ML20125B721
| ML20125B721 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/18/1979 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| GQL-1554, NUDOCS 7912270523 | |
| Download: ML20125B721 (3) | |
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Metropolitan Edison Company g
Post Office Box 480 i
Middletown, Pennsylvania 17057 717 944 4041 Writer's Direct Deat Nur'3ber Decerher 18, 1979 GQL 1554 Director of Nuclear Reactor Rerulation 1+.+ n.
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Dear Sir:
'~hree Mile Island Nuclear Station, Unit 1 ('3!I-1)
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Eased on the information presented in the enclosu e, ve believe that a once per shift calibration check of the NI's is adequate to ensure that the power range amplifiers are properl-/ calibrated.
Sincerely,
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JGE:DWE:tas Vice President-Nucles-Operations Enclosure M
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METRCPCL~ TAN EDISCN CCMPAffY JERSEY CDI'"RAL PC'4ER & LIGHT CCMPANY and PETISYLVANIA ELECTRIC COMPANY
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.". O. 5 u^ -c A, 0 Th.is letter is submitted in rupport of the Nuclear Regilatory Cc= mission's verbal request concerning nuclear instrumentation calibration via telephone n.#.,.
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Sworn and subscribed to me this day of December 1979
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ENCLOSURE Su= mary of Operating Plant Data Shoving Results of Once Per Shi*t Nuclear Instrument Calibration Check 1.
Per surveillance procedure 1302-1.1, Pover Range Calibration (calibration check of all channels), a heat balance - neutron power check is performed once per shift.
2.
In a randem conth (. January 1979 in which TMI-1 was operated at 100% power) RPS channel calibration had to be performed only twice due to failure to meet one of the three acceptance criteria of 1302-1.1.
The three acceptance criteria are:
1.
If the absolute value of the offset error is equal to or less than 3.5%, the out-of-core imbalance is properly calibrated, 2.
if the console indicators are within i 25 of the heat balance power, the cut-of-core total power is properly calibrated, and 3
if the cer; uter readcut (Error linear Pover, ELP) is within + 15 of the cea+ '-a'n--e pcVer, the out-of-ccre tocal pcVer is properly calibrated.
3.
For the calibratiens which were perforned per 3) above, the third criteria was the only one that was not met.
!n ene case, EL? exceeded 1% by an average of 0.253% on all channels.
In the second case ELP exceeded 1% by 0.05% on Channel C
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