ML20245D388
| ML20245D388 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 04/21/1989 |
| From: | Lobel R Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| REF-PT21-89 NUDOCS 8904280283 | |
| Download: ML20245D388 (20) | |
Text
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pa nog fg UNITED STATES
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WASHINGTON, D. C. 20555
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APR 211999 I
VENDOR:
Control Components Incorporated
SUBJECT:
SUMMARY
OF MEETING HELD APRIL 13, 1989, TO DISCUSS OPERATION OF ATMOSPHERIC DUMP VALVES On April 13, 1989, thestaffmetwithControlComponentsIncorporated(CCI) at NRC headquarters One White Flint North, Rockville, Maryland.
CCI had requested this meeting to provide the NRC staff with information on the design and operation of certain models of CCI atmospheric dump valves. lists the meeting attendees. A telephone bridge was provided for NRC regional personnel from Regions II, IV and V, resident inspectors and affected licensees. The meeting agenda is provided in Enclosure 2.
A representative of CCI, Mr. Herb Miller, Vice President, Engineering, discussed valve operation, design, and failure analysis. Enclosure 3 contains the slides used during the meeting for valve description and worst case model assumptions.
The main discussion centered on problems arising from failure of the atmospheric dump valves at Palo Verde Unit 3 to open from either the control room or remote shutdown panel on March 3, 1989. Mr. Miller stated that CCI has advised their customers that modifications to their valves could be made to increase the reliability to open by eliminating excessive bonnet pressure. This would be done by use of a more leak-resistant piston ring and a larger flow area to relieve steam above the piston more rapidly. Calculations done by CCI show that, even for worse case analyses, sufficient actuator force should exist to allow the valve to open when these modifications are made. Mr. Miller displayed a modified piston ring which CCI believes reduces leakage.
At the end of the presentation, Mr. Miller opened the floor to questions.
The meeting was for information only and therefore there were no conclusions or action items identified as a result of this meeting.
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j Richard Lobel', Section Chief PWR Section Events Assessment Branch Office of Nuclear Reactor Regulation
Enclosures:
As stated
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8904230283 890421 PDR ORG NRRB PDC
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Control Components Incorporated Distribution WDLanning EAB r/f.
DOEA r/f CHBerlinger, NRR EJButcher, NRR JThompson r/f-RLobel, NRR-wCentriltEiles JRBall, NRR KNJabbour NRR MWegner, NRR
'WHaass, NRR ASistos, Southern California Edison CEWilliams, Southern California Edison SMMatthews, NRR MJDavis, NRR MRJohnson,'NRR-TLChan, NRR LBMarsh..NRR TSullivan, NRR JBailey, Arizona.Public Service /ANPP CRogers, Arizona Public Service /ANPP JGPartlow, NRR DEHickman, NRR GWKnighton, NRR DLWigginton, NRR WACross, NRR HKShaw, NRR PDR OFC :EAB:NRR
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DATE : V /nV89
- 4/A//89 0FFICIAL RECORD COPY
Attendance List for the Control Components Incorporated NRC Meeting on April 13, 1989 Name Organization Richard Lobel NRR/NRC John Thompson NRR/NRC Jay R. Ball NRR/DRIS K. N. Jabbour NRR/PDII-3' Mary Wegner AEOD Walter Haass NRR/V1B Angel Sistos Southern California Edison Clay E. Williams Southern California Edison Steven M. Matthews NRR/VIB Michael J. Davis NRR/PDV Michael R. Jonnson OEDO Terence L. Chan NER/PDV Tim Collins NRR/SRXB L. B. Marsh NRR/EMEB Ted Sullivan NRR/EMEB Jack Bailey Arizona Public Service /ANPP Carter Rogers Arizona Public Service /ANPP J. G. Partlow NRC/NRR D. E. Hickman NRR/PDV G. W. Knighton NRR/PDV D. L. Wigginton NRP/PDIV William A. Cross LP&L/STS Horace K. Shaw EMEB
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Differences Betv*en Plants Valve. orientation-Songs & Catawba inverted with drains.
Qualification Palo Verde has seismic, radiation, elevated environment and age conditioning.
Others have seismic-Actuator
- Control Schematic Palo Verde has two Solenoids in series.
Other have'poosters Tihe To Open Palo Verde 80 Sec.
Catawba 20 Sec.
Waterford 11 Sec.
Songs 10 Sec.
Palo Verde and Songs idle until called Plant Operation upon to operate.
Waterford used for 4 to 5 start-up cycles per year.
Duke operated quarterly after isolation.
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EXPERIENCE 1 valve slow to open
- SONGS 1 Anomaly.
Piston ring upside down
- CATAWBA 2 Anomalies ~
Failed at 1130/1140 psi OK at 1075 psi Piston ring worn
- ST. LUCIE 1 Anomaly Open torque switch tripping, mid stroke when torque bypass switch dropped out
- PALO VERDE Unit One.
Only one confirmed failure to open Unit Three Thres vaiveswere ~ questioned -
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