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| issue date = 07/19/1977
| issue date = 07/19/1977
| title = Forwards LER 77-045/03L-0
| title = Forwards LER 77-045/03L-0
| author name = LIBRIZZI F P
| author name = Librizzi F
| author affiliation = PUBLIC SERVICE ELECTRIC & GAS CO. OF NEW JERSEY
| author affiliation = PUBLIC SERVICE ELECTRIC & GAS CO. OF NEW JERSEY
| addressee name = OREILLY J P
| addressee name = Oreilly J
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
| docket = 05000272
| docket = 05000272
Line 17: Line 17:


=Text=
=Text=
{{#Wiki_filter:.. ' ** Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /622-7000 Mr. James P. O'Reilly Director of USNRC Off ice of Inspections and Enforcements Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406  
{{#Wiki_filter:..'                                       **
Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /622-7000 July 19, 1977 Mr. James P. O'Reilly Director of USNRC Off ice of Inspections and Enforcements Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406


==Dear Mr. O'Reilly:==
==Dear Mr. O'Reilly:==


LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 77-45/03L July 19, 1977 Pursuant to the requirements of Salem Gener;ting Station Vnit No. 1 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 77-45/03L.
LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 77-45/03L Pursuant to the requirements of Salem Gener;ting Station Vnit No. 1 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 77-45/03L. This report is required within thirty (30) days of the occurrence.
This report is required within thirty (30) days of the occurrence.
Sincerely yours,
CC: Director, Office of Inspection and Enforcement (30 copies) Director, Office of Management Information and Program Control (3 copies) The Energy People Sincerely yours, .
                                                                    . ;?,~~
F. P. Librizzi General Manager -Electric Production 8001 08{)
F. P. Librizzi General Manager -
J" Report Number: Report Date: Occurrence Date: Facility:
Electric Production CC:   Director, Office             of Inspection and Enforcement           (30 copies)
* 77-45/03L 7/08/77 6/26/77 Salem Generating Station Public Service Electric & Gas Company Haricocks Bridge, New 08038 IDENTIFICATION OF OCCURRENCE:
Director, Office             of Management Information and           Program Control (3 copies) 8001 08{)
The Energy People
 
J" Report Number:
Report Date:
77-45/03L 7/08/77 Occurrence Date:    6/26/77 Facility:            Salem Generating Station Public Service Electric & Gas Company Haricocks Bridge, New J~rsey 08038 IDENTIFICATION OF OCCURRENCE:
Loss of 5024, 500kV Transmission Line CONDITIONS PRIOR TO OCCURRENCE:
Loss of 5024, 500kV Transmission Line CONDITIONS PRIOR TO OCCURRENCE:
Operational Mode 1, Reactor Power 100%, 100%
Operational Mode 1, Reactor Power 100%, 100%   Genera~or  Trip Test in progress.
Trip Test in progress.
DESCRIPTION OF OCCURRENCE:
DESCRIPTION OF OCCURRENCE:
At 1013 am, during the conduct of the lOOi Generator Trip Test, the 5024, SOOkV transmission line became inoperable due to operation of the Bus Section 1-5 and 5-6 Breaker Flashover Relay (NCHllA) and its associated HEA Relay. Technical Specification Statement for LCO 3.8.l.l w&s implemented and Surveillance Procedures 4.8.1.1.1.a and 4.8.1.1.2.a.2 were performed.
At 1013 am, during the conduct of the lOOi Generator Trip Test, the 5024, SOOkV transmission line became inoperable due to operation of the Bus Section 1-5 and 5-6 Breaker Flashover Relay (NCHllA) and its associated HEA Relay. Technical Specification Actio~ Statement for LCO 3.8.l.l w&s implemented and Surveillance Procedures 4.8.1.1.1.a and 4.8.1.1.2.a.2 were performed. At 1454, the 5024 transmission line was re-energized and Action StatPm~nt 3.R.1 .J. wRs terrnin~tA~.
At 1454, the 5024 transmission line was re-energized and Action 3.R.1 .J. wRs DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:
DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:
Bus sections 1-5 and 5-6 flashover protection HEA relay is tripped after 13 cycles time delay by either the #1 Unit main power transformer ground relay (PJCllAV) or the bus sections 1-5 and 5-6 breaker flashover relay (NHCllA) if the auxiliary switch contacts on both bus sections 1-5 and 5-6 breakers indicate that these breakers are open. When Salem No. 1 Unit is operating at 100% load, the PJCllAV is de-energized.
Bus sections 1-5 and 5-6 gene~ator breal~cr flashover protection HEA relay is tripped after 13 cycles time delay by either the #1 Unit main power transformer ground relay (PJCllAV) or the bus sections 1-5 and 5-6 breaker flashover relay (NHCllA) if the auxiliary switch contacts on both bus sections 1-5 and 5-6 breakers indicate that these breakers are open. When Salem No. 1 Unit is operating at 100% load, the PJCllAV is de-energized. It picks up at 480 amperes of main power transformer ground current. The NHCllA is energized, because it is connected to the generators output current transformers and is set to pickup at 7000 generator amps which is about 23% of rated generator load.
It picks up at 480 amperes of main power transformer ground current. The NHCllA is energized, because it is connected to the generators output current transformers and is set to pickup at 7000 generator amps which is about 23% of rated generator load. The transient data recorder showed that after bus sections 1-5 and 5-6 breakers opened, the No. 1 Unit generator current remained for rnore than 13 cycles at or above 8000 amperes due to the transformer exciting current resulting from the momentary rise in voltage_ on the generator as a result of the load Therefore, the NHCllA relay remained energized and in 13 cycles tripped the associated HEA relay, isolating the 5024 line at the station and at the New Freedom switching station.
The transient data recorder showed that after bus sections 1-5 and 5-6 breakers opened, the No. 1 Unit generator current remained for rnore than 13 cycles at or above 8000 amperes due to the transformer exciting current resulting from the momentary rise in voltage_ on the generator as a result of the load rej~ction. Therefore, the NHCllA relay remained energized and in 13 cycles tripped the associated HEA relay, isolating the 5024 line at the station and at the New Freedom switching station.
. . P *
 
