ML20087J403
| ML20087J403 | |
| Person / Time | |
|---|---|
| Issue date: | 03/31/1984 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| NUREG-0430, NUREG-0430-V04-N01, NUREG-430, NUREG-430-V4-N1, NUDOCS 8403220189 | |
| Download: ML20087J403 (14) | |
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l NUREG 0430 Vol. 4, No.1 LICENSED FUEL FACILITY STATUS REPORT INVENTORY DIFFERENCE DATA JANUARY 1983 - JUNE 1983 UNITED STATES NL' CLEAR REGULATOP.Y COMMISSION g="c oy,?,
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s 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 N RC/GPO Sales Program Washington, D. C. 20555 l
l NUREG-0430 l
Vol. 4, No.1 l
LICENSED FUEL FACILITY STATUS REPORT f
I INVENTORY DIFFERENCE DATA JANUARY 1983 - JUNE 1983 Manuscript Completed: January 1984 Date Published: March 1984 OFFICE OF INSPECTION AND ENFORCEMENT U.S. NUCL'AR REGULATORY COMMISSION WASHINGTON, D.C. 20555
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ABSTRACT NRC is corrnitted 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 kilogran of high enriched uranium, low enriched uraniun, plutonium, or uranium-?33.
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CONTENTS l
Page Abstract.............................................................
iii Abbreviations......................
vii I nv e n to ry Di f fe re nce Da ta...........................................
1 Definitions of Terms................................................
3 Tabulation of Inventory Differences..................................
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ABBREVIATIONS 1
l CFR Code of Federal Regulations HEU high enriched uranium ID inventory difference LE1D limit of error of the inventory difference LEU low enriched uranium MUF material unaccounted for NRC U.S. Nuclear Regulatory Commission I
SNt1 special nuclear material S-R shipper-receiver
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LICEllSED FUEL FACILITY STATilS REPORT INVEilTORY DIFFEREt!CE DATA Inventory Difference Data An inventory difference (ID), also referred to as material unaccounted for (fiUF), is the difference between the quantity of special nuclear material (SNid that a licensee's accounting records show should be on hand and that which r
a licensee's physical inventory shows is actually on hand.
The inventory dif ference 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-??') or at least one effective kilogram of low enriched uranium (for.
exanple, the nuclear fuel used in commercial light-water nuclear power reactors).
The U.S. Nuclear Regulatory Commission (NRC) requires licensees possessing signif-icant 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 inv'ntcry every 6 months, except for General Electric Co., llilmington, NC, which is required to inventory every 17 months.
1 It is important to understand the distinction between the low strategic value of low enriched uranium (LEU) and the higher strategic value of high enriched uranium (HEU) and plutonium.
Most low enriched uranium (the nuclear fuel fo'.'
commercial light-water power reactors) is enriched to a level of-1 to 4 percent in the isotope uraniun-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 its low strategic value. They include a formal structured system for material control and accounting and minimal physical security measures. On the other hand, because of the higher strategic importance of significant ouantities of high enriched uranium and plutonium, NRC requires licensees to provide substantial physical protection of this material in addition to controlling and accountine for it. Physical protection of this ceterial includes safeguards measures such as barriers, intrusion alerms, armed guards, and offsite police response capa-bilities. Internal systens to control the novement of this nuclear material are also required by fiRC.
Inventory differences arise when nuclear materials are processed (particularly when chemical operations are involved).
These differences can result from variations in neasuring and processing, reasurenent inaccuracy er imprecision, unneasured' flows from the process, unneasurrd inventory, bookkeeping errors, 1-or loss or thef t.
Althcroh an inventory difference _ larger than its overall neasurement uncertainty (limit of error of the inventory difference - LEID)
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may signal an abnormal situation requiring determination of cause, the fact that an inventory difference falls within its associated limit of error--even i
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 currer.tly use to determine the significance 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.
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inventory difference theoretically should be less than LEID 19 out of 20 times, if the inventory difference results only from measurement uncertainty.
1 Because an inventory differenc'e that exceeds its associated LEID may be an indi-cation of processing problems, biased or otherwise inaccurate measurements, book'-
keeping errors, or loss or theft of material, NRC accordingly requires licen-sees to take increasingly stronger investigative actions depending on how much the inventory difference exceeds LEID.
One, inventory difference exceeded its LEID during the period of this report (January 1,1983 through June 30,1983).
In this case where the inventorv difference exceeded the criteria of 10 CFR 70.53(h)(1), the licensee forwa'rded to NRC a statement of the probable. reasons for the ID and the actions taken and planned with respect to the ID.
The state-ment has been reviewed by NRC. In certain instances in the past, NRC has independ-ently conducted investigatfors of an excessive ID.
These investigations have not established that significant ouantities of special nuclear material have been stolen.
For each inventory difference noted in this report, there is an evaluation of the data and, where appropriate, the cause or causes o' the inventory dif#erence have been identified. In the last issue of this report (NUREG-0430, Vol. 3, No. 2) the inventory difference for HEU inventories of 8/11/82,10/13/8?, and I?/15/82 at i
huclear Fuel Services at Erwin, TN were inadvertently printed as -398, 4,189, and I
3,106 grams instead of 1,115, -3,688, and 1,805 grams, respectively.
