ML023290355

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Procedure RA-EP-02880 Internal Flooding Revision 02
ML023290355
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 11/05/2002
From:
FirstEnergy Nuclear Operating Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML023290355 (17)
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Text

(7 C Davis Besse Power Station Control Copy Number: 1665 Transmittal / Receipt Acknowledgement Transmittal Number: 0211-16388 Transmittal Date: 11-05-2002 To: DOC. CONTROL DESK Mail Stop I Address: USNRC DIVISION OF EMERGENCY PREPARDNESS WASHINGTON, D.C. 20555 Document holders are responsible for control and maintenance of documents in accordance with the actions specified by this transmittal. Outdated material shall either be removed and destroyed or marked to reflect that it is superseded or voided and is no longer considered controlled.

Note: Destroy Safeguard information by shredding.

File documents in tab order as identified on the Table of Contents Contact Document Control with any questions at (419)-321-7483 0

( C Control Copy Number: 1665 Davis Besse Power Station Transmittal Number: 0211-16388 Transmittal / Receipt Acknowledgement Transmittal Date: 11-05-2002 Document TC"V' 1 T("lF'7" T,.*,p Nhimh~r Sht/See Changes Rev -Status _

tMr, mr r1fl'M V1'1 old EPON PROC RA-EP-02880 0002 APPROVED new EPON PROC RA-EP-02880

Page 1 of 15 Davis-Besse Nuclear Power Station PROCEDURE RA-EP-02880 INTERNAL FLOODING REVISION 02 Prepared by: Wally Taylor Procedure Owner: Superintendent - Operations Support NOV 52002 Effective Date:

LEVEL OF USE:

Procedure Classification:

STEP-BY-STEP X Safety Related Quality Related Non-Quality Related

2 RA-EP-02880 of Revision 02 INTERNAL FLOODING TABLE OF CONTENTS Page 1.0 PU R POSE ..................................................................................................................................... 3

2.0 REFERENCES

............................................................................................................................. 3 3.0 DEFIN IT ION S ............................................................................................................................. 3 4.0 RESPONSIBILITIES .............................................................................................................. 3 5.0 INITIATING CONDITIONS .................................................................................................. 3 6.0 PROCEDURE .............................................................................................................................. 4 6.1 Flooding in Areas that Affect Safe Shutdown Systems ............................................. 4 6.2 Flooding in All Other areas ........................................................................................ 4 6.3 - Cleanup of the Affected Areas .................................................................................... 5 6.4 Equipment restoration ................................................................................................ 5 7.0 FINAL CONDITIONS ............................................................................................................ 6 8.0 RE C O RD S.................................................................................................................................... 6 ATTACHMENT 1: FLOODING AFFECTING THE SERVICE WATER PUMP ROOM .......... 7 A'1TTACHMENT 2: FLOODING AFFECTING THE CCW PUMP ROOM ................................. 10 ATTACHMENT 3: FLOODING AFFECTING THE ECCS ROOMS .......................................... 12 ATTACHMENT 4: POTENTIAL SOURCES OF INTERNAL FLOODING ............................... 14 ATLTACHMENT 5: PIPE TUNNEL DRAINS ARRANGEMENT ................................................ 15

-3 RA-EP-02880 Revision 02 1.0 PURPOSE This procedure provides guidance for actions to be taken for internal flooding incidents.

2.0 REFERENCES

2.1 Developmental 2.1.1 Assessment of the Internal Flood Hazard for the Davis-Besse Nuclear Power Station, SAROS, September 1989.

2.1.2 INPO SOER 85-5, Internal Flooding of Power Plant Buildings, December 30, 1985.

2.2 Implementation 2.2.1 RA-EP-01500, Emergency Classification 2.2.2 RA-EP-02720, Recovery Organization 3.0 DEFINITIONS 3.1 INTERNAL FLOODING - Flooding that occurs from breaches of water systems that are located inside plant buildings and are connected to large water sources such as Intake Forebay or tanks.

