ML19329B884: Difference between revisions
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_ICENSEE EVENT REPORT I (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION! | _ICENSEE EVENT REPORT I (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION! | ||
[ CONTROL BLOCK: l | [ CONTROL BLOCK: l | ||
}- l l l \ | }- l l l \ | ||
lh o | |||
lh | H D B S 1 0l0l-l0l0lNlPlFl-l0l3lgl4l1l1l1l1lgl 26 26 Li( ENSE TYPE JO l | ||
$7 CAT 68 l | $7 CAT 68 l | ||
14 15 UGENSE NUMBER LICENSEE CODE | 14 15 UGENSE NUMBER LICENSEE CODE | ||
Line 41: | Line 38: | ||
.0 @ | .0 @ | ||
? 8 OCCURRENCE SEcuENTIAL TvPE No. | ? 8 OCCURRENCE SEcuENTIAL TvPE No. | ||
REPORT No. CCOE LER/Ro EVENT YEAR l111l6l l/l l 01 3l l Ll l-l l Ol | REPORT No. CCOE LER/Ro EVENT YEAR l111l6l l/l l 01 3l l Ll l-l l Ol | ||
@ REPORT l7l7l l-l 27 28 23 30 33 32 22 23 24 26 | @ REPORT l7l7l l-l 27 28 23 30 33 32 22 23 24 26 | ||
Line 56: | Line 52: | ||
relays with a relay capable of operating in the circuit under design condit_ ions. 80 LLI 18 9I 7 | relays with a relay capable of operating in the circuit under design condit_ ions. 80 LLI 18 9I 7 | ||
' 015 Y DISCOVERY DESCRIPTION | ' 015 Y DISCOVERY DESCRIPTION | ||
% POWER oTHER STATUS ST Ah 5 l l l Bl@lSurveillanceTesting l i s3 l9d @ l 0l 714l@lNA 10 12 13 44 45 46 | % POWER oTHER STATUS ST Ah 5 l l l Bl@lSurveillanceTesting l i s3 l9d @ l 0l 714l@lNA 10 12 13 44 45 46 80 7 " | ||
80 7 " | |||
ACTIVITY CON TENT LOCATION OF RELEASE AMOUNT oF ACTIVtTV l NA T.ELESSED OF RELE ASE I I li 181 i 7 8 9 l@I 10 l@l NA 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION ] | ACTIVITY CON TENT LOCATION OF RELEASE AMOUNT oF ACTIVtTV l NA T.ELESSED OF RELE ASE I I li 181 i 7 8 9 l@I 10 l@l NA 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION ] | ||
li j 7l l 0l 0l 0 l Zl l NA 80 PERSONNEL lNJURIES NUMBER DESCRIPTION I | li j 7l l 0l 0l 0 l Zl l NA 80 PERSONNEL lNJURIES NUMBER DESCRIPTION I l01 0l0 @ lNA 11 12 80 7 9 LOSSOF OR DAuAGE To FACILITY Q Q TYPE DESCRIPTION N/ | ||
l01 0l0 @ lNA 11 12 80 7 9 LOSSOF OR DAuAGE To FACILITY Q Q TYPE DESCRIPTION N/ | |||
enon060 1 4 9 l Z lhl NA TO | enon060 1 4 9 l Z lhl NA TO | ||
~ | ~ | ||
Line 72: | Line 64: | ||
Bernie Beyer PHONE: /414) 259-5000. Wr . 223E nvu 141-1 , , , . . . . . . . , , , , , | Bernie Beyer PHONE: /414) 259-5000. Wr . 223E nvu 141-1 , , , . . . . . . . , , , , , | ||
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TOLEDO EDISON COMPANY | TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION p - | ||
DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION p - | |||
SUPPLEMENTAL INFORMATION FOR LER NP-33-77-116 I 7 < | SUPPLEMENTAL INFORMATION FOR LER NP-33-77-116 I 7 < | ||
\s_/ | \s_/ | ||
DATE OF EVENT: December 28, 1977' FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Auxiliary Feed Pump 1-2 speed control was lost. | DATE OF EVENT: December 28, 1977' FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Auxiliary Feed Pump 1-2 speed control was lost. | ||
Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2064 c.nd Load (MWE) = 689. | Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2064 c.nd Load (MWE) = 689. | ||
la | la I | ||
Description of Occurrence: At 1600 hours on December 28, 1977 durinr the perfor- ' | |||
mance of ST 5071.01, " Auxiliary Feed Pump Monthly Surveillance Test", Auxiliary Feed Pump Turbine (AFPT) 1-2 speed control was lost. Auxiliary Feed Pump 1-2 was declared inoperable placing the unit in the Action Statement of Technical Specification 3.7.1.2, which requires two independent Auxiliary Feed Pumps in Modes 1, 2 and 3. | mance of ST 5071.01, " Auxiliary Feed Pump Monthly Surveillance Test", Auxiliary Feed Pump Turbine (AFPT) 1-2 speed control was lost. Auxiliary Feed Pump 1-2 was declared inoperable placing the unit in the Action Statement of Technical Specification 3.7.1.2, which requires two independent Auxiliary Feed Pumps in Modes 1, 2 and 3. | ||
