ML19354D472

LER 89-005-00:on 891002,discovered That Tech Spec Action Statement Was Not Entered When safety-related Bus Was Removed from Svc.Caused by Procedural deficiency.Out-of-svc Procedure Will Be revised.W/891101 Ltr

ML19354D472
Person / Time
Site:	Braidwood
Issue date:	11/01/1989
From:	Querio R, Wagner J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
BW-89-2077, LER-89-005-10, LER-89-5-10, NUDOCS 8911090284
Download: ML19354D472 (4)

Text

-. .

c +' ~ Commonwealth ESton l

' ' ' c [' ' Br:ldwood Nuclzt P!w:r Station .l 4 ~, , .. , - .s

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J. Rout) c1, Br:cevill Box 84

. Illinois '

60407:

N'j Telephone 815/458 2801 - ]

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November 1,1989 BW/89-2077 . ,

i U. S. Nuclear Regulatory Commission l

. Document Control Desk Washington, D.C. 20555- >

Dear Sir:

I The enclosed Licensee Event Report from Braidwood Generating >

. Station is being transmitted to you in accordance with the requirements of l 10CFR50.73(a)(2)(1) which requires a 30 day written report. l

.t This report is number 89-005-00; Docket No. 50-457.

Very truly yours, ,

Y R. E. Querto l Station Manager Braidwood Nuclear Station REQ / ADS /sjs '

(7126z)

Enclosure:

Licensee Event Report No. 89-005-00  ;

cc: NRC Region III Administrator NRC Resident Inspector INPO Record Center CECO Distribution List 8911090284 891101 PDR S ADOCK 05000457 PDC ff i

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, LICEN$tt EVDif REPORT (LER) g Mi facility Name (1) Docket Number (2) Pane (3) arald .d 2

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of si of ol el 41 s1 7 1 leflcl3 ,

Title (4)'

Failure to Consider ESF Bus Outmas tifacts en Donosite Unit Dge_to Procedural Deficionev

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Event Date (5) LER " der (6) Ecoort Date (7) Other Fhellities involved _(8)

Month Day Year Year /// Sequentfa1 /// Revision Month Day Year Facility 's Decket Numberjs) fff Number _ ffd Number NONE 01 El el 01 of l L_

11 e el 2 JL.5L _al 9 oIoIs oIo 1i1 of I el 9 ofsiofofof I I OPERATING fCheck one er more ef the fellowina) i11) 1 _ 20.402(b) 20.405(c) .__. 50.73(a)(2)(iv) _ 73.7)(b)

POWER ___ 20.405(a)(1)(1) _ 50.36(c)(1) __._ 50.73(a)(2)(v) __ 73.71(c)

LEVEL' 20.405(a)(1)(ii) .__ 50.36(c)(2) ___ 50.73(a)(2)(vii) _ Other (Specify (10) !9l9 _._ 20.405(a)(1)(ill) _E_ 50.73(a)(2)(1) _ 50.13(a)(2)(viii)(A) in Abstract

/ /,/,/ / / / / / / / / / / / // / /,/,/,/, / / / / _ 20.405(a)(1)(iv) _ 50.73(a)(2)(ll) _ _ _ 50.73(a)(2)(viii)(B) below and in

/}/////////////////}j}/',////

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// / 20.405(a)(1)(v) _ 50.73(a)(2)(til) 50.73(a)(2)(x) Text)

LIEEN WE CONTAtt FOR THIS LER (12)

Name TELFPDONE NLASER AREA CODE

.1erry Waoner. Reaulatory Assurance Ext. 2497 8l1l5 41 El 81 l 21 Bl el COMPLETE ONE LINE FOR EACH COMPON N FAILURE L,ESCRIBED IN THIS REPORT (13)

CAUSE SYSTEM COMPONENT MANUFAC- REPOR1ABLE CAUSE SYSTEM COMPONENT MANUFAC- REPORTABLE TURER To NPRD$, TURER TO NPRDS I I I I I I I I I I I I I I I Il I I I I I I I I I I I SUPPLEMENTAL REPORT EXPECTED (14) Expected Month l Dav I YeAI Submission

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1 I Date (15) 1 l I l lyes (If ves, complete EXPECTED SWEfil$119NJATE) X l NO l ADSTRACT (Limit to 1400 spaces, i.e. approximately fif teen single-space typewritten lines) (16)

At 1638 on October 2, 1989 a Unit 1 Safety Related bus was removed f*om service. The Unit I and Unit Common T;chnical Specification action statements were entered. The review did not consider the impact on Unit 2.

l- The bus was part of the AC power Sources requirement for Unit 2. The action statement provided for the bus to be inoperable for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. This provision specified that operability of the remaining sources be verified by performing surveillance requirements at an increased f requency. perfomance of a Specification which consists of breaker alignment and bus voltage verification was required within 1 bour and every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. At 2053 a supervisor discovered that the Action Statement had not been entered for Unit 2 when the bus was removed from service. At 2110 the requirements of the action statement were completed with l' acceptable results. This exceeded the within one nour" f reque.ity t y 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> and 32 minutes. The cause of this event was a procedural deficiency. The Out-of-Service Procedure was structured in a unit specific f emat . This created a mind set that did not key the reviewer to consider the impact on the opposite unit.

