ML20024G684

LER 91-006-00:on 910403,discovered That Ac Offsite Power Source Surveillance Not Performed Due to Personnel Error. Surveillance Initiated Immediately & Positive Discipline Administered to supervisor.W/910418 Ltr

ML20024G684
Person / Time
Site:	North Anna
Issue date:	04/18/1991
From:	Kane G VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-91-006, LER-91-6, N-91-006, N-91-6, NUDOCS 9104240428
Download: ML20024G684 (4)

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YlROINIA ELEC THic AND POWE R COMP ANY NORTH AN N A POWER S TATION P. O. BOX 4 02 WIN E R AL, VIRGINI A 23117 10 CFR 50.73 April 18,1991 U. S. Nuclear Regulatory Commission Serial No. N 91-006 Attention: Document Control Desk NAPS: PAK/JRP Washington, D.C. 20555 Docket Nos. 50-338 License Nos. NPF-4

Dear Sirs:

- The Virginia Electric and Power Company hereby submits the following Licensee Event Report applicable to North Anna Unit 1 Report No. 91-006-00 This Report has been reviewed by the Station Nuclear Safety and Operating Committee and will be forwarded to the Corporate Management Safety Review Committee for its review.

Very Truly Yours, G. E. 'ane Station Manager

Enclosure:

cc: U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W.

Suite 2900 h- Atlanta, Georgia 30323 p Mr. M. S. Lesser NRC Senior Resident Inspector North Anna Power Station

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_. At.1440 hours0.0167 days <br />0.4 hours <br />0.00238 weeks <br />5.4792e-4 months <br />, on April 3, 1991, with Unit 1 operating-at 99.2% . power (Mode 1), _and 1J Diesel Generator tagged out for pre planned maintenance, it was. discovered that an-8 hour Technical Specification (TS) Surveillance had not behn perf ormed . wi thin the allowed interval. Technical Specification

3. 8.'1.1, . ' Action Statement (b), requires that whenever one diesel generator is

declared inoperable, the operability.of the A C. Off-site Power Sources-must

! be verified within one hour, and at least once por 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. This event is reportable, pursuant to 10 CFR 50.73 - (a) (2) (1) (D) as a condition prohibited by' Technical Specifications 4.0.3 and 3.8.1.1.

The cause of the event which resulted in . the f ailure to perform the required surveillance was personnel error. Following discovery of the omission at 1440 hours0.0167 days <br />0.4 hours <br />0.00238 weeks <br />5.4792e-4 months <br />, Operations immediately-initiated the offsite A.C. Power Source

' verification and satisfactorily completed the surveillance at 1455 hours0.0168 days <br />0.404 hours <br />0.00241 weeks <br />5.536275e-4 months <br />, n

This. event posed no significant safety implications since off-site power sources remained operable during . the period, as evidenced by successful

= completion of the A.C. Off-site Power Sources surveillance procedure. Alarms

. and indication were available to Control Room- personnel to provide status of Electrical Distribution System at all times. Therofore, the health and safety

, . of the general public was'not affected at any time during this event.

N AC Perm 366 leell

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P ACILITY hAME 04 DOCall NUMetR (2l LER hum 98R 16) PAGE(31 "D'/El' 0'M.N NORTH ANNA POWER STATION UNIT 1 0 l6 l0 l0 l0-l 3l 3l 8 9; 1 __

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Og 0 0l 2 OF Og 3 Text t#r mee hwe a reewm,. == estow mec sem assa v nn 1.0 Descr_1ption of the Event At 1440 hours0.0167 days <br />0.4 hours <br />0.00238 weeks <br />5.4792e-4 months <br />, on April 3, 1991, with Unit 1 operating at 99.2% power (Mode 1), and IJ Diesel Generator (EIIS System Identifier DG) tagged out for pre-planned maintenance, it was discovered that an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> TS Surveillance had not been performen within the allowed interval. Technical Specification l- 3.8.1.1, Action Statement (b), requires that whenever one diesel generator is declared inoperable, the. operability of the A.C. Off-site Power Sources (EIIS s System Identifier UJX) must be verified within one hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereaf ter. TS ' Surveillance Action 4.0.2, also required that each surveillance be performed within the specified surveillance interval with a maximum allowable extension not to exceed 25% of the surveillance interval.

l This - event- is reportable pursuant- to 10 CFR 50.73 (a) (2) (i) (B) as a

. condition prohibited by Technical Specifications.4.0.3 and 3.8.1.1.

The 1J diesel generator had initially been tagged out and the required surveillance performed at 0325-hours on April 3, 1991. The next required 8 )

hour surveillance interval should have been at 1125 hours0.013 days <br />0.313 hours <br />0.00186 weeks <br />4.280625e-4 months <br />, however it was not j until 1455 hours0.0168 days <br />0.404 hours <br />0.00241 weeks <br />5.536275e-4 months <br /> that it was actually. completed. I

-2. 0 Significant Safety Consequences and Imolicationg l .'This event posed no significant safety implications since off-site power p sources remained operable during the period, as evidenced by 'successf ul h completion of the A.C. Of f-site Power. Sources survelliance procedure. Alarms l and indication were available to control Room personnel to provide status of

l. Electrical = Distribution System at all times. Therefore, the health and safety l of_the general public was not affected at any time during this event,

l. .

! 3.0 Cause of the Event

-The cause of the event 1which resulted in the f ailure to perform the required surveillance was personnel error.

! -. 4.0 Immedinte Corrective Act mg d

. Following discovery of the omission at 1440 hours0.0167 days <br />0.4 hours <br />0.00238 weeks <br />5.4792e-4 months <br />, Operations personnel

, immediately initiated a verification of the A.C. Off-site Power Sources and

[ completed the . required TS surveillance at 14 55 hours6.365741e-4 days <br />0.0153 hours <br />9.093915e-5 weeks <br />2.09275e-5 months <br /> with satisfact.;y

'results.

> 5.0 ' Additional Corrective Actions W

L Management administered positive discipline to the Supervisor regarding the-importance-of attention-to detail.

The 1 LER and proposed corrective actions will be placed into the Operations Department Required Reading Program.

_ NRC Form 366A 1649) .

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-NORTH ANNA POWER STATION UNITS 1 l0 l6 j o j o lo-l 3l 3[8 9l1 Og 0l 6 O0 g 0l 3 or 0)3 tixi 11nwe pace e omrwat, one noeww Mc ram ansa no (1n

-6.0 Actions to Prevent Recurrence The details of this incident will be included in the Licensed Operator Requalification Program (LORP) to ensure all operators have been counseled on i the Importance of attention to detail in performing scheduled TS Surveillances.

7.0 Similar Events Slallar_ recent Licensee Event Reports (LER) involving missed surveillances due to personnel error were as follows: )

LER N1-90-003-00 Failure to include 52 valves ~1nto the monthly containment Integrity -verification Surveillance Program and perform monthly surveillance tests on 27 other valves, j LER N1-90-006-00 Failure to perform channel functional testing of'two-pressurizer power operated relief valves prior to l returning to service. .J l

LER N1-90-010-00 Failure to . perform monthly and quarterly IST Surveillances of Auxiliary Feedwater Pumps and Valves as well as monthly surveillance channel checks for Auxiliary Feedwater Flow Rate Accident Monitoring Instrumentation.

8.0 Additional Inform tion

! North Anna Unit 2_was in Mode 1 throughout this event and was not

'affected.

l f;

.N7.C Form 364A (6491 a

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