ML20199C070

Supplements & Clarifies 971218 Responses to NRC 970907 RAI Re Ynps License Termination Plan

ML20199C070
Person / Time
Site:	Yankee Rowe
Issue date:	01/23/1998
From:	Jeffery Grant YANKEE ATOMIC ELECTRIC CO.
To:	Fairtile M NRC (Affiliation Not Assigned), NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
BYR-98-003, BYR-98-3, NUDOCS 9801290094
Download: ML20199C070 (29)

Text

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• * ' YANKEE ATOMIC ELECTRIC COMPANY.

"# "ll*.g*)l,'f,*g'"

580 Main Street, Bolton, Massachusetts 017401398

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January 23,1998 BYR 98 003 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Attention:

Mr. Morton B. Fairtile, Senior Project Manager Non-Power Reactors and Decommissioning Project Directorate Division of Reactor Program Management Office of Nuclear Reactor Regulation

References:

(a)

License No. DPR-3 (Docket No. 50-29)

(b)

Letter, D. K. Davis (YAEC) to M. B. Fairtile (NRC), Responses to Request for AdditionalInformation and Revisions to Yankee Nuclear Power Station License Termination Plan, dated December 18,1997 (c)

Letter, M. B. Fairtile, U. S. Nuclear Regulatory Commission (NRC) to J. A.

)

Kay, Yankee Atomic Electric Company (YAEC), Request for Additional l

Information - License Termination Plan, dated September 9,1997 (d)

Letter, A. C. Kadak (YAEC), to M. B. Fairtile (NRC), License Termination l

Plan for Yankee Nuclear Power Station, dated May 15,1997

Subject:

CLARIFICATION OF RESPONSES TO REQUEST FOR ADDITIONAL INFORMATION ON YNPS LICENSE TERMINATION PLAN

Dear Mr. Fairtile:

On December 18,1997, Yankee Atomic Electric Company (YAEC) submitted responses (Refeience (b)) to a request for additional information from the U.S. Nuclear Regulatory Commission (Reference (c)) concerning the Yankee Nuclear Power Station (YNPS) License Termination Plan. Yankee would like to supplement and clarify these responses as described below.

As discussed in Appendix A, Section 4.4.3 of the License Termination Plan (Reference (d)), no exposure rate measurements will be taken on structures and components where the only 1.ource of radioactivity is surface contamination. Reference (b) describes the calculations that were performed to demonstrate that the exposure rate at one meter from such surfaces at YNPS will be less than 5 pR/hr above background if the surface contamination levels are below the limits in Regulato y Guide 1.86. To supplement this description, we are enclosing the memorandum that documents these calculations and contains the output from the MICROSillELD* computer code used in the analysis.

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s In Response No. 6 of Reference (b), it is stated, "for non gridded survey units, the survey locations will generally be designated prior to the survey and will be selected at biased locctions where the potential for contamination is greatest, at locations evenly distributed throughout the survey unit, or at a combination of these locations." This statement is not intended to imply that measurements may be taken only at biased locations without also taking measurements distributed throughout the remainder of a structural or open land survey unit. This is consistent with Appendix A, Section 4.3 of the License Termination Plan, which states that measurement locations will be distributed "throughout" a survey unit. In addition to measurements distributed throughout a survey unit, -

some measurement lccations may be selected from locations most likely to accumulate contamination.

These clarifications are minor in nature, do not require changes to the License Termination Plan, and are not expected to adversely impact NRC review and approval of the License Termination Plan by February 1998. If you have any questions or require further information, please contact me.

Sincerely, I

L YANKEE ATOMIC ELECTRIC COMPANY (MT,

kt7 Ja e M. Grant D ommissioningManager Enclosure Requested Distribution with Enclosure; Public Document Room - original and 3 copies M. Fairtile, Senior Project Manager, NRR - 3 copies R. Bellamy, Chief, Decommissioning and Lab Branch, Region I - I copy J. Ilickey, Chief, Low Level Waste and Decommissioning Projects Branch, NMSS ATTN: L. Pittiglio - I copy

=

s CC:

Mr. Robert M. Hallisey, Director Radiation Control Program Massachusetts Department of Public Health 305 South Street Boston, MA 02130 Commissioner Richard P. Sedano Vermont Department of Public Service 120 State Street 3rd Floor Montpeller, VT 05602 Mr. Peter LaPorte, Director ATTN: Mr. James Muckerheide l

Massachusetts Emergency Management Agency 400 Worcester Road P. O. Box 1496 Framingham, MA 01701-03173 l

4.

,s i,

Memorandum YANKEE ATOMIC.ROWE To:

Gregory M. Babineau CC Pete Hollenbeck 9 Q==1; Tile, RP File From:

Paul R. Cassidy Date:

June 24,1997 subject: Esatuation of Exposure Rates from Surface Contamination Sources file # RP 97-40 t

According to the YNPS Final Status Survey Plan, in structure surveys, gamma exposure rates anill only be taken on activated structures or components (para. 4.3.1, YNPS Final Status Survey Plan). This is an exception to Draft NUREG'CR 5849 which recommends exposure rate measurements in all structures.

The enclosed paper (pages I thru 6) and its enclosures (1 1 through 1 8 and 2 1 through 2 8) show the justification for not requiring exposure rate measurements in surface I

contaminated areas when these areas already meet the requirements of Reg. Guide 1.86 and NUREG 1500.

Eliminating these unnecessary readings is both time and cost efficient.

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Prepared by:

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n4dC Date 64w6 Ree.ed sy.

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Evaluation of E..'osure Rates from Surface Activity Contamination Sources

1. Introduction A limit on expocure rate has been included in the release criteria approved to date by the Nuclear Regulatory Commission (NRC) for release of decommissioned nuclear reactor facilities for unrestricted use. The exposure rate limit was inillally expressed as a limit of 5 pR/hr above background measured at one meter from the surface and was specifically app!!ed to residual radioactivity from gamma emitting material contamination or activation products that may exist as volume contamination. This was initiated by the NRC Staff as part of release criteria approved for the Stanford University Research Reactor decommissioning in 1981 [USB1).

However, in subsequent NRC approved final survey plans at Pathfinder (1991),

Shoreham (1993) and Frt St. Vrain (1995), the exposure rate criterion was expanded to include areas where g., nma emitters may be present in surface contamination without considering if volume contaminated sources are present as well. Also, the guidance document NUREG/CR 5949, issued by the NRC in 1992, instructs that exposure rate measurements be taken at one meter from surfaces where

• gamma emitting radionuclides are among the potential contaminants" [US92).

As shown in this peper, if volume contaminated materials are not present and if surface contamination levels are below the limits in Regulatory Guide 1.86 (US74), the exposure rate at one meter from the surface will be below 5 pR/hr above background.

