ML17304B072

Special Rept 3-SR-89-003:on 890215,radioactive Effluent Monitor Inoperable for Greater than 72 H.Approved Work Document Initiated to Troubleshoot Cause of Inconsistent RU-141 Indication

ML17304B072
Person / Time
Site:	Palo Verde
Issue date:	03/15/1989
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
192-00457-JGH-T, 192-457-JGH-T, 3-SR-89-003, 3-SR-89-3, NUDOCS 8903230154
Download: ML17304B072 (6)

Text

/1 gc CEO ~TED Dl UBUTT O. l DEMON STRl O."i SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8903230154 DOC.DATE: 89/03/15 NOTARIZED: NO DOCKET Pr FACIL:STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH. NAME AUTHOR AFFILIATION HAYNES,J.G. Arizona Nuclear Power Project (formerly Arizona Public Serv RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special Rept 3-SR-89-003:on 890215,radioactive effluent monitor inoperable for greater than 72 h.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: 50.73 Licensee Event Report (LER), Incident Rpt, etc.

NOTES:Standardized plant. 05000530 ~

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 1 DAVIS,M.J. 1 1 DAVIS,M 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 ACRS WYLIE 1 1 AEOD/DOA 1 1 AEOD/DS P/TPAB 1 1 AEOD/ROAB/DSP 2 2 ARM/DCTS/DAB 1 1 DEDRO 1 1 NRR/DEST/ADE 8H 1 1 NRR/DEST/ADS 7E 1 0 NRR/DEST/CEB 8H 1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/ICSB 7 1 1 NRR/DEST/MEB 9H 1 1 NRR/DEST/MTB 9H 1 1 NRR/DEST/PSB 8D 1 1 NRR/DEST/RSB 8E 1 1 NRR/DEST/SGB 8D 1 1 NRR/DLPQ/HFB 10 1 1 NRR/DLPQ/QAB 10 1 1 NRR/DOEA/EAB 11 1 1 NRR/DREP/RAB 10 1 1 NRR/DREP/RPB 10 2 2 RISJSIB 9A 1 1 NUDOCS-ABSTRACT 1 1 RE F 02 1 1 RES/DSIR/EIB 1 1 R RAB 1 1 RGN5 FILE 01 1 1 EXTERNAL EG&G WILLIAMSI S 4 4 FORD BLDG HOY,A 1 1 H ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC MAYS,G 1 1 NSIC MURPHY,G.A 1 1 NOTES: 1 1 D

D NOTE 'ZO ALL "RIDS" RECIPZEZIS:

PLEASE HELP US 1Q REDtllCE WASTE CKÃ3ACr 'XHE DOCUMENT CONIHOL DESK i BOOM Pl-37 (EXT. 20079) K) ELXKBQTE YOUR NAME PBCH DIPHGBVTIQN LISTS FOR 'DOCEGXZS YOU DGH'T NEED)

TOTAL NUMBER OF COPIES REQUIRED: LTTR 47 ENCL 46

Arizona Nuclear Power Project P,O. BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 1.92-00457-JGH/TDS/DAJ March 15, 1989 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-89-003 file: 89-020-404 Attached please find Special Report 3-SR-89-003 prepared and submitted pursuant to Technical Specifications 3.3.3.8 ACTION 42(b) and 6.9.2. This report discusses the inoperability of a radioactive effluent monitor.

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

Very tru y yours, J. G. Haynes Vice President Nuclear Production JGH/TDS/DAJ/kj Attachment cc: D. B. Karner (all w/attachments)

E. E. Van Brunt, Jr.

J. B. Hartin T, J. Polich H. J. Davis A. C. Gehr INPO Records Center S903230i5 S903i5 F'DP ADOCK 05000530 P>'I h

PALO VERDE NUCLEAR GENERATING STATION Radiation Monitoring Unit Inoperable for Greater Than 72 Hours License No. NPF-74 Docket No. STN 50-530 Special Report No. 3-SR-89-003 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 Unit 3 Condenser Evacuation System high range effluent monitor (RU-142) was inoperable for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. 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 1710 MST on February 15, 1989. Pursuant to Technical Specification 3.3.3.8 ACTIONS 37 and 40, the Preplanned Alternate Sampling Program (PASP) was initiated at approximately 0300 MST on February 15, 1989.

At approximately 1710 MST on February 12, 1989 RU-142 was declared inoperable as a result of the Condenser Evacuation System low range effluent monitor (RU-141) being declared inoperable due to grab sample results inconsistent with monitor indication. Radioactive effluent monitor RU-141 continuously monitors the condenser vacuum 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 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 HIGH-HIGH alarm condition. RU-142 is provided for tracking radioactive effluents during postulated accident scenarios. RU-142 must be declared inoperable when RU-141 is inoperable.

An approved work document was initiated to troubleshoot the cause of the inconsistent RU-141 indication. During troubleshooting, it was identified that the inconsistent indication was caused by damage to the detector. Water vapor entrained in the sample stream condensed in the detector chamber (coldest point in the system) and caused damage to the detector.

RU-141 and RU-142 are not being returned to service until long-term corrective action can be taken. PVNGS has experienced several instances wherein moisture buildup has resulted in Condenser Evacuation System radioactive effluent monitor improper operation. In order to correct this problem, PVNGS engineering personnel, with the assistance of an independent consulting firm, are reviewing the design of the monitor. Based upon the engineering evaluation, appropriate design modifications will be prepared and implemented. 'he long-term corrective actions will be described in a supplement to Unit 3 LER 530/88-08. Following the implementation of the long-term design modifications, RU-141 and RU-142 will be returned to service. It is anticipated that the monitors will be returned to service during Unit 3's first refueling outage.