ML20238C701

Proposed Tech Spec Page 5.1-2 Re Flood Protection Measures Periodic Drills

ML20238C701
Person / Time
Site:	Prairie Island
Issue date:	12/18/1987
From:	NORTHERN STATES POWER CO.
To:
Shared Package
ML20238C692	List: ML20238C690 ML20238C696 ML20238C701
References
NUDOCS 8712310169
Download: ML20238C701 (13)

Text

EXHIBIT B Prairie Island Nuclear Generating Plant License Amendment Reauest Dated December 18. 1987 Exhibit B consists of marked up pages of the Prairie. Island Technical Specifications showing the proposed changes listed below:

l EAES TS.S.1-2 1

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PDR ADOCK 05000282 1 p _

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l TS.S.1-2 I REV 00 11/11/05

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.I erection of flood protection panels and assure an orderly shutdown of the plant and protection of safety relcted facilities. This procedure will provide for progressive action levels to prevent the possibility of unsafe plant operation and will include requirements for periodic drill: :: :::t j flood protection measures, such as ;;;;ti ; f1;;d pr:::::ier ; ::4+.

The plant is designed for a design basis earthquake having a horizontal ground acceleration of 0.12g and an operational basis earthquake having a horizontal ground acceleration of 0.06g. An emergency procedure will be prepared in accordance with Specification 6.5.A.7 to define actions- l l required for earthquakes, including plant shutdown and inspection if an operational basis earthquake is measured at the site.

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References i 1. USAR, Section 2.2.1

2. USAR, Section 3.4.5

3. SER, Sections 2.3.4 and 2.3.5 t ._. _ _ _. _ _ _ _ _ - _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ -

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V EXHIBIT C Prairie Island Nuclear Generating Plant License Amendment Reauest Dated December 18. 1987 l

Exhibit C consists of retyped pages of the Prairie Island Technical Specifications showing the proposed changes listed below:

Page TS.S.1-2 l

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TS.5.1-2 REV erection of flood protection panels and assure an orderly shutdown of the plant and protection of snfety related facilities. This procedure will provide for progressive action levels to prevent the possibility of unsafe plant operation and will include requirements for periodic inspection of flood protection measures.

The plant is. designed for a design basis earthquake having a horizontal ground acceleration of 0.12g and an operational basis earthquake having a horizontal ground acceleration of 0.06g. An emergency procedure will be prepared in accordance with Specification 6.5.A.7 to define actions required for earthquakes, including plant shutdown and inspection ~if an operational basis earthquake is measured at the site.

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References

1. USAR, Section 2.2.1

2. USAR, Section 3.4.5

3. SER, Sections 2.3.4 and 2.3.5 I

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EXHIBIT D Prairie Island Nuclear Generating Plant License Amendment Reauest Dated December 18. 1987 Exhibit D consists of NSP Prairie Island Nuclear Generating Plant Procedure No. AB - 4, " Flood", Revision 4.

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AB-4 ,

. 'Rev. 4-Page 1 of,8 AB-4 FLOOD TABLE OF CONTENTS Page 2

1.0 GENERAL DISCUSSION . . . . . . . . . . . . . ...... .

.'. -2 2.0 SYMPTOMS . . . . . . . . . . . .. . ... . . ...

2 3.0 IMMEDIATE ACTION . . . . . . . . . . . . . . ......

. . .. . . . . . . . . . ...... 2 4.0 SUBSEQUENT ACTION .

3 A. Levels of 674 to 678 Feet . . . . . . - . . ....:.. . -l 3

B. Levels of 678 to 680 Feet . .. . . . ,, . . . . . - . . . . .

C. Levels of 680 to 683 Feet . . . . . . . . ......

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D. Levels of 683 to 685 Feet . . . . . . . . . . . . . .:.

E. Levels of 685 to 688 Feet . . . . . . . . ...... .5 5

F. Levels of 688 to 690 Feet . . . . . . . . ......

6 G. Levels of 690 to 692 Feet . . . . . . . . . . . . . . . .

6 H. Levels of 692 and Greater . . . . . . . . ......

. . . . . ... . . . . . . . . ...... 7 5.0 PRECAUTIONS i

TABLE: AB-1 Water and Plant Levels of Importance . . . .. 8 j i J,

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-l OC REVIEW DATE: /h. AB 63Gt  :

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' 6,4,W JN u a DATE: ~)o . a 3. B.;r i REVIEWED BY:  !

- APPROVED BY: , , </a .DATE: /d - 2 h D j

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1.0 GENERAL DISCUSSION This procedure deals with the actions to be taken for flood l

levels of 683 feet MSL* and higher. Floods of lower levels 1 are not considered emergency in nature, but are to be handled as abnormal operations. Preparations for high water levels must be initiated- at levels as low as 680 feet. Refer to i

Table AB-4-1 for levels that affect plant access and operation.  !

l In accordance with the Emergency Plan, flood levels of 686' ,

l 692', and 698' are classified as an Unusual Event, and Alert, and a Site Emergency, respectively. Refer to Emergency Plan F3.2 for additional instructions.

