05000267/LER-1980-025-03, /03L-0:on 800523,during 800523-30,total Primary Coolant Oxidants Were Greater than 10 Ppm W/Average Core Outlet Temp Above 1,200 F on Six Occasions.Caused by Moisture Increase & Carbon Monoxide & Dioxide Combination

/03L-0:on 800523,during 800523-30,total Primary Coolant Oxidants Were Greater than 10 Ppm W/Average Core Outlet Temp Above 1,200 F on Six Occasions.Caused by Moisture Increase & Carbon Monoxide & Dioxide Combination

ML19318D261
Person / Time
Site:	Fort Saint Vrain
Issue date:	06/19/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19318D259	List: 05000267/LER-1980-025, Forwards LER 80-025/03L-0 05000267/LER-1980-025-03, /03L-0:on 800523,during 800523-30,total Primary Coolant Oxidants Were Greater than 10 Ppm W/Average Core Outlet Temp Above 1,200 F on Six Occasions.Caused by Moisture Increase & Carbon Monoxide & Dioxide Combination
References
LER-80-025-03L, LER-80-25-3L, NUDOCS 8007080275
Download: ML19318D261 (1)

LER-1980-025, /03L-0:on 800523,during 800523-30,total Primary Coolant Oxidants Were Greater than 10 Ppm W/Average Core Outlet Temp Above 1,200 F on Six Occasions.Caused by Moisture Increase & Carbon Monoxide & Dioxide Combination

Event date:
Report date:
2671980025R03 - NRC Website

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NRC FERM 384 U.S. NUCLEAR RERULATORY COMMISSION 87 77)

LICENSEE EVENT REPORT J

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60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT QATE 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h ITTTl I During the period frcm May 23. 1980. through Mav 30. 1980. total crimarv coolant oxi-I l o i a i l dants were greater than 10 ppm with average core outlet temperature above 1200*F on l

Ioi4l lsix separate occasions (three events).

Degraded mode of LCO 4.2.10 reportable per Ft.l I o i s i l St. Vrain Technical Specification AC 7.5.2(b)2.

No affect on nublic health and safetvk 10 is I l Similar occurrences reported in RO 77-36. RO 78-12. RO 78-18. RO 78-37. RO 78-39.

I 10171 lRO 79-01, RO 79-02, R0 79-24, RO 79-30, RO 79-45, RO 79-53. RO 80-11. R0 80-19 and I

i O ia l lR0 80-22.

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34 35 36 31 40 41 42 43 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h ji l O g lBrief increases in moisture (Event #1), carbon monoxide (Event 42). and a combination I lof carbon monoxide and dioxide due to reaction of residual moisture with core crachitel i i i, i2i I(Event #3) resulted in LCO 4.2.10 degraded modes. Events #1 and #2, no specific cor-l i,;3l l rective action due to decrease in total oxidants.

For Event #3, core outlet temoer-I g lature reduced to less than 1200*F.

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