ML20094N297

Suppl to Seabrook Station Semiannual Radioactive Effluent Release Rept,Radiological Impact Assessment,1991

ML20094N297
Person / Time
Site:	Seabrook
Issue date:	12/31/1991
From:	PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:
Shared Package
ML20094N296	List: ML20094N293 ML20094N297
References
NUDOCS 9204060281
Download: ML20094N297 (14)

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. Seabrook Station ,

Supplemental Effluent Releae9 Report

.Radiologict1 impact-Assessmen: For 1991-I. Introduction Dosee resulting from liquid and gaseous effluents from Seabrook Station during 1991 were calculated in accordance with Method II as cefined in the Seabrook Of fsite Dose Ca hlation Manual (ODCM) . The calculational methods used -

- follow the models in Regulatory Guide 1.109. The calculations incladed maximum i

total body' doses and organ doses from all liquid releases, maximwn offsite organ doses resulting from airborne iodines, tritium and particulate radionuclidw. ,

and maximum off site beta air and- garrma -air doses from airborne nuble gasen. In addition, the doses were also calculated for the special receptoc .locatic

-inside_the site boundary: the Educauon Center and the " Rocks' . The airborne ettluert doses presented _ Jn Table A are the sunuation of elevated and ground ,

releases.

- T1.e calculated maximum annual total- body dose and. the maximum organ dose-from ligula effluents represent, respectively, 0.02I and 0.04% of the dose limits 4 - establie. hec hv Technical Specification. 3.11.1.2. The calculated annual maximum dose f rom airborne iodine, tritium and particulate radiouuclides for offsite ,

receptor locations represents 0.02% of the dose- limit established by Technical- ,

Specification 3.11.2.3, whereas the calculated msximum annual beta sir and gamma t.

ie ' air doses from airborne noble gases for offsite rect.ptor locations represent, raspectively. 0.012.and 0.04% of- the dose limits established by Technical -

Specification 3.11.2.2. - The :alculated annual beta air and gamne air doses f rom ,

airborne noble gases for the Education CeMer were, respectively, IE-3% and 2E-32 of 1the limits in Technical Specification 3.11.2.2, whereas, for- the ' Rocks' the

-anntal dosen were 0.42 for both Technical Specification limits. The calculated il 9204060281 720327 PDR- ADOCK 05000443 R- pop

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annual doses from airborne lodines, tritium and particulate radienuclides at the Education Center and the ' Rocks" werc, respectively. 1E-5% and 9E -42 of the

-limits in Techt.lcel Specification 3.11.2.3.

The stun of the maximum whole body doses from all exposure patt.<ays for the liquid and gaseous ef fluents , pit'.s the direcs whole body dose from station operation, was 5.9E-03 mrem to a hypothetice! Andiiidual. This total whole body dose conservatively represents 0.02% of the . hole body dore limit for a member i

of the public as set forth in 40CFR190, and demonstrates compliance with that code.

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II, Method for Calculating the Total Body and Maxircu's Organ Doses Resultine. from Liquid Releases The computer code: IDL.E,- which is consistent with the models in Regulatory cuide 1,109 (Reference 1), was used to calculate the total body and organ! doses resulting from liquid effluents from Seabrook Station. *1he general equatioas A-3, A-4, A,5, A-6 and A-7 from Regulatory Guide 1.109 are applied in IDLE. The total body doses and the organ doses-are evaluated for each of the four age groups - (i .e. , infant, child, teen and adult) to determine the maximum tot.1 body doso and maximum organ dose via all existing exposure pathways (i.e., fish and-aquatic. ; invertebrate inge;,t ion, and shorelino exposure) to an age-dependent individual. The values for the various factors . considered in equations A-3 1

l- through A 7 have been taken from Regulatory Guids 1,109 and the Seabrook Station i

Offsite Dose Calculation Manual (ODCM) (Reference 2) . The specific values used for the usage factor _(U,p), mixing ratio (M p), bioaccumulation factor. (B3p), dose j ;_ . factors (D,3g), transit time (t ),p trcusfer constant from water to sediment (Kc ),

l E exposure time for sediment or so;l (ed), anzi shora. width factor (W) arc providad by the refereace sources as rummarized in Table B. The flow rate of the liquid l 4

l effluent. (F) and the release ratea for radionucli, des (Qt) are measured

'specifically prior to each _ liquid release. Tnn "alues for half lives for radionuclides (T ) and their radioactive decay constants (k) have been taken i

( _from Kocher (Reference 3).

l L The exposure pathways considered in the calculations of total body and maximum organ doses resulting from liquid discharges from Seabrook Station have L been limited to 'ngestion of aquatic foods and exposure to shom line deposits.-

1The doce calculations-do not include the ingestion of potable water and Irrigated

, vegetation as potential exposure pathways because the liquid effluents from the L plant are discharged into salt water.

