ML17312A779
| ML17312A779 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 05/23/1996 |
| From: | Barrett R NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Bernard Thomas INTERNATIONAL ATOMIC ENERGY AGENCY |
| References | |
| NUDOCS 9605290100 | |
| Download: ML17312A779 (6) | |
Text
Mr-'-." Bernard Thomas INES Coordinator Division of Nuclear Safety International Atomic Energy Agency Wagramerstrasse 5
P.O.
Box 100 A-1400 Vienna Austria Nay 23, l996 5o-52)
Dear Mr. Thomas:
Enclosed is a completed Event Rating Form for an event at Palo Verde, Unit 2.
The event involved a fire in an electrical panel in the control room and another fire in the Train "B" DC equipment room.
This event is considered "below scale/level 0" based on Paragraph III-2.10 and Part III Table II of the INES User's Manual.
Full safety system operability was in effect during and after the event.
Sincerely,
~~~<>@ <genoa a@-
Richard J. Barrett, Chief Emergency
Response
Branch Incident Response Division Office for Analysis and Evaluation of Operational Data
Enclosure:
As stated bcc w/encl:
Angelina S.
- Howard, INPO Distribution:
IRD R/F IRB R/F File Center Public EJordan DRoss LSoffer CStoiber WUpshaw DISK/DOCUMENT NAME: a:ghoosllpaloverd.96 To receive a copy of this document, indicate in the born "C" - Copy w/o attachment, "E" - Copy wtattachment, "N" -
o copy OFC NAME DWeaver DATE 5/
/96 HBai1 ey 5
/96 AEOD:ERB 6
AEOD:ERB E
D RPW E
e sam 5
96 EDO VMcCree 5Q/96 RB 5/2r/96 OFC D:AEOD: IRD NAME FJCongel DATE 05/2P/96
~qopog423 9605290100 960523 PDR ADOCK 0500052'Br P
PDR IBC RI,E CAN~~y
THE INTERNATIONALNUCLEAR EVENT SCALE (INES)
EVENT RATING FORM (ERF)
TO BE SENT TO THE IAEAINES COORDINATOR BY
~ FAX:+ 431206020723
~ PHONE: + 43 1 2060 22685 IAEA.WAGRAMERSTRASSE 5. P.O. BOX 100, A 1400 VIENNA,AUSTRIA
~ E.MAlLTHOMASONEPOl.lAEA.OR.AT EVENT TITLE ELECTRICAL FIRE IN THE CONTROL ROON EVENT DATE 04.04.96 RATING RAllNG DATE g)VISIONALP 29.04.96 OUT OF SCALE BELOW SCALE 0
ON SCALE 1
2 3
4 5
6 7
SAFETY ATTRIBUTE DEGR. DEFENCE INC)EPTH ON~ IMPACT OFF~ IMPACT COUNTRY FACILITY NAME PALO VERDE, UNIT2 FACILITY TYPE ASPECTS OF SIGNIFICANCE TO THE PUBLIC:
ACCIDENT o INCIDENT o DEVIATION ~
, RADIOACTIVERELEASES OFF-SITE RADIOACTIVERELEASES ON-SITE WORKERS INJURED BY RADIATION WORKERS INJURED PHYSICALLY PLANT SAFETY IS UNDER CONTROL THE EVENT REPORTED IS A DISCOVERY OF A DEFICIENCY BY ROUTINE SURVEILLANCE A PRESS RELEASE WAS MADE (IF YES, PLEASE ATTACHIT)
YES o
0 NO SHORT DESCRIPTION OF THE EVENT: On April4, 1996, Palo Verde 2 experienced fires in two separate areas as a result ofa single initiating event.
Specifically, a fault in an improperly grounded essential lighting system isolation transformer caused fires in the control room and the Train nBn DC equipment room. The first fire involved the essential lighting distribution panel and the control room emergency lighting uninterruptible power supply located in the control room on elevation 140'-0".
This fire created a smoke condition in the main control room behind the main control boards.
The smoke layer extended down from the ceiling to a level just above the tops ofthe control panels.
The smoke did not cause a control room evacuation.
The licensee used the control room HVACsystem in its smoke removal mode to clear the control room. The second fire involved the isolation transformer panel located in the Train "Bn DC equipment room on control building elevationl00'-0".
Both fires were detected by the plant fire detection system and plant personnel in the control room. The site fire de artment rom tl res onded and extin ished these fire.
JUSTIFICATION OF THE RATING: Using the guidance in paragraph III-2.10 this event is rated at level zero/below scale.
Paragraph III-2.10 refers to Table IIin Part IIIofthe INES User's Manual. The rating is obtained by entering the table in the row for Full safety function availability (cooling the radioactive material). This safety function remained "fully"available throughout this event.
Since the hazard itself(the fire) is not considered an initiator, a rating oflevel zero is appropriate.
The plant was in a refueling outage at the time ofthis event and all but one fuel assembly had been removed from the core. This rating is confirmed by the guidance contained in section DI-3.1.1. (Degradation ofreactor core cooling) and section III-3.1.2. (Events a6ecting the spent fuel pool) since neither core coolin nor s ent fuel ool coolin was lost.
