ML042960374

E-mail from D. Straka Regarding Testing Performed for Unit 1 Adv 185

ML042960374
Person / Time
Site:	Palo Verde
Issue date:	07/02/2004
From:	Straka D Arizona Public Service Co
To:	Gody A Office of Nuclear Reactor Regulation, Division of Reactor Safety IV
References
FOIA/PA-2004-0307
Download: ML042960374 (3)

Text

From: <DSTRAKA@a sc.com>

To: <atg@nrc.gov>W\r* V\4 l Date: 7/2/04 11:43AM I

Subject:

RE: Testing Performed for Unit 1 ADV 185 Tony:

Our current information on Testing Performed for Unit 1 ADV 185.

Regards, Don Straka Senior Consultant - Regulatory Affairs dstraka apsc.com phone: 623.393.5041 pager: 602.509.6240 mobile: 602.509.6240

> ---- Original Message-

> From: Berg, D. Lee (Z99751)

> Sent: Thursday, July 01, 2004 5:11 PM

> To: Straka, Donald J(Z99942)

> Cc: Smyers, Daniel W(Z89227); Fisher, Daniel A(Z99305); Landstrom,

> Carl E(Z98901); Jones, Stephen B(Z02094); Powell, Michael E(Z99700);

> McGhee, Mark A(Z65028); Fernandez, Amado T(Z02065); Muhs, Michael

> K(Z69505); Winter, Christian S(Z01491); Jones, Warren H(Z54741)

Subject:

Testing Performed for Unit 1 ADV 185

> Don,

> I was asked to update you regarding the testing performed and the

> final outcome for Unit 1 ADV 185. This valve was identified by

> operations as having erratic operation during recovery from the most

> recent trip. It appeared to operations that the valve was changing

> positions with no demand change from the control room. At least one

> time operations indicated that the valve went closed far enough to

> have indications in the control room that it was full closed. To find

> the cause for this issue three revisions to the action plan were

> issued.

> Revision 0

> ADV 185 was isolated from the steam source and stroked to the 50% open

> position looking for any indication of drifting. Instrument air

> fittings and associated parts were SNOOPed to locate leaks. The valve

> was instrumented to watch I/P signal and valve position.

> During the stroking no anomalies were discovered, also no leaks were

> detected.

> Revision 1

> Under this revision the ADV was stroked with steam using

> instrumentation monitoring the actuator and valve bonnet pressure.

> During this stroke the valve again behaved as expected. The bonnet

> pressure was found to be approximately 10 psig (lower than coming out

> of the last outage, -29 psig). The actuator pressures were similar to

> past traces performed on other ADVs. The valve was held open for about

> 3 minutes for this test. It was determined that the valve operated as

> expected.

> Revision 2

> This revision combined the previous the action plans with minor

> modifications. The control system (actuator, positioner, I/P, and

> demand signal) of the ADV was instrumented to detect any issues that

> might occur. It was also decided that the stroking would be performed

> similar to that reported from the area operator during trip recovery.

> A series of three strokes were performed, as outlined below. All

> strokes were with steam isolated.

• Provide a demand signal of 80% open. When the valve traveled to

> 20% open change the demand to 30% open. Leave the valve in this

> position for 20 minutes. After 20 minutes fully close the valve.

• The second stroke was the same as the first except the initial

> demand was 50% open.

• The third stroke had an initial demand of 50% open. When the

> valve achieved 15% open the valve was taken to 20% open. The demand

> was left at this point for 20 minutes.

> All three strokes behaved almost identically. The difference between

> demand and actual position was about 14%. This has been consistent

> from the time the valve was last calibrated during the UI RI1 outage

> through the series of five strokes described above. When that valve is

> given a demand there is a normal lag in time prior to the valve

> moving. This is due to the long tubing run between the I/P and the

> valve positioner (-110 feet). Once the demand was given the I/P

> started changing pressure as expected to allow the positioner to port

> air to the bottom of the actuator to start opening. This function

> occurred as expected. No anomalies were detected in any of the

> strokes. At no time did the ADV move from the desired position over

> any of the three 20 minute time frames.

> Based upon the response of the valve as seen in the instrumentation

> response charts ADV 185 is functioning similar to other ADVs observed

> under the same conditions. The anomalies identified by operations

> could not be recreated. Engineering cannot find any problem with the

> operation of this valve or recreate the anomalies reported by

? operations.

> In looking at equipment history I/C determined that the positioner is

> approximately 6 years old. Based upon the age of the positioner and

> not being able to recreate the described anomalies it was decided that

> the positioner would be replaced (WM# 2715990) and calibrated. No

> further actions will be performed at this time. When the positioner is

> replaced and calibration is completed operations has indicated the

> valve will be declared operable.

> If you have any questions please call me at work or home.

> Lee Berg

> Work 623-393-3676

> Pager 602-746-2498

> "To hike is to live; to hike with family is to live in heaven" CC: <DMAULDIN@apsc.com>, <DSMYERS@apsc.com>,

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