Thus, showing that surface contamination release criteria are met is sufficient to satisfy the exposure rate criterion of 5 pR/hr. In sffected areas of the facility where volume contaminated sources may be present such as near the Reactor Bloshield, exposure rate and surface contamination measurements are both necessary. Exposure rates in excess of 5 pR/hr could be present if the volume source contribution is near 5 pR/hr and surface beta-gamma contamination levels approaching 5000 dpm/100 cm are 2

prosent. Given the radionuclide composition at, YNPS this is concluded to be unlikely, however.

YNPS_ ERA wpd Page 1 of 6 5/1/97

4%.

S Exposure Rates from Surface Activity C:ntamination Sourc:s

2. Expospro Rates From Surface Sources To demonstrats' that surface contamination limils are the limiting condition, exposure rates from several surface source exposure scenarios are evaluated. The most conservative assumption is that the contaminated surface source is comprised entirely c,f Co 60. This isotope has the highest average gamma energy per disintegration of any

. of the radionuclides expected to be present in reactor faci'ities a few years siter shutdown. Several cases are examined. First, it is consor,atively assumed that the surface contamination is an infinite surface uniformly contaminated with Co40. Then the exposure rate is calculated for more reallrtic source geometries represented by typical equipment rooms and for a large eru such as the Turbine Dock at YNPS.

Finally, a realistic bounding case is evaluated. This assumes that the mixture of -

radionuclides actually expected at YNPS is present in a typical equipment room uniformly contaminated at 5000 dpm/100 cm'.

l 2.1 Large Plane Source Unifonnly Contaminated With Co 60 The exposure rate from en infinite plane source uniformly contaminated with Co40 at 5000 dpm/100 cm' is derived from the dose factors published by the NRC in i

NUREG 1500 [US94).- The dose factor for the building occupanc used. NUREG 1500, Table B 2 indicates that 5190 dpm/100 cm'y scenario is produces a dose rate of 15 mrom/yr, it assumes an occupancy factor of 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> per year [US92),

i This translates to an average dose rate of 7.2 prem/hr per 5000 dpm/100 cm'.

Converting rem to R (0.869 R/ rem for typical gamma energies,[US70)) gives 6.3 pR/hr for 50'>0 dpm/100 cm'.

As a check on the above result, exposure rates at one meter from a serises of disk surface sources of increasing radius were calculated using the MICROSHIELD computer code. The source strengths for each were 50 ') dpm/100 cm' Co-60 and

' the exposure rate at one meter from the surface at the L.rdral axis normal to the

?

~ disk surface was calculated. The MICROSHIELD* retalts are included as. These results are summarized in Figure.1 which shows that the exposure rate at one mater from a large surface source approaches a limit of 9

. pR/hr as the area of the surface approaches infinity. The calculadions from which Figure 1 is derived show that for a 1000 m' source area, the exposure rate is 5.2 -

2 pR/hr, and for a 10,000 m source it is 7.2 pR/hr. These are consistent with the NUREG 1500 Co 60 dose factor for the building occupancy scenario.

YNPS_ ERA.wpd Page 2 of 6 5/1/97

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2.2 More Realistic Case Typical Equipment Room in most power reactor facilities, and at YNPS, typical affected areas are equipment rooms where the infinite plane source assumption is not met. Several more realistic room source geometries are evaluated and the results are -

summarized in Figure 2. First, consider an equipment room with a 10x10 meter floor area. Following the survey design assumptions of NUREG/CR 5849, the floor and lower walls are treated as a unit. It is assumed that the floor and wall surfaces up to 2 meters above the floor are uniformly contaminated with Co40 at 5000 dpm/100 cm'. Using MICROSHIELD*, the exposure rate to a receptor located in the center of the room at one meter from the floor is calculated. This scenario

- results in an exposure rate of 3.9 pR/hr. A more conservative scanario for this room and source combination is to move the receptor to a u:wner one meter from the floor and adjacent well surfaces. This results in an exposure rate of 4.3 pR/hr.

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Exposura R t:s from Surface Activity Contamin:ti:n Sourc o 2.3 Large Area Source YNPS Turbine Dock Exampin The floor and walls below two meters of a large area of the facility are assumed to be uniformly contaminated with Co-60 at 5000 dpm/100 cm. This is identified as 2

scenario 3 in Figure 2. The dimensions of tho YNPS Turbine deck are used in this scenario. The calculated exposure rate to a receptor located at the center of the room one meter from the floor is 4.76 pR/hr. Moving the receptor point to a comer of the room increases the calculated dose rato only slightly to 4.8 pR/hr. This is becauso the effective source area 'seen" by the receptor is not very sensitive to changes in position in a large room such as this.

2.4 Large Area Contaminated with Expected Radionuclide Mix A more realistic, but still conservative bounding case for YNPS was evaluated.

This is identified as Scenario 4 in Figure 2. In this case, the Turbine Deck floor and walls up to two meters are uniformly contaminated at 5000 dpm/100 cm. The 2

mixture of radionuclides expected to be potentially present in residual contamination in the YNPS Primary Auxiliary Building is assumed. As reported in reference [CA97J this mixture is: Co-60 (9.4%); Cs 137 (4.1%); Fe-55 (66.2%); Ni-63 (19%); and Pu 241 (1.1%), all decayed to 1/1/97. Of these, only Co40 and CS.

137 (Ba 137m gammas) contribute significantly to the exposure rate at one meter from the surface. The calculated exposure rate to a receptor in tne center of the room for this scenario is 0.47 pR/hr. This is within tne i 1.960 uncertainty or error i

band 1.7 background exposuro rates at YNPS and is not likely to be " detectable" i-with normal final status survey exposure rate instruments.

2.5 Exposure Rates from Hot Spots Release criteria in the YNPS Final Status Survey Plan permit individual localized areas of surface contamination of up to three times the guideline value, provided the area weighted average does not exceed the guideline value. The effect of small area sources of elevated contamination combined with average levels at the guideline value is considered. Exposure rates from small surface sources uniformly contaminated with Co-60 at 15,000 dpm/100 cm are calculated. Results 2

from Figure 1 and Attachrlent i are used. This shows that the exposure rate at one meter from the center of a 100 cm source of Co 60 is 0.008 pR/hr. If the 2

source area is increased to 1000 cm, the exposure rate is 0.08 pR/hr. When the 2

receptor point is moved one mater off-axis from the center of the sources. Se exposure rate drops to about one half in both cases. Under a worst case scenario, several localized 15,000 dpm/100 cm hot spots are added to uniformly distributed 2

5000 dpm/100 cm Co-60 surface contamination such as evaluated in Scenarios 2

ed 3. The hot spots would add at most 0.2 to 0.3 pR/hr to the calculated expow 1 rates. If the radionuclide mix at YNPS is ass"med, the incremental exposure from the hot spots is infinitesimal, less than 0.02 pR/hr.

