ML20128E663

Special Rept 85-004:on 850419,invalid Failure of Diesel Generator Occurred.Caused by Operating Error.Rept Will Be Added to Operations Required Reading to Emphasize Importance of Close Adherence to Procedural Steps

ML20128E663
Person / Time
Site:	Wolf Creek
Issue date:	05/17/1985
From:	Koester G KANSAS GAS & ELECTRIC CO.
To:	Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
85-004, 85-4, KMLNRC-85-118, RO-85-4, NUDOCS 8505290440
Download: ML20128E663 (3)

Text

r

• A e KANSAS GAS AND ELECTRIC COMPANY THE ELECTAC COMPANY GLENN L MOESTER m . m .""""""

May 17, 1985 M @, B DW 3 %

Mr. Robert D. Martin )

Regional Administrator MM 2 0 E U.S. Nuclear Regulatory Comnission Region IV _ f/

611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 KMLNRC 85-118 Re: Docket No. STN 50-482 Ref: (1) KMLNBC 85-097 dated 4/29/85

~

from GIEoester, KG&E, to RDMartin, NRC (2) KMLNRC 85-099 dated 5/1/85 from GIEoester, KG&E, to RDMartin, NRC (3) KMLNRC 85-106 dated 5/9/85 from GLKoester, KG&E, to RDMartin, NRC Subj: Special Report 85-004

Dear Mr. Martin:

The enclosed Special Report is submitted pIrsuant to Technical Specifications 6.9.2 and 4.8.1.1.3.

The References transmitted Special Reports85-001, 85-002, and 85-003 respectively.

If you have any questions concerning this matter, please contact me or Mr. Otto Maynard of my staff.

Yours very truly, Glenn L. Koester Vice President - Nuclear GIK: dab

)

XC: PO'Connor (2)

JCuranins [V 8505290440 850517 2 II ADOCK 0500

@ 333 [DR 201 N. Market -WicNta, Kansas - Mail Address: RO. Box 208 i Wichita, Kansas 67201 - Telephone: Area Code (316) 261-6451

y Enclosure to EMINRC 85-118 SPECIAL REPORF 85-004 DIESEL GENERA'IOR INVALID FAILURE On April 19, 1985, at approximately 0257 an invalid failure of diesel generator (D/G) "A" occurred due to an operating error.

On April 19, 1985, at approximately 0255 CST, D/G "A" was started to perform periodic testing in accordance with surveillance procedure STS U-005A,

" Manual / Auto Start, Synchronization, and Ioading of Energency Diesel Generator NE01". Shortly thereafter, the Operator secured the diesel because, by his measurements, the generator required 12.48 seconds to attain the specified frequency (60Hz), and the Acceptance Criteria of STS U-005A state that the generator must attain 60 Hz in a time of less than or equal to 12 seconds.

An investigation into this failure was initiated. W e system line-up and air pressure were verified to be proper. It was determined that the operator had measured the time required for the generator to stabilize at 60 Hz instead of measuring the time required for the generator to initially reach 60 Hz, as required by procedure.

At approximately 0306 CST, D/G "A" was restarted per STS U-005A. We diesel met the acceptance criteria for a successful start. It was subsequently paralleled, loaded and run for 62 minutes. STS M-005A was completed satisfactorily at approximately 0425 CST.

We plant was in Mode 4 during this event. Technical Specification 3.8.1.1 requires that two diesel generators shall be operable. If one diesel generator is inoperable, Action Statement a., in part, requires verification of the operability of the other A. C. sources within one hour and restoration of the inoperable A. C. source to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. In this instance, D/G "A" was unavailable for approximately ninety minutes during the time from the termination of the initial test until the

, successful surveillance test was completed. During this time, verification of the operability of the remaining A. C. sources was performed, thus satisfying the Technical Specification Action Statement.

W is event is considered to be an invalid failure based on the criteria provided in Regulatory Guide 1.108. We start attempt at 0257 which was classified as unsuccessful can definitely be attributed to operating error and thus an invalid failure per Regulatory Position C.2.e. (2) .

l l Wis Special Report will be Mded to Operations Required Readirg to emphasize the importance of close Mherence to procedural steps.

I An independent verification of each of the emergency diesel generator's operational history has recently been completed. W e results of this review i indicated that the numbers of valid successful tests previously described in i Special Reports85-001, 85-002, and 85-003 were based on information that hM not been canpletely verified. We numbers of valid successful tests, as of April 19, 1985, are as follows.

I k

4 Enclosure to EMINRC 85-118 Special Report 85-004 Page 2 W ere have tJen seve?:n (7) valid successful tests of D/G since "A" the canpletion of preoperational testing on D/G "A". Durirg the same time period, includity tle invalid failure discussed in this report, five (5) invalid failures and no valid failures have occurred in D/G "A". Were have been six (6) valid successful tests of D/G "B" since the coupletion of preoperational testing on D/G "B". During the same time period, four (4) invalid failures and no valid failures have occurred on D/G "B".

We diesel generator testing frequency of at least once per 31 days was not affected by the independent verification or invalid failure described in this report. % is is in conformance with the specifications of Regulatory Position C.2.d. (1) of Regulatory Guide 1.108 and Technical Specification Table 4.8-1 which require the test interval to be not more than 31 days if the nunber of valid failures in the last 100 valid tests is one or zero.

i l

L l

I l

1 :-

-- . _ . . . _ _ _ _ _ . __ __ _ _ _____ _ ._