ML17303A994

Special Rept 2-SR-88-001:on 880311,radioactive Gaseous Effluent Monitors RU-144 & RU-143 Rendered Inoperable for Greater than 72 H.Caused by Reworking & Replacing of Components to Correct High Voltage Failure

ML17303A994
Person / Time
Site:	Palo Verde
Issue date:	04/05/1988
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00359-JGH-T, 2-SR-88-001, NUDOCS 8804060478
Download: ML17303A994 (12)

Text

gOOEIEMTED DISIBUTION DEMONSTRION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8804060478 DOC.DATE: 88/04/05 NOTARIZED: NO DOCKET FACIL:STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 AUTH. NAME AUTHOR AFFILIATION HAYNES,J.G.

RECIP.NAME

'rizona Nuclear Power Project (formerly Arizona Public Serv RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special Rept 2-SR-88-001:on 880311,radiation monitoring units inoperable for greater than 72 h.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR~ENCL TITLE: 50.73 Licensee Event Report (LER), Incident Rpt,

~IEE:

etc.

NOTES:Standardized plant. 05000529 8

RECIPIENT ID CODE/NAME PD5 LA LICITRA,E COPIES LTTR ENCL 1

1 1

1-RECIPIENT ID CODE/NAME PD5 PD DAVIS,M COPIES LTTR ENCL 1

1 1

1 j

A INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DSP/NAS 1 1 AEOD/DS P/ROAB 2 2 AEOD/DSP/TPAB '1 1 ARM/DCTS/DAB 1 1 DEDRO 1 1 NRR/DEST/ADS 7E 1 0 NRR/DEST/CEB 8H 1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/ICSB7A 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/RAB10A 1 1 NRR/DREP/RPB10A 2 2 SIB9A1 1 1 NRR/PMAS/ILRB12 1 1 02 1 1 RES TELFORD,J 1 1 RES/DE/EIB 1 1 RES/DRPS DIR 1 1 RGN5 FILE 01 1 1 EXTERNAL: EG&G GROH,M 4 4 FORD BLDG HOY,A 1 1 H ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC HARRIS,J 1 1 NSIC MAYS,G 1 1 NOTES 1 1 A

TOTAL NUMBER OF COPIES REQUIRED: LTTR 47 ENCL 46

l Arizona Nuclear Power Project P.O. BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 192-00359-JGH/TDS/JEN April 5, 1988 U. S. Nuclear Regulatory ComrIission NRC Document Control Desk Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 2 Docket No. STN 50-529 (License No. NPF-51)

Special Report 2-SR-88-001 Fi le: 88-020-404 Attached please find Special Report 2-SR-88-001 prepared and submitted pursuant to Technical Specification 3.3.3.8 ACTION 42d and Technical Specification 6.9.2. This report discusses radiation monitoring units 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 T. D. Shriver, Compliance t1anager at (602) 393-2521.

Very truly yours,

. G. Haynes Vice President Nuclear Production JGH/TDS/JEl'1/kj Attachment cc: 0. H. DeMichele (all w/a)

E. E. Van Brunt, Jr.

J. B. Hartin T. J. Polich E. A. Licitra A. C. Gehr INPO Records Center 8804060478 880405

'DR ADOCK 05000529 S DCD

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I i 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-88-001 This Special Report is being submitted pursuant to Technical Specification 3.3.3.8 ACTION 42b and Technical Specification 6.9.2 to report an event in which a Radioactive Gaseous Effluent Monitor (Plant Vent High Range Gaseous 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 returning to operability was exceeded at approximately 0845 MST on March ll, 1988. Pursuant to Technical Specification 3.3.3.8 ACTION 42a the Preplanned Alternate Sampling Program was initiated to monitor the Plant Vent System.

