ML20206T986

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Rev 0 to Surveillance Procedure 6.4.1.8, Control Rod Drive Hydraulic Control Unit Accumulator Leakage Test
ML20206T986
Person / Time
Site: Cooper Entergy icon.png
Issue date: 08/28/1981
From: Creason R
NEBRASKA PUBLIC POWER DISTRICT
To:
Shared Package
ML20206T643 List:
References
6.4.1.8, TAC-54682, NUDOCS 8607080278
Download: ML20206T986 (7)


Text

. ' COOPER NUCLEAR STATION OPERATIONS MANUAL

  • CONTROL ROD DRIVE HYDRAULIC CONTROL UNIT St"tVELLLANCE PROCEDURE 6.4.1.8 ACCUMULATOR LEAKAGE TEST I. PURPOSE ,

To provide a detailed instruction for station personnel to perform a con-trol rod drive hydraulic control unit accumulator charging water check valve and scram inlet control valve leakage check.

II. DISCUSSION ,

The control rod drive hydraulic control units are charged to a pressure of 1400 to 1500 psig, providing a source of water to rapidly insert the con-trol rods upon a signal from both buses of the reactor protection system.

At high reactor pressures (N above 800 psig) the accumulator provides for a rapid initial insertion rate for the control rods. As the accumulator pressure approaches reactor pressure, the control rod insertion continues ,

by reactor pressure internally ported within the control rod drive.'

At reactor pressures above 800 psig, required control rod scram times may be met independent of accumulator action, .Below-800 psig reactor pressure, accumulator operation is necessary in or' der to meet the required control rod scram times.

The purpose of this surveillance procedure is to ensure control rod drive hydraulic accumulators are capable of staying pressurized for 20 minutes in the event of loss of capability to charge them, such as a loss of both control rod drive pumps for an extended period of time. A second purpose of this procedure is to determine the leakage path so that proper subse-quent repairs may be initiated and post maintenance Q.C. can be addressed.

III. REFERENCE MATERIAL A. SAR.

1. Volume I,Section III, Subsection 5.0.

1 B. Flow Diagrams, i l

1. B & R Drawing 2039; Control Rod Drive Hydraulic System. '

C. Vendor Manuals.

1. G.E. Operations and Maintenance Instruction GEK-9688, Volume III, l Part I, Subgroup; Control Rod Drive System.  !
2. Instruction Manual 66-31-24, GEK-9582A; Hydraulic Control Unit. -

i 8607080278 860630 '

gDR ADOCK 05000298 PDR Revised By/Date Reviewed By/Date ate Rev. Procedure Page 1 01 R. Creason 8/26/81 0 6.4.1.8 4 Pageo

( . Creason 8/6/81 -g *11 g f L

IV. PREREQUISITES A .' The reactor in cold shutdown condition..

B. The control rod drive hydraulic system in operation with no,rmal flows-and pressures established.

V. - LIMITATIONS A. Surveillance Requirements - Technical Specifications.

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None.

B. Administrative Limits. .

1. All discrepancies shall.be recorded in the Shif t Supervisor's log.
2. Attachment "A" shall be used to record the test and filed as.part
  • of the station records.

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3. Coordinate all testing with the Control Room,0perator.
4. This procedure shall be performdd"each plant refueling outage.

VI. PRECAUTIONS -

A. Any water drained from the control rod drive hydraulic accumulators or its piping should be considered radioactive and proper precautions to prevent spread of contamination observed.

VII. TEST EQUIPMENT A. Calibrated stopwatch.

VII

I. PROCEDURE

A. Identification Of Control Rod Drive Hydraulic Accumulators Which Leak Excessively.

1. Obtain the Shift Supervisor's permission to perform surveillance procedure.
2. Verify the control rod drive hydraulic control units accumulator nitrogen pressures are reading normal pressure between N 1090 and 1140 psig (refer to System Operating Procedure 2.2.8, Appendix C.

Figure II, Accumulator Recharge Pressure vs. Ambient Temperature).

Recharge any accumulators which are low per System Operating Pro- ,

cedure 2.2.8, Step VIII.E. -

3. With the control rod drive hydraulic system operating normally, secure the operating control rod drive hydraulic pump.

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Crnearlieen N..mbne AA 1 R lnoen . /-**I lDoutefon n lPnee- 2 of 4 Pame

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. 4. Utilizing a stopwatch, monitor the control, rod drive accumulator trouble alarm lights on panel 9-5 for 20 minutes.

a. Record the control rod drive accumulator alarms and the time req sired from securing of the control rod drive pump until the alarm lights illuminate, on Attachment "A" data sheet.

Note: An alternate method could be to monitor the local hy-draulic control units accumulator alarm panels lights.

