ML20072C907
| ML20072C907 | |
| Person / Time | |
|---|---|
| Issue date: | 02/28/1983 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| NUREG-0430, NUREG-0430-V03-N01, NUREG-430, NUREG-430-V3-N1, NUDOCS 8303100427 | |
| Download: ML20072C907 (14) | |
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NUREG 0430 Vol. 3, No.1 l
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l LICENSED FUEL FACILITY STATUS REPORT l
l INVENTORY DIFFERENCE DATA JANUARY 1982 - JUNE 1982
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i UNITED STATES NUCLEAR REGULATORY COMMISSION
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Available from NRC/GPO Sales Program Superintendent of Documents
' Government Printing Office Washington, D. C. 20402 A year's subscription consists of - 2 issues for this publication.
Single copies of this publication are available from National Technical information Service, Springfield, VA 22161 -
Microfiche of single copies are -
available from NRC/GPO Sales Program Wasinngton, D, C. 20555 -
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NUREG-0430 Vol. 3, No.1 5.
LICENSED FUEL FACILITY STATUS REPORT INVENTORY DIFFERENCE DATA JANUARY 1982 - JUNE 1982 Manuscript Completed: January 1983 Date Publishei February 1983 OFFICE OF INSPECTION AND ENFORCEMENT U.S. NUCLEAR REGULATORY COMMIS$10N CASHINGTON, D.C. 20555 b
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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 uranium, plutonium, or uranium-233.
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Abstract..'.................
111 Abb re v i a t i o n s................,...'.....................................
vii I nventory Di f fe rence Da ta...........................................'
1 Definitions of Terms................................................
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Tabul ation of Inventory Di fferences..................................
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l ABBREVIATIONS CFR Code of Federal Regulations HEU High Enriched Uranium ID
_ Inventory Difference LEID Limit of Error of the Inventory Difference LEMUF Limit of Error of Material Unaccounted For LEU Low Enriched Uranium MUF Material Unaccounted For NRC U.S. Nuclear Regulatory Commission
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SNM Special Nuclear Material S-R Shipper-Receiver l
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LICENSED FUEL FACILITY STATUS REPORT 1
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 naterial 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 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 uranium-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 possesting significant quantities of high enriched uranium, plutonium, or uranium-233 to conduct an inventory every 2 months. Licensees possessing one j
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 comercial i
light-water power reactors) is enriched to a level of 1 to 4 percent in the i
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 j
explosion.
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NRC safeguards requirements covering low enriched uranium are graded to reflect its low strategic value. They include a formal structured system for material I
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 required by NRC.
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Inventory differences arise when nuclear materials are processed (particularly
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when chemical operations 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 inventory difference larger than its overall l
measurement uncertainty (limit of error) may signal an abnonnal situation l
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Y 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 physical security' system, NRC inspections and evaluations, and NRC and licensee investigations.
A method that licensees 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 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 indication of processing problems, biased or otherwise inaccurate measurements, bookkeeping errors, or loss or theft of material, NRC accordirgly 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 (January 1,1982 through June 30, 1982).
In both cases that the inventory difference exceeded the criteria of 10 CFR 70.53(b)(1), the licensee forwarded 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.
In certain instances in the past, NRC has independently conducted investigations of an excessive ID.
These investigations have not established that significant quaatities of special nuclear material have been stolen.
For each ir.ventory 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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Definitions of Terms 1.
Effective Kilogram of S)ecial Fuclear Material: (1) For plutonium and uranium-233, their weig1t 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 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 (1%), its element weight in kilograms multiplied by 0.0001.
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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).
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Isotope: One of two or more atoms with the same number of protons, but different numbers of neutrons in their nuclei.
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Limit 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 falls within the applicable regulatory limit":
The ID does not exceed both a minimum quantity specified by the Consnission and either the associated limit of error of the inventory difference (LEID) or some other limit granted by the Cormission.
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Uranium whose isotope content is less than 20 percent uranium-235 by weTght.
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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 an an "ID gain."
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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 to as an "ID loss".
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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, j
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Special nuclear material (SNM):
(1) Plutonium, uranium enriched in the isotope 233 or in the isotcpe 235, and any other material that the Comission, 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 includa source material; or (2) any material artificially enriched in any of the foregoing, but does not include source material.
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Strategic special nuclear material: Uranium-235 (contained in uranium i
enriched to 20 percent or more in the U-235 isotope), uranium-233, or plutonium.
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i Tabulation of Inventory Differences Inventory Difference Icensee Material Inventory (Grams of s
Licensee No. $NM-Type Date U-235)
Explanation Babcock & Wilcox 42 HEU 02/28/82 521
.The inventory difference falls within Navy, Lynchburg, VA the aDplicable regulatory limit.
HEU 04/30/82 307 The inventory difference falls within
'the applicable regulatory limit.
