ML20084J366

Ro:On 730109,representatives from Industrial Bio-Test Labs Conducted Chlorine Sampling in Discharge Bay in Attempt to Confirm Residual Levels Determined by Station Personnel. Tests Also Conducted on 730118 & 23

ML20084J366
Person / Time
Site:	Quad Cities
Issue date:	02/09/1973
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084J323	List: ML20084J321 ML20084J332 ML20084J355 ML20084J366
References
BBS-73-21, NUDOCS 8305120572
Download: ML20084J366 (5)

Text

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.. p Com wealth Edison Quad Citi;s NucIzar Pow :r St; tion U

Post Office Box 216 Cordova, Illinois 61242

,,,e . Telephone 309/654 2241

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$ % .Mj[*' f February 9,1973

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Mr. A. Giambusso Deputy Director for Reactor Projects Directorate of Licensing U. S. Atomic Energy Commission Washington, D. C. 20545

Reference:

Quad-Cities Nuclear Power Station

, Docket Nos. 50-254 and 50-265 DPR-29 & 30, Appendix B, Section 1.1 & 3 1. A.

Dear Mr. Giambusso:

The purpose of this letter is to report chlorine residual concentrations in the discharge bay in excess of the Limiting Conditions for Operation in the Non-Radiological Technical Specifications. The limit of .1 ppm free and combined chlorine in the discharge bay was exceeded on several occasions during the past 30 days due to the normal operation of the chlori-nation system.

On January 9,1973 chlorination of the Unit 2. condenser was scheduled. Due to a low confidence in the accuracy of re-sidual chlorine measurements, representatives f.7om Industrial Bio-Test Laboratories were requested to obtain shmples in the discharge bay in an attempt to confirm residual levels determined by station personnel. 308 gallons of sodium hypochlorite 'fere injected at a rate of 12 to 15 gpm during.

the 22 minute cycle. The center water box residual analyzer was inoperable at the time. Total chlorine residual' mca-surements of discharge bay samples analyzed by Bio-Test ranged from .04 to .36 ppm during the cycle. These values-were obtained with a Wallace & Tiernan titrator and gonfirmed. -

using a Fisher & Porter titrator. The results of all Ediscn s samples during this period were O ppm using the station's?

Wallace & Tiernan titrator.

A new cell was obtained for the station's titrator and chlorination of the Unit 2 condenser was again' conducted . >

on January 18, 1973 348 gallons of hypochlorite werex -

injected into the circulating water system and r alisti'c '

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.O O Mr. A. Giambusso February 9,1973 results were obtained on discharge bay residual samples for the first time.

TIME FLOW RATE TOTAL RESIDUAL 1525 12 gpm o ppm 1528 11 0 1532 14 .1 l

1535 16 .1 1538 18 .1 1542 20 .6 1546* 20 1.0 1551 --

1.0 1556 --

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1. Injection stopped at 1545 l On January 23, 1973 another chlorination was scheduled with Bio-Test. Samples were also taken during this run from the intake to determine the affect of the ice-melt recirculation flow which is currently diverting about 25% of the discharge flow back to the intake. The following measurements were made which show a reasonably good correlation between Edison ,

and Bio-Test results with the residuals determined by station personnel being slightly higher.

TIME FLOW CECO DISCHAR0E BIO TEST DISCHAR0E BIO TEST INTAK!

TOTAL RESIDUAL PPM RESIDUAL PPM RESIDUAL PPM TOTAL - FREE TOTAL - FREE y 0831 -10 gpm --

s.01 <. 01 <.01 c.01 0835 13 -- -- -- -- --

,0837 15 <.1 -- - -- --

v' 0840 16 --

<.01 .<.01 .04 .04

. '. , 0843 17 .7 -- -- -- --

0847 14 1.3 -- -- -- --

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0850 16 --

.84 35 .06 .06 0853 15 1.3 -- -- -- --

0856 Hypochlorite system off ,

0900 0 1.4 1.23 .01 .02 .02 0907 0 .2 -- -- -- --

0910 0 --

.2 .04 q . 01 c.01 A total of 356 gallons of sodium hypochlorite was injected during this run. At 1400 on the 23rd another chlorination was conducted with the injection flow rate being manually controlled at a constant 10 gpm. Measurements made by Bio-Test during this injection were as follows:

