ML20043D059

LER 90-008-00:on 900502,ESF Actuation of Control Room B Emergency Ctk Ventilation Makeup Fan Occurred.Caused by Procedure deficiency.LTS-800-205 & Similar Procedures Will Be revised.W/900601 Ltr

ML20043D059
Person / Time
Site:	LaSalle
Issue date:	05/18/1990
From:	Diederich G, Kollross C COMMONWEALTH EDISON CO.
To:	Office of Nuclear Reactor Regulation
References
LER-90-008-02, LER-90-8-2, NUDOCS 9006070062
Download: ML20043D059 (4)

Text

.- _ --- -. -_. .-

1

/ Comm:nwrith Edison  ;

e. / e LaSalle County Nuclear Station l

' , i, ' _,! Rural Route #1, Box 220 1

\ 's Marseilles, Illinois 61341 J Telephone 815/357 6761 J l

i June 1, 1990 I

l Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Comunission Mail Station P1-137

-Washington, D.C. 20555 -

0 ear Sir: -

Licensee Event Report #90-008-00, Docket #050-374 is being submitted to your office in accordance with 10CFR50.73 (a)(2)(iv).

O O. J. Died rich Station Manager LaSalle County Station GJD/CTK/ls Enclosure l- xc: Nuclear Licensing Administrator-l' NRC Resident Inspector NRC Region III' Administrator >

INPO - Records Center.

l 9006070062 900518 FDR ADOCK 0500g'g74 p

/ '\\

l

, LICENSEE EVENT REPORT (LER)

Fonn Rev 2.0 Facility N me (1) Docket Number (2) Pane (3)

LaSalle County Station Unit 2 015101010131714 1 _of!O 3 Title (4)  ;

Engineered Safety Feature Actuation of the control Room "B" Emergency CTK Ventilation hkeup Fan Event Date (5) LER Nunber (6) Report Date (7) Other Facilities involved (8)

Month Day Year Year /// Sequential /jj// Revision Month Day Year Facility Nmes Docket Nweer(s) fj/j

// Number f

/// Number l 01510101ol l I

~ -

01 5 01 2 91 0 91 0 010l8 0l0 015 11 8 91 0 0151010101-l l _

OP M ING THIS REPORI 15 $UBMITIED PURSUANT 10 THE REQUIREMEN15 OF 10CFR I (Check one or.nore of the followinu) (11) 20.402(b) _ 20.405(c) ,_X_ 50.73(a)(2)(iv) _ 73.71(b)

L POWER _ 20.405(a)(1)(1) _ 50.36(c)(1) _ 50.73(a)(2)(v) _ 73.71(c) l LEVEL i i _ 20.405(a)(1)(ll) _ 50.36(c)(2) _. 50.73(a)(2)(vil) _

Other (Specify (10) 0 10 10 _ 20.405(a)(1)(lii) _ 50.73(a)(2)(1) _ 50.73(a)(2)(viii)(A) in Abstract

/,/,/,//,/////////,/,/,/,/, _ 20.405(a)(1)(lv) _ 50.73(a)(2)(ll) _ 50.73(a)(2)(vill)(B) below and in l

'ffff/jff

{ ,/ // // /'j/j

/,/,/,/,/,/,/j/,fffff f/jf/ _ 20.405(a)(1)(v) _ 50.73(a)(2)(lii) _ 50.73(a)(2)(x) Text)

I tictNSEE CONTACT FOR THIS lER (12) l Name 1ELEPHONE NUSER-l AREA CODE l

C. T. Koltross. Technical Staff Encineer. Ext. 2772 8 l 1 15 315171-l617161I

. CO @ TETE ONE LINE FOR EACH COMPOW NT FAILURt DESCRIBE 0 IN THIS REPORT (13)

CAUSE SYSTLM COMPONENT MANUFAC- REPORIABLE CAUSE SYSTEM COMPONENT MANUFAC- REPORTABLE l TURER 10 WPRDS TURER TO NPRDS 0 VII I I I I I I N I I I I I l l l l l l l- 1 I I I I I I I I I SUPPLEMENTAL REPORT EXPECTFD (14) Expected Month I Day l Year l Submission O

lyes (if yes, complete EXPECTED SUBMIS$10N D".TE) X l NO l ll ll ABSIRACT (Limit to 1400 spaces, i.e, approximately fifteen single-space typewritten lines) (16) l On my 5,1990 at approxinutely 1752 hours0.0203 days <br />0.487 hours <br />0.0029 weeks <br />6.66636e-4 months <br /> with Unit 2 defueled, while perfonning LaSalle Technical Staff Surveillance L15-800-205, "2A Olesel Generator 24 Hour Run" (DG), Unit 2 Division 2 bus 242Y was l de-energized, the 2A DG started, and energized the bus as expected. When the bus re-energized, the Control l Room "B" Emergency Makeup Ventilation Fan (0VC03CB) (VC) auto started due to a false VC High Radiation l initiation caused by the loss of power supplied to the Control Room Radiation Monitors. The VC system functioned as designed, however the auto start of the VC Onergency Nkeup Fan was not anticipated by the procedure prior to de-energizing the bus 242Y. The fan was reset after the conpletion of L15-800-205.

l l The apparent cause of this event was a procedure deficiency. LTS.-800-205 does not address the start of the l

'B" VC Emergency Makeup Fan when bus 242Y is de-energized and subsequently re-energized.