2.0 SYMPTOMS Due to the geographical nature of the area around the plant, I the probability of a flash flood is quite low. It is expected that plant personnel would be aware of the approach of a flood of 684 (or higher) several days or weeks before the water reached this neight. In general, the plant would be made aware of an emergency flood by the following:  :

1. Flood warnings will come from the weather bureau through news releases or from NSP Power Supply Office.

Based on previous history, the predictions of an impending flood are given before the snow melt has progressed to an appreciable amount or following extremely heavy rain. These predictions are made weekly, daily, and hourly as flood conditions warrant.

2. As water levels increase, the indicators on Control Room panel board and associated computer inputs will show increasing level.

1 3.0 IMMEDIATE ACTIONS

1. Automatic actions - none

2. Manual action - none 4.0 SUBSEOUENT ACTIONS l' 1. Plant Manager shall announce flood predictions when first received.

• MSL = 1929 adjusted mean sea level. All water heights referred to in this procedure are referred.to MSL.

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2. General Superintendent Plant Operations shall:

a. Remain in clese contact with NSP Power Production Office and Lockmaster, Lock & Dam #3 to determine expected flood crest, date of occurrence and duration.

b. Review following items and initiate action.

A. Predicted levels of 674 to 678 feet.

1. Increase surveillance of trash racks.

B. Predicted levels of 678 to 680 feet.

1. Item above.

2. Verify plant boat, motor, and trailer operable.

3. Verify all plant sump pumps operable. l

4. Increase surveillance of cooling tower pump house, screenhouse lower level, condenser pits of Turbine Building, RHR, aerated /non-aerated pits and gas decay condensate drain tank pit.

5. Verify valves closed in basement of ERAD Lab.

C. Predicted levels of 680 to 683 feet.

1. All of above.

2. Verify all fuel tanks full-order as necessary.

3. Contact Goodhue County Engineer to coordinate counties commitment to maintain roadway shoulders on CSAH 18 between Larson Lake and Vermillion River.

4. Select combination of gates to maintain smallest AH l possible.

NOTE: When discharge basin reaches 683'-0 (level of over flow section of discharge canal dike) water will bypass to river resulting in loss of discharge control. Log event and notify NSP-ERAD Dept.

D. Predicted levels of 683 to 685 feet.

1. All of above.

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2. Verify county commitment- to install posts for ~

marking ror.dway and to raise and maintain road surface to a level of 685 feet.

NOTE: At 684 feet approximately 800. feet of CSAH j 18 would be under water without diking and' raising surface.

3. Remove wood and other tower repair material stored-in field between towers.  :

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4. Remove fire hose from hydrants 11 thru 26.

5. Open tower bypass gates and remove: towers from l service.

l NOTE: If after April.1, notify ERAD Dept.

6. Open electrical breakers 1to tower fans, lights and-vibration equipment.

7. Open electrical breakers to all cooling tower pumps and associated equipment except sump and dewatering  !

pump (s).

8. Place. sand bags over cooling tower. pump suction-bay manway covers. (In cooling tower pump house)

9. Verify all cooling tower header dewatering valves are closed. Dewatering pump-can be used'for back up sump pump service.

10. Place portable sump pump (s) and hose in cooling.

l tower gump house, screenhouse, guardhouse basement and other low areas as needed.

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11. Verify additional 4 wheel drive or heavy duty- 1 trucks on-site.

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12. Proposed off-site parking area to be specified.

13. Remove all personnel and non-essential vehicles from site.

14. Implement plan to transport employees and other essential personnel across built up section'of road.

NOTE: Bus maybe necessary to transport personnel

' from CSAH 18 and railroad crossing to plant. . 1 l

15. Verify. plant amphibious vehicle is in ready condition.

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16. . Review essential materials and supplies (fuel oil gasoline, timber plywood, sandbags , ' sand, gasket material for building bulk heads, etc.')'and order as necessary.

17. Review need for large . capacity mobile crane.

NOTE: Will needc125 ton unit if levels of 694.or-greater are predicted.

18. At Intake Screenhouse

a. Stop traveling screens and associated pumps.

b. Open by-pass gates.

c. Open sluice gates.

d. Stop instrument. air compressor

e. Stop all their equipment operation.

f. Open electrical breakers to screenhouse equipment, devicing pump and sluice gates.

E. Predicted levels of 685 to 688 feet..

1. All of above.

2. Implement the Emergency Plan'(686').

3. Review transportation problem, high water will cover access road from "T" to railroad tracks. l

4. At 687, low spot in' road at Kinney's store will be underwater. County will maintain passage. j

5. Arrange for additional heavy duty boat (s) and/or amphibious vehicles. .

NOTE: (1) NSP PI Environmental Group has one large boat.

(2) Review need for life' jackets, order as needed.

6. Open electrical breakers'to radiation monitor house, tower bypass, recycle and discharge gates. <

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7. Remove / protect electrical motors / equipment ,

intake / discharge system as necessary.

I F. Predicted levels of 688 to 690 feet.

1. All of above.

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2. Remove electrical equipment from radiation _ monitor house. Close side vents and sandbags as necessary.

