ML19253C194
| ML19253C194 | |
| Person / Time | |
|---|---|
| Site: | Hatch, Vogtle  |
| Issue date: | 11/16/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | John Miller GEORGIA POWER CO. |
| References | |
| NUDOCS 7911300133 | |
| Download: ML19253C194 (2) | |
Text
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'o UNITED STATES 8'3, 7,,o NUCLEAR REGULATORY COMMISSION
- .). E REGION 11 i f f-o, 101 MARIETTA ST., N.W., SUITE 3100 o
ATLANTA, GEORGIA 30303 NOV 161979 In Reply Refer To:
RI *Tm J21, 53-3)1 >
5@42),30-425,/
Georgia Power Company Attn:
J. H. Miller, Jr.
Executive Vice President 270 Peachtree Street, N.W.
Atlanta, Georgia 30303 Gentlemen:
The enclosed IE Information Notice No. 79-27 provides information with regard to the sequence of events that followed incidents involving steam generator tube ruptures at two PUR units.
Sincerely, h' T4.s.
C James P. O'Reill Director
Enclosures:
IE Information Notice No. 79-27 2.
List of IE Information Notices Issued in the Last Six Months 1443 625 I
7911300
NOV 161979 Georgia Power Company.
cc w/ encl:
M. Manry, Plant Manager Post Office Box 442 Baxley, Georgia 31513 C. E. Belflower Site QA Supervisor Post Office Box 442 Baxley, Georgia 31513 K. M. Gillespie Construction Project Manager Post Office Box 282 Waynesboro, Georgia 30830 E. D. Groover QA Site Supervisor Post Office Box 282 Waynesboro, Georgia 30830 bkhb
SSINS No.:
6870 Accession No.:
7910250488 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON D.C.
20555 November 16, 1979 IE Information Notice No. 79-27 STEAM GENERATOR TUBE RUPTURES AT TWO PWR PIANTS Description of Circumstances:
In recent months two incidents involving steam generator tube ruptures have occurred.
In both instances, the units were cooled down and placed in the residual heat removal mode with existing procedures.
Event of June 25, 1979, at the Doel 2 Nuclear Power Plant in Belgium The first event occurred on June 25, 1979, at the Doel 2 nuclear power plant in Belgium. The Doel unit is a 390 Mwe Westinghouse two-loop reactor. The event consisted of a rupture of several tubes in the loop B steam generator. The resultant leakage between the primary and secondary s/ stems was estimated to be 125 gpm.
The event started when the plant was heated up after a shutdown caused by a malfunction of the main steam isolation valve. At the time of the incident the primary coolant pressure was 2233 psi and the temperature 491 F.
The reactor remained subcritical throughout the event.
The first indication of abnormal behavior was a rapid decrease of the primary system pressure (approximately:
28 psi / min.).
This was followed by the sequence of events listed below:
Time, min.
1.
Increase of charging flow demand, r iirin start charging pump.
2.
Automatic isolation of the CVCS le DUPLICATE DOCUMENTjd4}
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3.
Shut off of the pressurizer heater pressurizer.
Entire document previously entered into system under:
h ANO No. of pages:
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