05000285/LER-1980-023-03, /03L-0:on 800908,during Routine Operations,Power to Lockout Relay Coil 86A1/CPHS Was Interrupted.Caused by Electrically Opened Contacts.Contacts Cleaned & Burnished

/03L-0:on 800908,during Routine Operations,Power to Lockout Relay Coil 86A1/CPHS Was Interrupted.Caused by Electrically Opened Contacts.Contacts Cleaned & Burnished

ML19351D667
Person / Time
Site:	Fort Calhoun
Issue date:	09/26/1980
From:	Mueller R OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19351D666	List: 05000285/LER-1980-023, Forwards LER 80-023/03L-0 05000285/LER-1980-023-03, /03L-0:on 800908,during Routine Operations,Power to Lockout Relay Coil 86A1/CPHS Was Interrupted.Caused by Electrically Opened Contacts.Contacts Cleaned & Burnished
References
LER-80-023-03L, LER-80-23-3L, NUDOCS 8010140447
Download: ML19351D667 (4)

LER-1980-023, /03L-0:on 800908,during Routine Operations,Power to Lockout Relay Coil 86A1/CPHS Was Interrupted.Caused by Electrically Opened Contacts.Contacts Cleaned & Burnished

Event date:
Report date:
2851980023R03 - NRC Website

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3 60 63 OOCKET NUMBER 68 69 EV ENT DATE 74 75 REPCRT OATE SC EVENT DESCRIPTION AND PRCBASLE CCNSEQUENCES h l a 121 l Durina routine power coerations, the "CPHS-Al Auto Standby" annunciator went into I

alarm and the amber / supervisory light associated with the 86Al/CPHS (containment

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tai 3i t t o 1.i l 1 pressure high signal) had extinguished, thus signifying that power to the 86Al/CPHS I 4

lockout relay coil had been interrupted, During the time of the incident all remaining [

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.f 1o !s i i relays and engineered safeguard channels were coerabie and all eouipment actuated by [

the the 86Al/CPHS lockout relay would have operated via the 86A/CPHS, 86B/CPHS or thq Ici: 1I ia ia i i 86Bl/CPHS Channels if necessary.

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liiall Per Maintenance Order 47032, it was discovered that a normally closed set of contacts; f

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i,,,, I opened and interrupted the power feed to the 86Al/CPHS relay, its associated super- [

j i,iui visory light and the 86Al/CPHSS sucervisory relay. The contacts were cleaned and l

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LER 80-023 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 Attachment No. 1 3afety Analysis l

The Fort Calhoun Station Unit No.1 Engineered Safety Feature System is so designed that no single failure can prevent the performance of a safety function if required.

During the time that the 86-Al/CPHS (Containment Pressure High Sig-nal Lock-out Relay) was de-energized and thus inoperable, the 86A/CPHS i

(A Channel), tha 86-B/CPHS (B Channel) and the 86-Bl/CPHS (B Channel l

Cerived Signal) relays were all operable and available to mitigate the l

consequences of an accident if required.

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l.ER No.80-023 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 Attachment No. 2

Corrective Action

The cause of the pcwer failure to the 86-Al/CPHS relay, (containment Pressure High Signal Channel A Derived Signal Relay), was a dirty set of i

contacts on the Channel "A" derived signal cutoff switch CS/SP-A.

Therefore, the contacts of the switch were cleaned and burnished.

Sub-sequencly, the derived signal cutoff switch and the asscciated 86-Al/

CPHS lockout relay were returned to satisfactory / normal operation.

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LER No.80-023 Omaha Public Pover District Fort Calhoun Station Unit No.1 Docket No. 05000285 Attachment No. 3 Failure Data l

l This is the first failure of a derived signal cutoff switch contact which caused a loss of power to an Engineered Safeguards lockout relay at the Fort Calhoun Station.

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