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
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)

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hlCRMONT YANbE NUCLEAR POWER RPORATION ScVcN TY Gr,VcN OROVC STHcCT RUTI,AND, VEltMONT 03701 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--..--~, - an n in -a -- ce a-- ...-.i-s.--- ---..----.s-- r with your office. w -

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 ,

inoperability of t.his valve exceeds the Limiting Condicion f or Operation 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, ,f .l 7

all isolation valves listed in Tabic 3.7.1 shall be operabic except as 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 -?~^

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 shut ting' down at' 1400,, June 25, rather than electing to close a second isolation

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valve in' this line.which would have allowed plant operation to continue for .

.m seven succeeding days. Plant cold shutdcun condition was achieved at 0653 on t. 5 June:.25.,. Inve,stigation

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• of valve problem will be conducted during the shutdown. .

Very truly yours,

! f.'O VERMONT YANKEE NUCLEAR POWER CORPORATION

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8312020424 730703 -

.jp PDR ADOCK 05000271 . .

S PDR #

B.V. Riley h AI . 4 Plant Superintendent 4 h

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Licensec: Vermont Yank _ne Nuclear Power Cor ,

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.>' H. D. Thornburg, oA - Docket No.: 50-271 Chief, FSSEB l, r 4 Abnomal Occurrence: A0-73-19 -

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DR Central Files (1) D it The attached report from the st.bject licensee is 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

Central Mai1 & Files v The action taken by the licensee is considered -

mt appropriato. Followup will be perfomed during

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the next in'spection a.s apnronriate. Confes,nf + it.

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,s- the report have been foruarded to the PDR, Local i , R. T.Carlson, Chief.

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

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7/19/73 Licensing. . !. ' ?7

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