ML19316A288
| ML19316A288 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 06/14/1977 |
| From: | Parker W DUKE POWER CO. |
| To: | Schwencer R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7912050857 | |
| Download: ML19316A288 (19) | |
Text
. _ _ _ _ _
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NRC DISTRIBUTION con PART 50 DOCKET MATERIAL TO:
FROM:
DATE OP OOCUMENT Duke Power Company 6/14/77 Mr. A. Schwencer Charlotte, North Carolina oATE RECEivEo William O. Parker 6/20/77
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C CoPv CESCRIPTION ENCLOSU RE 7pN - -
Consists of information related to 7.S U 2 o / ['s7P v, [~
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equilibrium & transient iodine activity
"-J for the period March, 1976 to March, 1977..
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PL\\NT NAME: Oconee Units 1 2-3 RJL 6/20/77 CAFEW FOR ACTION /INFORMATION ENVIRf7NMENTAL I. ASSIGNED ADr e
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DUKE POWER COMPANY Powra Den.nzwo 422 Socin Cucucu Srazzr, Ciunt.orTz, N. C. 282 42 June 14,1977 W8 LM AM O PA R W E R J R.
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Mr. A. Schwencer, Chief
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RE: Oconee Nuclear Station s
Docket Nos. -269, -270, -287
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Dear Mr. Schwencer:
As requested by your letter of April 18, 1977, please find attached information related to equilibrium and transient iodine activity at Oconee Nuclear Station for the period March, 1976 to March, 1977.
Very truly yours,
-(. h.
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.j-William O. Parker, Jr. C Neh.
WOP /jm cc:
Mr. R. T. Bond Mr. H. B. Tucker Mr. J. E. Smith Mr K. S. Canady Mr. R. F. Wardell Mr. D. C. Holt Mr. R. B. Thompson Mr. M. S. Tuckman Mr. W. A. Haller Mr. Lionel Lewis Mr. C. T. Yongue Master File: OS 801.03 Section File: OS 801.03 l
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OCONEE NUCLEAR STATION EQUILIBRIUM AND TRANSIENT IODINE ACTIVITY EXPLANATORY NOTES 1.0 Date - Date transient occurred.
2.0 Percent Power - Net power changes in excess of 25%. Length of time over which power change occurred is not qualified due to the relative inaccessibility of this data.
3.0 Isotope - Isotopes as requested.
4.0 Concentration - Expressed as microcuries per milliliter.
4.1 First and second columns are measurements taken prior to transient.
4.2 Third colu=n is measurement of transient peak.
4.3 Fourth colu=n is measurement of post-transient equilibrium.
5.0 Measurements were not reported if they were less than 10-3 microcuries per milliliter or were not taken based on previously indicated activity levels.
6.0 Units that operated at constant power level for entire month experienced no transients.
7.0 Units that were out of service for the entire =onth experienced no tran-sients.
i i
i
l OCONEE NUCLZAll STATION UNIT NO. 1 1.
100: Reactor Thermal Power = 2568 MWE 2.
