ML20099C147

Special Rept 92-5:on 920713,radiation Monitoring Sys Channels 2R45B & 2R45C Declared Inoperable & Removed from Svc.Caused by Equipment Failure.Channel Repairs Will Be Tested Upon Completion of Mod

ML20099C147
Person / Time
Site:	Salem
Issue date:	07/23/1992
From:	Vondra C Public Service Enterprise Group
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
92-5, NUDOCS 9208030326
Download: ML20099C147 (2)

Text

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'O PSIEG Pubh Sen ue Electoc and Gas Company P O. Ibn 236 Haococks (3rdge. New Jemer 00038 Salem Generating Station July 23, 1992 U. S. Nuc1 car Regdlatory Commission '

Document Control Desk Washington, DC 20555

Dear Sir:

SALD1 GENERATING STATION LICENSE NO. DPR-75 DOCKET NO. 50-311 UNIT NO. 2 SPECIAL REPORT 92-5 This report addresses the inoperability of the R45 Radiation Monitoring System channels for greater than seven (7) days. This report has been prepared in accordance with the reporting requirements of Technical Specification 3.3.3.1.b Table 3.3-6 Action 26 pursuant to Technical Specification 6.9.2.

Sincerely yours,

/

/ / /A q/ /t  !!w C. A. Vondra General Manager -

Salem Operations MJP:pc Distribution i

.j. u"J 'I Tan r:nmnu ponnin b i 9208030326 920723 L' l PDR ADOCK 05000311 e ve, om, u e9 S PDR

SP{CIAL REPORT NUMBER 92-S l

PLANT IDENTIFICATION:

Salem Generating Station - Unit 2 Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 1DENTIFICATION OF OCCURRENegi Radiation Monitoring Channels 2R45B and 1R45C inoperable for greater than seven days due to equipment failure Event Date(s): 7/20/92 Report Date: 7/23/92 1 This report was initiated by Incident Report No.92-439. l CONDITIONS PRIOR TO OCCURRENCE 1 7/13/92: Mode 4 (Hot Standby) 7/20/92: Mode 1 (Power Operation)

DESCRIPTION OF OCCURRENCE:

On July 13, 1992 at 0230 hours0.00266 days <br />0.0639 hours <br />3.80291e-4 weeks <br />8.7515e-5 months <br />, Radiation Monitoring System (RMS) channels 2R45B and 2R45C were declared inoperable and were removed from service._ The annunciator circuit was causing alarm actuations (i.e., deenergization of the R41 RMS channels). Since the R45 RMS channels have not been returned to service within seven days,_this Special Report is required in accordance with Technical Specification 3.3.3.1.b Table 3.3-6 Action 26 which states:

"With the number of OPERABLE channels less than required by the Minimum Channels OPERABLE requirements, initiate the preplanned alternate method of monitoring the appropriate parameter (s),

within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, and: 1

1. either restore the inoperable Channel (s) to OPERABLE status within 7 days of the event, or

2. prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within 14 days following the event outlining the action taken, the cause_of the inoperability and the plans and schedule for restoring the system to OPERABLE status.

APPARENT CAUSE OF OCCURRENCE:

The root cause of this event is attri'auted to equipment failure. The channels' annunciator circuit was exhibiting sensitivity to static electric charges. This failure mechanism was reproducible.

Discussions with the vendor have indicated that, based on their experience, an integrated circuit chip or a transistor in the

-annunciator circuitry may have been failing. Upon receipt of new parts, they will be installed and the= channel tested.

l UlitT 2 SPECIAL REPORT 92-5

• j ,

'AllALYSIS OF OCCURREllCEt The 2R45B and 2R45C channels mc.11 tor the plant Vent radioactive noble

{ gas releases via representative sampling. The 2R45B monitor is a 4 medium range monitor and the 2R45C channel is a high range monitor. I They are both required in operating modes 1 - 4 (power operation to i Hot Shutdown). Their purpose is to nonitor significant releases of I i radioactive materials in compliance with the Updated Final Safety i J

Analysis Report (UFSAR) and federal regulation.

The monitors are manufactured by Eberline Instrument Co. They are energy compensated GM tubes model types Eberline SA14 and SA15, tespec,.svely. They have .in alarm function (via a common annunciator j circuit) which causes deenergization of the 2R41 channels.

CORRECTIVE ACTIOll:

{ Upon completion of channel repairs, they will be tested.

i

/

ph General Manager -

Y bl-

! Salem Operations l

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