ML20079S272

Answer to Sixth Set of Interrogatories on Qa/Welding Contention

ML20079S272
Person / Time
Site:	Limerick
Issue date:	01/25/1984
From:	Boyer V PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	AIR AND WATER POLLUTION PATROL
Shared Package
ML20079S237	List: ML20079S233 ML20079S272 ML20079S285 ML20079S290
References
NUDOCS 8402030270
Download: ML20079S272 (7)

Text

.. - ___________________________ _ _________-__

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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION e

In the Matter of

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Philadelphia Electric Company

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Docket Nos. 50-352

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50-353 (Limerick Generating Station

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Units 1 and 2)

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APPLICANT *S'ANSEERS TO INTERVENOR-AWPPSS SIITH SET OF INTERROGATORIES ON QA/ WELDING CONTENTION i

f DISCOVERY 20 JANUARY 25, 1984 4

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o Interrocatory No. 1 Is there any etninican steel ecfoty-roletsd piping uced et Limerick?

Answer s

Yes.

j Participants in Preparation of Answer V.

S. Boyer, Senior Vice President - Nuclear Power Philadelphia Electric Company 2301 Market Street l

Philadelphia, PA 19101 l

I J. M. Corcoran Quality Assurance Field Branch Head Philadelphia Electric Company 2301 Market Street l

Philadelphia, PA 19101

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P. A. Tutton Engineering S Eesearch l

Senior Engineer Philadelphia Electric Company i

2301 Market Street Philadelphia, PA 19101 2

Interrocatory No. 2 Das any stainless steel piping used, or to be used at Limerick's boiling water reactor, manufactured by the same manufacturer as supplied to the Vermont Yankee nuclear plant?

Answer Applicant has been unable to determine the manufacturer of o

stainless steel pipe used at Vermont Yankee. Intergranular stress corrosion cracking (IGSCC) is related to the type of stainless steel used and the service in which that stainless steel is used.

There has been no correlation cade between IGSCC and specific pipe manufacturers.

Participants in Preparation of Answer V. S. Boyer, Senior Vice President - Nuclear Power Philadelphia Electric Company 2301 Market Street Philadelphia, P A 19101 P.

A. Tutton Engineering & Research Senior Engineer Philadelphia Electric Company 2301 Market Street Philadelphia, PA 19101 3

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o Interrogatory No._3 Whether or not fron the sane nanuf acturer, would such piping be equally susceptable to intergranular stress corrosion as occurred at Yermont Yankee?

Answer No.

The type of stainless steel that has been af fected by intergranular stress corrosion cracking (IGSCC) in operating BWR's is high carbon content type 304 and in some cases high carbon content type 316.

The entire recirculation system and essentially all of the IGSCC susceptible portions of the other prasary pressura boundary piping at Limerick have been replaced with IGSCC resistant low carbon content stainless steel.

Participants in Preparation of Answer V. S. Boyer, Senior Vice President - Nuclear Power Philadelphia Electric Company 2301 Market Street Philadelphia, PA 19101 P. A. Tutton Engineering & Research Senior Engineer Philadelphia Electric Company 2301 Market Street Philadelphia, PA 19101 4

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o Interrocatory No. 4 Provide (rccarde) Quality Accuranco Rccords of heat-affseted zones of welds made on all safety-related stainless steel piping to insure that Limerick atainless steel does not have the same intergranular stress corrosion or other adverse effect.

Answer i

The responsible design organization specifies or approves stainless steel materials, f abrication and installation procedures and applications to prevent IGSCC.

Quality Assurance records provide documented verification that welding on safety-related stainless steel materials are performed in accordance with these engineering requirements.

In as auch as IGSCC develops during operation, non-destructive testing at the construction phase would not indicate the presence of IGSCC.

Quality. Assurance logs, including those for Quality Control Inspection Records of safety-related piping installations, were previously provided.

Participants in Preparation of Answer V.S. Boyer, Senior Vice President - Nuclear Power Philadelphia Electric Company 2301 Market Street Philadelphia, PA 19101 b

J. M. Corcoran Quality Assurance Field Branch Head Philadelphia Electric Company 2301 Market Street Philadelphia, PA 19101 5

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Intrrrenntory No. 5 Whzt t0at cathodology and/or quality aseuranco actions cora

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used in checking possibility of stainless steel piping defects from welding or otherwise?

Answer Stainless steel piping welds and adjacent base metal are examined as required by the governing engineering specification which is based upon the applicable code.

Examination test I

methods used as applicable are:

Liquid Penetrant Examinations, Ultrasonic Examinations, Radiography, and Visual Examinations.

Participants in Preparntion of Answer V. S. Boyer, Senior Vice President - Nuclear Power Philadelphia Electric Company 2301 Market Street Philadelphia, PA 19101 J.

M. Corcoran Quality Assurance Field Branch Head Philadelphia Electric Company 2301 Market Street Philadelphia, PA 19101 P. A. Tutton Engineering & Research Senior Engineer Philadelphia Electric Company 2301 Market Street Philadelphia, PA 19101 6

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N-COMMONWEALTH OF PENNSYLVANIA ss.

COUNTY OF PHILADELPHIA I

V. S. Boyer, being first sworn, deposes and states:

That he is Senior Vice President of Philadelphia Electric Company, the Applicant' herein; that he has read the foregoing Applicant's Answers to Intervenor AWPP's Sixth Set of Interrogatories on OA/ Welding and knows the contents thereof; and that the statements and matters set forth therein are 'true and correct to the best of his' knowledge, informattor, and belief.

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P Senior Vice PresVdent Subscribed and sworn to before me this 2 6 day of January, 1984.

Jonw b.%

Nottary Public PATRICIA D. SCHOLL Notary Publ c, PNadcipl.ia. Phdi.det;his Co.

My Coimnission bpue4 fei,ns.ry 10, IS3G

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