ML19296A780

Response to Mi Lewis Interrogatories.Contains Info Re Gaseous Radwaste Sys,Potential Pathways for Radioactive Releases,Pipe & Weld Cracking in Vent Header & Auixiliary Bldg Filters.Affidavit & Certificate of Svc Encl

ML19296A780
Person / Time
Site:	Three Mile Island
Issue date:	01/28/1980
From:	Zahler R METROPOLITAN EDISON CO., SHAW, PITTMAN, POTTS & TROWBRIDGE
To:	Lewis M AFFILIATION NOT ASSIGNED
Shared Package
ML19296A773	List: ML19296A772 ML19296A780
References
NUDOCS 8002190030
Download: ML19296A780 (12)

Text

)

January 28, 1980 .

UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD In the Matter of ) .

)

METROPOLITAN EDISON COMPANY ) Docket No. 50-289

) (Restart)

(Three Mile Island Nuclear )

Station, Unit No. 1) )

LICENSEE'S RESPONSE TO INTERROGATORIES OF MARVIN I. LEWIS In responding to the interrogatories propounded by Marvin I. Lewis, Licensee has extracted a simple cuestion from the commentary accompanying the interrogatories. Every effort has been made to ask the precise question posed by Mr. Lewis' interrogatories.

In addition to the information provided in these inter-rogatory responses, Licensee notes that further information on the TMI-l gaseous radwaste system and filters can be found in the following documents: Final Environmental Statement Related to Operation of Three Mile Island Nuclear Station, Units 1 and 2 at S III-D-2-a (December 1972) (a copy of which was attached to Licensee's First Set of Interrogatories to Marvin I. Lewis);

TMI-l Restart Report at S 7.3.1.2; and Status Report on the Evaluation of Licensee's Compliance with the NRC Order Dated August 9, 1979 at pp. C5-1 through C5-6 (January 11, 1980).

a 002100 O}O

Interrogatory No. SP-1 Which accident scenario most aptly and accurately de-scribes the accident at TMI #2 on 3/28/79?

Response

The accident at TMI-2 is most aptly and accurately described in Preliminary Annotated Sequence of Events, March 28, 1979 (Revision 1, July 16, 1979). This document was pre-pared by the GPU Accident Assessment Group.

Interrogatory No. SP-2 Using the scenario in SP-1 above, what particular items, materials, filters or what-have-you failed (so as] to allow radioactive contamination to escape?

Response

There were multiple potential pathways for the release of radioactivity. These potential pathways are described in:

Nuclear Safety Analysis Center - EPRI, Analysis of Three Mile Island - Unit 2 Accident (NSAC-1, July 1979) and President's Commission on the Accident at Three Mile Island, Technical Staff Analysis Report on Transport of Radioactivity from the TMI-2 Core to the Environs (October 31, 1979).

Interrogatory No. SP-3 Please give a description or accounting over time e.f what radioactive isotopes escaped at TMI #2 and the causes.

Response

A description of the releases during the TMI-2 acci-dent can be found in Assesslaent of Offsite Radiation Doses From the Three Mile Island Unit 2 Accident, TDR-TMI-ll6 (Revision 0, July 31, 1979). The potential pathways for release are described in the references cited in the response to Interrogatory No.

SP-2 and in TDR-TMI-ll6.

Interrogatory No. SP-4

[Was] the vent header actually cracked as described in the Kemeny Commission Report, page 103?

Response

No evidence of cracking of any piping or welds in the vent header has been identified. Furthermore, Licensee has been unable to locate any reference on page 103 of the Report of the President's Commission on the Accident at Three Mile Island to a

" cracked" vent header. (Note: the pagination in the glossy covered version of the Report which is available from the GPO differs from that in the version of the Report released on October 31, 1979. Licensee has reviewed page 103 of both ver-sions.)

Interrogatory No. SP-5 Please put in or supply a schematic or working draw-ing of where the vent header is.

Response

A schematic diagram depicting the vent header is in-cluded as Interrogatory No. SP-5, Attachment A.

Interrogatory No. SP-6 .

