ML19225A069
| ML19225A069 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs, Saint Lucie, Maine Yankee |
| Issue date: | 05/09/1979 |
| From: | Grimes B Office of Nuclear Reactor Regulation |
| To: | BALTIMORE GAS & ELECTRIC CO., FLORIDA POWER & LIGHT CO., NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 7907180235 | |
| Download: ML19225A069 (8) | |
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UNITED STA IES I
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TO OPERATING COMBUSTION ENGINEERING PLANTS Gentlemen:
As part of our review of currently operating reactorc to safely withstand an event similar to that which nappened at Three Mile Island Unit No. 2, analyses are required of sim'lar events of pressurized water reactors designed by other nuclear steam system supplies. We have requested ComDustion Engineering to provide responses to the questions in the enclosure to this letter. To provide the response some plant specific information will oe required.
You are requested to tooperate with your nuclear steam system supplier to allow completion of this effort in a timely manner.
We have t'een informed that this effort can be expected to be com leted in a few days.
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_K. Grimes, Assistant Director
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orian for Engineering & Projects Division
Enclosure:
Questions Regarding Small Break Analyses 34'o 3 l.[f
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Questions Regarding Small Break Analyses The re.ponse of the primary system to a small creak will differ greatly depending on the break size, its location in the system, operation of the react)r coolant pumps, number of ECCS systems functioning, and the availability of secondary sida cooling. To evaluate the response of your system, the following information is needed:
1.) Provide a description of system behavior for a) a range of postulated small break LOCAs. including the zero break case, and b) feedwater related limiting transients combined with a stuck open power operated relief valve.
These cases should include situations where auxiliary feedwater is both assumed available and not available. The cases con:;idered should also discuss breaks large enough to a) depressurize the primary system, b) maintain tha primary systems at some intermediate pressure, and c) repressurize the primary system to the safety valve set point pressure. The breaks should be considered at various locations in the primary system including the pressurizer.
2.) Describe the various natural circulation modes of your system following a small break LOCA.
Provi@ justification of these modes of operation.
Discuss any ways in wnich natural circulation can be interrupted.
In particular, discuss the applicability of the concerns in the Michelson report to U-tube steam generators.
Assess the psssible effects of nor.-
condensible gases containcd in the primary system.
3.) Prnvide a safety evaluation for a spectrum of small break and limiting transients corbined with c. stuck open valve as discussed in Question No.1 (best estimate or evaluation model).
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2 a.) Show that the analysis methods can handle each of the cases discussed.
Provide appropriate verification for the methods (e.g., comparison with experiments, TMI 2 evaluation).
b.) Provide a list of transients expected to lift PORVs, and justify the assumed steam and two-phase flow rates through the valves.
c.) Provide analyses for a typical plant as discussed in Question No. 1.
If the scenario is different for various classes of plants, an example of each kind should be provided. This should include cases that do and do not initiate HPI.
d.) Sensitivity stuuies for the above evaluations shall include consideration of a) availability of zero and one train of AFWs, b) failures in ECCS, c) operator action necessary for safe shutdown, and d) factors affect;ng natural circulation. The analyses should also consider asyninetric auxiliary feedwater Lc steam generators.
4.) Provide guidelines for the recovery of plants following small LOCAs.
This shsuld include both short-term and long-term situations and follow through to a stable condition.
The guidelines should include recognition of the event, precautions, actions, and prohibited actions.
If RC pump opernion is assumed under two-phase con >itions, a justification of pump operability should be provided.
Discuss instrumentation
< /ailable to the operator and any instrumentation that might give conflicting or misleading indications during these events if solely relied on (e.g., pressurizer level).
What would be the effect of this instrumentation on automatic protection actions?
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Baltinore Gas & Electric Company cc:
Janes A. Biddison, Jr.
