05000374/LER-1990-008

LER 90-008-01:on 900502,ESF Actuation of Control Room B Emergency Ventilation Makeup Fan Occurred.Caused by Procedure Deficiency.Procedure LTS-800-205 Revised. W/900713 Ltr

ML20055G846
Person / Time
Site:	LaSalle
Issue date:	07/13/1990
From:	Diederich G, Kollross C COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-008, LER-90-8, NUDOCS 9007240227
Download: ML20055G846 (4)

LER-2090-008,

Event date:
Report date:
3742090008R00 - NRC Website

text

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%' y- Ch Commonwealth Edison .

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) RuralRoute #1, Box 220LaSalle County Nucl:ar Station l

-\ Marseilles, Illinois 61341  !

\ Telephone 815/357 6761 l

'l July 13, 1990 l

Director of Nuclear Reactor Regulation l U.S. Nuclear Regulatory Commaission l Mail Station Pl-137 I Washington, D.C. 20555

Dear Sir:

Licensee Event Report #90-008-01, Docket 9050-374 is being submitted to your office to supersede previously submitted

'. report #90-008-00 to correct the event date found in the l

. Text of the report. j l

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, 7-G. J. Diederich fStationManager-LaSalle County Station OJD/DRR/ls-Rnclosure l.'

l xc: Nuclear Licensing Administrator i J NRC Resident Inspector l

NRC Region III Administrator-

l. IMPO - Records Center t

>1 1:

1 9007240227 900713 1

PDR ADOCK 05000374 g PDC 7

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q LICENSEE EVENT REPORT (LER) I Form Rev 2.0 facility Name (1) Docket Neber (2) l Pane (3)

LaSalle County Station Unit 2 nl 5101010131714! i of 0 3 Title (4) - Engineered Safety Feature Actuation of the Control Room "B" Emergency Ventilation Makeup Fan due to a Prc'cedural Deficiency l-Event Date (5) LER Neber (6) Report Date (7) Other Facilities involved (B)

Month Day Year Year // Sequential f/y/ Revision Month Day Year Fac111tv Names Docket Neber(s) gj/

N Neber /N Neber 0151010101 1 I

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L 01 5 01 2 91 0 91 0 0IoIB 011 017 113 91 0 01 51 01 01 01 I I l THIS REPORT 15 SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10CFR OPERA W (Check one or more of the followino) (11)

DE W 20.402(b) __, 20.405(c) _X_ 50.73(a)(2)(lv) ,__ 73.71(b)

PONER _ 20.405(a)(1)(l) ,,,_ 50.36(c)(1) 50.73(a)(2)(v) _ 73.7)(c)

LEVEL- g i _ 20.405(a)(1)(li) _ 50.36(c)(2) _ 50.73(a)(2)(vii) _

other (Specify l (10) 0 10 10 __, 20.405(a)(1)(111) ,__ 50.73(a)(2)(l) _ 50.73(a)(2)(vill)(A) in Abstract l

1. / / H

//g/yg/,g/y/y#y/yyjy/

g unu 20.405(a)(1)(lv) 50.73(a)(2)(li) 50.73(a)(2)(viii)(B) below and in  ;

j f33333333333 f33333333333320.405(anino _50.73(ananin) _50.73an2no inu LICENSEE CONTACT FOR THis LFR (12) l Name TELEPHONE NU SER AREA CODE C. T. Ko11ross. Technical Staff Encineer. Ext. 2772 8 l 1 15 315171-l6171611 i CO W LETE ONE LINE FOR EACH COMPONENT FAILURE Or. SCRIBED IN THIS REPORT (13) l l i CAUSE SYSTEM COMPONENT MANUFAC- REPORTABLE CAUSE SYSTEM COMPONENT MANUFAC- REPORTABLE TURER TO WPROS TURER TO NPRDS j 0 Vi1 1 I l l i I N l l l l l l l 1 I l l I I I l l ! I I I I SUPPLEMENTAL REPORT EXPECTED (14) Expected Month l Day l Year Submission

~ lyes (If ves, complete EXPECTED SUBMISSION DATE) YlNO l ll ll l ABSTRACT (Limit to 1400 spai.es, i.e, approximately fifteen single-space typewritten lines) (16) -

On May 2, 1990 at approximately F52 hours with Unit 2 defueled, while performing LaSalle Technical Staff l, Survelliance LTS-800-205, "2A Diesel Generator 24 Hour Run" (DG), Unit 2 Olvision 2 bus 242Y was l

de-energized, the 2A DG started, and energized the bus as expected. When the bus re-energized, the Control i Room "B" Emergency Makeup Ventilation Fan (0VC03CB) (VC) auto started due to a false VC High Radiation .

