ML17303B078

Special Rept 2-SR-88-003:on 880324,radioactive Gaseous Effluent Monitor Inoperable for More than 72 H.Authorized Work Document Issued to Troubleshoot & Rework/Replace Components to Correct Low Flow Alarms

ML17303B078
Person / Time
Site:	Palo Verde
Issue date:	04/22/1988
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00370-JGH-J, 192-370-JGH-J, 2-SR-88-003, 2-SR-88-3, NUDOCS 8805020149
Download: ML17303B078 (6)

Text

gC CZMRATZD DISrRIBUTION MMONSYRATION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8805020149 DOC.DATE: 88/04/22 NOTARIZED: NO DOCKET I FACIL:STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 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 2-SR-88-003:on 880324,radioactive gaseous effluent monitor inoperable for more than 72 h.

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

g SIZE. ~ I NOTES:Standardized plant. 05000529 RECIPIENT COPIES RECIPIENT 'D COPIES ID CODE/NAME LTTR ENCL CODE/NAME'D5 LTTR ENCL PD5 LA 1 1 PD 1 1 LICITRA,E 1 1 DAVIS,M 1 1 INTERNAL: ACRS MICHELSON =

1 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DS P/NAS 1 1 AEOD/DSP/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/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 NRR/DLPQ/QAB 10 NRR/DREP/RAB 10 1

1 1

1 1

1 NRR/DLPQ/HFB 10 NRR/DOEA/EAB NRR/DREP/RPB 10 ll 1 1

2 1

1 2

1 1 NRR/PMAS/ILRB12 1 1 1 1 RES TELFORD,J 1 1 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

Arizona Nuclear Power Project P,O, BOX 52034 ~ PHOENIX, ARIZONA85072-2034 192-00370-JGH/TDS/JEM Apri 1 22, 1988 U. S. Nuclear Regulatory Commission 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-88-003 File: 88-020-404 Attached please find Special Report 2-SR-88-003 prepared and submitted pursuant to Technical Specification 3.3.3.8 ACTION 42b and Technical Specification 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 questio'ns, please contact T. D. Shriver, Compliance Manager at (602) 393-2521, Very tru y yours, vA,'-

J. G. Ha

~

es Vice President Nuclear Production JGH/TDS/JEM/kj Attachment cc: 0. H. DeHichele (all w/a)

E. E. Van Brunt, Jr.

J. B. Hartin T. J. Polich E. A. Licitra A. C. Gehr INPO Records Center SS05I)20149 SS0422 PDt", ADOCK 05000529 '

DCD

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-88-004 This Special Report is being submitted pursuant to Technical Specification (TS) 3.3.3.8 ACTION 42b and Technical Specificati'on 6.9.2 to report an event in which the 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 1430 HST on March 27, 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 approximately 1430 HST on March 24, 1988, Palo Verde Unit 2 was shutdown for refueling 'with the core offloaded into the Spent Fuel Pool when the Plant Ven't System Radioactive Gaseous Effluent Monitors, low range RU-143 and high range RU-144, were declared inoperable for implementation of a Plant Change (PCP) to improve the reliability of the radiation monitoring system. 'ackage 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. Since RU-143 and RU-144 work in tandem, both monitors must be declared inoperable is out of service.

if the other An authorized work document was issued to implement the PCP for RU-143 and to change its default parameters. In the event of a Loss of Power (LOP), the .

default parameter provides conservative setpoints upon restoration of. power.

The new default parameter will improve the reliability of RU-143 by assuring that the setpoints provide sufficient operating margin to minimize spurious alarms but are still conservative to ensure that the limits of TS 3. 11.2. 1 are not exceeded.

After the new software was installed, which incorporate the new default values, the proper flow rates could not be achieved. An authorized work document was issued to troubleshoot, rework, replace components to correct the problem. It was identified that there were incorrect flow values in the software. The original software was reinstalled, appropriate surveillance testing performed satisfactorily, and RU-143 and RU-144 were returned to an operable status at 0330 on April 6, 1988. The moni,tors were inoperable for approximately 12 days and 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br />.

The new revision software is planned to be ready for installation by April 26, 1988. After appropriate retesting and surveillance testing

=

it is planned to have RU-143 and RU-144 operable with the new software by April 29, 1988.