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| document report number = NUDOCS 8001270256
| document report number = NUDOCS 8001270256
| package number = ML19319B691
| package number = ML19319B691
| 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
}}
}}


=Text=
=Text=
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8 7
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8 189withdrawn, but the indicator itself had a fluctuatine readine. This is                                                                               l E Lnot a repetitive occurrence. OTP-33-77-63)                                                                                                             1 7     89 8L                                                                                                 -
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_.. _ _ _ _ . . . . .
TOLEDO EDISON COMPANY
  ,
(
(                                            TOLEDO EDISON COMPANY
)-
        )-
DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION
      /                          DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-63
/
SUPPLEMENTAL INFORMATION FOR LER NP-33-77-63
_DATE OF EVENT: August 12, 1977 F_ACILITY: Davis-Besse Unit 1
_DATE OF EVENT: August 12, 1977 F_ACILITY: Davis-Besse Unit 1
_IDE!TIIFICATION OF OCCURRENCE:
_IDE!TIIFICATION OF OCCURRENCE:
Rod 4 of Group 4 was inoperable.The Absolute Position Indicator (API) for Control Conditions Prior to Occurrence:       The plant was in Mode 2, with Power (MWT) = 0 and Load (M Tr) = 0.
Rod 4 of Group 4 was inoperable.The Absolute Position Indicator (API) for Control Conditions Prior to Occurrence:
The plant was in Mode 2, with Power (MWT) = 0 and Load (M Tr) = 0.
Description of Occurrence: At 1910 hours on August 12, 1977, the Absolute Position Indicator (API) for Control Rod 4 of Group 4 was inoperable. The Control Room operator could not determine Control Rod 4 position within + 6.5%
Description of Occurrence: At 1910 hours on August 12, 1977, the Absolute Position Indicator (API) for Control Rod 4 of Group 4 was inoperable. The Control Room operator could not determine Control Rod 4 position within + 6.5%
This placed the Station in Action State =ent (a) of Technical Specification    ,
This placed the Station in Action State =ent 3.1.3.3.
                                                                                                .
(a) of Technical Specification The indicator light (relative position indicator) for Rod 4 showed that it was 100% withdrawn, but the API reading fluctuated frem 70-100% withdrawn.
3.1.3.3.
the indicator lights and API readings for the other reds in Group 4 shewed 100%
The 100%indicator withdrawn, light but (relative position indicator) for Rod 4 showed that it was the API reading fluctuated frem 70-100% withdrawn. Since the indicator lights and API readings for the other reds in Group 4 shewed 100%
Since thdrawal, it was suspected that the API for Rod 4 was defective Designation of Aeoarent Cause of Occurrence:
thdrawal, it was suspected that the API for Rod 4 was defective     .
                                                                                                                        -
Designation of Aeoarent Cause of Occurrence:
Upon investigation, Instrument and Control Technicians round that a relay in the Position Indicator Panel was defective.
Upon investigation, Instrument and Control Technicians round that a relay in the Position Indicator Panel was defective.
Dianond Controls.The relay, along with connecting cable, was replaced by the vendor, Analysis of Occurrence:
Dianond Controls.The relay, along with connecting cable, was replaced by the vendor, Analysis of Occurrence:
public or Station personnel.There was no danger to the health and safety of the The cont nl red was m-+= Thy aligned with the group,     and relative indication was still operable.
public or Station personnel.There was no danger to the health and safety of the The cont nl red was m-+= Thy aligned with the group, and relative indication was still operable.
properly.                                                   The cvuisol rod was operating
properly.
                                                                                                                      .
The cvuisol rod was operating t
t Corrective Action: On August 13, 1977                                                                             !
Corrective Action: On August 13, 1977 operability to the API for Control Rod 4the relay was replaced, returning Statenent (a) of Technical Specification 3.1.3.3.This removed the Station from Action
operability to the API for Control Rod 4the relay was replaced, returning                                     .
,_+
Statenent (a) of Technical Specification 3.1.3.3.This removed the Station from Action                             ;
5 I ;
                                                                                                                          <
*i Failure Data:
                                                                                                          ,_+       .
There have been no previous similar occurrences.
5 I ;         I Failure Data:                                                                                         *i There have been no previous similar occurrences.                                   .e
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Latest revision as of 19:49, 1 January 2025

RO NP-33-77-63:on 770812,absolute Position Indicator for Control Rod 4 Showed Fluctuation Reading.Caused by Defective Relay in Position Indicator Panel.Relay Replaced Returning Absolute Position Indicator to Svc
ML19319B788
Person / Time
Site: Davis Besse 
Issue date: 09/12/1977
From: Lingerfelter J, Vallade S
TOLEDO EDISON CO.
To:
Shared Package
ML19319B691 List:
References
NUDOCS 8001270256
Download: ML19319B788 (2)
v • d • e


Text

O LICENSEE EVEtr REPORT p.

b

,l,_ L j I !

