ML20028G973

LER 89-036-01:on 891122,determined That HPCI Sys Inoperable Due to Inoperable Gland Seal Condenser Blower Motor.Caused by age-related Wear of Motor.Blower Motor Replaced & Blower Tested W/Satisfactory results.W/900920 Ltr

ML20028G973
Person / Time
Site:	Pilgrim
Issue date:	09/20/1990
From:	Bird R, Mcelhinney T BOSTON EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
90-111, LER-89-036, LER-89-36, NUDOCS 9010050021
Download: ML20028G973 (5)

Text

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Pilgnm Nuclear Pour station Rocky Hill Road Plymouth, Massachusetts 02360 Ralph G. Bird senior Vice President - Nuclear September 20, 1990 BECo Ltr.90-111 U.S. Nuclear Regulatory Commission Attn: Document Control Desk

'i4ashington, D.C. 20555 Docket No. 50-293 License No. DPR

Dear Sir:

The enclosed supplemental Licensee Event Report (LER) 89-036-01, "High Pressure Coolant Injection System Inoperable Due to Inoperable Gland Seal Condenser Blower Motor", is submitted in accordance with 10 CFR Part 50.73.

Please do not hesitate to contact me if there are any questions regarding this report.

,E M R. G. ird TM/bal

Enclosure:

LER 89-036-01 cc:. Mr. Thomas T. Martin Regional Administrator, Region I

'U.S. Nuclear Regulatory Commission 475 Allendale Rd.-

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On November 22, 1989 at 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br />, the High Pressure Coolant Injection (HPCI)

System was declared inoperable and a seven day Technical Specification (3.5.C.2)

Limiting Condition for Operation (LCO) was entered at that time.

The system was declared inoperable because the HPCI System turbine gland seal condenser blower motor did not start when the blower's control switch was moved to the START position in accordance with procedure. The blower motor did not start because of worn motor brushes, which resulted from motor shaft play. The motor shaft play was due-to age-related wear of the motor. The blower motor, installed during original construction (circa 1970), was manufactured by the General Electric Company and is a 250-VDC motor, model number 5BCJ56EA58.

The blower motor was replaced and the blower Las subsequently tested with s6tisfactory results. The HPCI System was declared operable on November 26, 1989 at 1925 hours0.0223 days <br />0.535 hours <br />0.00318 weeks <br />7.324625e-4 months <br />. The preventive maintenance program has been modified to include periodic brush replacement for the HPCI blower motor and for other motors used in similar applications.

This event occurred during power operation with the reactor mode selector switch in the RUN position. The reactor power level was 94 percent. The Reactor Vessel (RV) pressure was 1024 psig with the RV water temperature at 547 degrees Fahrenheit.

This report is submitted in accordance with 10 CFR 50.73(a)(2)(v)(D) and this ev a t posed no threat to the public health and safety.

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REASON FOR SUPPLEMENT This supplement meets the previous commitment to identify the results of the investigation regarding the wear of the HPCI System turbine gland seal condenter blower motor brush. The investigation had not been completed when the initial report was submitted.

l EVENT DESCRIPTION On November 22, 1989 at 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br />, the High Pressure Coolant Injection (HPCI) f System was declared inoperable and a seven day Technical Specification (3.5.C.2)

Limiting Condition for Operation (LCO) was entered. The HPCI System was declared inoperable because the HPCI System turbine gland seal condenser (GSC) blower did not start when its control switch was moved to the START position.

Prior to the event, the Control Room Panel C-903C alarm, "HPCI Turbine Exhaust Hi Drain Pot Level", annunciated. In accordance with Alarm Response Procedure ARP-903C (Rev. 2), the GSC blower (P-223) was to be started and run until the alarm cleared. However, the alarm did not clear after the blower's control switch was moved to the START position. Subsequent investigation revealed that the alarm did not clear because the condensate level in the GSC was not lowered. The HPCI System was conservatively declared inoperable in accorjance with the Administrative Limits of procedure 2.2.21 (Rev. 35), "(HPCI) System", for an inoperable GSC.

Failure and Halfunction Report 89-453 was written to document the event. The NRC Operations Center was notified as required by 10 CFR 50.72 on November 22, 1989 at 1018 hours0.0118 days <br />0.283 hours <br />0.00168 weeks <br />3.87349e-4 months <br />.

This event occurred during power operation with the reactor mode selector switch in L the RUN position. The reactor power level was approximately 94 percent. The Reactor Vessel (RV) pressure was approximately 1024 psig with the RV water ]

temperature at approximately 547 degrees Fahrenheit.

CAUSE

The GSC blower motor did not start when the blower's control switch was moved to the START position because of N rn motor brushes. Following replacement of the GSC.

blower motor, a visual inspect. a revealed that both of the motor brushes were worn with one brush worn considerably more than'the other brush. The wear exhibited by the brushes resulted from motor shaft play. The GSC motor was installed during l

original construction (circa 1970). The motor manufacturer was contacted regarding

'the as-found conditions, and indicated that the motor shaft play was due to ,

age-related wear of the motor. The GSC blower motor was manufactured by the  !