i Designation of Apparent Cause of Occurrence: The cause of this occurrence is a design deficiency. The relays used in the AFPT speed control circuit evidently innot function without contact sticking or arcing under operating conditions. | |||
i Designation of Apparent Cause of Occurrence: The cause of this occurrence is a | |||
design deficiency. The relays used in the AFPT speed control circuit evidently innot function without contact sticking or arcing under operating conditions. | |||
_jticking or arcing contacts cause the control power-fuses to blow, resulting in c loss of speed control to the Auxiliary Feed Pump Turbine. | _jticking or arcing contacts cause the control power-fuses to blow, resulting in c loss of speed control to the Auxiliary Feed Pump Turbine. | ||
' Analysis of Occurrence: There was no danger to the health and safety of. the public or to unit personnel. Auxiliary Feed Pump 1-1 was operable to supply feedwater if a main steam line or feedwater break had occurred. | ' Analysis of Occurrence: There was no danger to the health and safety of. the public or to unit personnel. Auxiliary Feed Pump 1-1 was operable to supply feedwater if a main steam line or feedwater break had occurred. | ||
Line 103: | Line 85: | ||
i l | i l | ||
Failure Data: There have been other failures due to blown fuses in the AFPT speed l | Failure Data: There have been other failures due to blown fuses in the AFPT speed l | ||
control circuits,.several before a modification was made to reduce current load on relay contacts and two (one on AFP l-1 and one on AFP 1-2) since the modifica-tion was made on the Auxiliary Feed Pumps. All of the above failures occurred prior to the modification which added the additional relays. | control circuits,.several before a modification was made to reduce current load on relay contacts and two (one on AFP l-1 and one on AFP 1-2) since the modifica-tion was made on the Auxiliary Feed Pumps. All of the above failures occurred prior to the modification which added the additional relays. | ||
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Revision as of 22:16, 31 January 2020
ML19329B884 | |
Person / Time | |
---|---|
Site: | Davis Besse |
Issue date: | 01/18/1978 |
From: | Beyer B TOLEDO EDISON CO. |
To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
Shared Package | |
ML19329B878 | List: |
References | |
LER-77-116-03L, LER-77-116-3L, NUDOCS 8002060884 | |
Download: ML19329B884 (2) | |
Text
swesstunesearm-1C FORM 36G
- 77) .
_ICENSEE EVENT REPORT I (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION!
[ CONTROL BLOCK: l
}- l l l \
lh o
H D B S 1 0l0l-l0l0lNlPlFl-l0l3lgl4l1l1l1l1lgl 26 26 Li( ENSE TYPE JO l
$7 CAT 68 l
14 15 UGENSE NUMBER LICENSEE CODE
- ON'T
)I1I 8
"'[n"CE l L @l 0 l 5 l0 l- 10 l 3 l 4 l6 @l1 12 l2 l8 l7 l7 l@l0l1 O
60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I a121l At 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on 12/28/77 during the performance of ST 5071.01. "Auxiliarv Feed P ,-n o ,3 (AFP) Monthly Surveillance Test", Auxiliary Feed Pump Turbine (AFFT) 1-2 speed control l
l o i4 l l was lost. AFP l-2 was declared inoperable placing the unit in the Action Statement There1 o I s 1 I of Tech Spec 3.7.1.2, which requires two independent AFPs in Modes 1, 2 and 3.
personnel. The re- 1 o is ] l vas no danger to the health and safety of the oublic or to unit l
0 } 7 } l dundant AFP was available to supply feedwater if a main steam line or f eedwater break 1
o,s,j had occurred. (NP-33-77-116) 80 SLBCOdE SU E CoOE SUSC E COMPON ENT CODE E
ioisi 9
I cl al@ l El@ l Al@ I M l E l C l F l U l N REPORT to 11 12 13 18 19l@ l Zl@ l ZlREVIStoN
.0 @
? 8 OCCURRENCE SEcuENTIAL TvPE No.
