ML20206G410

SER Supporting Employee Concern Element Rept Co 10501, Caulking as Related to Const

ML20206G410
Person / Time
Site:	Sequoyah
Issue date:	11/04/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
To:
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References
NUDOCS 8811220269
Download: ML20206G410 (2)

Text

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c 4"g.* a m 's UNITED STATES l

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i NUCLE AR REGULATORY COMMISSION W ASHINGTON. D. C. 20SSS l.

SAFETY EVALUATION REPORT BY THE OFFICE OF SPECIAL PROJECTS l

l EfGLOYEE CONCERN ELEMENT REPORT CO 10501 l

f "CAULKING AS RELATED TO CONSTRUCTION" J

TEhNESSEE VALLEY AUTHORITY f

SEQUOYAH NUCLEAR PUWER PLANT UNITS 1 & 2 LOCKET N05. 50-327 AND 50-328 f

I 1.

Sutdect Cattgery:

Construction (10000) i Sub category:

Deterioration of Fernanent fnilities (10500) l Element:

CaulkingasRelatedtoConstruction(10501)

Enployee Concern:

IN-85-231-003 The basis for Element Report C010501-SQN, Rev. 1 dated October 9, 1566, is Wetts Bar Ertployee Concern Ih-65-231-003 which states:

In the Etn Diesel Generator Building, the caulking (nova caulk) in the missile shields have turnt. loose anti bubbled up. This caulking

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was poured last winter in the 5th diesel generator building.

Constructinn department concern. C/I coulo not provido any additional detatis/ specifics.

This concern was evaluated by the Watts Bar Nuclear Plant (WEN) Erployee 1

Concerns Tast Group (ECTG) ano determined to not be r.uclear safety i

relatedanopotentiallygenerictoSequoyahNuclearPlant(SNP).

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11. Sun-arv of Issue i

The problem as defined by TVA is that the caulking in the missile shields l

used in the Fifth Diesel Generator Building was exposed to terperature l

changes and reisture.

This caused the caulking to separate from the cercrete and tsecorte loose.

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l es112 $$Ich $ bb f i

FOR f

III. Evaluation TVA perfornec the following inspections / reviews:

A.

The review of WEN ECGT Elenent report, Caulking'(C010501), revealed the concern was f actual at WBN but was not safety-related. This review also revealed that WBN Mechanical Maintenance will issue a Field Charge Request (FCR) to modify the note on TVA J

crawing 10W331-16 to elimir:ote the requirement to fill the lif ting eye recess with caulk.

r b.

Inspection of the $(h Fifth Diesel Building revealed the top nissile shielJ to have two recesses approxirately tiight inches, ceep to accorrodate lif tirg eyes. A review of TVA crawirg 10W33-16. Rev. 2 showed that eight inches of polysulfide caulkir.g would fill the recesses of the top shield to seal out w;ter.

Constructicn of the SQN Fifth Diesel Building is not corpleted. Therefore, the lifting eye recesses do not have caulkir.g 1r. then at this tite.

IV.

Cerclusion The hFC staff conclodes that TVA's investigation and resolution of the concerr s.as adequate and no further action is required by hRC.

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