5. Restart the control rod drive pump and return the control rod drive hydraulic system to' normal per System Operating Procedure 1 2.2.8, Step VIII.
6. Perform Section B., if necessary, to determine leakage path for those accumulators.

B. Determining Accumulator Leakage Paths. ,

1. With the control rod drive hydraulic system operating normally, 4 verify accumulator trouble alarm lights are all.off.' -
2. Close CRD-29, charging header rdot valve, and immediately secure the operating control rod drive hydraulic pump.

1

3. Utilizing a stopwatch, monitor the control rod drive accumulator
trouble alarm lights on panel 9-5 for 20 minutes. l
i j a. Record the control rod drive accumulator alarms and the time l required from closing CRD-29 and securing the control rod 1 drive pump until the alarm lights illuminate, on Attachment "A" data sheet.

Note: An alternate method could be to monitor the local hy-draulic control units accumulator alarm panels lights.

4. Open CRD-29 after 20 minutes.
5. Restart the control rod drive pump and return the control rod drive hydraulic system to normal per System Operating Procedure 2.2.8, Step VII. -
6. Notify the Shift Supervisor'when testing is complete.

t Note: Those hydraulic control units accumulators which failed .

to hold pressure during performance of Section VII.B. have leaking scram inlet control valves.

Those leaking hydraulic control units accumulators 1denti-

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fled in Section VIII.A. but did not leak down in Section i VIII.B. have leaking charging' water check valves.

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IX. ATTACllMENTS

' A. Control Rod Drive Hydraulic Control Unit Accumulator Leakage Test Data Sheets.

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,1 Drocedure Number 6.4.1.8 lDate .'P'il

-  ! Revision- 0 l Pane- 4 .of 4 Pagea)

COOPER NUCIL\R STATION OPERATIONS tlANUAL CONTROL ROD DRIVE HYDRAULIC CONTROL UNIT ATTACll!!ENT "A" SURVEILLANCE PROCEDURE 6.4.1.8 ACCUMULATOR LEAKAGE TEST A

PROCEDURE DATA CHECK A. Identification Of Leaking Accumulators. 122:*"*CCEE

1. Obtained permission to perform test.
2. Charged accumulators to normal (1090 to 1140 psig) .
3. Secured control rod drive charging pump and recorded time on X data sheet. .
4. Monitored control rod drives accumulator alarm lights for 20 Z ::*-= : E i minutes. i
a. Recorded accumulators which alarm and times on data sheet.
5. Restarted control rod drive system and returned to normal per X System Operating Procedure 2.2.8. ,
6. Performed Section B., if necessary.

B. Determining Accumulator Leakage Paths. X

1. System operating normally and accumulator alarm lights off. *
2. Closed CRD-29, secured control rod drive pump, and recorded 'X time on data sheet.
3. Ifonitored control rod drives accumulator alarm lights for 20 . X minutes. ___

! a. Recorded accumulators which alarm and times on data sheet.

4. Opene.d CRD-29 af ter 20 minutes.
5. Restarted control rod drive system and returned to normal per X System Operating Procedure 2.2.8.
6. Notified Shift Supervisor test is complete.

Acceptance Criteria: No accumulator alarms for 20 minutes.

Test Equipment Number

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e Proceclure Number 6.4.1.8 l Date v 7 '.< ! l Revision 0 l Pane 1 of 3 Panes

/ uit)t> t .K taut;i.e.An s ia n lista twi.KA t ttitis ttAt4uAt.

  • CONTROL ROD DRIVE IIYDRAULIC CONTROL UNIT JTIACJ; MENT "A" SURVEILLANCE PROCEDURE 6.4,1,8 ACCUMULATOR LEAKACE TEST TEST A TEST B TIME CRD PUMP SECURED: TIME CRD-29 AND CRD PUMP SECURED:

ACCUMULATORS TIME ACCUMULATORS TIME IN ALARM (XX-XX) (FOR 20 MINUTES) IN ALARM (XX-XX) (FOR 20 MINUTES)

Procedure Nunber 6.4.1.8 Date '. . TI nevision 0 Page 2 of 3 Pages

P COOPER 130CI.I'AR STATION OPERATIONS ttANUAL

  • CONTROL ROD DRIVE HYDRAULIC CONTROL UNIT ATTAQll!!ENT "A" SURVEILLANCE PROCEDURE 6.4.1.8 ACCUMULATOR LEAKAGE TEST -

Diecrepancies:

  • WP Operator / '

Date Shift Supervisor /, Pennission To Start Date Shift Supervisor / Tes: Complete And Reviewed Date Shift Supervisor / NCR Written If Required Date Work Item (s) Initiated If Required Reviewed By /

Date 9

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. 4-I 6.4.1.8-Procedure - tinnber lDate *

- -!! l Revision 0 l Pace 3 of 3 Pages-

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