ML20003C775
| ML20003C775 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 03/03/1981 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Rich Smith VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 8103180265 | |
| Download: ML20003C775 (5) | |
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UNITED STATES 3
o NUCLEAR REGULATORY COMMISSION E
WASHINGTON, D. C. 20555 o%ncT/
March 3,1981 Docket No. 50-271 f
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Mr. Robert L. Smith E
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[1 Licensing Engineer Vermont Yankee Nuclear
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Power Corporation 4;>
1671 Worcester Road
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Dear Mr. Smith:
We have. identified the enclosed additional infarmation as being required so that we can complete our evaluation of the infonnation you provided us by letter dated Decerrber 27, 1979.
Please provide us this information within 45 days of receipt of this letter..
Sincerely,
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D Thomas ppolito, Chief Operating Reactors Branch #2 Division of Licensing
Enclosure:
Request for Additional Information
- cc w/ enclosure See next page e
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0103I80A685
! March 3 19@l' y
0 Mr. Robert L. Smith l
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Mr. W. F. Conway John R. Stanton, Director
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Vice President and Manager Radiation Control Agency l
of Operations Hazen Drive Vemont Yankee Nuclear Power Concord, New Hamoshire 03301 Corporation P. O. Box 157 John W. Stevens Ve'rnon, Vermont 05602 Conservation Society of Southern Vermont Mr. Louis-H. Heider, V.P.
P. O. Box 256 Vemont Yankee Nuclear Power Townshend, Vermont 05353 to Raynond N. McCandles's 25 e g Drive pa$ona 5Rado g cal H1th Westboro, Massachusetts 01581 Oc 1
Administration Building John A. Ritscher, Escuire Montpelier, Vewnont 05602 l
Ropes & Gray 226 Franklin Street New Encland Coalition on Nuclear l
Boston, Massachusetts 02110 Pollution l
Hill and Dale Farm Laurie Burt West Hill - Faraway Road Assistar.t Atte ney General Putney, Vemont 05346 Environmental Protection Divisicn Attorney General's Office Public Service Board One Ashburton Place,19th Floor State of Vemont Boston, Massachusetts 02108 120 State Street Montpelier, Vernent 05602 Ronald J. Wilson 810 lath Street, N. W.
W. P. Murohy, Plant Suoerintendent Suite 802 Vemont Yankee Nuclear Power Washington, D. C.
20005 Corporation P. O. Box 157 I
Honorable M. Jerome Diatrond Vernon, Yemont 05354 Attorney General State of Yement David White
'109 State Street Co-Director
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Pavilion Office Building Vemont Public Interest Montpelier, Vemont 05602 Reserach Group Inc.
43 State Street Mr. J. E. Griffin, President Montpeiler, Yement 05602 Vennont Yankee Nucler Power Corocration Vermont Yankee Decommissioning 77 Grove Street Alliance Rutland, Vennont 05701 5 State Street Box 1117 Vemont Yankee Decomissioning Montpelier, Vemint M602 Alliance 127 Main Street Brooks Memorial Library Brattlebo'ro, Vemont 05301 224 Main Street Brattleboro, Vemont 05301 w
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,- March 3,1981 Mr. Robert L. Smith cc:
Resident Inspect r 2/o U. 5. NRC P. O. Box 176 Vernon Vermont 05453 O
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o REQUE5T FOR ADDITf 0NAL TUFORpATION VERMONT YANKEE NUCL. EAR POWER yTATION CONTAINMENT PURGING DURING NORMAL PLANT OPERATION MECHANICAL OPERABILITY DE90NSTRATION 1.
a.
Was the Allis Chalmer's ( AC) test report A-C, VER-0209 used as the basis for predicting valve loading results from the DSA-LOCA pos-tulated?
b.
What test numbers in the AC report apply to these valves?
c.
Was the peak containment pressure resulting from the DBA-LOCA used for the " Initial Upstream Pressure" (as used in the AC report)? If not, provide the rationale used to allow use of a lower " Initial Up-stream Pressure." Discuss instrument lag times used, actual valve closure times or Tech. Spec. allowable times as they apply.
2.
What were idantified as the critical parts in these valves (shaft, disc to shaft pins, other)? What were the stresses calculated? Do they include simultaneous seismic loading? What are the design allowable stresses? What code or standards are the valves designed to?
3.
Do the operators have maximum torque rating (s) as established by the manufacturer? How does it compare to the naximum torque developed dur-ing the accident postulated? Does combined loading of spring and dynamic torque affect any parts cr the operator to the extent that they become the limiting factcr' 4.
Is there sufficient torque margin available from the operator to over-come the tor..:: developed that tend to oppose valve clonure as the s
valve strokes from its initial open position to the fully seated posi-tion. What is the minimum margin available and at what disc angle does this minimum exist?
5.
For tho e valve assemblies (with air operators) inside containment, has the containment pressure rise (backpressure) been considered as to its affect on torque margins available (to close and seat the valve) from the actuator? During the closure period, air must ba vented from the actuators opening side through the solenoid valve into this backpres-sure. Discuss the installed actuator bleed configuration and ptovide basis for not considering this backpressure affect a problem on torque margin. Valve assembly using 4 way solenoid valve should especially be revi ewed.
6.
Describe the extent to which the valve assembly (valve and operator) is seismically qualified?
7.
Describe the extent to which the cilot solenoid valves are seismically qualified and environmentally qualified for long term exposure to the normal plant environment.
If the ourge valves are to be operative post-LOCA describe the extent to which the solenoid valves are environ-mentally qualified for the LOCA environment. Do the elastomeric parts, solenoids, etc. have a qualified design life where periodic replacement of parts is required?
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8.
Describe the extent to which the operators are seismically qualificd and environmentally qualified for long term exposure to the normal plant en-vironment? If the purge <alves are to be operative post-LOCA, describe the extent to which the operators are environmentally qualified for the LOCA environment. Do the elastomeric parts in the operator have a qual-ified design life where periodic replacement is required?
9.
Do the elastomeric parts-in the valve body have a qualified design life?-
Are they requir'ed to be replaced periodically?
- 10. Have the manufacturer's recommended preventive maintenance instructions '
(lubrication, etc.) been reviewed for the valve, operator and solenoids
-and are they being followed?
- 11. Where* air operated valve assemblies use accumulators as the fail-safe feature, describe the accumulator air system configuration and its oper-
. ation. Provide necessary. infonnation to show the adequacy of the ac-cumulator to stroke the valve i.e., sizing and operation starting from lower limits of initial air pressure charge. Discuss active electrical components in the c;cumulator system, and the basis used to determine
.aeir qualification for the environnental conditions experienced.
Is this system seismically designed?
- 12. Provide an assessment of the structural capability of any ducting or piping in the purge system which is upstream or downstream of the valves and is exposed to the flow condition associated with the LOCA and the seismic event. The staff is particularly interested in the effects that loose debris from the pipe or duct system may have on the closure capability of these valves.
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