RC System Cleanup Flowrate =
70 GPM 3.
RC Systen Temperature 5320F
=
4 RC System Pressure
= 2155 PSI RC SYSTEM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 3-23-77 100 I-131 5.5 X 10-1 0.30 0.42 0.30 down I-133 0.18 0.55 0.35 0.12 Xe-133 1.40 1.35 1.75 0.10 Xe-135 0.37 0.82 0.57 0.13 3-13-77 100 I-131 6.4 X 10-1 0.28 0.12 4.4 X 10-1 up I-133
<10-3 Xe-133 0.62 0.90 1.20 0.62 Xe-135 0.60 0.70 0.75 0.37 2-28-77 100 I-131 0.10 1.90 0.95 0.65 down I-133 0.25 1.50 0.38 0.14 Xe-133 2.70 2.20 3.70 3.0 Xe-135 0.80 0.90 0.70 0.40 2-8-77 100 I-131 0.17 0.32 0.35 0.19 up I-133 3 X 10-2 3.6 X 10-1 8.5 X 10-1 5 X 10-1 Xe-133 0.36 0.50 0.80 0.14 Xe-135 0.62 0.78 0.90 0.14 2-1-77 100 I-131 4.3 X 10-1 0.25 0.37 0.27 down I-133 0.17 0.55 0.34 0.12 Xe-133 1.20 1.70 1.30 0.90 Xe-135 0.90 0.85 0.75 0.65 (1)
OCONEE NUCLEAR STATION UNIT NO. 1 RC SYSTEM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1
-1 1-26-77 100 I-131 0.11 5.8 X 10-1 4.7 X 10-1 3.4 X 10 Up I-133 7.8 X 10-1 0.10 0.13 0.14 Xe-133 0.33 0.64 1.20 0.70 Xe-135 0.59 0.90 0.88 0.75 1-16-77 100 I-131 9.0 X 10-1 0.98 1.09 0.95 down I-133 0.16 0.65 0.60 0.48 Xe-133 3.20 3.20 3.50 2.40 Xe-135 0.90 0.92 0.40 0.30 12-23-76 30 I-131 1.3 X 10-1 1.6 X 10-1 1.8 X 10 2.3 X 10-1
-1 Up I-133 0.11 0.13 0.12 Xe-133 0.40 0.66 0.95 0.87 Xe-135 0.82 0.81 0.88 0.62 12-22-76 70 I-131 3.2X10:2 2.3 X 10-1 1.6 X 10-1 9.0 X 10-2 Up I-133 8.7 X 10 0.12 0.22 0.11 Xe-133 1 X 10-2 Xe-135 6 X 10-1 0.95 X 101 2 X 10-1 1.5 X 10-1 2
6 X 10-0.82 12-8-76 100 I-131 3 X 10-1 7 X 10-1 4 X 10-1 2 X 10-1 down I-133 4 X 10-1 8 X 10-1 0.10 3 X 10-1 Xe-133 3.8 X 10-2 0.02 0.9 X 10-1 Xe-135 4 X 10-2 3 X 10-1 0.15 3 X 10-1 12-7-76 100 I-131 7 X 10-1 2 X 10-1 1 X 10-1 down I-133
<10-3 Xe-133 7 X 10-1 0.13 4 X 10-1 3 X 10-1 Xe-135
<10-3 (2)
OCONEE NUCLEAR STATION UNIT NO. 1 RC SYSTEM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 11-18-76 100 1-131 4 X 10-1 0.26 8 X 10-1 down I-133 0.15 0.46 7 X 10~1 Xe-133 0.24 0.60 0.58 0.38 Xe-135 0.65 0.80 0.23 3 X 10-1 11-16-76 50 I-131 0.11 up I-133
<10-3 Xe-133
<2 X 10-1 Xe-135
<10-3 11-15-76 40 I-131 5 X 10-1 up I-133
<10-3 Xe-133
<2 X 10-1 Xe-135
<10-1 10-31-76 100 I-131 0.19 0.46 0.49 0.38 down I-133 0.13
'0.13 0.13 8 X 10-1 Xe-133 1.0 1.5 1.6 1.5 X 10-1 Xe-135 0.40 0.40 0.25 7 X 10-1 10-26-76 100 I-131 8 X 10-1 2.6 0.92 0.25 down I-133 0.11 2.0 0.55 0.14 Xe-133 2.80 4.80 4.30 1.20 Xe-135 0.85 0.97 1.00 0.85 10- 8-76 50 I-131 0.12 0.58 0.18 0.10 down I-133 0.14 0.22 0.24 0.13 Xe-133 2.40 3.10 3.10 2.80 Xe-135 0.78 0.80 0.90 0.61 n
(3)
OCONEE NUCLEAR STATION UNIT NO. 1 RC SYSTEM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 9-5-76 55 I-131 8.5 X 10-1 0.12 0.10 7 K 10-1 Up I-133 0.16 0.25 0.18 7 X 10-1 Xe-133 1.80 2.30 1.80 Xe-135 0.80 0.88 0.68 9-4-76 100 I-131 6 X 10-1 0.70 0.34 0.14 down I-133 0.12 0.96 0.23 0.13 Xe-133 1.70 2.30 1.40 Xe-135 0.40 0.52 0.24 8-29-76 50 I-131 9 X 10-1 0.22 0.16 0.10 down I-133 0.12 0.35 0.18 0.15 Xe-133 1.50 1.70 3.90 2.30 Xe-135 0.58 0.54 1.20 0.54 8-14-76 75 I-131 9 X 10-1 0.55 0.38 0.11 down I-133 9 X 10-1 0.21 9 Z 10-1 Xe-133 0.90 0.95 1.20 1.00 Xe-135 0.30 0.46 0.60 0.45 7-13-76 100 I-131 9 x 10-1 0.38 0.12 9 X 10-1 down I-133 0.23 0.51 0.23 0.18 Xe-133 1.60 2.10 1.80 1.20 Xe-135 0.33 0.5v 0.41 0.30 7-7-76 100 I-131 0.10 0.65 0.16 9 X 10-1 down I-133 0.24 0.90 0.22 0.19 Xe-133 1.80 2.20 2.10 1.40 Xe-135 0.38 0.44 0.36 (4)
OCONEE NUCLEAR STATION UNIT NO. 1 7.
