ML19256G265
| ML19256G265 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/13/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Arenal A SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| NUDOCS 7912280625 | |
| Download: ML19256G265 (1) | |
Text
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UNITED STATES g
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NUCLEAR REGULATORY COMMISSION g,..
nc REGION V o,
g 1990 N. CALIFORNIA BOULEVARD d
SUITE 202, WALNUT CREEK PLAZA WALNUT CREEK, CALIFORNIA 94596 December 13, 1979 Docket Nos. 50-206 50-361 50-362 b
Southern California Edison Company P. O. Box 800 2244 Walnut Grove Avenue Rosemead, California 91770 Attention: Mr. A. Arenal, Vice President Advanced Engineering Gentlemen:
This Information flotice is provided as an early notification of a possibly significant matter.
It is expected that recipients will review the information for possible applicability to their facilities.
tio specific action or response is requested at this time.
If further i1RC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate flRC Regional Office.
Sincerely, in w It R. H. kngelken Director
Enclosure:
IE Information flotice No. 79-31 cc w/ enclosure:
J.14. Curran, SCE J. T. Head, SCE J. H. Drake, SCE 1650 074 79122 80 [2
SSINS: 6870 Accession No.:
UNITED STATES 7910250507 NUCLEAR REGULATORY C0!?IISSION OFFICE OF INSPECTION AND ENFORCEf1ENT WASHINGT0ft, D.C.
20555 December 13, 1979 IE Information Notice No. 79-31 USE OF INCORRECT Af1PLIFIED RESPONSE SPECTRA (ARS)
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Description of Circumstances:
Recently, the NRC was informed that, durina a review of valve weights in conjunction with the as-built review for IE Bulletin 79-1a at North Anna Unit 1, it was discovered that incorrect amplified response spectra (ARS) had been used as input to the analyses of some piping on both units 1 and 2.
The reanalyses are being performed by Stone & Webster (S&W), the Architect Enaineer for the Virginia Electric & Power Company's facilities.
Similarly, Public Service Company of New Hanoshire informed the NRC that the wrong ARS were used for the design of some containment supports at their Seabrook units. The Architect Engineer for these plants is United Engineers & Constructors (UE&C).
The NRC is currently cursuing this issue in detail with S&W and UE&C to determine the extent of the problem and the generic implications for other facilities.
This Information flotice is provided as an early notification of a possible significant matter.
It is expected that recipients will review the inforna-tion for possible applicability to their facilities. Specific action has been requested by IE Bulletin 79-14. This bulletin requires that input to seismic analyses of pipina, which includes the use of the correct ARS, be verified against the as-built condition of the plant. No specific actions are requested in response to this Information Notice.
If NRC evaluations so indicate, further licensee actions may be requested or required.
If you have any ques-tions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
flo written response to this IE Information flotice is required.
Enclosure:
List of IE Information Notices Recently Issued 1650 075
IE Information flotice No. 79-31 Enclosure December 13 1979 RECENTLY ISSUED IE It!FORiiATION NOTICES Information Subject Date Issued To Notice ho.
Issued 79-30 Reportinq of Defect; and 12/6/79 All power reactor facilities Noncompliances,10 CFR holding OLs and cps and Part 21 vendors inspec,ted by LCVIP 79-29 Loss of flonSafety-Related 11/16/79 All power reactor facilities Reactor Coolant System holdino OLs or cps Instrumentation Curing Operation 79-28 Overloadina of Structural 11/16/79 All power reactor facilities Elements Due to Pipe Support with an OL or CP Loads 79-27 Steam Generator Tube 11/16/79 All power reactor facilities Ruptures At Two PWR holding OLs and cps Facilities79-12A Attempted Damage To flew 11/9/79 All Fuel Facilities, Fuel Assemblies research reactors, and power reactors with an OL or CP 79-26 Breach of Containment 11/5/79 All power reactor facilities Intearity holdina Ols and cps 79-25 Reactor Trips At Turkey 10/1/79 All power facilities with Point Units 3 And 4 an OL or a CP 79-24 Overpressurization Of 10/1/79 All power reactor facilities Containment Of A PWR Plant with a CP After A fiain Steam Line Break 79-23 Emergency Diesel Generator 9/26/79 All power n actor Lube Oil Coolers facilities noldina OLs and cps 79-22 Qualification of Control 9/14/79 All power reactor Systems facilities with operating licenses and construction permits.
79-21 Transportation and Comnercial 9/7/79 All power and research Burial of Radioactive flaterial reactors with Ols 1650 076