05000397/LER-1987-001, :on 870317,standby Gas Treatment Sys Fans 1A1 & 1A2 Inadvertently Started During Performance of Electrical Troubleshooting Activities.Caused by Personnel Error. Personnel Counseled

:on 870317,standby Gas Treatment Sys Fans 1A1 & 1A2 Inadvertently Started During Performance of Electrical Troubleshooting Activities.Caused by Personnel Error. Personnel Counseled

ML17279A216
Person / Time
Site:	Columbia
Issue date:	04/16/1987
From:	Arbuckle J, Powers C WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
LER-87-001, LER-87-1, NUDOCS 8704220277
Download: ML17279A216 (9)

LER-1987-001, on 870317,standby Gas Treatment Sys Fans 1A1 & 1A2 Inadvertently Started During Performance of Electrical Troubleshooting Activities.Caused by Personnel Error. Personnel Counseled

Event date:
Report date:
3971987001R00 - NRC Website

text

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'NFORi IATION DISTR IBUTI 0 TEN (R IDS

- ACCESSION NOR: 8704220277 DOC. DATE: 87/0<~/16 NOTARY ZED:

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Washington Public Ps'~e AVTH. t tAt IE:

AUTHOR AFFIL,IATIQ.'4 ARBUCNLt.-:, J. D.

Washington Public Pouer Supply System POWERS, C. I'I.

Wasliington Pub lic Pcaer Supp i!I System REC IP. I Ih!'ll:-

REC IP I F. NT AFFILIATIOA DOCKET 050003'P7

SUBJECT:

LER 87-001-00: on 8/0317'tandby gas treatment sos 'fans 1Ai 1A2 inadvertently started dur ing performance of'lectrical troubleshooting activities. Caused bg personnel> "error.

Personnel counseled.

W/870416 ltr.

DISTRIBUTION CODE:

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TITLE: 50. 73 Licensee Event Report (I FR).

Incident Rpti etc.

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LlCENSEE EVENT REPORT (LER)

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Inadvertent Start of Standby Gas Treatment System Due to Personnel Error EVENT DATE ISI LER NUMSKR ($1 REPORT DATE (11 OTHEh fACILITIKSINVOLVED(Sl OAY YEAR YEAR i+ SOQVCNTIAL I.

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MONTH OAY YEAR On March 17, 1987 at 1705 hours0.0197 days <br />0.474 hours <br />0.00282 weeks <br />6.487525e-4 months <br />, Standby Gas Treatment (SGT) System Fans lAl and lA2 inadvertently started during the performance of electrical troubleshooting activities.

The inadvertent start was caused by a utility maintenance electrician who, durina an effort to determine why electrical strip heaters were not working in an SGT Filter unit, mistakenly pushed an SGT HAH

'rain Electrical Heating Coil control button (each SGT Train will start or stop if the associated Electrical Heatina Co'il is turned on or off).

As a result, SGT Fan lAl started and then subseauently tripped because the inlet damper was closed; accordingly, SGT Fan lA2 auto started.

After verification that no actual initiating condition existed, the HAH Train of the SGT System was returned to normal lineup and was tested to verify operability.

No problems were identified.

The personnel involved were

counseled and the event was discussed during Electrical Maintenance Shop Meetings.

No safety significance was associated with the event in that no actual initiating condition existed and the SGT System operated as designed.

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(Power Operation)

Event On March 17, 1987 at 1705 hours0.0197 days <br />0.474 hours <br />0.00282 weeks <br />6.487525e-4 months <br />, Standby Gas Treatment (SGT) System "AU Train Fans 1Al and 1A2 inadvertently started during the performance of electrical troubleshooting activities.

The, inadvertent start.was caused by a utility maintenance electrician who mistakenly pushed a button marked "Heater Control On" on SGT local heater control panel 1Al.

The troubleshooting activities were initiated by problems associated with inoperable Electrical Strip Heaters (ESHS) lA and 2A.

The heaters are locally controlled and maintain the charcoal filters 10'F above the design dew point when the SGT Systems are not operating.

It should be noted that at the time of the event, the RB" train of SGT was out of service for replacement of electric strip heaters and a Technical Specification LCO was in effect.

After a briefing on the troubleshooting plan in the Control Room, the electricians proceeded to the "A" SGT unit; however, at the local controls for Carbon Bed Heater No.

1 (for SGT Fan 1A),

no power was detected to the el ectrical con tactors.

The electricians phoned the Control Room to locate from where the Carbon Bed Heater No.

1 control box contactors were fed.

The Control Room Operator

replied, "MC7B.U The electricians misinterpreted the message as "MC78-8, apparently due to the background noise level.

