ML20086D620

AO 73-19:on 730625,during RCIC Surveillance Testing to Check Auto Closure of RCIC Steam Isolation Valves 15 & 16,valve 15 Failed to Close as Required.Several Attempts Made to Close Valve Remotely from Control Room Panel W/No Success

ML20086D620
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	06/25/1973
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086D614	List: ML20086D611 ML20086D620
References
AO-73-19, VYV-2751, NUDOCS 8312020424
Download: ML20086D620 (2)

Text

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)) hlCRMONT YANbE NUCLEAR POWER RPORATION

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ScVcN TY Gr,VcN OROVC STHcCT RUTI,AND, VEltMONT 03701

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VYV-2751 g

VERNON. VERMONT 05354

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g June 25, 1973 United States Atomic Energy Cor. mission birectorate of Regulatory Operations, P.cgion I b

970 Broad Street I

Newark, New Jersey 07102

REFERENCE:

Operating License DPR-28

.f Docket No. 50-271 Abnormal Occurrence No. A0-73-19

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Centlemen:

• k As defined by Technical Specifications for the Vermont Yankee g

Nuclear Power Station. Section 6.7. A.c, we are re::orting the followinn n- - i n--..--~,

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r with your office.

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At approximately 1015 on June 25, during conduct of RCIC Surveillance

, L testing to check auto closure of RCIC steam isclation valves 15 and 16, valve 15 failed to close as required.

Several attempts were made to close this valve remotely f rom the Control Room panel with r. success.

The

.i.". Q inoperability of t.his valve exceeds the Limiting Condicion f or Operation

- '1 as defined by Sections 3.7.D.1 and 3.7.D.2 of Technical Specifications.

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Section 3. 7.D.1 requi res that, during reactor power operating conditions,

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.l all isolation valves listed in Tabic 3.7.1 shall be operabic except as 7

specified in 3.7.D.2.

Section 3.7.D.2 requires that in the event any isolation valve specified in Tabic 3.7.1 becomes inoperable, reactor power operation may continue provided at 1 cast one valve in each line having an

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inoperable valve is in the mode corresponding to the isolated condition.

The reactor was at approximately 78% power at the time of the incident.

Since the repair would require an outage, the plant elected to commence

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shut ting' down at' 1400,, June 25, rather than electing to close a second isolation valve in' this line.which would have allowed plant operation to continue for

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seven succeeding days. Plant cold shutdcun condition was achieved at 0653 on t.

June:.25.,. Inve,stigation of valve problem will be conducted during the shutdown.

..a Very truly yours,

! f.'O VERMONT YANKEE NUCLEAR POWER CORPORATION

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p 8312020424 730703

.j PDR ADOCK 05000271 A I

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PDR B.V. Riley h

4 Plant Superintendent h

DCG/kbd

s s.o Licensec:

Vermont Yank _ne Nuclear Power Cor,

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l Docket No.: 50-271

. H. D. Thornburg, oA -

Chief, FSSEB l,

Abnomal Occurrence:

A0-73-19 4

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..na.,n.o samaa atua as r

i RO:HQ (5)

E DR Central Files (1)

The attached report from the st.bject licensee is D it Regulatory Standards (3) 1, Dir. of Licensing (131 forvarded in accordance uith T:0 Manual chnnter 1Mn.

i o (u....no.,n.o se n ainas RO Files i

The action taken by the licensee is considered Central Mai1 & Files v mt appropriato.

Followup will be perfomed during

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the next in'spection a.s apnronriate.

Confes,nf i$

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rnotA (N.mo and 4,nio M MAAn$

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,s-the report have been foruarded to the PDR, Local i

R. T.Carlson, Chief.

2 Facility Operations PDR, NSIC, DTIE and State representatives. The Branch, RO:I licensco will submit a 10 day written report to

_w PHOM pc D/TE

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7/19/73 Licensing.

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