ML19343B492
| ML19343B492 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 11/26/1980 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 8012240067 | |
| Download: ML19343B492 (3) | |
Text
~. -
I b s' m g>A #f ou f*
f,,
UNITED STATES y
er g
NUCLEAR REGULATORY COMMISSION
- p wAssmorosv. o. c. rosas
\\*.v /
NOV 2 6 beu Docket No. 50-245
- J
, ~,t Mr. W. G. Counsil, Senior Vice President Nuclear Engineering and Operations Northeast Nuclear Energy Company Post Office Box 270 Hartford, Connecticut 06101 u
t.,
i;
Dear Mr. Counsil:
SUBJECT:
CONTAINMENT PURGE / VENT VALVE - MILLSTONE UNIT 1 We are continuing our review of your submittal dated August 8,1980, which provided the results of the operability review of Millstone 1 purge / vent valves. To complete our review, we require the additional information described in the enclosure to this letter.
Sincerely, G. C. Lainas, Assistant Director for Safety Assessment Division of Licensing
Enclosure:
Request for Additional Information cc w/ enclosure:
See next page l
l 8012240067 f
Mr. W. G. Counsil 1
l Cc William H. Cuddy, Esquire Connecticut Energy Agency Day, Berry & Howard ATTN: Assistant Director Counselors at Law Research and Policy One Constitution Plaza Development Hartford, Connecticut 06103 Department of Planning and Energy Policy Natural Resources Defense Council 20 Grand Street 91715th Street, N. W.
Hartford, Connecticut 06106 Washington, D. C.
20005 Director, Criteria and Standards Division Northeast Nuclear Energy Company Office of Radiation Programs ATTN: Superintendent (ANR-460)
Millstone Plant U. S. Environmental Protection P. O. Box 128 Agency Waterford, Connecticut 06385 Washington, D. C.
20460 Mr. James R. Hinnelwright U. S. Environmental Protection Northeast Utilities Service Conpany Agency P. O. Box 270 Region ! Office Hartford, Connecticut 06101 ATTN: EIS COORDINATOR JFK Federal Building Resident Inspector Boston, Massachusetts 02203 c/o U. S. NRC P. O. Box Drawer KK R. E. Schaffstall, Exeuctive Director Niantic, Connecticut 06357 for SEP Owners Group
'747 Pennsylvania Avenue, NW i
Waterford Public Library Washington, D.C.
20006 Rope Ferry Road, Route 156 Waterford, Connecticut 06385 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 John F. Opeka Systens Superintendent Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101
l l
REQUEST FOR ADDITIONAL' INFORMATION MILLSTONE UNIT 1
~
CONTAINMENT PURGE / VENT VALVE MECHANICAL OPERABILITY l.
Mave the torque curves in Enclosure 2 been reviewed by Bettis to confirm that the torque rating of the operators are not exceeded at any position in the stroke?
2.
Provide confirmation that the operator torque output at the seating position is sufficient to overcome combined seating and bearing torque developed.
3.
Provide the maximum combined torsional shear stress plus direct shear stress developed in the shafts and the corresponding safety factors.
i 4
Provide the safety factors that are inherent in the design of the shaft to disc pins.
5.
Describe the extent to which the pilot solenoid valves are environmentally and seismically qualified.
Do any components of these solenoid valves have a limited design life where periodic replacement is required?
~ '
Describe the extent to which the operators are environmentally and seismically 6.
quali fied.
Do any components of the operators have a limited design life.
where periodic replacement is required?
7.
Do the elastomeric components in the valve body have a limited design life where periodic replacement is required? Describe what in-service testing /
inspections are accomplished to check the integrity of the reals.
8.
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 conditions associated with the LOCA coincident with the seismic The staff is particularly interested in the effects that loose debris event.
from the pipe or duct system may have on the closure capability of these val'ves.
--r
---v--
,--,,,,,,,w--,
-