ML19262B590
| ML19262B590 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 12/13/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7912280619 | |
| Download: ML19262B590 (1) | |
Text
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UNITED STATES y y y,
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SUITE 202, WALNUT CREEK PLAZA
,,e WALNUT CREEK, CALIFORNI A 94596 December 13, 1979 Docket Nos. 50-133 50-275 50-323 b
Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention: Mr. Philip A. Crane, Jr.
Assistant General Counsel Gentlemen:
This Information riotice 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 licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely, W
'hR.H.En'gelken Director
Enclosure:
IE Information Notice No. 79-31 cc w/ enclosure:
W. Barr, PG&E W. Raymond, PG&E R. Ramsay, PG&E, Diablo Canyon E. Weeks, PG&E, Humboldt Bay J. Worthington, PG&E 1649 359 h
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SSIMS: 6870 Accession No.-
UtlITED STATES 7910250507 NUCLEAR REGULATORY C0!411SSION
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OFFICE OF INSPECTION AND ENFORCEtlEtlT WASHIflGT0fi, D.C.
20555 December 13, 1979 IE Information Notice No. 79-31 USE OF INCORRECT A!!PLIFIED 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 79-14 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 Hanpshire informed the flRC that the wrona 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 Notice 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 pipino, 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 flRC Regional Office.
No written response to this IE Information Notice is required.
Enclosure:
List of IE Information Notices Recently Issued 1649 %D
It"Infornation Notice No. 79-31 Enclosure
. ' December 13, 1979 RECENTLY ISSUED IE INFORMATION NOTICES Infornation Subject Date Issued To Notice No.
Issued 79-30 Reportinq of Defects and 12/6/79 All power reactor facilities Noncompliances,10 CFR holding OLs and cps and Part 21 vendors inspected by LCVIP e
79-29 Loss of NonSafety-Related 11/16/79 All power reactor facilities Reactor Coolant System holdinq 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 New 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 holding 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 CD After A Main Steam Line Break 79-23 Emergency Diesel Generator 9/26/79 All power reactor Lube Oil Coolers facilities holdina OLs and cps 79-22 Qualification of Control 9/14/79 All cower reactor Systems facilities with operating licenses and construction permits.
79-21 Transportation and Connercial 9/7/79 All power and research Burial of Radioactive Material reactors with OLs 1649 361