ML20072K941

Public Version of Rev 2 to Emergency Plan Implementing Procedure SC-4.1, Low Screenhouse Water Level

ML20072K941
Person / Time
Site:	Ginna
Issue date:	02/23/1983
From:	ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17256A589	List: ML17256A587 ML17256A592 ML20072K941
References
SC-4.1-01, SC-4.1-1, NUDOCS 8303310054
Download: ML20072K941 (4)

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GINN A STATION UNIT #1 COMPLETED DAR :.

ROCHESTER GAS AND ELECTRIC' CORPORATION TIME :-

GINNA STATION 17 CONTROLLED COPY NUMBER

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PROCEDURE NO.

SC-4.1 REV. NO.

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- LOW SCREENHOUSE-WATER LdVEL

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TECHNICAL REVIEW

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QC REVIEW PLANT SU(JifRINTENDENT l

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EFFECTIVE'DATE l

QA C NON-CA CATEGORY 1.0 REVIEWED BY:

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THIS PROCEDURE CONTAINS 3

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SC-4.1:1 SC-4.1 LOW SCRrunmOUSE WATER LEVEL 1.0 PURPOSE

,. 1.1 To provide instructions for response to screenhouse water

...~.1evels -which-threa. ten' to e f fect_ the capabilities..cf plant

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cooling, equipment.

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1.2 To provide instructions for appropriate no't'ificati6n ~f.o

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~~ authorities of the above in accordance with pre-established

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REFERENCES:

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_ N'U R E G~ 0654', Appendix.1." Emergency.'dction. Le. vel Guidelines ~

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.for, Nuclear, Power.TPlant's..

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2.2 The historic low lake level is 241.4 ft. and the plant design low-level is 243.0 ft: USC and GS datum ('sub t ra e t 1.2T for

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IGL datum).

Due to present lake level control it is not

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expected to_go.below 243 ft. o_r not below an additional

.. foot._due to sou.th.hurri. cane.. force. winds.

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3.0 INSTRUCTIONS

CAUTIONS:. The head loss from the intake to the pump suction with two circulating pumps on is 9 1/2 ft.,

which results in a design low water level in the suction

-bay of 233 1/2 ft. USC-GS datum, or 19 1/2 ft.

indicated level (21 ft. above suction bay ficor).

The.compdter readout is from the fore bay, upstream _

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' of.~the scrsens, E there fore' readings a re'. betwee n. --'

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the' lake level and the suction ' bay level. _ "The ',

,,.- l suction of the. service water pumps is at 4'3"-

indicated level and the suction of the fire water pumps is at 12'3" indicated level.

3.1 Whenever low screenhouse water level conditions or traveling screen plugging conditions occur, the following control rocm indications will alert the operator.

3.1.1 Traveling screen different-ial high at 6".

3.1.2 Traveling screen differential emergency high at 10".

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SC-4.1:2 3.1.3 Screenhouse level low alarm at 17 ft.

3.1.4 Screenhouse level lo-lo alarm at 15 ft.

3.2 In the event of traveling screen differential low and lo-lo alarms, perform actions per alarm resnonses AR-I-l and AR-I-9.

.3.3.

. In the e v e n t-that auction-bay. level decreases to the 17

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ft. alarm point, perform the following:

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Verify ' operation o,f all 'sEreens.

3.3.2 If low ' level persists after checking screen operation consider

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opanik thi recirculation'* gate, evaluating the facta surrounding.'L 7 ~_~.-

"th~e-condition,".and-load;. cKanie's that may be_necessaryf" -

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3.3.3'~ ~- ff.-lt is seen tha t-the le.ve1 condition is deteriorating

.o p,e n..t h e recirculation gate ^and reduce load.~a's nec e s s a ry'.

., to, maintain, discharge temperature within limits.

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Evaluate.and.cl_assify-condition per SC-100 Ginna Station, iv_ent Eva,1ua, tion and Classification and imple' ment appifcable

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51hergency procedure.

3.3.5 If warranted, reduce load to-50% in anticipation of stopping

, _._ one. circulating yater pump _ Stopping one.-pump-should.. restor,e.,-.

about-7.. f t. -in' the. screenhouse.

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3.4 If the level decreases to the 15 ft. alarm point perform the following:

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3.4.1 Open the recirculating gate full open.

3.4.2 Reduce load to less than 50%.

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3<4.3 Monitor circulating water pump and service water pump 6ischarge pres sure s.-

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. 3. 4. 4 ' ~" Cont'inue t'o check for screen pIbgging and-take'n'eded efforts e

to clear it.

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If pump discharge pressures being monitored show any deterio-ration, immediately stop one circulating water pump.

3.5 If the level remains below the 15 ft. alarm point with only one circulating pump running, perform the following:

3.5.1 Proceed with an orderly shutdown, stopping the remaining circulating water pump.

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SC-4.1:3 3 5.2 Continue pump discharge pressure monitoring and screen clearing.

3.5.3 If the level decreases to 13 ft.,

proceed to cold shutdown immediately.

3.5.4 If condition persists call the Fire Protection and Safety Coordinator or his alternate to install fon-lay = 6# thraa inch hose (fitted with two and one half inch couplings) frcm two-dcunestic water hydrants to two wall hydrants uti'lizing

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_ clapper valves to prevent..back ficw.

This will supply greater

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than.two thousand gallons per minute to the fire system

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from the domestic water supply.

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the Ontario Volunteer Fire, Department,to Consider callincj

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. "iitand by until. these connecti6ns are made._

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..If. the leve-1. decreases further and ser.* ice-wa_ter discharge r:

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~_ iEter system while at the 15, ft. alarm point pe' form the w

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.Immsdiately call for Ontario Fire Department Assistance,

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3. 6."Z" Take every effort to augmTnt cooling capacity by making use of the yard hydrant supply.

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