ML20210F408

Interim Deficiency Rept (CDR 86-00-09) Re Excessive Calibr in Veritrak/Tobar Transmitters.Initially Reported on 860805. Destructive Exam Testing Underway.Nrc Will Be Informed of Status Upon Completion of Tests

ML20210F408
Person / Time
Site:	Seabrook
Issue date:	09/12/1986
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(CDR-86--9), (CDR-86-00-09), SBN-1191, NUDOCS 8609250213
Download: ML20210F408 (3)

Text

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.' *. SEABROOK STATION -'

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J l September 12, 1986 Putse Service of New HampeNro SBN- 1191 '

T.F. Q2.2.2 NEW HAMPSHIRE YANKEE DIVISION United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, PA 19406 Attention: Mr. Richard W. Starostecki, Director Division of Projects and Resident Programs

References:

(a) Const ruction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 ,

(b) Telecon of August 5,1986, J. M. O'Connor and V. W.

Sanchez to D. Haverkamp of Region I Subj ect : Interim 10CFR50.55(e) Repott; Veritrak/Tobar Transmitters; '

(CDR 86-00-09)

Dear Sir:

On August 5,1986 we reported a 10CFR50.55(e) item to Region I

[ Reference (b)]. The following information is provided under the,re-

porting requirements of 10CFR50.55(e). , s Description of Deficiency s

In March of 1986 we reported excessive calibration shif ts in Veritrak Group A transmitters when subjected to changes in;amblint temperature from 80 to 130 degrees F. The transmitters in questica were removed and returned to Westinghouse for analysis and repate.

Westinghouse established a test program to evaluate and correct the cause of the calibration shifts. During the course cf the %estinghouse [

test program, calibration shif ts in excess of specified limits.were discovered when the ambient temperature was varied f rom 60.to 280,  ;

degrees F.

l Analysis of Safety Implication s The transmitters in question are in-containment Qualification s ,

Group A that provide RPS inputs (total of 23 transmitters). The trip setpoints for these instrument channels are based on che maximum calcu-lated error plus margin. Excessive ambient temperature shifts could create a condition where the setpoint could exceed the allowable value limit of the Seabrook Technical Specifications. ,

8609250213 860912 PDR S ADOCK 05000443 PDR.

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Seabrook Station Construction Field Office P.O. Box 700 . Seabrook, NH O3874 h'O m

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United States Nuclear Regulatory Commission SBN- 1191

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Attention Mr. Richard W. Starostecki Page 2 s

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, r . Status of Investigation

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Westinghouse /Tobar has completed the initial testing phase for the f

-Qualification Group A transmitters. This testing effort failed to pro-i~' duce an identifiable root cause for the ambient temperature shif t. As part of the continuing investigation, destructive examination testing

} , is currently underway to identify the root cause f ailure mechanism.

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We will inform Region I when testing has been completed. This letter is being filed pursuant to the interim reporting provisions of 10CFR50.55(e).

Very truly yours, 4

-. 3 ' John DeVincentis

{*' . _ . Director of Engineering i

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. Harmon & W21s3 2001 S. Street, N.W. Nawburyport, MA 01950 Suite 430 Washington, D.C. 20009 Judith H. Mizner Silvergate, Gertner, Baker, Sherwin E. Turk, Esq. Fine, Good & Mizner Office of the Executive Legal Director 88 Broad Street U.S. Nuclear Regulatory Commission Boston, MA 02110 Tenth Floor Washington, DC 20555 Calvin A. Canney City Manager Robert A. Backus, Esquire City Hall 116 Lowell Street 126 Daniel Street P.O. Box 516 Portsmouth, NH 03801 Manchester, NH 03105 Stephen E. Herrill, Esquire Philip Ahrens, Esquire Attorney General Assistant Attorney General George Dana Bisbee, Esquire Department of The Attorney General Assistant Attorney General Statehouse Station #6 Office of the Attorney General Augusta, ME 04333 25 Capitol Street Concord, NH 03301-6397 Mrs. Sandra Gavutis Chairman, Board of Selectmen Mr. J. P. Nadeau RFD 1 - Box 1154 Selectmen's Office Kennsington, NH 03827 10 Central Road Rye, NH 03870 Carol S. Sneider, Esquire Assistant Attorney General Mr. Angie Machiros Department of the Attorney General Chairman of the Board of Selectmen One Ashburton Place,19th Floor Town of Newbury Boston, MA 02108 Newbury, MA 01950 Senator Gordon J. Humphrey Mr. William S. Lord U.S. Senate Board of Selectmen Washington, DC 20510 Town Hall - Friend Street (ATTN: Tom Burack) Amesbury, MA 01913 Richard A. Hampe, Eng. Senator Gordon J. Humphrey Hampe and McNicholas 1 Pillsbury Street 35 Pleasant Street Concord, NH 03301 Concord, NH 03301 (ATTN: Herb Boynton)

Thomas F. Powers, III H. Joseph Flynn, Esquire Town Manager Office of General Counsel Town of Exeter Federal Emergency Management Agency 10 Front Street 500 C Street, SW Exeter, NH 03833 Washington, DC 20472 Brentwood Board of Selectmen Paul McEachern, Esquire RFD Dalton Road Matthew T. Brock , Esquire Brentwood, NH 03833 Shaines & McEachern 25 Maplewood Avenue Gary W. Holmes, Esq. P.O. Box 360 Holmes & Ells Portsmouth, NH 03801 47 Winnacunnet Ro'ad Hampton, NH 03842 Robert Carrigg Town Office Mr. Ed Thomas Atlantic Avenue FEMA Region I North Hampton, NH 03862 442 John W. McCormack PO & Courthouse Boston, MA 02109