ML19343C246
| ML19343C246 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 11/17/1977 |
| From: | Graves R CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| FOIA-81-341 CYH-77-382, RO-ETS-NR-50-21, NUDOCS 8103040688 | |
| Download: ML19343C246 (2) | |
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] CONNECTICUT YANKEE A OMIC POWER COMPANY
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',7 HADDAM NECK PLANT
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RR c 1. BOX 127E. EAST H AMPTON, CONN. 06424 Hovember 17, 1977
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CHY 77-382
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/I l, U. S. Nuclear Regulatory Comission
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Attn: Mr. Boyce Grier, M fh V
.I Director
Reference:
Facility Operating License No. DPR-61 Docket No. 50-213 ETS/NR 50-213/77-8T Letter:
R. H. Graves to B. Grier, dated 11/9/77 Preliminary Report ETS/NR 50-213/77-8P
Dear Mr. Grier:
The following information pertinent to ETS/NR 50-213/77-8P is hereby forwarded pursuant to Section 5.6.2.l(a) of the Connecticut Yankee (CY) Environmental Technical Specifications (ETS).
At 0700 on November 4,1977, the Control Room was notified that the river effluent monitor pump was not running.
Further investigation revealed that the electrical breaker in Motor Control Center #5 which supplies p)wer to the pump was open.
This breaker also feeds the Incore Flux Drive "A"
<nich had been t%ged out of service on October 22, 1977 at 0900.
During this period 223,200 gallons of processed waste liquids containing 7.54 x 10-1 curies of fission and activatien pr:, ducts (excluding tritium, noble gases, alpha and strontium 89 and 90),1.17 x 10-1 curies of dissolved noble gases and 2.66 x 10+2 curies of tritium were discharged.
The discharges represent twenty one test tank releases with an average volume of 10,629 gallons per tank.
The average flow rate of the test tank was 27 gallons per minute. The discharge canal had an average flow Therefore, the effluent from the test tank only of 175,286 gallons per minute.
represents 1.54 x 10-2 percent of the total flow discharged.
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i The concentrations of all isotopes were measured at the plant and were within Weekly composite samples of all the 10 CFR 20 values at the site boundary.
test tank discharges were sent to an off-site laboratory for analyscs of low level gamma emitters, SR-89 and 90, gross alpha and tritiu n analyses.
will be comparef with the The results of the off-site laboratory analyses plant analyses.
A flow sensing device with indication and alarm capability has been ordered and will be installed in the river effluent radiation monitoring system pump The flow sensing device will alert the Operator to a loss of sample line.
sample flow and in fact is expected to have the capability to close the waste Additionally, a liquid effluent control valve upon loss of sample flow.second radiation line, thus negating the need for a sample cump.
In the interim period, before the flow device and the second monitor are installed a notice was posted at the electrical breaker cabinet to alert the Operator to the dual function performed by the electrical breaker feeding the Incore Flux Drive System.
March 1, 1978 and the The flow sensing device will be installed on or before second radiation monitor should be in service on or before June 1,1978.
With the design changes and the interim administrative controls in effect it is not expected that this situation will recur.
Very truly yours, l
Richard H. Graves Plant Superintendent RHG:HHW/jhb (17)
Direr.ior, Office of Nuclear Reactor Regulation, Washington, D. C.
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