Mr. R. ft. Douglass, Manager General Counsel Quality Ass'irance Department G and E Building Room 923 Gas & Electric Building Charles Center P. O. Box 1475 Bal timore, Maryland 21203 Baltimore, Maryland 212C3 George F. Trowbridge, Esquire Shaw, Pi ttnan, Pc tts and Trowbridge 1800 M Street, II.U.
Washington, D. C.
20036 fir. R. C. L. Ol son Baltinore Gas and Electric Company Room 922 - G and E Building Post Office Box 1475 Bal timore, Maryl and 21203 fir. Leon B. Russell. Chief Engineer Calvert Cl:, fs Muclear Power Plant Bal tinore Gas and Electric Company Lusby, liaryl and 20657 Bechtel Pow 'r Corporation ATTtJ:
Mr. J. C. Judd Chief Nuclear Engineer 15740 Shady Grove Road Gaithersburg, Maryland 20760 Canbustion Engineering, 'nc.
ATTN:
[1r. P. W. Kruse, flanager Engineering Services Post Office Box 500 Windsor, Connecticut 06095 Calvert County uibrary Prince Frederick, Maryland 20678 349 319
Florida Power & Light Company cc:
Robert L.owenstein, Esquire Lowenstein, Newnan, Reis & Axelrad 1025 Connecticut Avenue, N.W.
Washington, D. C.
20036 Norman A. Coll, Esquire McCarthy, Steel, Hector & Davis 14th Floor, First National Bank Building Miami, Florida 33131 Mr. Jack Shreve Office of the Fublic Counsel Room 4, Holland Bldg.
Tallahassee, Florida 32304 Indian River Junior College Library 3209 Virginia Avenue Fort Pierce Florida 33450 3 /l 9
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Northeast Nuclear Ener,y Company CC:
William H. Cuddy, Esquire Day, Berry & Howard Counselors at Law One Constitutier Plaza Hartford, Connecticut 06103 Waterford Pu' lic Library o
Rope Ferry Road, Route 156 Waterford, Connecticut 06385 Northeast Nuclear Energy Company ATIN:
Superintendent Millstone Plant Post Of fice Sox 128 Wc terfo rd, Connecticut 06385 Northeast Utilities Service Company ATTN:
Mr. Jares R. Hinmeiwright Nuclear Engineering and Operations P. O. Box 170 Hartford, Connectit ut 06101 Anthony Z. Roisman, csq.
Natural Rescurces Defense Council 917 15 t h Street, N.W.
Washingtcn, D.C.
20005 Mr. John T. Shedlosky Nuclear Reculatory Commission, Region I Office of Inspection and Enforcement 631 Park Avenue King of Prussia, Pennsylvania 19406 1o 79i biti J L. 1
Onana Public Power District cc:
flargaset R. A. Paradis LeBoeuf, Lamb, Leiby & flacRae 1757 t1 Street, ti.W.
Washington, D. C.
20036 Blair Public Library 1665 Lincoln Street Bl air, flebraska 68008 g
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Yankee Atenic Electric Company cc:
E. W. Thurlow, President fir. Robert R. Radclif fe flaine Yankee Atonic Power Company Of fice of Energy Resources
- Green Street 55 Capitol Street Augusta, flaine 04330 Augusta, Maine 04330 fir. Donald E. Vandenburgh Vice President - Engineering Yankee Atonic Electric Company 20 Turnpike Road Westboro, !!assachusetts 01581 John A. Ritsher, Esquire Ropes and Gray 225 Franklin Street Boston, fiassachusetts 02110 f1r. John fl. R. Paterson Assistant Attorney General State of Maine Augusta,t1aine 04330 Mr. Nicholas Barth Executive Director Sheepscot Valley Conservation Association, Inc.
P. O. Box 125 Alna, Maine 04535 Wiscasset Public Library Association High Street Wiscasset, fiaine 04578 Mrs. L. Patricia Doyle, President SAFE POWER FOR f1AINE Post Of fice Box 774 Cancen, flaine 04843 323