RC SYSTDI ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 6-29-76 30 I-131 0.10 0.10 0.10 Up I-133 0.25 0.23 0.25 Xe-133 1.50 2.80 1.40 Xe-135 0,43 0.36 0.55 6-28-76 70 I-131 0.10 0.10 Up I-133 0.25 0.27 Xe-133 0.45 1.80 1.70 Xe-135 0.13 0.41 0.41 6-27-76 100 I-131 0.10 0.70 0.15 0.10 down I-133 0.30 1.0 0.25 0.26 Xe-133 1.20 2.30 1.80 Xe-135 0.24 0.41 0.36 6-22-76 90 I-131 0.11 0.10 0.10 Up I-133 0.25 0.30 0.30 Xe-133 1.50 2.20 2.00 Xe-135 0.41 0.47 0.49 6-21-76 100 I-131 0.12 0.36 0.20 0.11 down I-133 0.30 0.65 0.38 0.25 Xe-133 2.60 2.80 1.50 Xe-135 0.38 0.55 0.41 6 76 90 I-131 8 X 10-1 0.28 6 X 10-1 Up I-133 0.30 0.70 0.30 Xe-133 1.10 1.40 1.30 Xe-135 0.40 0.42 0.35 (5)
OCONEE NUCLEAR STATION UNIT NO. 1 o
RC SYSTDI ACTIVITY DATE POWEP ISOTOPE CONCENTRATION uCi/M1 6-8-76 100 I-131 6 X 10-1 0.29 0.14 6.4 X 10-1 down I-133 0.3C 0.80 0.32 0.22 Xe-133 0.41 0.90 0.82 Xe-135 0.28 0.37 0.18 6-1-76 40 I-131 4.4 X 10-2 4.5 X 10-2 5.8 X 10-2 Up I-133
<10-3 1
Xe-133 0.35 0.44 0.41 Xe-135 0.24 0.38 0.36 3
5-31-76 40 I-131
<10 3 Up I-133
<10 3 Xe-133
<10 3
<10-Xe-135 4-18-76 70 I-131 1.4 X 10-2 3.2 X 10-1 1.8 X 10-I down I-133 8.2 X 10-1 9.0 X 10-1 7.5 X 10-1 Xe-133 0.21 0.32 0.30 Xe-135 0.13 0.17 8 X 10-1 NOTE: Unit did not operate during March, 1976 (6)
OCONEE NUCLEAR STATION UNIT NO. 2 1.
100% Reactor Ther=al Power = 2568 ina:
2.
