ML19263D346

LER 79-019/03L-0 on 781031:w/both Reactor Coolant Loops & Associated Steam Generators in Operation,One or More Main Steam Line Safety Valves Were Inoperable.Caused by Safety Valve Gagging.W/Chronological Log Describing Incidents

ML19263D346
Person / Time
Site:	Arkansas Nuclear
Issue date:	03/22/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19263D333	List: ML19263D332 ML19263D338 ML19263D343 ML19263D346 ML19263D352
References
LER-79-019-03L, LER-79-19-3L, NUDOCS 7903270480
Download: ML19263D346 (2)

Text

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

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HFPOH1 OATE EVEN T DESCRIPTION ANC PROBASLE CONSEQUENCES h o 2 i With both Reactor Coolant loops and associated Steam Generators in l 0 3 1 operation, one or more t'.ain Steam line code Safety Valves were inoperablp O 4 I driny Mode 1. 2. or 7 contrary to T.S.3.7.1.1. Valve inoperability andj n s I unit operation status are detailed on attached chronological log. The j O is I relieving capacity of the remaining safety valves exceeded that recuired; e i I for safe overation, as dictated by T.S. Table 3.7.-l. l o s J Pecortable_per T.S.6.9.1.9 (b). no similar occurrences.  ;

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36 s' 40 43 41 a3 de 47 CAUSE DESCR.PTION AND CORRECflVE ^CTiONS h i O 1 %e Fafety Va17es were carred due to excessive leakage, with the l

)i ii j i excettion of the three gagged on 11/21/78. No more tha.n three Safety i

, , i Valves were ever inoperable on either Steam Generator and the Linear 3 l Power High Trip Setpoint was always 5 405, meeting requirenents of m1 Action Statement T.S.3.7.1.la. Corrective action is included in attached, 8,lc,,,ppronological log. 9 ,, ,,,00 0, en status srOWER OT**EH ST ATUS L) Dt SCOV E R Y DISCO'. E HY DE SCHIP flON i 5 [B_J@ l 012 l Ol@p0f max. duringl W@l NA l

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ATTACHMENT LER 50-368/79-019 MAIN STEAM SAFETY VALVE GAGGING CHRONOLOGICAL LOG DATE TIME DESCRIPTION 10/31/78 2205 2PSV1052, 2PSV1056 gagged due to leakage, Mode 3 operation.

11/ 1/78 2015 2PSV1052 ungagged; no leakage, valve seated properly follow-ing system heatup.

11/ 2/78 2050 2PSVIO02 gagged due to leakage.

11/ 3/78 2230 2PSV1052 gagged due to leakage.

11/ 8/78 1733 2PSV1052 ungagged for test, remained ungagged, 11/11/78 2135 To Mode 4 or 5 operation, Mode 3 operation with safety valves inoperable for 263.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.

11/16/78 2PSV1002 replaced guide ring and worn rings. 2PSV1052 replaced worn rings. 2PSV1056 adjusted control and worn rings.

11/19/78 2010 To Mode 3 operation; 2PSV1056, 2PSV1002 inoperable.

11/21/78 0830 2PSV1052 gagged due to leakage.

11/21/78 2115 2PSV1055, 2PSV1052, 2PSV1056 remained gagged due to testing, no lockpins on worn ring.

11/28/78 New lockpins installed on all valves. 2PSV1002, 2PSV1055, 2PSV1056 ungagged. 2PSV1052 remained gagged due to gauled worn ring.

12/ 2/78 2353 To Mode 4 or 5 operation, Mode 3 operation with safety valves inoperable _ for 315.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />.

12/ 5/78 1455 To Mode 3, 2,1 or Reactor Critical 0260 F (Initial Criti-cality) operation; 2PSV1052 inoperable.

12/17/78 1000 2PSV1002 gagged due to leakage.

12/20/78 2057 To Mode 4 operation, Mode 3, 2 or 1 operation with safety valves inoperable for 366.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br />.

12/22/78 0320 To Mode 3, 2 or 1 operation; 2PSV1002, 2P'V1052 inoperable.

12/22/78 0900 2PSV1056 gagged due to leakage.

12/23/78 1410 To Mode 4 or 5 operation, Mode 3, 2 or 1 operation with safety valves inoperable for 34.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

12/25/78 2147 To Mode 3, 2 or 1 operation; 2PSV1002, 2PSV1052, 2PSV1056 inoperable.

12/27/78 0700 2PSV1053 gagged due to leakage.

12/30/78 1250 2PSV1056 ungagged, no leakage. 2PSV1054 gagged due to leakage.

2/ 1/79 0106 To Mode 4 or 5 operation. Mode 3, 2 or 1 operation with safety .ves inoperable for 890.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. Total hours to date, 1870.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. 2PSV1002, 2PSV1052, 2PSV1053, 2PSV1054 repaired during present outage. All valves modified with new stem guide and realignment of seating surfaces to alleviate the problem of premature leakage.