ML20006A079
| ML20006A079 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 01/17/1990 |
| From: | Bailey J WOLF CREEK NUCLEAR OPERATING CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 89-004, 89-4, NO-90-0018, NO-90-18, NUDOCS 9001250181 | |
| Download: ML20006A079 (3) | |
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NUCLEAR OPERATING CORPORATION g[y.
January'17,1990 w A,4~
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ATTN s Document-Control Desk <
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Subject:
3 Docket.No. 50-482:.Special Report 89-004 n.
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.The;: attached.Special'. Report. is being ' submitted-pursuant. to Technical
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? Specifications-4.8.1.1.3 and'6.9.2. -This; report' concerns an invalid-failure-s f.9 of Emergency.DieseljGenerator "B" due to a Diesel Watch Operator error.
'If?-.you.;have-fany questions'.concerning'this matter,;!please. contact me or
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- Mr.,H." K. Chernoff of.my; staff..
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/d Very truly yours, 4
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4 John A. Bailey =
E' b Vice President
' Nuclear Operations' 1JAD/aem.
Attachment; cca BD L.iBartlett (NRC)..wfa E. J. Holler (NRC)~,'w/a R.;D.- Martin (NRC), w/a D. V. Pickett (NRC), w/a 1
9001250181 900117 FilR ADOCK 05000482 PDC.
f RO. Box 411/ Burlington, KS 66839 / Phone: (316) 364-8831
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An Equal Opportundy Employer W/HCNET
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7, i{ g Special Report 89-004-
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. Invalid-Failure of Bnergency Diesel, GeneratorB' i
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Due to an Operator Error t
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On December,19, 1989, an invalid failure of Emergency Diesel Generator
'B' 72 occurredidue to personnel error. This.Special Report is being submitted in
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DESCRIPTION OF EVENTS l, 3, 18, 1989, at 1744 CST, Emergency Diesel Generator (D/G) 'B'-was
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On December i
started'for;the-performance'of;a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> surveillance test.. Prior to the i
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run, several fittings on instrument lines had been' isolated pending I'
l completion offa_ design modification.
The modification replaced several
. fittings:1n order'to provide-for'a single manufacturer of the fittings and to make them:as uniform as possible.' This modification had been' performed j
on the rocker arm lube oil' pressure transmitter lines prior to the test, however the lines' remained isolated because final approval of the work had
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--not been-performed. For.this reason operators taking local rocker' arm lube i
oil' pressure readings.every-30 minutes-were' required to open the pressure transmitter-line. isolation-valves prior to taking the pressure ~ reading and-
+close-the isolation' valves after the reading.- This had been performed uneventfully-for-approximately the first 16-hours of the-24 hour test.
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- At
- 0900 CST on December 19. 1989, an operator took over'the diesel watch and 9
was instructed on the.special circumstances; surrounding the rocker arm lube'-
- oll pressure readings. -In addition, an information tag was in place on two isolation' valves which stated that both isolation valves-were' required to be u
open in, order to:obtain" correct pressure readings for the rocker arm lube-E oil. An'information tag was not on the local pressure gauge (which is located.on a panel in the D/G room). The operator correctly took the first
- pressure reading at approximately 0905' CST. Ilowever, when the operator took the next set of readings at 0930 CST, the operator thought he had opened the
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pressure trasmitter line-isolation valves when in fact, he had not.
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pressure gauge.showed a-low and decreasing pressure. The operator called l
- the control room to inform them of the low pressure at 0939 CST.
The
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indicated pressure continued to drop and at 0953 CST the control room E
operators made the conservative decision to unload the D/G. Rocker arm lube L
oil pressure remained lott and the D/G was secured and declared inoperable at
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0959-CST on December 19, 1989.
g Troubleshooting by other operators following the event found that the
, pressure transmitter line isolation velves were still closed.
In discussing 1
this with the diesel watch operator, he determined that he had not opened
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the isolation valves prior to taking a pressure reading. Upon opening the valves, the pressure readings returned to normal (the rocker arm motor driven pre-lube pump was running which maintains operating pressure).
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' 2 C,biAttachment to'NO 90-00181
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un 100T CAUSE AND CORRECTIVE ACTION 1 The' root cause of this failure was the' operator forgetting to open the
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isolation valves 1for'the rocker arm _ lube oil pressure. transmitter _line prior to taking-a-pressure reading..The operator _was aware of_the need to perform
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this' action and had performed it correctly shortly before. The' modification:
Lwhich replaced-the fittings on the instrument-lines lwas approved shortly QL
+ afterithis eventist 1325 CST on' December 19, 1989.- This removed the need Lfor operators'to manipulate the isolation valvesLto.obtain pressure readings nF "which will prevent thisLfailure from recurring. 'Although completion of this 4
modification.before the D/G' test would have been possible and would'have
-. prevented the failure from occurring, operators and other personnel involved.
had no reason to believe it was necessary since it did not affect the
- operability ofLthe
- D/G and did not appear to impose any significant difficulties for=the-operators conducting the test'.
FAILURE CLASSIFICATION The failure: described in this report was caused by operator erroriand is therefore an invalid failure in accordance with' Regulatory Position C.2.e(2) of Regulatory _ Guide.l.108. D/G "B" was declared operable at 1120 CST on December 19, 1989,Lafter determining <the cause_of this failure and confirming that.the' rocker arm. lube oil pressure was normal. This resulted
.in the D/G:being'out of service for a total'of one hour and 23 minutes. At no-time duringsthis' period was the D/G in a condition that would have-
,(prevented it from starting if required in an emergency. A successful 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> load test of the D/G was performed on December 20-21, 1989. Through December;19, 1989 Jthere_have beenLa total-of 90 successful valid tests, four valid failures, and eight invalid failures of D/G "B".
From the time
.of the last valid failure ~on November 11, 1988, there have been 27 successful valid tests of D/G "B".
This failure does not change-the testing frequencyfoi once every 31 days as required in Table 4.8-1 of. Technical
' Specification 3.8.1.1.
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