ML19329B630: Difference between revisions

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| document report number = NUDOCS 8002050746
| document report number = NUDOCS 8002050746
| package number = ML19329B551
| package number = ML19329B551
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO,LER), TEXT-SAFETY REPORT
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER), TEXT-SAFETY REPORT
| page count = 2
| page count = 2
}}
}}
Line 18: Line 18:
=Text=
=Text=
{{#Wiki_filter:.
{{#Wiki_filter:.
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g i While recalibrating RCS pressure bistables. a simulated pressure signal es                                                                                                                                     ,                  s
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[jg[ Pump. HV-DHil was re-opened. Decay Heat Pump restarted and 3000 gpa fle r s ee                                                                                                                                                             a
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[ojg i to the RCS re-established. NP-32-77-3.                                                                                                                       !
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                @j)[ this int,arlock to prevent closing'of HV-DH11 (procedure inadecuacy).                                                                                       N 1     is                                                                                                                                                       iG
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@ l rose: HV-Dilli s,troked closed. Operations immediately tripped Decay Heat :
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[jg[ Pump. HV-DHil was re-opened. Decay Heat Pump restarted and 3000 gpa fle r s ee a
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                                      %            Jacque Lingenfelter/Stan Batch                                                           (4197 ' 259-5000. E:(t . 251 l
@j)[ this int,arlock to prevent closing'of HV-DH11 (procedure inadecuacy).
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        .        .s S           *
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            \
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TOLEDO EDISON COMPA!N DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-32-77-3 DATE OF EVENT: May 28, 1977 FACILITY: Davis-Besse Unit 1               -
TOLEDO EDISON COMPA!N DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-32-77-3 DATE OF EVENT: May 28, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: 'While recalibrating SFAS Channel 4, a simulated
                                                                                                                ~
~
IDENTIFICATION OF OCCURRENCE: 'While recalibrating SFAS Channel 4, a simulated pressure signal rose above setpoint 433 psig; HV-DHil stroked closed and Decay Heat Punp 1-2 tripped causing a situation in violation of Technical Specifica-
pressure signal rose above setpoint 433 psig; HV-DHil stroked closed and Decay Heat Punp 1-2 tripped causing a situation in violation of Technical Specifica-tion 3.4.1.
;                tion 3.4.1.
I Conditions Prior to Occurrence: The plant was in Mode 5.
I Conditions Prior to Occurrence: The plant was in Mode 5.             Power (MRI)0 - Power
Power (MRI)0 - Power (MWE)D. RCS Pressure less than 200 psig.
!                (MWE)D. RCS Pressure less than 200 psig.
Description of Occurrence: At 0045 Hours, May 28, 1977, an I&C mechanic was i
Description of Occurrence: At 0045 Hours, May 28, 1977, an I&C mechanic was                       i workfag on SFAS Channel 4, recalibrating the RCS pressure bistables. As the simulated pressure rose, KV-DH11 stroked closed at its setpoint of 433 psig.
workfag on SFAS Channel 4, recalibrating the RCS pressure bistables. As the simulated pressure rose, KV-DH11 stroked closed at its setpoint of 433 psig.
Oper.stions immediately tripped decay heat pump.                                         ,
Oper.stions immediately tripped decay heat pump.
i
i
    \s_ /       Designation of Anoarent Cause of Occurrence: This event has been determined to have been caused by'a procedural inadequacy in Maintenance Instruction I 1-1701 Analysis of 'ccurrence:
\\s_ /
O            The closing of DH 11 and subsequent de-energi:ation of Decay Heat Pump 1-2 caused decay heat flow to be less than 2800 gpm for three minutes.         Since flow was not needed for decay heat removal and Decay Heat Pump l-2 was re-started, no threat resulted to the health and safety of the public or station personnel.
Designation of Anoarent Cause of Occurrence: This event has been determined to have been caused by'a procedural inadequacy in Maintenance Instruction I 1-1701 Analysis of 'ccurrence: The closing of DH 11 and subsequent de-energi:ation of O
Decay Heat Pump 1-2 caused decay heat flow to be less than 2800 gpm for three minutes.
Since flow was not needed for decay heat removal and Decay Heat Pump l-2 was re-started, no threat resulted to the health and safety of the public or station personnel.
Corrective Action: I&C mechanic i= mediately reset the bistable, operator re-opened HV-DH11, restarted Decay Heat Fump and re-established 3000 gpm flow to RCS. Maintenance Instruction I l-1701 was modified to defeat the DH 11 valve logic by utilizing a jumper across the ' interlock.
Corrective Action: I&C mechanic i= mediately reset the bistable, operator re-opened HV-DH11, restarted Decay Heat Fump and re-established 3000 gpm flow to RCS. Maintenance Instruction I l-1701 was modified to defeat the DH 11 valve logic by utilizing a jumper across the ' interlock.
Failure Deta: DH 11 was inadvertently closed on May 27,1977 (LER NP-32-77-2) ,
Failure Deta: DH 11 was inadvertently closed on May 27,1977 (LER NP-32-77-2),
but the cause was a wiring installation error, not a procedure error as caused this occurrence.
but the cause was a wiring installation error, not a procedure error as caused this occurrence.
    %/
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            )
%/
                                    .                                                                              I
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Latest revision as of 06:53, 31 December 2024