* Report No. 77-45/03L
P*
* e 7/8/77 ANALYSIS OF OCCURRENCE:
*Report No. 77-45/03L ANALYSIS OF OCCURRENCE:
Technical Specification Action Statement 3.8.1.1.a allows 72 hours to restore an inoperable offsite circuit to operable status. The 5024, SOOkV transmission line was restored to operable status in 4 hours and 41 minutes, therefore, there was no violation of the Technical cations. CORRECTIVE ACTION: The bus section 1-5 and 5-6 breaker flashover NHCllA relay has withdrawn from service for the following reasons: 1.
* e   7/8/77 Technical Specification Action Statement 3.8.1.1.a allows 72 hours to restore an inoperable offsite circuit to operable status.             The 5024, SOOkV transmission line was restored to operable status in 4 hours and 41 minutes, therefore, there was no violation of the Technical Specifi-cations.
protection against either generator flashover is provided by the flashover relays connected to current formers located at each generator breaker. 2. Main power transformer ground relay provides redundant protection against one or two phase and/or phase to* ground flashover.
CORRECTIVE ACTION:
: 3. Due to the unpredictability of the residual current value in the generator  
The bus section 1-5 and 5-6 breaker flashover NHCllA relay has             be~n withdrawn from service for the following reasons:
-main power transformer circuit; the setting for the NHCllA which would prevent false tripping may be too high to provide effective protection under *all operating conditions.
: 1. Adeguat~ protection against either generator breake~ flashover is provided by the flashover relays connected to current trans-formers located at each generator breaker.
In addition, this protection is redundant.
: 2. Main power transformer ground relay provides redundant protection against one or two phase and/or phase to* ground flashover.
: 4. A false nuclear unit trip is not offset by the questionable benefit of the redundant protection provided by the NHCllA. FAILURE DATA: This event did not involve equipment failure. Prepared by T. Spencer //{f ! ,< .' .-7 '!/ / . ff/,, / II / ' , I ./ SORC Meeting No. 75-77 Manager -Salem* Generating Station *}}
: 3. Due to the unpredictability of the residual current value in the generator - main power transformer circuit; the setting for the NHCllA which would prevent false tripping may be too high to provide effective protection under *all operating conditions.             In addition, this protection is redundant.
: 4. A false nuclear unit trip is not offset by the questionable benefit of the redundant protection provided by the NHCllA.
FAILURE DATA:
This event did not involve equipment failure.
Prepared by       T. Spencer                   ~,;;,
II /
                                                        /{f !
                                                      / /.-7' ~)  '!/,<
                                                                . ff/,,
                                                                    , I ./
                                                                            /
Manager - Salem* Generating Station SORC Meeting No.         75-77}}

