ML18094A345

Special Rept 89-2:on 890403,radiation Monitoring Channels 2R45B & 2R45C Inoperable for Greater than 7 Days.Caused by Intermitten Spiking & Equipment Failure in Associated Reactor Monitoring Sys Channels.Channels Calibr

ML18094A345
Person / Time
Site:	Salem
Issue date:	04/10/1989
From:	Miller L Public Service Enterprise Group
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
89-2, NUDOCS 8904240070
Download: ML18094A345 (3)

Text

I

• 1 PS~G *

• Public Service Electr"ic and Gas Company P.O. Box E Ha11cocks B1*idge, New Jer*sev 08038 Salem Generating Station April 10, 1989 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

Dear Sir:

SALEM GENERATING STATION LICENSE NO. DPR-75 DOCKET NO. 50-311 UNIT NO . . 2 SPECIAL REPORT 89-2 This Special Report addresses the inoperability of the medium and high range Plant Vent Radiation Monitors (2R45B & 2R45C) which were not restored to operable status within seven (7) days. This report satisfies the reporting requirements of Technical Specification 3.3.3.1.b Table 3.3-6 Action 26 pursuant to Technical Specification 6.9.2. It is being submitted within 14 days of the event as p~r the Action Statement.

L. K. Miller General Manager -

Salem Operations MJP:pc Distribution 8904240070 PDR ADOCK 0 aiga5g11 PNU s

SPECIAL REPORT NUMBER--2 PLANT IDENTIFICATION:

Salem Generating St~tion - Unit 2 Public Service Electric & Gas Company Hanc9ck's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Radiation Monitoring Channels 2R45B and 2R45C inoperable for greater than seven days due to equipment concern Event Date{s): 4/03/89 Report Date: 4/10/89 This report was initiated by Incident R~poit No.89-173.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 Reactor Power 100% Unit Load 1140 MWt DESCRIPTION OF OCCURRENCE:

On March 27, 1989 at 0420 hours0.00486 days <br />0.117 hours <br />6.944444e-4 weeks <br />1.5981e-4 months <br />, R~diation Moriitor{ng System ~RMS) channe;J..s 2R45B and 2R45C were declared. inoperable and were blocked.

Since they were not returned to service until April 3, 1989 at 2345 hours0.0271 days <br />0.651 hours <br />0.00388 weeks <br />8.922725e-4 months <br /> (greater than seven days}, this Special Report is required in accordance with Technical Specification 3.3 .. 3.1.b Table 3.3-6 Action 26.

The 2R45 RMS channels were declared inoperable due to intermittent spiking.

Techhical Specification 3.3.3~1.b Table 3.3-6 Action 26 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. 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 Specificati~n 6.9.2 within 14 days following the event outlining the action taken, the cause of the inoperability and the plans and *6hedule for restoring the system to OPERABLE status.

APPARENT CAUSE OF OCCURRENCE:

The root cause of this event has been attributed to an equipment failure of the associated RMS channels.

ANALYSIS OF OCCURRENCE:

The 2R45B and 2R45C channels monitor the Plant Vent radioactive noble gas releases via representative sarnplihg. The 2R45B monitor is a

UNIT 2 SPECIAL REPORT~-2 ANALYSIS OF OCCURRENCE: (cont'd) medium range monitor and the 2R45C channel -is a high range monitor.

They are both required in operating modes 1 - 4 (power operation to Hot Shutdown). Their purpose is to monitor significant releases. of radioactive materials in compliance with the Updated Final Saf~ty 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, respectively .

. The intermittent spiking of the 2R45B monitor had resulted in deenergizinq the 2R41 (Low Range Plant Vent Monitors) sample pump.

The channel-is interlocked with the pump to cause this to occur.

When the 2R41 pump low flow alarm* was received, the pump was re-started.

CORRECTIVE ACTION:

The 2R45 channels were calibrated and functionally tested

-successfully.

A design modification to supply regulated voltage to the RMS channels is being developed. This design will incorporate -the use of either an uninterruptable power supply (UPS) or* a regulated transformer.

General Manager -

Salem Operations MJP:pc SORC Mtg.89-029