ML17300A392
| ML17300A392 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde, 05005288  |
| Issue date: | 06/23/1986 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML17300A391 | List: |
| References | |
| 1-SR-86-071, 1-SR-86-71, ANPP-37119-EEVB, TAC-56658, NUDOCS 8608220081 | |
| Download: ML17300A392 (4) | |
Text
Arizona Nuclear Power Project P.O. BOX 52034
~
PHOENIX, ARIZONA85072-2034 June 23, 1986 ANPP-37119-EEVB/PGN/98.05 CORRECTED COPY Mr. John B. Martin, Regional Administrator Office of Inspection and Enforcement U S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1 and 2
Docket No.
STN 50-528 (License NPF-41)
STN 50-529 (License NPF-51)
Special Report 1-SR-86.-071 File:
86-020-404
Dear Mr. Martin:
Attached please find a Special Report (1-SR-86-071) prepared and submitted pursuant to Technical Specifications 3.3.3.8 and 6.9.2.
This report discusses the loose parts vibration monitoring (LPVM) system being declared inoperable.
If you have any questions, please contact me.
Very truly yours, E. E.
Van Brunt, Jr.
Executive Vice President Project Director EEVB/PGN/jle Attachment (all w/a) cc:
R.
P.
Zimmerman A. L. Hon E. A. Licitra A. C. Gehr INPO Records Center 8608220081 860814 PDR
- DOCK 05000528 8
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PALO VERDE NUCLEAR GENERATING STATION UNITS 1 AND 2 loose Parts Vibration Monitoring (LPVM) System Declared Inoperable License Nos. NPF-41, NPF-51 Docket Nos. 50-528, 50-529 Special Report 1-SR-86-071 On May 13,
- 1986, Palo Verde Unit 1 was in Mode 1
(POWER OPERATION) at 100 percent
- power, when it was discovered that the Steam Generator lA (Hot Leg) sensor (Channel
- 5) and Steam Generator 2B (Cold leg) sensor (Channel
- 8) were experiencing excessive alarms.
Additionally, the Upper Vessel B (Stud Bolts) sensor (Channel
- 2) in Unit 1 is out of service, and was reported in the results. of the Loose Parts Detection Program Report.
I On June 16,
- 1986, Palo Verde Unit 2
was in Mode 1
(POWER OPERATION) at 50 percent power when it was discovered that the Steam Generator lA (Hot Leg) sensor (Channel
- 5) was emitting spurious. alarms.
In this case, the Channel 6
sensor monitors the same Collection Region and would detect any loose part should Channel 5 fail.
Although Unit 2 has not yet rea'ched its 30th day of.
inoperability, this report addresses both Units.
The cause of the excessive alazms in. the Unit 1 sensors is believed to be attributed to improper alarm setpoint calibration for Channels 5
and 8.
Rework for all affected channels is scheduled to be done during the first refueling outage.
The cause of the spurious alarms in the Unit 2 sensors is attributed to the effect of certain plant equipment in operation.
As corrective action, a work request has been generated to check the setpoints for possible recalibration in Unit 2.
This action is scheduled for the next plant shutdown due to ALARA considerations, as the recalibration is done inside containment.
Additionally, PAT needs to be'ompleted prior to recalibration, in order to incorporate baseline data.
A special report is required and made pursuant to Palo Verde Units 1
and 2
Technical Specification 3.3.3.8 Action a.
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