ML20097D186
| ML20097D186 | |
| Person / Time | |
|---|---|
| Issue date: | 08/31/1984 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| NUREG-0430, NUREG-0430-V04-N02, NUREG-430, NUREG-430-V4-N2, NUDOCS 8409170410 | |
| Download: ML20097D186 (18) | |
Text
.
NUREG-0430 Vol. 4, No. 2 LICENSED FUEL FACILITY STATUS REPORT INVENTORY DIFFERENCE DATA JULY 1983 - DECEMBER 1983 i
UNITED STATES NUCLEAR REGULATORY COMMISSION p
re (n.fI hdI
/
1 t
N$09duggj e40831 0430 R pop l
_ m,
.b.
i :s
- y+
Si N.?
l s
t.
_ u 5-,.
s_
, nyjy,,,
%, - b;*
l y,
1, 5,
A-
.~
Y
^ Jg
\\
f 4.1 s
1
\\
4 s
-(
au s
- n Available frorn '
t N -
s s
s.-
NRC/GPO Sales Prograrr[..'
.s Superintendent of Documents
.-s5 Government Printing Office r. ~
~ ~ '
Washington, D. C. 20402 i
s
%.<,,[
A year's subscription consists of,2' issues for i 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' Washington, D. C. 20555 -
t b
~
\\n h
g S
s.g A
4
\\
f I
i N'
\\
U l-i N
3 f=
s,
['
- /,
s
\\
\\_E,'g(,
w
NUREG-0430 Vol. 4, No. 2 LICENSED FUEL FACILITY STATUS REPORT INVENTORY DIFFERENCE DATA JULY 1983 - DECEMBER 1983 ate Pu $fsh d? ugu t 19 4 0FFICE OF INSPECTION AND ENFORCEMENT U.S. NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555
- p....
Y l
l l
l
t L
i 1
ABSTRACT y
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.
I.
1 U
1
. )
e 4
h i.
\\
'_s
[
)[l
~
l
f-l
,f CONTENTS I
Page l
Abstract.............................................................-
1ii I'
Abbreviations........................................................
Vii l
l Inventory Difference Data...........................................
1 Definitions of Terms................................................
3 j
Tabulation of Inventory Differences..................................
5 I
1 l
k l
1 l
i l
V
1 i
f; f
It I
t ABBREVIATIONS CFR Code of Federal Regulations HEU high enriched uranium ID inventory difference LEID limit of error of the in/entory difference LEU low enriched uranium MUF material unaccounted for NRC U.S. Nuclear Regulatory Commission SNM special nuclear material S-R shipper-receiver l
l l
l V * #,
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 inventory difference data presented are for active, licensed facilities that are authorized to possess, in an unsealed form, at least one effective kilograra 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, 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 inventory every 6 months, except for General Electric Co., Wilmington, NC, which is required to inventory every 12 months.
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 for commercial 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 j
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 quantities of high enriched uranium and plutonium, NRC requires licensees to provide substantial 4
physical protection of this material in addition to controlling and accounting i
for it. Physical protection of this material includes safeguards measures such as barriers, intrusion alarms, armed guards, and offsite police response capa-i bilities.
Internal systems to control the movement of this nuclear material are also required by NRC.
Inventory differences arise when nuclear materials are processed (particularly l
when chemicai 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 measurement uncertainty (limit of error of the inventory difference - LEID) 1
r
]
."A T
may. signal an abnormal situation rcquiring determination of cause, the fact
)f tnat an inventory difference falls within its associated limit of error--even 5'
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 a
provided not only by the material accounting system but also by the internal
=
2 control system, the physical security system, NRC inspections and evaluations, and NRC and licensee investigations.
A nethod that licensees and NRC currently 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. 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 indi-cation of processing problems, biased or otherwise inaccurate measurements, book-keepi.ig 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.
During this reporting period (July 1 i
through December 31,1983) five of twenty-two inventories resulted in inventory i
differences that exceeded their associated limits of error. There were four s-gains and one loss of SNM.
An inventory gain that occurred during one of three
[-
HEU inventories at GA Technologies resulted from recovery of material held up in production process equipment.
