ML20151Y350
| ML20151Y350 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 09/19/1977 |
| From: | Flack E, Higginbotham L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-77-163, NUDOCS 9809180209 | |
| Download: ML20151Y350 (1) | |
Text
._ __.. _.
_Q {}((
C<)VMLU Q1 f
] / AV}"
V 2
PRELIMINARY NOTIFICATION i
September 19, 1977 l
PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-77-163 i
This )reliminary notification constitutes EARLY notice of an event of
' I" '
' POSSI3LE safety or public interest significance.
The information presented is as initially received without verification or evaluation 1
i and is basically all that is known by IE staff on this date.
Facility: Connecticut Yankee Atomic Power Company HaddamNeckPlant(DN50-213)
Haddam Neck, Connecticut l
Subject:
UNPLANNED RELEASE OF RADI0 ACTIVE MATERIAL At 5:10 a.m., on September 18, 1977, a waste gas tank rupture disc failed while the tank wes being filled, resulting in a monitored, unplanned release of radioactive material to the environment. The release was secured at 5:21 a.m., by isolating the tank.
The release consisted of isotopes of Xenon, Krypton, and Argon. The 1
maximum release rate of 11,300 microcuries per second exceeded the
. Technical Specification allowable rate for this mixture of 9,960 microcuries per second. Only one isotope Xe-133, exceeded the 10 CFR..
gmj g 20concentrationlimitof3x10-7myrocu,riespercubiccentimeterwith an actual concentration of 3.22 x 10 microcuries per cubic centimeter Cp Total activity released was 7.44 Curies f
Media interest is expected because of close attention given to releases 2) of radioactive material to the environment. The State of Connecticut A:
has been informed. The licensee plans to notify news media today.
O d
NRC, Region I, (Philadelphia) received notification of this occurrence
+
by telephone from the Assistant Plant Superintendent at 3:30 p.m.,
%m September 18, 1977. This information is current as of 8:30 a.m._,
September 19, 1977.
_g
-Contact:
EDFlack, IE x25188 LBHigginbotham, IE x27347 I
Contact 6fstribution:
Transmitted H St 12.lo0; p
tiairman Hendrie Commissioner Bradford Comissioner Kennedy S. J. Chilk, SECY C. C. Kammerer, CA Q
Commissioner Gilinsky (ForDistribution) p.,
-Transmitted: MNBB-/ M O lo P Bldg,u //
E. Volgenau IE L
L. V. Gossick, EDO E. G. Case, NRR Region i p. ; 2.0 S. H. Hanauer, EDO e
J. J. Fouchard, PA i,i.3 p,O, SS Bldg II: />
(MAIL) n.a.
W. G. Mcdonald, MIPC C. V. Smith, NMSS R. J. McTiernan, 0IA R. G. Ryan, OSP R. Minogue, SD H. K. Shroar_ n n PRFlIMINaDV NATiritTrinu
.