ML19330B737
| ML19330B737 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 07/28/1980 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | |
| References | |
| NJK-80-259, NUDOCS 8008050435 | |
| Download: ML19330B737 (2) | |
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@ Commonwealth Edison Quad Cit;es Nuctear Power Station 22710 206 Avenue Nortn Corcova, lu.ncis 61242 Te,epnene 333 654-2241 rlJ K-80-259 July 28, 1980 Dr. Harold R. Denton Director of the Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Reference:
Quad-Cities Nuclear Power Station Units 1 and 2; Docket Numbers 50-254 and 50-265 DPR-29 and DPR-30, Appendix B, Section 3.1.A.
Dear Dr. Denton:
The purpose of this letter is to report a Chlorine Residual Concentration in the discharge bay which exceeded Technical Specification 1.lA, Appendix B, Non-Radiological Technical Specifications.
The limit of 1.0 ppm average chlorine concentration was exceeded on July 11, 1980. The estimated maximum chlorine concentration was 5.3 pom, with an estimated average chlorine concentration of 2.7 ppm.
Due to a damaged diaphragm in an air operated valve, service water leaked into the sodium hypochlorite tank on July 10, 1980.
Because of this dilution, an analysis was performed to determine the tank's concentration.
The results showed 430 ppm total chlorine, making the solution virtually ineffective. A discharge which would be within Technical Specification limits was calculated to be around 500 gpm.
The installed injection system can only deliver 20 gpm.
A sump pump was utilized to pump the contents of the tank into the intake bay.
A sample was taken during this period, with the resuits indicating a much higher level of total chlorine residual than expected. The pumping was immediately terminated, giving an injection duration of 53 minutes.
Analysis were performed following termination of the pumping until the total chlorine residual reached an undetectable level.
Upon further investigation, it was determined that the initial analysis of the tank's concentration may have been improper. The initial analysis was for determining total chlorine, whereas the desired parameter was percent of sodium hypochlorite solution.
Subsequent attempts to correlate the two analyt: cal methods have been unsuccessful.
@ee3 8008050(fK L
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~.Dr. Harold R. Denton Pa'ge 2-July-28, 1980 Through ' comparison of-the river flow on July 11 and the chlorinated
-discharge stream's flow,.a dilution of 24:1 occurred.
Because of
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. this large dilution ratio, there was minimal effect on the environment
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due to.the release.
Sincerely, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION
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N. J. Kalivianakis Station Superintendent NJK:VJS/bb cc J. Keppler, Region ill I
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