HEU 06/30/82 1,980 The inventory difference is the result of shipper-receiver differences and an accounting error identified after the inventory had been completed.
Babcock & L'ilcox 145 LEU 06/25/82
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.The inventory difference falls within Apollo, PA the-applicable regulatory limit.
Babcock & Wilcox 778 LEU 04/30/82 The inventory difference falls within Lynchburg Research the applicable regulatory limit.
Center, VA Babcock & Wilcox 1168 LEU 01/04/82
-3,550 The inventory difference falls within CNFP, Lynchburg, VA the applicable regulatory limit.
LU 06/28/82
-864 The inventory' difference falls within the applicable regulatory limit.
Combustion Engineer-33 LEU 66/28/82
-2,413 The inventory difference falls within ing, Hematite, M0 the applicable regulatcry limit.
Combustion Engineer-1067 LEU 04/26/82 3,665 The inventory difference falls within ing, Windsor, CN
-the applicable regulatory limit.
Exxon, Richland, WA 1227 LEU 04/15/82
-2,608 The inventory difference falls within the applicable regulatory limit.
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Inventory Difference Licensee Material Inventory (Grams of x
Licensee No. SNM-Type Date U-2 6)
Exnlanation General Atomic, 696 HEU 01/18/82
-210 The inventory dif ference falls within La Jolla, CA the applicable regulatory limit.
HEU 03/15/82
-54 The inventory difference falls within the applicable regulatory limit.
HEU 05/17/82
-206 The inventory difference falls within the applicable regulatory limit.
LEU 03/15/82
-?7 The inventory difference falls within the applicable regulatory limit.
General Electric, 1097 No inventory was conducted during this Wilmington, NC period.
Nuclear Fuel 124 LEU 06/16i82
-2,508 The inventory difference falls within Services, Erwin, TN the applicable regulatory limit.
HEU 02/03/82 632 The inventory difference falls within-the applicable regulatory limit.
HEU 04/07/82
-271 The inventory difference falls within the applicable regulatory limit.
HEU 06/09/82 3310 The inventory difference falls within the applicable regulatory limit.
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Licensee Material Inventory (Grams of Licensee No. SNM-Type Date U-235)
Explanation aI E
Rockwell, ESG 21 HEU 01/04/82 70 The inventory difference falls within 3
Canoga Park, CA the applicable regulatory limit.
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HEU 03/01/82 247 The inventory difference falls within a
the applicable regulatory limit.
9 HEU 05/03/82
-61 The inventory difference falls within the applicable regulatory limit.
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Union Carbide, 639 HEU 03/01/82
-164 The inventory difference falls within I
Tuxedo, NY the applicable regulatory limit.
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E HEU 04/27/82
-130 The inventory difference falls within the applicable regulatory limit.
u HEU 06/23/82
-64 The inventory difference falls within the applicable regulatory limit.
United Nuclear "orp.
368 HEU 01/22/82
-163 The inventory difference falls within Montville, CT the applicable regulatory limit.
HEU 03/26/82
-286 The inventory difference falls within the applicable regulatory limit.
HEU 05/21/82 159 The inventory difference falls within the applicable regulatory limit.
Westinghouse, 1107 LEU 05/02/82
-16,210 The inventory difference exceeded the Columbia, SC LEID. The inventory difference is attributed to material recovered during the removal and decontamination of obsolete production equipment.
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- u s. NmLa An RsGut Atony commission SIBLIOGRAPHIC DATA SHEET NUREG-0430, Vol. 3. No.1 G TITLE AND SU8T1TLE Mdd Vo@me Na, af asserensel
- 2. (Leere 6/m*/
Licensed Fuel Facility Status Report Inventory Difference Data
- 3. RECIPIENT S ACCESSION NO.
January 1982-June 1982 7 AUTHORtS)
- 5. DATE REPORT COMPLETED woNTH l YEAR Ja nuary 1983
- 0. PE RFORMING ORGA.882ATION NAME AND MAILING ADORESS (/actue lip Codel DATE REPORT (SSUED ANTH lVEAR U.S. Nuclear Regulatory Commission February 19R'1 Office of Inspection and Enforcement s (te=,um*i Washington, D.C. 20555
- 8. (Leave omkl 12 SPONSOHING ORGANI2ATION NAME AND MAILING ADORESS (include tra Codel
- 10. PROJECT / TASK / WORK UNIT NO.
- 11. CONTRACT NO.
13 TYPE OF REPORT PE RIOD COVE RE D (inclusive dates)
Status Summary Report January 1, 1982 - June 30, 1982*
1$ SUPPLEMENTARY NOTES 14 (Le-e c'e A t 16 AUSTRACT 000 worris or less/
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 uranium, plutonium or uranium-233.
I7 AE Y WORDS AND DOCUMENT ANALYSIS 17a DESCRIPTOR$
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