ML19241A982: Difference between revisions
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. .s ~9 U. S. NUCLE AR mtcut Atomy coa,nsissi | . .s ~9 U. S. NUCLE AR mtcut Atomy coa,nsissi | ||
. wpejopass x4 D Ill 1.lCENSEE EVENT REPORT EXHIBIT (Ptt Ast raiNT om Tvrt ALL atovinto sN7ormeATioht CONTaot stoCC: 1 l l l I ! .Ih Q l .F.l L; s,cis.u q R) cou Pi 3 lg,l 0 j 0 ;- l 0 i 01 0l 0 0 | . wpejopass x4 D Ill 1.lCENSEE EVENT REPORT EXHIBIT (Ptt Ast raiNT om Tvrt ALL atovinto sN7ormeATioht CONTaot stoCC: 1 l l l I ! .Ih Q l .F.l L; s,cis.u q R) cou Pi 3 lg,l 0 j 0 ;- l 0 i 01 0l 0 0 | ||
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con v g', [ LQI 0 l 5l 0 ci a,;-10 31 01 2 gl oe. i nii.s,1r o i 71 gg' 019 aecar l11 care 'J 7 l 8l@ | |||
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g ; At 1740, inverter VBIT-1A failed causing the loss of power to the 120 volt | g ; At 1740, inverter VBIT-1A failed causing the loss of power to the 120 volt | ||
, A.C. vital bus 3-A. This caused DHV-3, decay heat removal outlet valve, te | , A.C. vital bus 3-A. This caused DHV-3, decay heat removal outlet valve, te y | ||
close, isolating decay heat removal. Redundancy was maintained with the | |||
,, , auxiliary power supply to vital bus 3-A. This is the second occurrence t,m_ j W, , ; of inverter VBIT-1A failure. No effects upon public health and safety sinc i] g , decay heat . ras minimal and auxiliary power was available within five minutc _ | |||
,, , auxiliary power supply to vital bus 3-A. This is the second occurrence t,m_ j | r-7g l | ||
W, , ; of inverter VBIT-1A failure. No effects upon public health and safety sinc | |||
r-7g | |||
l | |||
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oCC.S.!Mg ag. g, Af os 38 MS 4 | |||
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Line 68: | Line 46: | ||
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l . [_A_J@! Operator observation | |||
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, _ _x __ | , _ _x __ | ||
. a - ,e _--- , - ,__ ,,a SUPPLEMENTARY INFORMATION | |||
. a - ,e _--- , - ,__ ,,a | |||
SUPPLEMENTARY INFORMATION | |||
: 1. Report No.: 50-302/78-042 /03L-0 | : 1. Report No.: 50-302/78-042 /03L-0 | ||
: 2. Facility: Crystal River Unit #3 | : 2. Facility: Crystal River Unit #3 | ||
Line 135: | Line 84: | ||
At 1740, the duel input inverter, VBIT-1A failed, causing the loss of power to the 120 volt A.C. Vital Bus 3-A. As a result of this power loss, a closing circuit to DHV-3, decay heat removal outlet valve, was energized, thus isolating the decay heat removal system. An auxiliary power source, utilizing the isolation power supply VBTR-3A, was placed into service to provide power to Vital Bus 3-A. The initial conditions for decay heat removal were re-established and the system was returned to full operability within fifteen minutes. | At 1740, the duel input inverter, VBIT-1A failed, causing the loss of power to the 120 volt A.C. Vital Bus 3-A. As a result of this power loss, a closing circuit to DHV-3, decay heat removal outlet valve, was energized, thus isolating the decay heat removal system. An auxiliary power source, utilizing the isolation power supply VBTR-3A, was placed into service to provide power to Vital Bus 3-A. The initial conditions for decay heat removal were re-established and the system was returned to full operability within fifteen minutes. | ||
: 7. Dasignation of Apparent Cause: | : 7. Dasignation of Apparent Cause: | ||
The cause of this event was due to electronic _ component failures within inverter | The cause of this event was due to electronic _ component failures within inverter VBIT-1-A. - | ||
VBIT-1-A. - | |||
: 3. Analysis of Occurrence: | : 3. Analysis of Occurrence: | ||
There was no safety hazard to the plant or general public as decay heat was minit; due to the fact that the plant was shut down for an extended period and auxiliary power was available within five minutes. , | There was no safety hazard to the plant or general public as decay heat was minit; due to the fact that the plant was shut down for an extended period and auxiliary power was available within five minutes. , | ||
Line 147: | Line 94: | ||
[ h ;5 t/N | [ h ;5 t/N | ||
- . . a .- , - - | - . . a .- , - - | ||
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Florida 15 Septe=ber 1978 3-o -1 c 3.o.o a a n 2 ~P wer CS-78-190 Mr. J. P. O'Reilly, Director Docket No. 50-302 U.S. Nuclear Regulatory Commission Licensee No. DPR-72 Office of Inspection & Enforcement LER No. 78-042/03L-0 101 Marietta St., Suite 3100 Crystal River Unit #3 Atlanta, CA 30303 Occurrence Date: | Florida 15 Septe=ber 1978 3-o -1 c 3.o.o a a n 2 ~P wer CS-78-190 Mr. J. P. O'Reilly, Director Docket No. 50-302 U.S. Nuclear Regulatory Commission Licensee No. DPR-72 Office of Inspection & Enforcement LER No. 78-042/03L-0 101 Marietta St., Suite 3100 Crystal River Unit #3 Atlanta, CA 30303 Occurrence Date: | ||
Line 166: | Line 109: | ||
Very truly yours, FLORIDA POWER CORPORATION | Very truly yours, FLORIDA POWER CORPORATION | ||
- 0 LO, - | - 0 LO, - | ||
,T otd W. P. Stewart Director, Power Production GMW/rc | ,T otd W. P. Stewart Director, Power Production GMW/rc Nuclear Plant Manager Attach: (2) .. | ||
Nuclear Plant Manager Attach: (2) . | |||
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6 kl 423 g ne mor?re f yt , | 6 kl 423 g ne mor?re f yt , | ||
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Latest revision as of 03:04, 2 February 2020
ML19241A982 | |
Person / Time | |
---|---|
Site: | Crystal River |
Issue date: | 09/11/1978 |
From: | Cooper J FLORIDA POWER CORP. |
To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
References | |
LER-78-042-03L, LER-78-42-3L, NUDOCS 7907110490 | |
Download: ML19241A982 (2) | |
Text
.