CONTACT PERSON FOR FURTHER INFORMATION NAME ADDRESS PHONE FAX Richard J. Barrett USNRC Waahin ton DC 20555 301 415-7482 301 816.5151 PLEASE ATI'ACHADDITIONALINFORMATIONON JUSTIFICATION OF THE EVENT RATING AND DIFFICULTIES ENCOUNTERED IF NEEDED Enclosure
C C
CI y
1 f
Hr. Bernard Thomas INES Coordinator Division of Nuclear Safety International Atomic Energy Agency Wagramerstrasse 5
P.O.
Box 100 A-1400 Vienna Austria May 23, l996
Dear Hr. Thomas:
Enclosed is a completed Event Rating Form for an event at Palo Verde, Unit 2.
The event involved a fire in an electrical panel in the control room and another fire in the Train "8" DC equipment room.
This event is considered "below scale/level 0" based on Paragraph III-2.10 and Part III Table II of the INES User's Hanual.
Full safety system operability was in effect during and after the event.
Sincerely, WigRMXaggneg yv--
Richard J. Barrett, Chief Emergency
Response
Branch Incident Response Division Office for Analysis and Evaluation of Operational Data
Enclosure:
As stated bcc w/encl:
Angelina S.
- Howard, INPO Distribution:
IRD R/F IRB R/F File Center Public EJordan DRoss LSoffer CStoiber WUpshaw DISK/DOCUHENT NAHE: a:ihoosipaloverd.96 To receive a copy of this docrxnent, indicate in the box:
"C" - Copy'w/o attachment, "E" - Copy w/attachment, "N" -
o copy OFC AEOD:ERB AEOD:ERB F
D RPW EDO AE NAHE DWeaver DATE 5/
/96 HBailey 5
/96 E
e sam 5
96 VHcCree 5Q/96 RB tt 5/ii/96 OFC NAHE DATE D:AEOD: IRD FJCongel 05/Za/96 OFFICIAL RECORD COPY
THE INTERNATIONALNUCLEAR EVENT SCALE (INES)
EVENT RATING FORM (ERF)
TO BE SENT TO THE IAEAINES COORDINATOR BY
~ FAIL+ 43 1 2080 29723
~ PHONE: + 43 1 2080 22885 IAEA,WAGRAMERSTRASSE 5, P.O. BOX 100, A.1 400 VIENNA,AUSTRIA
~ E.MAIL:THOMASCNEPO1.IAEA.OR,AT EVENT TITLE ELECTRICAL FIRE III THE COHTROL ROON EVERT DATE 04.04.96 RATING RATING DATE g)VISIONALP 29.04.96 OUT OF SCALE BELOW SCALE 0
ON SCALE 1
2 3
4 5
8 7
SAFEIY ATTRIBUTE DEGR. DEFENCE IN-DEPTH ON4lTE IMPACT OFFNffE IMPACT COUNTRY FACILITY NAME PALO VERDE, UNIT2 FACILITY TYPE ASPECTS OF SIGNIFICANCE TO THE PUBLIC:
ACCIDENT a INCIDENT o DEVIATION ~
RADIOACTIVERELEASES OFF-SITE RADIOACTIVERELEASES ON-SITE WORKERS INJURED BY RADIATION WORKERS INJURED PHYSICALLY PLANT SAFETY IS UNDER CONTROL THE EVENT REPORTED IS A DISCOVERY OF A DEFICIENCY BY ROUTINE SURVEILLANCE A PRESS RELEASE WAS MADE (IF YES, PLEASE ATTACHIT)
YES NO SHORT DESCRIPTION OF THE EVENT: On April4, 1996, Palo Verde 2 experienced fires in two separate areas as a result ofa single initiating event.
Specifically, a fault in an improperly grounded essential lighting system isolation transformer caused fires in the control room and the Train nBn DC equipment room. The first fire involved the essential lighting distribution panel and the control room emergency lighting uninterruptible power supply located in the control room on elevation 140'-0".
This fire created a smoke condition in the main control room behind the main control boards.
The smoke layer extended down from the ceiling to a level just above the tops ofthe control panels.
The smoke did not cause a control room evacuation.
The licensee used the control room HVACsystem in its smoke removal mode to clear the control room. The second fire involved the isolation transformer panel located in the Train "Bn DC equipment room on control building elevation100'-0".
Both fires were detected by the plant fire detection system and plant personnel in the control room. The site fire de artment rom tl res onded and extin ished these fires.
JUSTIFICATION OF THE RATING: Using the guidance in paragraph III-2.10 this event is rated at level zero/below scale.
Paragraph III-2.10 refers to Table IIin Part IIIofthe INES User's Manual. The rating is obtained by entering the table in the row for Full safety function availability (cooling the radioactive material). This safety function remained "fully"available throughout this event.
Since the hazard itself(the fire) is not considered an initiator, a rating oflevel zero is appropriate.
The plant was in a refueling outage at the time ofthis event and all but one fuel assembly had been removed from the core. This rating is confirmed by the guidance contained in section III-3.1.1. (Degradation ofreactor core cooling) and section III-3.1.2. (Events affecting the spent fuel pool) since neither core coolin nor s ent fuel oolcoolin was lost.
CONTACT PERSON FOR FURTHER INFORMATION NAME Richard J. Barrett ADDRESS USNRC Washln tcn DC 20555 PHONE 301 415-7452 301 81 6-51 51 FAX PLEASE ATTACH ADDITIONALINFORMATION ON JUSTIFICATION OF THE EVENT RATING AND DIFFICULTIES ENCOUNTERED IF NEEDED
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