ML20042A057
| ML20042A057 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 02/04/1982 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| DP-82-27, NUDOCS 8203230031 | |
| Download: ML20042A057 (2) | |
Text
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MAR 2 21982w -t February 4, 1982 n mm rna m EP-82-27 mur rem 9
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Mr. John T. Collins, Administrator U. S. Nuclear Regulatory Commission
((g glgg Region IV 611 Ryan Plaza Drive 3
Suite 1000 Arlington, Texas 76011
Dear Mr. Collins:
Subject:
Written Summary - Notification of Unusual Event The Omaha Public Power District's Fort Calhoun Station declared a
" Notification of Unusual Event" at 5:45 p.m. on February 3,1982.
The initiating condition was an indication of exceeding a radiological effluent technical specification limit.
The release of radioactive gas through the plant ventilation stack occurred simultaneously with the sampling of volume control tank gases by a Chemistry / Radiation Pro-tection Technician.
The duration of the plant release was approximately three (3) minutes. At 9:39 p.m., the " Notification of Unusual Event" emergency condition was officially terminated by verbal sum:ary to:
(1) the U. S. Nuclear Regulatory Commission, Region IV; (2) the State of Nebraska, State Civil Defense Agency; and (3) the State of Iowa, Office of Disaster Services.
A sequence of significant events and evaluations in chronological order was as follows:
1.
Ventilation isolation actuation signal initiated with high alarm on RM-061, " Stack Radiation Monitor".
2.
Emergency Procedure EP-11, "High Radioactivity", activated by Operations Group.
3.
Auxiliary building ventilation secured.
4.
Notification of Unusual Event emergency condition declared.
5.
Radiological Emergency Response Plan initiated, Emergency Organization activated, and Operations Support Center staffed.
6.
U. S. Nuclear Regulatory Commission, State of Nebraska, and
/f State of Iowa notified of emergency classification.
7.
In-plant radiological surveys indicate low level airborne f
activi ty.
Particulate concentration was 1.04 E-10 microcurie
--'- -"" centimeter, pp 8203230031 820204 PDR ADOCK 05000285 S
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Mr. John T. Collins EP-82-27 Page Two 8.
Offsite dose assessment performed with the following results:
a.
The instantaneous release rate of noble gases was 1.81 E+03 microcurie per second or 2.1% of the applicable Technical Speci fication.
b.
The instantaneous release rate of particulates was 58.9%
of the applicable Technical Specification.
c.
The maximum dose rate at the site boundary was 0.25 mrem /hr.
d.
The total whole body exposure for a person at the site boundary for this event would have been 0.012 mrem.
9.
Offsite survey of airborne activity showed all sample media at normal background levels.
- 10. The Emergency Recovery Manager tenninated the emergency classi-fication and all operation declared nonnal.
11.
U. S. Nuclear Regulatory Commission, State of Iowa, and State of Nebraska officially notified by verbal summary of closeout.
The Omaha Public Power District is continuing to review the events leading to the emergency condition.
Sincerely, L C & uD
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A /#. G.
W. C.
es Division Manager Production Operations WCJ/KJM/FFF:jmm cc: LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N.W.
Washington, D.C.
20036 i