[ Explain) why there were cracks in the vent header and why they were not fi::ed .

Response .

See response to Interrogatory No. SP-4.

Interrogatory No.'SP-7 If the vent header also exists on TMI #1, is it cracked? If so will it be fixed before restart? How? Put in maintenance reports or job tickets or name of artisan who did work.

Response

Licensee has no knowledge of any cracks in the TMI-l vent header.

Interrogatory No. SP-8 Is there a program to assure no repeat of cracking in the vent header at TMI #1? Is it long or short term? Where is it referred to in the Lessons Learned [ Reports]?

Response

See responses to Interrogatory Nos. SP-4 and SP-7.

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Interrogatory No. SP-9 Did the filters in the auxiliary building at TMI #2 stop working because they got wet, or did the filters in TMI

1. 2 stop working because of some other reason, or did the filters in TMI # 2 work fine? .

~

Response

The filters in the TMI-2 auxiliary building continued to work until they were replaced. . A discussion of filter per-formance is given in President's Commission on the Accident at Three Mile Island, Technical Staff Analysis Report on Iodine Filter Performance (October 31, 1979).

Interrogatory No. SP-10 Which scenario most aptly and correctly describes what happened in the auxiliary building of TMI #2 with par-ticular emphasis on how the filters got wet?

Response

Descriptions of potential pathways for the release of radioactivity are given in the references cited in response to Interrogatory Nos. SP-2 and SP-3. The performance of the filters is given in the reference cited in response to Interrogatory No.

SP-9.

Interrogatory No. SP-ll How much humidity can the filters * *

• withstand before losing effectiveness as a filter? Plot a well-defined loss of filtering effectiveness against moisture in the air

for various rates of volumes of air passing [through the]

filter.

Response

A graph of filter effectiveness vs. moisture is'given in Interrogatory No. SP-ll, Attachment A.

Interrogatory No. SP-12a Put in a schematic of..[the] auxiliary building show-ing where all filters are, which got wet [and] which stopped working.

Response

A drawing showing the location of the THI-2 auxiliary building filters is given in Interrogatory No. SP-12a, Attach-ment A. The six filters are outlined and numbered.

Interrogatory No. SP-12b Which filters were reduced in effectiveness by what cause?

Response

See response to Interrogatory No. SP-9.

, Interrogatory No. SP-13 Describe the filters in the auxiliary building at TMI #1 which are in a similar position or use to those filters which failed in TMI #2.

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Response

No filters at TMI-2 failed.

Interrogatory No. SP-14 Describe what actions have been taken so,far and will be taken to eliminate the same filter problem in TMI #1 as happened in TMI #2.

Response .

As part of normal TMI-l plant operations Licensee ex-pects to comply with the maintenance and testing specifications of USNRC Regulatory Guide 1.52, " Design, Testing, and Mainten-ance Criteria for Post Accident Engineered-Safety-Feature At-mosphere Cleanup Systen Air Filtration and Absorption Units of Light-Water-Cooled Nuclear Power Plants" (Revision 2, March 1978).

Interrogatory No. SP-15 Have the filters been analyzed for how they will per-form in the scenarios which have been accepted from other inter-venors [i.e., Mr. Sholly's Contention No. 17]?

Response

No.

Interrogatory No. SP-16 Using the various scenarios in SP-15, what unexpected, unusual, or previously unanalyzed radioactive contamination or

e isotope may be generated -- and in what volure and curies --

which may or may not have an adverse effect upon the usefulness of the filters in the auxiliary building?

Response

Licensee has not performed the analysis described in this interrogatory

. Respectfully submitted, SHAW, PITTMAN, POTTS & TROWBRIDGE By:

)

RobertE}Zahler Dated: January 28, 1980

UNITED STATES OF AMERICA .

NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD In the Matter of )

)

METROPOLITAN EDISON COMPANY ) Docket No. 50-289

) (Restart) .

(Three Mile Island Nuclear )

S ta tion , Unit No. 1) ) .