Latest revision as of 09:01, 3 February 2020

Forwards LER 77-045/03L-0
ML18081A861
Person / Time
Site: Salem PSEG icon.png
Issue date: 07/19/1977
From: Librizzi F
Public Service Enterprise Group
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18081A856 List:
References
NUDOCS 8001080515
Download: ML18081A861 (3)
v • d • e


Text

..' **

Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /622-7000 July 19, 1977 Mr. James P. O'Reilly Director of USNRC Off ice of Inspections and Enforcements Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. O'Reilly:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 77-45/03L Pursuant to the requirements of Salem Gener;ting Station Vnit No. 1 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 77-45/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours,

. ;?,~~

F. P. Librizzi General Manager -

Electric Production CC: Director, Office of Inspection and Enforcement (30 copies)

Director, Office of Management Information and Program Control (3 copies) 8001 08{)

The Energy People

J" Report Number:

Report Date:

77-45/03L 7/08/77 Occurrence Date: 6/26/77 Facility: Salem Generating Station Public Service Electric & Gas Company Haricocks Bridge, New J~rsey 08038 IDENTIFICATION OF OCCURRENCE:

Loss of 5024, 500kV Transmission Line CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 1, Reactor Power 100%, 100% Genera~or Trip Test in progress.

DESCRIPTION OF OCCURRENCE:

At 1013 am, during the conduct of the lOOi Generator Trip Test, the 5024, SOOkV transmission line became inoperable due to operation of the Bus Section 1-5 and 5-6 Breaker Flashover Relay (NCHllA) and its associated HEA Relay. Technical Specification Actio~ Statement for LCO 3.8.l.l w&s implemented and Surveillance Procedures 4.8.1.1.1.a and 4.8.1.1.2.a.2 were performed. At 1454, the 5024 transmission line was re-energized and Action StatPm~nt 3.R.1 .J. wRs terrnin~tA~.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Bus sections 1-5 and 5-6 gene~ator breal~cr flashover protection HEA relay is tripped after 13 cycles time delay by either the #1 Unit main power transformer ground relay (PJCllAV) or the bus sections 1-5 and 5-6 breaker flashover relay (NHCllA) if the auxiliary switch contacts on both bus sections 1-5 and 5-6 breakers indicate that these breakers are open. When Salem No. 1 Unit is operating at 100% load, the PJCllAV is de-energized. It picks up at 480 amperes of main power transformer ground current. The NHCllA is energized, because it is connected to the generators output current transformers and is set to pickup at 7000 generator amps which is about 23% of rated generator load.

The transient data recorder showed that after bus sections 1-5 and 5-6 breakers opened, the No. 1 Unit generator current remained for rnore than 13 cycles at or above 8000 amperes due to the transformer exciting current resulting from the momentary rise in voltage_ on the generator as a result of the load rej~ction. Therefore, the NHCllA relay remained energized and in 13 cycles tripped the associated HEA relay, isolating the 5024 line at the station and at the New Freedom switching station.

P*

  • Report No. 77-45/03L ANALYSIS OF OCCURRENCE:
  • e 7/8/77 Technical Specification Action Statement 3.8.1.1.a allows 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to restore an inoperable offsite circuit to operable status. The 5024, SOOkV transmission line was restored to operable status in 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and 41 minutes, therefore, there was no violation of the Technical Specifi-cations.

CORRECTIVE ACTION:

The bus section 1-5 and 5-6 breaker flashover NHCllA relay has be~n withdrawn from service for the following reasons:

1. Adeguat~ protection against either generator breake~ flashover is provided by the flashover relays connected to current trans-formers located at each generator breaker.
2. Main power transformer ground relay provides redundant protection against one or two phase and/or phase to* ground flashover.
3. Due to the unpredictability of the residual current value in the generator - main power transformer circuit; the setting for the NHCllA which would prevent false tripping may be too high to provide effective protection under *all operating conditions. In addition, this protection is redundant.
4. A false nuclear unit trip is not offset by the questionable benefit of the redundant protection provided by the NHCllA.

FAILURE DATA:

This event did not involve equipment failure.

Prepared by T. Spencer ~,;;,

II /

/{f  !

/ /.-7' ~) '!/,<

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, I ./

/

Manager - Salem* Generating Station SORC Meeting No. 75-77

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