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Table A-list the calculated .11guld pathway doses for each calendar quarter .

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.III, litthod for Calculating _ the ~ Gamma and Beta Air Dosos f roq Noble Gagn i

The imputer codes AIRAD and AEOL 2 (hd 05) were used for the calculation of both the gamma ar.d beta air doses resulting from noble gases present in gaseous effluents released from Seabrook Station. The features and use of AEOLUS

. 2 (Mod 04) for the calculation of atmospheric df spersion factors (i.e., Cht/Q.

factors)- from recorded- meteorological- data (i.e., meteorologicci data

-measurements taken~during the time of the release) are described in section i B.7.3.2 of Seabrook's ODCM. Meteorological dispersion factors concurrent with i

per ods of batch gas releases are calculated along with the values for quarterly cverage dispersion factors. The atmospheric dispersion factors ,:alculated using AEOLUS 2 (Mod 04) wers. in turn, used in the gamma and beta air dot.e calculations -

by AIRAD. AIRAD is consistent with the models presented in Regulatory Guide 1.109, general equations B-4 and B S. The values for the doce factors. DF! and DFo have been taken from Table B-1 in Regulatory Guide 1.109 Table A list the calculated air doses for each calendar quarter, and the total for the year.

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IV, Method for Calculatinv the Critical. Organ Dose Resulting from lodines,

. Tritium fmilarticularg1.wlt.,hlmAater thart) Days in Casenus Rele ases

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The computer codes AEOLUS 2 (Med 04) and ATMODOS vere used for the i

calculation-of the organ doses resulting from iodines, tritium ~and particulates with half lives greater than 8 days present in gaseous effluents roleused from

. Seabrook Station, The features and use of AEOLUS 2 (Mod 04) for the calculation I cf atmospheric dispersion factors (i.e., Chi /Q facrors) from recordti

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meteorologica1' iata (1.e. ., meteorological data measurements taken during the titre of. the release) .are described in section B 7.3.2 of Seabrook's ODCM.

. Meteorological dispersion factors concurrent with periods of batch gas releases '

were calculated along with the values for quarterly average dispersion factors.

The-atmospheric dispersion factors calculated using AEOLUS 2 (Mod 04) were, in turn, used in the dose calculations by ATMODOS. ATMODOS calculates the organ

- doses ( i.e., dose to bone, liver, kidney, lung, lown large intestino, total body, and skin) due to the presence of radionuelf des other than noble gases in gaseous effluents, and is consistent with the models presented in Appendix C of Regulatory Guide 1.109. The pathways considered in the dose calculations are the

ground plane, inhalation, and ~ ingestion of stored vegetables, fresh gardt.n ver,e tables , milk and meat. The critical organ dose in determined'for the offsite

. location (e.g. , site boundary, nearest resident or farm) of receptor pathways as identified in- the mo s,t recent annual land use census. The total body dose contributions via . the ground plene and inhalation pathways as calculated by D

ATMODOS have also been included in the total body dose estiraatos for the special receptor locations- inside the site boundary. Equations C-1 through C-13 -are

, - applied in the ATMODOS calculation:of the critical organ dnses. The input-data and . as sump tions are those - provided -in Appendix C of Regulatory Guide 1.109, except where site speelfic--data and assumptions have been' identified in Tables w v- - - - - - --v-- e s --- , - - , - - - - s

B.7-2 and B.7-3 of Seabrook's ODC". These two ODCM tables provide the options for special conditions, depending on the type of receptor being evaluated at a-I specific location, that are to be applied in Method 11 calculations. The receptor type controls the exposure pathways for calculational purposes. The receptor types used ,a the dose calc 1ations were a resident receptor (which considered the ground pl:ne, inhalation and vegetable ingestion exposure pathways), a milk receptor (which considered the ground plane, inhalation, vegetable aad milk ingestion exposure pathways) and a boundary and radius receptor (both of which considered the ground p1r:ne atid inhal a t ion exposure pathways). The resident and allk receptor locations for the various sector were based on the 1991 land use census data for Seabrook Station (see Table D for the latest land use census) . The radius receptor locations were applied at several distances in each sector to insure that the location of the maximum doses were a

not overlooked.

