05000334/LER-1979-005-99, /99X-0 on 790118:during Load Reduction,Condenser Steam Dump Control Valves Opened,Resulting in High Steam Flow Condition Causing Reactor Trip & Safety Injection. Caused by Valve Operator Exposure to Cold Temp

/99X-0 on 790118:during Load Reduction,Condenser Steam Dump Control Valves Opened,Resulting in High Steam Flow Condition Causing Reactor Trip & Safety Injection. Caused by Valve Operator Exposure to Cold Temp

ML19263E002
Person / Time
Site:	Beaver Valley
Issue date:	04/18/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19263E001	List: 05000334/LER-1979-005, Forwards LER 79-005/99X-0 05000334/LER-1979-005-99, /99X-0 on 790118:during Load Reduction,Condenser Steam Dump Control Valves Opened,Resulting in High Steam Flow Condition Causing Reactor Trip & Safety Injection. Caused by Valve Operator Exposure to Cold Temp
References
LER-79-005-99X, LER-79-5-99X, NUDOCS 7904240305
Download: ML19263E002 (1)

LER-1979-005, /99X-0 on 790118:during Load Reduction,Condenser Steam Dump Control Valves Opened,Resulting in High Steam Flow Condition Causing Reactor Trip & Safety Injection. Caused by Valve Operator Exposure to Cold Temp

Event date:
Report date:
3341979005R99 - NRC Website

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LICENSEE EVENT REPORT

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60 61 DOCK ET Nt.,M3EH 6d 69 E% LNT DATE

/4 75 HEFORT DAT E 4;0 EVENT DESCRIPTION AND PRGBABLE CONSEQUENCES h o

2 l At 2201 hours0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.374805e-4 months <br />, the 111lleater Drain Pump tripped on low suction prennure due t o low l heater drain tank level. A unit load reduction was commenced immediately. While l

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l load was being reduced, the condenser steam dump control valves opened, causing a 1

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o i s t l hinh nteam flow condit ion.

The valves remained open and resulted in a low steam l

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l line pressure which caused a reactor t rip and <:a f ety inlect ion at 7705 hours0.0892 days <br />2.14 hours <br />0.0127 weeks <br />0.00293 months <br />.

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7 l Plant recovered fron tlu. SI wit hout further incident.

Safetv inlectionn t o A.t e:

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11 operational, 2 preoperational.

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8 9 11 0 SYST E M

CAUSE

C AUS E COVP.

VALVE CODE CODE SUSCODE COMPONENT CODE SUBCODE SUECODE 10191 lii I c l@ [3_j@ I z l@ I V I ^ l t I v l o l P l@ I r lh I z i h 7

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COVPO*.TN T TAKEN ACTION ON PLANT METHOD HOURS

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o l The incident van cauned hv failure of the steam dump valves to close followinn the l li li j l load reiert ion.

The valves f ailed t o clone herause the valve operators were 1

lil l er. posed to cold t emperat ures hv iraproperiv posit ioned out r.ide air dannerr. In the l

l i l 3 l l turbine building haseuent. A cicarance will he posted on the dampers durinp, winter l i

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7 6 9 10 11 44 46 80 PERSONNEL E XPOSURES NUVEEft TYPE DESCRIPTION J 1010lol@lzl@l N/A l

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7 E 9 11 12 13 80 PE R SO*4N E L INJURIES N UVBE f4

DESCRIPTION

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