ML18219D517

03/28/1977 Letter Abnormal Environmental Occurrence of Total Residual Chlorine at the Condensate Outlet Exceeding the 0.10 Ppm Limit in Violation of Appendix B Technical Specifications Section 2.2.1.2

ML18219D517
Person / Time
Site:	Cook
Issue date:	03/28/1977
From:	Jurgensen R Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	James Keppler NRC/IE, NRC/RGN-III
References
LER 1977-002-00
Download: ML18219D517 (6)

Text

NRC FORth 12-76) <<~ $ 95 tv.S. NUCLEAR REGULATORY C SSION DOC T NUMRFR 0- /

FILE NUMBER NRC DISTRIBUTION FDR PART 50 DOCKET MATERIAL ENVIRONtfENTAL TO J.G. KEPPLER FROM: INDIANA 6 MICHIGAN PWR. CO. DATE OF DOCUMENT BRIDGhfAN," MICHIGAN 3/28/77 R.W. JURGENSEN DATE )E/E)VED

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LTR. CONFIRMING RELEPHONE CONVERSATION CONGER ING ABN019fAL ENVIRONMENTAL OCCURRENCE OF THE 1 TOTAL RESIDUAL CHLORINE AT XHH CONDENSATE OUTLET EXCEEDING THE-0/10 ppm LIMIT.....

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~merloan INOIANA 8r MICHIGANPOWER COMPANY Operating License DPR-58 DONALD C. COOK NUCLEAR PLANT Docket No. 50-315 P.O. Box 458, Bridgman, Michigan 49106 AEO 50-315/77-02 March 28, 1977 Mr.. J. G. Keppler, Regional Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road ~egu aery Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

This is to confirm our telephone call to Mr. K. Baker - NRC Region III, at 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br /> 90 March 28, 1977. During that conversation, we reported that an abnormal environmental occurrence had taken place at 2105 hours0.0244 days <br />0.585 hours <br />0.00348 weeks <br />8.009525e-4 months <br /> on March 26, 1977, when the total residual chlorine at the condensate outlet exceeded. the 0.10 ppm limit in violation of. Appendix "B" .

Technical Specifications Section 2.2. 1.2. This letter should also be construed as the written report required by Technical Specification Section 5.4.2.1.

The circulating water chlorination system was placed in service on March 22, 1977, with chlorine feed rate adjusted to maintain a total chlorine residual at 0.02 ppm. Total chlorine residual at the condenser outlet ranged from un-detectable to 0.02 ppm throughout the week with the system chlorinating twice per day on a 20 minute'ycle. On March 26, 1977, total chlorine residuals during the 0900 hour0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br /> cycle were at 0.02 ppm; however, at the 2100 cycle, the total residual indicated 0. 12 ppm at 2105 hours0.0244 days <br />0.585 hours <br />0.00348 weeks <br />8.009525e-4 months <br /> and immediately dropped back to 0.02 ppm at 2110 hours0.0244 days <br />0.586 hours <br />0.00349 weeks <br />8.02855e-4 months <br />, remaining at this level until the end of the chlorination cycle. All chlorination cycles since this incident have indicated residuals of 0.02 ppm with the system still in automatic and at the same feed rate.

Investigation has indicated no chlorination equipment mal-function nor any other concrete 'evidence for this spike.

The two most likely causes for this incident are (1) analytical error or (2) chlorine gas surge at the beginning of the ch'lorin-ation program. As all other chlorination cycles since March 22, 1977, showed no evidence of surging at the program start and

y3 ~'I'i "$ 6 E'<<~'if' r ss Mr. J. G. Keppler March 28, 1977 Page Two the total residuals during the entire period were quite consistant in the 0.02 ppm range, analytical error is the most probable cause.

I As the indicated residual- was only slightly above the maximum value for a very brief time period, it is felt that no adverse environmental impact occurred.

Should you require further information, please contact me.

Since rely,

~o~R. W. Jurgensen Plant Manager

'WJ/ng cc: R. S. Hunter J. E. Dolan R. Kilburn G. E. Lien R. J. Vollen, BPI K. R. Baker, RO: III P. W. Steketee, Esq.

R. C. Callen R. Walsh, Esq.

G. Olson R. S. Keith PNSRC File G. Charnoff, Esq.

J. M. Henni gan Dir.,

'ir.,

(Di.rectorate IE (20 copies)

MIPC (2 copies) of Licensing

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