ML20004D690
| ML20004D690 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 06/04/1981 |
| From: | Haller W DUKE POWER CO. |
| To: | NORTH CAROLINA, STATE OF |
| References | |
| NUDOCS 8106090652 | |
| Download: ML20004D690 (2) | |
Text
_. _ _,... _.
DUIm POWER COMPANY STEAM PRODUCTION DEPr.
GENERAL OFFICES TEl.EPH O N E: AREA 704
- p. o. sox 2:7e 422 SOUTH CHURCH STREET 373 4on CILtRLOTTE. N. C. 2S242 g i I r ^-
June 4, 1981
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C99 North Carolina Department of Natural Resources and Cornunity Development
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Division of Environmental Management i,(
" ' g{ty58" erouurg (U P. O. Box 27687 p'\\
N Raleigh, N. C.
27611 y)
Subject:
McGuire Nuclear Station
\\'ON Unauthorized Discharge Notification File: MC-704.21
Dear Sir:
In accor;iance with provisions setforth in the NPDES permit for McGuire Nuclear Station under Part II, A(2), we hereby notify you of a noncompliance occurrence at the subject power plant. The information required under Part II, A(2) follows:
Descrintion of Disc,harge The discharge can'sisted of chlorinated water from the fire protection system main fire pumps to the station intake structure.
Cause of Discharge The fire protection system was being chlorinated to prevent biofouling by the Asiatic clam Corbicula spp. and other =acroinvertebrates. Inadequate sealing of the three recirculation valves on the main fire pumps resulted in leakage of the chlorinated water to the intake structure.
Date and Time of Occurrence Chlorination of the fire protection system was initiated on Msy 20. 1981 at 0940 and terminated on May 21, 1981 at 1545.
Duration of Occurrence The duration was 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, 5 minutes.
Preventior Efforts Chlorination was terminated and the three valves repaired, aib U<!'\\ O 8106090 S
N. C. Dept. of Natural Resources Page 2 June 4, 1981 Summary Approximately 54150 gallons of chlorinated water with a concentration of 3 ppm gree chlorine residual was introduced into our McGuire Nuclear Station intake structure due to improper sealing of threa recirculation valves on the main fire pumps. The chlorine was being added to the fire protection system to prevent biofouling by macroinvertebrates, in particular the Asiatic clan Corbicula spp.
The chlorinated water was introduced into the intake structure while two condenser circulating water pumps were in operation (a 620,000 gpm flow). The chlorinated water was pulled into and through the station condenser cooling water system and had no adverse effect on the receiving water due to extreme dilution and mixing.
Chlorination of the system was halted upon discovery of the leakage and the valves were repaired. We are pursuing incorporation of double isolation on the main fire pumps recirculating piping to prevent future occurrences.
Very truly yours, h
W. A. Haller, Manager Technical and Environmental Services LWP/tw cc: Afa'rold R. Denton Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 N. A. Rutherford
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