05000282/LER-1990-014-01, :on 900912,auto-start of One Control Room Ventilation Train Occurred

:on 900912,auto-start of One Control Room Ventilation Train Occurred

ML20062B646
Person / Time
Site:	Prairie Island
Issue date:	10/18/1990
From:	Hunstad A, Parker T NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-014-01, LER-90-14-1, NUDOCS 9010250428
Download: ML20062B646 (4)

LER-1990-014, on 900912,auto-start of One Control Room Ventilation Train Occurred

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(iv), System Actuation
2821990014R01 - NRC Website

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Telephone (612) 330 5500 October 18, 1990 10 CFR Part 50 Section 50.73.

i Director of Nuclear Reac*or Regulation-U S Nuclear Regulatory Commission Attn: Document Control Desk' Washington, DC 20555 i

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PRAIRIE ISLAND NUCLEAR CENERATINC PLANT Docket Nos. 50-282 License Nos.-DPR ' 50-306 DPR-60:

Auto-start of One Train of Control Room Special Ventilation Due to'Inadeauste Work Instructions The Licensee Event Report for this occurrence 'is attached.;

7 This event was reported via the-Emergency Notification System in.accordance with 10 CFR Part 50, Section 50.72', on September 19,1990~.

Please contact 'us if.you

'I require additional information related'to this event.

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Thomas M Parker l

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Manager L

Nuclear Support Services

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c: - Regional Administrator - Region' III,' NRC

.a NRR Project Manager, NRC

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' Senior Resident Inspector, NRC

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, n ei On September 18, 1990 Unit I was at 100% power and Unit 2 was at' cold shutdown

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for red:eling. Maintenance was planned for circuit breaker 226. The Shift l

Supervisor had approved commencement of the work after verifying'the Train A chlorine monitors operable and after reviewing the electrical load list.

He warned the Lead Operator that when circuit breaker 226 was turned off, one of the two Train B chlorine monitors would be de-energized, and he could expect a l

chlorine monitor alarm but no other actuation. When circuit breaker'226'was turned off, at 1500, the chlorine monitor alarm was received, No. 122 Control Room Cleanup Fan started automatically and outside air to the control room was isolated.

Investigation showed that the work package contained information alerting the l

operator to the fact that-one Train B chlorine detector would be de energized when circuit breaker 226 was turned off.

Further investigation revealed that, in fact, both Train B chlorine detectors are powered by circuit breaker 226 and were both de-energized when circuit breaker 226 was turned off. This information was missing from the work package because the electrical load-list, which was used to prepare the work package, was in error.

This was a non ESF actuation of ESP equipment.

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EVENT DESCRIPTION

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On September 18, 1990 Unit I was at 100% power and Unit 2 was at cold shutdown for refueling. Maintenance was planned for circuit breaker 226.-The Snift Supervisor had approved commencement of the work af ter verifying the Train A chlorine monitors (EIIS Component Identifier MON) operable and after reviewing the electrical load list.

He warned.the Lead Operator that=when circuit--

breaker 226 was turned off, one'of the two Train B chlorine monitors would be 1

de energi. zed, and he could expect a chlorine monitor alarm but no other actustion. When circuit breaker 226 was turned off, at 1500, the chlorine monitor alarm was received, No. 122 Control Room Cleanup. Fan (EIIS Component Identifier FAN) started automatically and outside air to the control room was isolated. The Lead Operator acknowledged the chlorine monitor alarm but failed to note that the control room cleanup fan had started.. When the l

operator on the following shift did his control board walkdown,-about 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> I

later, he discovered the fan running.

When no reason for its' operation was found, the fan was stopped and the isolation dampers;were reopened.

l Investigation showed that the work package contained information alerting the operator to the fact that-one Train B chlorine" detector would be'de-energized when circuit breaker 226 was turned off..Further investigation revealed that,-

in fact, both Train B chlorine detectors are powered by circuit breaker 226 j

and we + ooth de energized when circuit breaker 226 was turned off. This informat.Aon was missing from the work package because the electrical load list, which was used to prepare.the work package, was in error. :Since the circuitry initiates actuation on a 2 out of 2' logic,;de energizing'both detectors caused the actuation.

This was a non-ESF actuation of ESF equipmant.

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CAUSE OF THE EVENT

. I Cause of the event was inadequate work instructions.

The work request I

governing the work on circuit breaker 226 was saplete because there was an error in the electrical load list which was N u to prepare the work package ~.

H A modification to enhance reliability -of th: n.lorine monitoring system had '

j been completed; the modification proces;c 1 af.leda.r. assure that the data file-was updated promptly. A common power supply;fu the monitors was cons!dered 1

acceptable since.long-term corrective actior b replace'the chlorine monitors,

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each with its own power supply, is being r,1wr.ed.

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ANAINSIS OF THE EVENT The functional rest.onse of the automatic actuation of the control room cleanup

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fan was according to design. The purpose of this actuation is to protect control room personnel from chlorine leaks.

Since this' event was not triggered by' the presence of chlorine in the atmosphere, there was no threat to the operation of the plant. TneLinadvertent actuation placed the ventilation train in the safe condition. Therefore, this event-did not affect the health and safety of the public.

Since this was an unplanne'd actuation of engineered safety features equipment, this event is reportable pursuant to 10CFR50.73(a)(2)(iv).

CORRECTIVE ACTION

T The electrical load list has.been corrected.

A program is being devel_oped' to provide more-timely updating of plant data files with changes caused by modifications.

1 FAILED COMPONENT IDENTIFICATI0H None.

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PREVIOUS SIMILAR EVENTS

t Auto-starts of the control room special vent system have'been-reportedLas Unit' 1 LER's89-006, 89-009,'89 012,89-015, 89-020 and 90-001.

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