ML20246C313

Special Rept:On 890528,min Number of Operable Smoke Detectors on Containment Recirculation Air Sys Not Restored to Operable Status within 14 Days.On 890602,detectors Returned to Operable Status.Engineering Evaluation Underway

ML20246C313
Person / Time
Site:	North Anna
Issue date:	06/27/1989
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
89-444, NUDOCS 8907100319
Download: ML20246C313 (2)

Text

. _ _ _ _ _ _ _ _ _ _ _ _

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 June 27, 1989 i

U.S. Nuclear Regulatory Commission Serial No.89-444 Attention: Document Control Desk NO/DEQ R3 Washington, D.C. 20555 Docket No. 50-338 License No. NPF-4 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT 1 SPECIAL REPORT ON INOPERABLE SMOKE DETECTORS At 2125 hours0.0246 days <br />0.59 hours <br />0.00351 weeks <br />8.085625e-4 months <br /> on May 28, 1989, with Unit 1 in Mode 6 (Refueling), the Action Statement of Technical Specification 3.3.3.7 was exceeded when the minimum number of operable smoke detectors on the Containment Recirculation Air System were not restored to operable status within 1<4 days. The Action Statement requires that at least two smoke detectors be restored to operable status within 14 days or inspect the containment at least once every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and submit a Special Report to the Commission pursuant to Technical Specification 6.9.2.

The Containment Recirculation Air system is continuously monitored by three smoke detectors. At 2125 hours0.0246 days <br />0.59 hours <br />0.00351 weeks <br />8.085625e-4 months <br /> on May 14,1989, during the performance of 1-PT-106.6,

" Fire Protection - Robert Shaw Fire Detectors - Inside Unit 1 Containment," the three Containment Recirculation Air System smoke detectors were discovered to be inoperable. Subsequently, the Action Statement of Technical Specification 3.3.3.7 {

was entered and s station deviation report and work request were submitted.

The inoperable smoke detectors were replaced, satisfactorily tested, and returned to operable status at 1653 hours0.0191 days <br />0.459 hours <br />0.00273 weeks <br />6.289665e-4 months <br /> on June 2,1989. Because the performance of these detectors has been less than optimum, an engineering evaluation will be performed to assess the cause of failure and recommend corrective actions to prevent recurrence.

Should you have any questions or require additional information, please contact us.

Very truly yours, L

W. L. Stewart Senior Vice President - Power 8907100319 DR 99o627 ADOCK 0500o33s PNU hf

] (

i l

i

u.s.

w I,

r cc: U.S. Nuclear Regulatory. Commission

, Region 11 a~ "'

101 Marietta Street, N.W.

Suite 2900 U

Atlanta, Georgia 30323 s . Mr. J. L Caldwell .

NRC Senior Resident inspector North Anna Power Station 4

m- .A_-.--_-_-___--.------.-__.._