ML18142A752
| ML18142A752 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 09/16/1977 |
| From: | White L Rochester Gas & Electric Corp |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18142A752 (9) | |
Text
OOC KET NUMBE R
'ILE NUMBER Rochester Gas 8 Electric Co Rochester, NY L D White Jr DATE OF OOCMMEQT lo TO A Schwencer,,
OATS RECEIVED 9 19 77 ONOTORIZEO jkNCLASSIFIEO PROP INPUT FORM NUMBER OF COPIES RECEIVED LETTER
@ORIGINAL QCOP Y raic~~W ENCLOSU RE Requested info concerning chlorine monitoring i
data>>
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
OESCRIPTION I
RE NRC ltr dtd 7-21-77
~ ~ ~ ~ ~.trans the
/
following.
3p lp PLANT N~
R E Ginna i
9>> 20-77 ehf FOR ACTION/INFORMATION ENVIRIlINMENTAL ASSIGNED AD!
V>> MOORE LTR BRANCH CHIEF!
PRO JECT MANAGER.
%%AGER!
LICENSING ASSISTANT..
EN ING ASSISTANT!
B>> HARLESS INTERNALDISTRIBUTION STFMSSAFETY'ITE SAFETY 8c PLANT'YSTEMS TEDESCO ENVIRON ANALYSIS TTSO E
DENTON Bc MULLER EN OYA IPPOLITO RO TECH ERNST'ERATING'EACTORS GAMMILL 2
SITE ANALYSIS BUNCH J>>
COLLLVS TZQ2f EXTERNALDISTR IB.UTION CONTROL NUMBER tirt A C I JV
. SIC
/II(54 g,90~9+
IV
. HANCEKTT 6 CYS ACRS SENT CA GO NRC FORM IIId {S 7d)
NRC FORM 196 UN. NUCLEAR REGULATORY C~
4IISSION IS-7SI.
-NRC DISTRIBUTION FoR PART 50 DOCKET MATERIAL
L
'I 4.i a
e 11
s 4+
1 t! /IIIIIIIIIIIIII/I//IIII/If/ill/
(K(ggqy II,6II,')
Iraqi I,A
/rZru/IJ~I JJIIIIIIIII ROCHESTER GAS AND ELECTRIC CORPORATION o
89 EAST AVENUE, ROCHESTER, N.Y. 14649 LEON D. WHITE. JR.
VICE PRKSIOKNT TKLKPHONK ARKA cooK 715 546.2700 September 16, 1977 Director of Nuclear Reactor Regulation ATTN: Mr. A. Schwencer, Chief Operating Reactors 'Branch gl U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Schwencer:
~I >;gi~r In response to your July 21, 1977 request for chlorine monitoring data, the attached information is presented.
Very truly yours,
/
I L. D. Whit, Jr.
I
ROCHESTER GAS AND FLECTRIC CORPORATION GINNA STATION CHLORINE MONITORINGDATA NRC DOCKET 4 50-244 1.
During normal plant operation, the condenser cooling water is presently treated a maximum of five times per week for thirty minute periods.
A 15% solution (as C12) of NaOCl is injected on the down stream side of the four traveling screens'.
A sample of c'ondenser water is continuously taken from a point just prior to the circulating water discharge to the lake.
The sample is being monitored by a Wallace and Tiernan A-780 Amperometric Analyser.
Since late May 1976, the chlorination has been manually initiated at the above mentioned frequency by a lab technician.
A grab sample is taken near the end of the chlorination cycle to determine total and free available chlorine and to check the calibration of the continuous analyser.
2.
ASTM D 1253 "Amperometric Titration Method" and "Non Referee Method A" (orthotolidine colorimetric method) are used to determine free and total residual chlorine.
The colorimetric method is a back up method for the normally used amperometric method.
3.
With the amperometric method, the minimum detectable C12 concentration is about 0.01 ppm and the precision is + 0.01 ppm in the 0.01 to 0.50 ppm range.
The colorimetric method has a M.D.L. of 0.05 ppm and a precision of + 0.05" ppm in the same range.
4.
a.
Chlorination was initiated at Ginna Station in January, 1970.
The program at that time was to chlorinate for 20 to 30 minute periods three times per day
~
Starting in late May 1976 the chlorination was reduced to a maximum of five cycles per week for thirty minute periods.
b.
None.
c.
The Wallace and Tiernan A 780 on line analyser has been found ineffective in the measurement of free C12, but it gives fair total residual results.
The cell system needs cleaning about every other week and calibration weekly.
During the summer it may need more work than in the winter.
In order to control NaOCl feed more carefully, a lab technician is monitor-ing chlorination. If there is a large change in level or C12 concentration in the hypochlorite storage tank, the feed rate may need changing.
Occa-sionally this has resulted in spikes in C12 concentration in the discharge canal.
This is due to the time lag between feed and sample.
A change in the recirculation flow can also cause discharge C12 concentration changes.
CHLORINE MONITORING ATA
'NRC DOCKET 4 50-244 cont'd.)
Page 2
5.
The chlorination schedule used during january, February, April 1976, and most of May was three twenty minute chlorinations per day.
During most of January, all of February and March and parts of April and May the unit was shut down.
The unit was also shut down most of August and October.
As mentioned before, the chlorination from May 1976 until present has been one thirty minute injec-,.
tion a maximum of five times per week.
The following table gives total and free chlorine levels obtained by laboratory analysis for days that sodium hypochlorite was injected.
The samples were taken at the last minute of the chlorination interval.
Date 1976 Total Chlorine Free Chlorine
- january 13 19 29
.08
.02
.08
.02
.03
.01
.07
.00 February 21 24
.05
.02
.04
.Ol May 25 26 27 28
.29
.24
.15
.19
.12
.08
.08 June 1
2 3
4 7
8 9
10ll 16 17 18 21
.19
.24
.23
.24
.16
.18
.14
.17
.10
.11
.10
.16
.08
.09
.12
.12
.11
.07
.05
.04
.04
.04
.00
.00
.03
.02 August 2
5 g.l
(.1
c n
t
'1
~
~
~
~
~
CHLORINE MONITORINGDATA RRC DOCKET 50-244 cont'd.)
Page 3
Date 1976 Total Chlorine Free Chlorine November 2
3 8
9 10ll 15 16 17 1'8 19 23 29 30 C'. 1
.32
.37
.35
.34
.20
.35
.35
.32
.31
.26
.22
~.25 4.1
.23
.23
.23
.21
.23
.10
.16
.20
.23
.19
.14
.10
.09 December 1
3 6
7 8
10
.24
.64
.61
.33
.40
.42
.07
.45
.45
.27
.35
.32
9
~
~
~f
~
F