ML15238B276
| ML15238B276 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 02/03/1981 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 8102260042 | |
| Download: ML15238B276 (3) | |
Text
FEBRUARY 3 01 DUIB L PDR ORB#4 Rdg RIngram 00 1i e 3 TERA-3 DEisenhut OELD
'NRC.PDR NSIC RPurple AEOD Dockets Nos. 6 V-269, 50-270 Tddesco, R IE-3 and 50-287
'GLaina Atk-6 TNovak G~hy'ile RReid HOrnstein GVissing EBlackwood V
Mr. William 0. Parker, Jr.
MFairtile D. Verrelli Vice President & Steam Production
"T'Speis Duke Power ComiFanyE0c 19 P. 0. Box 2178
-t 422 South Church Street Charlotte, North Carolina 28242
Dear Mr. Parker:
We have completed our review of your letter dated January 24, 1980, which responded to our request for information dated November 2 1979, con cerning the loading on steam generator tubes nduced slug low during natural circulation in B&W reactor plants.
In order to bound the magnitude of the loading on the steam generator tubes during natural circulatjon, your analysis assumes that the slug travels at a velocity of 64.4 ft/sec. Tfis corresponds to full power, forced flow operation and bounds any presure differential which could develop under natural circulation.
By use of the dynamic mmentum equation, the maximum force on eactube.as a res ult o the force on the.upper tube sheet would be less than 1f/0 of tube's theoretical buckling load of 700 pounds. Based on thifs anaysis wecconclude that slug flow induced by natural circu aton will not resu t in a evers loading of the steam generator tubes Therefore, we.consider Item II.K.2.15 "Effect of Slug Flow on Steam Generator Tubes" of the TMI Acion Plan Requirements is resolved for the Oconee Nuclear Station, Unfts Nos. 1,2 and 3.
Sincerely, Robrgy0 Reid Robert W. Reid, Chief Operating Reactors Branch #4 Division of Licensing cc:
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o6b o OFFICER#4:D ORB DL C-.
SURNAMEO'77a rI e/c n.
DATE 2/2 /81 NRC FORM 318 10/80 NRCM 0240 OFFICIAL RECORD COPY8 A USGPO190
o RE, UNITED STATES NUCLEAR REGULATORY COMMISSION WASMINGTON, D. C. 20555
++
4February 3, 1981 Dockets Nos.
50-269, 50-270 and 50-287 Mr. William 0. Parker, Jr.
Vice President -
Steam Production Duke Power Company Pi 0. Box 2178 422 South Church Street Charlotte, North Carolina 28242
Dear Mr. Parker:
We have completed our review of your letter dated January 24, 1980, which responded to our request for information dated November 21, 1979, con cerning the loading on steam generator tubes induced by slug flow during natural circulation in B&W reactor plants.
In order to bound the magnitude of the loading on the steam generator tubes during natural circulation, your analysis assumes that the slug travels at a velocity of 64.4 ft/sec. This corresponds to full power, forced flow operation and bounds any pressure differential which could develop under natural circulation.
By use of the dynamic momentum equation, the maximum force on each tube as a result of the force on the upper tube sheet would be less than 1/10 of the tube's theoretical duckling load of 700 pounds. Based on this analysis we conclude that slug flow induced by natural circulation will not result in adverse loading of the steam generator tubes.
Therefore, we consider Item II.K.2.15 "Effect of Slug Flow on Steam Generator Tubes" of the TMI Action Plan Requirements is resolved for the Oconee Nuclear Station, Units Nos. 1, 2 and 3.
Sincerely, Robert W. Reid, Chief Operating Reactors Branch #4 Division of Licensing cc:
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Duke Power Company cc w/enclosure(s):
Mr. William L. Porter Duke Power Company P. 0. Box 2178 422 South Church Street Office of Intergovernmental Relations Charlotte, North Carolina 28242 116 West Jones Street Raleigh, North Carolina 27603 Oconee Public Library 201 South Spring Street Walhalla, South Carolina 29691 Honorable James M. Phinney County Supervisor of Oconee County Walhalla, South Carolina 29621 Director, Criteria.and Standards Division Office of Radiation Programs (ANR-460)
U. S. Environmental Protection Agency Washington, D. C. 20460 U. S. Environmental Protection Agency Region IV Office ATTN:
EIS COORDINATOR 345 Courtland Street, N.E.
Atlanta, Georgia 30308 Mr. Francis Jape U.S. Nuclear Regulatory Commission Route 2, Box 610 Seneca, South Carolina 29678 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 420, 7735 Old Georgetown Road Bethesda, Maryland 20014 Manager, LIS NUS Corporation 2536 Countryside Boulevard Clearwater, Florida 33515 J. Michael McGarry, III, Esq.
DeBevoise & Liberman 1200 17th Street, N.W.
Washington, D. C. 20036