ML20091C050
| ML20091C050 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 02/17/1984 |
| From: | Tucker H DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML20091B983 | List: |
| References | |
| NUDOCS 8405300466 | |
| Download: ML20091C050 (2) | |
Text
.
o DUKE POWER GOMPANY P.O. Box 33180 CHQOTTE, N.C. 28242 1
\\O Trs.EPHONE IIAL II. TUCKER
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bl (704) 373-4531 vum====inc=v February 17, 1984 s
Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303 Re: RII:NE 50-413/83-50 50-414/83-38
Dear Mr. O'Reilly:
Please find attached a response to Violation No. 50-413/83-50-01 as identified in the above referenced inspection report.
Duke Power Company does not consider any information contained in this inspection report to be proprietary.
Very truly yours, af k ( <c
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Hal B. Tucker LTP/php Attachment cc: NRC Resident Inspector Catawba Nuclear Station Mr. Robert Guild, Esq.
Attorney-at-Law P. O. Box 12097 Charleston, South Carolina 29412 Palmetto Alliance 21353 Devine Street Columbia, South Carolina 29205 8405300466 840502 PDR ADOCK 05000413 0
PDR k
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Duke Power Company Catawba Nuclear Station Response to Violation 50-413/83-50-01 Violation:
10 CFR 50,' Appendix' B, Criterion V as implemented by Duke Power Company QA Topical Report, Duke-1-A, Section 17.2;5 requires that documented.
Instructions, procedures, or drawings include appropriate quantitative acceptance criteria for determining that important activities had been satisfactorily accomplished.
Instrument calibration procedure IP/0/A/3600/02 is used for calibrating diesel. generator fuel oil day tank level switches and provides assurance that minimum fuel oil quantity is available for use.
~ Contrary to the above, instrument calibration procedure IP/0/A/3600/02 dated January 31, 1983, was found to be inadequate in that it did not take
'into consideration the unusable amount of fuel oil in the bottom of the tank which must be. compensated for when calibrating level setpoint. This error would.have allowed the amount of fuel oil to be less than required for operations.
This violation is applicable to Unit 1 only.
. Response:
(1) We deny the portion of the NRC's stated violation pertaining to operations, but admit it is.possible for the day tank to contain less than a one-hour. supply without alerting the operators. The calculation which determined the setpoints for these switches was based on a commitment made to the NRC to maintain at least a one-hour supply of fuel in the day tank.
It was intended.that the low-low level alarm be calibrated to alert the operators that this limit was being approached.
Design Engineering'sicalculation took credit for an unusable tank volume calculated to be 13 25 gallons which would. supply the diesel for less than 100 seconds. Thus, at low-low level,.the tank would have provided 58 minutes and 20 seconds' worth of fuel. This design feature would not have resulted in the amount of available fuel to be less than requ' ired for adequate operations.
It should also be noted that the level in this tank is maintained in an operating band which is at least 2 inches higher (i.e.,15 34 gallons minimum) than the low-low level setpoint.
'(2)~ This error resulted from an incomplete review of the tank design details.
- (3) The Design Engineering calculation has been revised and no longer takes credit for the unusable volume.
(4) Other tank calculations were checked to determine If:similar errors had been made and none was found. Therefore, we feel this is an isolated occurrence and further. corrective action is not necessary.
(5)
.The. revised setpoint calculation for the Diesel Generator Fuel Oil Day Tank-has been completed and appropriate information has been transmitted to the. station.
No further action is deemed necessary.
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