ML19347B630
| ML19347B630 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 10/08/1980 |
| From: | Graves R CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RO-80-07, RO-80-7, NUDOCS 8010150465 | |
| Download: ML19347B630 (3) | |
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CONNECTICUT YANKEE AT O M I C POWER COMPANY 4, /
y HADDAM NEC' PLANT i
RR # 1. BOX 127E. EAST H AMPTON. CONN. 06424 October 8,1980 4
U. S. Nuclear Regulatory Commission Region I Office of Inspection and Enforcement i
631 Park Avenue King of Prussia, Pennsylvania 19406 l
Attn:
Mr. Boyce Grier, Director
Reference:
Facility Operating License No. DPR-61 Docket No. 50-213 ETS-NR/50-213/80-07
Dear Mr. Grier:
j l
On September 26, 1980, at 10:55 AM an unplanned radioactive gas release occurred when a Chemistry Technician opened the wrong valve while
' obtaining a menthly sample. The evaluation determined the release to be in excess of Environmental Technical Specifications, Section j
2.4.3.1(1).
This release was reported by telephone September 26, 1980 l
at 2:43 PM as required by Connecticut Yankee Environmental Technical Specifications.
A written response containing a detailed description as required by Environmental Tec.hnical Specifications, Section 5.6.2. A(1) is attached.
l Please note this report is forwarded past the ten day reporting i
requirement.
The report writer was mistakenly using the Saf ety Technical Specifications 14 day reporting requirement. Please destroy Reportabic Occurrence LER 80-13/.1P dated September 29, 1980.
Very truly yours,
!Df
//w Richard 11. Graves Station Superintendent RilG:RPT/jhb Dir., Office of Nuclear Reactor Regulations, Washington, D. C.
(17) cc:
USNRC, c/o Document Management Branch, Washington, D. C.
(1) 801015 0W,5 4
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On September 26, 1980, at 10:55 MI, a Chemistry Technician opened valve 985B instead of valve 985A (See attached sketch). This allowed gas to be released from the Volume Control Tank (VCT) instead of the pressurizer relief tank. This caused 1.3 curies of gas to be released to the atmosphere via the main stack over a period of three minutes.
The Technical Specification instantaneous releasr *in.it for noble gases was exceeded by a factor of 3.38.
Calculated total ext. sure at the site boundary was.0003 MR.
The Technicians pocket dosimeter showed 9 MR, this included his work from 7:00 Mi that morning.
The results of a whole body count showed he received no internal exposure.
Written procedures clectly state how the sample is to be taken and the valves are clearly marked and are separated by approximately 2h feet in elevation.
The Technician was following the prbcedure correctly until he opened the wrong valve.
It is apparent that the Technician did not use enough ca're in reading the tags and misread 985B and 985A.
It is felt that a fully qualified Technician should be aware that there are other sample lines in the immediate vicinity which sample arcas such as the VCT which are much " hotter" than the pressurizer relief tank (PRT) and that care should be used.
The Technician stated he was aware.f this and that he did not rush, however he misread the tag.
The Operations Department has red tag closed and tie wire locked the following
" valves, 984B and 985B, also 980 and 979 (see attached sketch).
The 980 and 979 valves are on the charging pump sample line and the VCT sampic lines are not normally used during operation.
In addition to the above, Connecticut Yankee will revise the procedures for the VCT and charging pumps samples to add a precaution that " hot" gases are involved.
On a longer term basis we will study the possibility of having all present sample lines directed into the vaste gas system.
The Technician was instructed to use more care in this area specifically, and da general was counseled on the implications of his actions.
Disciplinary action was taken.
It is felt that the actions stated in the aMvc paragraphs shnuld prevent tiiis f rom happening again.
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