ML19317G029
| ML19317G029 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/24/1975 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| References | |
| NUDOCS 8002210732 | |
| Download: ML19317G029 (2) | |
Text
.c QSMtJD
,m
/
SACRAMENTO MUNICIPAL UTILITY DISTRICT C 6201 S Street. Box 15830. Sacramento California 95813:' (916) 4!2-3211 April 24, 1975 s
's Direecor d ', i M
Divioion of Reactor. Licensing
/*
APgo0i3/5;,,(r.
U.S. Nuclear Regulatory Commission
='
t Washington, D.C.
20545 5:,
e.
Re: Operating License DPR-54
[
/p/
Docket No. 50-312
.g/, '
,s' Unusual Event 75-3
. [-M\\ \\ /
'is.
Dear Sir:
As defined by Technical Specification" " Appendix B", Section 5.6.2.C, we are reporting the following Unur aal Event as UE-75-3.
On April 18, 1975 at 1310 during routine effluent water sample collections, the technician detected the smell of chlorine in the effluent water. The sample indicated the discharge was 1.8 ppm, which is over the Technical Specification limit of 0.2 ppm.
Because of previous probicms encountered with high chlorine discharges, the h
ciren1scing w ea* chlorineter vac d - dict:1 cucpected... :=ple.
(/
was obtained from the circulating water system and analyzed. The chlorine concentration was only 0.3 ppm in the circulating water system and an investigation was initiated to find the source of the high chlorine st the effluent.
i A check of plant activities revealed that a tank truck had made a delivery of hypochlorite to the Nuclear Service Raw Water System Hypochlorite Storage Tanks. The records indicated the truck arrived
.on. site at 1050 and departed at 1235 on April 18.
Personnel responsi-ble for monitoring' the delivery activities. were contacted and they verified that there was no spill of hypochlorite during the delivery.
However, after filling the last tank, the driver drained the hose to the storm drain. The assumed quantity of discharged hypochlorite is approximately four gallons..A follow-up sample upstream of the circu-lating water system had a chloride concentration of 4 0 ppm, confirming the source to be the storm draiti system. Dilution water was increased and frequent monitoring of the effluent water was initiated. At 1545 the chlorine concentration at the effluent was 0.12 ppm and was within the Technical Specification limit.
i'
,)V o
o 8002 210 7 7,4725 b
$@% @hhf" COPY SENT REGION,f m
m AN E LECT RI C-S YSTE M S E RVIN G MORE-THAN-600,000 IN THE HEART OF C ALIFO R N I A
_ _ _ _