AFFIDAVIT OF ROBERT W. KEATEN District of Columbia, ss:

ROBERT W. KEATEN, being duly sworn according to law, deposes and says that he is the Manager of Systems Engineering of General Public Utilities Service Corporation; that the information contained in Licensee's Responses to the following Interrogatories are true and correct to the best of his knowledge and belief: Marvin I Lewis Interrogatory Nos. SP-1 through SP-16.

/

fl d v Robert W. Keaten Manager of Systems Engineering Sworn to and subscribed before me this #f f' day

, of January, 1980

/t n ';i: R 'yli,!ft,

?

Notary Public My!Cbmmission Expires .

January 28, 1980 UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD In the Matter of )

)

METROPOLITAN EDISON COMPANY ) Docket No. 50-289

) (Restart)

(Three Mile Island Nuclear )

Station, Unit No. 1) )

CERTIFICATE OF SERVICE I hereby certify that copies of " Licensee's Response to Interrogatories of Marvin I. Lewis", were served upon those persons on the attached Service List by deposit in the United States mail, postage prepaid, this 28th day of January, 1980.

Robert E. K hler Dated: January 28, 1980

UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD

~

In the Matter of )

)

METROPOLITAN EDISON COMPANY ) Docket No. 50-289

) (Restart)

(Three Mile Island Nuclear .

)

Station, Unit No. 1) )

SERVICE LIST Ivan W. Smith, Esquire John A. Levin, Esquire Chaiman Assistant Counsel Atomic Safety and Licensing Pennsylvania Public Utility Cm m'n Board Panel Post Office Box 3265 U.S. Nuclear Regulatory Comnission Harrisburg, Pennsylvania 17120 Washington, D.C. 20555 Karin W. Carter, Escuire Dr. Walter H. Jordan Assistant Attorney General Atomic Safety and Licensing 505 Executive House Board Panel Post Office Box 2357 881 West Outer Drive Harrisburg, Pennsylvania 17120 Oak Ridge, Tennessee 37830 John E. Mirmich Dr. Linda W. Little Chaiman, Dauphin County Board Atcmic Safety and Licensing of Comnissioners Board Panel Dauphin County Courtinise 5000 Hermitage Drive Front and Market Streets Raleigh, North Carolina 27612 Harrisburg, Pennsylvania 17101 James R. Tourtellotte, Esquire Walter W. Cohen, Esquire Office of the Executive Iagal Director Consumr Advocate U. S. Nuclear Pegulatory Ccmnission Office of Consumer Advocate Washington, D.C. 20555 14th Floor, Strawberry Square Harrisburg, Pennsylvania 17127 Docketing and Service Section Office of the Secretary U. S. Nuclear Pegulatory Cmmission Washington, D.C. 20555

Jordan D. Cunningham, Esquire Farin P. Sheldon, Esqture Attorney for Newberry 'Itwnship Attorney for People Pqainst Nuclear T.M.I. Steering Cccmittee Energy 2320 North Second Street Sheldon, Harmon & Weiss Harrisburg, Pennsylvania 17110 1725 Eye Street, N.W., Suite 506

~

Washington, D.C. 20006 Theodore A. Mler, Esquire Widoff Peager Selkowitz & Mler Pobert Q. Pollard Post Office Box 1547 Chesapeake Energy Alliance HarrisburtJ, Pennsylvania 17105 609 Montpelier Street Baltunore, Maryland 21218 Ellyn R. Weiss, Esquire Attorney for the Union of Concerned- Chauncey Kepford Scientists Judith H. Johrsrud Sheldon, Harnon & Weiss Environmental Coalition on Nuclear 1725 Eye Street, N.W., Suite 506 Power Washington, D.C. 20006 433 Orlando Avenue State College, Pennsylvania 16801 Steven C. Sholly 304 South Market Street Parvin I. Iewis Mechanicsburg, Pennsylvania 17055 6504 Bradford Terrace Philadelphia, Pennsylvania 19149 Gail Bradford Holly S. Keck bhrjorie M. Aamodt Iegislation Chairran R. D. 5 Anti-Nuclear Group Pepresenting York Coatesville, Pennsylvania 19320 245 West Philadelphia Street York, Pennsylvania 17404