PNO-I-80-166, on 801116,plant Emergency Declared Upon Receipt of Radiation Alarm During Transfer of Spent Resin from Deborating Ion Exchanger.Caused by Partially Open Discharge Valve.Max Noble Gas Release Was 9% of Limit
| ML19343B014 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 11/17/1980 |
| From: | Brunner E, Knapp P, Mccabe E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| References | |
| PNO-I-80-166, NUDOCS 8011240468 | |
| Download: ML19343B014 (1) | |
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PRELIMINARY NOTIFICATION Date: November 17, 1980 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I 166 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or puolic interest significance.
Tne information oresented is as initially received without verification or evaluation and is basically all tnat is known by IE staff on this date.
dd i tHaore bas & Electric Company Facility:
Calvert Cliffs, Unit 2 Lusby, Maryland (CN 50-317)
Subject:
UNPLANNED fl0BLE MS RELEASE About 11:25 a.m., November 16, 1980, a plant emergency was declared when 3 radiation alarms were received while spent resin was being transferred from a deborating ion exchanger.
The problem was found to be a discharge valve on an on-line CVCS purification ion excha'nger, with that valve indicating shut but being slightly open because of binding of its position indicator, resulting in discharge from the hotter, on-line ion exchanger as well as from the deborating ion exchanger.
The discharge was secured when the alarms were received.
Conditions returned to normal and the plant emergency was declared over by 12:30 p.m.
The maximum noble gas release rate was about 9% of the instantaneous limit.
The licensee made a press release. fledia interest has occurred.
No NRC nress release is planned.
Region I will respond to media inquiries.
The State of fiaryland has been informed.
An ENS report was made to the NRC Duty Officer about noon, November 16.
The Senior Resident Inspector was informed about 12:25 p.m., November 16.
Contact:
E. C. ?!cCabe, Jr.
488-1251 P. il. Knaco 488-1291 Prepared by EXT Section Cnief EXT M
E. J. Brunner 488-1240
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Branch Chief EXT 7,
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PRELIMINARY NOTIFICATION Region I Form 83a (Rev. January 1980) ggyNN
o PN0-I-80-166 2
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