At 0845 MST on March 8, 1988, Palo Verde Unit 2 was in Mode 6 (REFUELING) when the Plant Vent System Radioactive Gaseous Effluent Montiors, low range RU-143 and high range RU-144, were declared inoperable for the performance of Surveillance Test 36ST-9SQ04 (Radiation Monitoring Quarterly Functional Test). Monitors RU-143 and RU-144 work as a pair with RU-143 being the low range monitor and RU-144 being the high range monitor. Normal configuration consists of RU-143 operating and RU-144 in standby. When RU-143 reaches a predetermined point, RU-144 starts and RU-143 goes to standby. RU-144 is provided for tracking of postulated accident releases.

During performance of the surveillance test on RU-143 a High Voltage Failure alarm was received, followed by a Detector Failure alarm. The Detector Failure alarm was due to a loss of high voltage.

An authorized work document was issued to troubleshoot and rework/replace components to correct the high voltage failure. Troubleshooting identified a faulty high voltage board. The high voltage board was replaced with a new board and the voltage adjusted to the value from the previous calibration surveillance test.

During performance of the surveillance test on RU-144 the micro computer would not initialize itself; also there was a continuous purge command. The purge command sends a signal to position solenoid valves to purge the radiation monitoring unit. In addition there was a memory check failure.

An authorized work document was issued to troubleshoot and rework/replace components to correct the problem. Troubleshooting identified a faulty Central Processing Unit (CPU) board for the micro computer. The CPU board was replaced, and the micro computer would then initialize itself. A faulty isolation board was identified as causing the continuous purge command. The isolation board isolates the detector skid from the micro computer thereby preventing faults at the skid from damaging the computer.

Special Report 2-88-001 Page 2 A new isolation board was inserted to correct the problem. The memory check failure was caused by weak batteries and a new battery pack was inserted.

After satisfactory completion of appropriate surveil'lance tests RU-143 and RU-144 were declared operable at 1735 HST on llarch 23, 1988. The monitors were out of service for approximately 15 days and 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br />.

f 14

Di'stri74.txt Distribution Sheet Priority: Normal From: Esperanza Lomosbog Action Recipients: Copies:

ternal Recipien LE CENTER 01 Not Found External Recipients:

NRC PDR Not Found NOAC Not Found Total Copies:

Item: ADAMS Document Library: ML ADAMS"HQNTAD01 ID: 993500386 l

Subject:

Transmittal forwarding 990904 meeting handout materials regarding lice nsee plans to request NRC approval of power uprate for Palo Verde 2 th at will follow the planned steam generator replacement for unit for im mediate placement in public domain.

-Body:

PDR ADOCK 05000529 P Docket: 05000529, Notes: Standardiz'ed plant.

Page 1

I rp,-~

NRC FORM 658 Ij.s. NUCLEAR REGULATORY COMMISSION

[9-1 $99)

TRANSMITTALOF MEETING HANDOUT MATERIALS FOR IMMEDIATEPLACEMENT IN THE PUBLIC DOMAIN P

I This formis to be filled out (typed or hand-printed) by the person who announced the meeting (i.e., the person who issued the meeting notice). The completed form, and the attached copy of meeting handout materials, willbe sent to the Document Control Desk on the same day of the meeting; under no circumstances willthis be done later than the working day after the meeting.

Do notinclude proprietary materials.

DATE OF MEETING The attached document(s), which was/were handed out in this meeting, is/are to be placed 12/15/1999 in the public domain as soon as possible. The minutes of the meeting will be issued in the near future. Following are administrative details regarding this meeting:

Docket Number(s) 50-529 Plant/Facility Name Palo Verde Nuclear Generating Station, Unit 2 TAC Number(s) (if available) N/A Reference Meeting Notice September 4, 1999 meeting notice Purpose of Meeting (copy from meeting notice) To discuss the licensee's plans to request NRC approval of a power uprate for Palo Verde 2 that willfollow the planned steam generator replacement for this unit.

N WH I u M IN N I I L Mel Fields Project Manager OFFICE NRR DIVISION DRPM BRANCH PDIV-2 Distribution of this form and attachments:

Docket File/Central File PUBLIC NRO FORM 658 (9-1 999) PRINTED ON RECYCLED PAPER This Iorm was designed using InForms gg~sucos 8 Q

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