ML19259D330
| ML19259D330 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 10/01/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7910170774 | |
| Download: ML19259D330 (2) | |
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION
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ATLANTA, GEORGIA 30303 OCT 11979 In Reply Refer To:
RII:JPO C$93 South Carolina Electric and Ges Company Attn:
M. C. Johnson, Vice President Special Services and Purchasing Post Office Box 764 Columbia, South Carolina 29218 Centlemen:
The enclosed Information Notice provid. information with regard to an analysis that identifies an event that could result in overpressurization of containment at a pressurized water reactor.
Sincerely, N
James P. O'Reilly Director
Enclosures:
1.
Information Notice No. 79-24 2.
List of IE Information Notices Issued in the Last Six Months 1160 318 f
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007 1 1979 South Carolina Electric g
and Gas Company cc w/ encl:
T. B. Conners, Jr.
. Conners, !!oore and Corber 1747 Pennsylvania Avenue, N.W.
Washington, D.C.
20006 A. A. Smith Quality Assurance Post Office Box 8 Jenkinsville, South Carolina 29065 O. S. Bradham, Manager Nuclear Operations Post Office Box 8 Jenkinsville, South Cr.rolina 29065 i160 5.19
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SSINS:
6870 Accession No: 7908220123 UNITED STATES NUCLEAR REGUIATORY COMMISSION 0FFICE OF INSPECTION AND ENFORCEMENT D
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WASHINGTON, D. C.
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October 1, 1979 IE Information Notice No. 79-24 OVERPRESSURIZATION O'l 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 analysis 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 analysis. 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.
1 60 320
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IE Information Notice No. 79-24 Enclosure Octobe-1, 1979 Page 1 of 2 LISTING OF IE INFORMATION NOTICES ISSUED IN LAST 'IX MONTHS Information Subject Date Issued To Notice No.
Issued 79-24 Overpressurization of 10/1/79 All power reactor Containment of a PWR facilities holding Plant After a Main Steam OLs and cps Line Break 79-23 Emergency Diesel Generator 9/26/79 All Holders of cps Lube Oil Coolers and OLs 79-22 Qualification of Control 9/17/79 All Holders of cps Systems 9/14/79 All Holders of OLs 79-21 Transportation and Commer-9/11/79 All Licensees as Supple-cial Burial of Radioactive mental Information to Meterials IE Bulletin Nos. 79-19
& 79-20 79-20 NRC Enforcement Policy 9/7/79 All Holders of Reactor (Rev. 1)
NRC Licensed Individuals OLs and cps and Production Licensees with Licensed Operators 79-20 NRC Enforcement Policy 8/14/79 All Holders of Reactor NRC Licensed Individuals OLs and cps and Production Licensees with Licensed Operators 79-19 Pipe Cracks in Stagnant 7/18/79 All Holders of Reactor (Correction - Borated Water Systems at OLs and cps Enclosure)
P';R Plants 79-19 Pipe Cracks In Stagnant 7/17/79 All Holders of Reactor Borated Water Syrtems At OLs end cps PWR Plants 79-18 Skylab Reentry 7/6/79 All Holders of Reactor OLs 1160 321
IE Information Notice No. 79-24 Enclosure October 1, 1979 Page 2 of 2 LISTING OF INFORMATION NOTICES ISSUED IN LAST SIX MONTHS Information Subject Date Issued To Notice No.
Issued 79-17 Source Holder Assembly Damage 6/20/79 All Holders of Reactor Damage From Misfit Between OLs and cps Assembly and !ieactor Upper Grid Plate 79-16 Nuclear Incident at Three 6/22/79 All Research Reactort Mile Island and Test Reactors with OLs 79-15 Deficient Procedures 6/7/79 All Holders of Reactor OLs and cps 79-14 NRC Position of Electrical 6/11/79 All Power. Reactor Cable Support Systems Facilities with a CP 79-13 Indication of Low Water 5/29/79 AI4 -lolders of Reactor Level in the Oyster Creek OLs and cps Reactor 79-12 Attempted Damage to New 5/10/79 All Fuel Facilities Fuel Assemblies Research Reactors, and Power Reactors with an OL or CP 79-11 Lower Reactor Ve,sel Head 5/7/79 All holders of Reactor Insulation Support Problem OLs and cps 60 322 O
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