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3. Remove motor from circ system gate drive units.

4. Remove oil absorbent material'from east side of radiation monitor house.

5. Remove propane cylinders. from west sidet of radiation monitor house.

G. Predicted levels of 690 to 692 feet.

1. All of above.

2. At water level of 692 feet.. ,

a. Shutdown both units. '(T.S.6.5.A.7)-

b. Install temporary jumpers around the respective plant substations, . this will ensure offsite power to a flood level of'706 feet.

c. Review warehouse material and records that would require removal.

d. Review Record Management area for machines and-t records to be moved.

e. Review all exterior buildings, equipment, etc. j to formulate a plan for protection. J H. Predicted levels of 692 or greater.

1. All of above.

2. Review need to remove cooling tower pump motors and; other electrical equipment.

3. Sandbag top of cooling tower pump house. .

NOTE: Three feet of sandbags are maximum.

4. Sandbag doors into cire bay areas and safeguard areas of screenhouse.

5. Remove fire hose from all exterior hose stations.

6. Implement plan to protect all exterior. buildings

'" and equipment to large to move.

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7. All smaller equipment to be moved to Turbine

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8. Sandbag following buildings as necessary: '

Guardhouse, Security Emergency Diesel Generator Building, Deep Well Houses, Construction Office and-Records Room, Rad Waste / Resin Disposal Building, 1 Low Level Rad Waste Storage Building, Cooling Tower Substation / Equipment House, Cooling Tower {

Substation / Equipment House, Cooling Tower Control Houses, Oil Unloading House Neutralizing Tank House, STA/SEC Trailers, and the ground level window / door areas of Administration Building.

9. Install main building and Screenhouse bulk heads i except for one small personnel door and one rollup equipment door which maybe used until flood waters i preclude their use. Refer to SP 1293 Flood Preparation - Building Flood Control Panel Installation / Inspection.

NOTE: With bulk heads installed, provisions must I be made for entry into main building and screenhouse. Entry to Turbine Building would be through a second level window of f Entry to i the Administration Building.  !

Screenhouse may be over the roof and down through a equipment access hatch or in the dog house, remove a air intake damper into 12 diesel cooling water room.

5.0 PRECAUTIONS

1. If using the emergency cooling water intake line with river levels of 690 or greater, the discharge flow must be throttled to lowest flow possible before stopping a pump. Hydraulic forces have been calculated, that show sudden stopping of a pump will cause spillage of several thousand gallons of water on the screenhouse floor.

2. Outdoor lighting, security surveillance and other electrical equipment should have power out when flood waters reach the base of the respective fixtures.

3. Life jackets shall be worn and life lines with float rings accessable when in emergency vehicles or working near water.

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TABLE AB-4-1

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Water and Plant Levels of Importance

1. Highest level wave action analyzed for 706.7'

2. Flood wall protection around plant and screenhouse 704.0'

3. Highest level plant analyzed for 703.6'

4. Highest level transformers will function 698.0'

5. Ground floor in plant and screenhouse and roof of cooling tower pumphouse 695.0'

6. Grade level around main plant buildings 694.0'

7. 1000 year flood 693.5'

8. Reactor shutdown (T.S.6.5.A.7) 692.0'

9. Cire water system gate structure 688.3'

10. 1965 Floodlevel - Highest level recorded 688.3'

11. 150 year probability 688.1'

12. 100 year probability 687.4'

13. 1969 Floodlevel 686.6'

14. 50 year probability 686.0'

15. Floor level - Intake screehouse 685.0'

16. 1952 Floodlevel 684.68'

17. Guardhouse basement 684.3'

18. Cooling tower grade level and approximately 800 feet of CSAH 18 underwater 684.0'

19. Lowest point on CSAH 18 road 683.5'

20. Lowest level of containment 683.0'

21. De-icing pump house - pump pit 683.0'

22. 10 year probability 682.5'

23. Base level of neutralizing tank (12' dia) 682.0'

24. Spill over-CT pump suction basin to distribution 680.75' basin

25. Spill over distribution basin to river, pit. level of as decay condensate drain tank, and hose level of diesel fire pump fuel oil storage tank (6' dia.) 680.0'

26. Aerated /non-aerated tank (s) pit 679.25'

27. Turbine room condenser pit 679.0' '

28. Normal river level and cooling tower pump house walkway-north side 674.58 ,

29. Fuel oil storage tanks (heating boiler, diesel 674.0' generator & diesel cooling water pumps) base level 67 2 . 5 ' ..<,__. _

30. 11/21 cooling water pump trip-low water level 670.0'

31. Basement screenhouse 668.5'

32. Cooling tower pump house pit-south side 665.5'

33. River level on loss of Lock & Dam #3 (FSAR 2.7.4) 665.0'

34. RHR pit level 664,0'

35. Cooling water emergency intake crib (top) 660.0'

36. River bottom level at base of intake crib 655.75'

37. Condensate pump pit ]

NOTE: Due to hydraulic back pressure forces, the Vermillion River (cffects CSAH 18) will vary from 2" to 12" higher than the Mississippi River level. Per Lock Master Lock & Dam #3 ,

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