ML20100A486

Testimony of Tg Broughton Re Incore Thermocouple Readings. Certificate of Svc Encl.Related Correspondence

ML20100A486
Person / Time
Site:	Three Mile Island
Issue date:	11/27/1984
From:	Broughton T GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20100A472	List: ML20100A468 ML20100A486
References
SP, NUDOCS 8412030615
Download: ML20100A486 (9)

Text

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November 27, 1984 UNITED STATES OF AMERICA NUCLEAR REGUIATORY cot 411SSION BEEDRE TIE AktiIC SAFLTI AND LICENSING TARD In the Matter of )

)

METROPOLITAN EDISON CPTMN )

) Docket No. 50-289 SP (Wrce Mile Island Nuclear ) (Restart-Managcznent Romand)

Station, Unit No. 1) )

TESTIMONY OF T. GARY BPOUGInUN My name is T. Gary Broughton. I have previously testified and provided my qualifications in this proceeding.

The Incore thernoccupies (T/Cs) are located at the top of each of the 52 incore nonitoring strings. We radial core locations form a spiral pattern shcun in Figure 1. 20 T/Cs are posit.icned in the fuel assembly upper end fitting about eight inches above the active fuel (Figure 2) and measure local core c.vd.t coolant tenperatures. The incore strings enter the core through guide tubing that penetrates the lower reactor vessel head (Figure 3).

We T/C consists of a chrcrael-alumel junction with a range up to 16500F.

Measurements with reduced accuracy can be obtained up to about 2500 F. which is near the molting reint of the T/C. At the time of the cccident there were no control rocm displays to indicate core temperatures,and incore T/C readings could be displayed only by the process co:rputer upon request. The computer printout was limited to the range of 0*-700*F. Any off-scale readings or nul-functioning T/C, e.g. an open circuit, would print out a series of question marks.

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'Ihe incore T/cs were originally installed in B&W plants to obtain data in special core examinations and test programs to be used for product and code verification efforte (e.g., cmparisons to core thermal-hydraulics code cal-culations). However, they were never intended or required for use during nomal or emergency operation. In fact, in many B&W plants (e.g., 31I-1) the T/Cs were never connected to read-out devices. Even though the T/Cs l

were connected in 911-2, I have been unable to determine that they were ever i

j used in any manner for testing or any other applications before the accident.

'Ihe T/Cs were not considered by plant technical or management personnel I

as part of the regular instrumntation for DII-2, particularly since the T/Cs were not specifically tested or qualified as instruments upon which operators were trained to rely in case of an accident. Furthennore, they were not-i listed in the plant Technical Specifications as part of the required nomal i

operation or post-accident monitoring instrumentation (T.S. Table 3.3-10) .

j A review of available infomation indicated that detailed infomation regarding the incore T/Cs function and design was not included in operator training i materials. Nor were they required for operator actions in any plant operating i or emergency procedures, i

i j Industry evaluations subsequent to the 211-2 accident have concluded I 1

i i that incore themocouple readings can be useful in providing supporting infor-mation to assess post-accident core conditions. This information can be gained frcxn a limited number of fuel assembly T/cs that are representative t

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of core average, symetric, and limiting radial locations. Analysis by B&W i

! has correlated T/C readings to cladding temperature in support of revised 1

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mergency procedures. T/C data can also be used to provide qualitative '

j infomation for engineering assessmnt of:

1 verification whether the core is covered or superheat conditions exist.at top of core

)

• verification of core 4 T (inlet to exit) for core coolant flow or decay heat determinations

l. identification of gross core blockages

identification of moving core debris during steady-state i

flow or after pump starts, etc.

verification of large increases in core bypass flow by -

i camparing T/C average to hot leg RID temperatures i

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It should be noted that because incore T/C readings can only be taken as t representative, and because of uncertainties in correlating exit temperatures 4

to actual core conditions, gross damage assessments such as those described '

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above can only be taken as broadly qualitative estimates rather than specific j quantitative information defining the core condition.

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IMcC2E AM;MtTC21MG ctAMMEL M M ISLAND NUC22AR STATM3M

1 UNITED STATES OF AMERICA NUCLEAR REGUIA'IORY COBMISSION CO 03 u{tyy BEEDRE THE A'IOMIC SAFETY AND LICENSING BOARD

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'd 086' .g In the Matter of S 're . . NI 2S

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METROPOLITAN EDISON 00MPANY )  %-

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) Docket No. 50-289 SP (Three Mile Island Nuclear ) (Restart-Management Remand)

Station, Unit No. 1) ) '

CERTIFICATE OF SERVICE I hereby certify that copies _ of " Notification by Idcensee of Intended Joint Mailgram Exhibit References and Deposition Stipulations", dated November 27, 1984, were served upon those persons on the attached Service List by deposit in the United States mail, postage prepaid, on Novmber 28, 1984, or where indicated by an asterisk (*), by hand delivery on Novsber 27, 1984; and that copies of " Testimony of T. Gary Broughton,"

dated November 27, 1984, were served upon those persons on the attached Service List by deposit in the United States mail, postage prepaid, or where indicated by an asterisk (*), by hand delivery, this 28th day of November, 1984.

