ML20155J645
| 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
Dear Sirs:
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
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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
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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.
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Radioactive effluent monitor RU-141 continuously monitors the condenser vacuum l
pump / gland seal exhaust for gaseous activity resulting from primary to
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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.
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Pursuant to Technical Specification 3.3.3.8 ACTION 37, the Preplanned Alternate Sampling Program (PASP) was initiated at approximately 0000 MST on
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October 6, 1988.
Ieplementat(on of the PASP continued until the radiation t
monitoring units were return d to service.
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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
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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
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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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