ML20215M693

Ack Receipt of Informing NRC of long-term Corrective Actions Planned to Resolve Signal Cable Transmission Problems Between Meteorological Bldg & Control Room,Per Insp Rept 50-213/85-08

ML20215M693
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	10/23/1986
From:	Martin T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:	Opeka J CONNECTICUT YANKEE ATOMIC POWER CO.
References
NUDOCS 8611030167
Download: ML20215M693 (2)

See also: IR 05000213/1985008

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DDT 2 31986

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Docket No. 50-213

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Connecticut Yankee Atdmic Power Company

ATTN: Mr. J. F. Opeka

Senior Vice President - Nuclear

Engineering and Operations Group

P. O. Box 270

Hartford, Connecticut 06101

Gentlemen:

Subject: Inspection No. 50-213/85-08

We have received your letter, dated October 3, 1986, outlining your long-term

corrective actions planned to resolve signal cable transmission problems bet-

ween the Meteorological Building and the Control Room at the Haddam Neck Plant.

These actions will be examined during a future inspection of your Radiological

Environmental Monitoring program.

Your cooperation with us is appreciated.

Sincerely,

Oririn.6i 5iero II7

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/ y as T. 'Ma t n, Dirdcior

Division of Radiation Safety

and Safeguard 2

cc:

R. Graves, Plant Superintendent ~.

D. O. Nordquist, Manager of Quality Assurance

R. T. Laudenat, Manager, Generation Facilities Licensing

E. J. Mroczka, Vice President, Nuclear Operations

' Gerald Garfield, Esquire

Public Document Room (PDR)

Local Public Document Room (LPDR)

Nuclear Safety Information Center (NSIC)

NRC Resident Inspector

State of Connecticut

D611030167 861023

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CONNECTICUT YANKEE ATOMIC POWER COMPANY

B E R L I N. CONNECTICUT

P O BOX 270 HARTFORD. CONNECTICUT 06141-0270

TELEPHONE

203-665-5000

October 3, 1986

Docket No. 50-213

B11652

Mr. Thomas T. Martin, Director

Division of Radiation Safety and Safeguards

U.S. Nuclear Regulatory Commission

Region I

631 Park Avenue

King of Prussia, Pennsylvania 19406

References: (1) T. T. Martin letter to J. F. Opeka, dated

May 20, 1985

(2) J. F. Opeka letter to T. T. Martin, dated

August 14, 1985

Gentlemen:

Haddam Neck Plant

Inspection Report No. 50-213/85-08

Informational Letter in Regard to

Unresolved Item No. 50-213/85-08-04

I&E Inspection No. 50-213/85-08 identified an unrer31ved item

(No. 50-213/85-08-04) in regard to Connecticut Yankee Atomic

Power Company's (CYAPCO) inability to bring meteorological

monitoring equipment within tolerance ranges specified in cali-

bration procedures. As pointed out in the inspection report,

CYAPCO attributes this problem to defects in certain pairs of the

underground meteorological signal cable between the Meteoro-

logical Building and Control Room. Because of this problem,

CYAPCO committed to provide a short term solution and evaluate

potential long term solutions considering the recurring nature

associated with the underground meteorological signal cable.

Again, as noted within your inspection report on March 31, 1985,

during a phone conversation CYAPCO confirmed that a short term

solution had been accomplished. This was done by utilizing spare

pairs within the existing cable for meteorological signal trans-

mission. Once this switchover was completed, successful

instrument calibration was attained. This short term solution

did not address the concern about the long term ir2tegrity of the

underground cable.

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In response to your second request to evaluate a long term

solution, phase one of the two part action plan committed to in

Reference (2) has been completed. A supplemental means of data

transmission via use of an on-demand, dial-up data terminal was

installed in the control room to obtain meteorological data from

the mini-computer at the base of the tower, via a telephone line

completely separate from the underground meteorological signal

cable. This terminal was operational on October 1, 1985. The

strip chart recorders remained operative. Thus, there are

presently duplicate paths for getting meteorological data to the

control room.

The planned final solution to provide meteorological data access

in the control room, which we initially planned to have in-

service by October 11, 1986 per Reference (2), entails replacing

the existing analog recorders with digital data displays and

installing a dedicated, real time data terminal. This will

continually display meteorological data which will be digitally

transmitted via a telephone line rather than by the existing

underground cable whose long-term integrity is uncertain.

The request from the station for corporate engineering assistance

was delayed due to relatively low priority (the interim fix

worked well) during preparations for, and conduction of a major

refueling outage. Evaluation of manpower resources by corporate

engineering, when the request was finally received, determined

that an inservice date of December 1, 1987 would be reasonably

achievable, given other work in progress or already planned.

This is the date by which CYAPCO intends to implement the above

described final solution.

Very truly yours,

CONNECTICUT YANKEE ATOMIC POWER COMPANY

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J% f. Op6Ma

Senior Vice President

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