ML17300A855

Special Rept 2-SR-87-012:on 870416,Containment Bldg Atmosphere RU-1 Declared Inoperable Due to Ground Identified in Monitor.Check for Grounds Conducted But No Grounds Found. Functional Test Performed & Monitor Returned to Operation

ML17300A855
Person / Time
Site:	Palo Verde
Issue date:	05/15/1987
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00208-JGH-T, 192-208-JGH-T, 2-SR-87-012, 2-SR-87-12, NUDOCS 8705260375
Download: ML17300A855 (5)

Text

REGULATOR NFORM*TION DISTRIBUTION TEM (R IDB)

ACCESSION,NBR: 8705260375 DOC. DATE: 87/05/15 NOTARIZED: NQ DOCKET 0 FACIL: STN-50-529 Pala Verde Nuclear Station> Unit 2> Arizona Pub li 0500052'>>

AUTH, NAME, AUTHOR AFF I L I AT I ON HAYNES> J. G. Ari zona Nuclear Pouer ProJect ( formerly Ari zona Public Serv REC IP. NAME RECIPIENT AFFILIATION Document Control Branc h (Doc ument Contr o l Desk)

SUB JECT: Spec ial Rept 2-BR-87-0}2: an 8704}6> Containment Bldg Atmasphere .RU-1 declared inoperable due to ground identified. Check for grounds concucted but no grounds found.

Functional test performed 5 monitor retuTned to operation.

DISTRIBUTlON CODE: IE22D COPIES RECEIVED: LTR ENCL SIZE:

TITLE: 50. 73 Licensee Event Report (LER)> Incident Rpt> etc.

NOTES: Standardized plant. M. Davis> I'IRR: 1Cg. 05000529 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAI'lE LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 PD5 PD 1 1 LICITRA, E 1 DAVIS> M 1 1 INTERNAL: ACRS MICHELSQN. } *CRB MOELLER 2 2 AEQD/DOA 1 AEOD/DSP/RQAB 2 2 AEOD/DSP/TPAB 1 1 DEDRO 1 NRR/DEBT/ADE } 0 NRR/DEST/ADS 0 NRR/DEBT/CEB NRR/DEST/ELB 1 1 NRR/DEBT/ICSB 1 1 NRR/DEBT/MEB 1 1 NRR/DEST/I'1TB } 1 NRR/DEST/PSB 1 NRR/DEBT/RBB } 1 NRR/DEST/SGB 1 NRR/DLPG/HFB } 1 NRR/DLPG/GAB 1 NRR/DOEA/EAB 1 NRR/DREP/EPB 1 NRR/DREP/RAB } 1 I'-IRR/DREP/RPB 2 2 4PMA~LRB 1 h!RR/PMAS/PTSB 1 REQ SXL~ 02 1 1 RES DEPY GI 1 1 RQN5 FILE 01 } 1 EXTERNAL: EQR M 5 5 H ST LOBBY NARD LPDR 1 NRC PDR 1 1 NSIC HARRlS. J 1 NBIC MAYS> Q 1 1 NOTES:

TOTAL NUMBER OF COPIES REGUIRED: LT) R 45 ENCL 43

O.

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Arizona Nuclear Power Project P.o. BOX 52034 ~ PHOENIX. ARIZONA 85072-2034 192-00208-JGH/TRB/JEM May 15, 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)

Special Report 2-SR-87-012 File: 87-020-404

Dear Sirs:

Attached please find a Special Report 2-SR-87-012 prepared and submitted pursuant to Technical Specifications 3.3.3.1 and 6,9.2. This report discusses a Radiation Monitoring Unit 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) 932-5300, Ext. 6936.

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

E. E. Van Brunt, Jr.

J. B. Martin R. P. Zimmerman RE C. Sorenson E. A. Licitra A. C. Gehr INPO Records Center 87052b0375 870515 PDR ADOCK 05000529 8 PDR

0 PALO VERDE NUCLEAR GENERATING STATION Radiation Monitoring Unit Inoperable for Greater Than 72 Hours License No. NPF-51 Docket No. STN 50-529 Special Report No. 2-SR-87-012 This Special Report is being submitted pursuant to Technical Specification 3.3.3.1 ACTION 27 and Technical Specification 6.9.2 to report an event in which a process monitor, Containment Building Atmosphere RU-l, 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 2347 MST on April 19, 1987. Pursuant to Technical Specification 3.3.3.1 ACTION 27 a moveable air monitor (RU-53) was placed in line to monitor the Containment Building atmosphere.

At approximately 2347 MST on April 16, 1987, Palo Verde Unit 2 was in Mode 3 (HOT STANDBY) when RU-1 was declared inoperable due to a ground being identified in RU-1. Troubleshooting in accordance with approved work control documents identified that pin H on jack J118 was bent and shorting to the connector shell at the same time it was making contact with the female pin on plug P118 and shorting to ground.

The pin was straightened and a check for grounds was conducted. No grounds were found.

During retest of RU-1 (36ST-9SQ01), required to return the monitor to operable status, filter step alarms were being experienced approximately every 10 minutes.

The work order was amended to troubleshoot and rework/replace components to correct the filter step alarms. Filter step alarms are initiated whenever the filter paper does not increment 3 inches at predetermined time intervals. To have the tape increment 3 inches a pulse of 2 seconds, 5 volts and approximately 20 milliamps is required. A phototransistor, which operates on a light pulse, is used to stop the tape from incrementing after it has traveled the prescribed 3 inches. This phototransistor was found to be malfunctioning. An integrated circuit chip (IC2) was also found to be malfunctioning. This circuit is used for failure indication.

Both the IC2 and the phototransistor were replaced with new'omponents.

Radiation Monitoring Monthly Functional Test (36ST-9SQ01) was performed satisfactorily and RU-1 was returned to operable status at 2238 MST on April 20, 1987. The monitor was unavailable for 3 days, 23 hours2.662037e-4 days <br />0.00639 hours <br />3.80291e-5 weeks <br />8.7515e-6 months <br /> and 41 minutes.

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