ML20002A750

Emergency Operating Procedure EOP-14, Inadequate Core Cooling.

ML20002A750
Person / Time
Site:	Summer
Issue date:	11/10/1980
From:	SOUTH CAROLINA ELECTRIC & GAS CO.
To:
Shared Package
ML20002A746	List: ML20002A745 ML20002A747 ML20002A748 ML20002A749 ML20002A750
References
EOP-14, NUDOCS 8011210469
Download: ML20002A750 (6)

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SOUTE CAROLINA ELECTRIC AND GAS COMPANY VIRGIL C. SUMMER NUCLEAR STATION

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EMERGENCY OPERATING PROCEDURE E0P-14 INADEQUATE CORE COOLING REVISION O NOVEMBER 10, 1980 SAFETY RELATED Reviewed.by: .

ORIGINATOR (of this revision) Date l

QUALIFIED REVIEWER Date Approved:

OPERATIONS SUPERVISOR Date Date Issued:

Form AP-101-2 (1/60) 8011210/67

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4 . i E0P-14 PAGE i REVISION O 11/10/80 LIST OF EFFECTIVE PAGES PAGE REVISION i , 0 1 0 s')

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~~. E0P-14

, PAGE 1 RE7ISION O  :

11/10/80 1.0 PURPOSE 1.1 This procedure provides instruction to:

1.1.1 Establish cooling to the reactor during periods when other means of core cooling are not available.

1.1.2 Minimize core damage during emergencies where core temperatures are increasing.

2.0 REFERENCES

AND GLOSSARY -

2.1 References .

2.1.1 E0P-1 Safety Injection Actuation.

2.1.2 E0P-13 Natural Circulation.

2.'2 Glossary None 30 SYMPTOMS 31 Main and emergency feedwater is not operable or sufficient to maintain a heat sink and adequate core cooling. s

, 32 Steam generator-levels ,are lowor off scale. . -

3 3,, Secondary. stean ragease,is '

not sufficiegt. ,$,o provlde adequate core cooling.-

3.4 Any five' (5) incore thermocouples indicating > 650*F and .

increasing as measured on:

1) Plant computer or

2) Subcooling monitor or ~

3) In Core thermocouple indicator

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4.'O. AUTOMATIC ' ACTION 4.1 None

-50 IMMEDIATE OPERATOR ACTION i 51 None

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PAGE 2 REVISION O 11/10/80 6.0 FOL10W UP OPERATOR ACTION NOTE: Throughout this procedure continue efforts to establish feedwater flow'to the steam generators and reestablish core cooling via the secondary steam dumps.

6.1 If not safety injecting, manually safety inject.

6.2 If during the procedure the RWST lov low level is reached, establish cold leg recirculation as per E0P-1, Attachment I, steps 6.19 through 6.26.

63 Stop all operating Reactor Coolant Pump to reduce heat load.

6.4 continue maximum safety injection flow to fill the pressurizer.

6.5 When pressurizer le water solid as indicated by rapidly increasing pressurizer pressure valve (PCV-444B, 445A, or 4453), open one (1) PZR power relief NOTE: The pressurizer relief tank rupture disk will break.

6.6 Open or C".se additional PZR power relief valves ao necessary to maintain cubcooling and pressurizer preasure less than 2400 psig. .

N5tE: Pressurizer Pressure will stabilize at come pressure where charging /SI flow will equal relief valve flow. This stable pressure can be varied by opening / closing relief valves and or charging pump mini flow' valves.

d . 6 .1 If pressure must be held near,2400 psig to provide  ;

subcooling. i A. Reset Safety Injection Train A & B.  !

B. Open MVG-8109A, B, and C and MVG-8106 to establish '

charging pump minimum flow.

C. Close MVG-6109A, B, and C and MVG-8106 whenever 1 pressurizer pressure drops to 1550 psig.

• 6.7 Continue menitoring incore thermocouples on the core subcooling .

monitor or plant computer._ j 6.6.1 If thermocouple readings exceed the computer range, have a  :

millivolt meter attached to the core exit thermocouple indicator for reading higher temperatures.

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E02-14 PAGE 3 l REVISION O 11/10/80 6.8 If the above does.not result in decreasing. core exit thermocouple temperatures,. start one (1) Reactor Coolant Pump to establish forced flow through the core.

NOTE: Frecautions smd limitations for RCS status are waived for this procedure.

6.8.1 Run the Reactor Coolant Pump for 5 to 10 minutes and then stop.

6.8.2 _ Alternating the reactor coolant pump in use, start and stop another reactor coolant pump at 30 minute intervals as long as'they are available.

70 FINAL CONDITIONS 71 Reactor Cooling has been achieved via the pressurizer relief valves.

OR 72 Reactor Cooling via the secondary steam dumps has been achieved.

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