!__j Comraos stoC=

Naut

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L Ct wst Nuwet e i v et t v"pt

@]9[0lH I DIB i S ilj 10 j,0L j Ol 01 NI Pl{l -10 ; 3l l4 l

t jl l l[lj OJ 3{

la ' 15 25 2G s0 t

7 CattCom'

  • L
  • **
  • C P OnCut t Nuuet a r gt h e ria t t etpost cas t p0iCovit y L

lWL_J [01 50._i 0 3l4 1 6 i t 01 8 11;2 1 7l7 1 10 91 11 Lj 1

1 27 17j t

Si ha 59 6a 68 69 7e 75 60 (vtNT Of SCRsPf tom g: The Absolute Positi,on Indicator (API) for Control Rod 4 of Group 4 was l

7 89

@l inoperable. The indicator light for Rod 4 showed that it was 100%

8 89 8 1 withdrawn, but the indicator itself had a fluctuatine readine. This is l

7 89 E Lnot a repetitive occurrence.

OTP-33-77-63) 1 7

89 8L 1

[n"n't

@ l b"t" t e"'

u =7uYa"c"eYn'r a coucows new coor supp voos A reon i [Ej iItNISITIR1Ui

[10

[D 11 I 51 01

[NJ 3

s9 to in 12 17 43 44 47 48 CAUST DESCRIPiioN l Instru:nent and_Cggt.r_o_1 Technicians found that a relay in the Position I

9 l Indicator Panel was defective.

It was replaced by the vendor.

l' 84 e9 O

@ l,

'd

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P. I,IJ L 8^

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> e9 A3 ADD 11 TONAL F ACTOR $

31 NA l

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i sa to Jacque Lingenfelter/ Sue Vallade (4197'259-5000, Ext. 251 DVR # 095-1,129-1 8001270

TOLEDO EDISON COMPANY

(

)-

DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION

/

SUPPLEMENTAL INFORMATION FOR LER NP-33-77-63

_DATE OF EVENT: August 12, 1977 F_ACILITY: Davis-Besse Unit 1

_IDE!TIIFICATION OF OCCURRENCE:

Rod 4 of Group 4 was inoperable.The Absolute Position Indicator (API) for Control Conditions Prior to Occurrence:

The plant was in Mode 2, with Power (MWT) = 0 and Load (M Tr) = 0.

Description of Occurrence: At 1910 hours0.0221 days <br />0.531 hours <br />0.00316 weeks <br />7.26755e-4 months <br /> on August 12, 1977, the Absolute Position Indicator (API) for Control Rod 4 of Group 4 was inoperable. The Control Room operator could not determine Control Rod 4 position within + 6.5%

This placed the Station in Action State =ent 3.1.3.3.

(a) of Technical Specification The indicator light (relative position indicator) for Rod 4 showed that it was 100% withdrawn, but the API reading fluctuated frem 70-100% withdrawn.

the indicator lights and API readings for the other reds in Group 4 shewed 100%

Since thdrawal, it was suspected that the API for Rod 4 was defective Designation of Aeoarent Cause of Occurrence:

Upon investigation, Instrument and Control Technicians round that a relay in the Position Indicator Panel was defective.

Dianond Controls.The relay, along with connecting cable, was replaced by the vendor, Analysis of Occurrence:

public or Station personnel.There was no danger to the health and safety of the The cont nl red was m-+= Thy aligned with the group, and relative indication was still operable.

properly.

The cvuisol rod was operating t

Corrective Action: On August 13, 1977 operability to the API for Control Rod 4the relay was replaced, returning Statenent (a) of Technical Specification 3.1.3.3.This removed the Station from Action

,_+

5 I ;

  • i Failure Data:

There have been no previous similar occurrences.

.e

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