YNPS,_ ERA.wpd Page 4 of 6 5/1/97 1

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4 Expo:ure Rat:s from Surfaco Activity Contamination Sourc:s t igure 2 Exposure Scenarios

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' Emmy bom 10 x 10 m floor area. Assumes that floor and walls below 2 m are uniformly contaminated with Co40 at a surface concentration of 5000 a.,xn/100 cm'.'

The dose recepor point is loca'ed % the center of the room @ 1 m from the floor.

Results Source Composition source p R/hr-R/N dom /100 cm pCl/cm 3

3 floor 3,14 Co 60 5000 2.25E-05 single well-0.18 Total (floor + 4x wal0 3.86 Scenario 2 -

The same room size and source assummions as in Scenario 1.

The dose receptor point is in a comer @ l meter from the floor and each wall.

Results -

Source Compooltion source p R/hr R/N dom /100 cm pCl/cm 3

3 floor 1.96 Co-60 5000 2.25E 05 near wall 1.10 t

far wall 0.06 Total (floor + 2x near well + 2x far wain 4.28

. Scenario 3 Large open area such as YNPS Turbine Deck with floor dimensions 46 x 22 m.

Assumes that floor end walls below 2 meters are uniformly contaminated with Co40 at a surface concentration of 5000 dpm/100 cm'.

The dose receptor point is located in the center of the floor @ 1 m from the surface.

Results Source Composition source u R/hr-R/N dpm/100 cm pCl/cm 2

2 floor 4.54-Co40 5000 2.25E-05 side wall 0.10 end well 0.01 Total (floor + 2x side wall + 2x and wal0 4.76 _

Scenario 4-The same geometry is assumed as in Scenario 3. However the radionuclide mix is assumed to be the same as reported for the Primary Aux Building as shewn below, p

The radionuclide concentrations are scaled to total 5000 dpm/100 cm2.

Results Source Composition source p R/hr PJN dpm/100 cm' pCl/cm3 floor 0.47 Fe 55 3310 1.49E-05 side wall 0

Ni43 950 4.28E-06 end wall O

Co40 470 2.12E-06 Total (floor + 2x sLie wall + 2x end wal0 0.47 Cs 137 205 9.23E-07 YNPS ERA.wpd Page 5 of 6 5/1/97 1

C Exposure Rates from Surface Act'vity Cont: min:ti:n Sourc:s 3.

Conclusions The cale.ulations presented above show that it is possible in theory to slightly exceed an oxposure rate of 5 pR/hr at one meter from surfaces uniformly contaminated at Regulatory Guide 1.86 contamination limits if Co-60 is the sole contaminant. This highly conservative result is obtained for large plane surface sources 1000 m'or greater in area. For more realistic geometries such as equipment rooms or a large area like the YNPS Turbine Deck, it is possible to approach 5 pR/hr if Co-60 is the sole contaminant and present in the form of uniformly distributed surface contamination at a level of 5000 dpm/100 cm'. However, these conditions do not apply at YNPS. When the mixture of radionuclides actually present is considered, the maximum calculated exposure rate from a large contaminated surface area such as the Turbine Deck, is less than 0.5 pR 5r. Therefoie, it is concluded that no conditions exist at YNPS where exposure rate measurements are necessary in areas where the only potential sources of residual contamination are surface contamination.

4.

References CA97 Paul R. Cassidy, Memorandum to Gregory M. Bauineau, " Site Specific Guideline Values", J=ry 15'iv1337. JWG Sy) /997 US70 US Department of Health, Education and Welfare, Public Health Servive,

" Radiological Health Handbook", Revised Edition, January 1970.

US74 US Atomic Energy Commission,"Terminat&.of Operating 1.icenses for Nucler Reactors', Regulatory Guide 1.86, June 15.'4.

US81 US Nuclear Regulatory Commission, Letter from John F. Stoltz to Roiand A.

Finston, Stanford University, March 17,1981, Docket No. 50-141.

US92 US Nuclect Regulatory Commission, Residual Radioactive Contamination from Decommissioning", NUREG/CR-5512, prepared by Pacific Northwest Laboratory,1992.

US94 US Nuclear Regulatory Commission, " Working Draft Regulatory Guide on Release Criteria for Decommissioning: NRC Staffs Draft for Comment", NUREG-1500, August 1994.

5. Attachments Attachment '..

MICROSHIELD Results - Exposure Rate from Disk Sources 100cm2 to 100,000 m' in area..

MICROSHIELD Results - Exposure Rate from Rectangular Surface Sources YNPS_ ERA.wpd Page 6 of 6 5/1/97

v

-l Exposure Rit:s from Surface Activity Contamination Sourc:s

- - Exposure Rate from Disk Sources 100cm to 100,000 rr.2 in Area 2

MicroShield 4.00 -

Ser131 #4.00-00261 Bruce J. Mann P.E.

Page

1 File Ref:

DOS File Date:

/

/

Run Date: April 26, 1997 By:

Run Times 12:42 p.m. Saturday Checked:

Duration:

0:00:01 Case

Title:

100 cm2 Co-60 Disk Source - Dose Rate in Air 6 1m GEOMETRY 3 - Disk centimaters feet and inches Dose point coordinate X:

100.0 3.0 3.4

. Dose point coordinate Y:

0.0-0.0

.0 Dose point coordinate Z:

0.0 0.0

.0 Disk radius:

5.642 0.0 2.2 Air Gap:

100.0.

3.0 3.4 Scurce Area: 100.004 sq cm

.107643 sq ft.

15.500- sq in..

MATERIAL DENSITIES (g/cm*3)

Air 0.00122 BUILDUP-Method: Buildup-Factor Tablen The material-reference is Air Gap 1

INTEGRATION PARAMETERS Quadrature Order Radial 20 Circumferential 20 SOURCE NUCLIDES Nuclide.

curies

1. Ci/cm2 Co-60 2.2501e-009 2.2500e-005

===================

RESULTS

===================

Energy Activity Energy Fluence Rate Exposure Rate In Air (MeV)

(p'iotons/sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No Buildup With Buildup 0.6 1.35Be-002 6.410e-008 6.467e-008 1.251e-010 1.262e-010 1.0 8.325e+001 6.563e-004 6.603e-004 1.210e-006 1.217e-006 1.5 8.325e+001 9.859e-004 9.903e-004 1.659e-006 1.666e-006 TOTAL:

1.665e+002 1.642e-003 1.651e-003 2e" 4e-006 2.883e-006 YNPS_ ERA.wpd 1-1 5/1/97 1

o-..