RC System Cleanup Flowrate =
70 GPM 3.
RC System Te=perature 532 F r
=
4 RC System Pressure
= 2155 PSI RC SYSTEM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 3-29-77 65 I-131 0.38 0.37 0.33 0.31 Up I-133 0.55 0.43 0.45 Xe-133 10.3 7.63 8.80 7.00 Xe-135 5.5 3.43 3.80 3.10 3-28-77 65 I-131 0.25 0.26 0.58 0.50 down I-133 0.48 0.78 0.66 0.63 Xe-133 0.48 0.47 10.3 7.60 Xe-135 2.60 2.70 5.50 3.40 3-24-77 80 I-131 0.26 0.25 0.26 Up I-133 0.34 0.27 0.36 Xe-133 7.80 5.80 5.20 5.00 Xe-135 2.50 2.30 1.90 1.90 3-23-77 100 1-131 0.27 6.20 1.20 0.47 down I-133 0.22 3.30 0.58 0.33 Xe-133 6.80 4.70 9.50 7.80 Xe-135 3.40 2.50 2.20 1.90 NOTE: Unit operated at 100% power February and January 12-28-76 60 I-131 0.10 0.12 0.13 0.15 Up I-133 0.38 0.46 0.47 0.35 Xe-133 0.14 0.95 0.95 1.2 Xe-135 0.60 0.35 1.40 1.60 (7)
OCONEE NUCLEAR STATION UNIT NO. 2 RC SYSTEM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uC1/M1 12-27-76 100 I-131 0.12 0.77 0.18 0.10 down I-133 0.26 2.40 0.37 0.34 Xe-133 4 X 10-1 0.10 0.19 0.14 Xe-135
<10-2 0.40 0.60 0.35 12-25-76 70 I-131 0.47 1.20 0.30 0.12 Up I-133
<10-2 Xe-133 4 X 10-1 0.10 0.19 0.14 Xe-135
<10-2 12-5-76 100 I-131 0.31 5.00 3.50 3.52 down I-133 0.25 5.00 1.30 0.72 Xe-133 4.5 9.3 8.6 1.7 Xe-135 2.5 2.5 0.85 4.5 x 10-1 NOTE: Unit operated at 100% power during November 10-17-76 80 I-131 0.40 0.35 0.50 0.40 Up I-133 0.42 0.45 0.60 0.52 Xe-133 6.8 4.7 2.4 Xe-135 0.92 1.3 1.4 10-16-76 60 I-131 0.37 5.00 1.6 0.40 down I-133 0.14 1.40 0.30 0.33 Xe-133 5.7 3.7 6.8 4.7 Xe-135 1.4 0.85 0.92 1.3 10-13-76 40 I-131 0.50 0.60 0.92 0.68 down I-133 0.50 0.60 0.90 0.48 Xe-133 3.7 4.6 5.u 4.4 Xe-135 1.9 2.1 1.8 1.'
(8)
OCONEE NUCLEAR STATION UNIT NO. 2 RC SYSTEM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uC1/M1 10- 4-76 30 I-131 0.37 0.75 0.77 0.55 Up I-133 0.57 0.93 0.75 0.60 Xe-133 5.8 7.2 3.6 5.6 Xe-135 2.0 2.7 1.6 10- 3-76 40 I-131 0.46 0.38 0.55 0.37 down I-133 0.70 0.56 0.90 0.57 Xe-133 4.5 3.2 5.8 7.0 t
Xe-135 2.2 1.5 2.0 2.7 9-19-76 40 I-131 0.50 0.49 0.65 0.65 Up I-133 0.85 0.85 0.75 0.75 Xe-133 3.5 5.8 7.6 5.8 Xe-135 1.7 2.1 2.0 1.8 9-18-76 40 I-131 0.50 0.49 0.65 0.65 down I-133 0.85 0.85 0.75 0.75 i