4.0 RESPONSIBILITIES 4.1 The Shift Manager shall implement this procedure in the event of internal floodmg that constitutes a threat to:

  • Power production capability 5.0 INITIATING CONDITIONS .

This procedure shall be implemented upon Control Room identification of internal flooding incidents that exceed the existing Station Drainage System's removal capability AND constitutes a threat to:

(1) Personnel Safety, or (2) Safe Shutdown capability, or,(3) Power production capability.

4 RA-EP-02880 Revision 02 6.0 PROCEDURE 6.1 Flooding in Areas that Affect Safe Shutdown Systems 6.1.1 Service Water Pump Room and Adjacent Areas; GO TO ATI'ACHMENT I, FLOODING AFFECTING THE SERVICE WATER PUMP ROOM.

6.1.2 Component Cooling Water Pump Room; GO TO ATTACHMENT 2, FLOODING AFFECTING THE CCW PUMP ROOM.

6.1.3 Emergency Core Cooling System room(s); GO TO ATTACHMENT 3, FLOODING AFFECTING THE ECCS ROOMS.

6.2 Flooding in All Other areas 6.2.1 Symptoms

"* High sump level alarms.

"* High flow (low pressure) indicati*ns for affected systems.

"* Automatic system response to high flow rates.

  • High or low tank level indications.

WARNING 6.2.2 Advise operators to use extreme caution when opening doors leading to rooms with potential internal flooding.

NOTE 6.2.2 Attachment 4 contains the areas analyzed to be susceptible to internal flooding.

6.2.2 Determine the source of flooding, REFER TO ATTACHMENT 4, POTENTIAL SOURCES OF INTERNAL FLOODING.

  • Monitor Control Room indications to assist in identifying the flooding source.
  • Dispatch an operator to investigate the source of the problem.

5 RA-EP-02880 Revision 02 NOTE 6.2.3 The desired method of isolation will vary with the leak location and rate of leakage. Drastic actions may be required.

6.2.3 Leak isolation may be performed by:

    • Manual or remote isolation of affected piping.
  • Shutdown of pumps "NOTE6.3 Water to be removed after a flooding incident may be contaminated, contain oil, or other chemicals subject to legal release limitations.

6.3 Cleanup of the Affected Areas 6.3.1 IF the water to be removed is:

  • Potentially contaminated
  • Contains oil
  • Contains other chemicals subject to legal discharge limits, THEN notify Radiation Protection and/or Chemistry to obtain assistance in determining how to dispose of the water and determine if external notifications are required.

6.3.2 Notify Maintenance if additional resources are required to remove the water and/or clean the area.

6.3.3 Notify the appropriate maintenance group to inspect equipment that appears to have been submerged or sprayed during the incident.

6.4 Equipment restoration 6.4.1 WHEN potentially effected equipment has been inspected and released by the responsible organizations, THEN return the equipment to service as necessary.

6 RA-EP-02880 Revision 02 7.0 FINAL CONDITIONS Use of this procedure shall be terminated when:

7.1 The flooding condition has been corrected, cleanup is completed, and necessary equipment is restored or removed from service for corrective maintenance.

or 7.2 Cleanup and restoration is being conducted as a part of RA-EP-02720, Recovery Organization.

80 RECORDS 8.1 The following quality assurance records are completed by this procedure and shall be listed on the Nuclear Records List, captured and submitted to Nuclear Records Management in accordance with NG-NA-00106:

8.1.1 None 8.2 The following non-quality assurance records are cbmpleted by this procedure and shall be listed on the Nuclear Records List, captured and submitted to Nuclear Records Management in accordance with NG-NA-00106:

8.2.1 None

S7 RA-EP-02880 Revision 02 ATTACHMENT 1: FLOODING AFFECTING THE SERVICE WATER PUMP ROOM Page 1 of3 1.0 Symptoms 1.1 High sump level alarm from:

1.1.1 Diesel fire pump room 1.1.2 Service water valve room 2 1.2 High flow (low pressure) indications for affected systems:

-1.2.1 Service water system 1.2.2 Water treatment system 1.3 System's automatic response tohigh flow rates (low pressure):

1.3.1 Fire suppression system Auto. pump start(s) 1.3.2 Cooling tower pump trip t " I 1.3.3 Service water isolation of secondary loads 2.0 Determination of the flowing source 2.1 Monitor Control Room indications to assist in identifying the flooding source.

