ML17303A642

Special Rept 2-SR-87-002-01:on 870222,inoperability of high-range Noble Gas Activity Monitor RU-144 Exceeded 72 H Tech Spec Limit.Caused by Performance of Maint Work on Monitor.Voltage Supply Replaced & Monitor Returned to Svc

ML17303A642
Person / Time
Site:	Palo Verde
Issue date:	10/23/1987
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00264-JGH-T, 192-264-JGH-T, 2-SR-87-002-01, 2-SR-87-2-1, NUDOCS 8711020410
Download: ML17303A642 (3)

Text

REGULAT RY INFORMATION DISTRIBUTIO SYSTEM (RIDS) j

'l ACCESSION NHR '711020410 DOC. D*TE: 87/10/23 NOTARIZED: NO DOCKET FACIL: STN-50-52'P Palo Verde Nuclear Stations Unit 2i Arizona Pub li 0500052'P AUTH. NAME AUTHOR AFFILIATION HAYNES'. G. *ri zona Nuclear Poeer Prospect (formerly Arizona Public Serv RECIP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk>

SUBJECT:

Forwards suppl to Special Rept 2-SR-87-002 prepared ~c submittedi per Tech Specs 3. 3. 3. 9 5 6. 9. 2. Rept discusses radiation monitoring unit operable for more than 72 h.

DISTRIBUTION CODE: IE22D COPIES RECEIVED: LTR I ENCL TITLE: 50 73 Licensee Event Repor t (LER) i Incident Rpti J etc.SIZE:

NOTES: Standardized plant. 05000529 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 L* PD5 PD 1 L'IC ITRAr E 1 DAVISi M 1 INTERNAL: ACRS MI CHELSON 1 1 ACRS MOELLER 2 2 AEOD/DOA 1 AEOD/DSP/NAS 1 1 AEOD/DIP/ROAH 2 2 AEOD/DSP/TPAB ARM/DCTS/DAH 1 1 DEDRO 1 1 NRR/DEST/ADS 0 NRR/DEST/CEB 1 NRR/DEST/ELB 1 1 NRR/DEST/ICSB 1 1 NRR/DEST/MEB 1 1 NRR/DEST/MTB 1 1 NRR/DEST/PSH 1 1 NRR/DEST/RSB 1 NRR/DEST/SGB 1 1 NRR/DLPG/HFB 1 1 NRR/DLPG/GAH 1 NRR/DOE*/EAB NRR/DREP/RAB 1 NRR/DREP/RPB 2 2 RQ35$ R S IH 1 1 NRR/PMAS/ILRH 1 1 REG FILE 02 1 1 RES DEPY GI 1 Di J 1 1 RES/DE/EIH 1 1 RGN5 FILE 01 1 1 EXTERNAL: EG8cG GROHi M 5 5 H ST LOBBY WARD 1 1 LPDR NRC PDR 1 NSIC HARRIS' 1 NSIC NAYS> G NOTES: 1 1 TOTAL NUMBER OF COPIES REQUIRED: LTTR 47 ENCL 46

Arizona Nuclear Power Project P.O. BOX 52034 ~ PHOENIX. ARIZONA85072-2034 192-00264-JGH/TRB/TJB October 23, 1987 NRC Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station Unit 2 Docket No. STN 50-529 (License NPF-51)

Supplement to Special Report 2-SR-87-002 File: 87-020-404 Attached please find a Supplement to Special Report 2-SR-87-002 prepared and submitted pursuant to Technical Specifications 3.3.3.9 and 6.9.2. This report discusses a radiation monitoring unit which 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 />.

If you have any questions, please contact Tom Bradish, Compliance Supervisor at (602) 393-3531.

Very truly yours, J. G. Haynes Vice President Nuclear Production JGH/TRB/TJB/cld Attachment cc: 0. M. DeMichele (all w/a)

E. E. Van Brunt, Jr.

R. C. Sorenson J. R. Ball E. A. Licitra A. C. Gehr INPO Records Center 87i i0204i0 87i R ADaCK O5000329 PDR

PALO VERDE NUCLEAR GENERATING STATION Radiation Monitor Inoperable for Greater Than 72 Hours License No. NPF-51 Docket No. STN 50-529 Special Report No. 2-SR-87-002-01 This Special Report is being submitted pursuant to Technical Specification (T.S.) 3.3.3.9 ACTION 42 b and T.S. 6.9.2 to report an event in which a hi range noble gas activity monitor (RU-144) 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 operability was exceeded at approximately 0245 MST on February 22, 1987. Pursuant to T.S. 3.3.3.9 ACTION 42 a the Preplanned Alternate Sampling Program was,initiated to monitor the plant ventilation system.

At approximately 0245 MST on February 19, 1987, Palo Verde Unit 2 was in Mode 5 (COLD SHUTDOWN) for a planned Surveillance Outage when RU-144 was taken out of service for maintenance due to chattering contacts in the low voltage power supply.

Troubleshooting conducted under an authorized work document revealed that the low voltage power supply was not performing its intended function. As immediate corrective action, the low voltage power supply was replaced. The cause of the low voltage power supply failure has been evaluated and determined to be a normal component failure.

To return RU-144 to service, Quarterly Functional Test (36ST-9SQ04) was successfully performed. The monitor was declared operable at 1330 on February 24, 1987. The monitor was unavailable for 5 days, 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> and 45 minutes.