ML20204J027
| ML20204J027 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Haddam Neck, 05000000 |
| Issue date: | 05/12/1987 |
| From: | CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | |
| Shared Package | |
| ML20204H467 | List:
|
| References | |
| EOP-3.1-23, NUDOCS 8810240521 | |
| Download: ML20204J027 (3) | |
Text
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aouserr-i nuv. e-s' E0P 3.1-23 Rev. 9 E0P2 ggy 1 g j!gy Connecticut Yankee PL orenATioNs naview COMMIT aAPPRovAL Emergency Operating Procedure
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LOSS OF CIRCULATING WATER Apr n
upam 1.0 DISCUSSION
"'/ 2 ' N 1.1 A total loss of circulating water (CW) to either condenser will result in an automatic plant trip.
The loss of a single CW pump to a condenser will require the plant load to be reduced until the CW pump can'be restored.
2.0 SYMPTOMS 2.1 Reactor and turbine trip alatins, a
2.2 4160V motor and/or breaker al'ams indicating CW pump or motor failure.
T 2.3 Abnormai indication on CW pump ameters.
2.4 Unexplained increase in condenser back pressure.
2.5 Unbalance in back pressure and levels between condensers in the event of a loss of only one pump.
2.6 Condenser high or low level alam.
2.7 Screen house flooding alam.
1 3.0 AUTOMATIC ACTIONS 3.1 Turbine trip if total loss to either condenser.
3.2 Reactor trip if total loss to either condenser if power greater than 10%.
6 4.0 IMMEDIATE OPERATOR ACTION NOTE:
If safety injection system is actuated or required perfom this procedure in parallel with E-0.
r-4.1 If both cire pumps in either condenser (A or B) trip or if a rupture y
in the cire water system in the screen house is indicated, then perfom the imediate actions contained in E-0, Reactor Trip or Safety Injection. Steps 1 through 4, then return to this procedure if no $!
signal actuated or required.
i 8810240521 881007 Page 1 of 3 PDR ADOCK 05000213 P
E0P 3.1-23 Rev. 9 E0P2
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5.0 SUBSEQUENT OPERATOR ACTION 5.1 If flooding alaimi from the screenwell house is indicated, check operational status of the CW system.
5.2 When a cire pump or oumps are lost, reduce plant load observing the limits in section 5.6 of this procedure.
5.3 Stop any liquid radioactive and chemical releases until flow is restored or a new release pennit issued.
5.4 If only one 9 ump is affected, isolation of the hotwell makeup or high level control valves and manual control of level via the associated motor operated valves may be required.
5.5 If pump cannot be restarted, isolate the affected water box from the vacuum priming and condenser air removal systems and break water box vacuum.
5.6 Adjust load as necessary to stabilize or recover condenser vacuum, observing the following limitations:
5.6.1 Plant delta T across condensers not to exceed 38'F.
I 5.6.2 Discharge canal temperature not to exceed 121*F.
(
5.6.3 Two inches Hg maxi m delta P between North and South ends of the condenser not to exceed the steady state limits of Attachment A.
y 5.6.4 Do not run hotwell levels 100% or greater as indicated on MCB as covering condenser tubes causes them to break.
NOTE:
A.
Prior to starting a cire pump reduce plant load to bring the condenser delta P to 1 in This will help limit the tidal wave effect when starting circulating water pumps, which could cause condensate pump cavitatten.
B.
Insure combined hotwell levels with circulating water pump shutdown are at least equal to nonnal total running levels.
Do not cover any condenser tubes.
5.7 If unable to maintain the condenser vacuum, refer to Emergency Procedure E0P 3.1-8, t.0SS OF CONDENSER VACUUM.
5.8 Conduct investigation to detennine cause of CW loss, r
5.9 Return to procedure and step in effect.
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