ML20080P737

Submits Follow Up Rept on Authorized Discharge of Cooling Water to Lake Wylie That Occurred on 950222-23 at Plant & Informs of No Observed Environ Impact During Discharge. Underground Pipe Repaired & Cause Being Investigated

ML20080P737
Person / Time
Site:	Catawba
Issue date:	02/28/1995
From:	Funderburk J DUKE POWER CO.
To:	Robinson L SOUTH CAROLINA, STATE OF
References
NUDOCS 9503080109
Download: ML20080P737 (3)

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. Duke M er Company -

y, g:: . Catauba Nucleur Station l 4400 Concord Road l; Y>rt SC29745 : )

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' February 28,1995 .l

Mr. Lanny Robinson South Carolina Department of Health and Environmental Control- 4 P.O. Box 100  :

Fort Lawn, S.C. 29741 j i

Subject:

Catawba Nuclear Site  !

NPDES Permit #SC0004278 l Unauthorized Discharge -j File: CN-702.26 i i

Dear Mr. Robinson:

Per your request this memo is a follow-up report on the unauthorized discharge of cooling water (via yard drain) to Lake Wylie that occurred on February 22 and 23,1995 at Catawba Nuclear ' l Station. There was no observed environmental impact during this discharge. This event will also .j be noted on the NPDES Discharge Monitoring Report pursuant to Part II. B. 3. of the subject  !

permit.

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On February 22,1995, at approximately 4:30 p.m. water was observed to be seeping up from the' l ground at the Unit 2 cooling tower yard area. The flowrate was visually estimated to be thirty to. l fifty gallons per minute. Julie Lott of DHEC was notified via the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> notification line at 5:30 l p.m. on February 22.  !

The system was last checked for chlorine content on February 21,1995, by Environmental f Chemistry and none was detected. At the point of rupture, the water was sampled for dispersant i levels and temperature on February 22,1995. It was found to contain 4 ppm of a dispersant  !

(used to keep solids suspended in solution). The chemical used was BL-7071 (Duke Power .j MSDS number 19502). The chemical is identified by the manufacturer as not containing any j SARA / CERCLA hazardous substances. The water contained no other chemicals. The j temperature of the water was 72.5 degrees Fahrenheit.

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\f The actual release occurred due to a stress crack in an underground pipe that is used to transport i the Unit 2 condenser cooling water to the Unit 2 cooling towers. The stress crack was caused  !

when a drop in temperature of the cooling water occurred as Unit 2 came offline. Unit 2 came - l

- offline on February 21,1995 at 9:54 p.m. The flow was stopped by digging a pit to collect the - l water at 8:30 a.m. on February 23,1995. The water was pumped from this pit to the Unit 2 C l cooling tower. It is estimated that between twenty-nine thousand seven-hundred (29,700) and i forty-nine thousand five-hundred (49,500) gallons of RC water flowed to Lake Wylie between the  ;

time the leak was identified and when the flow was stopped. l l

The underground pipe has been repaired, the system has been returned to service, and Unit 2 will  !

be returned to service soon. The root cause of the pipe failure and possible corrective actions are j still under investigation. j Ifyou should have any questions concerning this matter or need additional information, please  ;

contact Joe Funderburk at (803) 831-3925 or Cheryl Peed at (803)831-3361. j i

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Sincerely,  !

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-Joe Funderburk, Scientist N l

CNS Environmental Management l

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cc: Al Williams, SCDHEC - Catawba District  !

NRC - Document Control Desk - Docket No: Unit 2 50-414 i; NRC - S.D. Ebneter NRC - R.E. Martin i NRC - R.J. Freudenberger J.J. Horsley - ECl2T

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