ML19263E002

LER 79-005/99X-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

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: ML19263E000 ML19263E002
References
LER-79-005-99X, LER-79-5-99X, NUDOCS 7904240305
Download: ML19263E002 (1)

Text

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75 i 60 61 DOCK ET Nt.,M3EH 6d 69 E% LNT DATE /4 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 o 3 heater drain tank level. A unit load reduction was commenced immediately. While l O 4 l load was being reduced, the condenser steam dump control valves opened, causing a 1 o i s t l hinh nteam flow condit ion. The valves remained open and resulted in a low steam l 0 6 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 />. The i O 7 l Plant recovered fron tlu. SI wit hout further incident. Safetv inlectionn t o A.t e: 1 o 11 operational, 2 preoperational. 1 7 8 9 11 0 SYST E M CAUSE C AUS E COVP. VALVE CODE CODE SUSCODE COMPONENT CODE SUBCODE SUECODE .

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_ EVENT YE AR R E.POR T N O. CODE TYPE NO

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30 31 32 ACTION FUTU4E frFECT SHUTDOWN ATT ACW/ E NT N P R U-4 FRWE COVP. COVPO*.TN T TAKEN ACTION ON PLANT METHOD HOURS = SUGMITT E D FOnM SUD. SUPPU E R MANUFACTunEH IIIlhlZlh l Alh 33 34 3'a lC lh Jti IOlGI7l5I 31 44)

[jij h 41 i42UI h lA lh IX19I9I9lh 43 A4 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i 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 .s l operation. l 7 .e 9 80 F ACILITY -

METMOD OF ST ATUS  % POWER OTH E R STA TU3 DISCOVE RY DISCOVEftY DESCHIPTION u i 5 l Elh l 0l 9l 2l@l M/A l l A I@l coorat or observation l ACTiv t TY CONTENT CELEASED CF HE LE ASE AMOUNT OF ACTIVITY LOCATION OF ret EASE i c N/A N/A 7 6 9 I z I @ l zi@l 10 11 44 i i 46 80 l

PERSONNEL E XPOSURES NUVEEft TYPE DESCRIPTION J 7

i 2 E 9 1010lol@lzl@l 11 12 13 N/A 80 l

PE R SO*4N E L INJURIES N UVBE f4 DESCRIPTION 7

i a 8 9 1010 0l@l 11 12 N/A RO I

LOSS OF 09 D AM AGE TO FACILITY TTPE DESLRIPTION LLLJb 9l z I@lto N/A l 7 E;0 2 a ,zUEfhl

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N/A 79042403of nRC usE cNov ,,

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7 8 9 10 68 69 CD. ;s NAME OF PREPARER M PH ON E:

412-643-1258

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