Tha Specification was inwnediately performed. The Out-of-service procedure will be revised to include a check l

off block for the opposite unit. There have been n9 previous occurrences.

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FACILITY NAst (1)' DOCKET te M ER (2) lea tasara is) Paan (3) i Year /// Setvential //j/ Revision fff ff

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TEXT Energy Industry Identification System (EII$) codes are identified in the text as (XX) ...

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. A. ~ptANT CONDITIONS PRIOR TO EVENT:.

. Unit: .Braldwood 2; Event Date: October 2. 1989; Event Time: 1638; Mode: 1 - Power Operation; Rx Power: 99%;

L RC$ (AB) Temperature / Pressure: NOT/NOP degrees F/ psig .

-B. DESCRIPTION OF EVENT:

At 1638 on October 2, 1989 Bus 141 (AP) ((A), one of the redundant $afety Related electrical AKV busses on Unit 1, >

cas removed f rom Service. The appitcable Unit 1 and Unit Common Technical Specification action statements were ,

entered and compiled with. The initial review for Technical Specification oppilcability did not consider the p

impact on Technical $pecifications for Unit 2.- f,,

t 4KV Bus 141 was part of the AC Electrical Power Sources required to be operable for Unit 2. This was in L

.accordance with technical $pecification 3.8.1.1. The action statement provided for Bus 141 to be inoperable for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. This provision specified that operability of the remaining AC Sources be verified by performing survelliance requirements on the remaining AC Sources at an increased frequency. Perforinante of Specification 4.8.1.1.la, which consists of Breaker alignment and Bus voltage verification was required within I hour and every ,,

8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter.

At 2053 the Station Control Room Engineer ($CRE) ($R0 Licensed Supervisor) discovered that the Action Statement for Unit 2 Technical $pecification 3.8.1.1 had not been entered when Bus 141 was removed f rom service. The SCRC immediately entered the Action $tatement.

At 2110 $pecification 4.8.1.1.la was completed with acceptable results. This exceeded the "within one hou*"

frequency by 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> end 32 minutes. All other actions were completed within the time intervals specified in the l Action Statement and found acceptable.

'This event is being reported pursuant to 10CFR50.73(a)(2)(1) - any operation or condition prohibited by the

.-plant's Technical $pecifications.

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I C. CAUSE OF EVENT:

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1 E 'The root cause of this event was a procedural deficiency. The Out-of-Service Procedure. BwAP 330-1 and its attachments, are structured in a unit specific format with individual color coded forms for each unit. The structure of the procedure and the proe s It governs created a mind set that did not key the Technical ,

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~ $pecification applicability reviewer t*. "cisider the impact or. the opposite unit.

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FACILITY M4pt (1) DOCKET NUPSER (2) LEn naamre (6) Pana (31 j

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""r /// pkmher y traidwood 2 o I s I e I o I o i 41 51 7 sI9 - ol0l$ - olo el 3 of of 3 s.

TEXT Energy Industry Identification System (E!!$) codes are identified in the text as (KX) 1

9. SAFETY ANALY$l$:

This event had no effect on the safety of the plant or the pubilc. Specification 4.8.1.1.la is an " instant in time" verification of items which have continual monitoring and alarm function in the main control room.

Under the worst case condition of operation without the AC power Sources provided by the opposite unit's 4KV E$F busses there would sill) be no effect as this is enveloped in Section 8 of the Updated Final Safety Analysis

~R: port (UFSAR). The Diesel Generators (DG) (EK) are the Emergency Power Sources for the Unit 4KV E$F Busses. One of the two redundant DG's are sufficient for the assumptions of the UFSAR. Both Unit 2 DG's were operable and evallable for this event.

E. CORRECTIVE ACTIONS:

Specification 4.8.1.1.la was immediately performed and found satisf actory for the remaining AC Sources.

The Out-of-Service procedure will be revised to include a check off block on the Outage Forms for consideration of h Technical Specification appitcability for the opposite unit. This wlil be tracked to completion by action item 4 457-200-89-08201.

F. PREVIOUS OCCURRENCES:

NONE G. COMPONENT FAILURE DATA:

NONE 29122(103089)/4

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