Exposure Rates from _Si:. Tac 3 Activity Contaminati:n Sourc:s f Exposure Rate from Disk Sources 100cm to 100,000'm'in Area 2

.MicroShield 4'.00 -

Serial-#4.00-00261 Bruce J. Mann P.E.

DOS Files Date

/

/

Run Dates April 26, 1997 By:

Run Times:12 47 p.m.-Saturday Checked Duration:

0:00:01

-Case

Title:

1000 cm2 (0.1m2) Co-60 Disk Source - Dose Rate-in Air 9 la GEOMETRY-Disk-centinators feet and inches

-Dose-point coordinate X:

100.0 3.0-3.4 Dose point coordinate Y:

0.0 0.0

.0 Dose point coordinate 2:

'O.0 0.0

.0 Disk radius:

17.841 0.0 7.0 Air Gap:

100.0 3.0 3.4 Source - Area t - 999.973 sq On 1.07636 sq ft.

154.996 sq in.

MATERIAL DENSITIES (g/cm*3)

_ Air

_0.00122 BUILDUP-l Method: Buildup Factor Tables The. material reference is Air-Gap-INTEGRATION PARAMETERS Quadrature Order Radial:

20 Circumferential-20 SOURCE NUCLIDES Nuclide curies pci/cm8 Ca-60 2.2499e-008 _ 2.2500e-005-

.... - = = = = = = = = = = = = = = = = = = = = = = = = = = RESULTS

===================

Ener Activity.

' Energy Fluence Rate Exposure Rate In Air

-(MeV;

_(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No. Buildup With Buildup No Buildup With Buildup

0. 6-1.358e-001

-6.320e-007 6.376e-007 1.234e-009 1.244e-009 1.0 8.325e+002 6.471e-003 6.510e-003 1.193e-00S 1.200e-005 1.5

-8.325e+002 9.720e-003 9.764e-003 1.635e-005 1.643e-005 TOTAL:

1.665e+003 1.619e-002 1.627e-002 2.828e-005 2.843e-005 YiiPS_ ERA.wpd 1-2 5/1/97

__b

1 L* '.~

Exposure Rates from Surface ActMty C:ntaminatisn Sourc:s o. Exposure Rate from Disk Sources 100cm to 100,000 m'in Area 2

MicroShield'4.00

. Serial #4.00-00261 Bruce J.-Mann P.E.

.Page*..: 'l -

File Ref:

-DOS? Files Date:-

/

/

-Run1Date: April 26, 1997 By:-

Run Time 12:51 p.m.fsaturdhy Checked:

Durations 0300:01 Case Title l'm2 Co-60 Disk-Source - Dose-Rate in Air 9 la GEOMETRY 3 - Disk centimeters feet and inches Dose point coordinate X:-

100.0 3.0

' 3. 4

Dose point coordinate Y:

0.0

0. 0 -

.0

Dose point coordinate-2:

0.0-0.0

.0 Disk radius 56.419 1.0 10.2 Air Gap:

'100.0 3.0 3.4 Source Area: 10000. sHg cm 10.7639 sq;ft.

1550.01 sq in.

MATERIAL DENSITIES (g/cm*3)

Material Air-Gap Air 0.00122' BUILDUP i

Method:' Buildup = Factor-Tables The material reference-is Air' Gap INTEGRATION PARAMETERS Quadrature order-

-Radial 20'

Circumferential 20 SOURCE NUCLIDES Nuclide curies pCi/cm8 Co-60 2.2500e-007 2.2500e-005

===================

RESULTS.-===============================

Energy'

-Activity Energy Fluence Rate Exposure Rate In Air

-(MeV)-

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No-Buildup With Buildup

0. i6 1.358e+000 5.570e-006 5.623e-006 1.087e-008 1.097e-008' 1.0 8.325e+003 5.704e-002 5.741e-002 1.051e-004 1.058e-004 1.5 8.325e+003' 8.569e-002 8.610e-002 1.442e-004 1.449e-004 TOTAL:-

1.665e+004 1.427e-001 1.435e-001 2.493e 904 2.507e-004

- YNPS_ ERA.wpd 1-3 5/1/97 n

g a

Exposure Rat:s from Surfac3 Activity Contamin: tion Sourc:s

,-. Exposure Rate from Disk Sources 100cm to 100,000 m'in Area 2

MicroShield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.

Page'

'l File Ref:

DOS File:

Date: _/

/

Run Date: April 26, 1997 By:

Run Times 22:52 p.m. Saturday Checked:

Duration:

0:00:01 Case

Title:

10 m2 Co 60 Disk Source - Dose Rate in Air 9 la GEOMETRY 3 - Disk centimeters feet and inches Dose point coordinate X:

100.0 3.0 3.4 Dose point coordinate Y 0.0 0.0

.0 Dose point coordinate Z:-

0.0 0.0

.0 Disk radius:

178.4 5.0 10.2 Air Gap:

100.0 3.0 3.4 Source Area: 99986.1 sq cm 107. 624.sxg f t.

15497.9 sq in.

Material Air Gap Air 0.00122 BUILDUP Method: Buildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order Radial 20 Circumferential 20 SOURCE NUCL1 DES

-Nuclide curies pri/cm*

C3-60 2.2497e-006 2.2500e-005

===================

RESULTS

===================

Energy Activity Energy Fluence Rate Exposure Rate In Air (MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No Buildup With Buildup 0.6 1.358e+001 2.873e-005 2.910e-005 3.608e-008 5.680e-008 1.0 8.324e+004 2.945e-001 2.970e-001 5.428e-004 5.475e-004 1.5 8.324e+004 4.426e-001 4.455e-001 7.447e-004 7.495e-004 TOTAL:

1.665e+005 7.371e-001 7.426e-001 1.288e-003 1.297e-003 YNPS_ ERA.wpd 1-4 5/1/97

Exposura Rates from Surface Activity Contamination Sources

,- - Exposure Rate from Disk Sources 100cm to 100,000 m'in Area 2

MicroShield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.

Page -

t 1 File Ref:

DOS File:

Date

/

/

Run Date: April 26, 1997 By:

Run Times-12:54 p.m. Saturday Checked:

Duration:

0:00:01 Case-Titles 100 R2 Co-60 Disk Source - Dose Rate in Air 9 la GEOMETRY 3 - Disk centimeters feet and inches Dose point coordinate X:

100.0 3.0 3.4 Dose point coordinate Y:

0.0 0.0

.0 Dose point coordinate Z:

0.0 0.0

.0 Disk radius:

564.2 18.0 6.1 Air Gap:

100.0 3.0 3.4 Source Area: 1.00004e+6 sq cm 1076.43 sq ft.

