393 The inventory difference falls within i
the applicable regulatory limit.
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Inventory Difference License Material Inventory (Grams Licensee No.
Type Date U-235)
Explanation
-270 The inventory difference falls within Canoga Park, CA the applicable regulatory limit.
HEU 03/02/81 207 The inventory difference falls within the applicable regulatory limit.
HEU 05/04/81 72 The inventory difference falls within l
the applicable regulatory limit.
l HEU 06/29/81
-135 The inventory difference falls within the applicable regulatory limit.
HEU 08/31/81 148 The inventory difference falls within the applicable regulatory limit.
HEU 11/03/81
-146 The inventory difference falls within the applicable regulatory limit.
u Texas Instruments, SNM-23 HEU 08/25/81 2
The inventory difference falls within Attleboro, MA the applicable regulatory limit.
l HEU 10/28/81
-6 The inventory difference falls within the applicable regulatory limit.
HEU 12/16/81 0
The inventory difference falls within the applicable regulatory limit.
Union Carbide, SNM-639 HEU 07/01/81
-139 The inventory difference falls within Tuxedo, NY the applicable regulatory limit.
HEU 08/31/81
-40 The inventory difference falls within the applicable regulatory limit.
HEU 10/28/81
-58 The inventory difference falls within the applicable regulatory limit.
HEU 12/30/81
-123 The inventory difference falls within the applicable regulatory limit.
Inventory Difference License Material Inventory (Grams Licensee No.
Type Date U-235)
Explanation United Nuclear Corp.
-113 The inventory difference falls within Montville, CT the applicable regulatory limit.
HEU 09/18/81
-188 The inventory difference falls within the applicable regulatory limit.
HEU 11/20/81 541 The inventory difference falls within the applicable regulatory limit.
Westinghouse, SNM-1107 LEU 11/01/81 4,387 The inventory difference falls within Columbia, SC the applicable regulatory limit.
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U.s. NUCLEAM REGULATORY COMMISSION
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BIBLIOGRAPHIC DATA SHEET Vol. 2 No. 2 4 TITLE AND SU5 TITLE (Add Vodume Na,,f appreneel
- 2. (Leere alm 41 Licensed Fuel Facility Status Report
- 3. RECIPIENT'S ACCESSION NO.
Inventory Difference Data July 1991 - December 1981
- 7. AUTHOR (S)
S. DATE REPORT COMPLETED
%IEember.
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- 9. PERFORMING ORGANIZATION N AMF AND MAILING ADDRESS (lacrude lip CodeJ DATE REPORT ISSUED U.S. Nuclear Regulatory Connission "8c't'o"be r I "N82 Office of Inspection and Enforcement
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Washington, D.C.
20555 S. (Leave Nank)
- 13. SPONSORING ORGANIZATION NAME AND MAILING ADDRESS (include 2,p Coar) 0
- 11. CONTRACT NO.
- 13. TYPE OF REPORT PE RIOD COVE RED (Inclusive deses)
Status Sumary Report July 1.1992 - Deepmher 31 1d41
- 14. ILeave ofma) 15 SUPPLEMENTARY NOTES
- 16. ABSTR ACT d200 words or dessJ 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 included 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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- 17. KEY WORDS AND DOCUMENT ANALYSIS 17a DESCRIPTOHS 17o IDENTIFIERS /OPEN ENDED TERMS 19 SECURITY CLASS (This recorrJ 21 NO. OF PAGES 18 AV AILABILITY STATEMENT Uncl assi fi nd
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