Depletion of the p une during transport is considere 3 by AEOLUS 2 (Mad 04) in the calculations of atmospheric dispersion factors (e.g., calculation of

! X/Q } D) . A shielding f actor (Sr) of 0.7 is applied for residential structures.

The aurce for the values of the various factors used in equations C-1 through C 13 are summart::ed in Tablo C.

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V. keferencu-

1. ' Calculat ion of ' Annual Doses to Man f rom : Routine Raleases of Reactor Effluents for ' tho' Purposes of Evaluating Compliance with 10CFR Part 50, Appendix I, Reg. Guide .l.109. Rav -1, Oct. 1977.

2.. Seabrook Station Offsite Doso Calculation Manual.

3. Kocher, D.C., Dose Rate Conversion Facters f c.e Exposure to Photons and Electrons, Health Physics, Vol. 45, Nn. 3, Sept. 1983.

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TABLE A l.<

Sackraok Statiot}:

Effluent and Liste Disoesal Semiarnual Renot.t; 1991 l~ Maxirtum(*)Of f-Site pog_es and Dose Commi tmenta_t;ph.gbe ty ",,.t;he Public Dose (mre W 8' l

l 1st 2 tid 3rd 4th l~ - Sourco Quarter Ouarter Ouar.ter Ouarter Yearn ._

Liquid Effluents:

Total Body Dose -3.3e 4.le-05 2.le-04 3.7e-04 6.Se 04'

. Organ Dose 1.9e 04 1.Se 1.3e-03 2.2e-03 3.9e-03 (1) (1) .(1) (1)

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Airborne. Effluents:

Jodines. Tritfum-and. 1.2e-07 6.6e-04 -1.50 03 8.8e-04 3.0e 03 L Particulates (2) (3) (4) (5) t

. -Noble Gases. Be t.a ' Air 1.9e-03 3.3e-05 6.7e-33 2 3e-04 2.2e 03 (arad) .(6) -(7) (8) (9)

L Gamma Air 2. if e - 0 3. 6.5e-05 7.9e-GS 8.4e-04 3.8e-3

.(mrad) t6) (7) (10) (9) boses (mrem) at Receptor Locstions Inside Site ZioundaryM; l- .. .

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3.2e-05 l'.3e-04 2.5c-03 1.9e-04

l. Ga:cma . Air Dose (mrad) ---

6.6e-05 1.0e-04 4.9e-05 2.2e-04 Organ. Dose (mrem) 7.4e 12 4.3e-07 5.5e-07 5.4e-07 1. 5m 06 (11) (11) (12) (131-

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The'" Rocks"

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Beta Air Dose f. mrad) 6.6e 02 1.3e-03 5.7e 05 8.7e-03 7.5e 02 Camma Air: Dose (mrad)' 3.le 02 9.9e-04 2_Ee 05 5.6e 03 3.8e 02 Ocgan Dose.(mtem)-

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2.5e-08 1.3e-05. 1.le-04 1.7e-05' l.4e-04 (11) (11). (13)- (11)

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1 TABLFJ (continued):

2.tabropk-Station DLtot 'and 1]Jsl e Disnosal .Se Qannt.d, hod 1991 Maxirn pWOff-Site Dosep_gpd Dose Cc':mitments to Members of the Pullic.

A

_ .Dosf .{E tM % _

1st 2nd 3rd 4th

-Scurce Ouartor- Ouarter Quarter Ouarter Yearn ,

Direct Dose From Plant OperationW 0 (a) " Maximum" means the largest iraction of corresponding 10CFR50, Appendix I, dose design

- obj ec tive .

(b) Ihe numbered footnotes indicate the aSe group, organ, and location >f the dose

,_ receptor, where appropriata.

l (1) Adult /GI LLI. .

(f) USW 914 meters.

. (2) Child /whole budy, SE-2414 r. .sters. (9) SSE-914 meters.

(3) Child /whole body, SW-966 meters. (10) W-914 noters. ,

(4) Child / thyroid, ' W-966 meters . (11) Teen /whole body.

(5) Child /GI- 1.LI, S-#6 me ters. (12) Teen / thyroid. '

(6) NNW-914~ meters. (13) Teen / lung.