The electricians then proceeded to the MC78-8 room where they found Clearance Order Tags hung for electrical strip heater replacement on the "8" train of SGT.

These tags were part of the overall tagout for equipment and personnel protection and were located on the Electric Heating Coils (EHCs) for the UB" train of SGT.

The coils reduce the humidity of the gas entering the SGT trains to less than 70K during operating conditions.

The location of the Clearance Order Tags for the UB" SGT train ESH work appeared to enforce the misconception that room MC78-8 was the correct motor control center.

While in room MC78-8, the electricians opened a breaker door identified as "Electric Heating Coil SGT-1AlU and noticed that the cable number in the breaker did not coincide with the work instructions.

Although the electricians decided that this was the wrong breaker, a phone could not be located, in the room and they continued the search for the correct breaker in room MC78-8.

NIIC SOIIM 3ddA (483 I

NRC Form 35SA (943)

LICENSEE EVENT REPORT (LER) TEXT CONTINUATION U.S. NUCLEAR REOULATORY COMMISSION APPRO(/EO OMB NO. 3(50-OIO5 EXPIRES: 8/3(rTIS FACILITYNAME (1I OOCKET NUMBER (1)

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An electrician then located a control panel identified as RSGT-EHC-lA1.R Mistaking UEHCU for REHS",

and thinking that the Carbon Bed Heater No.

1 control box contactors may have been deactivated, the electrician pushed a

green button marked "Heater Control On", thereby inadvertently starting SGT Fan lAl.

The lAl fan subsequently tripped because the inlet damper was closed.

As a result, SGT Fan lA2 auto started.

The electricians realized their mistake and contacted the Control Poom to inform Operations that they had inadvertently caused the SGT System to actuate.

The electricians were then directed to room MC-7B where they discovered a blown fuse in the breaker for SGT-ESH-2A.

The fuse was replaced and the UA" SGT System was returned to operability.

Immediate Corrective Action

After verification that no actual initiating condition existed, the RA" Train of the SGT System was returned to normal lineup and tested to verify operability.

No problems were identified.

Further Evaluation and Corrective Action Plant Procedure 1.3.42, RTrouhleshooting Plant Systems and Eouipment",

was applied to this activity.

The initial troubleshooting plan was reviewed and determined to be adequate.

However, during the performance of the plan, the troubleshooting actions needed revision but time constraints overly influenced the craftsmen due the critical implications of both SGT trains being potentially inoperable.

As a result, the craftsmen proceeded to actuate the wrong initiate push button prior to verification of the consequences of that action.

Accordingly, a Management letter will be developed regarding situations where Plant personnel may be uncertain during the performance of assigned tasks.

Plant personnel will be advised, in such situations, to evaluate the assignment prior to proceeding until they are confident of performing the task correctly.

In addition, the need to re-review appropriateness of troubleshooting actions with respect to the original plan will be emphasized.

~

The personnel involved were counseled and the event was discussed durino Electrical Shop Meetings.

~

The providing of improved communications, including the installation of telephones in rooms MC78-B and MCSB-B, will be considered.

~

Signs will he posted at the SGT-EHC local control panels to caution personnel that actuation of heater control buttons will cause starting or stopping of the SGT System.

NRC FORM 5854 (943 I

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Safet Significance This event has no safety significance in that there was no actual initiatino condition and the system operated as designed.

Similar Events

None E IIS Information Text Reference EIIS Reference Electric Heating Coil Standby Gas Treatment System (SGT)

System BH BH Component SGT-EHC-1A1 NAC FOAM SSSA IWul

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WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Box 968

~ 3000 George Washington Way

~ Richland, Washington 99352 Docket No.

50-397 April 16, 1987 Document Control Desk U.S. Nuclear Regulatory Commission Mashington, D.C.

20555

Subject:

NUCLEAR PLANT NO.

2 LICENSEE EVPIT REPORT NO.87-001

Dear Sir:

Transmitted herewith is Licensee Event Report Ho.87-001 for WP-2 Plant.

This report is submitted in response to the report requirements of 10CFR50.73 and discusses the item of reportability, corrective action taken, and action

.taken to preclude recurrence.

Very truly yours, 4/8( Pi'u'~

C.M.

Powers (M/D 927M)

WHP-2 Plant Manager CMP:

Enclosure:

Licensee Event Report No.87-001 cc:

Mr. John B. Martin, NRC - Region V

Mr.

R. T. Dodds, NRC - Site (901A)

Ms. Dottie Sherman, AHI INPO Records Center - Atlanta, GA Mr. C.

R. Bryant, BPA (M/D 399)

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