David R. Iewis a .

Dated: November 28, 1984

~

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

)

METROPOLITAN EDISON COMPANY ) Occket No. 50-289 SP

) (Restart Remand on Management)

(Three Mile Island Nuclear )

Station, Unit No. 1) )

SERVICE LIST Nunzic J. Palladinc, Chairman U.S. Nuclear Regulatory Cc= mission Administrative Judge Washington, O.C. John H. Buck 20555 Ate =1 Safety & Licensing Appeal A Chc=as M. Rcherts, Cc=missioner Scard U.S. Nuclear Regulatcry Cc= mission U.S. Nuclear Regulatory Cce,miss; Washing cn, O.C. Washington, D.C. 20555 20555 '

James K. Asselstine, Ccmmissioner Administrative Judge U.S. Nuclear Regulatory Cc=missicn Christine N. Kohl Washington , D.C. 20555 Atomic Safety & Licensing Appea.

w. Scard

? Frederick Bern:hal, Cc=missioner U.S. Nuclear Regulatory Cc==:.ss:.

-e U.S. Nuclear Regulatory Cc= mission Washing:ca, D.C. 20555

- Washington, D.C. 20555

• Administrative Judge Lando W. Zeck, Jr., Cc=missioner .. Ivan W. Smith, Chairman U.S. Nuclear Regulatory Cc=missicn Atcmic Safety & Licensing Scard U.S. Nuclear Reculatory Ccemis s :.

Washington, D.C. 20555 Washington, D.C.~ 20555 Administrative Judge ,

Gary J. Edles, Chairman

• Administrative Judge Atomic Safety & Licensing Appeal Shelden J. Wolfe 3 card Atomic Safety & Licensing 3 card U.S. Nuclear Regulatory Cc= mission U.S. Nuclear Regulatory Ccmm ss-j Washingecn, D.C. ~20555 Washington, D.C. 20555 -

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• Administrative Judge Mr. Henry D. Mukill Gustave A. Linenberger, Jr. Vice President Atomic Safety & Licensing Board GPU Nuclear Corporation '

U.S. Nuclear Regulatory Commission P.O. Box 480 Washington, D.C. 20555 Middletcwn, PA 17057 Docketing and Service Section (3)

Office of the Secretary Mr. and Mrs. Norman Aa=cdt R.D. 5 U.S. Nuclear Regulatory Commission Coatesville, PA 19320 Washington , D. C. 20555 Atcmic Safety & Licensing Board

• Ms . Louise Bradford Panel TMI ALERT U.S. Nuclear Regulatory Commission 1011 Green Street Harrisburg, PA 17102 Washington, D.C. 20555 Atomic Safety & Licensing Appeal

• Joanne Doroshow, Esquire Board Panel The Cnristic Institute U.S. Nuclear Regulatory Commission 1324 North Capitol Street Washington , D.C.

Washington, D.C. 20002 20555

• Lynne Bernabel, Esq.

• Jack R. Goldberg, Esq. (4) overnment Acccuntability Office of the Executive Legal ,_$5 $*C*

0 "4 -a c ' * '.

.:ma Connecticut Avenue -

U.S. Nuclear Regulatory Cc==ission Washington, D.C. 20036 Washingten, D.C. 20555

- Ellyn R. Weiss, Esq. -

• Th ma s Y . Au, Esq. Harmen, Weiss & Jordan 2001 S Street, N.W.,

s Of fice of Chief Counsel Washington, Suite 43.]

Cepartment of Environmental D.C. 200C3 3escurces

• Michael F. McBride, Esq.

,03 Executive Ecuse 3

P.O. Sex 2357 LeBoeuf, Lamb, Leiby & MacRae Harrisburg, PA 17120 1333 New Hampshire Avenue, N.W.

Suite 1100 Washingten, D.C.

William T. Russell 20036' Deputy Director, Division of Human Factors Safety Michael W. Maupin, Esq.

Office of NRR Hunten & Williams Mail Stop AR5200 707 East Main Street

., P.O. Box 1535 U.S. Nuclear Regulatory Rich =cnd, VA 23212 Commission Washington, D.C. 20555

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