ML20126J754
| ML20126J754 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/11/1985 |
| From: | SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML20126J734 | List: |
| References | |
| PROC-850411, NUDOCS 8506100690 | |
| Download: ML20126J754 (10) | |
Text
Enclosure 1 0FFSITE DOSE CALCULATION MANUAL REVISION 16 8506100690 850411 DR ADOCK O gi
OFFSITE DOSE CALCULATION MANUAL REVISION 16 The changes to the ODCM are delineated as follows:
I 1.
The following footnote was added to Section 2.1.'3:
"7804 to be used until the completion.and turnover of DCPS3N. Until turnover is complete and upon adoption of Unit 2 Technical Specification Amendment 31 and Unit 3 Technical Specification Amendment 20, either Section 2.1.3.1 or 2.1.3.2 may be used to determine the maximum permissible alarm setting."
2.
A new Section 2.1.3.1, " Maximum Permissible Alarm Setting (RT-7865)"
to provide the method for determining the maximum permissible alarm setting for RT-7865 as a maximum release rate (uCi/sec).
3.
A new Section 2.1.3.2, "Maximun Permissible Alarm Setting (7804-1)
(2RT-7828)" to add monitor 2RT-7828 for containment purge and to provide the method for determining the maximum permissible alarm setting for 2RT-7828 in pCi/cc and for RT-7804 in cpm.
4.
In Section 2.1.4, Monitor 2/3-7814 was deleted and Monitor 3RT-7865 added. The method for calculating the maximum permissible alarm setting for 3RT-7865 was added. The reason for the substitution of 3RT-7865 for 2/3 RT-7814 is that 7814 is no longer in the Technical Specifications.
5.
The maximum permissible waste gas header flow rate on page 2-10 of l-Revision 15 was changed to reflect the fact that when 3RT-7865 or 2/3 RT-7808 are monitoring waste gas release, dilution with stack flow has occurred.
The changes in this revision to the ODCM do not reduce the accuracy or reliability of the dose calculations or setpoint determinations.
This revision was reviewed and found acceptable on January 31, 1985.
l l
l l
l
[
L
If there is no release associated with this monitor, the monitor setpoint should be established as close as practical to background to prevent spurious alarms yet assure an alarm should an inadvertent release occur.
2.1.3 Containment Purge - 2RT-7804-l* 3RT-7604-1*
For the purpose of implementation of Specification 3.11.2.1, the alarm setpoint level for noble gas monitors is based on the gaseous effluent flow rate and meteorological dispersion factor.
'the concentration at the detector corresponding to a total body dose rate of 500 mrenVyr at the exclusion boundary is determined by using:
(0.45) (P ) (2120 cfm
) (500 mrenVyr) (10 Ci/uci) 4 2
Cdet2 =
/sec (24)
Flow 3
(M %, cfm) (X/0, sec/m ) { (gi, mrenVyr) (Ci )j 3
uCi/m (0.45) (P ) (2120 cfm
) (500 mrenVyr) (10 C1/uci) 3 4
Cdet3 "
"3/sec (2-7)
Flow 3
(MM, cfm) (X/0, sec/m ) h (K, "ENYE) (Ci yj i
C 3
tot uCi/m
- 7804 to be used until the completion & turnover of DCPS3N. Until turnover is complete and tpon adoption of Unit 2 'Nch spec Amendment 31 and Unit 3 Tech Spec Amendment 20, either Section 2.1.3.1 or 2.1.3.2 may be used to determine the maxim a permissible alarm setting.
(
2-5R t
2.0 GASEOUS EFFLUDFTS (Continued) 2.1.3 (Continued)
The concentration at the detector corresponding to a 3000 mreny'yr skin dose rate at the exclusion area boundary is deteunined by using:
(0.45) (P ) (2120 cfm
) (3000 mravyr) (10-6 Ci/uCi)
~
2 Cdet2 =
m /sec 3
(2-6a)
Flm 3
(Rate, cfm) (X/0, sec/m ) (f(Li + 1.lMi "YYr) (Ci )j C
3 uCi/m (0.45) (P ) (2120 cfm
) (3000 mrervyr) (10 Ci/uci) 4 3
Cdet3 =
m*/sec (2-7a)
Flm 3
(Rate, cfm) (X/0, sec/m )
ggi + 1,1gi mrem /yr)(Ci )j C
3 tot uCi/m where:
Cdet2 = 1he instantaneous concentration at the detector in uCi/cc.
ht3 = The instantaneous concentration at the detector in uCi/cc.
0.45 is an administrative values used to account for potential activity from other gaseous release pathways.
P2 and P3 are administrative values used to account for 2-6R
~
e simultaneous releases from both SONGS 2 and SONGS 3.
