ML20090E163

AO 50-220/74-15:during Markup of Motor Generator 167, Operator Tripped Supply Breaker for Power Board.Caused by Operator Error.Operator Educated in Proper Procedures. Training Sessions for All Operators Conducted

ML20090E163
Person / Time
Site:	Nine Mile Point
Issue date:	12/17/1974
From:	Schneider R NIAGARA MOHAWK POWER CORP.
To:	Goller K Office of Nuclear Reactor Regulation
References
12788, AO-50-220-74-15, NUDOCS 8303110602
Download: ML20090E163 (6)

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NIAGARA MOHAWK POWER CORPORATION l

NIAGARA MOHAWK boa l> g

( 300 ERIE t!OULEVARD. WEST , , ,

SYRACUTE N. Y. M202 ,' ' Mt(-

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December 17,1974 ^ ']rg)7

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tit. Karl R. Gotter k i ', -' ni /

Assistant OLtector of Operating Reactors ,: NGrp(y sa Directorate of Licensing .

l United Stater Atonic Energy Comission Washington, D.C. 20545 l

Dear th. Galler:

i in accordance with the Technical Specifications for the Nine blite Point Nuclear Station, Unit H1, the enetosed Abnormat Occtutrance Report (74-15) is being subsitted.

l This is in the accepted format as detailed in Regulatory

.s Guide 1.16, Rev. 1. 1i!4 l

l Vert) traly yours, k ',(

R.R. Schneider

& V Vice President Electric Operations

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~ NIAGARA MOHAWK POWER CORPORATIOrd NIAGARA - MOHAWK 4

SUBJECT:

Abnormal Occurrence 10 Day Letter j' ~

REFERENCE:

License DPR 17 .

Report No.

50-220 -/74-15' i Report Dai.c: 12/5/74 Occurrence Date: 11/26/74 I Facility: NY NMP #1

Identification of Occurrence:

An operator error resulting in an inadvertent trip of power board #167 ,

Conditions Prior to Occurrence: X Steady State Power Routine Shutdown

liot Standby Cold Shutdown I.ond Changes Refueling Shutdown s,

i Routino Startup Other - T 1708 Wt 580 We

-Description of the Occurrence:

During a process of Marking up MG Set #167 the operator -

inadvertently tripped the supply breaker for. power board #167..

This power board supplies certain components _of th'e ECCS' system wJth motive valve energy as well:as indicating lights for valve position. This event was. discovered during a weekly

• management review of plant operations and further reviewed during a SORC.

meeting to. determine the significance of this event. The powerboard was de-energized for-15 minutes',

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O Appare.2t Cause of the Occurrence:

Design Procedure Manufacture Unusual Service Installation /Const. Condition X Operator -Component Failure Other (Specify)

Analysis of Occurrence:

All redundant components in the ECCS system were in-an operable condition and therefore, no hazard would be presented to the general public.

Corrective Action:

'ihe operator has been warned that procedures and orders must be carefully fo116'ed.

w This will be followed up in training sessions for all oporttors.

l Failure Data:

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NIAGARA MOHAWK POWER CORPORATION NIAGARA -MOHAWK DATE: December 17, 1974

SUBJECT:

Abnormal Occurrence Report No. 50-220 /74-15 The enclosed Abnormal Occurrence Report is being submitted in accordance with Technical Specifications Section 6.

TO: James P. O'Reilly Directorate of Regulatory Operations Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406.

l FROM: Niagara Mohawk Power Corporation Nine Mile Point P.O. Box #32 Lycoming, New" York 13093 Docket 50-220 s . .

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NIAOAMA MOHAWK DATE: December 4, 1974

.1 SUBJBCT: Abnormal Occurrence Report No. 50-_220 /74- 15 The enclosed preliminary A0R is being submitted in accordance with Technical Specifications Section 6. . .

TDr James P. O'Reilly p v s;c Directorate of Regulatory Operations $ . I..

Region 1 ..a,X'.yM' ? .a 631 Park Avenue {;.

King of Prussia, Pennsylvania 19406 gg) _

PROM: Niagara Mohawk Power Corporation Nine Nils Point - James A. PatsPatrick Site P.O. Box #32 tycoming, New York 13093 Docket 50 220 h*h ey);. 3 ne_=

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NIAGARA MOHAWK POWER CORPORATION

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SUBJECT:

Abnormal Occurrence 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Notification

Confirming Mr. C.L. St.uart phone conversstion L with Mr. T. Shedlosky ABC R0t1 office on 12/4774 .

I REFBRENCE: License DPR 17 .

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r Report No.t 50- 220 /74- 15 I Report Dater 12/5/ 7_.:

Occurrence Date: 11/26/74 __

Pacility: Ny FMP W 1 t Identification of Occurrence:

i g On operstor error resulting in an inadvertant trip of a power board #167 ,

I Conditions Prior to g Occurrence: ,

X Steady State Power Routina Shutdown

Hot Standby b Cold Shutdown Load Changes -

'a g . Refueling Shutdown .

Routine Startup '

Other .-

1700 MWt 500 MWe Description of the Occurrence:

i e g During a process of " Marking Up" MG Set 5167 the operator g inadvertently tripped the supply breaker for power board 167, a This power board supplies certain components of the ECCS system

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with motive valvo. energy as well as indicating lights for valve position. This event was discovered during a weekly managees::t F ytview of plant operations and further reviewed during a 50RC meeting p to determine the significance of this event. The powerboard was E de-energized for 15 minutes.

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Sppstent Causa cf th3 an:bs Design Procedure Manufacture thi===1 Service Installation /Const. Condition 1 Operator - Component Pailure Ottar (3pecify)

Analysis of Occurrence:

All redundant components in the ECCS system were in an operable condition and therefore, no hazard would be presented to the general public. .

Corrective Actiont . . . . .

The operator has been warned that procedures and orders must be carefully followed. This will be followed up in training sessions for all operators. ,

l Po11ure Data:

N/A e

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