Reanalysis of data from prior reporting periods 1
was the cause of a gain for one of three HEU inventories conducted at United 7
Nuclear Corporation. Decontamination and decommissioning activities at Rockwell,
'I ESG produced a gain of HEU for one inventory because of material recovered i
from filters and ducting. The first of three HEU inventorics at the Nuclear Fuel Services facility indicated that the inventory difference (a gain) exceeded
,=
the limit of error, but the licensee's subsequent investigation identified the 1
contributing factors. The next HEU inventory resulted in a loss that exceeded r
the limit of error, but which was within other applicable regulatory limits.
t The subsequent investigation did not completely explain the inventory difference, but corrective actions were initiated by the licensee.
n
^
9 2
l f
Definitions of Terms 1.
Source material:
(1) Uranium or thorium, or any combination thereof, in any physical or chemical form or (2) ores which contain by(weight one-ii) thorium, or twentieth of one percent (0.05%) or more of: (1) uranium, (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 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 l
include source material; or (2) any material artificially enriched in any of the foregoing, 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 atoms with the same number of protons, but different numbers of neutrons in their nuclei.
l 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 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) - (El + 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.
3
- 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 applicable regulatory limit":
The ID does not exceed 1.5 times any applicable LEID limits specified in 10 CFR 70.51(e)(5) or other LEID limits approved by the NP.C 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.
4
Tabulation of Inv:ntary Differences Inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM-Type Date U-235)
Explanation Babcock & Wilcox, 42 HEU 8/26/83
-881 The inventory difference falls within Naval Nuclear Fuel the applicable regulatory limit.
Div.,
Lynchburg, VA LEU 8/26/83 19 The inventory difference falls within the applicable regulatory limit.
HEU 10/28/83 251 The inventory difference falls within the applicable regulatory limit.
LEU 10/28/83 22 The inventory difference falls within the applicable regulatory limit.
v.
Babcock & Wilcox, 145 LEU No inventory was conducted during the Apollo, PA reporting period.
Babcock & Wilcox, 778 LEU No inventory was conducted during the Lynchburg Research reporting period.
- Center, Lynchburg, VA Babcock & Wilcox, 1168 LEU No inventory was conducted during the Commercial Nuclear reporting period.
Fuel Plant, Lynchburg, VA Combustion Engineer-33 LEU No inventory was conducted during the ing, Hematite, M0 reporting period.
1
. Inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM -
Type Date U-235)
Explanation Combustion Engineer-1067 LEU 10/13/83 4,187 The inventory difference falls within ing, Windsor, CT the applicable regulatory limit.
Exxon Nuclear Co.,
1227 LEU 11/10/83
-20,184 The inventory difference falls within Richland, WA the applicable regulatory limit.
GA Technologies, 696 HEU 7/11/83 597 The inventory difference falls within La Jolla, CA the applicable regulatory limit.
HEU 9/12/83
-1,188 The inventory gain resulted from the recovery of material held up in pro-duction process equipment.
LEU 9/12/83 24 The inventory difference falls within the applicable regulatory limit.
HEU 11/14/83
-271 The inventory difference falls within the applicable regulatory limit.
General Electric, 1097 LEU 8/8/83 50,612 The inventory difference falls within Wilmington, NC the applicable regulatory limit.
Nuclear Fuel 124 LEU 10/20/83
-3,184 The inventory difference falls within Services, Erwin, TN the applicable regulatory 1-imit.
HEU 8/26/83
-1,729 The inventory difference exceeded the limit of error, but the licensee's subsequent investigation identified the the contributing factors.
Inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM-Type Date U-235)
Explanation Nuclear Fuel 124 HEU 10/27/83 2,808 The inventory difference exceeded the Services, Erwin, TN limit of error, but was within other (Continued) applicable regulatory limits and license conditions. The licensee's subsequent-investigation did not comple,tely explain the inventory difference, but corrective actions were initiated for the identified-l sources of. difference.
HEU 12/28/83 1,212 The inventory difference falls within the applicable regulatory limit.
.Rockwell, ESG, 21 HEU 7/5/83 The inventory difference falls within Canoga Park, CA the applicable regulatory limit.
LEU 7/5/83 The inventory difference' falls within the applicable regulatory limit.
Pu 7/5/83
-2 The inventory difference falls within the applicable regulatory limit.
HEU 9/6/83
-154 The inventory difference falls within the applicable regulatory limit.
l Pu 9/6/83
-29 The inventory difference falls within the applicable regulatory limit.
i 1
- Represents a negligible quantity.
inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM-Type Date U-235)
Explanation Rockwell, ESG, 21 HEU 11/7/83
-722 The gain of special nuclear material is attributed to recovery of residual Canoga Park, CA holdup concentrated in filters and duct-(Continued) ing from areas undergoing de, contamination and decommissioning.
