ML20054K036

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Offnormal Event Procedure 05-1-02-VI-1, Flooding, Safety-Related, Revision 10
ML20054K036
Person / Time
Site: Grand Gulf  Entergy icon.png
Issue date: 03/22/1982
From:
MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML20054J949 List:
References
05-1-02-VI-1, 5-1-2-VI-1, NUDOCS 8206300323
Download: ML20054K036 (3)
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'* PLANT OPERATIONS MANUAL

' 05-1-02-VI-I volume 05 Section 02 Revision: 10 f Date: 3-22-82 i

OFF-NORMAL EVENT PROCEDURE i

FLOODING SAFETY RELATED g?'s Prepared: t #1( .uw Rev tewed : - /!

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Nuclear Plant Quality' Superintendent , Technical Review Reviewed : C/h Operatijns Superintendent Approved:

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Assistant Plant Manager PSRC: ,

7 u List of Ef fective Pages:

Page: Revision:

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8206300323 820625 -

PDR ADOCK 05000416 P PDR l

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  • e GRAND GULF NUCLEAR STATION OFF-NORMAL EVENT PROCEDURE l

Title:

Flood ing (No.: 05-1-02-VI-I 1 Revis ion:' 10 iPage: 1 l l l l I I O

1.0 PURPOSE / DISCUSSION 1.1 The purpose of this procedure is to describe the actions to be taken in the event of plant flooding caused either by natural phenomena, such as storms or high water, or by system rupture.

1.2 This procedure may interface with Emergency Plan Procedure 10-S-01-10, Natural Occurrence, and other Emergency Plan Procedure.

l 1.3 The plant safety-related facilit ies, systems , and equipment are capable of withstanding the worst flooding caused by a combination of several i hypothet ical events. The most se r ious natural flood event is the potent ial flooding caused by the probable maximum precipitat ion on the i plant site and the watersheds for the two local streams. Adequate provision is made to safely carry away the runof f resulting from the probable maximum precipitation on the plant site without flooding the plant safety-related structures. The plant site is considered a dry site because the plant grade elevat ion (132. 5 ft . ) is about 30 feet higher i than the probable maximum flood level of the Mississippi River.

i The most serious pipe failure-related flooding that is postulated to occur is a severance of the Circulating water piping in the Turbine Build ing. If both Unit I and Unit 2 circulating water piping ruptured, a f g) maximum of 21.8 million gallons would flood the Turbine Building, (f Radwaste Buidling, and Control Building to a maximum of 109'0", assuming no operator act ion. The Auxiliary Building is watertight up to elevation 109'0" and all safety related equipment in the the control building is located above elevation 113'0", so no safety related equipment would be damaged. To mitigate the consequences of Plant flooding of this magnitude, the operator should trip the af fected Circulating Water Pump (s) if this accident were to occur.

2.0 SYMPTOMS li 2.1 News or weather reports indicate possible flooding in the site area.

2.2 General flooding is observed (inside or outside the plant).

. 2.3 One or more of the floor or equipment drain sump high-high level alarms

! may actuate due to excessive in-leakage or flooding beyond the capacity of the sump pumps.

3.0 AUTOMATIC ACTIONS 3.1 Floor drain sump pumps start to control sump levels.

4.0 IMMEDIATE OPERATOR ACTIONS 4.1 If flooding is due to pipe rupture or equipment fa ilure , take steps necessary to secure equipment and isolate leaks. Re fer to appropriate

(' ONEP for loss of plant cooling water systems , air systems , or condensate.

P

  • ^* GRAND GULF NUCLEA.R STATION OFF-NORMAL EVENT PROCEDURE lT it le : Flooding INo.: 05-1-02-VI-1 l Revis ion: 10 lPage: 2 l I I I I

{ l .

i I (7s 4.2 If flooding is occurring in the condenser bay area, monitor circulat ing

' water system basin level (on 1H13-P870) and C1g Tur Loop A/B Flo Lo Alarm on 1H13-P680 to determine if flooding is from the circulating water i system. If so, the circulating water pump (s) should be tripped and the

, discharge valve verified closed to prevent major plant flood ing. Re fe r A to ONEP 05-1-02-V-8, Loss of Condenser Vacuum, if the circulating water pumps are tripped.

e 5 4.3 Take steps necessary to protect fac ilit ies , personnel, and equipment j from water damage.

4.4 If flooding due to natural phenomena or system rupture threatens the j plant below grade elevat ions , ensure t' e following water-tight doors are

, closed:

f HPCS Pump Room 4

Auxiliary Building Access Door, elevation 93' .

,$ 4.4 Notify the Shif t Supervisor /Shif t Superintendent.

., 5.0 SUBSEQUENT ACTIONS 5.1 Proceed to implement the Emergency Plan as directed by the Shift (p

^

Supervisor / Shift Superintendent.

5.2 If severe weather or high natural water levels threaten the plant ,

' maintain contact with of fsite weather, news, or other information

agencies to ensure continuous information updates.

, 5.3 Ensure operability of plant floor and equipment drain sumps and pumps.

Make use of portable pumps as necessary to control expected or actual h igh water condit ions.

.t 5.4 Survey the site grounds and inside building areas as necessary to determine potent ial and actual equipment problems. Pay particular  ;

attention to the radial wells and their associated equipment. Refer to ONEP 05-1-02-V-11 for a Loss of Plant Service Water.

5.5 Continue to operate the plant in accordance with the appropriate !OI.

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