'1he fractions
'1 P2 and P3 will be assigned such that P2+P3 1 1.0.
the containment purge flow rate in cfm flow rate
=
40,000 cfm full purge
=
2,000 cfm mini purge
=
other parameters are as specified in 2.1.1.1. above.
i.
the analler of the values of maxima permissible Cdet from equation (2 6) or (2-6a) and for equations (2-7) or (2-7a) is to be used in determining the maxim a permissible monitor alarm setpoints.
2.1.3.1 Maxima permissible alarm setting (RT-7865) r d
the maxim a permissible alarm setting expressed as a maxim m release rate (uci/sec) is determined by converting' the concentration at the detector, Set to an equivalent release rate in uCi/sec.
I max (Set,uCi/cc) (flow rate, cc/sec)
A
-where: A the maxinnan pemissible release rate
=
max l
Cdet = the analler value of 9 et, as obtained from equation (2-6, 2-6a) or (2-7, 2-7a) flow rate flow rate, cc/sec
=
either 9.439E5 cc/sec for mini purge or 1.888E7 cc/sec for main
=
Purge.
2-7R
I 2.1.3.2 Maxime Permissible Alarm Setting (7804-1) (2RT-7828)
'the maxima permissible alarm setting for 2RT-7828 is the analler of the values of Cdet2 (uCi/cc) from equations (2-6) and (2-6a).
The maxima permissible alarm setting for 7804 (cpm) is determined by using the calibration constant for the containment Airborne Monitor given in Table 2-1.
The Maximum permissible alarm setpoint is the cpm value corresponding to the concentration, Cdet, obtained from the smaller of equations (2-6, 2-6a) or (2-7, 2-7a).
The calibration constant is based on Kr-85 or on Xe-133 whichever yields a lower detection efficiency.
The alarm setpoint will not be set greater than the maxim a permissible alarm setting determined above.
If there is no release associated with this monitor, the monitor setpoint should be established as close as practical to background to prevent spurious' alarms yet assure an alarm should an inadvertent release occur.
1 2-8R
l 2.1.4 Waste Gas Header 7865, 2/3 RT-7808 For the purpose of Specification 3.11.2.1, the alarm setpoint level for noble gas monitors is based on the gaseous effluent flow rate and meteorological dispersion factor.
Since the waste gas header discharges to the plant vent stack, either 3-7865 or 2/3 RT-7808 may be used to monitor waste gas header releases.
1he concentration at the detector corresponding to a body dose rate of 500 mre#yr or a skin dose rate of 3000 mre Wyr at the exclusion boundary is determined by using equation (2-1) and (2-2) with area sample concentration (Cg) being obtained from the waste gas decay tank to be released.
'Ihe smaller of the values of maximtzn permissible concentration (Set) frca equations (2-1) or (2-2) is to be used in determining the maximtza permissible monitor alarm setpoint.
2-9R
d o
2/3 RT-7808 The maximtan permissible alarm setting is determined by using the calibration constant for plant vent stack monitor 7808 given in Table 2-1.
'Ihe maximum permissible setpoint is the com value correspording to the concentration Cdet, (smaller value from equation (2-1) or (2-2).
3 RT-7865 The maximum permissible alarm setting expressed as a maximum release rate (uCi/sec) is determined by converting the concentration at the detector, Cdet, to an equivalent release rate in uCi/sec by equation (2-8).
(C&,., uCi/oc) (flowrate, cc/sec)
(2-8) hx
=
2 where hx the maximum permissible release rate, uCi/sec '
=
Set the smaller value of Cdet, as obtained from equations
=
(2-1) or (2-2) flowrate flowrate,cc/sec
=
7.83E7 cc/sec for 2 fan operation or 3.92E7 cc/sec for 1
=
fan operation for3-7865viewkngonly1/2thetotalPlant 2
corrects
=
Vent Stack Flow.
(
2-10R
=
T A release from the waste gas header is not possible if:
_QC yi)
(f)
> C det F
where
([Cyg) total concentration in waste gas holdup tank to be released
=
f waste gas header effluent flow rate, cpm
=
plant vent stack flowrate in cfm (166,00 cfm for 2 fan F =
operation, 83,000 for 1 fan operation)
Cdet smaller of the values of Cdet from equations (2-1) or (2-2)
=
If a release is not possible, adjust the waste gas header flow by determining the maximian permissible waste gas header effluent flow rate corresponding to the Vent Stack Monitor setpoint in accordance with the following:
C (0.9) detF (2-9)
Ei Cgi
(
(
2-10Ra
e
~
~
I Where:
f waste gas header effluent flow rate (cfm)
=
F plant vent stack flow rate (cfm) used in equations (2-1)
=
or (2-2)
Cdet the analler of the value of % t from equation (2-1) or
=
(2-2) 2C i
Ti = total gamna activity (uCi/cc) of the waste gas holdup tank to be released, as detennined from the pre-release sample analysis.
'Ihe 0.9 is an adninistrative value to account for the potential activity fran other releases in the sane release pathway.
e 2-10Rb
-