ML18136A063
| ML18136A063 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 10/01/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7910170778 | |
| Download: ML18136A063 (5) | |
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UNITED STATES
- NUCLEAR REGULATORY COMMISSION REGION II 101 MARIETTA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303 OCT 1 1979 In Reply Refer To:
RII:JPO 50-338, 50-339 50-404, 50-405
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Virginia Electric and Power Company Attn:
W. L. Proffitt Senior Vice President, Power P. O. Box 26666 Richmond, Virginia 23261 Gentlemen:
The enclosed Information Notice provides information with regard to an analysis that identifies an event that could result in overpressurization of containment at a pressurized water reactor.
Sincerely,
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James P. O'Reill Director
Enclosures:
- 1.
- 2.
List of IE Information Notices Issued in the Last Six Months
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Virginia Electric and Power Company cc w/encl:
e W.R. Cartwright, Station Manager Post Office Box 402 Mineral, Virginia 23117 P. G. Perry Senior Resident Engineer Post Office Box 38 Mineral, Virginia 23117 W. L. Stewart, Manager Post Office Box 315 Surry, Virginia 23883
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OCT 1 1979 r-UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 October 1, 1979 SSINS:
6870 Accession N~: 7908220123 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 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 feedwate~ 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 Directo~ of the appropriate NRC Regional Off ice..
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IE Information Notice No. 79-24 October 1, 1979 Information Notice No. 79-24 79-23 79-22 79-21 79-20 (Rev. 1) 79-20 79-19 (Correction -
Enclosure) 79-19 79-18 LISTING OF IE INFORMATION NOTICES ISSUED IN LAST SIX MONTHS Subject Overpressurization of Containment of a PWR Plant After a Main Steam Line Break Emergency Diesel Generator Lube Oil Coolers Qualification of Control Systems Transportation and Commer-cial Burial of Radioactive Materials NRC Enforcement Policy NRC Licensed Individuals NRC Enforcement Policy NRC Licensed Individuals Pipe Cracks in Stagnant Borated Water Systems at PWR Plants Pipe Cracks In Stagnant Borated Water Systems At PWR Plants Skylab Reentry Date Issued 10/1/79 9/26/79 9/17/79 9/14/79 9/11/79 9/7/79 8/14/79 7/18/79 7/17/79 7/6/79 Enclosure Page 1 of 2 Issued To All power reactor factlities holding OLs and CPs All Holders of CPs and OLs All Holders of CPs All Holders of OLs All Licensees as Supple-mental Information to IE Bulletin Nos.. 79-19
& 79-20 All Holders of Reactor OLs and CPs and Production Licensees with Licensed Operators All Holders of Reactor OLs and CPs and Production Licensees with Licensed Operators All Holders of Reactor OLs and CPs All Holders of Reactor OLs and CPs All Holders of Reactor OLs
IE Information Notice No. 79-24 October.1, 1979 Information Notice No. 79-17 79-16 79-15 79-14 79-13 79-12 79-11 LISTING OF INFORMATION NOTICES ISSUED IN LAST SIX MONTHS Subject Date Issued Source Holder Assembly Damage 6/20/79 Damage From Misfit Between Assembly and Reactor Upper Grid Plate Nuclear.Incident at Three 6/22/79 Mile Island Deficient Procedures 6/7/79 NRC Position of Electrical 6/11/79 Cable Support Systems Indication of Low Water 5/29/79 Level in the Oyster Creek Reactor Attempted Damage to New 5/10/79 Fuel Assemblies Lower Reactor Vessel Head 5/7/79 Insulation Support Problem Enclosure Page 2 of 2 Issued To All Holders of Reactor OLs *and CPs All Research Reactors and Test Reactors with OLs All Holders of Reactor OLs and CPs All Power.Reactor Facilities with a CP 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