ML20086D792

AO 73-08:on 730307,time Delay Relay Failed to Actuate Isolation of Sys within Specified Time.Relay Replaced & Tested

ML20086D792
Person / Time
Site:	Vermont Yankee
Issue date:	03/08/1973
From:	George Thomas VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086D786	List: ML20086D784 ML20086D792
References
AO-73-08, AO-73-8, VYV-2500, NUDOCS 8312050120
Download: ML20086D792 (2)

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l VERMONT Y NICas NUCLsAR POWER CORPORATION' , _ ..

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! RUTLAND,iVEMtONT CS708 '

VYV :2500 "P. O. SOM 167 VERNON. VERMONT e6364

. March 8. 1973

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United States Atomic' Energy Commission .

E Directorate of Regulatory Operations,' Region I

'970 Broad. Street .

/ Newark. New Jersey '07102' i i

REFERENCE:

<0perating ' License iDPR-28  ;

3 Docket'No.(50-271 .

. Abnormal Occurrence No;. AO-73 08 . _. .

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identlemen: .

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As defined'by Technical Specifications for the-Vermone' Yankee- -

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Nuclear' Power Station. Section. 6'.7.'A.c, we are reporting .the.,following <

Absormal Occurrence as A0-73-08 and confirming our telephone, conversation '

with .your . office  :

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[ . At approximately 1420.on March 7,1973 while performing routine- . .

surveillance on the RCIC system, a time delay relay failed.to actuate . " '

an isolation of the systen within the 30 iS ninutes specified :hy Table ~3.2.2.3 of the Technical Specifications. The time delay . relay, , .

13A-K41, which initiates an isolation of the.RCIC ayaten upon receipt ' j of a high temperature signal in the Main Stean.Line 'Ibanel did not' . ,  ;

operate until 40 minutes after a simulated-high temperature was induc(d  :

on the logic. 'the reactor was operating at.appgoziantely;751,atattye" '

time of this incident. ( .,

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'The RCIC Lisolation valves were closed as spYcified by Note' 3aof [ E Table 3.2.2.3 of the Technical Specifications and. testing.of.the1HPCI .

systen was started as s cecified in-Section 3.5.G.2. : A new. relay 4was bench tested for the correct time delay and installed in the ROIC i system. The RCIC aystem logic test was .then conducted and"the new -

relay was verified to operate. properly and ithe system was back 'in servies at 1725 on March 7,<1973.

_,' Very truly.yours, f VERMONT YANKEE NUCLEAR POWER,.CORFORATION 3 5

. 8312050120 73030s

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/ (5) j DR Central Files (1) em -~The attached report from the subject licensee is j Regulatory Standards 3) l Dir. of I.icensine. (13

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i forwarded in accordance with RO Manual Chapter 1000.

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