PNO-I-98-033, on 980728,licensee Identified Leak of Approximately 1,000 Gallons of Demineralized Water & Chemical Agents Used for Decontamination of Plant Sys.Region I Radiation Specialist Will Be Onsite to Review Licensee

PNO-I-98-033:on 980728,licensee Identified Leak of Approximately 1,000 Gallons of Demineralized Water & Chemical Agents Used for Decontamination of Plant Sys.Region I Radiation Specialist Will Be Onsite to Review Licensee

ML20236U200
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	07/28/1998
From:	Joseph Nick, William R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-98-033, PNO-I-98-33, NUDOCS 9807290377
Download: ML20236U200 (1)

July 28, 1998 PR[ LIM'I Y NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-I-98-033

- This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or. public interest significance. The information is as initiallyreceived without known by Region I staff in King of Prussia. Pennsylvania on this date.

Facility _ Licensee Emeraency Classification Connecticut Yankee Atomic Power Co. Notification of Unusual Event Haddam Neck 1 Alert East Hampton. Connecticut Site Area Emergency Dockets: 50-213 General Emergency

, X Not Applicable

Subject:

LEAK DURING REACTOR SYSTEM CHEMICAL DECONTAMINATION With the plant permanently shutdown for decommissioning and the reactor defueled, the licensee identified a -leak of approximately 1.000 gallons of demineralized water and chemical agents used for decontamination of plant systems. The leak was limited to a small section of the floor in the lower level of the Primary Auxiliary Building (PAB). with the remainder of the solution captured in the floor drain system. The licensee had recently initiated a chemical decontamination of the reactor coolant system (RCS). A portion of the leak was detected on the floor of

, .the lower level of the PAB and was attributed to a failure in an instrument line in the letdown system. Based on the volume added to the aerated drain tank-(ADT). the licensee also suspected another source of a leak that went to the floor' drains or sumps, which em A search for another source of leaks was in progress.pty into the ADT.

The letdown system was isolated from the reactor coolant system which stopped the leak. The reactor coolant system chemical. injection was

< discontinued until the leaks could be repaired. There were no )ersonnel

' contaminations resulting from the spill. A vendor cleaned up t1e water containing chemicals from the decontamination process. No radioactive contamination from the spill was identified outside the building and effluent monitors did not indicate any liquid or gaseous release to the

environment. Due to the RCS decontamination in progress, the contaminated water contained higher than normal radioactivity, but was

.less than 10 Curies of total estimated radioactivity. A press release was! issued by the licensee.

I The Senior Resident Ins)ector is onsite and will continue to monitor the i licensee's actions. A Region.I Radiation Specialist will be onsite to review the licensee's radiation protection controls.

'The! State of Connecticut has been informed of the contents of this i

report.

Region I Public Affairs is prepared to respond to media inquiries.

This information is current as of 10:00 a.m. on July 28. 1998.

Cortact: Raymond. William Nick. Joseph

. (860)267-2571 (610)337-5056 h 1 ,

9807290377 990728 ,

PDR I&E PNO-I-98-033

.,y PDR ze[

,,,y.,