155006, sq in.

MATERIAL DENGITIES (g/cm*3)

Material Air Gap Air 0.00122 BUILDUP Method Buildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order

-Radial 20 Circumferential 20 SOURCE NUCLIDES Nuclide curies pCi/cm2 Co 2.2501e-005 2.2500e-005

===================

RESULTS

===================

Energy Activity Energy Fluence Rate Exposure Rate In Air (MeV)-

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No Buildup With Buildup 0.6 1.358e+002 6.926e-005 7.091e-005 1.352e-007 1.384e-007 1.0 8.325e+005 7.116e-001 7.232e-001 1.312e-003 1.333e-003 1.5 8.325e+005 1.072e+000 1.084e+000 1.803e-003 1.825e-003 TOTAL:

1.665e+006 1.783e+000 1.808e+000 3.115e-003 3.158e-003 YNPS_ ERA.wpd 1-5 5/1/97

o g

• L Exposure Rates from Surfaca Activity Contamin: tion Sources

• - Exposure Rate from Disk Sources 100cm to 100,000 m in Area 2

2 MicroShield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.

Page*

'l File Ref:

DOS File:

Date:

/

/

Run Date: April 26, 1997 By:

-Run Times 12:58 p.m.' Saturday checked:

Duration:

0:00:01 Case

Title:

1000 m2 Co-60 Disk Source - Dose Rate in Air 0~im GEOMETRY 3 - Disk centimeters feet and inches Dose pojnt coordinate X:

100.0 3.0 3.4 Dose point coordinate Y:

0.0 0.0

.0 Dose point coordinate Z:

0.0 0.0

.0 Disk radius:

1784.1 58.0 6.4 Air Gap:

100.0 3.0 3.4 Source Areat. 9.99973e+6 sq cm 10763.6 sq ft.

1.54996e+6 sq in.

MATERIAL DENSITIES (g/cm*3)

Material Air Gap Air 0.00122 BUILDUP Method: Buildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order Radial 20 Circumferential 20 SOURCE NUCLIDES Huclide curies pCi/cm2 CD-60 2.2499e-004 2.2500e-005

===================

RESULTS

=a========n========

Energy Activity Energy Fluence Rate Erposure Rate In Air (MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No Buildup With Buildup 0.6 1.358e+003 1.110e-004 1.167e-004 2.167e-007 2.278e-007 1.0 8.325e+006 1.148e+000 1.188e+000 2.115e-003 2.189e-003 1.5 8.325e+006 1.736e+000 1.780e+000 2.920e-003 2.996e-003 TOTAL:

1.665e+007 2.883e+000 L.968e+000 5.036e-003 5.185e-003 YNPS_ ERA.wpd 1-6 5/1/97

_u

~

Exposure Rates from Surfcco Activity Contcmin tion Sourcss

" Exposure Rate from Disk Sources 100cm to 100,000 m'in Area 2

MicroShield 4.00 -

Serial (4.00-00261 Bruce J. Mann P.E.

Page

'l File Ref:

DOS File:

Date:

/

/

Run Date: April 26, 1997 By:

Lan Time:

1:00 p.m. Saturday Checked:

Duration:

0:00:01 Case

Title:

10,000 m2 Co-60 Disk Source - Dose Rate in Air'S 1m GEOMETRY 3 - Disk centimeters feet and inches Dose point coordinate X:

100.0 3.0 3.4-Dose point coordinate Y:

0.0 0.0

.0 Dose point coordinate Z:

0.0 0.0

.0 Disk radius:

5641.9 185.0 1.2 Air Gap:

100.0 3.0 3.4 Source Area: 1.e+8 sq cm 107639. sq'ft.

1.55001e+7 sq in.

MATERIAL DENS 7. TIES (g/cm*3)

Material Air Gap Air 0.00122 BUILDUP Method: Buildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order Radial 20 Circumferential 20 SOURCE NUCLIDES Nuclide curies pCi/cm*

Co-60 2.2500e-003 2.2500e-005

===================

RESULTS

===================

Energy Activity Energy Fluence Rate Exposure Rate In Air (MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No Buildup With Buildup 0.6 1.358e+004 1.449e-004 1.619e-004 2.828e-007 3.159e-007 1.0 8.325e+007 1.518e+000 1.638e+000 2.798e-003 3.020e-003 1.5 8.325e+007 2.318e+000 2.454e+000 3.899e-003 4.129e-003 TOTAL:

1.665e+008 3.836e+000 4.093e+000 6.697e-003 7.150e-003 YNPS_ ERA.wpd 1-7 S/1/97

.c Exposure Rates from Surface Activity C':ntamination Sourc':0

- Exposure Rate from Disk Sources 100cm to 100,000 m in Area 2

2 Microshield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.

PCge,

.1 Pile Ref:

DOS File Date:

/

/

Run Date April 26, 1997 By:

Run Time:

4:13 p.m. Saturday Checked:

Duration:

0:00:01 Case

Title:

100,000 m2 Co-60 Disk Source - Dose Rate in air 6 la

' GEOMETRY 3 - Disk centimet+rs feet and inches Dose point coordinate X:

100.0 3.0 3.4

-Dose point coordinate Y:

0.0 0.0

.0 Dose point coordinate Z:

0.0 0.0

.0 Disk radius:

17841.2 585.0 4.1 Air Gaps 100.0 3.0 3.4 Source Area: 9.99995e+8 sq cm 1.07639e+6 sq ft.

1.55e+8 sq in.

MATERIAL DENSITIES (g/cm*3)

Air 0.00122 1

l l

BUILDUP Method: Buildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order Radial 20 Circumfereatial 20 SOURCE NUCLIDES Nuclide curies pCi/cm a C3-60 2.2500e-002 2.2500e-005

===================

RESULTS

===================

Energy Activity Energy Fluence Rate Exposure Rate In Air (MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No Buildup With Buildup 0.6 1.358e+005 1.638e-004 2.027e-004 3.197e-007 3.956e-007 1.0 8.325e+008 1.750e+000 2.040e+000 3.226e-003 3.761e-003 1.5 8.325e+008 2.716e+000 3.056e+000 4.569e-003 5.141e-003 TOTAL:

1.665e+009 4.460e+000 5.096e+000 7.795e-003 8.902e-003 YNPS_ ERA.wpd 1-8 5/1/97

• a Exposure Rat:s from Surface Activity Contamination Sourc:a

• - Exposure Rate from Rectangular Surface Sources MicroShield 4.00 -

Serial #4.00-00261 4

Gruce J. Mann P.E.

