ML20042A870

Updated LER 81-002/01X-6:on 810927,error Discovered in Diagram Used to Locate Vertical Seismic Floor Response Spectra for Equipment & Sys Seismic Design.Caused by Erroneous Use of Unit 2 Diagram for Unit 1

ML20042A870
Person / Time
Site:	Diablo Canyon
Issue date:	03/16/1982
From:	Baciarelli R PACIFIC GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20042A860	List: ML20042A859 ML20042A870
References
LER-81-002-01X, LER-81-2-1X, NUDOCS 8203240221
Download: ML20042A870 (1)

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" UPDATE REPORT - PREVIOUS REPORT DATE l-25-82"

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EVENT DESCRI, TION AND Pros *BLE CON 1tOUENCts Oto .

Prior to start of fuel loading,' Company Ensineers, while in the process ,

,of various design activities, discovered an error in a diagram used to i

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g pq i ocate l Vertical Seismic Floor Response (VSIR) spectra for use in plant i gg3-) i equipment and systems seismic design. The potential effect of thif i le n i t error is that some designs may not be in compliance with Hosgri seismic i e , i d esign criteria. Unit 2 is similarly affected. This report is submitted i

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CAU$( DESCRIPTIO.* AND CO.RE C ravt ACTIONS m1 Diagram for Unit 2 was erroneously used for Unit 1 annulus area. i PTrl I Incorrect diagram was used for Unit i VSFR spectra. Affected systems are i m i eing b reviewed and modifications, as necessary, performed. The information i

PT'n I related to tais LER will be updated by each of the PGandE semi-monthly ,

i . 1 status reports submitted to the Staff as a requirement of Order CLI 81-30.,

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=Aot o..Ar,Aar. R.M. BACIARELLI ,,.oy, (415) 541-6515 8203240221 820316 PDR ADOCK 05000275 S PDR