ML20140G786

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Forwards Proposed Meeting Summary & Working Copy of Minutes for ACRS Palo Verde Nuclear Station Subcommittee 850426 Meeting in Wintersberg,Az
ML20140G786
Person / Time
Site: Palo Verde, 05000000
Issue date: 05/06/1985
From: Wang A
Advisory Committee on Reactor Safeguards
To: Ebersole J
Advisory Committee on Reactor Safeguards
Shared Package
ML20140B723 List:
References
FOIA-86-45 NUDOCS 8604030585
Download: ML20140G786 (4)
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'o UNITED STATES f ..*P. i '

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r NUCLE ~., REGULATORY COMMISSION ADVISORY COMMITTEE ON REACTOR SAFEGUARDS j f W ASHINGTON. D. C. 20556 5 0 g May 6, 1985

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t MEMORANDUM FOR:

J. Ebersole, Chairman Palo Verde Nuclear Station Unit 1 Subcomittee s

FROM: A. Wang, Staff Engineer w N O4wy C

SUBJECT:

PROPOSED MEETING

SUMMARY

AND WORKING COPY OF THE MINUTES FOR THE PALO VERDE NUCLEAR STATION SUBCOMMI MEETING, APRIL 26, 1985, WINTERSBURG, ARIZONA A proposed combined sumary and working copy of the minutes of the subject meeting is attached for your review. Copies are being distributed to the other ACRSCorrectionsMembersand andadditions Subcomitteewill be Consultants for their information and comment.

included in the minutes of the meeting. ,

Attachments: As stated i cc: ACRS Members M. Libarkin G. Quittschreiber l'

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ATTACHMENT 4 l

1 13 8604030585 860311 PDR FDIA SCOTT 86--45 PDR

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WORKING COPY DATE ISSUED: 3/22/85 PROPOSED MEETING

SUMMARY

/ MINUTES FOR i

THE ACRS PALO VERDE NUCLEAR STATION SUBCOMMITTEE

' MEETING, APRIL 26, 1985 - WINTERSBURG, ARIZONA i

Principal Attendees:

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ACRS NRC J. Ebersole, Chairman R. Zimerman H. Lewis, Member G. Reed, Member A. Wang, Staff, DF0 Arizona Public Service E. VanBrunt O. Zeringue A. Roger R. Adney Introduction 1

J. Ebersole stated he would like to get an overview of the plant status.

This overview should include discussions of the power escalation

< program, unexpected findings during hot functional testing, and valve and pump reliability with particular attention to the Chemical Volume andControlSystem(CVCS)andtheAuxiliaryFeedwaterSystem(AFS). He also asked the Arizona Public Service (APS) to discuss their emergency procedures and walk through what APS might consider one of their more critical accident situations. He asked that APS include in this discussion how the operator determines the reliability in his instruments, how back-up indications based on indirect instrument indications are used, and the difference between " safety related" and "important to safety" systems. Both J. Ebersole and G. Reed stated Palo Verde is a no " frills" plant, as APS has installed the minimum required safety systems. Because of this, the plant has less flexibility in 7

responding to an accident and J. Ebersole wanted to assure himself that ,

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. APS has the operator capability comensurate with this minimum l

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Palo Verde Minutes April 26,1985 configuration to deal with potential problems. G. Reed stated he would like a discussion of the quality and selection of operators.

Power Ascension Program O. Zeringue provided the Subcomittee a status of the plant with regards

- to its power ascension. He noted the hot functional test in Mode 4 are complete and they will soon enter into Mode 3. There are seven planned trip tests. He stated their ascension program was compared with San Oncfre's and Arkansas'.

Significant Unexpected Findings During Preoperational Testing A. Rogers stated the principal unexpected findings have been the damage to the primary coolant system and the HPSI valve failures. J. Ebersole asked A. Rogers to limit his discussion to those items which there was a safety concern. A. Rogers stated the primary system damage was only a concern from an operational standpoint. The HPSI valves were a safety problem. The resolution was to reverse the valve seat orientation, add flow balancing orifices downstream, change torque switch and contact springs- He noted they had problems opening and closing the valve.

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Ebersole asked if APS had tested their isolation valves to open or close against full flow. He also inquired had analysis been done to assure checks are qualified to take the full dynamic load of a line break. APS stated most of their isolation tests are at full flow. The checks are leak tested periodically to verify their condition.

Emergency Operating Procedures R. Adney provided a discussion on Palo Verde's symptom oriented emergency procedures. J. Ebersole requested R. Adney to walk through his procedures assuming a steam generator tube break. He asked what does the' operator do when he get conflicting readings. R. Adney stated they have diverss indications and there procedures are such that two operators are following two separate flow charts to evaluate the accident. At the same time the supervisor is following his own flow r

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April 26,1985 l

. . Palo Verde Minutes t

4 chart to determine the most probable cause of the accident. H. Lewis reiterated what does the operator do when'he gets conflicting readings. ,

He noted at TMI-2 the instruments were right but the operators chose not l

' to believe them because they could not believe that they were having a I

serious accident. He inquired if during their simulations training spurious readings are inputed. R. Adney said yes and noted the j

i procedures require the operator to look at numerous indications to f

verify that the precess is working as expected.

J. Ebersole inquired about what APS considered safety related versus important to safety. R. Adney stated they are different from other l

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plants because all their safety systems including the UHS are on standby. G. Reed stated has APS looked at the availability of stand-by systems with the isolation valves closed (APS configuration) versus the leaving the isolation valves open. J. Ebersole asked since all systems l are on standby do the operators know what the critical times for cooling water is to varicus equipment or does APS run the component to f

destruction, for example the diesels? APS stated the critical time factors are known. In the case of the diesels, APS would shutdown the diesels and lose all AC power rather than lose all diesel.s. APS j believes they can always repair the diesels.

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l NOTE: Additional meeting details can be cbtained frcm a transcript of '

this meeting available in the NRC Public Document Room,1717 H Street, N.W., Washington, D.C. or can be purchased from ACE-Federal Reporters, 444 North Capitol Street, Washington, D.C. l i

20001.(202)347-3700. j

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