L15 800-205 and similar procedures will be revised to address the VC "B" Emergency Makeup Fan actuation prior to energizing bus 242Y. In addition, steps will be added to reset the VC system prior to returning the l system to its normal operating mode.

This event is reportable pursuant to the requirements of 10CFR50.73(a)(2)(iv) due to the actuation of an Engineered Safety Feature System.

1

,_ ' LICENSEE EVENT REPORT (LER) TEXT COWilNUATION Fom Rev 2.0 FACILliY.Nhm (1) DOCKET NU SER (2) LER IH OER (6) Pm (3)- ,

o Year- Sequential Revision

///

ffj ///j ff i// Nunker /// Naber tasalle County Station unit 2 0 1 5 1 0 1 0 1 0 1 31 71 4 910 - 0101e - 'o10 01 2 0F 0],3 TEXT -EnergyindustryIdentificationSystem(Ells)codesareidentifiedinthetextas[XX]

PLANT AND SYSTEM IDENTIFICATION General Electric - Solling idater Reactor s

EnergyIndustryidentificationSystem(Ells)codesareidentifiedinthetextas[XX).

A. CON 0lil0N PRIOR TO EVENT Unit (s): 2 Event Date: 5/2/90' Event Time: 1753 Hours Reactor Mode (s):- Defueled Mode (s) Name: Defueled Power Level (s): ,,05_

8. DESCRIPTION OF EVENT On May 5, 1990 at approximately 1747 hours0.0202 days <br />0.485 hours <br />0.00289 weeks <br />6.647335e-4 months <br /> with Unit 2 defueled, while performing LaSalle Technical Staff Surveillance LTS-400-205, "2A Diesel Generator 24 Hour Run" (DG) [EK), Technical Staff personnel began preparation to verify that the 2A DG would auto start and load Unit 2 Olvision 2 bus 242Y (AP)[E8) '

on a simulated undervoltage signal as directed by the test. At approximately 1752 hours0.0203 days <br />0.487 hours <br />0.0029 weeks <br />6.66636e-4 months <br />, bus 242Y was de 4ne.rgized, the 2A DG started and energized the bus as expected. When the bus re-energized, the Control Room "B" Emergency Makeup Ventilation Fan (0VC03C8) (VC) [VI] started automatically due to a false VC High Radiation initiation caused by the loss of power supplied to the Control Room Radiation +

Monitors. The VC system fuisctioned as designed, however, the auto start of the VC Emergency Makeup Fan was not anticipated by the procedure prior to de-energizing the bus 242Y. The high radiation signal was reset and the VC Emergency Makeup Fan (0VC03C8) shutdown after the conpletion of L15-800-205. This

. event is reportable pursuant to the requirements of 10CFR50.73(a)(2)(lv) due to the actuation of an Engineered Safety Feature System.

C. APPARENT CAUSE OF EVENT The apparent cause of this event was a procedure deficiency. LTS-800-205 does not address the start of the_"B" VC Emergency Makeup Fan when bus 242Y is de-energized and then re-energized.

This type of actuation may have occurred previously during this type of testing. This procedure and similar procedures which de-energize the Division 2 busses have been perfomed previously without ESF actuations being reported, it is possible that the associated system was not available or more likely the personnel involved were aware that this would occur and therefore anticipated the actuation or took action to prevent it. Recently, the station has required that these types of ESF actuations be explicitly identified in the procedure to ensure all personnel are aware that the actuation will occur.

-If not so identified, the event is classified as reportable.

l l

LICENSEE EVENT REPORT (LER) TEXT CONTINUATION Fom Rev 2.0 FACILith NAME (1) DOCKET Nu mER (2) LER WUefR (6) Pace (3) ,

' Sequential Year /// ///j Revision fff ff

/// Number /// Weber Lasalle County station unit 2 0 1 5 1 0 1 0 1 0 1 31 71 4 910 -

0101e -

01 0 01 3 or 013 1 EXT Energy Industry Identification System (Ells) codes are identified in the text as [XX)

D. SAFEiY ANALYSIS OF EVENT-The VC system functioned as designed. At the time of the event, both VC Energency Makeup systems were operable. This event did not cause the VC system to become inoperable.

E. CORRECilVE ACTIONS L15-800-205 will be revised to address the VC "B" Emergency Makeup Fan starting prior to perfoming the i steps whert, bus 242Y is de-energized. in addition, steps will be added to reset the VC system logic prior to reti. ning the system to its nomal operating mode. These same changes will also be incorporated l u L15-800-105 "lA DG 24 Hour Run" L15-500-110 " Unit 1 Division 2 ECCS Response ilme ,

Test", and LTS-500410 " Unit 2 Division 2 ECCS Response ilme Test." These survelliances will also start the VC "A" and/or "B" 9ergency Makeup Fans by de-energizing and re-energizing their respective bus (142Y and/or 242Y). Acth;n item Record (AIR) 374-200-90-03301, has been initiated to track coupletion of these procedure revisions. AIR 374-200-90-03302 has been initiated to review operating procedures and abnormalltles associated with de-energizing ESF busses to detemine if any changes are required.

F. PREVIOUS EVENTS None.

[

G. COMPONENT FAILURE DATA Manufacturer Nomenclature Model Number MFG Part Netwr N/A N/A N/A N/A i

i l-l l

i

!