L General Electric Company and is a 250 VDC motor, model number SBCJ56EA58.  !

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0l1 0l3 or 0l4 tm . ., . ,, - c, - .,nn CORRECTIVE ACTION The HPCI System GSC blower (P-223) motor was replaced and the blower was tested with satisfactory results. For the blower motor replacement, the HPCI System turbine steam supply valve (MO-2301-3) was closed and de-energized, and the control switch for the auxiliary oil pump was placed in the pull-to-lock position. Post work testing of the GSC blower was completed with satisfactory results on November 26, 1989 at approximately 1615 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.145075e-4 months <br />. The HPCI System was restored to normal standby service and declared operable on November 26, 1989 at 1925 hours0.0223 days <br />0.535 hours <br />0.00318 weeks <br />7.324625e-4 months <br /> and the seven day LCO was terminated at that time.

The preventive mairitenance program was modified to include the HPCI System GSC blower (P-223) motor itnd condensate pump (P-220) motor, and the RCIC System barometric tondenser vacuum pump (P-222) motor and condensate pump (P-221) motor.

Initially, ti.e brushes for these motors will be replaced on a once-per-refueling outage frequency. The frequency may be changed in accordance with preventive maintenance prog.am procedure 3.M.1-1, " Preventive Maintenance".

An Engineering Service Request (ESR 89-881) was written to determine the nud to declare the HPCI System turbine GSC inoperable due to an inoperable GSC blower.

This item is under investigation.

During the period that the HPCI System was inoperabic, appropriate LC0 testing was conducted in accordance with Procedure 8.5.4.5 (Rev. 6), "HPCI System Inoperable".

The procedure includes operability testing of the Reactor Core Isolation Cooling

-(RCIC). System, Automatic Depressurization System (ADS), Core Spray System (CSS),

and the Low Pressure Coolant Injection (LPCI) mode of the Residual Heat Removal (RHR) System.

SAFETY CONSEOUENCES This event posed no threat to the public health and safety.

The HPCI System GSC blower (P-223) is controlled manually or automatically, and is normally in standby service with its control switch in the AUTOMATIC position.

Routine operability testing of the HPCI System is conducted in accordance with the surveillance program. The testing is performed in accordance with procedures that include procedure 8.5.4.1, "(HPCI) System Pump and Valve Monthly / Quarterly Operability". The procedure includes operating the GSC blower during the test.

The function and control of the Reactor Core Isolation Cooling (RCIC) System barometric condenser vacuum pump (P-222) is similar to the HPCI System GSC blower (P-223). Routine operability testing of the RCIC System is similar to the HPCI System and is performed in accordance with procedures that include procedure 8.5.5.1, "RCIC Pump Operability Flow Rate and Valve Test at 1000 PSIG". The procedure includes operating the barometric condenser vacuum pump (P-222) during toe test.

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0l1 0l4 oF 0 l4 nnw m e.,.e m ucwmuerun The LCO testing performed while the HPCI System was inoperable included operability testing of the RCIC System, ADS, CSS, and the RHR System /LPCI mode. The RCIC System was capable of providing high pressure cooling water to the Reactor Vessel while the HPCI System was inoperable. In the unlikely event that a RCIC System failure were to occur when its operation was needed while the HPCI System was inoperable, an automatic (or manual) actuation of the ADS would reduce the Reactor Vessel pressure for low pressure cooling provided independently by the CSS and RHkS/LPCI mode.

This report is submitted in accordance with 10 CFR 50.73(a)(2)(v)(D) because the HPCI System was declared inoperable.

SIMILARITY TO PREVIOUS EVENTS A review was conducted of Pilgrim Station Licensee Event Reports (LERs) submitted since January 1984. The review focused on LERs submitted in accordance with 10 CFR 50.73(a)(2)(v) that involved the HPCI System turbine GSC blower or GSC condensate pump. The review identified a similar problem with the HPCI System turbine GSC blower motor brushes that was reported in LER 50-293/89-025-00.

For LER 89-025-00, the HPCI System was declared inoperable on August 5, 1989 while operating at 50 percent reactor power. The system was declared inoperable because the HPCI System turbine GSC blower did not start when the blower's control switch was moved to the START position in accordance with procedure. The cause was normal age-related wear of the GSC blower motor brushes. The motor brushes were replaced. In retrospect, the motor shaf t play identified in this LER may have been a contributing cause to the August 5, 1989 event.

ENERGY INDUSTRY IDENTIFICATION SYSTEM (EIIS) CODES The EIIS codes for this report are as follows:

COMPONENTS CODES Alarm, Level LA Blower (P-223) BLO Motor M0 Condenser (Gland Seal Condenser) COND SYSTEMS Core Spray System (CSS) BM High Pressure Coolant Injection (HPCI) System BJ Integrated Control System (ADS) JA Panels System (C-903) JL Reactor Core Isolation Cooling (RCIC) System BN Residual Heat Removal (RHR) System B0 gag.o . .

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