_(7) ENE-2276 meters. ,

h (c) ' Max'aum" : dose for elm year is the sum of the maximum doses for each quarter This r.esults in a conservative yearly doso estimate, but still well within the limits of-

-10CFR50.

I-GI){ For cach: sp,cial receptor location, the whole body and organ doses calculated for the airoorne effluent releases were adjusted by the occupancy factor provided in:Seabrt.ok's 4

0DCM (i.e., 0.0014 for t.he Educatioa Center and 0.0076 for the." Rocks")

(e) Only station sources are considered since there are no other facilities within five L- miles-of Seabrook Station. 1991 data for the closest off-rite environmental- TLD

locations in each sector (as listed in Table B.4-l' of Seabrook's' 0DCM) were compared to I -- Epre-operation data from;1906-1988 tor the same locations . No statistical difference which could be attributed to station sources was identified.

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- - Table B Sources of the Values of Faitors Used in Liquid Dose Equations l-Factor Source 3 U.y Table B 7 1, Seabrook ODCM lg Section D.7.1, Seabrook ODCM (value-0.1 for finfish and 0.04 for shcroline) l B ip Table-A-1, Reg. Guide 1.109 D tp3 Tables E-11 through E-14, R.G. 1.109 t

, l tp Sectton E.7.1, Seetrook Okt.4 Xe Reg. Guide 1.109 -

t3 Reg. Cuice.l.109 W Table A*2, Reg. Guide 1.109 (value-0.5) l .

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Table C

- Sources of Values for the Factors Used in Dose Equations for Gaseous Releases Factor Source  ;

t3 Reg. Guide 1.109

.h Kocher (Reference 3) i DFG u Tchie E-6, Reg. Guide 1.109

[X/Q)D Calculated by AEOLUS 2 (Mod 4)

R. Table B.7 3, Seabrook ODCM ,

DFAgo Tables E-7 through E-10, R.G,1,109

• di Reg. Guide 1.3 09

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and Yv. Table B.7-2, Seabrook ODCM

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r Table E-15, Reg. Guide-1.109 J B iy Table E-1, Reg. Guide 1.109 p Reg. Guide 1.109 H. Table B.*/-2,;Seabrook ODCM

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F, - Tables E-1 and E-2,'R.U. 1.109 Qr. Table E-3, Reg. Guide 1.109 tr Reg, Guide _1.'109 l

d N 'f_ p Table B.7 2, Seabrook ODCM

f. Table B 7-2, Seabrook ODCM Fr . Table E 1, Reg. Guide 1,109 t, Table _E-15,' Reg. Guide 1.109 ..

DFI y, Tab.les E-11 through E-14, R.G.I.109 i

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l Table C

-Sources of. Values-for the Factors Used in Dose Equations for Gaseous-Releases ,

(continued)

Factor Source U!,US Table B.7 3, Seabrook ODCM I UJ,U[ Table B.7-3, Seabrook ODCM I,

f ,fy Reg. Guido 1.109 di Calculated by AEOLUS 2 (Hod 4) h, Table E-15, Reg. Guide 1.109 Qr Table E 3, Reg. Guide 1.109 l

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s Table D ,

Receptor Locations for Seabrook Station Milk Animt' hearest- Nearest- within 5 Hi Resident Garden Radius Sector mile (km) -alle (kto) Inile - (k:n) ,

-W 0.6 (1.0) 2.6 (4.2) --

'NNC 2.0-(3.2) 2.v (3.2) --

NE 1.6 (2.6) 1.6 (2.6) ---

ENE 11. 6 - ( 2. 6 ) 1.6 (2.6) --

E 1.6 /2.6) --- ---

ESE. .l.5.(2.4) --- ---

SE 1.5 (2.4) --- ---

-SSE 0.6 (1.0) 0.7 (1.1) ---

S: 0.6 (1.0) 0.8 (1,3) ---

Y SSW 0.6 (1.0) 0.8 (1.3)- - - - -

SW 0.6 (1.0) 0.8 (1.3) 3,2 (5.2)*

VSV- 'O.7 (1.1) 0.7 (1.1) ---

W 0.6 (1,0) 0,7 (1,1) ---

WNW 0.6 (1.0) 1.0-(1.6). 3.0 (4.8)5 3.8 (6.1)*

4.8 (7.7)5 NV 0.6 (1.0) 0.7 (1.1) 4.4 (7.1)5 NNW 0.7 (1.1) 0.7 (1.1) 3.4-(5.5)*

,. .c - cow;-g - goat.

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