RO NP-32-77-03:on 770528,during Recalibr of RCS Pressure Bistables,Pressure Signal Rose & HV DH11 Stroked Closed, Tripping Decay Heat Pump.Caused by Inadequate Calibr Procedure.Personnel Reset Bistable & Reopened HV-D11
ML19329B630
Person / Time
Site: Davis Besse 
Issue date: 06/11/1977
From: Batch S, Lingenfetter J
TOLEDO EDISON CO.
To:
Shared Package
ML19329B551 List:
References
NUDOCS 8002050746
Download: ML19329B630 (2)
v • d • e


Text

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.h LICENSEE EVENT RET' ORT t

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68 64 69 Je 36 c,

t ytNT Uf SCaiPT'CN g i While recalibrating RCS pressure bistables. a simulated pressure signal es s

@ l rose: HV-Dilli s,troked closed. Operations immediately tripped Decay Heat :

> ss

-a

[jg[ Pump. HV-DHil was re-opened. Decay Heat Pump restarted and 3000 gpa fle r s ee a

[ojg i to the RCS re-established.

NP-32-77-3.

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Caust otscaietion The calibration _pr_ocedure did not provide instructions for jurpering out t

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TOLEDO EDISON COMPA!N DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-32-77-3 DATE OF EVENT: May 28, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: 'While recalibrating SFAS Channel 4, a simulated

~

pressure signal rose above setpoint 433 psig; HV-DHil stroked closed and Decay Heat Punp 1-2 tripped causing a situation in violation of Technical Specifica-tion 3.4.1.

I Conditions Prior to Occurrence: The plant was in Mode 5.

Power (MRI)0 - Power (MWE)D. RCS Pressure less than 200 psig.

Description of Occurrence: At 0045 Hours, May 28, 1977, an I&C mechanic was i

workfag on SFAS Channel 4, recalibrating the RCS pressure bistables. As the simulated pressure rose, KV-DH11 stroked closed at its setpoint of 433 psig.

Oper.stions immediately tripped decay heat pump.

i

\\s_ /

Designation of Anoarent Cause of Occurrence: This event has been determined to have been caused by'a procedural inadequacy in Maintenance Instruction I 1-1701 Analysis of 'ccurrence: The closing of DH 11 and subsequent de-energi:ation of O

Decay Heat Pump 1-2 caused decay heat flow to be less than 2800 gpm for three minutes.

Since flow was not needed for decay heat removal and Decay Heat Pump l-2 was re-started, no threat resulted to the health and safety of the public or station personnel.

Corrective Action: I&C mechanic i= mediately reset the bistable, operator re-opened HV-DH11, restarted Decay Heat Fump and re-established 3000 gpm flow to RCS. Maintenance Instruction I l-1701 was modified to defeat the DH 11 valve logic by utilizing a jumper across the ' interlock.

Failure Deta: DH 11 was inadvertently closed on May 27,1977 (LER NP-32-77-2),

but the cause was a wiring installation error, not a procedure error as caused this occurrence.

)

%/

I

, _.

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