ML19254C982
| ML19254C982 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/01/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7910190221 | |
| Download: ML19254C982 (1) | |
Text
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UNITED ST ATES
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E NUCLE AR REGULATORY COMMISSION
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1300 N. CAllFORNI A BOULEVARD
,8 SulTE 202, V/ALNUT CREE K PLAZA WALNUT CRE E K, C ALIFORNI A 91596 October 1, 1979 Docket flo. 50-312 Sacramento I unicipal Utility District P. O. Box 15B30 Sacramento, California 95813 Attention: Mr. John J. Mattimoc Assistant General Manager 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, y((7 d E.~
R. H. Engelken Director
Enclosures:
1.
List of IE Information Notices Issued in the Last Six Months cc w/ enclosures:
R. J. Rodriguez, SMUD L. G. Schwieger, SMUD 1187 036
'T 91019 0 hS!
W
r SSIflS:
6870 Accession No:
7908220123 UNITED STATES "4[2Q@h pl9l.,,A Pr 0
NUCLEAR REGULATORY COMMISSION uL OFFICE OF INSPECTION AND ENFORCEMENT '
a WASHINGT0't, D. C.
2055S October 1, 1979 IE Information flotice flo. 79-24 OVERPRESSURIZATION OF CONTAINMENT OF A PWR PLAf1T 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 fee
.ter at runout conditions to the steam generator that had experienced the steam sine break, containment design pressure would be exceeded in approximately 10 minutes.
The long tern 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 significcnt 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 writtan response to this Information Notice is required.
If you have any questions regarding this matter please t. : tact the Director of the appropriate NRC Regional Office.
118f 037
IE Information fictice fio. 79-24 Enclosure October 1, 1979 Page 1 of 2 ISTING OF IE INFORfiATION fiOTICES ISSUED IN LAST SIX MONTHS Inform.^
Subject Date Issued To Notict o.
Issued 79-10 Nonconforming Pipe 4/16/79 All power reactor Support Struts facilities with a CP 79-11 Lawer Reactor Vessel Head 5/7/79 All holders of Reactor Insulation Support Problem OLs and cps 79-12 Attempted Damage to New 5/2?/79 All Fuel Facilities Fuel Assemblies Research Reactors, and Power Reactors with an OL or "P 79-13 Indication of Low Water 5/29/79 All Holders of Reactor Level in the Oyster Creek OLs and cps Reactor 79-14 NRC Position of Electrical 6/11/79 All Power Reactor Cable Support Systems Facilities with a CP 79-15 Deficient Procedures 6/7/79 All Holders of Reactor OLs and cps 79-16 Nuclear Incident at Three 6/22/79 All Research Reactors Mile Island and Test Reactors with OLs 79-17 Source Holder Assembly Damage 6/c0/79 All Holders of Reactor Damage From flisfit Between OLs and cps Assembly and Reactor Upper Grid Plate 79-18 Skylab RC?ntry 7/5/79 All Holders of Reactor OLs 79-19 Pipe Cracks In Stagnant 7/17/79 All Holders of Reactor Borated Water Systems At CLs and cps PWR Plar..s i189 038
IE Information fiotice flo. 79-24 Enclosure October 1, 1979 Page 2 of 2 LISTIrlG OF IE IflFORi4ATION fl0TICES ISSUED Ill 1979 Information Subject Date Issued To flotice fio.
Issued 79-20 flRC Enforcement Policy 8/10/79 All Holders of Reactor flRC '.icensed Individuals OLs and cps and Production Licensees with Licensed Operators 79-21 Transportation and Commercial 9/7/79 All power and research Burial of Radioactive Material reactors with OL's 79-22 Qualification of Control 9/14/79 All power reactor Systems facilities with operating licenses and construction permits.
79-23 Energency Diesel Generator 9/26/79 All Power facilities Lube Oil Coolers holding OLs and cps 1181 039