ML20062C538

/01T-0 on 781010:2 4KV Emergency Bus Sequential Loading Relays Found Outside Tech Spec Limits.Caused by Error in Determining Setpoint & Calibr Span of Relays.Relays Recalib & Testing Procedures Revised

ML20062C538
Person / Time
Site:	Peach Bottom
Issue date:	10/24/1978
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20062C533	List: ML20062C528 ML20062C538
References
LER-78-041-01T, LER-78-41-1T, NUDOCS 7811090141
Download: ML20062C538 (1)

Text

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Il 77) ts. r. fatli t e Ali f.e s'.tle n eU. Tis #AMabibN Unit 2 LICENSEE ET/ENT REPORT Report No.

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LICENSEE CODE 14 LICENSE NUMBE4 26 l Oh@l TYPE JO 4l$F1l l 1l CAT $8 l@ 1l 1l@

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74 'S IoTTIIEVENTDuring DESCRIPTION AND PROB ABLE CcNSEQUENCES h routine surveillance testing, two hKV emergency bus sequential ,l i' -

Io 121 l loading relays (Westinghouse 187609h) were found outside of the limits l 10141 l of tech spec (Table 3.2.3). These relays allow loaang of the Diesel 'I o s l Generators during a loss of power. Because a diesel generator automatic l 1o is I l actuation and load accentance test for a loss of never was successfully I Lo ' ' J l verfomed durine trevious refueling outage and the actual setpoint was [

t o I81 1 less than 1 percent above the upper limit, safety significance is minimal.

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34 35 36 37 40 41 43 43 lW 44 l1 l2 l0 l@ 4y CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h

[g l The cause of this occurrence is attributed to an error in I l determining the setpoint and calibration span of the relays. The relays 't I@

gg l on both Unit 2 and Unit 3 were recalibrated to the midrange of the  ;

I technical specification limits. The surveillance test has'been revised i 3 l g

. ".- u tfTTTl I to eliminate this deficiency.

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