- Page -

.:*1 File Ref: fa moren I DOS File:

Date:

/

/

Run Date: April 11, 1997 By:

Run Time: 10:00 a.m. Friday Checked:

Duration:

0:00:03 Case

Title:

Rectangular Surface Source 10x10m dose pt-6 1 m from center GEOMETRY 4 - Vertical Rectangular Area centimeters feet and inches Dose point coordinate X:

100.0 3.0 3.4 Dose point coordinate Y:

500.0 16.0 4.9 Dose point coordinate 2 500.0 16.0 4.9 Rectangular area height:

1000.0

-32.0 9.7

)

Rectangular area width:

1000.0 32.0 9.7 Air Gap:

100.0 3.0 3.4 Source Area: 1000000 sq cm 1076.39 sq ft.

155000. sq in.

MATERIAL DENSITIES (g/cm'3)

Material Air Gap

-Air 0.00122 i

BUILDUP Method: Buildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order Z-Direction.

20 Y Direction 20-SOURCE NUCLIDES Nuclide_

_ _ curies pCi/cm2 Co-60 2.2500e-005 2.2500e-005

=============================== RESULTS

===================

Energy Activity Energy Fluence Rate Exposure Rate In Air

-(MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup -No Buildup With Buildup 0.G 1.358e+002 6.884e-005 7.048e-005 1.344e-007 1.376e-007 1.0 B.325e+005-7.073e-001 7.188e-001 1.304e-003 1.325e-003 1.5 8.325e+005 1.065e+000 1.078e+000 1.792e-003 1.813e-003 TOTAL:

1.665e+006 1.772e+000 1.797e+000 3.096e-003 3.138e-003 YNPS_ ERA.wpd 2-1 5/1/97

Exposure Rates from Surfac] Activity Contamination Sources

• - Exposure Rate from Rectangular Surface Sources MicroShield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.

Page'

.: '1 File Ref: S ta r o, s o I DOS File:

Date:

/

/

Run Date: April 11, 1997 By:

Run Time: 10:21 a.m. Friday Checked:

Duration:

0:00:03 Case

Title:

Rect Surf Sourcc 10x2 m dose pt 9 Sm fr center (wall source)

GEOMETRY 4 - Vertical Rectangular Area centimeters feet and inches Dose point coordinate X:

500.0 16.0 4.9 Dose point coordinate Y:

100.0 3.0 3.4 t

Dose point coordinate Z:

500.0 16.0 4.9 Rectangular area height:

200.0 6.0 6.7 Rectangular area width:

1000.0 32.0 9.7 Air Gap:

500.0 16.0 4.9 Source Area: 200000 sq cm 215.278 sq ft.

31000.1 sq in.

MATERIAL DENSITIES (g/cm*3)

Air 0.00122 BUILDUP Method: Buildup Factor Tables The material reference is Air Gap' INTEGRATION PARAMETERS Quadrature Order Z Direction 20 Y Direction 20 SOURCE NUCLIDES Nuclide curies pCi/cm2 Co-60 4.5000e-006 2.2500e-005

=============================== RESULTS

===================

Energy Activity Energy Fluence Rate Exposure Rate J% Air (MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No Buildup With Buildup 0.6 2.716e+001 3.813e-006 4.006e-006 7.443e-009 7.819e-009 1.0 1.665e+005 3.942e-002 4.077e-002 7.266e-005 7.515e-005 1.5 1.665e+005 5.961e-002 6.112e-002 1.003e-004 1.028e-004 TOTAL:

3.330e+005 9.903e-002 1.019e-001 1.730e-004 1.780e-004 YNPS_ ERA.wpd 2-2 5/1/97 0

G. * #

Exposure Rat:s from Surface Activity Contamin: tion Sourc:s - Exposure Rate from Rectangular Surface Sources Microshield 4.00 -

Serial #4.00-00261 Bruce J. Mann P. E. -

P0ge "

"1_

File Ref: Ice wa.i e 2.

DOS File:

Dater-

/

/

Run Date:-April 11,'1997 By:

RunLTime: 11:33 a.m. Friday Checked:

Duration:

0:00:03

' Case,

Title:

Rect Surf Source 10x10 m dose pt 9 la fr cor (floor source)

GEOMETRY 4 - Vertical Rectangular Area

. centimeters feet and inches Dose-point coordinate X:

100.0 3.0 3.4 Dose point coordinate Y:

100.0 3.0-3.4 Dose point coordinate Z:

100.0 3.0 3.4 Rectangular area height:

1000.0 32.0 9.7 Rectangular area width:

1000.0 32.0 9.7 Air Gap:

100.0 3.0 3.4 Source Area: 1000000 sq cm-1076.39 sq ft.

155000._sq in.

I i

MATERIAL DENSITIES-(g/ca'3)

Material

_ Air Gap-

' Air-0.00122 BUILDUP ~

Method: Buildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order Z Direction ~

2 0 '

Y Direction 20-SOURCE NUCLIDES Nuclide-curies pCi/cm2 Co-60.

2.2500e-005-2.2500e-005

===================

RESULTS

===================

Energy Activity Energy Fluence Rate Exposure Rate In Air (MeV)-

'(photons /sec ) _ No Buildup With BuildupNo Buildup With Buildup (MeV/sq cm/sec)

(mR/hr) 0.6:

1.358e+002 4.293e-005 4.407e-005 8.380e-008 S.602e-008 1.0 8.325e+005 4.414e-001 4.494e-001 8.135e-004 8.283e-004 1.5 8.325e+005 6.649e-001 6.738e-001 1.119e-003.

1.134e-003 TOTAL:

.1.665e+006 1.106e+000 1.123e+000 1.932e-003 1.962e-003 YNPS_ ERA.wpd -

2-3 5/1/97

Exposure Rates from Surface Activity Contamination Sources

• Exposure Rate from Rectangular Surface Sources MicroShield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.

Page -

~1 File Ref: S G.w e n o 2_

DOS File:

Date:

/

/

Run Dates April 11, 1997 By:

Run Times 10:35 a.m. Friday Checked:

Duration:

0 00:03 Case

Title:

Rect Surf Source 10x2 m dose pt 9 Im fr end (near w. source)

GEOMETRY 4 - Vertical Rectangular Area centimeters feet and inches Dose point coordinate X:

100.0 3.0 3.4 Dose point coordinate Y:

100.0 3.0 3.4 Dose point coordinate 2:

100.0 3.0 3.4 Rectangular area height:

200.0 6.0 6.7 Rectangular area width:

1000.0 32.0 9.7 Air Gap:

100.0 3.0 3.4 Source Area: 200000 sq cm 215.278 sq ft.

