ML20148J452
| ML20148J452 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 07/05/1974 |
| From: | Autio H YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20148J451 | List: |
| References | |
| AO-50-29-74-3, NUDOCS 8011240122 | |
| Download: ML20148J452 (2) | |
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> ABNORYAli 00CURRE!!CE REPORT i
I r
i REPORT IrGERi
'50-29/7h-3 REPORT DATE:
July 5,.'197h OCCURREHCF DATE:
' June 27, 197h Yankee Atomic.' Electric Company,' Rove, Massachusetts' 01367 FACILITY:
t IDE'iTIFICATIO*! 0F OCCURRE"CE: Protective Instrumentation Setpoint-Drift-h COUDITIONS PRIOR TO OCCURRENCES: Refueling Shutdown, Shutdown Cooling Systen Operating, Reactor.. Coolant Tenperature at I
'1000F.
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' DrCCDv"" 0F OCCURRENCE
_-Durind routine refueling interval surveillance testing of the pressurizer
[
rressure channel, the lov pressure scran'setpoint vas. found to be at 1780 psig.
This ia a violation of the Technical Specifications Appendix A, Section D.2.d.1.
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and-Table 1 which lists a'nininun setpoint of 1800 psig.
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DESIT'ATIS" 0F APPARENT CAUSE OF OCCURRF.UCE i.
Inntru entation drift; setpoint too close to the Technical Specificatiens limit.
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.t A"ALYFIS OF OCCURREMCE The pressurizer pressure channel is one of two channels, the other being the i
nain'ecciant pressure channel, capable of serening the reactor-in event of a-low pressure condition. Surveillance testing of the main coolant pressure y 'ormed three weeks earlier showed the low pressure scran setpoint channa' to be.t - * 'inits. Therefore had a low pressure scran condition occurred, 4
the rew n r vould have been scranned prior to exceedinC the Technical Enecification limit.
Also, the YAEC Safety Analysis, FHSR Section h00, lists a trip setting of
.j 1750 psis used during the Transient Analysis. This setting is 21 psi less l
than the cut-of-tolerance value.
It could therefore be concluded that no additiene.1' risk to the health and safety of the public vould have occurred
'had the reactor been scra.ned at the out-of-tolerance limit.
~i CORF MT'"JE ACTION
,The11ovE;ressure scran setpoint was readjusted to 1830 psig to allow for instrunc:tation drift without exceeding the Technical Specification limit of L1303. 7::ig, i
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AEC DISTRIBUTION FOR PART 50 DOCKET MATERIAL b
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CONTROL NO:
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N/h FILE:
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DATE OF DOC DATE REC'D LTR TWX RPh CTHER Y:nkee Atomic Electric Company Rove, Mass. 01367 Mr. H.A. Autio 7-5-74 7-12-74 X
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ORIG CC OTHER SENT AEC PDR XXX j
SENT LOCAL PER XXX l
J.P. O'Reilly f
1 signed CLASS U:; CLASS PROP INFO INPUT NO CYS REC'D DOCKET NO:
XXX 1
50-29 DESCRIPTION:
ENCLOSU?2S:
Abnormal occu' rence Report No. 50-29/74-3 Ltr trans the following......
r concerning.... Protective' Instrumentation Setpoint Drift.....
(1 cy enc 1 rec'd) pga;T NAME:
Yankee Rowe m
L.
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