ML17303A705

Suppl 2 to Special Rept 2-SR-86-008:on 860326,condenser Evacuation Sys high-range Radiation Monitor Declared Inoperable & Exceeded Tech Spec Limit.Caused by Moisture in in Process/Sample Flow Media Causing Flow Filter Clogging

ML17303A705
Person / Time
Site:	Palo Verde
Issue date:	11/24/1987
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00318-JGH-T, 192-318-JGH-T, 2-SR-86-008, 2-SR-86-8, NUDOCS 8711300175
Download: ML17303A705 (4)

Text

REGULA Y INFORMATION DISTRIBUTI SYSTEM (RIDS)

ACCESSION NBR: 8711300175 DOC. DATE: 87/11/24 NOTARIZED: NO DOCKET ¹ FACIL: STN-50-529 Palo Verde Nuclear Stations Unit 2I Arizona Publi 05000529 AUTH. NAME AUTHOR AFFILIATION HAYNES'. Q. Arizona Nuclear Power Pro Ject (formerly Arizona Public Serv RECIP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special Rept 2-SR-86-008: on 860326'ondenser evacuation sys lou range radiation monitor declared inoperable 5 on exceeded. Caused by moisture trapped in 870329'2 h action statement process/sample floe media. Moisture trap installed.

DISTRIBUTION CODE; IE22D COPIES RECEIVED LTR I ENCL J SIZE; TITLE: 50. 73 Licensee Event Report (LER)i Incident Rpt. etc.

NOTES: Standardized plant. 05000529 RECIPIENT COPIES RECIPIENT COP IES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 1 LIC ITRA> E 1 1 DAVISI M 1 1 INTERNAL: ACRS MICHELSON 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DSP/NAS 1 1 AEOD/DSP/RO*B 2 2 AEOD/DSP/TPAB 1 1 ARM/DCTS/DAB 1 1 DEDRO 1 1 NRR/DEST/ADS 1 0 NRR/DEST/CEB 1 1 NRR/DEST/ELB 1 1 NRR/DEST/ ICSB 1 1 NRR/DEST/MEB 1 1 NRR/DEST/MTB 1 1 NRR/DEBT/PSB 1 1 NRR/DEST/RSB 1 1 NRR/DEST/SGB 1 NRR/DLPG/HFB 1 1 NRR/DLPG/GAB 1 1 NRR/DOEA/E*B 1 NRR/DREP/RAB 1 1 NRR/DREP/RPB n 2 R SIB 1 1 NRR/PMAS/ ILRB 1 REQ FILE 02 1 1 RES DEPY GI 1 1 FORD> J 1 1 RES/DE/EIB 1 RQN5 F ILE 01 1 EXTERNAL: EGSG GROHI M 5 5 H ST LOBBY WARD 1 LPDR 1 NRC PDR 1 1 NSIC HARRISI J 1 1 NSIC MAYSI Q 1 1 NOTES: 1 1 TOTAL NUMBER OF COPIES REQUIRED: LTTR 47 ENCL 46

Arizona Nuclear Power Project P.O. BOX 52034 ~ PHOENIX, ARIZONA85072-2034 192-00318-JGH/TRB/JEH November 24, 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-86-008 Fi le:= 87-020-404 Attached please find Supplement 2 to Special Report 2-SR-86-008 prepared and submitted pursuant to Technical Specification 3.3.3.8 and 6.9.2. This report is submitted to provide updated information from the previous supplement.

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

Very truly yours,

, C-.

J. G. Haynes Vice President Nuclear Production JGH/TRB/kj Attachment cc: 0. N. DeHichele (all w/a)

E. E. Van Brunt, Jr.

R. C. Sorenson J. R. Ball E. A. Licitra A. C. Gehr INPO Records Center 871i300275 87ii24 PDR ADOCK 05000529

/gC S PDR ICl

PALO VERDE NUCLEAR GENERATING STATION Supplement to Special Report No. 2-SR-86-008 I

RADIATION MONITORING UNIT NOT RESTORED TO OPERABLE STATUS WITHIN 72 HOURS Docket No. STN,50-529 License No. NPF-51 This supplement to Special Report No. 2-SR-86-008 provides updated information on the event of March, 1986, in which the Condenser Evacuation System High Range Radiation Monitor, RU-142 was declared inoperable and subsequently exceeded ACTION Statement 42 of Palo Verde Unit 2 Technical Specification 3.3.3.8, Table 3.3-13.

I Monitors RU-141 and RU-142 monitor the Condenser Evacuation System for gaseous activity resulting from primary to secondary system leakage. These monitors work as a pair with RU-141 being the low range monitor and RU-142 being the high range monitor. Normal configuration consists of RU-141 operating and RU-142 in standby. When RU-141 reaches it's maximum range, RU-14? starts and RU-141 goes to standby.

The Condenser Evacuation System Low Range Radiation Monitor RU-141, was declared inoperable at 0831 MST on March 26, 1986, due to low flow alarms being received.

Since RU-141 and RU-142 work in tandem, RU-142 was also declared inoperable. A work authorizing document was issued to troubleshoot the cause of th'e alarms and to repair monitor RU-141 as appropriate. At 0831 on March 29, 1986, the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> ACTION Statement for operability for monitor RU-142 was exceeded.

The initiation of the Preplanned Alternate Sampling Program (PASP) of Technical Specification 6.16 may be used as a compensatory measure during the inoperability of RU-142, to monitor the appropriate parameter(s) when necessary.

However, since no source term is present at this time, implementation of, the PASP was not required.

The root cause of this event was determined to be moisture trapped in the process/sample flow media, causing sample flow filter clogging from the condenser air removal system. To address the root cause,.a moisture trap was inst'alled in the monitor sample line under an authorized work document. The radiation monitor was declared OPERABLE on April 16, 1986.