ML20086E437

AO 74-10:on 740626,HPCI Inverter Tripped,Rendering HPCI Sys Inoperable.Cause Not Stated.Inverter Replaced

ML20086E437
Person / Time
Site:	Vermont Yankee
Issue date:	06/27/1974
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086E434	List: ML20086E432 ML20086E437
References
AO-74-10, VYV-3315, NUDOCS 8312070247
Download: ML20086E437 (2)

Text

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O O qI-ep) VERMONT YANKEE NUCLEAR POWER CORPORATION SEVCNTY GCVEN OROVC GTHCCT

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VYV-3315

• b u m vCHNON. VERMONT o3334 June 27, 1974 f.j';

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s 7 s p r iif p W l Director

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Directorate of Regulntery Operationc ,' Region I I-  ? -

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United States Atomic Energy Commission k)", . 3 db ,

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King of Prussia, Pennsylvania 19406 L.L'

REFERENCE:

Operating License DPR-28 khfirv. , . .[

i Docket No. 50-271 Abnormal Occurrence No. A0-74-10 (24 Ilour Report)

Dear Sir:

j As defined by Technical Specifications for the Vernont Yanhec l

wucio.nr vnwor e n n nn , wen nn es , , u c. nra v<.nnvenng c>m enipsu4ng 1 Abnormal Occurrence as A0-74-10 and confirming our telephouc conversation with your office. -

l At 1523 on June 26, 1974, during normal plant operation, the llPCI inverter tripped, rendering the llPCI system inonerable. The inoperability of the llPCI system is in violation of the Limiting Condition for Operation as defiacd in Section 3.5.E.1 of the Technical Specifications which states in part that the HP2I system shall be operable whenever there is irradiated fuel in tbc reactor vessel and reactor pressure is greater than 150 psig.

The reactor uan operating at 79% power at the time of this occurrence.

The inverter uas replaced with an operable sparc and the llPCI system was declared orarabic at 1620. During the time span of IIPCI inoperability, surveillance teating was initiated as required by Technical Specifications Section 4.5.E.2 and was terminated when the llPCI syste n was made operable.

Very truly yours, W VEP'IONT YANREE NUCLEAR POWER CORPORATION Ic - . 0

. E.U. Riley "N ~~

Plant Superintendent WPM /kbd 10[ q l

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8312070247 740703 Y PDR ADOCK 05000271

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Director ' - - - - 'N llirecE0 rate of Repilat Operationa, Region I g 2 bc ; $%l'.[r-(

l!alted States Atcale Eawgy Ccrdssica f y&K ,

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King of Fressia, Pennsylvania 19405 j }$hf-w bg.x '

REFERENCD Operating License DPR-28  ; M.se:.V DocketNo.50-271 t "4 . -

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Abnortal Occurrence No. A0-74-10 (24 IIcurReport) 6

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DearSir:

. 7 As defined by Technical Specificaticas for the Vertont Yankee F.

Nuclear Power Station, Sectica 6.7, we are reporting the following 2h%y Abnorm 1 Occurrence as A0-74-10 and confirning cut telephone conversatica . f,?.w?.h, n

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At1523caJune 26,1974, during norral plant operation, the llPCI h' see inverter tripped, rendering the IIPCI systen inoperable. The inoperability w CiLA of the HPCI systca is in violatica of the Lhiting Condition for Opcration as defined in Section 3.5.E.1 of the Technical Specifications which states in part that the EPCI systes chall be operable whenever there is irradiated a fuel in the reactor vessel and reactor pressure is greater than 150 psig. .

The reactor was operating at 79% pcuer at the tine of this occurrence.

The inverter was replaced with an operable spare and the llPCI systen wasdeclaredcperableat1620. During the tire span of RPCI inoperability, surveillance testing was initiated as required by Technical Specificaticas Sectica 4.5.E.2 and was teminated when the HPCI systen was cade operable.

Verytrulyyours, VEFJ.0NT YANKEE N!JCLFR P0'JER CORFORATION 9?S, j

B.E Riley T ~I '

PlantSuperintendent ig UPM/khd m t. m

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