ML19211C086
| ML19211C086 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 12/13/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Millen C PUBLIC SERVICE CO. OF COLORADO |
| References | |
| NUDOCS 8001100067 | |
| Download: ML19211C086 (1) | |
Text
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NSIC December 13, 1979 Docket No. 50-267 Public Service Company of Colorado AITN:
Mr. C. K. Millen Senior Vice President P. O. Box 840 Denver, Colorado 80201 Gentle =en:
This IE Information Notice 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.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensed actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
3 Sincerely, Karl V. Seyfri Director
Enclosures:
1.
IE Information Notice No. 79-31 2.
List of IE Information Notices Recently Issued cc:
D. W. Warembourg, Nuclear Production Manager 1739 103 Fort St. Vrain Nuclear Station P. O. Box 368 Platteville, Colorado 80651 L. Brey, Manager, Quality Assurance 8001100 06 4
SSINS: 6870 Accession No.:
UNITED STATES 7910250507 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT T'
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.=.5-v ev IE Information Notice No. 79-31 Date:
December 13, 1979 Page 1 of 1 USE OF INCORRECT AMPLIFIED RESPONSE SPECTRA (ARS)
Description of Circumstances:
Recently, the NRC was informed that, during a review of valve weights in conjunction with the as-built review for IE Bulletin 79-14 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 Engineer for the Virginia Electric & Power Company's facilities.
Similarly, Public Service Company of New Hampshire 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 pursuing 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 Notice is provided as an early notification of a possible significant matter.
It is expected that recipients will review the informa-tion for possible e,plicability to their facilities.
Specific action has been requested by IE Bulletin 79-14.
This bulletin requires that input to seismic analyses of piping, 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.
No written response to this IE Information Notice is required.
1739 104 9
IE Information Notice No. 79-31 December 13, 1979 LISTING OF RECENTLY ISSUED IE INFOR&\\ TION NOTICES Info rmation Subject Date Issued To Notice No.
Issued 79-26 Breach of Containment 11/5/79 All power reactor Integrity holding Operating License (OL) and Construction Permits (cps)79-12A Attempted Damage to New 11/9/79 All Fuel Facilities, Fuel Assemblies research reactors, and power reactors with an Operating License (OL) or Construction Permit (CP) 79-27 Steam Generator Tube 11/16/79 All power reactor facilities Ruptures at Two PWR holding Operating Licenses Facilities (OLs) and Construction Permits (cps) 79-28 Overloading of Structural 11/16/79 All power reactor facilities Elements Due to Pipe Support with an Operating License (OL) or Construction Permit (CP) 79-29 Loss of NonSafety-Related 11/16/79 All power reactor facilities Reactor Coolant System holding Operating Licenses Instrumentation During (OLs) or Construction Operating Permits (cps) 79-30 Reporting of Defects and 12/6/79 All power reactor Noncompliances, 10 CFR facilities holding Part 21 Operating Licenses (OLs) and Construction Permits (cps) and vendors inspected by LCVIP Enclosure 1739 105
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