Information Notice 1979-31, Use of Incorrect Amplified Response Spectra

Use of Incorrect Amplified Response Spectra

ML031180198
Person / Time
Site:	05000000
Issue date:	12/13/1979
From:	NRC/OI
To:
References
IN-79-031, NUDOCS 7910250507
Download: ML031180198 (2)

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Accession No.:

UNITED STATES 7910250507 NUCLEAR REGULATORY COMMISSION

OFFICE OF INSPECTION AND ENFORCEMENT

WASHINGTON, D.C. 20555 December 13, 1979 IE Information Notice No. 79-31 USE OF INCORRECT AMPLIFIED RESPONSE SPECTRA (ARS)

Description of Circumstances

Recently, the NRC was informed that, durinq 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 Virqinia 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 applicability 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.

Enclosure:

List of IE Information

Notices Recently Issued

Enclosure

IE Information Notice No. 79-31

December 13, 1979

RECENTLY ISSUED

IE INFORMATION NOTICES

Information Subject Date Issued To

Notice No. Issued

79-30 Renortinq of Defects and 12/6/79 All power reactor facilities

Noncompliances, 10 CFR holding OLs and CPs and

Part 21 vendors inspected by LCVIP

79-29 Loss of NonSafety-Related 11/16/79 All power reactor facilities

Reactor Coolant System holdinc 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 PWIR 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 1/5/79 All power reactor facilities

Inteqrity holding OLs and CPs

79-25 Reactor Trips At Turkey 0/1/79 All power facilities with

Point Units 3 And 4 an OL or a CP

79-24 Overpressurization Of .0/1/79 All power reactor facilities

Containment Of A PWR Plant with a CP

After A Main Steam Line

Break

79-23 Emergency Diesel Generator 9/26/79 All power reactor

Lube Oil Coolers facilities holding OLs

and CPs

79-22 Oualification of Control  ?/14/79 All Power reactor

Systems facilities with

operating licenses

and construction permits.

79-21 Transportation and Commercial 9/7/79 All power and research

Burial of Radioactive Material reactors with OLs