LEU 11/7/83
-23 The inventory difference falls within the applicable regulatory limit.
The inventory difference falls within U-233 11/7/83 the applicable regulatory limit.
Pu 11/7/83
-15 The inventory difference falls within the applicable regulatory limit.
=
Union Carbide, 639 HEU 7/5/83
-66 The inventory difference falls within the applicable regulatory limit.
Tuxedo, NY HEU 9/1/83
-90 The inventory difference falls within the applicable regulatory limit.
HEU 11/4/83
-17 The inventory difference falls witnin l
the applicable regulatory limit.
- Represents a negligible quantity.
_ _ _ - _ - = _ _ _ - -
Inventory Difference Licensee Material Inventory (Grams of Licensee No. SNM-Type Date U-235)
Explanation United Nuclear Corp.,
368 HEU 7/9/83 284 The inventory difference falls within Montville, CT the applicable regulatory limit.
HEU 9/9/83 268 The inventory difference falls within the applicable regulatory limit.
HEU 11/11/83
-860 The gain, which exceeds the LEID, is because of corrections resulting from reanalysis of data from prior reporting l
periods.
Westinghouse, 1107 LEU 10/22/83
-12,810 The inventory difference falls within Columbia, SC the applicable regulatory limit.
1 e
- U.S. CovEtietExt ralmTING orrtcE: 19s'.-421-299:333
u s. NuctEam mEauLaron, cou=>ssio=
i a t rom r Nu vu a,4=.e~,,, r,oc..,, v., N..,,,,,,,
geomu nn Eo',"E
IBLIOGRAPolC DATA SHEET NUREG-0430, Vol. 4, No. 2 SEE INSTmWCTICNS ON THE mf v Ems 2 fif LE ANQ 5Vef sTLE 3 LE AVE SLANn,
LicensedFuelFacilftyStatusReport
[
Inventory Difference Data July 1983 - Decembe 983
~
jooNr.
g vE m
.ur-omis, June 1984
/
e OATE REPomT ISSUED MoseTw VEam August 1984
>,E m. omo,No onuNii.,0N
,...E.No...L No.,E
,,.., <, c,
.,moacra.s
.om. u, Nuoum i
Office of Inspection and Enf cement "6"*'""""
U.S. Nuclear Regulatory Commis ion
/
Washington, DC 20555 7
10 SPoN50 ming omGANilaflON NAWE ANO WAILING A00mE55 fracsw
.a Cos,J tia TYPE oF mEPomi Status Summary Report Same as 7, above.
,,,,,,,,c,,,,,,,,,,,,,,,,,,,,
July 1, 1983-December 31, 1983 12 SVPPLEMENT Aav NOTES 13 ASST R ACY (20G eorfa er 'eset difference data, following agency review of $h}e information and completion of any NRC is conmitted to the periodic publication licensed fuel facilities inventory related NRC investigations.
Information in thi report includes inventory difference data for active fuel fabrication facilities / posse sing more than one effective kilogram of high enriched uranium, low enriched ura 'ium, p1 tonium, or urarium-233.
is occuwtNr aNav s.l-. nE vnomos oEscm<evons 4 s ava,La s,L,r v nuclear fue facilities e
stAnvENr inventory differnce data
{
Unlimited i
I
'4 SECVmeTY CLA$$ipeCatpCN D tOENtipital OPEN ENDED TEnvS o rov. Fro ifnel m ified
'l NvwSER os P AGE 5 10 PmeCE
2Cxmc gO. <!.1 2o N Com2VmcTCAIm C
b<2n
.d E
<O e l
)
.T ce
'C r4 a. oCW CmOmEmm% a u
0 o
i ta t
as a
r cf i
ssc a.
s'a n
i 6n mt t
s si cEuam tG s'
na aS t
T e
sN N
O I
S S
0 I
0 M56 3s M5 0
E SI2 EC.
SS SU T
C.
E E
Y N
A D
IT R
S O,
SA T
UV N
BI T
R 3A O LP T
I N
IF NZI F
FY U E H OT RS L
A A
R N
AW E
E P
L C
U N
i 1lll