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Definitions of Terms 1.
Source material:
(1) Uranium or thoriun, or any combination thereof, in any physical or chemical form or (2) ores which contain by(weight one-twentieth of one percent (0.057) or more of: (i) Uranium, ii) thorium, or (iii) any combination thereof.
Source material does not include special nuclear material.
2.
Special nuclear material (SNM):
(1) Plutonium, uranium-233, uranium enriched in the isotope 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 include source material; or (2) any material artificially enriched in any of the foregoino, but does not. include source material.
3.
Effective kilogram of special nuclear material: (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 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, 4
Strategic special nuclear material:
Uranium-235 (contained in uranium enriched to 20 percent or more in the U-235 isotope), uranium-233, or plutonium.
5.
Isotope:
One of two or more atons with the same number of protons, but different numbers of neutrons in their nuclei.
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High enriched uranium (HEU): 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 uranium-235 by weight.
8.
Inventory difference (ID):
The arithmetic difference between a book inventory and the corresponding physical inventory, calculated by subtract-ing 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:
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 have been adjusted for any recognized bias.
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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 Commission and either the associated limit of error of the inventory difference (LEID) or some other limit granted by the Commission.
12.
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."
13.
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.
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Tabulation of Inventory Differences Inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM-Type Date U-235)
Explanation Babcock & Wilcox 42 HEU 2/28/83 337 The inventory difference falls within Naval fluclear Fuel Div.,
the applicable regulatory limit.
-645 The inventory difference falls within the applicable regulatory limit.
HEU 6/30/83 1,576 The inventory difference falls within the applicable regulatory limit.
Babcock & Wilcox 145 LEU 6/20/83
-823 The inventory difference falls within Apollo,, PA the applicable regulatory limit.
u, Babcock & Wilcox 778 LEU 4/30/83 46 The inventory difference falls within Lynchburg Research Center the applicable regulatory limit.
Lynchburg, VA Babcoch & Wilcox 1168 LEU 1/19/83
-8,388 The inventory difference falls within l
Commercial Nuclear the applicable regulatory limit.
Fuel Plant Lynchburg, VA LEU 5/16/83
-4,037 The inventory difference falls within the applicable regulatory limit.
Combustion Engineer-33 LEU 6/23/83 2,771 The inventory difference falls within ing, Hematite, M0 the applicable regulatory limit.
Combustion Engineer-1067 LEU 4/29/83 1,876 The inventory difference falls within ing, Windsor, CT the applicable regulatory limit.
t Exxon, Richland, WA 1227 LEU 3/18/83 2,076 The inventory difference falls within the applicable regulatory limit.
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Inventory Difference Licensee Material Inventory (Grans of Licensee No. SNM-fype Date U-235)
Explanation GA, Technologies 696 IIEU 1/3/03 492 The inventory difference falls within La Jolla, CA the applicable regulatory limit.
HEU 3/7/03 889 The inventory difference falls within the applicable regulatory limit.
HEU 5/9/83 186 The inventory difference falls within the applicable regulatory limit.
LEU 3/7/83 218 The inventory difference falls within the applicable regulatory limit.
General Electric, 1097 LEU No inventory was conducted during Wilmington, NC the reporting period.
hiuclear Fuel 124 LEU 4/7/83
-4,558 The inventory difference falls within Services, Erwin, TN the applicable regulatory limit.
IIEU 2/16/83 434 The inventory difference falls within the applicable regulatory limit.
HEU 4/20/83
-2,965 The inventory difference falls within the applicable regulatory limit.
1 HEU 6/23/83 1,683 The inventory difference falls within the applicable regulatory limit.
Rockwell, ESG 21 LEU 3/4/83 1
The inventory difference falls within Canoga Park, CA the applicable regulatory limit.
PU 3/4/U3 1
The inventory difference falls within the applicable reoulatory limit.
hEU 5/2/83
-280 Tne inventory difference falls within the applicable regulatory limit.
t Inventory Difference Licensee Material Inventory (Grams of Licensee flo. SNM-Type Date U-235)
Explanation Union Carbide, 639 HEU 1/4/83 27 The inventory difference falls within Tuxedo, NY the applicable regulatory limit.
3/3/83
-110 The inventory difference falls within p
the applicable regulatory limit.
4/27/83
-57 The inventory difference folls withir.
the applicable regulatory limit.
United Nuclear Corp.
368 HEU 1/14/83
-141 The inventory difference falls within Montville, CT the applicable regulatory limit.
HEU 3/18/83 260 The inventory difference falls within the applicable regulatory limit.
HEU 5/20/83 137 The inventory difference falls within the applicable regulatory limit.
Westinghouse, 1107 LEU 5/22/83 12,804 The licensee's initial investigation Columbia, SC did not identify the cause of the inventory difference exceeding the the limit of error.
However, the investigation is continuing with additional resources, t
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NRC is committed to the periodic publica on of licensed fuel facilities inventory difference data, following agency r,4siew the information and completion.of any related NRC investigations. Information i this report includes inventory difference data for active fuel fabrication of high enriched uranium, low enr/acilities ssessing more than one effective kilogram iched urani plutonium, or uranium-233.
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