PY-CEI-NRR-0466, Forwards LERs 86-005-00 & 86-007-00

Forwards LERs 86-005-00 & 86-007-00

ML20211H101
Person / Time
Site:	Perry
Issue date:	05/21/1986
From:	Edelman M CLEVELAND ELECTRIC ILLUMINATING CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
Shared Package
ML20198E537	List: PY-CEI-NRR-0466, Forwards LERs 86-005-00 & 86-007-00
References
PY-CEI-NRR-0466, PY-CEI-NRR-466, NUDOCS 8606230110
Download: ML20211H101 (1)

Text

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. w,- . s THE CLEVELAND ELECTRIC ILLUMIN ATING COMPANY P O Box 5000 - CLEVELAND OHIO 44101 - TELEPHONE (216) 622-9800

• ILLUMINATING BLOG. - $$ PUBLIC $OUARE Serving The Best Location in the Nation MURRAY R. EDELMAN VICE PRESIDENT NUCLE A R May 21, 1986 PY-CEI/NRR-0466L U.S. Nuclear kegulatory Commission Document Control Desk Washington, D.C. 20555 Perry Nuclear Power Plant Docket No. 50-440 LERs 86-005-0 and 86-007-0

Dear Sir:

Enclosed are Licensee Event Reports 86-005-0 and 86-007-0 for the Perry Nuclear Power Plant. Licensee Event Report 86-006-0 will be transmitted via separate correspondence.

Very truly o s, Murray R. Edelman H

Vice President Nuclear Group MRE:nje

Enclosure:

LERs 86-005-0 and 86-007-0 cc: Jay Silberg, Esq.

John Stefano (2)

J. Grobe

U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL. 60137 l

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] vas in, exaccrro swarisser carri iX "o I l l asernaerru . - 4._: . - ,nm On April 21, 1936 at 2320, May 10 at 1530, May 17 at 0954 and May 19 at 0208, the Control Room Heating Ventilating and Air Conditioning (CRHVAC) system shifted into its' Emergency Recirculation (ER) mode due to high Chlorine Gas Monitor trip signals. Technicians investigating the cause of the first actuation found the M25-K200A Chlorine Gas Monitor in the tripped condition with the optics lamp out. When the monitor was opened, the optics lamp illuminated and tne monitor was reset. Technicians were unable to repeat the condition. At 2332, the CRHVAC system was returned to its normal lineup. On April 22 at 0927, troubleshooting discovered a defective filament in the optics lamp. The lamp was replaced and the monitor returned to service at 1139. Technicians investigating the second, third and fourth events found the sensing paper torn in the M25-K205B, 205A and 200A monitors respectively. In each case the. paper was replaced and the system returned to its' normal lineup.

A replacement schedule for the Chlorine Gas Monitor optic lamps has been incorporated into the Repetitive Task Program. Sensing paper is replaced on a weex1y basis. An engineering design change is being evaluated to alter the ,

logic for these monitors to prevent spurious actuations of CRHVAC. 1 Engineering evaluations are continuing to determine methods to improve I Cnlorine Gas Monitor performance, g*/,,

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OI 0I 5 010 Ol 2 0' 0 13 81 6 vuxi n . sm w anc e== muu nn On April 21, 1986 at 2320, May 10 at 1530, May 17 at 0954 and May 19 at 0208, the Control Room Heating Ventilating and Air Conditioning (CRHVAC) [VI) system shifted into its' Emergency Recirculation (ER) mode due to high Chlorine Gas Monitor [45) trip signals. At the time of the events, the plant was in operational Condition 5 (Refuel), the reactor vessel [RPV) and drywell heads were removed, the reactor cavity flooded and steam dryer storage area / reactor well gate [ GATE] removec. Reactor temperature was approximately 75 cegrees and pressure atmospheric. Train A of CRHVAC was running normally with Train B in standay.

Within minutes after the first actuation, the Control Room operator responded to the " Control Roon Emergercy Recirculation Train A (B) Initiated" annunciator [ ALM] and verified proper system operation. Both trains shifted into the ER mode. Technicians investigating the cause of the actuation found the M25-K200A Chlorine Gas Monitor in the trippec condition with the optics larp [IL] cut. When the monitor was opened by the technician, the optics lamp 111uminatec anc the monitor was reset. Technicians were unable to repeat the '

condition. At 2332, the CRHVAC system was returned to its normal 11noup.

On Apr11 22 at 092/, troublestonting was concuctec on tne M25-K200A monitor and a defective filanent in the optics lamp (manufacturer, MDA Scientific:

Model No. 10009) was discovered. The lamp was replaced and the monitor returned to service at 1139.

On May 10 at 1530, May 17 at C954 and May 19 at 0208, three more trips of a Chlorine Gas Monitor shifted the CRHVAC system into its' Emergency Recirculation mode. Operators took similar actions to those described above.

Technicians investigating the cause of the trips discovered torn sensing paper in the M25-K2053, 205A and 200A Chlorine Gas Monitors respectively. In each case, the paper was replaced and the system returned to service.

When the CRHVAC systen is in the Emergency Recirculation Mode of operation, the Control Room [NA] is isolated and maintained at atmospheric pressure by recirculating the Control Room air. The air removed from the Control Room is filtered to remove radioactive gases and particulates before returning it to the Control Room. Detection of high toxic gas levels (.4 ppm CL trip setpoint) at the air intake plenues overrides the mode switch and places both CRHVAC trains in Emergency Recirculation. The monitors will also trip if a sensing paper problen develops or the optics lamp burns out. There are four Chlorine Gas Monitors in the system. The tripping of any one of the four will place both trains of CRHVAC in Emergency Recirculation.

When activated, the CRHVAC system responded as designed. During the time the monitor was under repair, one train of the CRHVAC system was maintained in Emergency Recirculation and the other in standby. If a similar actuation were to occur at normal operating conditions (ie. 100% power), the system would not have responcea citterently. In either case, for the above statec reasons, and

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Perry Nuclear Power Plant, Unit 1 0 l5 l0 l0 l0 l4 l 4l 0 al 6 0 l0l5 0l0 verv =- . m u nae a assewnn 01 3 0F 0l3 the fact that no actual toxic gas condition existed, the event was not safety significant. There were no previous similar events identified.

A replacement schedule for the Chlorine Gas Monitor optic lamps has been incorporated into the Repetitive Task Program. Sensing paper is presently scheduled for replacement on a weekly basis. This is more frequent than the vendor reco== ended frequency. The monitors are visually inspected once per day.

An engineering design enange is being evaluated to alter the logic for the Chlorine Gas !!cnitors to prevent spurious actuations of CRHVAC.

Engineering evaluations are continuing to deternine methods to imprcve Chlorine Gas Monitor perforr.ance.

Encrgy Incustry Identification System Codes are identified in the text as

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