05000244/LER-1985-001, :on 850116,series of Blown Fuses in Computer Resulted in Actuation of 90 Alarms on Computer Alarm Typewriter at Time I&C Technicians Removing & Restoring Foxboro Channels.Caused by Personnel Error

:on 850116,series of Blown Fuses in Computer Resulted in Actuation of 90 Alarms on Computer Alarm Typewriter at Time I&C Technicians Removing & Restoring Foxboro Channels.Caused by Personnel Error

ML20107D481
Person / Time
Site:	Ginna
Issue date:	02/15/1985
From:	Beatty E, Kober R ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
LER-85-001, LER-85-1, NUDOCS 8502220405
Download: ML20107D481 (3)

LER-1985-001, on 850116,series of Blown Fuses in Computer Resulted in Actuation of 90 Alarms on Computer Alarm Typewriter at Time I&C Technicians Removing & Restoring Foxboro Channels.Caused by Personnel Error

Event date:
Report date:
2441985001R00 - NRC Website

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AMTRACT (LiaWe to f 400 misser, d.a..soresim.esty fifisse sapegsor symmertrsse Naamp (146 On 01/16/85 a series of blown fuses in the computer resulted in actuation of about 90 alarms on the Computer Alarm Typewriter at the time that I&C technicians were removing and restoring Foxboro channels for Periodic Test procedures.

The computer technician was swapping trend and log typewriters.

A printout alerting the operator to Control Rod Banks not being updated at 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> went unnoticed due to previous alarm activity.

Subsequent printouts for Rods not updated occurred and this printout was detected when the afternoon shift operator attempted to perform the computer program check at 1634 hours0.0189 days <br />0.454 hours <br />0.0027 weeks <br />6.21737e-4 months <br />.

The Rod Banks were updated at 1703 hours0.0197 days <br />0.473 hours <br />0.00282 weeks <br />6.479915e-4 months <br />.

Procedure S-26.2 (Computer out of Service) and Technical Specification Table 4.1-1 Item #9 dictates that Control Rod Position Indicators should be initiated within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> of the alarm.

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. w an we a -ms4w nn On 01/16/85 at 0756 hours0.00875 days <br />0.21 hours <br />0.00125 weeks <br />2.87658e-4 months <br /> the " Computer Rod Deviation" alarm was satisfactorily tested.

At 0833 hours0.00964 days <br />0.231 hours <br />0.00138 weeks <br />3.169565e-4 months <br /> I&C Technicians removed Foxboro Channel 4 from scan to complete PT-5.40 (Process Instrumen-tation Reactor Protection Channel Trip Test).

At the same time the Computer Technician was swapping trend and log typewriter devices.

At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> and 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> the rod position monitor was functional.

At 1102 hours0.0128 days <br />0.306 hours <br />0.00182 weeks <br />4.19311e-4 months <br /> indication of about 90 alarms came in on the Computer Alarm Typewriter as a result of a blown fuse in the computer.

A Foxboro channel was added to scan at about the same time.

At 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> a printout (no alarm) was displayed that Control Rod Banks were not updated.

The operator failed to detect this printout and subsequent printouts on the typewriter device, alluding to the Control Rod Banks not updated, since they were not audibly alarmed.

At 1253 hours0.0145 days <br />0.348 hours <br />0.00207 weeks <br />4.767665e-4 months <br /> Foxboro Channel 1 was removed from scan and the same series of about 90 alarms reoccurred.

Another blown fuse was found to be the cause.

Further printouts followed indicating Control Rod Banks were not updated.

The afternoon shift, during the computer program check, identified the problem at 1634 hours0.0189 days <br />0.454 hours <br />0.0027 weeks <br />6.21737e-4 months <br /> and updated the computer at 1703 hours0.0197 days <br />0.473 hours <br />0.00282 weeks <br />6.479915e-4 months <br />.

According to procedure S-26.2 and Technical Specifications Table 4.1-1 Item #9 Control Rod Position Indicators should be hand logged within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> of the initial printout (or the program updated) by 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br />.

Although the event falls into the category of personnel error, it is felt that contributing factors include the unforeseen possibility of the failure of fuses concurrent with a Periodic Test well known for the excessive activity of audible alarms.

A possible corrective Action plan should include increasing the frequency of the computer check (since this action identified the problea) to every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> rather than once per shift.

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ROCHESTER GAS AND ELECTRIC CORPORATION e 89 EAST AVENUE, ROCHESTER, N.Y.14645-b001 NQ f40CER W. KOBER VCE PRESIDEN.

TE L E P6*ON E ELec1Rc a STEAM PRODUCTeON age 4 CODE M6 546 2700 February 15, 1985 U.S.

Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

Subject:

LER 85-001, Inoperable Analog Rod Position (Computer i

Rod Position Deviation Alarm) n.E.

Ginna Nuclear Power Plant, Unit No. 1 Docket No. 50-244 In accordance with 10 CFR 50.73, Licensee Event Report System, item (a)(2)(i)(B) which requests a report of, "any operation or conditions prohibited by the plant Technical Specification",

the attached Licensee Event Report LER 85-001 is hereby submitted.

' r-truly yours, Y*

R er W. Kober RWK/eeg xc U.S.

Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406

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