ML20028H739

LER 90-007-01:on 900622,containment Entry Performed to Determine If Flanges Installed,Per Info Notice 90-019. Flanges Immediately Removed.Caused by Procedural Deficiency. Transfer Canal Draining Procedures revised.W/910123 Ltr

ML20028H739
Person / Time
Site:	Beaver Valley
Issue date:	01/23/1991
From:	Noonan T DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEIN-90-019, IEIN-90-19, LER-90-007, LER-90-7, ND3MNO:3093, NUDOCS 9101290304
Download: ML20028H739 (6)

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now ame P O D). 4 snwngut e4 iscr-cow January 23, 1991 ND3MNO:3093 Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 LER 90-007-01 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen:

In accordance with Appendix A, Beaver Valley Technical Specifications, the following Licensee Event Report is submitted:

LER 90-007-01, 10 CFR 50.73.a.2.li, " Operation With Refueling Cavity Drain Flanges Installed".

Very truly yours, n.. uswa/G/et gi T. P. Noonan General Manager Nuclear Operations DC/sl Attachment 9101290304 910123 Y

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ADOCK 05000412 PDR

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'* e January 23, 1991 ND3MNO:3093 Page two ec: Mr. T. T. Martin, Regional Administrator United States Nuclear Regulatory Commission Region 1 475 Allendale Road King of Prussia, PA 19406 C. A. Roteck, Ohio Edison 76 S. Main Street-Akron, OH 44308 Mr. A. DeAgazio, BVPS Licensing Project Manager Ur.ited States Nuclear Regulatory Commission Washington, DC 20555 J. Beall, Nuclear Regulatory Commission, BVPS Senior Resident Inspector Larry Beck Cleveland Electric 6200 Oak Tree Blvd.

Independence, Ohio 44101 INPO Records Center Guite 1500 1100 Circle 75 Parkway Atlanta, GA 30339 G. E. Muckle, Factory Mutual Engineering 680 Anderson Drive #BLD10 Pittsburgh, PA 15220-2773 Mr. J. N. Steinmetz, Operating Plant Projects Manager Mid Atlantic Area Westinghouse Electric Corporation Energy Systems Service Division Box 355 Pittsburgh, PA 15230 Mr. Richard Janati Department of Environmental Resources P. O. Box 2063 16th Floor, Fulton Building Harrisburg, PA 17120 Director, Safety Evaluation & Control i

Virginia Electric & Power Co.

P.O. Box 26666 One James River Plaza Richmond, VA 23261 L

January 23, 1991 ND3MNO:3093 Page three W. Hartley Manage)ent Analysis Company 112671 High Bluff Drive San Diego, CA 92130-2025 J. M. Riddle NUS Operating Service Corporation Park West II Cliff Mine Road Pittsburgh, PA 15275

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A FOM 3e6 U 6. NUCLE AR RtQULATORV COMMisslON APPROVic oms NO.31600103 thPIRES 4/30/92

. . ESTIMATED BuseDEN PER RESPONSE TO COMPLY WTH THtS LICENSEE EVENT REPORT (LER) u"INTiUOARVIEfU"o"#E#iAY?T"L*R CO lO ioi O!U A',o"R? t 0JM ia'?.U.'SA'R L'st%V O PM AGfM N AND UD ff W H GT N C 11603 f t.CILIT h NAME 111 DOCKlf NUMSER UI P AGE I3' Beaver Valley Power Station Unit 2~ o Is I o l0 l o l 4l 112 1 lor l 013 q TITLE 146 Operation with Refueling Cavity Drain Flanges Installed IVINT DATE lli L8R NUM8tR I6t REPORY DAf t (7) OTMtR F ACILITIES INVOLVED 18)

MONTP DAY vtAR vtAR 5'(%y'f' ",7f,@ uCNTH OAv ytaR #acits,v hawas DOCKtt NUMstm+st N/A o16[o[01ol l l 0j0l7 Oj6 2l2 90 9l0 0l1 0l1 2l3 9 l1 o,sioio,o, l i 088 R ATINO THIS REPORT 18 $USMITito PURSUANT TO THE AkOUIREMENTS Of 10 CFR 5- (CA+ca eae e, more o' t** fono**si n11 "oot 81 1 a 40:m n 40 i.i .0 n.H2 H,o n rim 20 406(eH1Hil 60 364sHO to 73taH2Hvl  ?) filel n o, 1 0i0 n .0 1.Hi H. ux.Hu o ns.,aHvo .

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20 4084sH1Hivl X so m iuHe e0 man =nsi 20 40stelt1Hvi 8173teH2Hsill 60 73:eH2Hel LICEN$tt CONT ACT FOR THl4 Ltm 1131 NAME TELEPHONE NUM8tR Ante CQQt T P. Noonan, General Manager Nuclear Operations 4l1l2 6 4l 31 -i 112 l 518 1

COMettTE ONS LINE FOR S ACH COMPONENT f AILURE OtsCRIS40 IN TH18 REPORT 113)

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1 1 l I I I I 1 I I I I I I SUPPLtMINTAL REPORT EXPICitD 114) MONTH DAY YEAR 3L 6M 3360N yt$ lif ve,. temswete ik!LCTRO SUBwS$10k OA Til NO l l l un R ACT m-, R, ,a (. . ,.. , , aN , ,y. ,Ru, ,, ,,,,.o ) n ei During- review of IE Notice 90-19, Potential Loss of Effective Volume.for Containment Recirculation Spray at PWR Facilities, no documentation could be found verifying the removal of Unit 2's-Refueling Cavity Transfer Canal drain flanges. The UFSAR assumes these flanges are removed during power operation to prevent the transfer canal from acting as a catch basin in the event of a containment spray actuation. On 6/22/90, a containment entry was-performed to determine if the flanges were installed. The flanges were found to be installed and were immediately removed.

