ML20086E145

AO 75-10:on 750429,low Water Level Switch Associated W/ Differential Pressure Indicating Sensor 2-3-58B Actuated Low.Switch Adjusted

ML20086E145
Person / Time
Site:	Vermont Yankee
Issue date:	04/30/1975
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086E143	List: ML20086E145
References
AO-75-10, VYV-3852, NUDOCS 8312060087
Download: ML20086E145 (3)

Text

-

c' 1;$>JqCRMONT i

YANKEM NUCLEAR 130WER COR m scveraTy ccvce4 oRovc nrncer RUTLAND, VEltMONT 05701

"' W '

VYV-3852 - r'. o, uOx in7 VcRNON. VcRMONT c5354 April 30, 1975 l Gc1 United States Nucicar Regulatory Commission Office of Inspecticn and Enforcement ()O '

~ Region I '

N O ,.

631 Park Avenue King of Prussia, Pennsylvania 19406 .-

ATTEtITION: James P. O'Reilly, Director REFEREUCE: Operating License DPR-28 Docket No. 50-271 (24 Hoor Report)

Abnormal Occurrence No. A0 -10

Dear Sir:

As defined by Technical Specifications for the Vermont' Yankee Nuclear Power Station, Section 6.7, we are reporting the following Abnormal

' Occurrence as A0-75-10 and confirming our telephone conversation with you office.

29, 1975, while performing a routine At approximately 1000 on Aprilit was discovered that the low water level; scheduled surveillance test, switch associated with Differential Pressure Indicating Sensor 2-3-58B actuated at -18.0 inches water icvel. Tabic 3.1.1 of the Technical U* Specifications requires that the trip Icvel setting of this instrument t the heactto>1inchwaterlevel.[Failureofthisswitchtoactuatea' specified trip level setting resulted in fcuer operabic The instrument channels switch was immediately per trip system than that required.by the Tabic.

adjusted to actuate at a conservative actting of 3.0 inches water Icvel.

'Ihc plant was operating at full power at the time of this occurrence.

Very truly yours, 8312060087 750509 k #. . '"

PDR ADOCK 05000271 Bradford W. Riley y S PDR Plant Superintendent IIH/kbd 11331

y ., J q

% vsmwom ham rmcimrahm cow-mou i .

otver4TY OCvcte 07tOVC GTncCT

~

1 Run.re. Vmmo:Tr osvo '

7 " ' ^ ' "

vvv-30s2* P.O.COM 157

VrnNON. VEnttOt4Y C3354 April 30, 1975

) .__ _ . . _ .

~ United Statea !!ucione Rcgulatorv Comulcolon Offico of Incpsetion and Titi'orectcont / /- f Region I J s' .

631 Par'c Avertue u- m. -

< King cf Prunnia, Pcancylvania 19405 ,

/x 4 KPICNTIO :t J wac:3 P. O'Ro111y, Director '

s 7. . . , W s

, ! i;.gG'n '

ILEUERE'70U: Operatina Licenso DPR-20 Dochet !!o. S-97L Abnocent Ge'currenca Ho. AG-75 7.0_ (24 Hour ncport) ,

1 .

Dear Sir:

I An defined 1 y Technical Specifice.ticns for the Verr:cet Yenhca Encicar Fouar Ste:ich, Section 6.7, un nro reporting tho followir. : libunn:a1 ..

Occiffiib~ce 1.2: DF/S-10 and ccnfiming our telephone convernntion with your oEfico. A o

At cppronh.c.tely 1007 on t.pril 20, 1975, uhile perfoming a routine cchedulcd survellicace to :t, it uau diccc cared that the low teater invol .

cultch cocecinted with Differentici Preanuro Indienting Scncor 2-3-S03 L .

~

ne tuat.cr1 at -if:.0 inchco t.u.ur icval. Tnble 3.1.1 of the Technicci Speciddentican requiron t.1 ut the crip le.vol netting of thia instruncnt be n .:t to 11 L.ch unter loral. Failto:e of thin cuitch to uctt.c::e at th . ..

avecified trip Ic.sd. catting recultc 1 in fever opernblo instrut..cne chennela por tedp s::inte:t thnu thac required by cle Tablo. The cuitch van it=edictcly 1 cdjtusted to actm.to at a concorvativo cctting of 3.0 inc1raa water icvel.

The plant 4 :s operating at full pener at tha tino of thio . occurrence.

Very truly youro, s .) --

a Dredford 11. Riloy * \

Plant Superintendent i-1 ~

HEAbd - - - - - ' - * - - - ' - - -

"+& -

y l...

(_ .

i

O o

'A '

(A VERMONT YANKEM NUCLEAR l'OWER COlwORATION (Y GCVCHTY CcVCN ONOVC GTRCCT RUTI,ANo, Vl31(MONT OG701

""' ' i VYV-3852

• l'. O. DOX :57 VERNON, VCRMONT oS354 April 30, 1975 United States Nucicar Regulatory Commission , ,

Office of Inspection and Enforcement ,

' Region 1 , '

i.' ". .

631 Park Avenue King of Prussia, Pennsylvania 19406 -

4 i ATTENTION: James P. O'Reilly, Director

[

REFERENCE:

Operating License DPR-28 Docket No. 50-271 Abnormal Occurrence No. A0-75710 (24 Hour Report)

Dear Sir:

As defined by Technical Specification's for tho'Verment Yankee Nuclear.

j . Power Station, Section 6.7, we are reporting the following~ Abnormal

' Occurrence as A0-75-10 and confirming our telephone conversation with your office.

9 At approximately 1000 on April 29, 1975, while perfort5.fng a routine scheduled surveillance test, it was discovered that the. low water IcVel: >

switch associated with Differential Pressure Indicating Sensor 2-3-58B.

actuated at -18.0 inches water Icycl. Tabic 3.1.1 of the Technical i'.*'#< . Specifications requires that the trip level setting of this instrument be set to 21. inch water Icvol. Failure of this switch to actuate at the specificd trip 1cvel actting resulted in.fcuer.operabic, instrument channels por trip system than that required.by the Tabic. The switch was!immediately adjusted to actuate at a conscreative setting of 3.0 inches water Icvel.

The plant was operating at. full power at the time of this occurrence..

Very.truly yours,

,N. #

y

.Bradford W. Riley

[y ~ " ' ,

Plant = Superintendent.

. IIK/kbd ' ~

!i3315