ML19353A100
| ML19353A100 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 12/10/1980 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Morisi A BOSTON EDISON CO. |
| References | |
| NUDOCS 8101070162 | |
| Download: ML19353A100 (4) | |
Text
'
?
a i
O n[CMR
/
f(pouwq[%,
UNITED STATES 5
g NUCLEAR REGULATORY COMMISSION l _c7 Q.
y ps>(
gg j
wassmorow, o.c.nosss L'g;H
.];
jg December 10, 1980 f
r A3
\\' ~- @,/
g g
a N
Docket No. 50-293 Mr. A. Victor Morisi Boston Edison Company M/C NUCLEAR 800 Boylston Street Boston, Massachusetts 02199
Dear Mr. Morisi:
In order to complete our review of ycur submittal (BECO 80-95, 27 May 1980) regarding containment vent and purge valve operability, we require additional information.
It should be noted that similar questions were telecopied to you last January.
Your response is requested within 60 days of the receipt of this letter.
Thank you for your cooperation in this regard.
Sincerely, Titomas
.' Ippolito, Chief Operating Reactors Branch #2 Division of Licensing
Enclosure:
Request for Additional l
Infomation cc w/ encl:
See next page s10 3070 \\ UL
l Mr. A. Victor Morisi Boston Edison Company December 10, 1980 cc:
Mr. Richard D. Machon Pilgrim Station Manager Boston Edison Company RFD #1, Rocky Hill Road Plymouth, Massachusetts 02360 Henry Herrmann, Esquire Massachusetts Wildlife Federation 151 Tremont Street Boston, Massachusetts 02111 Plymouth Public Library North Street Plymouth, Massachusetts 02360 Resident Inspector c/o U. S. NRC P. O. Box 867 Plymouth, Massachusetts 02360
,y e.--
w-
REQUEST FOR ADDITIONAL INFORMATION PILGRIM NUCLEAR STATION UNIT 1 CONTAINMENT PURGE VALVE MECHANICAL OPERABILITY
REFERENCE:
Boston Edison Co., (BECo) letter 80-95 dated May 27, 1980.
1.
Provide the following information for the 20.0 inch butterflies.
Rockwell valve's part nunber Bettis operator's part number Solenoid valve's manufacturer and part number 2.
What is the source of the " commercially accepted data for butterflies" used for the 20.0 inch valve analysis? What was the value of the dynamic torque coefficient (C ) used? Were installation effects accounted for T
in the determination of dynamic torque developed? Dynamic torque is known to be affected by valve relation to upstream elbows, shaft orientation relative to elbows, disc closure direction relative to upstream elbows.
3.
What were identified as the critical parts in these 20.0 inch valves (shaft, disc to shaft pins, other)? What were the stresses calculated?
Do they include simultaneous seismic loading? What are the design allow-able stresses? What code or standards are the valves designed to?
4.
Are any of the 20.0 inch valves inside containment? For those valve assemblies (with air operators) inside containment, has the containment pressure rise (backpressure) been considered as to its affect on torque j
margins available (to close and seat the valve) from the actuator? During the closure period, air must be vented from the actuators opening side through the solenoid valve into this backpressure. Discuss the installed actuator bleed configuration and provide basis for not considering this backpressure affect a problem on torque margin. Valve assembly using 4 l
way solenoid valve should especially be reviewed.
5 ~.' Do the 20.0 inch valves use accumulators as the fail-safe feature? Where air operated valve assemblies use accumulators as the fail-safe feature, describe the accumulator air system configuration and its operation.
Provide necessary information to show the adequacy of. the accumulator to stroke the valve i.e. sizing and operation starting from lower limits of initial air pressure charge. Discuss active electrical components in the accumulator system and the basis used to determine their qualification for the environmental conditons experienced. Describe the extent to which the accumulater system is seismically designed.
6.
Describe the modification made to the valve assembly to limit the opening angle. With this modification, is there sufficient torque margin avail-able from the operator to overcome any dynamic torques developed that tend l
to oppose valve closure, starting from the valve's initial open position?
Is there sufficient torque margin available from the operator to seat the valve against seating and bearing torques developed?
. 7.
Describe the tests and/or analysis performed to establish the qualification of the valve to perform its intended function under the environmental conditions exposed to during and after the DBA following its long term ex-posure to the normal plant environment.
What basis is used to establish the qualification of the valve, operators, solenoid valves? How was the valve assembly (valve and operator) seismic-ally qualified (test / analysis)?
Where testing was accomplished, describe the type tests performed, con-ditions used etc. Tests (where applicable) such as flow tests, aging simulation (thermal, radiation, wear, vibration endurance, seismic), LOCA environment (radiation, steam, chemicals) should be pointed out.
Where analysis was used, provide the rationale used to reach the decision that analysis could be used in lieu of testing. Discuss conditions, assumptions, other test data, handbook data, and classical problems as they may apply.
8.
Have the preventive maintenance instructions (part replacement, lubrica-tion, periodic cycling, etc.) established by the manufacturer been re-viewed, and are they being followed? Consideration should especially be given to elastomeric components in valve body, operators, solenoids, where this hardware is installed inside containment.
9.
Describe the Inservice Test Program (ASME,Section XI) presently being conducted or planned for the subject valves.
- 10. Provide an assessment of the structural capability of any ducting or piping 4 ~ ~
in the purge system which is upstieam or downstream of the valves and is exposed to the flow conditions associated with the LOCA and the seismic event.
The staff is particularly interested in the effects thatloose debris from the pipe or duct system may have on the closure capability of these valves.