ML19253C377
| ML19253C377 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 11/16/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 7912050286 | |
| Download: ML19253C377 (1) | |
Text
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o, UNITED STATES y ) ') s, ( (,g NUCLEAR REGULATORY COMMISSION ti ? \\ "#/ / C REGION I o, f'd
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KING OF PRUSSIA, PENNSYLVANIA 19406
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D I3iM Docket Nos. 50-277 50-278 Philadelphia Electric Company ATTN:
Mr. S. L. Daltroff Vice President Electric Production 2301 Market Street Philadelphia, Pennsylvania 19101 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 PWR units.
If you have any questions regarding this matter, please contact this office.
Sincerely, f)xn277..&&=
- Bo ce H. Grier f
ector
Enclosures:
1.
IE Information Notice No. 79-27 2.
List of Recently Issued Information Notices CONTACT:
W. H. Baunack (215-337-5334) cc w/encls:
W. T. Ullrich, Station Superintendent Troy B. Conner, Jr., Esquire Eugene J. Bradley, Esquire Raymond L. Hovis, Esquire Michael J. Scibinico, II, Assistant Attorney General 1503 058 7912050 Ef(
ENCLOSURE 1 SSINS No.:
6870 Accession No.:
7910250488 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON D.L.
20555 IE Information Notice No. 79-27 Date:
November 16, 1979 Page 1 of 9 STEAM GENERATOR TUBE RUPTURES AT TWO PWR PLANTS 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 Belgiun 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 systems 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 :he 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, requiring startup of a second
- 1. 8 charging pump.
2.
A"'.omatic isolation of the CVCS letdown line.
2.4 3.
' Jt off of the prr.ssurizer heaters due to low liquid level in the 2.4 pressurizer.
DUPLICATE DOCUMENT Entire document previously 1503 059 enterea into system under:
ANO b
No. of pages: