ML20040B051
| ML20040B051 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/31/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| LSO5-81-12-103, NUDOCS 8201250047 | |
| Download: ML20040B051 (4) | |
Text
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DISTRIBUTION /
4 Docket U
December 31, 1981 NRC PDR Local PDR ORB Reading NSIC DCrutchfield HS th Docket No. 50-245 LS05-81-12-103 OELD OI&E (3)
ACRS (10)
SEPB Mr. W. G. Counsil. Vice President Nuclear Engineering and Operations u%p 4
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Northeast Nuclear Energy Company
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llartford, Connecticut 06101
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Dear Mr. Counsil; c.
SUBJECT:
CONTAINMENT PURGING - MILLSTONE UNIT NO. 1 J
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_,t y By letters dated April 23,1979, May 20,1981 and July 1,1981 you Ra.ve ~~
provided infomation relevant to containment purge and vent valve open/
close conditions. However, our contractor requires additional infoma-tion to continue with the evaluation of this aspect of purge and vent valve safety. Please respond within 30 days of receipt of this request.
This request for infomation involves fewer than 10 licenseos and, therefore, does not require OfiB clearance.
Sincerely, Original signed by Walter A. Paulson for/
Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing
Enclosure:
Request for Additional Infomation cc w/ enclosure:
See next page 9201250047 911231 PDR ADOCK 05000245 p
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Mr. W. G. Counsil December 31, 1981 cc William H. Cuddy, Esquire Connecticut Energy Agency Day, Berry & Howard ATTN:
Assistant D.irector Counselors at Law Research and Policy One Constitution Plaza Development Hartford, Connecticut 06103 Department of Planning Lad Encrgy Policy Natural Resources Defense Council 20 Grand Street 91715th Street, N. W.
Hartford, Connecticut D6106 Washington, D. C.
20005 Northeast Nuclear Energy Companf ATTN:
Superintendent Millstone Plant P. O. Box 128 Waterford, Connecticut 06385 Mr. Richard T. Laudenat Manager, Generation Facilities Licensing Northeast Utilities Service Conpany.
P. O. Box 270 Hartford, Connecticut 06101 Resident Inspector c/o U. S. NRC P. O. Box Drawer KK Niantic, Connecticut 06357 Waterford Public Library Rope Ferry Road, Route 156 Waterford, Connecticut 05385 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 s
John F. Opeka Systems Superintendent Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 U. S. Environmental Protection Agency Region 1 Office e
ATTN:
EIS COORDINATOR
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JFK Federal Building Boston, Massachusetts 02203 O
ADDITIONAL INFORMATION REQUIRED TO EVALUATE CONFORMANCE TO GUIDELINES OF BTP, CSB 6-4 REV. 1
" CONTAINMENT PURGING DURING NORMAL OPERATION" MILLSTONE UNIT NO. 1 DOCKET NO. 50-245 1.
Identify the current restrictions that limit purge / vent valve opening (valves >- 3 inches) during Millstone 1 power operation, o How are these restrictions imposed?
o How has the necessity for Nj purging to maintain Torus /drywell 1 psid changed since vacuum breaker valve discs and seals were reworked during most recent refueling outage? (Refer to NNECO letter dated June 20, 1980) o Can opening of containment purge and vent valves (valves >3 inches) be limited to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after startup and prior to shut-down without reducing plant availability?
If yes, the Technical Specifications should be changed to require such limit.
If not explain.
o Will the currently required Torus drywell psid be necessary when Mark 1 containment modifications are completed during the 1982 refueling outage? Explain.
2.
Provide an analysis that includes the calculated amounts of air, steam and radioactivity released to atmosphere, for the worst DBE, through open purge air supply and exhaust valves prior to automatic closure of the valves.
o Describe conditions downstream of the containment exhaust valve and upstream of the air purge valve prior to closure following DBE.
o Provide an analysis to show that debris screens are not necessary to assure valve closure when required or commit to install seismic category 1 debris screens at least one pipe diameter from down-stream valves.
o Provide an analysis to show that (1) overpressure damage downstream of the purge exhaust valve (standby gas treatment system) or up-stream of the purge air intake (ventilation system); following. the' DBE with valves open will not cause damage to structures or safety related equipment that could affect the health and safety of the public or (2) damage can be prevented by design modifications that should be identified.
o Identify the purge / vent piping that satisfies seismic Category 1 design standards.
2-s 3.
Propose leakage integrity Technical Specifications tests for purge / vent containment isolation valves,at three months intervals, to identify excessive degradation of the resilient seats for these valves. They need not be' conducted with the precision required for the Type C isolation valve tests in 10 CFR Part 50, Appendix J.
These tests would be perfonned in addition to the quantitative Type C tests required by Appendix-J, and would not relieve the licensee of the responsibility to conform to the requirements of Appendix J.
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