ML20086D708

Updated AO 73-15:on 730612,first-stage Turbine Pressure Permissive Pressure Switch 5-14A Failed to Actuate at Proper Setpoint.Switch Reset.Surveillance Test Will Be Conducted Again in 3 Months Rather than 6 Months

ML20086D708
Person / Time
Site:	Vermont Yankee
Issue date:	06/21/1973
From:	George Thomas VERMONT YANKEE NUCLEAR POWER CORP.
To:	US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086D712	List: ML20086D708 ML20086D722
References
AO-73-15, VYV-2742, NUDOCS 8312020463
Download: ML20086D708 (1)

Text

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I VERMONT YANt.'EE NUOLEAR POWER CORPORATION SEVENTY GCVEN OROVE STRCCT

' RuTLAND, VERMONT OG701 REPLY 70:

VYV-2742 p. o. nox 157 VERNON, VERMONT 05354 June 21, 1973 s9 Qs Director N - s Directorate of Licensing g k['I.J g,.h'[y U.S. Atomic Energy Commission '-

Washington, D.C. 20545 JUN 2 o 1973> rr '

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REFERENCE:

Operating License DPR-28 C 2[

Docket No. 50-271 N'"' L C' Y Abnermal Occurrence No. A0-73-15 /g

Dear Sir:

As defined by Technical Specifications for the Vermont Yankee u.. i , n -. . ,, . e 4 ,, , c o , , 4 m, u,i.u,a , ... . vo,nnve4ng eso enism 4ng Abnormal Occurrence as A0-73-15.

At approximately 1100 on June 12, 1973, while performing a calibration l in accordance with Tech. Spec. Table 4.1.1, the First Stage Turbine Pressure Permissive Pressure Switch 5-14A, which deenergizes relay 5A-K9A above 220 psia, failed to actuate at the proper setpoint. This sensor is required by Tech. Spec. Section 4.1. A to operate with the reactor mode sw!tch in the RUN mode. The reactor was operating at approximately 75% at the time of this occurrence.

The switch was reset f rom 235 psia to operate at a conservative setpoint of 207 psia and returned to service at approximately 1120 June 12, 1973. This is a Barksdale switch supplied by General Electric Co. and was part of an overall review of Barksdale switches conducted by GE in late 1972. We 'were to have been informed as to the results of review but to date have received no information relative to the reported problem.

The Plant Operations Review Committee reviewed the reported incident and recommended that the surveillance test be conducted again in three months rather than six months as required by Technical Specifications.

! ~,* 8312020463 730621 -

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VERM0?iT YANKEE, NUCLEAR POWER CORPORATION N f(

,9. ry j f, x 3 G. Thomas Assistant Plant Superintendent l1D 70 /

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