ML20070F732
| ML20070F732 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 12/10/1982 |
| From: | Tucker H DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8212210231 | |
| Download: ML20070F732 (6) | |
Text
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DUKE POWER GOMPANY P.O. DOx 33180 CHARLOTTE. N.C. 28242 IIAL D. TUCKER TELEPHONE vna PRESIDENT (704) 373-4531
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December 10, 1982 Mr. James P. O'Reilly, Regional Administrator
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U. S. Nuclear Regulatory Commission y
Region II 101 Marietta Street, Suite 3100 3
Atlanto, Georgia 30303 n
Re: Catawba Nuclear Station b
Units 1 and 2 Docket Nos. 50-413 and 50-414 m
Dear lir. O'Reilly:
Pursuant to 10 CFR 50.55e, please find attached Significant Deficiency Report SD 413-414/82-24.
Very truly yours, O
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f Hal B. Tucker RWO/php Attachment cc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission s:
Washington, D. C. 20555
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Mr. P. K. Van Doorn NRC Resident Inspector
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y-Catawba Nuclear Station Mr. Robert Guild, Esq.
Attorney-at-Law P. O. Box 12097 Charleston, South Carolina 29412 L
Palmetto Alliance 2135 Devine Street Columbia, South Carolina 29205
,n us CO?Y 8212210231 821210 0
PDR ADOCK 05000413
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CATAWBA NUCLEAR STATION REPORT NUMBER:
SD 413-414/82-24 REPORT DATE: December 10, 1982 FACILITY: Catawba Units 1 and 2 IDENTIFICATION OF DEFICIENCY:
Some ITT Barton Class 1E transmitters exhibit thermal non-repeatability which results in performance outside of manufacturer's specifications. This deficiency was originally identified by Barton's October 29, 1982 telex to Mr. R. C. DeYoung of the NRC which was transmitted to Duke by a November 2,1982 Barton letter (attached).
INITIAL REPORT:
On November 12, 1982, A. Ignatonis,. NRC Region II, Atlanta, Georgia, was notified of the subject deficiency by W. O. Henry, D. L. Canup and G. D. Rowland of Duke Power Company, Charlotte, N. C.
28242.
COMPONENT AND/0R SUPPLIER:
Some ITT Barton Model 763 and 764 Class 1E transmitters delivered after 7/1/79. (revised scope of potential defect per Barton's November 23, 1982 letter, attached).
DESCRIPTION OF DEFICIENCY:
ITT Barton was contacted by a customer concerning thermal non-repeatability with some of the Barton units. During Barton's early investigation, they discovered that some of the units were not within their specifications after the units were cycled from a nominal calibration temperature (80 degrees F) to an operating temperature of 130 degrees F, as well as accident tenperature of up to 320 degrees F, and returned to 80 degrees F.
The magnitude of the dcviation from the calibration accuracy specification of 10.5%
at 80 degrees F was between 0.1% to 0.5%.
Barton had determined that those Model 763 and 764 transmitters manufactured after 9/1/81 were suspected of exhibiting thermal non-repeatability.
According to Barton's November 23, 1982 letter, the extent of the transmitters affected was also expanded to include all Model 763 and 764 transmitters delivered after July 1, 1979. The transmitters were also found to deviate from their temperature coefficient specification in that the effect of a change in ambient temperature from 80 to 130 degrees F would not be 10.5%, but up to 11.0% instead.
ITT Barton Model 764 transmitters which could potentially exhibit this problem have been ordered for Catawba Units 1 and 2 for application as safety-related Auxiliary Feedwater Flow Transmitters. These transmitters are in the process of being manufactured by Barton and any defects will be corrected by Barton before shipment.
Page 2 i
ANALYSIS OF SAFETY IMPLICATIONS:
Each of the above referenced auxiliary feedwater flow transmitters provides a signal to a dedicated indicator in the control room. The requirements of NUREG 0737 are met and exceeded by Duke Power's design as the instrument loop is Class IE (environmentally and seismically qualified and powered from a Class IE power source). The instrument loops are provided to monitor operation only, i.e. no alarms or interlocks are provided.
