ML17318A336
| ML17318A336 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 10/01/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Dolan J AMERICAN ELECTRIC POWER CO., INC. |
| References | |
| NUDOCS 7910180594 | |
| Download: ML17318A336 (4) | |
Text
C'G 3
Docket No. 50-315 Docket No. 50-316 American Electric Power Service Corporation Indiana and Michigan Power Company ATTN:
Mr. John E. Dolan Vice Chairman Engineering and Construction 2 Broadway New York, NY 10004 Gentlemen:
The enclosed IE Information Notice No. 79-24 provides information with I'egard to an analysis that identifies an event that could result in over-pressurization of containment at a pressurized water reactor.
Sincerely, James G. Keppler Director
Enclosure:
IE Information Notice No. 79-24 cc w/encl:
Mr. D. V. Shaller, Plant Manager Central Piles
- Director, NRR/DPM
- Director, NRR/DOR PDR Local PDR NSIC TIC Ronald Callen, Michigan Public Service Commission Citizens for a Better Environment 10/1/79 K ppler 9~0ysQ M
SSINS:
6870 Accession No:
7908220123 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.
C.
20555 October 1, 1979 IE Information Notice No. 79-24 OVERPRESSURIZATION OF CONTAINMENT OF A PWR PLANT AFTER A MAIN STEAM LINE BREAK Virginia Electric and Power Co. submitted a report dated September 7, 1979 that identified a deficiency in the original analyses of containment pressurization as a result of a steam line break for North Anna Power Station, Units 3 and 4.
Stone and Webster Engineering Corporation performed a reanalyses of containment pressure following a main steam line break and determined that, if the auxiliary feedwater system continued to supply feedwater at runout conditions to the steam generator that had experienced the steam line break, containment design pressure would be exceeded in approximately 10 minutes.
The long term blowdown of the water supplied under runout conditions by the auxiliary feedwater system had not been considered in the earlier analyses.
The corrective action is now under review by the owner, architect engineer, and NSSS supplier.
This Information Notice is provided as an early notification of a possibly significant matter that is still under review by the NRC staff. It is expected that recipients will review the information for possible applicability to their facilities.
No specific action or response is requested at this time. If NRC evaluations so indicate, further licensee actions may be requested or required.
No written response to this Information Notice is required.
If you have any questions regarding this matter please contact the Director of the appropriate NRC Regional Office.
Enclosure:
List of IE Information Notices Issued in the Last Six Months
IE Information Notice No. 79-24 October 1, 1979 Enclosure Page 1 of 2 LISTING OF IE INFORMATION NOTICES ISSUED IN LAST SIX MONTHS 79-10 Nonconforming Pipe Support Struts Information Subject Notice No.
Date Issued 4/16/79 Issued To All power reactor facilities with a CP 79-11 79-12 79-13 79-14 79-15 79-16 79-17 Lower Reactor Vessel Head Insulation Support Problem Attempted Damage to New Fuel Assemblies Indication of Low Water Level in the Oyster Creek Reactor NRC Position of Electrical Cable Support Systems Deficient Procedures Nuclear Incident at Three Mile Island Source Holder Assembly Damage Damage From Misfit Between Assembly and Reactor Upper Grid Plate 5/7/79 5/11/79 5/29/79 6/11/79 6/7/79 6/22/79 6/20/79 All holders of Reactor OLs and CPs All Fuel Facilities Research
- Reactors, and Power Reactors with an OL or CP All Holders of Reactor OLs and CPs All Power Reactor Facilities with a CP All Holders of Reactor OLs and CPs All Research Reactors and Test Reactors with OLs All Holders of Reactor OLs and CPs 79"18 79-19 Skyl ab Reentry Pipe Cracks In Stagnant Borated Water Systems At PWR Plants 7/5/79 All Holders of Reactor OLs 7/17/79 All Holders of Reactor OLs and CPs
IE Information Notice No. 79-24 October 1, 1979 LISTING OF IE INFORMATION NOTICES ISSUED IN 1979 Encl osur e Page 2 of 2 Information Subject Notice No.
79-20 NRC Enforcement Policy NRC Licensed Individuals Date Issued 8/10/79 Issued To All Holders of Reactor OLs and CPs and Production Licensees with Licensed Operators 79-21 79"22 79"23 Transportation and Commercial 9/7/79 Burial of Radioactive Material qualification of Control 9/14/79 Systems Emergency Diesel Generator 9/26/79 Lube Oil Coolers All power and research reactors with OL's All power reactor facilities with operating licenses and construction permits.