31000.1 sq in.

MATERIAL DENSITIES (g/cm*3) l Air 0.00122 BUILDUP Method: Buildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order Z Direction 20 Y Direction 20 SOURCE NUCLIDES Nuclide curies pCi/cm2 Co-60 4.5000e-006 2.2500e-005

===================

RESULTS

===================

Energy.

Activity Energy Fluence Rate Exposure Rate In Air (MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No Buildup With Buildup 0.6 2.716e+001 2.437e-005 2.476e-005 4.756e-008 4.834e-008 1.0 1.665e+005 2.499e-001 2.527e-001 4.607e-004 4.658e-004 1.5 1.665e+005 3.759e-001 3.790e-001 65324e-004 6.376e-004 TOTAL:

3.330e+005 6.258e-001 6.317e-001 1.093e-003 1.103e-003 YNPS_ ERA.wpd 2-4 5/1/97 I

a..-

i' Exposure Rit:s from Surface Activity Contamination Sourc:s

• - Exposure Rate from Rectangular Surface Sources MicroShield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.

+

P0ge

- 1 File Ref: f(a m <?o L DOS Files:

Date:

/

/

Run Dat.e: April 11, 1997

_ By:

Run Time: 10:38 a.m. Friday Checkedt Duration:

0:00:03 Case

Title:

Rect Surf Source 10x2 m dose pt 0 92 fr end (far W. source)

GEOMETRY 4 - Vertical Rectangular Area centimeters feet and inches Dose point coordinate X:

900.0 29.0 6.3 Dose point coordinate Y:

100.0 3.0 3.4 Dose-point coordinate Z:

100.0 3.0 3.4 Rectangular area height:

200.0 5.0 6.7

-Rectangular area width:

1000.0 r,u 9.7 Air Gap:

900.0

.0 6.3 Source Area: 200000 sq cm 215.278 sq ft.

31000.1 sq in.

i MATERIAL DENSITIES (g/cm"3)

Material Air Gap Air 0.00122 BUILDUP Method: Buildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order Z Direction 20 Y Direction 20 SOURCE NUCLIDES Nuclide curies pCi/cm3

- C2-60 4.5000e-006 2.2500e-005

===================

RESULTS

===================

Energy. (photons /sec )

(MeV/sq cm/sec)

(mR/hr)

Activity Energy Fluence Rate Exposure Rate In Air (MeV)

No Buildup With Buildup No Buildup With Buildup 0.6 2.716e+001 1.167e-006 1.273e-006 2.277e-009 2.484e-009 1.0 1.665e+005 1.217e-002 1.291e-002 2.243e-005 2.381e-005 1.5 1.665e+005 1.852e-002 1.935e-002 3.115e-005 3.256e-005 TOTAL:

3.330e+005 3.068e-002 3.227e-002 5.358e-005 5.637e-005 YNPS_ ERA.wpd 2-5 5/1/97 f

p.'

Expo:ure Rates from Surface Activity Cont: min:ti:n Sourc:s

• - Exposure Rate from Rectangular Surface Sources MicroShield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.-

P ge

.1 File Ref: 8cre o. o 2 DOS File:

Date:

/

/

Run Date: April 11, 1997 By:

Run Tims: 11:52 a.m. Friday Checked:

Duration:

0:00:03 Case

Title:

Rect Surf Source 46x22 m dose pt 9 la fr ctr (floor source)

GEOMETRY 4 - Vertical Rectangular Area centimeters feet and inches Dose point coordinate X:

100.0 3.0 3.4 Dose point coordinate Y:

1100.0 36.0 1.1 Dose point coordinato Z:

2300.0 75.0 5.5 Rectangular area height:

2200.0 72.0 2.1 Rectangular area width:

4600.0 150.0 11.0 Air Gap:

100.0 3.0 3.4 Source Area: 10120000 sq cm 10893.1 sq ft.

1.5686e+6 sq in.

MATERIAL DENSITIES (g/cm*3)

Material Air Gap Air 0.00122 DUILDUP Method: Buildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order Z Direction 20 Y Direction 20 SOURCE NUCLIDES Nuclide curies pC1/cm2 Co-60 2.2770e-004 2.2500e-005 RESULTS

===================

Energy

' Activity.

Energy Fluence Rate Exposure Rate In Air (MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup-With Buildup No Buildup With Buildup 0.6 1.374e+003 9.687e-005 1.023e-004 1.891e-007 1.996e-007 1.0 8.425e+006 1.002e+000 1.040e+000 1.848e-003 1.918e-003 1.5 8.425e+006 1.517e+000 1.559e+000 2.552e-003 2.624e-003 7

TCTAL:

1.685e+007 2.519e+000 2.600e+000 4.400e-003 E542e-003 YNPS_ ERA.wpd 2-6 5/1/97

.g Expo:ure Rates from Surface Activity Contamination Sourc:s

,. Exposure Rate from Rectangular Surface Sources MicroShield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.

Page

1 File Ref: fcn n., e 3 DOS File:'

Date:

/

/

Run Date April 11, 1997 By:

Run Time:

2:11 p.m. Friday Checked:

Duration:

0:00:03 Case

Title:

Rect Surf Source 46x2 m dose point S lim fr ctr (side wall)

GEOMETRY 4 - Vertical Rectangular Area centimeters feet and inches Dose F,lnt coordinate X:

1100.0 36.0 1.1 Dose point coordinate Y:

100.0 3.0 3.4 Dose point coordinate Z:

2300.0 75.0 5.5 Rectangular area height:

200.0 6.0 6.7 Rectangular area width:

4600.0 150.0 11.0 Air Gap:

1100.0 36.0 1.1 Source Area 920000 sq cm 990.28 sq ft.

142600. sq in.

MATERIAL DENSITIES (g/cm*3)

Material Air Gap t

Air 0.00122 BUILDUP Method: Buildup Factor Tables The material reference is Ait Gap r

INTEGRATION PARAMETERS Quadrature Order Z Direction 20 Y Direction 20 SOURCE NUCLIDES Nuclide curies

1. Ci/cm3 Co-60 2.0700e-005-- 2.2500e-005

===================

RESULTS

===================

Energy Activity Energy Fluence Rate Exposure Rate In Air (MeV)-

-(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup ~With Buildup No Buildup With Buildup 0.6 1.249e+002 2.297e-006 2.605e-006 4.483e-009 5.086e-009

-1.0 7.659e+005 2.417e-002 2.635e-002 4.456e-005 4.858e-005 1.5 7.659e+005 3.702e-002 3.947e-002 6.229e-005 6.641e-005 9

AL:

1.532e+006 6.120e-002 6.583e-002 1.069e-004 1.150e-004 YNPS_ ERA.wpd 2-7 5/1/97 l

.J

Exposure Rat:s from Surface Activity Contamination Sourc:s

' - Exposure Rate tiom Rectangular Surface Sources MicroShield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.

Page

1 File Ref:Sc uo <. o 2 DOS File:

Date:

/

/

Run Date April 11, 1997 By:

Run Time:

2:16 p.m. Friday checked:

Duration:

0:00:03 Case

Title:

Rect Surf Source 22x2 m dose point 9 23m fr ctr (and wall)

GEOMETRY 4 - Vertical Rectangular Area centimeters feet and inches Dose point coordinate X:

2300.0 75.0 5.5 Dose point coordinate Y:

100.0 3.0 3.4 Dose point coordinate Z:

2300.0 75.0 5.5 Rectangular area height:

200.0 6.0 6.7 Rectangular area width:

2200.0 72.0 2.1 Air Gap:

2300.0 75.0 5.5 Source Area: 440000 sq cm 473.612 sq ft.

68200.1 sq in.

MATERIAL DENSITIES (g/cm*3)

Material Air Gap Air 0.00122 BUILDUP Method: Beildup Factor Tables The material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order 2 Direction 20 Y Direction 20 SOURCE NUCLIDES Nuclide curies pC1/cm2 Co-60

.4.7348e-006 1.0761e-005

===================

RESULTS

================w==

Energy Activity Energy Fluence Rate Exposure Rate in Air (MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No Buildup With Buildup 0.6 2.858e+001 1.550e-007 1.944e-007 3.025e-010 3.794e-010 1.0 1.752e+005 1.671e-003 1.951e-003 3.080e-006 3.596e-006 1.5 1.752e+005 2.601e-003 2.918e-003 4.377e-006 4.910e-006 TOTAL:

3.504e+005 4.272e-003 4.B69e-003 7.457e-006 8.506e-006 YNPS_ ERA.wpd 2-8 5/1/97 J

Exposure Rates from Surface Activity C:ntaminati:n Sourc:s l

' Attachment 2 Exposure Rate from Rectangular Surface Soure:s L.

Microshield 4.00 -

Serial #4.00-00261 Bruce J. Mann P.E.

Page '

'l DOS File:

File Raft.Sc % e,.s'l Dates

/

/

Run Date April 11, 1997 By:

Run Times 2:40 p.m. Friday.

Checked:

Duration:

0:00:03 Case

Title:

Rect Surf Source 46x2 m dose point 9 11a fr ctr (side wall)

GEOMETRY 4 - Vertical Rectangular Area centimeters feet and inches Dose point coordinate X:

^300.0 75.0 5.5 Dose point coordinate Y:

00.0 3.0 3.4 Dose point coordinate 2 J00.0 75.0 5.5 Rectangular area height

200.0 6.0 6.7 Rectangular area width:

2200.0 72.0 2.1 0

Air Gaps 2300.0 75.0 5.5 Source Area: 440000 sq cm-473.612 sq ft.

68200.1 sq in.

Material Air Gap Air 0.00122 BUILDUP P e thod: Buildup Factor Tables Thu material reference is Air Gap INTEGRATION PARAMETERS Quadrature Order Z Direction 20 Y Direction 20 SOURCE NUCLIDES Nuclide curies

-pCi/cm2 Nuclide curies pCi/cm2 Ba-137m 4.0612e-007 9.2300e-007 Co-60 9.3280e-007 2.1200e-006 Fe-55 6.5560e-006 1.4900e-005 Ni-63 1.8832e-006-4.2800e-006 Sr-90 9.9000e-008 2.2500e-007

=============================== RESULTS

-======

-==

Energy-Activity Energy Fluence Rate Exposure Rate In Air (MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No Buildup With Buildup No Buildup With Buildup 0.6 1.353e+004 7.336e-005 9.202e-005 1.432e-007 1.796e-007 1.0 3.451e+004 3.291e-004 3.843e-004 6.067e-007 7.084e-007 1.5 3.451e+004 5.125e-004 5.749e-004 8.623e-007 9.673e-007 TOTAL:

8.255e+004 9.150e-004 1.051e-003 1.612e-006 1.855e-006 YNPS_ ERA.wpd 2-9 5/1/97 1

J

t.

.1

• Exposure R tes from Surfaco Activity Contamination Sources

• - Exposure Rate from Rectangular Surface Sources e

MicroShield 4.00 -

Serial #4.00-00261 Bruce J. I'snn P.E.

DOS Filer.

Date

/

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Run Date -April 11,--1997 Byt-

'Run' Times 12:34 p.m. Friday Checked:

Duration:

0:00:03 Case

Title:

Rect--Surf Source 46x22 m dose pt 4 la fr'ctr (floor source).

GEOMETRY 4 - Vertical Rectangular Area centimeters feet and inches Dose point coordinate X:

100.0 3.0 3.4 Dose point coordinate Y:

1100.0 36.0

-1.1-Dose point coordinate-2 Rectangular area height: _

2300.0 75.0 5.5 2200.0 72.0

- 2.1-Rectangular area width:

4600.0 150.0 11.0-Air Gap:

100.0 3.0 3.4 Source-Arca: 10120000 sq cm 10893.1 sq ft.

1.5686e+6 sq in.

MATERIAL. DE!'3ITIES (g/cm*3)

Material Air Gap Air-0.00122 BUILDUP Method:.fiulldup Factor Tables The material reference-is Air Gap L

h' INTEGRATION PARAMETERS Quadrature order Z Direction 20 Y Direction 20 SOURCE NUCLIDES Nuclide' curies =-

pCi/cm8 Nuclide curies pCi/cm*-

Ba-137m 9.34C8e-006 9.2300e-007-Co-60 2.1454e-005 2.1200e-006 Fe-55 1.5079e-004 1.4900e-005 Ni-63 4.3314e-005 4.2800e-006 Sr-90 2.2770s-006 2.2500e-007

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RESULTS

==

Energy

-Activity Energy Fluence Rate Exposure Rate In Air.

-(MeV)

(photons /sec )

(MeV/sq cm/sec)

(mR/hr)

No. Buildup With Buildup No. Buildup With Buildup 0.6 3.111e+005 2.193e-002 2.315e-002 4.280s-005 4.519e-005 1.0 7.938e+005 9.445e-002 9.802e-002 1.741e-004 1.8n7e-004 1.5 7.938e+005 1.429e-001 1.469e-001 2.405e-004 2.472e-004 TOTAL:

1.899e+006 2.593e-001 2.681e-001 4.574e-004 4.731e-004 YNPS_ ERA.wpd 2-10 5/1/97

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