2.2 The following areas have the potential to flood the Service Water Pump Room.

-2.2.1 -Room 51, Diesel fire pump room flooding sources:

  • Fire suppression piping
  • Screen wash Piping 2.2.2 Room 52, Service water pump room flooding sources:

Service water piping

  • Fire suppression piping

8 RA-EP-02880 Revision 02 ATTIACHMENT 1: FLOODING AFFECTING THE SERVICE WATER PUMP ROOM (Continued)

Page 2 of 3 2.2.3 Room 53, Service water valve room flooding sources:

  • Fire suppression piping
  • Water treatment piping

2.3 Dispatch an operator to investigate the source of the problem.

3.0 Isolation of the flooding source NOTE 3.1 The desired method of isolation will vary with the leak location and rate of leakage. Drastic actions may be required.

3.1 Leak isolation may be performed by:

  • Manual or remote isolation of affected piping
  • Shutdown of pumps 3.2 Non-isolable flooding may occur in the service water valve room. A break in the service water return line piping may result in back leakage from the forebay or intake structure.

9 RA-EP-02880 Revision 02 ATFACHMENT-I: -FLOODING AFFECTING THE SERVICE WATER PUMP ROOM (Continued)

Page 3 of 3 NOTE 3.3 For the maximum postulated flood it will take approximately 20 minutes to reach the level at wvhich drain plugging is not feasible.

3.3 WHEN the flooding is in the service water valve room, THEN plug the floor drains in the service water pump room and the diesel fire pump room.

REFER TO Attachment 5, Pipe Tunnel Drain Arrangement.

3.4 REFER TO RA-EP-01500, Emergency Classification, to determine any required Emergency Action Levels.

3.5 For plant restoration GO TO Step 6.3.

. I

10 RA-EP-02880 Revision 02 ATTACHMENT 2: FLOODING AFFECTING THE CCW PUMP ROOM Page 1 of 2 1.0 Symptoms 1.1 High/low tank level alarm from:

1.1.1 Miscellaneous Waste Drain Tank (high) 1.1.2 CCW surge tank (low) 1.2 High flow (low pressure) indications for affected systems:

1.2.1 Service Water system 1.2.2 Component Cooling Water system 1.3 System's automatic response to high flow rates (low pressure):

1.3.1 Fire suppression system Auto pump start(s) 1.3.2 Service water isolation of secondary loads 1.4 Automatic header isolation due to lowering CCW surge tank level.

2.0 Determination of the flooding source 2.1 Monitor Control Room indications to assist in identifying the flooding source.

NOTE 2.2 The CCW System has detectable activity, RP assistance may be required.

2.2 The following systems have the potential to flood the CCW Pump Room:

  • Component Cooling Water system
  • Fire Protection system

11 RA-EP-02880 Revision 02 ATTACHMENT 2:. FLOODING AFFECTING THE CCW PUMP ROOM (Continued)

Page 2 of 2 WARNING 2.3 Advise operators to use extreme caution when opening doors leading to rooms with potential internal flooding.

2.3 Dispatch an operator to investigate the source of the problem.

I -I I 3.0 Isolation of the flooding source NOTE 3.1 The desired method of isolation will vary with the leak location and rate of leakage. Drastic actions may be required.

3.1 Leak isolation may be performed by:

  • Manual or remote isolation of affected piping
  • Shutdown of pumps 3.2 REFER TO RA-EP-0 1500, Emergency Classification, to determine any required Emergency Action Levels.

