ML20035A400
| ML20035A400 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 03/19/1993 |
| From: | Boulette E BOSTON EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 93-037, 93-37, NUDOCS 9303260009 | |
| Download: ML20035A400 (2) | |
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BOSTON EDISON higom Nuclem Powe' StatKm Hocky Hiil Road FWmouth, Masuchuwits,02360 March 19, 1993 BECo Ltr.93-037 E. T. Boulette, PhD senor vce Preudent-Nucieaf U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Docket No. 50-293 License No. DPR-35 This report is submitted in accordance with the Pilgrim Nuclear Power Station Final Safety Analysis Report, section 10.8.4.2.1.
The Fire Water Supply System Diesel Fire Pump (DFP) was removed from service for maintenance on February 16, 1993, at 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> and could not be returned to an operable status within seven days.
Please refer to Attachment I for further details.
The DFP was repaired and declared operable on March 4, 1993, at 0811 hours0.00939 days <br />0.225 hours <br />0.00134 weeks <br />3.085855e-4 months <br />.
Please do not hesitate to contact me if there are any questions regarding this i
subject.
Sh.kED hs
. )n E. T. Boul tt 8
RAG /bal cc:
Mr. Thomas T. Martin Regional Administrator, Region I U.S. Nuclear Regulatory Commission i
475 Allendale Rd.
King of Prussia, PA 19406 Mr. R. B. Eaton Div. of Reactor Projects 1/II Office of NRR - USNRC One White Flint North - Mail Stop 14D1 j
11555 Rockville Pike Rockville, MD 20852 Sr. NRC Resident Inspector - Pilgrim Station j
i I
9303260009 930319 fl; PDR ADOCK 05000293 S
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ATTACHMENT 1 i
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BostonEd[sonCompany Docket No. 50-293 Pilgrim Nuclear Power Station License No. DPR-35 The water supply to the Fire Suppression System is delivered by either the Diesel Fire Pump (DFP) or the Electric Fire Pump (EFP).
The DFP is redundant to the EFP and is available for standby and emergency service (loss of AC power to the EFP). The EFP and DFP are each rated at 2000 gallons per minute and discharge to the common 12" Fire Suppression System header at 125 psi.
On February 16, 1993, at 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br />, the Diesel Fire Pump was removed from service for planned maintenance.
PNPS Procedure 1.2.2, " Administrative Ops Requirements", allows entry into a Limiting Condition for Operation during plant operations for planned maintenance that improves equipment reliability.
The planned maintenance for the Diesel Fire Pump included a complete engine overhaul expected to last for approximately two weeks.
As a result, the Diesel Fire Pump was not returned to operable status within seven days as required by the final Safety Analysis Report, section 10.8.4.2.1.
Limiting Condition for Operation A93-23 was written to track the DFP overhaul.
During the period the Diesel Fire Pump was inoperable, weekly surveillance testing of the Electric Fire Pump was conducted with satisf actory results, except for the surveillance test performed on February 26, 1993, at 2140 hours0.0248 days <br />0.594 hours <br />0.00354 weeks <br />8.1427e-4 months <br />. The Electric Fire Pump failed to meet the 2000 gallons per minute surveillance requirement in accordance with Procedure 8.B.1, (Rev. 35), " Fire Pump Test" Instrumentation and controls personnel calibrated flow indicator FI-4680 and the surveillance test was re-performed with satisfactory results on February 27, 1993, at 0457 hours0.00529 days <br />0.127 hours <br />7.556217e-4 weeks <br />1.738885e-4 months <br />. We believe t he flow requirements for the Electric Fire Pump were met during the initial surveillance performed on 2/27/93 and flow indicator FI-4680 was in need of minor adjustment.
During the time the Electric Fire Pump was out-of-service, the Pilgrim Station fire truck was connected to the town water supply hydrant for backup service.
These measures were consistent with Procedure 2.4.54, " Loss of all Fire Suppression Pumps or loss of Redundancy in the Fire Water Supply System". The procedure outlines immediate and subsequent operator actions including measures to be taken when a loss in redundancy of the Fire Suppression System pumps occurs.
The measures are commensurate with the degree of loss of redundancy and are determined by the Watch Engineer in consultation with the Fire Protection and Prevention Officer (FPPD) or desigr.ee.
The Diesel Fire Pump overhaul was completed on March 3, 1993.
The Diesel Fire Pump subsequently passed surveillance testing with satisfactory results and was declared operable on March 4,1993, at 0811 hours0.00939 days <br />0.225 hours <br />0.00134 weeks <br />3.085855e-4 months <br />.
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