ML19309H597

LER 80-014/03L-0:on 800410,during Surveillance Test,One Overpower Delta T Setpoint Was Found to Trip About 70% Above Desired Setpoint.Caused by Intermittent Capacitor.Capacitor Was Replaced

ML19309H597
Person / Time
Site:	Prairie Island
Issue date:	05/09/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19309H590	List: ML19309H589 ML19309H597
References
LER-80-014-03L, LER-80-14-3L, NUDOCS 8005130549
Download: ML19309H597 (1)

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7 8 80 81 DOCK ET NUM8E R 68 69 EVENT DATE 74 7S REPORT DATi EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h ITTT1 1 During surveillance test, one overpower delta T setpoint was found to trip about l

, 3 l 70% above the desired setpoint. Redundant channels were operable. This is the firstl o , l occurrence of a failure of this magnitudo and type. Tech Spec Table 3.5-2 applies. l

, , g No effect on public health and safety. l 0 6 l l l

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7 8 9 10 11 12 13 18 9 20 SEQUENTIAL OCCURRENCE REPORT REVISION LE R/RO EVENT YEAR REPORT NO. CODE TYPE N '

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33 34 35 36 37 40 49 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l Bista'sle was immediately replaced with a calibrated spare. The failed Foxboro l l

i l bistable Model 63U Custom was found to have an intermittent capacitor. The capacitori i

i 2 l was replaced and the bistable placed in spare parts storage. l i a l I i 4 l l 7 8 9 80

$A  % POWER OTw E R STATUS DIS Y DISCOVERY DESCRIPTION i 5 W $ !1l0l0l@l N/A l { @l Surveillance testing l A TlVITY CO TENT RELEASED OP RELEASE AMOUNT OP ACTivlTY LOCATION OP RELEASE i 6 @ [Zj @ l NA l l NA l 7 8 9 10 ft 44 45 80 rERSONNEL EXPOSURES NUM8tR TYPE DESCRIPTION 3 I i 7 l 0.l 0 l 0 l@[Z_j@l NA l PERSONNE'tbunS l NuM8ER DESCR PTiON@

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LOSS OP OR DAMAGE TO PACILtTY TYPE DESCRIPTION i 9 [jLj@l NA l 7 8 9 10 80 7

2 0 8 9 ISSUE10 @lDE NA CRIPTION l 68 69 lllllllllllll%1 80 5 ns ad -388- N NAME OF PREPARER PHONE: {