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. . .O O Mr. A. Giambusso February 9,1973

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TIME DISHCARGE BAY INTAKE -

TOTAL - FREE TOTAL - FREE 1400 c. 01 c. 01 s.01 (.01 1410 .12 .03 <.01 s.01 1420 .68 .01 s.01 c.01 1430 76 35 s.01 c. 01 1440 .07 .01 c. 01 t. 01 1450 5,01 (. 01 c. 01 <.01 A total of 232 gallons were injected with the system being shutdown at '1425.

During both 'of these runs Bio-Test obtained samples in the Mississippi River downstream of the diffuser pipes. Signi-ficantly, no residual free or combined chlorine was detected in the river during either of the chlorination periods.

Condenser chlorination was also conducted on January 31, 1973 with total residual chlorine in the discharge bay ranging from .2 to 1.5 ppm. -

, During the startup of both units at Quad-Cities numerous hardware problems have been encountered with the Hypochlorite System. As discussed above, chlorine residual analysis has 4

also been questionable in -the past. On February 2, 1973, however, the. circulating water systeus of both units were chlorinated with the system functioning as designed. As'can be seen in the following table of results, the automatic-feed rate controller properly regulated tha flow rate to obtain a residual of about- .3. ppm free chlorine in the center water box sample. 212 gallons- of hypochlorite- were injected

-into Unit 1 from 1300 to 1323 and 148 gallons were injected into Unit'2 between 1323 and 1346. -

' TIME FLOW WATERBOX ANALYZER DISCHARGE - B AY GPM PPM FREE CHLORINE RESIDUAL PPM FREE - TOTAL ~

Uni (1: 1300 6'- >1.00 <.05- <.1

-1301- 3- >1.00 1302~ 4 .50 1303 7 .02 1304 8 .02-1305 9L .02 1306- 11- .02  :<.05 .15 1307 'll .

.02-11308' -11 .20 1309_ 10- >1.00~

11310' 10 .>1.00 A

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Mr. A. Giambusso February 9,1973 TIME FLOW WATERBOX ANALYZER DISCHARGE BAY -

GPM PPM FREE CHLORINE RESIDUAL PPM FREE - TOTAL ,

1311 9 >1.00 1312 8 .04 1313 10 .06 .05 .25 1314 10 .06 1315 10 .06 1316 10 .12 1317 10 .12 .1 .6 1318 10 .12 .1 .6 1319 10 30 1320 10 30 1321 8 .30 1322 9 .25 1323 9 30 Unit 2 1323 9 0 1324 8 >1.0 1325 8 >1.0 .1 9

'1326 8 >1.0 1327 6 .70 1328 6 .60 1329 6 30 1330 4 30 1331 4 .1 1332 5 '

.04 .2 1.1 1333 6 .04 1334 6 .04 1335 6 .04 1336 6 .04 1337 7 .02 1338 7 .02 1339 8 .02 1340 8 .02 .15 .6 1341 10 .02

. 1342 10 .02 1343 10 .15 1344 10 .20 1345 10 .25 .

1346 10 .28 .05 75 It can be seen from these results that effective chlorination cannot be accomplished and still maintain less than .1 ppm l total residual in the discharge bay. With the system now l I

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Mr. A. Giambusso February 9, 1973 fully operational, each unit is being chlorinated daily for 20 minutes in the automatic mode. It is fully expected that the Limiting. Condition for Operation will be exceeded with each cycle. The LCO originally proposed and accepted for the'Non-Radiological Specifications by Commonwealth Edison of .5 ppm free chlorine, however, has never been exceeded

, to our knowledge and should not tur exceeded now. We still believe this to be a more realistic limit and it in accord-ance with the original system design capability.

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEA POWER STATION A

A fdffd& W B. B. Stephenson Superintendent BBS/lk 9

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