/:... c ' *h
. .s ~9 U. S. NUCLE AR mtcut Atomy coa,nsissi
. wpejopass x4 D Ill 1.lCENSEE EVENT REPORT EXHIBIT (Ptt Ast raiNT om Tvrt ALL atovinto sN7ormeATioht CONTaot stoCC: 1 l l l I ! .Ih Q l .F.l L; s,cis.u q R) cou Pi 3 lg,l 0 j 0 ;- l 0 i 01 0l 0 0
- 0 i 0a g 4 ; 1;119 g lg ,,;., ujg
.. , s ,a ~ u - . . . 2. s...su ... a con v g', [ LQI 0 l 5l 0 ci a,;-10 31 01 2 gl oe. i nii.s,1r o i 71 gg' 019 aecar l11 care 'J 7 l 8l@
8 a $2_ .. . a r s ,. . . . . - :4re u >, sa tvENT of stwTioN 48o enes Asta CosstoutsCas @
g ; At 1740, inverter VBIT-1A failed causing the loss of power to the 120 volt
, A.C. vital bus 3-A. This caused DHV-3, decay heat removal outlet valve, te y
close, isolating decay heat removal. Redundancy was maintained with the
,, , auxiliary power supply to vital bus 3-A. This is the second occurrence t,m_ j W, , ; of inverter VBIT-1A failure. No effects upon public health and safety sinc i] g , decay heat . ras minimal and auxiliary power was available within five minutc _
r-7g l
' C O* *. v.tse METil $* s,t u. Caust Ca it e
C006 CC;8 lbl*C:t Co'.*.os t s: 03 3t Sus:C t Swa:::t e un f .E 3.. u o .. i, a oCC.S.!Mg ag. g, Af os 38 MS 4 ssf%7vtae S mgt o.'.'L oaf s*0T I A L CC E * .t g3 e7 4
=;
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1 0101 Of 01 z ,. .a W@ lN!@
., .s lNl@
u .
"IN CAL /St Ot5;*I87 ton ANo CC AmtCfl\ ! ACTIONS h
[iGy . c. l Cause of this event was due to electronic component failures within the CJ ,, ; inverter VBIT-1A. The inverter is presently undergoing rectifier modific 5.i k W ,,, , tions to improve reliability.
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, ns, 604)7"5-64E5 77 o 7 (I C 'f '70
, _ _x __
. a - ,e _--- , - ,__ ,,a SUPPLEMENTARY INFORMATION
- 1. Report No.: 50-302/78-042 /03L-0
- 2. Facility: Crystal River Unit #3
- 3. Report Date: 11 September 1978
- 4. Occurrence Date: 19 August 1978
- 5. Identification of Occurrence:
Less than one operable decay heat removal loop contrary to Technical Specificatior 3.9.8.
- 5. Conditions Prier to Occurrence:
Mode 6 refueling.
- 6. Description of Occurrence:
At 1740, the duel input inverter, VBIT-1A failed, causing the loss of power to the 120 volt A.C. Vital Bus 3-A. As a result of this power loss, a closing circuit to DHV-3, decay heat removal outlet valve, was energized, thus isolating the decay heat removal system. An auxiliary power source, utilizing the isolation power supply VBTR-3A, was placed into service to provide power to Vital Bus 3-A. The initial conditions for decay heat removal were re-established and the system was returned to full operability within fifteen minutes.
- 7. Dasignation of Apparent Cause:
The cause of this event was due to electronic _ component failures within inverter VBIT-1-A. -
- 3. Analysis of Occurrence:
There was no safety hazard to the plant or general public as decay heat was minit; due to the fact that the plant was shut down for an extended period and auxiliary power was available within five minutes. ,
- 9. Corrective Action:
Inverter VBIT-1A is presently unde rgoing rectifier modifications to improve reliability.
- 10. Failure Data:
This is the second occurrence of inverter VBIT-1A failure as reported by LER 77-1_
/rc
[ h ;5 t/N
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- - - - - = = = _ - -. - r-78-084
) 9 ,
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Florida 15 Septe=ber 1978 3-o -1 c 3.o.o a a n 2 ~P wer CS-78-190 Mr. J. P. O'Reilly, Director Docket No. 50-302 U.S. Nuclear Regulatory Commission Licensee No. DPR-72 Office of Inspection & Enforcement LER No. 78-042/03L-0 101 Marietta St., Suite 3100 Crystal River Unit #3 Atlanta, CA 30303 Occurrence Date:
19 August 1978
Dear Mr. O'Reilly:
Enclosed please find Licensee Event Report 78-042/03L-0 and the attached supplementary sheet, which are submitted in accordance with Technical Specification 6.9.1.9.b.
Should there be any questions, please contact us.
Very truly yours, FLORIDA POWER CORPORATION
- 0 LO, -
,T otd W. P. Stewart Director, Power Production GMW/rc Nuclear Plant Manager Attach: (2) ..
- }
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1 Q*()(; m3 01 o*