05000317/LER-1980-002-04, /04T-0:on 800322,instantaneous Hourly Average for Condenser Temp Rise Observed in Excess of Tech Spec Limit. Caused by Operator Inattention to Temp Rise Across Condenser & Environ Conditions

/04T-0:on 800322,instantaneous Hourly Average for Condenser Temp Rise Observed in Excess of Tech Spec Limit. Caused by Operator Inattention to Temp Rise Across Condenser & Environ Conditions

ML19309C370
Person / Time
Site:	Calvert Cliffs
Issue date:	04/03/1980
From:	Heibel R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309C363	List: 05000317/LER-1980-002, Forwards LER 80-002/04T-0 05000317/LER-1980-002-04, /04T-0:on 800322,instantaneous Hourly Average for Condenser Temp Rise Observed in Excess of Tech Spec Limit. Caused by Operator Inattention to Temp Rise Across Condenser & Environ Conditions
References
LER-80-002-04T, LER-80-2-4T, NUDOCS 8004080507
Download: ML19309C370 (2)

LER-1980-002, /04T-0:on 800322,instantaneous Hourly Average for Condenser Temp Rise Observed in Excess of Tech Spec Limit. Caused by Operator Inattention to Temp Rise Across Condenser & Environ Conditions

Event date:
Report date:
3171980002R04 - NRC Website

text

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 60 EVENT oESCRIPTioN AND PAoBABLE CONSEQUENCES O'o 10121 l At 1150, on March 22, 1980, the Control Room Operator observed that the l

instantaneot s hourly average for condenser temperature rise was in excess io,3, i io i, g of the 12 F limit. The Operator imediately reduced power.

Despite the l

io i s i ipower reduction the final hourly average of condenser temperature was 12.2 F.

I io gi l Subsequent investigation showed that the previous hourly average was also 12.2.

i [0 ) 7 ] l LER 78-36 (U-1) describes a similar event.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE oESCRIPTioN AND CORRECTIVE ACTIONS h i li l 0 l lThe major contributing cause of this event was Operator inattention to temoerature I

m Irise across the condenser. However, unusual environmental conditions served to I

t i # 21 lexacerbate this inattention. Hioh winds over the nrevious 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> had caused I

isi3 labnomally low tides and violent wave action in the bay. These two conditions I

iii41 Icaused seaweed to be sloughed from the intake oipino in unusually excessive amounts. I 7

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50-317 EVENT DATE 03/22/80 REPORT DATE 04/03/80 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSEOUENCES:

(CONTINUED)

Because of the short duration of time and the small amount by which the allowable temperature rise was exceeded, no environmental impact is expected.

(Appendix B, Technica.1 Specifications paragraph 2.1.1).

CAUSE DESCRIPTION AND CORRECTIVE ACTION:

(CONTINUED)

This seaweed then gathered in the condenser inlet water boxes causing flow reductions. The unusually lov tide also reduced circulating water pump suction head and thus flow. The reduced flow lead to.the increased temp-erature rise across the condenser.

Another compounding factor in this event was the season of the year.

Operating experience has shown condenser temperature rise is not a problem in the early spring, given normal flow through the condenser and the low injection temperatures of the bay. This fact desensitized the Operator to a possible condenser temperature problem.

3 The Operator involved was counselled by his General Supervisor and the importance of maintaining all plant parameters within their limits was stressed.

In addition, the importance of being cognizant of overall plant conditions was emphasized.

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