ML13322B109
| ML13322B109 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 02/23/1990 |
| From: | Nandy F SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9003090134 | |
| Download: ML13322B109 (5) | |
Text
Southern California Edison Company 23 PARKER STREET IRVINE, CALIFORNIA 92718 F. R. NANDY February 23 1990 TELEPHONE MANAGER OF NUCLEAR LICENSING (714) 587-5400 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555
Subject:
Docket Nos. 50-206, 50-361 and 50-362 Annual RCS Specific Activity Report San Onofre Nuclear Generating Station, Units 1, 2 and 3 The purpose of this submittal is to provide the Annual Reactor Coolant System (RCS) Specific Activity Report for 1989 required by Technical Specifications (TS) 6.9.1.5 to Provisional Operating License No.
DPR-13 for San Onofre Unit 1 and Facility Operating Licenses NPF-10 and NPF-15 for San Onofre Units 2 and 3, respectively. This report provides information concerning the periods of time when RCS specific activity exceeded the limits of TS 3.1.1 for Unit 1 and TS 3.4.7 for Units 2 and 3.
Unit 2 specific activity exceeded TS limits on two occasions in 1989. There were no instances in 1989 in which Unit 1 or Unit 3 RCS specific activity exceeded TS limits.
If you require any additional information, please let me know.
Very truly yours, Enclosures cc:
J. B. Martin (Regional Administrator, NRC Region V)
C. W. Caldwell (NRC Senior Resident Inspector, Units 1, 2 and 3)
Institute of Nuclear Power Operations (INPO) 9003090134 900223 PDR D0C~05000206 PR DC PNU
1989 RCS SPECIFIC ACTIVITY REPORT SOUTHERN CALIFORNIA EDISON COMPANY SAN ONOFRE NUCLEAR GENERATING STATION, UNITS 1, 2 AND 3 DOCKET NOS. 50-206, 50-361 AND 50-362 On January 12, 1989, at 1725, with Unit 2 in Mode 3, following a reactor shutdown required by plant Technical Specifications, analysis of a Reactor Coolant System (RCS) sample indicated that RCS specific activity exceeded 1.0 microcurie/gram Dose Equivalent (DE) 1-131 due to iodine spiking.
A combination of purification system operation and iodine isotope decay resulted in reducing RCS specific activity to less than 1.0 microcurie/gram DE 1-131 by 0400 on January 13, 1989. The time duration that the specific activity of the primary coolant exceeded the radio-iodine limit for this event was approximately 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> and 35 minutes.
On May 13, 1989, at 1032, with Unit 2 in Mode 3, following a reactor shutdown to investigate increased primary to secondary steam generator leakage, a RCS sample indicated RCS specific activity exceeded 1.0 microcurie/gram DE 1-131 due to iodine spiking. A combination of purification system operation and iodine isotope decay resulted in reducing RCS specific activity to less than 1.0 microcurie/gram DE 1-131 by 1415 the same day. The time duration that the specific activity of the primary coolant exceeded the radio-iodine limit for this event was approximately 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> and 43 minutes.
Additional information required by Technical Specification 6.9.1.5 is presented below. Figures 1 and 2 provide a graphic presentation of 1-131 concentration and 1-133 (the other radio-iodine isotope selected for this purpose) concentration in microcuries/gram as a function of time for the duration of the specific activity above the steady state level for the January 12, 1989 and the May 13, 1989 events.
REACTOR POWER HISTORY Period Reactor Power 01/10/89, 1725 to 01/11/89, 1800 100%
01/11/89, 1800 to 01/11/89, 2330 100% decreasing to 80%
01/11/89, 2330 to 01/12/89, 0915 80%
01/12/89, 0915 to 01/12/89, 1430 80% decreasing to 0%
01/12/89, 1430 to 01/12/89, 1725 0%
05/11/89, 1032 to 05/13/89, 0120 100%
05/13/89, 0120 to 05/13/89, 0636 100% decreasing to 0%
05/13/89, 0636 to 05/13/89, 1032 0%
1989 RCS SPECIFIC ACTIVITY REPORT SOUTHERN CALIFORNIA EDISON COMPANY SAN ONOFRE NUCLEAR GENERATING STATION, UNITS 1, 2 AND 3 DOCKET NOS. 50-206, 50-361 AND 50-362 REACTOR COOLANT SYSTEM SPECIFIC ACTIVITY Date/Time of Sample DE 1-131 (uCi/gram) 01/11/89, 0045 0.090 01/12/89, 1725 1.080 01/12/89,2114 1.510 01/13/89, 0026 1.240 01/13/89, 0400 0.926 05/13/89, 0723 0.536 05/13/89, 1032 1.500 05/13/89, 1415 0.980 CLEANUP FLOW HISTORY Period Average Cleanup Flow (gpm) 01/10/89, 1650 to 01/12/89, 0950 44.05 01/12/89, 0950 to 01/12/89, 1750 84.45
- 05/11/89, 0950 to 05/13/89, 0050 44.19 05/13/89, 0050 to 05/13/89, 1050 91.41
- Cleanup flow is the average flow with two charging pumps in operation.
FIGURE 1 01/12/89--1/13/89 2.1 2
1.9 1.8 1.7 E
- i.
1.5 O
1.4 z
1.3 1.2 1.1 h
1 0
0.9 z
0 0.8 0.7 o
0.6 o
0.5 0.4 0.3 0.2 0.1 00:00 17:25 21:14 00:26 04:00 08:45 00:00 TIME (Hrs) 0 1-133
+
1-131
FIGURE 2 2.1 05/13/89--5/14/89 21 2
1.9 1.8
- IN 1.7 E
1.6 1.5 1.4 z
1.3 1.2 1.1 1
0.9 z
O 0.8 0 w 0.7 o
0.6 0.5 0.4 0.3 0.2 0.1 0
00:00 07:23 10:32 14:15 19:47 00:00 IME (Hra) 0 1-133
+
1-131