ML20050A965
| ML20050A965 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 03/22/1982 |
| From: | Murray T TOLEDO EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| K82-518, RO-NP-09-82-02, RO-NP-9-82-2, NUDOCS 8204020454 | |
| Download: ML20050A965 (2) | |
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s TOLEDO
%mme EDISON March 22, 1982 Log No. K82-518 File: RR 2 (NP-09-82-02)
N Docket No. 50-346 O
g License No. NPF-3
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p Mr. James G. Keppler
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/]p Regional Director, Region III t;a, 798gg 3,,
Office of Inspection and Enforcement ce s
U. S. Nuclear Regulatory Commission Tc
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799 Roosevelt Road g
Glen Ellyn, Illinois 60137
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Dear Mr. Keppler:
Enclosed are two copies of Reportable Occurrence NP-09-82-02, which are being submitted to you in accordance with Technical Specification 6.9 to provide 30 day written notification of this occurrence.
t Yours truly, NAy O.??/v fJW Terry D. Murray Station Superintendent Davis-llesse Nuclear Power Station TDM/1j k Enclosure cc:
Mr. Norman lialler, Director Office of Management and Program Analysis rnel:
2 copies Ohio Environmental Protection Agency Northwest District Office Encl:
1 copy Mr. Luis Reyes NRC Resident Inspector Encl:
1 copy I
tue vn c nn en.cnu c n..n EDISDN PLAZA 300 MADISON AVENUE TOLEDO, OHIO 43652 p/ I B204020454 820322 PDR ADOCK 05000346 MAR 2 g S
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.a TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE REPORTABLE OCCURRENCE NP-09-82-02 DATE OF EVENT:
February 22, 1982 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Total residual chlorine in station effluent above Environment Technical Specification discharge concentration limit Conditions Prior to Occurrence: The unit was in Mode 1 with Power (MWT) = 1893 and Load (Gross MWE) = 612.
Description of Occurrence: On February 22, 1982 at 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br />, the beach station's high chlorine alarm in the Control Room was acknowledged by a Control Room operator.
Free chlorine was discharged in excess of the Environmental Technical Specifications, Section 2.3.1 limit of two hours per day. The maximum measured free chlorine con-centration for this occurrence was 0.28 mg/ liter and was within the 0.5 mg/ liter limit for daily concentration. No unit power reductions resulted from the occur-rence, and no action statement was entered.
Designation of Apparent Cause of Occurrence: This occurrence was the result of an equipment deficiency. The adjustment for the feed rate setting on this chlorinator unit is very coarse, making it difficult to obtain the desired rate.
It should be noted that this chlorinator is not normally used for the service water chlorination, but the normal service water chlorinator was not operational due to maintenance.
Analysis of Occurrence: There was no danger to the health and safety of the public or station personnel. The daily maximum concentration of 0.5 mg/litet free availa-ble chlorine was not exceeded. No other systems were affected by the occurrence, and there were no off-site consequences s Corrective Action: The immediate response to the problem was the shutdown of the circulating water chlorination at 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> on February 22, 1982, and the reduction from 1500 lbs/ day to 150 lbs/ day for the service water chlorination at 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br /> on February 23, 1982. To prevent a recurrence of this situation, the feed rate will be verified during chlorination system lineup changes. When this chlorinator is put int) service or the feed rate is adjusted, Instrument and Control personnel will re-check the status of the system after two hours. This will verify the system's satisfactory operation and determine whether a problem existed before any limits were exceeded. This precaution will be added to the station chlorination procedure.
Failure Data: There have been no similar previous occurrences.
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