View source for PNO-I-97-049, on 970807,inadvertent Actuation of Halon Sys Occurred Affecting CR & Adjacent Central Alarm Station. Personnel Took Photographs of Panel of Halon Actuation Panel,Prior to Actuation.Root Cause of Actuation Evaluated

{{Adams
| number = ML20198F880
| issue date = 08/08/1997
| title = PNO-I-97-049:on 970807,inadvertent Actuation of Halon Sys Occurred Affecting CR & Adjacent Central Alarm Station. Personnel Took Photographs of Panel of Halon Actuation Panel,Prior to Actuation.Root Cause of Actuation Evaluated
| author name = Conte R, Raymond W
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION I)
| addressee name = 
| addressee affiliation = 
| docket = 05000213
| license number = 
| contact person = 
| document report number = PNO-I-97-049, PNO-I-97-49, NUDOCS 9708130174
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 2
}}
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                                                      '                  August  8, 1997 ERELIMIEABI_KQTH I.93 TION OF EVENT OR' UNUSUAL OCCUPDMNCE-PNO-I-97-049
  -This -preliminary: notification constitutes EARLY notice of events of POSSIBLE-
'feafety;or public interest--significance. The information is~as initially recaived without verification or evaluation, and-is basically all that is knowniby-Region I staff in King of Prussia, Pennsylvania on this date.
u Facility                       _
Licensee Emeroency Classification     j Connecticut Yankee Atomic Power Co.                          X Notification of Unusual-Event       j L Haddam Neck.1                                                    Alert-Hartford, Connecticut Site Area Emergency LDockatsif50-213                                                 General Emergency Not 7@plicable

==Subject:==

L CONTROL ROOM EVACUATION DUE TO INADVERTENT RALON ACTUATION -
MEDIA' INTEREST On' August 7,_1997 at 9:47 a.m., an inadvertent: actuation of the halon
  - cystem occurred af fecting the control room- (CR) and the adjacent central alarm station-(CAS). Within 6 minutes, personnel evacuated those areas.
The secondary alarm station (SAS) functioned to fully back up CAS. After-ventilatingithe control room and airiquality was assessed as satisfactory, operators, returned to the CR at about 10:34 a.m. Based on-conservative judgement, the shift manager declared an Unusual-Event at 710:45 a.m.-                After-stable conditions.were reverified-in the control room, and in consultation with plant management, plant operators exited from
  -.the Unusual Event at 12:35 p.m.                   There were no injuries.
Just prior to the actuation, personnel were taking photographs of the penal-of the halon actuation panel. After the discharge, the halon bank -
was declared' inoperable and a_ fire watch was initiated in the CR as a by :theilicensee's event -The             rootteam.
cause of the actuation is being evaluated compensatory measure.
review LPrior to CR evacuation,-the shift manager confirmed there was no fire.
During the evacuation period, operators gathered in an adjacent room with a-window and were able to observe the control room panels. While operators =were in the adjacent room, the CAS operator re-entered the CAS iniself- contained breathing apparatus (SCBA) by 10:09 a.m._ An operator Lwithout-:'SCBA briefly re-entered the CR at times to respond to-alarms as-they occurred. 'The licensee reported no effect on spent fuel pool
  -cooling, service water, electrical distribution and radiation monitoring.
There was no significant equipment-damage.
JTha resident inspector responded to the site. The State of Connecticut
  .was. notified by both the licensee and. Region I. The licensee issued a press release. A Commissioner Technical Assistants briefing was conducted at 3:00 p.m.
  !Region I initially received notification of the event from the Senior
  -Resident Inspector at 10:30-a.m.,-August 7, 1997.                                            %
9700130174 970008                                                    ' .[L PDR      IhE PNO-I-97-049      PDR      ,,
L                 100080

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The information-_ presented herein has-been discussed with the licensee, cnd-is current as of-4:00 p.m., Thursday, August 7, 1997.
Contcet:           RAYMOND,. WILLIAM                   CONTE, RICHARD (203)267-2571                     (610)337-5183 I
i
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