ML20086L185
| ML20086L185 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/12/1974 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086L190 | List: |
| References | |
| AO-74-21, NUDOCS 8402070453 | |
| Download: ML20086L185 (1) | |
Text
PcIch Bottoa Ato c wer o a on jdh 3.$ R. $ /( d 1 5 4f~337'//Chy'i'l 6
Delta, Pennsylvania b
April 12, 1974 Ul i
Mr. James P. O'Reilly, Director l
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United States Atc=ic Energy Co-aission
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Directorate of Regulatory Operation,
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1 631 Park Avenue j
King of Pruccia, Pennsylvania 19406 i
a Bubject:
Abnor-al Occurrence 24-Hour Notification j
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Confirming r.y conversation with Mr. R. A. Feil, A.E.C. Region I Rt6ulatory Operations Office on April 12, 1974 1
Reference:
License Nu=ber UFR 44, Anendment Number 1 i
Technical Specification
Reference:
Note 4 to Table 3 1.1 l
Report No.:
50-277-74-21 Report Date:
'nril 12,1974 i
Occurrence Date:
April 1.1, 1974 L
Facility:
Peach Botton Atomic Power Station R. D.1 Lolta Ibnnsylvania 17314 Identifict. ion of Occurrence:
Inoperability of PS-2-5-14C and PS-2 + 14D Conditions Prior to Occurrence:
Plant at 2% Power Description of Occurrence:
During the pinnt start-; a to greater than 30% power, the operability of the preccare ewitchen which cence turbine first stage pressare were tonitored.
It was rated that all the prermure evitches failed to operate at the 30%
power level. Before proceeding up in power above 30%, the setpointo on the e
cwitchee were adjunted to provide the proper logic input to the RPS aystem.
During the subsequent chutdown, these pressure cwitches were recalibrated
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in accordance with a new curve of first stage turbine pressure vercus power based on data obtained during the previous operation. Duving the next start-up, the C and D pressure evitches failed to operate at the correct turbine power level and were again readjunted to provide proper logic input S$
before exceeding 30% power.
Subsequent investigation determined that the s
@7 sensins line from the turbine was not delivering the proper preocure signal 1
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$8 to th-ce two evitches. Because. plant conditions prevented access to portions n
bg of the sensing line, the wires to the proper ' logic relays were lifted to'~
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provide the proper EPS logic inputs.
4 Designation of Apparent Cause of Occurrence-1 3@
It is presently believed that a blockage exists in the semaing line frem d
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= g.._lhtfirst.cMat Drbine ptercure toJTe-2-5-14 and_D._Thie. blocaze my_bt__ _...__ W a closed root valve. 'ihio valve is inaccesetble at the present time.
og to o.tn Acalysis of 0;currence:
There are to cafety implications aceociated with this occurrence because the
. inputs to'the. Pld uycten were alvajaTn the safe direction., Supervicory j
personne1 ensureo proper position at the turbine trip scram bypass relays r--
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Corrective Action:
On each occassion.vb-proper relay operation did no cur, setpoint '
adjusteents were ca
. r 1cado were lifted to provid-4 roper inputo to the RPS logic. These action; woro conservative in that they ensure a reactor ceras fron turbine trip at any power level (not only above l
30% power). Final corrective action cuot 'avait the next plant shutdown.
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Failure Dato'
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. None.
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Very,truly yours, i~
y pfQ V. 7. Ullrich, Superintendent s
Peach Bottos Atomic Power Station.
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