ML20206G385

SER Supporting Employee Concern Element Rept Mc 40512-SQN, Containment Vessel Liner

ML20206G385
Person / Time
Site:	Sequoyah
Issue date:	11/04/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
To:
Shared Package
ML20206G037	List: ML20206G034 ML20206G298 ML20206G302 ML20206G306 ML20206G315 ML20206G319 ML20206G325 ML20206G330 ML20206G337 ML20206G344 ML20206G348 ML20206G352 ML20206G358 ML20206G363 ML20206G366 ML20206G370 ML20206G374 ML20206G380 ML20206G385 ML20206G392 ML20206G396 ML20206G404 ML20206G408 ML20206G410 ML20206G416 ML20206G419 ML20206G426 ML20206G429 ML20206G435 ML20206G438 ML20206G447 ML20206G453 ML20206G457 ML20206G459 ML20206G462 ML20206G466 ML20206G472 ML20206G480 ML20206G486 ML20206G497 ML20206G502 ML20206G509 ML20206G519 ML20206G524 ML20206G529 ML20206G534 ML20206G539 ML20206G543 ML20206G550 ML20206G559 ... further results
References
NUDOCS 8811220257
Download: ML20206G385 (2)

Text

_ _ __ - __ - _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ - - _ _ _ - _ _ _ - _ - - _ - _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _

g=* $8 % ,

d i, UNITED STATES i' '

O. NUCLEAR REGULATORY COMMISSION h ' ".. , '

it WASHINGTON. D. C. 205$5

• ~M&fl 6

SAFETY EVALUATION .T ORT BY THE OFFICE OF SPECIAL PROJECTS i

4 EMPLOYEE CONCERN ELEMEllT REPORT NC 40512-SON, "C0fiTAlhhElli VESSEL Lif4ER" TEf;NESSEE VALLEY AUTHORITY ,

SECUOYAH hUCLEAR POWER PLANT UNITS 1 & ? [

t c

DOCKET tiOS. 50-327 Af40 50-328

SUBJECT:

Ca tegcry : Materials control (40000)

Subcategory : MaterialIdentification(4C500) 1 Eletent: Contaiorent Vessel Flate (40512)

Tre basis fer Element Report MC 40512-SQN, Revision 4, dated February 24, 1987 ,

.. Sequojah-specific ccr.cern XX-65-120-003 which states. ,

"Sequoya h: heat numbers had been placed on approximately five plates on the contairarent vessel when it was ciscovered that there were no heat nsmbers on these plates. This was done without Quality Control's  ;

knowledge and violated the QA procedure. Cl has no further information.

t Construction Departrent concers'.* l 7his concern was evaluated by TVA to be potentially nuclear safety-related and  !

safety significant, t t

11. SUMFARY OF ISSUE The problem as defined by TVA was that, heat numbers were placed on approx-raately five p!etes on the containtrent vestel without the knowledge of Quality Lontrol. The heat nun.bers were added when it was ciscovered that there were l no heat numbers on the plates. l

!!!. EVALUATION The review by the Erployee Concern Task Group (ECTG) evaluator of the NSRS report indicated that the en.ployee concern was not substartiated. The records incicated that the heat nur.bers for the five plate attached to the centainment  !

vessei liner were checked anc cocumented by QC inspectors ano thtt there were l no requirementh to add heat nue.bers to the plate. The review of Workplan 8434 end the inspection recorcs indicated that the naterial was signed-off for ,

material serificaticn and approved by the cognizant engireer, j The ECTG revi n of the Certified Material Test Reports (CMTRs) indicated that  :

reat nu u rs 5:D2:( u e 42Ets ! were ASTn C 16 Grade 7C as specifice.

r c ever, teat rg er 74e:-J which was useu in the Fat,rication ef cr.e of the {

plates was founc te te A5Til A3C ard net the ASiti A516 gradt. 70 as specifieo. [

i 8811220257 881144 PDR ADOCK 05000327  ;

P PDC 1

4 . . i l

. l l

1 l -

Ti A Element Report 40512-SQN concluded that there were no requirements to  !

1 riace or verify heat nur.bers on the plates at fabrication or installatten.

The eierent report also concludes that one of the five plates attached to the  ;

containment liner was not AS1h A516 Grade 60 or 70 as specified, but ASTM A36. l The element report state that this plate was support pad mark number 125, i

The eier.ent report indicates that the following corrective actions will be taken:

1. Metallurgical test will be performed on the support pad in question to det' rmine the type and grade of the r.cterial.

I 2. Remove arid replace with the cor, rect material, if incorrect.

The corrective actions were complated on July 28, 1988 and the RIMS documenta-2 tien nurter is T25850728942.

IV. CONCLUSION i

i The ARC staff concludes that TVA's investigation of the concern was adequate and their resolution of the concern, as described in Element Report MC-40512-SON Revision 4 is acceptable.

II i

l