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 Emergency Makeup Fan was not' anticipated by the procedure prior to de-energizing the bus 242Y. The fan was reset after the completion of LTS-800-205.

I The apparent cause of this event was a procedure deficiency. LTS-800-205 does not address the start of the 1

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

LTS-800-205 and siellar 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 system to its normal operating mode.

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

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j LICENSEE EVENT REPORT (LER) TEXT CONTINUATION Fom Rev 2.0 FACILITY IWE (1). DOCKET NUSER (2). LER NUSER (6) Pane (3) ,

Year- Sequential /// Revision y ,

g//

/ thaber g/

// Number imlle Counti station unit 2 -

TEXT; 0 I s 1 0 1 0 1 0 1 31 71 4 910 - 01010 Energy Ir.dustry identification System (Ells) codes are identified in the text as (XX)

- 01 1 01-2 0F 01 3 lI PLANT AND SYSTEM IDENTIFICATION -

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.' General Electric - Bolling Water Reactor EnergyIndustryidentificationSystem(Ells) codes'areidentifiedinthetextas[XX). ,

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- A. -CON 0lil0N PRIOR _10' EVENT

~ Unit (s): 2 Event Date: 5/2/90 Event Time: '1752 Hours Reactor Mode (s): Defueled ' Mode (s) Name: Defueled Power Level (s): 05 ,i

8. DESCRIPTION OF EVENT On May 2,- 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, whlie' perfoming LaSalle Technical Staff Surveillance LTS-800-205, "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]

y on a simulated undervoltage signal as directed by the test. ' aroximately 1752 hours0.0203 days <br />0.487 hours <br />0.0029 weeks <br />6.66636e-4 months <br />, bus 242Y was de-energized, the 2A DG started and energized the bus as r" 4 een the bus re-energized, the Control Room "B" Emergency Makeup Ventilation Fan (0VC03CE

• f started automatically _due to a false VC High Radiation initiation caused by the'Ioss of g <

ed to_the Control Room Radiation >

Monitors. : The VC system functioned as designed, however, tO , , Jtart of the VC Emerency Makeup Fan was not anticipated by the procedure prior to de-energizing the bus 242Y. The high radiation signal w&s .

reset-and the VC Emergency Makeup Fan (0VC03C8) shutdown after the coupletion 'of LTS-800-205. This 'l event is' reportable pursuant to the requirements of 10CFR50.73(a)(2)(lv) due to the actuation of an

['

i Engineere<] 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 "8" VC. Emergency Makeup Fan when bus 242Y is de energized and then re-energized. -l This type of actuation may have occurred previously during this type of testing. This procedure and-siellar 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 Ilkely the personnel involved were aware that this would occur and therefore anticipated the' actuation or took' C 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.

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LMCEaKEE EVENT REPORT (LER) TERT COWilNUATION ..

Fore Rev 2.0 FACILITY NAME (1) DDCKET NUPSER (2) LER NHISER (6) Pace (3)

Year // Sequential / Revision

/j/jj/ //jj/

f Naber

/ Nebet. //

iaulle County station unit 2 ~ 0 1 5 1 0 1 0 1 0 1 31 71 4 't 10 - 010Ie - 01-1 01 3 0F 01 3 l TEXT Energy Industry Identification System (Ell 5) codes are identified in the text as [KK)

D. SAFETY ANALYSIS OF EVEN1 The VC system functioned as designed. At the time of the event, both VC Emergency Makeup systems were operable. This event did not cause the VC system to become inoperable.

E. CORRECTIVE ACTIONS LTS-800-205' will be revised to address the VC "0" Emergency' Makeup Fan starting prior to performing the steps where bus 242Y is de-energized. In addition, steps will be added to reset the VC system logic prior to returning the system to its normal operating mode. These same changes will also be incorporated into LTS-800-105 "1A_DG 24 Hour Run", LTS-500-110 " Unit 1 Division 2 ECCS Response Time Test", and LTS-500-210 " Unit 2 Division 2 ECCS Response Time Test." These surveillances will also start the VC "A" and/or "B" Emergency Makeup Fans by de-energizing and re-energizing their respective bus (142Y and/or 242Y). Action item Record (AIR) 374-200-90 4 330), has been initiated to track completion of these procedure revisions. AIR 314-200-90-03302 has been initiated to review operating procedures and abnormalities associated with de-energizing ESF busses to determine if any changes are required. -

F. PREVIOUS EVENTS None.

G. COMPOWENT FAILURE DATA Manufacturer homenclature  % I Number MFG Part Weber N/A N/A N/A N/A l

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