ML17303A643

Supplemental Special Rept 2-SR-86-037-01:on 861107,Tech Spec Requirement Violated.Caused by Inoperability of Containment Monitor RU-1 for More than 72 H Due to Inoperable Particulate Channel.Channel Tested & Declared Operable

ML17303A643
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
192-00262-JGH-T, 192-262-JGH-T, 2-SR-86-037-01, 2-SR-86-37-1, NUDOCS 8711020479
Download: ML17303A643 (3)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM <RIDS)

ACCESSION NBR: 8711020479 DOC. DATE: 87/10/23 NOTARIZED: NO DOCKET FACIL: BTN-50-529 Palo Uerde Nuclear Stationi Unit 2I Arizona Publi 0500052'P AUTH. NAME AUTHOR AFFILIATION HAYNESI J. G. Arizona Nuclear Poujer ProJect <formerly Arizona Public Serv RECIP. NAME RECIPIENT AFFILIATION Document Control Branch <Document Control Desk)

SUBJECT:

Forwards suppl to Special Rept 2-SR-86-037 prepared submittedI per Tech Specs 3. 3. 3. 1 5 6. 9. 2. Rept. discusses inoperability of containment bldg atmosphere radiation monitor f or more than 72 h.

DISTRIBUTION CODE: IE22D COPIES RECEIVED: LTR TITLE: 50. 73 Licensee Event Report <LER) Incident Rpti etc.

NOTES: Standardized plant.

~

g ENCL j SIZE:

,05000529 RECIPIENT COP IEB REC I P IENT COP IEB ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 1 LICITRAIE 1 l. DAVISI M 1 INTERNAL: ACRS MICHELSON 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DSP/NAS 1 1 AEOD/DSP/RQAB 2 2 AEOD/DSP/TP*B -1 1 ARM/DCTS/DAB 1 1 DEDRO 1 1 NRR/DEBT/ADS 1 0 NRR/DEBT/CEB 1 NRR/DEST/ELB 1 1 NRR/DEBT/ICSB 1 1 NRR/DEBT/MEB 1 1 NRR/DEST/MTB 1 1 NRR/DEST/PSB 1 1 NRR/DEST/RSB 1 1 NRR/DEST/SGB 1 1 NRR/DLPG/HFB 1 1 NRR/DLPG/GAB 1 1 NRR/DOEA/EAB 1 1 NRR/DREP/RAB 1 1 NRR/DREP/RPB 2 2

/SIB 1 1 NRR/PMAS/ ILRB 1 1 REG FILE 02 1 1 RES DEPY GI 1 ORD> J 1 1 RES/DE/EIB 1 RGN5 FILE 01 1 1 EXTERNAL: EGSG GROHI M 5 5 H ST LOBBY WARD 1 1 LPDR 1 NRC PDR 1 1 NSIC HARRISI J 1 NBIC MAYST G 1 1 NOTES: 1 1 TOTAL NUMBER OF COP IES REQUIRED: LTTR 47 ENCL 46

0 Arizona Nuclear Power Project P.o. BOX 52034 ~ PHOENIX, ARIZONA85072 2034 192-00262-JGH/TRB/JHT October 23, 1987 NRC Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Dear Sirs;

Subject:

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

Supplement to Special Report 2-SR-86-037 File: 87-020-404 Attached please find a Supplement to Special Report 2-SR-86-037 prepared and submitted pursuant to Technical Specifications 3.3.3.1 and 6.9.2. This report discusses the inoperability of the Containment Building Atmosphere Radiation Monitor 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,

) d. A~

J. G. Haynes Vice President Nuclear Production JGH/TRB/JHT/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 8711020479 871023 PDR ADOCK 05000529 9

PALO VERDE NUCLEAR GENERATING STATION Radiation Monitoring Unit Inoperable For Greater Than 72 Hours Special Report No. 2-SR-86-037-01 Docket No. STN 50-529 License No. NPF-51 At 2130 on November 4, 1986, Palo Verde Unit 2 was at 100 percent reactor power, when the Containment Building Atmosphere Monitor (RU-1) was declared inoperable because it was generating filter step alarms. A moveable air monitor was placed in line to comply with Technical Specification Table 3.3-6 ACTION 23. At 0818 on November 7, 1986, the gaseous channel of RU-1 was returned to service however the particulate channel remained inoperable pending completion of troubleshooting. Technical Specification 3.3.3.1 Table 3.3-6 ACTION 27 requires that a special report be submitted to the .NRC pursuant to Specification 6.9.2 within 30 days after the number of operable channels is less than required by the minimum channels operable requirement for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. In order to comply with Technical Specification Table 3.3-6 ACTION 23 and 27 the moveable air monitor was maintained in service.

RU-1 is used to detect Reactor Coolant System leakage. One of its functions is to measure particulate activity. The monitor accomplishes this by passing a sample of containment atmosphere through a filter paper. The paper is monitored for radioactive particulates that become entrapped in the fibers. The paper is moved at periodic preset intervals or steps. If a complete step of the filter paper does not occur, a filter paper step alarm will be generated.

The filter step function has historically required high maintenance to be maintained operable so a change to the step function was conducted. The filter has been changed from a step function to a fixed filter. This completely eliminates the problem with the filter step function and will prevent recurrence of this event.

At 2155 on November 10, 1986, the applicable surveillance test was performed and the particulate channel was declared operable.