ML19309F904
| ML19309F904 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 03/17/1980 |
| From: | Counsil W, Fee W CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | Brunner E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML19309F902 | List: |
| References | |
| NUDOCS 8005010612 | |
| Download: ML19309F904 (3) | |
Text
$
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BERLIN. CONNECTICUT P.O. BOX 270 H ARTFORD. CONNECTICUT 06101 Tatsenons 203-669-6911 March 17, 1980 DOCKET No. 50-213 U. S. Nuclear Regulatory Commission Region 1 Office of Inspection and Enforcement 631 Park Avenue King of Prussia, Pennsylvania 19406 Attn:
Mr. Eldon J. Brunner, Chief Reactor Operations and Nuclear Support Branch
Reference:
Letter, E. J. Brunner to W. G. Counsil, dated February 25, 1980 Inspection 50-213/79-21
Dear Mr. Brunner:
Pursuant to Section 2.201 of the Nuclear Regulatory Commissions (NRC's)
" Rules of Practice", Part 2, Title 10, Code of Federal Regulations, the following information concerning an item identified by Connecticut Yankee Atomic Power Company and subject of inspection 50-213/79-21 is hereby submitted.
Infraction Environmental Technical Specification (ETS) 2.4.3.l(1) limits the release rate of noble gases from the site based upon the beta and gamma energies of the isotopic mix being released.
Contrary to the above requirements, on December 16, 1979, a noble gas mixture was released which exceeded the ETS 2.4.3.1(1) limit by a factor of 5.2 for a period of 10 minutes.
Response
Contamination on roof has been scaled down by application of asphalt base sealant.
The roof drains have been flushed and cleaned to acceptable levels.
The area around the base of the stack has been decontaminated, sealed and painted.
The storm sewers have been cleaned and are being monitored. The Stack drain system has been cleaned so that the stack will drain to the plant contaminated drain system.
t A high level trip feature has been added to the degasifier controls so that a high level in the degasifier will trip the primary drain tank transfer pumps and sound an alarm.
Additional shutoffs and alarms are being investigated to provide more redundancy.
A radiation monitor has been added to the primary vent stack duct further down stream from the point where the relief line enters the duct.
A procedure for response to alarm from this monitor has been written and approved by the Plant Operations Review Committee.
The detector has been provided with adequate shielding to assure accurate readings. The Radiation Monitoring Systems are in the process of an engineering review.
A liquid indicator will be added to the stack base. This will indicate whenever any liquid has carried into the stack base. The drain system in the stack base is being reviewed for possible upgrading.
An engineering evaluation of radioactive effluent systems has been conducted which concludes:
" Uncontrolled releases of gaseous, and possibly liquid, radioactivity, are possible when overpressure protection devices provided for the degasifier, the waste gas decay tank, and the steam generator blow off tank are actuated.
Uncontrolled liquid releases are possible from potentially contaminated drains which are routed to clean systems.
Control of gaseous releases can be obtained by utilizing relief valves in lieu of rupture discs and by routing vents to system tanks for containment of any discharges.
Control of liquid releases can be attained by plugging any potentially contaminated drains which flow to clean systems."
After conceptual approval, budget approval and design change approval the recommendations for the station radioactive systems will be implemented as appropriate.
The following administrative actions have been taken:
-The Radiation Monitoring Systems operational procedures have been reviewed and clarified where appropriate.
-Additional instruction on the Radiation Monitoring System has been added to the operator initial training and retraining programs.
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-More emphasis is being placed on non ra ioact ve systems and radioactive waste systems training in initial operator training and annual retraining programs.
Connecticut Yankee Atomic'. Power Company is now in full compliance.
Very truly yours, CONNECTICUT YANKEE ATOMIC POWER COMPANY h'd;C W. G. Counsil Vice President By:
W. F. Fee Vice President l
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