ML19281A283
| ML19281A283 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 02/28/1979 |
| From: | CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | |
| Shared Package | |
| ML19281A279 | List: |
| References | |
| NUDOCS 7903090278 | |
| Download: ML19281A283 (10) | |
Text
.
DOCKET NO. 50-213 ATTACIDIENT '
O IIADDAM NECK PLANT REVISION TO OFFSITE DOSE CALCULATION MANUAL FEBRl'ARY, 1979
TABLE OF CONTENTS (Cont'd)
Section Page No.
Rev.
a.
Noble Gas Limit D-1 0
D-2 0
b.
Iodine & Particulate Limit D-3 0
D-4 1
Feb. 1979 2.
Specification 3.26.2.1 D-5 1
Feb. 1979 a.
Quarterly - Noble Gas Limit D-5 1
Feb. 1979 D-6 1
Feb. 1979 D-7 0
D-8 0
b.
Annual - Noble Gas Limit D-9 0
3.
Specification 3.26.3.1 D-10 0
a.
Quarterly - Iodine & Particulate Limit D-10 0
D-11 0
D-12 0
b.
Annual - Iodine & Particulate Limit D-13 0
D-14 0
4.
Specification 3.26.4.1 D-15 0
a.
Gaseous Waste Treatment System D-15 0
b.
Ventilation Releases D-16 0
5.
Guarterly Dose Calculations For Semi-Annual Report D-17 0
6.
Specification 3.26.5.1 40CFR190 Limit Calculations D-18 0
11
APPENDICES Rev.
Appendix A -
Derivation of Factors for Section C.l.a O
Appetidix B -
Derivation of Factors for Section C.I.b 0
Appendix C -
Liquid Dose Calculations - LADTAP O
Appendix D -
Derivation of Factors for Section D.1 0
Appendix E -
Gaseous Dose Calculations - GASPAR 0
Appendix F -
Derivation of Factors for Sections D.2 & D.3 1
Feb. 1979 V
Rev. 1 Feb. 1979 Step 3 - Determine D
"'*i"""
- E*"
Y#
O O
0 i i i ess than 1500 mrem /yr.
If not go to Medod D s u e
O 3.
(3) Method 3 - Use the GASPAR code - (procedure to use is given as Appendix E) to determine the maximum organ dose.
For the Special Location, enter 1.32 x 10' for the X/Q's and
-8 5.71 x 10 for the D/Q's.
See Appendix D for the difference between Method 2 and 3.
2.
Compliance With Specification 3.26.2.1 a.
Quarterly Air Dose Limit Due to Noble Gases (1) Method 1 - This method to be used until the calculated beta air dose exceeds 3 mrad.
S_tep 1 - Determine C a cu es rma sources of N
noble gases released during the calendar quarter.
Step 2 - Determine D
= quarterly air gamma dose (mrad):
QAG D
QAG N
D-4
Rev. 1 Feb. 1979 Step 3 - Determine D
- 9"^#
- Y "i#
- (*#"
QAB D
= 1.0 x 10-3
- CN [See Note 4]
QAB Step 4 - If D exceeds 3 mrad, go to Method 2.
B
[ Note 4] - See Appendix F for derivation of these factors.
(2) Method 2 - This method to be used until the calculated gamma air dose exceeds 5 mrads or the beta air dose exceeds 10 mrads.
Step 1 - Determine C. = total curies of each identified 1
noble gas nuclide i released during the quarter from all sources, both continuous and batch.
Step 2 - Determine M. = gamma air dose factor for each noble 1
gas nuclide identified above.
Values are given in Table 2.
Step 3 - Determine N. = beta air dose factor for each noble 1
gas nuclide identified above.
Values are given in Table 2.
quarterly air g mm dose (mrad):
Step 4 - Determine D
=
AG D
= 1.7 x 10-6
- 9T M. C.
[See Note 4]
QAG 1
1 1
D-5
Rev. 1 Feb. 1979 Step 5 - Determine D 9"*
Y*#
QAB D
= 1.7 x 10' N.C.
[See Note 4]
QAB 1
1 1
Step 6 - If D
> 5 mrad or D 8
QAG QAB (3) Method 3 Step 1 - Detere:ine C
^
C"#i"*
iC noble gas nuclide i released during the quarter from all continuous releases.
Step 2 - Determine C
'"#i"*
'*C iB noble gas nuclide i released during the quarter from all batch releases.
Step 3 - Determine (X/Q)CA boundary X/Q for continuous releases during the entire period for which doses are being calculated.
Call this location A.
Real time X/Q data is available from hTSCO - Environ-mental Programs Branch.
Step 4 - Determine (X/Q)BB maximum rea me she boundary X/Q for batch releases using the actual hours of batch release. Call this location B.
D-6
. Rev. 1 Feb. 1979 APPENDIX F DERIVATION OF FACTORS FOR SECTIONS D.2 & D.3 1.
Section D.2.a(1)
CY - Noble Gas Air Doses (mrad)*
(mrad)*
Gamma Beta Curies Gamma Beta mrad per mrad per Year Qtr.
Noble Gas Air Dose Air Dose Curie Curie 1976 1
128 0.0048 0.0249 3.8(-5) 1.9(-4) 2 160 0.034 0.098 2.l(-4) 6.l(-4) 3 112 0.026 0.161 2.3(-4) 1.4(-3) 4 92 0.030 0.147 3.3(-4) 1.6(-3) 1977 1
248 0.112 0.349 4.5(-4) 1.4(-3) 2 260 0.015 0.050 5.8(-5) 1.9(-4) 3 443 0.117 0.490 2.6(-4) 1.l(-3) 4 2170 0.272 0.892 1.3(-4) 4.l(-4) 1978 1
599 0.041 0.150 6.8(-5) 2.5(-4) 2 592 0.045 0.147 7.6(-5) 2.5(-4)
Avg. =
1.9(-4) 7.4(-4)
- Calculated maximum air dose (mrad) due to noble gases calculated using NRC computer code GASPAR.