Xe-133 3.5 5.8 7.6 5.8 Xe-135 1.7 2.1 2.0 1.8 9-10-76 90 I-131 0.52 3.70 1.60 0.63 Up I-133 0.11 5.10 0.12 0.58 Xe-133 3.6 6.5 4.6 4.0 Xe-135 1.0 1.0 1.3 1.5 9-8-76 100 I-131 0.52 3.70 1.60 0.63 down I-133 0.11 5.10 0.12 0.58 Xe-133 4.7 3.6 6.5 4.6 Xe-135 1.7 1.0 1.0 1.3 (9)
OCONEE NUCLEAR STATION UNIT NO. 2 RC S'lSTEM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 8-30-76 90 I-131 2.00 0.65 0.48 0.42 Up I-133 1.20 0.77 0.85 0.85 Xe-133 1.6 6.5 6.5 4.6 Xe-135 0.20 1.4 1.4 1.6 8-29-76 90 I-131 0.42 0.42 0.50 8.50 down I-133 0.85 1.00 0.88 6.50 Xe-133 5.8 5.1 6.2 1.6 Xe-135 1.9 1.7 1.2 0.20 8-4-76 60 I-131 0.52 1.10 0.58 Up I-133 1.1 X 10-2 1.0 X 10-2 3.3 X 10-1 Xe-133 0.62 0.45 0.58 0.68 Xe-135
<10-3
<10-3 0.11 0.56 7-27-76 70 1-131 1.20 3.5 X 10-1 8.5 X 10-1 1.80 down I-133 3 X 10-1 4.5 X 10-2 6.2 X 10-2 6.6 X10-2 Xe-133 2.4 2.5 5.0 3.5 Xe-135 0.58 0.61 0.13 1.8 X 10-1 7-26-76 30 I-131 0.31 0.25 1.0 0.40 down I-133 0.98 0.52 1.4 0.20 Xe-133 1.9 2.4 2..-
2.4 Xe-135
.48 0.88 0.95 0.94 7-15-76 35 I-131 1.5 X 10-2 1.2 X 10-2 2.6 X 10-2 Up I-133 1.2 X 10-1 1.0 X 10-1 1.9 X 10-1 Xe-133 1.8 X 10-1 2.3 X 10-1 5.1 X 10-1 Ke-135 2.5 X 10-1 4.8 X 10-1 5.1 X 10-1 (10) i b
k
O OCONEE NUCLEAR STATION UNIT NO. 2 RC SYSi N ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 7-13-76 40 I-131
<10-3 Up I-133 5.5 X 10-2 3.7 X 10-1 1.1 X 10-1 Xe-133
<10-3 7.8 K 10-2 1.9 X 10-1 Xe-135 1.3 X 10-2 2.5 X 10-2 5.0 X 10-1 7-12-76 25 I-131
<10-3 down I-133
<10-3
<10j Xe-133 Xe-135
<10 7-11-76 25 I-131
<10-3 Up I-133
<10-3 3
<10 3 Xe-135
<10 NOTE: Unit did not operate during June and May 4-7-76 70 I-131 1.7 X 10-1 1.6 X 10-1 1.9 1.6 down I-133 1.3 X 10-1 1.7 X 10-1 1.2 4.2 X 10-1 Xe-133 0.90 0.90 1.3 0.65 Xe-135 0.24 0.24 0.36 0.20
-1
-1 2.0X10f1.5X10 3-27-76 30 I-131 1.6 X 10 1.8 X 10 down I-133 2,2 X 10-1 2.5 X 10-1 2.9 X 10 1.8 X 10-1 Xe-133 0.90 0.30 0.86 8.8 X 10-1 Xe-135 0.23 5.3 X 10-1 0.13 1.6 X 10-1 (11) g.
OCONEE NUCLEAR STATION UNIT No. 3 1.
100% Reactor Thermal Power = 2568 MWE 2.
RC System Cleanup Flowrate =
70 GPM 5320F 3.
RC System Te=perature
=
4.
RC System Pressure
= 2155 PSI 7.
