ML20134L643

Special Rept:On 961010,OB Diesel Driven Fire Pump Was Declared Inoperable Due to Battery Voltage That Was Less than 24 Volts,Operating Rounds Require Battery Voltage to Be Greater than 24 Volts.Restored Power to Chargers on 961016

ML20134L643
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	11/13/1996
From:	Schwartz G COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9611210120
Download: ML20134L643 (3)

Text

. _ _, . .. . .. . _ . ..

o Commonwealth Edhon Company Zion Generating Station 101 Shiloh floulevard Zion. Il GXf/A2797 h! M 17 7162036 a

e November 13, 1996 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001

Subject:

OB Diesel Driven Fire Pump Inoperable Greater than Seven Days Zion Nuclear Power Station Unit I and Unit 2 NRC Docket No. 50-295 NRC Docket No. 50-304 The enclosed Special Report is being submitted to you pursuant to Zion's Administrative Technical Specifications Section 3.21.2.B, which requires submittal of a special report within thirty days.

Sincerely, i N72&

G. K. Schwp Station Manal;er Zion Station

Enclosure:

Special Report for Inoperability of the OB Diesel Driven Fire Pump cc: A. B. Beach - Region Ill Administrator j R. A. Westberg - Interim Zion Senior Resident Inspector l Office of Nuclear Safety -IDNS '

l Comed Document Control Desk - Licensing f q

'f,[0_E / q 9611210120 961113' PDR ADOCK 05000295 I S PDR A Unicom company j

E Enclosure Zion Station Special Report This report is submitted pursuant to the requirements of Administrative Technical Requirement 3.21.2.B. l On October 10,1996, the OB Diesel Driven Fire Pump was declared inoperable due to a battery I voltage that was less than 24 volts, operating rounds require the battery voltage to be greater than 24 volts. The battery voltage had settled at approximately 24 volts due to the power supplies for l

the battery chargers losing power during scheduled work on BUS 249. Power to the chargers j was restored on October 16,1996 and Electrical Maintenance (EM) was requested to perform l PT-32 (Containment Spray / Fire Pump Battery Record - Monthly Quarterly Equalize Charge For l Fire Pump Llatteries) to restore the OB Diesel Driven Fire Pump to operable. Following the performance of PT-32 on October 17,1996, it was identified that the specific gravities for all cells of the batteries were out the required acceptance criteria low. Operating was directed to place both battery banks on equalize charge in an attempt to bring the specific gravities up to specifications. Reperformance of the PT-32 on October 18,1996, found that the specific gravity readings for all the battery bank I cells had returned to normal except cell 12 and battery bank 2 all remained out of specification low. Following these results, it was decided by the Electrical  ;

System Engineering Group to replace both banks of batteries. Currently both battery banks have been replaced and EM's and Operating are in the process of restoring the OB Diesel Fire Pump to service.

l During the period of October 10,1996 to present, while the OB Diesel Driven Fire Pump was unavailable, normal fire protection water was provided by the station service water booster pumps. In the event that fire protection water system fails to maintain adequate pressure backup, supplies will be available in the following sequence:

1. Service Water Booster Pump (normal primary source);

2. 0A Motor Driven Fire Pump;

3. OB Diesel Driven Fire Pump (unavailable); and

4. Service Water Pumps via check valve OSW-0008.

The 0A Motor Driven Fire Pump and the Service Water Booster Pumps were available during this event. Alternate means of fire suppression include station fire fighting teams equipped with fire extinguishers and CO 2carts, and fire hydrants located by the west side of the West Service Building and by the East Training Building. These hydrants are supplied by the City of Zion Fire Water System and are completely independent of Zion Station's Fire Suppression System.

Based on the above considerations, the backup systems are adequate to provide for loss of OB Diesel Driven Fire Pump. As a result, no special procedures or additional equipment are required.

ZION SPECIAL REPORT DISTRIBUTION LIST cc: Station Manager Site Engineering Manager Operating Manager Administrative Operating Engineer Fire Marshal

. Regulatory Assurance Supervisor Regulatory Services Manager Nuclear Licensing Administrator Site Quality Verification Director Regulatory Assurance File Master File -

i l

i

.