ML20206G396

SER Supporting Util Investigation of Employee Concerns as Described in Element Rept 308.03

ML20206G396
Person / Time
Site:	Sequoyah
Issue date:	11/04/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
To:
Shared Package
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References
NUDOCS 8811220261
Download: ML20206G396 (3)

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UNITED STATES s

[ ' '.c. 'i NUCLEAR REGULATORY COMMISSION I

W ASHINGTON, D. C,20S$6

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t SAFETY EVALUATION BY THE OFFICE OF SpECIAl. PROJECTS FOR EFPLOYEE CONCERNS SEQUQYAH NUCLEAR PLANT, UNITS 1 AND 2 EPPLOYEE CONCERNS XX-85-017-003. AND -004 DOCKET N05. 50-237. AND 50-238 l

1.

SUBJECT Categcry:

Operations l

Subca tegory:

Maintenance i

Element:

Corrective haintenance Cer.cerns :

xx-05-071-003: The replacerent rain feedwater heaters f

were instdlled without postweld teat treatment, as required.

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XX-ES-971-004: The replacement main feedwater heaters were installed such that cold-springing of connected j

piping had occurred.

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f SUMARY OF ISSUES t

f 1.

The replacement riain feedwater heaters were installed to the connected pipir.g without post weld beat treatment and this was incorrect as the original heaters required post weld heat treatment.

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2.

The dimensions of the replacement heaters were different f ron the original heaters and cold-springing of the pipe nay have occurred j

when the replacement heaters were installed.

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Ill.

EVAL L'ATION The main feedwater heaters are not safety-related equipment.

However, this f

item was reviewed for overall code compliance, f

hot all of the piping connections to the main feedwater heaters were post weld f

heat treated, but those that would be recuired to be so treated by the appli-catie fiele f abrication code, USAS B31.7-1969 as des,-ibed in the FSAR, tecause i

of wall thickness limits, were post weld heat treated as evicenced in the TVA work plan.'ackages for the installation of the re;1acement heaters. TVA inter-views with the two engineers who approved this portion of the work and a pipe-fitter foreman who oversaw the wora revealed no evidence of excessive force j

having been applied to the piping.

The applicable field fabricatior, code, R 1.7, c;es accress cold sprin;ing, ard states " Cold springirg provides a j

l teneficial effect ir. Assisting a system to attain its ecst favorable position j

ccrer".

Cold springing is ar'alyzed cr.ly when it it used to reduce piping j

rtaction forces in design.

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IV. @ N!!SION The IEC.taff believes that the TVA investigation Of ine employee cer.cerns aas adequate, ar.d their resolution of the suocerns as described in Elemnt heport 308.03 is acceptable.

Principal Centributor:

D. E. Smith I

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S AFETY EVAL'.".TIONS OF '.NE I

TENNESSEE VALLEY AUTM*' TTY Ef@LOYEE C0ftCEPNS SPECI AL PROGRAM ELEFENT REPORTS f

i TOP THE SEQUOYAH NUCLEAR PLANT L

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