ML19347A965

Environ Event Rept 80-03:on 800820,during Special Chlorination Program,Certain Levels of Chlorine Found Outside Circulating Water Sys That Exceeded Concentration Limits in Tech Specs 2.4.1

ML19347A965
Person / Time
Site:	Prairie Island
Issue date:	09/25/1980
From:	Ward P NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
RO-80-03, RO-80-3, NUDOCS 8009300573
Download: ML19347A965 (4)

Text

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.a NSP NORTHERN STATES POWEN COMPANY winusApo u e. minussora es4oi September 25, 1980 Mr J G Keppler, Director, Region III Office of Inspection & Enforcement U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Mr Keppler:

PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket No. 50-282 License No. DPR-22 50-306 DPR-60 Environmental Event Report 80-03 Chlorine - TS B 2.4.1 On August 28, 1980, the plant circulating water system was subjected to a Special Chlorination Program designed to destroy the parasitic amoeba l

found in the system. Conduct of the program was in accordance with the NRC authorization dated August 27, 1980.

During conduct of this program certain levels of chlorine were found outside the circulating water system that exceed the concentration limits set in TS-B 2.4.1.

Although the protection conditions in this section are strictly applicable to aspects of the special program, we are reporting not the occurrence as an Environmental Event consis tent with TS-B 5.4.2. A.

During conduct of the six hour long chlorination cycle, recirculation canal water was found moving towards the river from the intake structure skimmer wall. Because of this condition, samples were collected on the river side of the skimmer wall and the following results were logged:

Chlorine Time Samples Total, ppm 10:42 Near the surface 0.0 11:15 Near the surface 0.15 11:45 Near the surface 0.7 12:45 Near the surface 0.80 13:20 20' toward the river 1.1 13:50 Near the surface 0.55 14:25 6' tcward the river 0.8 14:25 Under the wall 1.6 b

14:55 6' toward the river 1.2 b

{

g 14 :55 Under the wall 1.4 8009300$73 s

D NCRTHERN STATES PCWER COMPANY Mr J G Keppler September 25, 1980 Page J Our biologists have reviewed the incident and conclude for the short time that elevated chlorine levels were found, the environmental impact of this was minimal in magnitude and limited to the immediate intake vicinity.

The high chlorine demand of the ambient river water would rapidly reduce the chlorine levels. A representative of the Minnesota Department of Natural Resources in attendance during the program observed that the chlorine levels did not cause significant fish kills.

For future chlorination programs, the blowdown from the plant will be increased in an attempt to prevent chlorinated water from moving into the river at the intake canal. During the just conducted special chlorination j

program, blowdown flow to the river and natural evaporation was astimated to be 25 cfs.

Increasing the blowdown to 50-60 cfs will increase the flow cowards the plant intake and prevent recirculation of chlorinated water into the river.

A complete report is being developed for the Minnesota Pollution Control Agency regarding the particulars of the program. The report scope will include test results of the success of destroying the parasitic amoeba and other items as fish losses and cooling tower drift. Copies of this report will be furnished to NRC as requested in the authorization documents.

Yours very truly, Q

E C Ward, PE Manager-Nuclear Environmental Services ECW/jh cc Director, NRR c/o DSB (17)

MPCA Attn: J W Ferman

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