Since the beta dose is always more than 2 times the gamma dose it should always be controlling.
Avg. value of gamma air dose per curie =
1.9 x 10-mrad /Ci Max. value of gamma air dose per curie = 4.5 x 10~
Ratio Max./ Avg. = 2.4 Avg. value of beta air dose per curie =
7.4 x 10-mrad /Ci Max. value of beta air dose per curie = 1.6 x 10~
Ratio max./ avg. = 2.2 Therefore, use of maximum observed values should only be a factor of two conservative on the average.
2.
Section D.2(a)(2)
Jurtification for the use of only annual average X/Q's for a.
both continuous and batch releases:
. Rev. 1 Feb. 1979 Number of hours during which batch releases were in progress durins the period 1/1/77 - 9/30/78 between the hours of:
Time
- Hours Time
- Hours 0000-0100 20 1200-1300 20 0100-0200 19 1300-1400 19 0200-0300 21 1400-1500 20 0300-0400 20 1500-1600 22 0400-0500 20 1600-1700 24 0500-0600 20 1700-1800 25 0600-0700 21 1800-1900 27 0700-0800 21 1900-2000 25 0800-0900 21 2000-2100 25 0900-1000 23 2100-2200 24 1000-1100 22 2200-2300 25 1100-1200 22 2300-2400 23 Avg. = 22 Hours Range 19-27 The above table is a compilation of 28 batches with durations ranging from 0 to 65 hours7.523148e-4 days <br />0.0181 hours <br />1.074735e-4 weeks <br />2.47325e-5 months <br />.
The table shows that the time period for batch releases is randoa when compared with time of day and thus the avg. X/Q and D/Q for batch releases should be approximately equal to the annual average X/Q's and D/Q's.
b.
Derivation of factors for D.2. (a)(2) - Method 2 (1) Step 4 Quarterly Average X/a's - Critical Site Boundary 1st Qtr. 1976-1.45x10[5 Sec./M 2nd Qtr. 1976 - 1.94 x 10
"'*!"3
-5 3rd Qtr. 1976 - 3.2 x 10
-5 "3
4th Qtr. 1976 - 3.0 x 10 1st Qtr. 1977 - 5.3 x 10 8"I"3
-5
-6 3
2nd Qtr. 1977 - 7.2 x 10
-5 3
3rd Qtr. 1977 - 2.4 x 10 4th Qtr. 1977 - 1.1 x 10
"#'!"3
-5
-6 1st Qtr. 1978 - 5.5 x 10
" "3 2nd Qtr. 1978 - 1.4 x 10
- "3
-5 3rd Qtr. 1978 - 2.0 x 10
"!"3
-5
-6 3
4th Qtr. 1978 - 8.5 x 10 Sec./M Maximum quarterly 5 average Q
served in three years = 5.3 x 10 Quarterly gamma air dose due to nuclide i D
=
QAGi Rev. 1 Feb. 1979 C. (Ci) x M. ("#
Ci) x 5.3 x 10-5,ecj,3
=
x 1
i yr 10 uC1/Ci x 3.17 x 10" (yr/sec)
(As indicated above, the same X/Q can be used for both batch and continuous releases due to the random nature of batch releases.
1.7 x 10-6 M. C.
=
DQAGr.
1 i
D
=
ver 11 nuclides = 1.7 x 10 M C QAG 1
(2) Step 5 Likewise for the beta air dose, all factors are the same except the dose conversion factor M.
should be replaced by N..
1 1.7 x 10' * [
N. C.
D
=
QAB 1
1 1
3.
Derivation of Factors for Section D 3.a(1)
From Appendix D:
-5 3
Maximum X/Q for inhalation pathway = 1.32 x 10 sec/M Maximum D/Q for food pathway = 5.71 x 10' M'
From NRC proposed tech spec (May 1978) - dose parameters are:
7 3
For I-131 - inhalation - g5g10 mrem /yr per g Ci/M For I-131 - food 1.1 x 10 m
grem/yr per p Ci/sec 3 For H inhalation - 6.g x 10' mrem /yr per f3 For H food - 2.4 x 10 mrem /yr per pCi/M For particulates the most critical nuclide is Sr-90 Assume all particulates are Sr-90.
{7 mrem /Yr per p Ci/M 3
For Sr inhalation - 4.}0 X
For Sr food - 9.5 x 10 m mrem /yr per pCi/sec Iodine and tritium are the only two nuclides which would contribute to the thyroid dose.
If another nuclide could add a significant percent to the dose, some other organ will be critical.
Iodine will not add to the other organs.
If it could add a significant percent, the thyroid will be the critical organ.
The use of these dose factors gives an annual dose assuming an average Ci/sec release rate.
Since these dose calculations are for a period less than a year, a correction factor equal to the fraction of the year must be applied.
. Rev. 1 Feb. 1979 Therefore, thyroid dose =
-5
-8 12 N/52 [1.32 x 10 x 1.5 x 10 + 5.71 x 10 x 1.1 x 10 lO I-131
+ N/52 [(1.32 x 10-5)(6.5 x 102 + 2.4 x 10 )) Qlf-3
= N/52 [6.3 x 10 QI-131 +
H-3 Maximum organ dose =
N/52 (1.32 x 10-5)(6.5 x 10 + 2.4 x 10 ) QH-3
-5
+ N/52 [1.32 x 10 x 4.1 x 10 + 5.71 x 10' x 9.5 x 10 ]Q P
= N/52 [4.0 x 10~
Q
~
O II-3 p