ML20086E346

AO 75-03:on 750204,spray Sys Pump Discharge Pressure Sensor PS-14-44A Actuated at 82 Psig,Below Tech Spec Min. Sensor Replaced & Calibr

ML20086E346
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	02/05/1975
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086E261	List: 05000271/LER-1975-003, Corrected LER 75-003:on 750204,core Spray Sys Pump Discharge Pressure Sensor PS-14-44A Actuated at 82 Psig.Caused by Setpoint Drift.Sensor replaced.W/750218 Ltr ML20086E346
References
AO-75-03, AO-75-3, VYV-3642, NUDOCS 8312060464
Download: ML20086E346 (1)

Text

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N..m VERMONT YANKMM NUCLEAR POWER CORI?OR ATION

'\K SCVENTY SCVEN OROVC STRCCT RUTLAND, VP.ICMONT 05701 VYV-3642 P.O. BOX 157

- .VCRNON, VCRMONT oS354 February95, 1{ 7.5C.

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Director ~ gg ';{/5 > ;S Directorate of Regulatory Operations, Region I t'

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United States Atomic Energy Commission 1

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631 Park Avenue *

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King of Prussia, Pennsylvania 19406, A -

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REFERENCE:

Operating License DPR-28 .

Docket No. 50-271

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- Abnormal Occurrence No. A0-75-03 (24 Hour Report)

Dear Sir:

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f - As defined by Technical Specifications for the Vermont Yankee Nuc1 car vnuar n e n H . .n . nc,tfon 6.7. we are reporting the following Abuormal

. Occurrence as A0-75-03 and confirming our telephone conversation with l .,your office.

At approximately 0930 on February 4, 1975, while performing a monthly.

. functional tcat on the Core Spray System, the-Core Spray System Pump Discharge Pressure sensor PS-14-44A actuated at 82 psig. Table 3.2.1 of

- the Technical Specifications requires that the trip level setting of tiiis censor be set at >100 psig.

Failure of this sensor to actuate at the  :

specified trip level setting resulted in fewer operable instrument channels-

- per trip system than that required by Tabic 3.2.1 cf the Technical Specifications. Functionally, this sensor operates as a pressure permissive

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. in the Automatic Depressurization System indicating the fact that a core {

spray pump is running. ,

j The sensor was immediately replaced and the trip icvel setting adjusted ~

'to,110 +5 psig which precluded the necessity of performing the ' action

[. specified in Note 2 of Tabic 3.2.1 of the Technical-Specifications. The e

plant was operating at full power at the time of the discovery of this .

. . occurrence. .

Very truly yours, 8312060464 750214 r aoo"

. g.g 9 , pf,q Bradford W. Riley .. c -

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Plant Superintendent T.

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