ML19317G870

Forwards Data Re Chlorine Monitoring Program in Response to RW Reid 770715 Request

ML19317G870
Person / Time
Site:	Rancho Seco
Issue date:	12/30/1977
From:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Reid R Office of Nuclear Reactor Regulation
References
NUDOCS 8004020531
Download: ML19317G870 (5)

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NRC DISTRIBUT10N pon PART 50 DOCKET MATERIAL FROM:

cars op occumeNr Sacramento Municipal Utility Dist.

12/30/77 TO:

Mr. Robert W. Reid Sacramento, California cars sectivEo J. J. Mattimoe 1/9/78 Tran Quoronizac Pace imeurpoRM NuMS4n oP COPIES mECSIVED I

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SIeMfO 6CC'Y Enctosuma anierson Consists of data requested by NRC pertaining to the chlorine monitoring program....

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g-SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6 gygg 95813; (916) 452-3211 04Q December 30, 1977 U.S. Nuclear Regulatory Commission d

ATTN:

Mr. Robert W. Reid, Chief

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Operating Reactors Branch No. 4

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Re:

R.W. Reid to J.J. Mattimoe Letter Dated July 15, 1977 f.Y i

Dear Mr. Reid:

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A response to the referenced letter from you, requesting a report on our chlorine usage and nonroutine chlorine releases,was to be submitted to you on a voluntary basis within sixty days. On September 2, 1977, Mr. D.G.

Raasch (SMUD) asked for and received from L. Olshan (NRC) an extension to January 1, 1978.

At that time we were at a high level of activity at Rancho Seco performing the first core refueling and surveillance inst tion.

Please find attached the data you requested pertaining te our chlorine monitoring program.

If you have further questions please feel free to contact R.J. Rodriguez at Rancho Seco, pec lly submitted, h

%0 f TCP J.D.Mattmoe Assistant General Manager and Chief Engineer JJM:RWC: sal Attach.

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A% ELECTRIC SVSTEY SERVFN3 M0P( TWAN 6 0 0.0 C 0

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3 ANSWERS TO QUESTIONS

,No. 1 A Use' involving chlorine gas:

Chlorine gas is used in the main condenser.

Frequency Rate Condenser System A 4 times per day 1650#/ day for 15 mins.

Condenser System B 4 times per day 1650#/ day for 15 mins.

Plant Cooling Water System 4 times per day 450#/ day for 15 mins.

Rate #/ day System Time of Chlorination i

1650 Condenser A 0310-0325 0910-0925 1510-1525 2110-2125 1650 Condenser B 0410-0425 1010-1025 1610-1625 2210-2225 650 Plant Cooling Wtr. 0510-0525 1110-1125 1710-1725 2310-2325

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On a weekly basis, sample the effluent water at the outlet of the discharge structure approximately one hour after initiation of chlorination cycle.

The grab sample is then analyzed for total residual chlorine.

B Use involving sodium hypochlorite:

Sodium hypochlorite is used in the makeup water system.

The Hypochlorite is injected as the water enters the clarifier to m intain a total chlorine residual of 0.2 ppm maximum. The clarifier is sampled twice a week, and l

the total chlorine residual is checked at that time.

Chlorination of the clarifier has been in operation since November of 1974 to present.

Hypochlorite is also_used in the plant sewage creatment effluent. We try to maintain a free residual chlorine concentration of 0.5 ppm.

Samples are obtained three times / week.

The combination of sewer effluent and cooling tower blowdown water total chlorine residual is maintained at less than 0.2 ppm.

No. 263 Types of analysis - Colorimetric Orthotolidine - has been used since chlorination was started -

reference APHA p.p. 123-124 (197)

DPD - instituted its use in January 1977 -

reference APHA Standard Methods, 13th Ed. 129 (1971)

Orthotolidine: Sensitivity 0.01 mg/l Precision discussed in 14th Edition 1975 Tables 409 I through V, ALPHA Standard Methods DPD Method:

Sensitivity 0.02 ppm Precision discussed in APRA Standard Methods 14 Edition 1975 Tables 409 I through V f

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Q ANSWERS TO QUESTIONS No. 4 a) Date chlorination initiated for the condenser system and sewer systems was approximately January 1974.

b) Additional mehtods for maintaining condenser cleanliness we have used would be air lancing the_ condenser tubes, which was done only once in the Spring of 1974.

c) Equipment failures:

Chlorination system for the condensers - Control valves o casionally have to have 0-rings replaced and Sewer hypochlorite system - metering pumps and supply lines get plugged up.

d) Continuous monitoring - In June,1977 SMUD installed a Fischer & Porter Series 17B4200A Anachlor Residual Chlorine Analyzer Transmitter.

It is an ampero metric type transmitter that continually measures and records the chlorine residual.

The sensitivity of this instrument is 0.1 ppm.

We have had considerable difficulty with the operation of this unit.

The inlet filter has plugged frequently, which blocks sample flow invalidating any measurements. The unit has been taken out of service and we are now in the process of trying to get a better filtration system.

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ANSWERS TO QUESTIONS No. 5 Concentration.

Sample Total Chlorine (ppm)

Date Time Time of Chlorination

<0.02 1-7-76 1355

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<0.02 1-14-76 1110 1010

<0.02 1-21-76 1345 1110" 0.10 1-2E-76 1115 1010

<0.02 2-4-16

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<0.02 2-11-76

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<0.02 2-18 76-1100 1010 4

0.02 2-25-76 1405 1110-0.04 3-3-76 1350 1110 1

<0.02 1-10-76 1400 1110 l

<0.02 3-17-76 0820 0510

<0.02 3-24-76 1645 1610 t

<0.02 3-31-76 1530 1510.-

<0.02 4-7-76 0945 0910

<0.02 4-14-76 0940 0910

<0.02 4-21-76 1245 1110 4

0.04 4-28-76 0840 0525 0.12 5-5-76 1200 1110 4

0.15 5-12-76 1145 1110

<0.02 5-19-76 1530 1510

<0.02 5-26-76 0905 0510

<0.02 6-2-76' 1500 1125

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<0.02 6-9-76 1145 1110

<0.02 6-16-76 1330 1110 i

I 0.05 6-23-76 1130 1010

<0.02 6-30-76 1330 1110 1

<0.02 7-7-76 0845 0510 I

0.04 7-14-76 0845 0510

<0.02 7-21-76 1115 1110-

<0.02 7-28-76 1130 1010

<0.02 8-4-76 1530 1510

<0.02 8-11-76 1430 1110

<0.02 8-18-76 1345 1110

<0.02 8-25-76 1500 1110

<0.02' 9-1-76 1539 1510

<0.02 9-8-76 0930 0910

<0.02 9-15-76 1400 1110

<0.02 9-22-76 0840 0510 l

'0.02 9-29-76 0855 0510 0.05 10-6-76 0300 2325 0.02 10-13-76 0100 2325-

<0.02 10-20-76 1515 1125 0.06 10-27-76 0720 0510 I

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Continued Concentration Sample.

Time of Chlorination Total'CDlorine (ppm)

Date Time 0.10 11-3-76 1105 1010 0.05 11-10-76 1130 1010'

<0.02 11-17-76 1050 1010 0.08 11-24-76 1320 1110 l

<0.02 12-1-76 1405 1110

<0.02 12-8-76 0845 0510

<0.02 12-15-76 1400' 1110-

<0.02 12-22-76 0900 0525 0.12 12-29-76 1115 1010 No dilution factors were used in any of the above concentrations.

No. 6 N/A i

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