ML20009A010
| ML20009A010 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 07/02/1981 |
| From: | Ward E NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8107070360 | |
| Download: ML20009A010 (1) | |
Text
Northern States Power Company 414 ' hco!!et Mall Minneapohs. Minnesota 55401 Telephone 1612) 330-5500 July 2, 1981 s
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Mr J G Keppler, Director, Region III 9-JR0 Ob
- 12 Of fice of Inspection & Enforcement C
D U S Nuclear Regulatory Commission g
799 Roosevelt Road Glen Ellyn, IL 60137
\\ c' PRAIRIE ISLAND INCLEAR GENERATING PLANT Docket No. 50-282 License No. DPR-42 50-306 DPR-60 Environmental Event Report 81-01 Under TS B-5.4.2.A, we are required to report as an Environmental Event, when a protection condition is exceeded. TS B-2.4.1 specifies that during chlorination periods, the total residual chlorine concentration at the outf all of the circulating water system shall not cxceed 0.05 ppm for a chlorination cycle of not more than two hours per day.
The daily chlorination cycle on June 4, 1981 extended for i duration of 126 minutes due to a malfunction of the timer.
As correction cccion a new electronic timer with more precise time control has been installed with a setting of 110 minutes per day.
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W E C Ward, PE Manager-Nuclear Environmental Services ECW/jh Director, NRR c/o DSB (17) cc Resident Inspector MPCA Attn: J W Ferman 8107070360 010702~'
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