ML20209F729

Licensed Fuel Facility Status Report.Inventory Difference Data.July-December 1985.(Gray Book II)

ML20209F729
Person / Time
Issue date:	08/31/1986
From:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
NUREG-0430, NUREG-0430-V06-N02, NUREG-430, NUREG-430-V6-N2, NUDOCS 8609120243
Download: ML20209F729 (15)

Text

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NUREG-0430 Vol. 6, No. 2 I

LICENSED FUEL FACILITY STATUS REPORT I INVENTORY DIFFERENCE DATA

JULY 1985 - DECEMBER 1985 UNITED STATES NUCLEAR REGULATORY COMMISSION i

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Available from i

Superintendent of Documents ,

U.S. Govemment Printing Office Post Office Box 37082 Washington, D.C. 20013-7082 A year's subscription consists of 2 issues fo-this publication.

Single copies of this publication are available from National Technical Information Service, Springfield, VA 22161 1

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NUREG-0430 Vol. 6, No. 2 1

l LICENSED FUEL FAClllTY STATUS REPORT INVENTORY DIFFFRF.NCE DATA s JULY 1985 DZCEM3ER 1985 b m -i _T _ _"l T - -

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ABSTRACT NRC is committed to the periodic publication of licensed fuel facilities' i 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 ura-nium, plutonium, or uranium-233.

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CONTENTS j fag

- Abstract............................................................. 111 i

4 Abbreviations........................................................ vii Inventory Difference Data ........................................... 1 i Definitions of Terms ................................................ 3 Tabulation of Inventory Differences .................................. 5 i

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ABBREVIATIONS CFR Code of Federal Regulations HEU high enriched uranium ID inventory difference LEID limit of error of the inventory difference l l LEU low enriched uranium MUF material unaccounted for NRC U.S. Nuclear Regulatory Commission i

Pu plutonium i

SNM special nuclear material

! S-R shipper-receiver U-235 uranium-235 v

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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 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 (HEU), plutonium, and ura-nium-233) or at least one effective kilogram of low enriched uranium (LEU).

For example, LEU is the nuclear fuel used in commercial light-water nuclear ,

power reactors. The U.S. Nuclear Regulatory Commission (NRC) requires licen-sees possessing significant quantities of HEU, plutonium, or uranium-233 to conduct an inventory every 2 months. Licensees possessing one effective kilo- l gram of low enriched uranium are required to inventory every 6 months, except for General Electric Co., Wilmington, NC, which is required to inventory every 12 months. i[

it is important to understand the distinction between the low strategic signifi-cance of LEU and the higher strategic significance of HEU and plutonium. Most i 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- h gic signiilcarce. They include a formal structured system for material control and accounting and minimal physical security raeasures. On the other hand, because of the higher strategic significance of HEU and plutonium, NRC requires licensees to provide substantial physical protection of this material in addition to contro'llir.g 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 by NRC. l ID!, arise when nuclear materials are processed, particularly when chemical oper-ations are involved. These differeacts car. result froa sariations in weasuring

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and processing, measurement inaccuracy or imprecision, unmeasured flows from the process, unmeasured inventory, bookkeeping errors, or lors or theft. Although an JD larger than its overall measurement uncertainty may signal an abnormal situation requiring determir,ation of the cause, the fact that an 10 fail within its associated limit of error--evon an ID cf zero- provides no automatic or con-clusive proof that loss or theft of aaterial has not occurred. Therefore, NRC relies on infors;ation provided not only by the material aqcounting syste but also by the internal control system, tSe physical security system, NRC- Mpec-tions and evaluations, and NRC and licenw investigations.

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The concept of the limit of error of the inventory difference (LEID) is a method that licensees and NRC currently use to determine the significance of the ID. LEID is a calculated estimate of the measurement uncertainties that

.are associated with a plant's processing activity. The ID should be less than the LEID 19 out of 20 times, if the ID results only from measurement uncertainty.

Because an ID that exceeds its associated LEID may be an indication of process-ing problems, biased or otherwise inaccurate measurements, bookkeeping errors, or loss or theft of material, NRC accordingly requires licensees to take increas-ingly stronger investigative actions depending on how much the inventory dif-ference exceeds both LEID and minimum quantities specified in 10 CFR $74.13(b),

(namely, 200 grams of Pu,-300 grams of U-235 contained in HEU, or 9,000 grams of U-235 contained in LEU). If the ID exceeds its LEID, but does not exceed the minimum quantities, no formal investigation is required. However, the licensee is required to try to determine why the ID exceeded the LEID.

The ids for this reporting period (January 1 through June 30,1985) are indi- ,

cated in the Tabulation 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. None of the ids was such as to require an NRC investigation.

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Definitions of Ter.ms

1. Special nuclear material (SNM): (1) Plutonium, uranium-233, uranium enriched 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 tn be special nuclear material, but does not include scurce material; or (2) any material artificially enriched in any of the foregoing, but does not include source material.

2. Source material: (1) Uranium or thorium, or any combination thereof, in i

any physical or chemical form or (2) ores which contain by weight one-l twentieth of one percent (0.05%) or more of: (i) uranium, (ii) thorium, or (iii) any combination thereof. Source material does not include special nuclear material.

3. Effective kilogram of saecial nuclear 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 deci-mal 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 plu-tonium.

5. Isotope: One of two or more atoms with the same number of protons, but different numbers of neutrons in their nuclei.

6. High enriched uranium (HEU): Uranium whose isotope content is 20 percent or more uranium-235 by weight.

7. 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 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) - (EI + R).

9. Limit of error: The uncertainty component used in constructing a 95 per-cent confidence interval associated with a quantity after any recognized bias has been eliminated or its effect accounted for.

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10. 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.

