ML20155J645

Special Rept 3-SR-88-006:on 881009,condenser Evacuation Sys high-range Effluent Monitor Inoperable for Greater than 72 H.Monitor Inoperable Due to Erratic Indication Caused by Loose &/Or Dirty Detector Connection.Connection Cleaned

ML20155J645
Person / Time
Site:	Palo Verde
Issue date:	10/20/1988
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00422-JGH-T, 192-422-JGH-T, 3-SR-88-006, 3-SR-88-6, NUDOCS 8810270009
Download: ML20155J645 (2)

Text

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l Arizona Nuclear Power Project o o sox sm . non~,a mio8s swa.2w 192-00422-JGH/TDS/DAJ October 20, 1988 U. S. Nuclear Regulatory Commission NRC Document Control Desk Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 3 Docket No. STN 50-530 (License No NPF-74)

Special Report 3-SR 88 006 File: 88 020 404 Attached please find Special Report 3-SR-68 006 prepared and submitted 3 pursuant to Technical Specifications 3.3.3.8 ACTION 42(b) and 6.9.2. This report discusses an inoperable radiation monitoring unit. <

If you have any questions, please contact T. D. Shriver, Compliance Manager at (602) 393-2521.

Very truly yours, b koywa-

'J. G. Haynes Vice President Nuclear Production JGH/TDS/DAJ/kj Attachment cc: D. B. Karner (all w/a)

E. E. Van Brunt, Jr.

J. B. Martin T. J. Polich M. J. Davis A. C. Gehr INP0 Records Center 8310270000 FS1020 i PDR ADOCK Cs5000530 l S PDC 'I

E s

4 i 1 PALO VERDE NUCLEAR GENERATING STATION  !

Radiation Monitoring Unit Inoperable Fur Greater than 72 Hours License No. NPF-74  !

Docket No. STN 50 530 I Special Report No. 3-SR 88 006

~ '

This Special Report is submitted in accordance with Technical Specification 3.3.3.8 ACTION 42(b) and 6.9.2 for an event in which the Condenser Evacuation .

System high range effluent monitor (RU 142) was inoperable for greater than 72 l hours. The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> limit for inoperability was exceeded at approximately 0000 MST on October 9, 1988.

At approximately 0000 MST on October 6, 1988 RU-142 was declared inoperable as  ;

a result of the Condensr.r Evacuation System low range noble gas effluent monitor (RU-141) being declared inoperable due to erratic trend ' indication. [

Radioactive effluent monitor RU-141 continuously monitors the condenser vacuum l pump / gland seal exhaust for gaseous activity resulting from primary to [

secondary leakage. Monitors RU-141 and RU 142 work as a pair with RU 141 as '

the low range monitor and RU-142 as the high range monitor. Normal j configuration consists of RU-141 operating with RU-142 in standby. Low Range  ;

Monitor RU 141 automatically starts RU-142 and initiates filtration of the  !

condenser vacuum pump / gland seal exhaust whenever the monitor registers a i HIGH HIGH alarm condition. RU 142-is provided for tracking radioactive i effluents during postulated accident scenarios. RU-142 must be declared i inoperable when RU 141 is inoperable. [

Pursuant to Technical Specification 3.3.3.8 ACTION 37, the Preplanned Alternate Sampling Program (PASP) was initiated at approximately 0000 MST on (

October 6, 1988. Ieplementat(on of the PASP continued until the radiation t monitoring units were return d to service. l t

An approved work document was initiated to troubleshoot the cause of the  !

erratic RU-141 indication. During troubleshooting, it was identified that the  ;

cause of tha erratic indication was a loose and/or dirty detector connection. '

The detector connection was cleaned and the detector appeared to function  !

properly, following the troubleshooting, the appropriate retests were i

, performed and RU 141 was returned to service at approximately 1815 MST on [

October 10, 1988. RU-141 was inoperable approximately 114 hours0.00132 days <br />0.0317 hours <br />1.884921e-4 weeks <br />4.3377e-5 months <br /> and 15 l minutes.

• I In. order to return RU 142 to service, appropriate surveillance testing was  !

performed. During the surveillance testing, it was discovered that the check  ;

source did not respond prooerly and RU-142 was left inoperable for  ;

troubleshooting. An approved work document was initiated and following  ;

cleaning and minor adjustment of the check source.. the check source operated  :

properly, lhe appropriate retests were then performed and RU-142 was returned [

to service at approximately 1817 MST on October 12, 1988. RU-142 was j inoperable for approximately 162 hours0.00188 days <br />0.045 hours <br />2.678571e-4 weeks <br />6.1641e-5 months <br /> and 17 minutes.

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