Regulatory Guide 1.97, revision 2* states that the auxiliary feedwater flow application
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is a type D variable (those variables that provide information to indicate the operation of individual safety systems and other systems important to safety), the purpose of which is to monitor operation.
Therefore, the potential defect would not create a safety hazard.
CORRECTIVE ACTION:
According to ITT Barton, the deviation in the specifications are caused by leakage current paths from the electronic circuitry to case ground after exposure to high temperature.
The leakage current path has been determined to be between the span and zero potentio-meters and the associated brackets. The problem has been eliminated by the addition of insulating spacers between the potentiometers and the brackets. The units ordered for Catawba will not be shipped to Duke Power until the potential defects are corrected.
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lECENED BY SKD - MllJ Div.
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NOV 05 G82 6
Barton Instruments A Unit of
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International Telephone and Telegraph Corporation November 2, 1982 900 S. Turnbull Canyon Rd.
- P.O. BOX 1882 CityofIndustry, Ca.91749 Tel. (,213) 961-2547 Telex 67 7475 Mr. S.K. Blackley, Jr., Chief Engineer Mechanical & Nuclear Division Design Engineering Duke Power Company P.O. Box 33189 Charlotte, NC 28242 C 8f -.
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% ATTENTION: Gene Sanders
SUBJECT:
Notification of Defect in Accordance with 10CFR Part 21 Gentlemen:
The following is a copy of the notification transmitted to the NRC on October 29, 1982. As you have been supplied by ITT Barton with equipment possibly affected by this notification we are providing you with a copy of the text of that TLX.
ITT Earton has not yet determined to what extent the equipment supplied to you will be affected. However, the investigation is on-going and any results affecting your equipment will be transmitted to you as soon as it becomes available.
Sincerel,
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WCA h5G DFT Kevin J. 8 clean KSC Contract Administrator (4L
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(A Barton Instruments A Unit of November 23, 1982 International Telephone and Telegraph Corporation 900 S. TurnbullCanyon Rd.
- P.O. BOX 1882 CityofIndustry, Ca.91749 Tel. (213) 981-2547
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Mr. S.K. Blackley, Jr., Chief Engineer Mechanical & Nuclear Division Design Engineering Duke Power Company P.O. Box 33189 Charlotte, NC 28242 ATTENTION:
Gene Sanders rfd G
Gentlemen:
Tests conducted since ITT Barton's October 29, 1982 report to the NRC, of a possible defect in the Model 763 and 764 transmitters, have resulted in identification of the cause of the reported deviation. The deviations are caused by leakage current paths from the electronic circuitry to case ground af ter exposure to high temperature. This leakage path has been eliminated from transmitters currently being manufactured.
The maximum extent of the possible combined zero and span error, as a percentage of calibrated span, on transmitters covered in the report to the NRC, are as follows:
Operation at First five After five temperatures minutes of minutes of up to +1300F DBE (44200F)
DBE (+420 F)
Model 763 with zero i 1.5%
i 12.5%
Within pub-elevated more than lished speci-50% of calibrated fication span
(+ 10.0%)
Model 763 with zero (11.0%
i 12.5%
Within pub-based calibration lished speci-
)
fication
(+ 10.0%)
4 Model 764
' i 1.0%
1 7.75%
Within pub-lished speci-i fication f 00 (i 10.0%)
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Mr. S.K. Blicklcy, Jr., Chisf Enginser Duk:n Pow:r Comp:ny Attention: Gena Sinders 01 November 23, 1982 Page 2 l
The extent of the transmitters affected, as identified ir. our report to the i
NRC (all Model 763 and Model 764 transmitters delivered after September 1, 1981) has been expanded to include all Model 763 and Model 764 transmitters delivered after July 1,1979.
If you have any questions regarding this letter or require additional information, please contact me.
e Sincerely, f3
/
If John P. Doyon j
Nuclear Mark. Manager e
JPD/af 4
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