The . flanges were left installed due to a deficiency in the transfer- canal draining procedure. This procedure has been revised to verify that-the flanges are removed after the canal is

-drained. There were no safety implications due to this event.

'An engineering evaluation has verified that the containment spray system was still operable while the flanges were installed.

NRC Pere 364 HHl9)

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f WPIRt$ 4/30/92 8 C LICENSEE EVENT REPORT (LER) lNM,^'#,A""80tM"o "'MEL"',0 f 7,',' ,"o',"W A'"'S TEXT CONTINUATION CU"R t ,'AWu^hd ?,M n'CL"','!# '"s" u "$EMA 1 PAPE RWO K RE CTtDN J b 0 0 BC CF MANAGE MENT ANO subG(T, WASH!NGTON.DC 20603 F4.CILITY NAML fil DOC K E Y NUM81R 12' LtR NU418tR(68 PAGE (33 naa " $'?,h "'#0 Beaver Valley Power Station Unit 2 0 l5 l0 l0 l0 l 4l1 l 2 9l0 -

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0I1 0l2 OF 0l3 f tXT ,# more apen e asevred, ese e&seener NRC Form JseWs11171 Descriotion of Event IE Notice 90-19, Potential Loss of Effective Volume for Containment Recirculation Spray at PWR Facilities, discussed the potential for sections of a PWR's refueling cavity to act as a catch basin in the event of a containment spray actuation. By preventing some of the spray water from entering the containment sump, . insufficient volume might be available for subsequent recirculation spray. Beaver Valley's Independent Safety Evaluation Group (ISEG) reviewed the concerns of this Notice against Beaver Valley's design to determine if such an event could occur. ISEG did identify that the refueling cavity transfer canal at Beaver Valley Unit 2 could act as a catch basin for a significant volume of water (approximately 24',800 gallons).

However, the canal was provided with two drains in the original plant design. The drains were designed to be closed with blind flanges during refueling.

ISEG attempted to verify that the Refueling Cavity Transfer Canal drain flanges had been removed following Unit 2's first refueling outage (completed in June 1989). No documentation of flange removal could be located.

On June 22, 1990, the Operations group made a containment entry to determine if the flanges were still in place. The flanges were discovered to be in place. The flanges were immediately removed.

Cause of Event This event was caused by a procedural deficiency. No procedure existed to remove the flanges following a refueling outage.

Corrective Actions The transfer canal draining and the containment closecut procedures have both been revised to verify that the crain flanges are not left installed.

An engineering evaluation of the operability of the containment quench spray and recirculation spray system has been- performed.

This evaluation verified that the system remains operable while the transfer canal drain flanges are installed.

N?.C f orm 386A (649) 1 -

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NRC FQ282 3464 U.S. NUCLEAR ftEQULATORY COMMI54 TON

, E XPIRIS 4/30/92 u " c LICENSEE EVENT REPORT (LER) ,'Sg^4'r%*s gEP1,o"'@,$',17 o 7,V ,*o'," 1"'!

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, 'y" Pout'C0'^/!2U '*s' "MU 1 P APE RWO RED T TON R J 0 [O I OF MANAGE MENT AND DVDGET, WASHINGTON, DC 20603.

f ACILilY NAME lil DOCKtT NUMSER (2) LER NUMBE R 161 PAGE (3) n'a "t0 P.*' "'a*J:

Beaver Valley Power S*.ation Unit 2 rwru ,, e m .~ wwc m umn 0 l510 l010 l 4l1 l 2 9l0 -

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0l 1 0l3 OF Ok Provirig_s_,Simi1ar s Events Review of station records show no previous similar events.

Safety Implications There were no safety implications due to this event. Beaver Valley Unit 2 UFSAR assumes that the blind flanges on the refueling cavity transfer canal drains are open during operation to allow water from containment spray _to reach the recirculation spray pump sump. The concern with having this water available in the sump is to ensure sufficient available Net Positive Suction Head _(NPSH) to the recirculation spray pumps. Using conservative methodology, the UFSAR shows that the available NPSH is greater than the required NPSH. This calculation was reevaluated and verified that sufficient NPSH would still be available when the transfer canal drains are blocked.

During their review of IE Notice 90-19, the ISEG also considered the design'for Beaver Valley Unit 1 against the concerns of the notice. Although in a different configuration, Unit 1 also has drain lines off its refueling cavity transfer canal. However, the NPSH design analysis for Unit l's recirculation spray pumps assume. that Unit l's canal drains are closed and that the canal does act as a catch basin. Even without the water held in the transfer canal, Unit l's recirculation spray pumps have sufficient NPSH to remain fully operable.

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NRC F.rm 366A (6491

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