11. "The inventory difference falls within the a)plicable regulatory limit":

The ID does not exceed 1.5 times any applica)le LEID limits specified in 10 CFR 70.51(e)(5) or other LEID limits approved by the NRC under 10 CFR 70.51(e)(6).

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."

14. 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 No. SNM- Type Date U-235 or Pu) Explanation Licensee Babcock & Wilcox, 42 HEU 8/29/85 226 The. inventory difference. falls within Naval Nuclear Fuel the applicable regulatory limit.

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I Lynchburg, VA HEU 10/31/85 -411 The inventary difference falls within j the applicable regulatory limit.

- Babcock & Wilcox, 778 HEU 11/3/85 3 The inventory difference falls within 4

Lynchburg Research the applicable regulatory limit.

Center, Lynchburg, VA Pu 11/3/85 -3 The inventory difference falls within the applicable regulatory limit.

"' Babcock & Wilcox, 1168 LEU 8/12/85 641 The. inventory difference falls within Commercial Nuclear the applicable regulatory limit.

Fuel Plant, Lynchburg, VA Cintichen, Inc. 639 HEU 7/1/85 -33 The inventery difference falls within Tuxedo, NY the applicable regulatory limit.

HEU 9/5/85 -55 The inventcry difference falls within r

the applicable regulatory limit.

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HEU 11/5/85 49 The inventory difference falls within the applicable regulatory limit.

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Inventory Difference Licensee Material Inventory Grams of Licensee No. SNM - Type Date U-235 or Pu) Explanation Combustion Engineer- 33 LEU 7/19/85 272 The inventory difference falls within ing, Hematite, M0 the applicable regulatory limit.

Combustion Engineer- 1067 LEU 9/17/85 40 The inventory difference falls within ing, Windsor, CT the applicable regulatory limit.

Exxon Nuclear Co., 1227 LEU 9/6/85 9,244 The inventory difference falls within Richland, WA the applicable regulatory limit.

GA Technologies, 696 HEU 7/22/85 -49 The inventory difference falls within La Jolla, CA the applicable regulatory limit.

HEU 9/23/85 0 The inventory difference falls within

, the applicable regulatory limit.

LEU 9/23/85 -7 The inventory difference falls within the applicable regulatory limit.

HEU 11/18/85 -3 The inventory difference falls within the applicable regulatory limit.

General Electric, 1097 LEU 8/5/85 27,468 The inventory difference falls within Wilmington, NC the applicable regulatory limit.

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Inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM- Type Date U-235 or Pu) Explanation Nuclear Fuel 124 HEU 7/9/85 -2,894 The inventory difference falls within Services, Erwin, TN the applicable regulatory limit.

HEU 8/26/85 -6 The inventory difference falls within the applicable regulatory limit.

HEU 10/28/85 -288 The inventory difference falls within the applicable regulatory limit.

HEU 12/26/85 2,808 The inventory difference exceeded the i limit of error. An investigation was performed by the licensee and the determined cause of the ID was attri-buted to difficulty in measuring a

" specified material type. A resultant gain the following period supported this conclusion.

Rockwell, International 21 Pu 8/1/85 -8 The inventory difference falls within Santa Susana, CA the applicable regulatory limit.

HEU 8/1/85 -9 The inventory difference falls within the applicable regulatory limit.

Pu 10/2/85 8 The inventory difference falls within the applicable regulatory limit.

HEU 10/2/85 7 The inventory difference falls within the applicable regulatory limit.

Pu 12/2/85 0 The inventory difference falls within the applicable regulatory limit.

HEU 12/2/85 0 The inventory difference falls within the applicable regulatory limit.

Inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM- Type Date U-235 or Pu) Explanation United Nuclear Corp., 368 HEU 7/19/85 1,440 The inventory difference exceeded the Montville, CT limit of error. This loss occurred primarily because of corrections resulting from recalculation of data from prior reporting periods.

HEU 9/20/85 249 The inventory difference falls within the applicable regulatory limit.

HEU 11/22/85 520 The inventory difference exceeded the limit of error. This loss resulted primarily from the recalculation of certain material due to a bias involving

' high assay results.

l Westinghouse, 1107 LEU 12/31/85 28,369 The inventory difference falls within i

Columbia, SC the applicable regulatory limit.

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EIRC PORRI 33

@ BIEUOGRAPHIC DATA SHEET NUREG-0430, Vol . 6, Mo. 2 See top 6TRuCTICess Oss feet Rtveest 2 f tTLE Asso sueTITLE 3 LEAVE eLA884 Licensed Fuel Facility Status Report Inventory Difference Data I o^" aoa' co*"",o.AR July (1985 - December 1985 7 T ,. l uut.eOmisi JWe 1986 f e OAn me ORT inu O MO.n v AR

/ August l 1986

7. PEAF OmuissG ORGAR12 AT v a to CoeJ AME A8eO MasLiseG ADDRESS ifaca e OJECTITASE/WeORK uself seuesetR Office of Inh ection and Enforcement I U.S. Nuclear ulatory Commission F"""'"*"'"""""

Washington, D. 20555 12 SPO8eSOmsfeG ORGAesi2ATIO8e NAME A800 Mai ADDRESS ifacaudule Campf its TYPE OF REPORT Status Summary Report t PERIOD COvtRED idacessaw esusJ Same as 7. above.

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) July 1,1985-December 31, 1985 13 AtSTRACT (J00 sysres er w NRC is committed to the periodic pu lica on of licensed fuel facilities inventory difference data, following agency re e of the infonnation and completion of any related NRC investigations. I nforma t'. in this report includes inventory difference data for active fuel fabrication facil ies possessing more than one effective kilogram of high enriched uranium, lo e iched uranium, plutonium, or uranium-233.

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