ML19343C205

LER 76-023/03L-0:on 760917,while Performing Surveillance of Containment Spray Sys,Load Sequencing Timer for Containment Spray Pump 51C Found Not within Tolerance Specified in Tech Specs.Caused by Relay Drift.Timer Reset

ML19343C205
Person / Time
Site:	Oyster Creek
Issue date:	10/15/1976
From:	Finfrock I JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-76-023-03L, LER-76-23-3L, NUDOCS 8103020039
Download: ML19343C205 (3)

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OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08751 Licensee Event Report Reportable Occurrence No. 50-219/76 3L Report Date October 15, 1976 Occurrence Date September 17, 1976 Identification of Occurrence Violation of the Technical Specifications, Table 3.1.1.M.1, when the diesel generator load sequence tiner (TK3) for containment spray pump 51C was found to be outside the specified tolerances. H is event is considered to be a 30-day reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.n. (1).

Conditions Prior to Occurrence ne major plant parameters at the time of the event were as follows:

Power: Reactor, 1906 Mwt Generator, 633 Krie (g)

Flow: Recirculation, 16.0 x 104 gpm 6

Feedwater, 7.1 x 10 lb/hr Stack Gas: 14,700 pei/ree Description of Occurrence On Friday, Septenber 17, 1976, at approximately 1930 hours0.0223 days <br />0.536 hours <br />0.00319 weeks <br />7.34365e-4 months <br />, while performing surveillance of the containment spray system, the load sequencing ticer for containment spray pump 51C was found not to be within the tolerances specified in the Technical Specifications. Instead of providing a pump start delay time of 4016.0 seconds, a start of SIC pump was initiated in 30 seconds.

l Apparent Cause of Occurrence The manufacturer's specifications for the relay state a nominal +.5*. drift due

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to switch repeatability and a +105 drift due to temperature chan es. The sum of these two are the bases for the Technical Specification's limit of +15*..

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The observed relay drift was outside this limit.

P00R ORIGINAL pum9

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( LICENSEE EVENT REPOf CONTROL BLOCK:l l l l l l l (PLEASE PntNT ALL REQUtnED INFORMATIOT.

1 6 LEENSE E ECEf4SE Evf NT NAME . ECENSE N!1MI'( H . TYPE fiPE 01 lNlJl0lClPl1l 14 l0l0l-l0l0l0l0l0l-l0l0l 15 25 l 4 l 1 l 1l 1l1l 20 30 l0l3l 31 32 7 89 CATEGORY TV DOCKET NUMDER EVENT DATE RrPORT DATE QCON T l 7 8 57 l

58 l U59 M 60 l0 l 5l 0l-l 0l 2l1l 9l 61 68 l 0l 9 l 1l 7l 7l 6l 69 74 l1l0l1l5l7l6 75 6 EVENT DESCR:PTION gg l hhile performing surveillance of the containment spray system, the load saquencing 7 JD g 3[ l timer for containment spray pump 51C was found not to be within the tolerances 7 89 g, El l specified in the Technical Specifications. The time was immediately reset to a 7 09 g 39 l value within the limits. (50-219/ 76-23-3L) g 7- 89 GG l 7 89 ,, g g

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@lSlBl (E_l l Cl Kl TlBl Rl K] lNl l El 0l9 l8 l ]48 7 89 10 11 12 17 43 44 47 CAUSE DESCR;PTION

@ l An Agastat time delay relay, Model 2414PD, provided a time delay of 30 seconds ...

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EE l instead of 40 +6.0 seconds in starting pump 51C. This time was not within the 7 89 7

@ l Technical Specification limit of 15'6. PORC has directed that the relay be changed out__

7 89 METHOD OF t

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% POWER DTHER STA1US OSCOVE RY DSCUVERY DESCAp1.0 J STATUS b W l 0 l 9_l 9 ] l N/A l y l N/A 7 0 9 10 12 13 44 45 46 6;

'AcirbiY coNitrJT AE LE ASED AMoutJT OF ACTfVITY LOCA10N OF DELE ASE EE J OF [0]AELElSE l N/A l l N/A 7 8 9 10 11 44 45 L PERSONNEL EXPOSURES NUMBE A TYPE DESCRiPTCN

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13 N/A .

(r i PERSONNEL INJun'ES .

NUVO!A DESCniPTON

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l 7 89 11 12 Probable Consequences DE l N/A 0

7 89 LOSS OR OAMAGE TO FACILITY TYPE DE SCP PTON Qyl N/A h-7 09 to I -

PUBLtCITY N/A l Ql 7 09 t-ADDITONAL FACTORS 7 89 L-EB I K 7 89 L n.nnn, Ryan R. Finfrnck . .ir. Vica procia e . - . . . ?n1 f;34 r.111

Reportable Occurrence No. 50-219/76-23-3L Page 2 October 15, 1976 Analysis of Occurrence Load sequencing timers are provided for sequencing loads onto the emergency bus to prevent overloading the diesel generators after a loss of power event.

The loads before and after the containment spray pump are sequenced to the bus at times of 20 seconds for the secondary core spray booster pump and 60 seconds for the CRD purg after the diesel generator breaker closes to energize the bus. The time of 30 seconds for the start of the containment spray pump recorded during the surveillance test did not fall with the band provided for these other loads; therefore, it would not have endangered the safe loading of the diesel generator.

Corrective Action Action taken was to reset the timer to within the Technical Specification limits. The Plant Operations Review Committ'e directed that the relay be changed out.

r,silure Data Manufacturcr: Elastic Stop Nut Corporation of America Type: Agastat Time Delay Relay Model: 2414 PD Serial Number: No. 1281636 l .

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