RC SYSTEM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 2 17-76 70 I-131 1.5 X 10-2 2.3 X 10-2 1.2 X 10-1 4.8 X 10-2 Up I-133 1.6 X 10-2 1.8 X 10-2 1.4 X 10-1 3.8 X 10-2 Xe-133 8.1 X 10-1 8.0 X 10-1 8.0 X 10-1 6.9 X 10-1 Xe-135 1.5 X 10-1 1.7 X 10-1 1.8 X 10-1 1.9 X 10-1
-2 3-16-77
.00 I-131 1.5 X 10 2.3 X 10-2 1.2 X 10-1 4.8 X 10-2 down I-133 1.6 X 10-2 1.8 X 10-2' 1.4 X 10-1 3.8 X 10-2 Xe-133 2.8 X 10-1 2.6 X 10-1 1.20 8.2 X 10 1 1
Xe-135 1.1 X 10-1 1.1 X 10-1 2.7 X 10-1 1.5 X 10-2-26-77 50 I-131 1.6 X 10-2
<10-3 Up I-133 4.0 X 10-2
<10-3 Xe-133 6.1 X 10-2 7.9 X 10-2 1 X 10-1 <10-}10-2 9.1 Xe-135
<10-3 4 g to-2 5.8 X 10-2 2-14-77 100 I-131
<10-3 1.8 X 10-1 9 X 10-2
<10-3 down I-133
<10-3 9 x to-2 1,7 y to-2
<10-3
-2 Xe-133 3.4 X 10 2.1 X 10-1 4.9 X 10-1 1.8.
Xe-135
<10-3 1.2 X 10-2 3.5 X 10-2 <10-}10 NOTE: Unit at 100% power during January and December 3
11-17-76 35 I-131
<10 3 Up I-133
<10-Xe-133 1.6 X 10-2 1.2 X 10-2
<10-3 Xe-135
<10-3 (12)
OCONEE NUCLEAR STATION UNIT No. 3 RC SYSTDi ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 11-15-76 40 I-131
<10-3 Up I-133
<10-3 Xe-133 1.4 X 10-2
<10g10-2 1.2 X 10-2 1.3 X 10-2 1.6 Xe-135 11-14-76 40 I-131
<10-3 down I-133
<10-3 Xe-133 1.8 X 10-2 1,3 x 10-2 1.6 X 10-2 Xe-135
<10-3 11-13-76 40 1-131
<10-3 3
Up I-133
<10 3 Xe-133
<10 3
<10-Xe-135 NOTE: Unit did not cperate during October 9-18-76 80 I-131
<10-3 down I-133
<10-3 Xe-133 1.7 X 10-2 1.4 X 10-2 1.5 X 10-2 Xe-135
<10-3 9-17-76 80 I-131
<10-3 Up I-133
<10-3 Xe-133 1.6 X 10-2 <10-}.10-2 1.7 X 10-2 1.4 X 10-2 1.5 Xe-135 3
9-16-76 45 I-131
< 17 down I-133
<10-3 Xe-133 1.4 X 10-2 1.6 X 10-2 1.5 X 10-2 1.6 X 10-2 Xe-135
<10-3 (13)
OCONEE NUCLEAR STATION UNIT No. 3 7.
RC SYSTEM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 9-10-76 60 I-131
<10~3
,3 down I-133
<10
-2 Xe-133 2 X 10-2 2.5 X 10-2 2.8 X 10 2.5 X 10-2 Xe-135
<10-3 8-17-76 40 I-131
<10-3 down I-133
<10-3 Xe-133
<10-3 Xe-135
<10-3 8-1-76 60 I-131
<10-3 Up I-133
<10-3 Xe-133
<10-3 Xe-135
<10-3 7-21-76 100 I-131
<10-3 down I-133
<10-3
-3 Xe-133
<10 Xe-135
<10-3 7-12-76 80 I-131
<10-3 Up I-133
<10-3 3
<10 3 Xe-135
<10-7-11-76 80 I-131
<10-3 down I-133
<10-3 Xe-133
<10-3 Xe-135
<10-3 (14)
__m
OCONEE NUCLEAR STATION UNIT No. 3 RC SYSTDi ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 7-9-76 80 I-131
<10-3 Up I-133
<10-3 Xe-133
<10-3 Xe-135
<10-3 7-2-76 100 I-131
<Vf3 down I-133
<10-3 Xe-133
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<10-3 NOTE: Unit at 100% power during June and May 3
4-23-76 35 I-131
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4-22-76 35 I-131
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4-20-76 100 I-131
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~
OCONEE NUCLEAR STATION
- UNIT NC. 3 RC SYSTZM ACTIVITY DATE POWER ISOTOPE CONCENTRATION uCi/M1 4-17-76 80 I-131
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Up I-133
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<10-3 3-20-76 100 I-131
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