ML19269C290

LER 78-029/03L-0 on 781227:in Mode 1 Operation,During Main Turbine Roll,Main Steam Relief Valve 2PSV1053 Lifted,Due to Steam Dump Valve Failures.Valve Failed to Reseat,Causing RCS Temp to Drop 107 Feet within 52 Min

ML19269C290
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/25/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19269C282	List: ML19269C281 ML19269C283 ML19269C287 ML19269C290
References
LER-78-029-03L, LER-78-29-3L, NUDOCS 7901310056
Download: ML19269C290 (1)

Text

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NRC FORM 366 U. S. NUCLE AR REGUL ATORY COMMISSION (7 77)

LICENSEE EVENT REPORT EXHIBIT A CONTROL BLOCK: l i l l l l 6lh (PLEASE PRINT OR TYPE ALL REQUtRED INFORMATION)

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0 s t i$ LL._J@l0 15 p l 0 60 (p t 0 l3 l 6 l 868l@l691 l 2EVENT l 2 DATE7l 7 l 8 ]gl0 11 l2 l5 l7 l9 g DOCKET hbMB E R le 75 HE,OHf DATE to EVENT DESCRIPTION AND PROBA0LE CONSEQUENCES h I01211 Mode 1 operation, during Main Turbine roll, Main Steam relief valve ,

o 3 l 2PSV1053 lifted, due to steam dump valve failures (reference LER ,

I6 TTl L5.0-318/78-SH . and failed to reseat, causing the RCS temperature to l in ist i drop 1070F within 52 minutes, exceeding 1000F/hr. limit per T.S.3.4.9.1.b j l0 j6 ] l for an approximate 10 minute period. No similar occurrences. Reportable o i I per T.S.6.9.1.9(b). ,

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PTION AND CORRECftVE ACTIONS h m 1 The relief valve reseated after > 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> of blowdown. RCS Tave was re- ,

ppj stored to 5450F within 30 minute;; as required by Action Statement i 2 1 T.S.3.4.9.1. An engineering evaluation was performed by the NSSS vendorg g i to determine the effects on the fracture toughness properties of the RCS.,

, 4 i It was determined that the RCS remains acceptable for continued operation.

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