REPORT No. CCOE LER/Ro EVENT YEAR l111l6l l/l l 01 3l l Ll l-l l Ol
@ REPORT l7l7l l-l 27 28 23 30 33 32 22 23 24 26
_ 21 FOR 8. SUPPLI MAN FACTURER HoVR$ 22 SS IT ON PL NT lAl@ lWl2l9l0l@
1E KN AC ON 33 A lgl34Fl@ lZl@
35 W@
06 l0l010}ul 37 40
[41Y l@ l42Y l@ 43 44 47 27 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS The relays used in the l
- ,,ojlThe cause of this occurrence is a design deficiency.
I
- ,,,,g AFPT speed control circuit evidently cannot function without contact stickinc under operating conditions. The blown control power fuse and both relays in AFP l-2 speed .l
, g A modification has been completed which replaces the [
, , gcontrol circuits were replaced.
relays with a relay capable of operating in the circuit under design condit_ ions. 80 LLI 18 9I 7
' 015 Y DISCOVERY DESCRIPTION
% POWER oTHER STATUS ST Ah 5 l l l Bl@lSurveillanceTesting l i s3 l9d @ l 0l 714l@lNA 10 12 13 44 45 46 80 7 "
ACTIVITY CON TENT LOCATION OF RELEASE AMOUNT oF ACTIVtTV l NA T.ELESSED OF RELE ASE I I li 181 i 7 8 9 l@I 10 l@l NA 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION ]
li j 7l l 0l 0l 0 l Zl l NA 80 PERSONNEL lNJURIES NUMBER DESCRIPTION I l01 0l0 @ lNA 11 12 80 7 9 LOSSOF OR DAuAGE To FACILITY Q Q TYPE DESCRIPTION N/
enon060 1 4 9 l Z lhl NA TO
~
NRC USE ONLY 80 7
- PU8ue:Tv .
ISSUED DESCRifclON !
i I IIII1!l!IIII!I I 2 i o l [,lijhlNA 68 69 80 %
d 1 to 7
Bernie Beyer PHONE: /414) 259-5000. Wr . 223E nvu 141-1 , , , . . . . . . . , , , , ,
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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION p -
SUPPLEMENTAL INFORMATION FOR LER NP-33-77-116 I 7 <
\s_/
DATE OF EVENT: December 28, 1977' FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Auxiliary Feed Pump 1-2 speed control was lost.
Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2064 c.nd Load (MWE) = 689.
la I
Description of Occurrence: At 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on December 28, 1977 durinr the perfor- '
mance of ST 5071.01, " Auxiliary Feed Pump Monthly Surveillance Test", Auxiliary Feed Pump Turbine (AFPT) 1-2 speed control was lost. Auxiliary Feed Pump 1-2 was declared inoperable placing the unit in the Action Statement of Technical Specification 3.7.1.2, which requires two independent Auxiliary Feed Pumps in Modes 1, 2 and 3.
i Designation of Apparent Cause of Occurrence: The cause of this occurrence is a design deficiency. The relays used in the AFPT speed control circuit evidently innot function without contact sticking or arcing under operating conditions.
_jticking or arcing contacts cause the control power-fuses to blow, resulting in c loss of speed control to the Auxiliary Feed Pump Turbine.
' Analysis of Occurrence: There was no danger to the health and safety of. the public or to unit personnel. Auxiliary Feed Pump 1-1 was operable to supply feedwater if a main steam line or feedwater break had occurred.
Corrective Action: The blown fuse and both of the relays in Auxiliary Feed Pump Surveillance Test ST 5071.01, " Auxiliary 1-2 speed control circuits were replaced.
Feedwater Monthly Test" was completed at 1730 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.58265e-4 months <br /> on December 28, 1977, return-
)' ing Auxiliary Feed Pump 1-2 to opocable status. This removed the unit from the
. Action Statement of Technical Specification 3.7.1.2 well within the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> limit.
A modification has been designed and, installed which adds a relay capable of operat-ing in the motor contact portion of the circuit under design conditions.
i l
Failure Data: There have been other failures due to blown fuses in the AFPT speed l
control circuits,.several before a modification was made to reduce current load on relay contacts and two (one on AFP l-1 and one on AFP 1-2) since the modifica-tion was made on the Auxiliary Feed Pumps. All of the above failures occurred prior to the modification which added the additional relays.
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