3.3 For plant restoration GO TO Step 6.3.

12 RA-EP-02880 Revision 02 ATTACHMENT 3: FLOODING AFFECTING THE ECCS ROOMS Page 1 of 2 1.0 Symptoms 1.1 High sump level alarm from:

1.1.1 ECCSrooml 1.1.2 ECCSroom2 1.1.3 Decay Heat Cooler pit 1.2 High/low tank level alarm from:

1.2.1 Miscellaneous Waste Drain Tank (high) 1.2.2 CCW surge tank (low) 1.2.3 BWST (low) 1.3 High flow (low pressure) indications for affected systems:

1.3.1 Service water system 1.4 System's automatic response to high flow rates (low pressure):

1.4.1 Fire suppression system Auto pump start(s) 1.4.2 Service water isolation of secondary loads.

1.5 Automatic non-essential header isolation due to lowering CCW surge tank level.

2.0 Determination of the flowing source 2.1 Monitor Control Room indications to assist in identifying the flooding source.

NOTE 2.2 Contamination is likely in these rooms, RP assistance will be required.

2.2 The following systems have the potential to flood the ECCS Pump Room:

  • Borated Water Storage Tank system
  • , Component Cooling Water system
  • Fire Protection system

I RA-EP-02880 13 Revision 02 ATTACHMENT 3: FLOODING AFFECTING THE ECCS ROOMS (Continued) i Page 2 of 2 WAING 2.3 Advise operators to use extreme caution when opening doors leading to rooms with potential internal flooding.

2.3 Dispatch an operator to investigate the so'urce of the problem'.

3.0 Isolation of the flooding soure'e ,+

'NOTE3.1 ' - -

The desired method of isolation will varywith the leak l9cation and rate of leakage. Drastic actions may be required.

3.1 Leak isolation may be performed by:

Manual or remote isolation of affected piping.

Shutdown of pumps 3.2 REFER TO RA-EP-01500, Emergency Classification, to determine any required Emergency Action Levels.

3.3 For plant restoration GO TO Step 63

-+* i I;-

14 RA-EP-02880 Revision 02 ATTACHMENT 4: POTENTIAL SOURCES OF INTERNAL FLOODING Page 1 of 1 SCRN MFW & MN ROOM # ROOM NAMES SW WASH FP BWST COND DW STM MAKEUP CCW DH CW 50 Screen Pump Room X X X 101 Pipe Tunnel x 208 Mechanical Penetration Room No. 1 X X 209 Corridor to Mechanical Penetration Room No. 1 X X X X 225 Make-up Pump Room X X 227 Passage to Mechanical Penetration Room No. 2 X 236 Mechanical Penetration Room No. 2 X X 237 Auxiliary Feed Pump Room No. 1 X X 238 Auxiliary Feed Pump Room No. 2 X X 240 Boric Acid Addition Tanks Room X 252 Main Feedwater Pumps Room (West Condenser Pit) X 253 Condensate Pumps Pit X 260 Circ Water Pump House Substructure Area X

303 Mechanical Penetration Room No. 3 X X 304 Corridor to Mechanical Penetration Room No. 3 X X X 312 Spent Fuel Pool Pump Room X 314 Mechanical Penetration Room No. 4 X X X" X 318 Emergency Diesel Generator Room No. 1 X X 319 Emergency Diesel Generator Room No. 2 X X

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( (7 (C 15 RA-EP-02880 Revision 02 ATTACHMENT 5: PIPE TUNNEL DRAINS ARRANGEMPNT Page 1 of 1 rl 14 Floor Drain (8)

  • Equipment Drain (1) lnI F-I If o Plugs and 0 ExI o Tools SWP # 1 CTMU # 1 SW#3 CTMU#2 SWP#2 U]

U] N I. ___________________ .1i-I ____________________________________ I U _________________________________ J

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