ML20034B366

Proposed Tech Specs Re Limiting Conditions for Operation & Surveillance Requirements Re Special Test Exceptions, Radioactive/Gaseous Effluents & Radiological Environ Monitoring

ML20034B366
Person / Time
Site:	Yankee Rowe
Issue date:	04/20/1990
From:	YANKEE ATOMIC ELECTRIC CO.
To:
Shared Package
ML20034B362	List: ML20034B361 ML20034B366
References
NUDOCS 9004270061
Download: ML20034B366 (14)

Text

WW 4

9 0

0 o-I ATTACHMENT 3 MODIFIED TECHNICAL SPECIFICATION PAGES i

i s

i c

L I

,h k i bt's b ' ' '.

9p P

INDEX LIMITING CONDITIONS FOR ' 0PERATION M(D SURVEILLANCE REQUIREMENTS SECTION PAGE 3/4.9.12 SPENT FUEL PIT BUIIIING IS0LATION........................

3/4 9-13 3/4.10_ _ SPECIAL TEST EXCEPTIONS 3/4.10.1 SHUTDOWN MARGIN..........................................

3/4 10-1 3/4.10.2 CONTROL ROD OPERABILITY AND INSERTION LIMITS.............

3/4 10-2

'3/4.10.3 PRESSURE / TEMPERATURE LIMITATION - REACTOR CRITICALITY.... 3/4 10-3 8

3/4.10.4 PHYSICS TESTS............................................

3/4 10-4 3/4.10.5 REDUCED LEVEL OPERATION WITHOUT COLD LEG OPENING.........

3/4 10-5 3/4.10.6 REDUCED LEVEL OPERATIOE FOR COLD LEG OPENING.............

3/4 10-7 3/4.10.7 REDUCED LEVEL OPERATION FOR COLD LEG OPENING WITH LOW DECAY HEAT...............................................

3/4 10-9 3/4.11 RADIOACTIVE EFFLUENTS 3/4.11.1 LIQUID EFFLUENTS Concentration............................................

3/4 11-1 Dose.....................................................

3/4 11-4 Liquid Radwaste Treatment................................

3/4 11-5 Liquid Holdup Tanks......................................

3/4 11-6 3/4.11.2 GASEOUS EFFLUENTS Dose rate................................................

3/4 11-7 Doset Noble Gases.......................................

3/4 11-10 Dose:

Iodine-131. Tritium, and Radionuclides in Particulate Form..................................

3/4 11-11 Gaseous Radwaste Treatment...............................

3/4 11-12 Expl o s ive Gas Mixt ure....................................

3/4 11-13 Cas Storage Tank.........................................

3/4 11-14 l

3/4.11.3 SOLID RADI0 ACTIVE WASTE..................................

3/4 11-15 YANKEE-ROWE VIII Amendment No. 80

.., m...,_..... _.

. ~ m

.n m ~ w.,., -. m

e 4

INDEX LIMITING CONDITIONS FOR OPERATION AND SURVEILLANCE R M ENTS SECTI%Y PAGE 3/4.11.4 TOTAL D0SE..............

................................ 3/4 11-16 3/4.12 RADIOLOGICAL ENVIRONMENTAL MONITORINC 3/4.12.1 MON ITOR ING PR0G ENf....................................... 3/4 12-1.

3/4.12.2 LAND USE CENSUS..........................................

3/4 12-9 3/4.12.3 INTERCOMPARISON PR0 GRAM..................................

3/4 12-10 i

e

-YANKEE-ROWE VIII-a.

Amendment No. 80

'i

-i f

4e.

..,4

INDEX BASES e

SECTION PA]j 3/4.9.3 DECAY TIME............................................

..B 3/4 9-1 3/4.9.4 CONTAINMENT BUILDING PENETRATIONS........................B 3/4 9-1 3/4.9.5 COMMUNICATIONS...........................................B 3/4 9-1

{

3/4.9.6 SHIELD TANE CAVITY MANIPULATOR CRANE OPERABILITY.........B 3/4 9-2 3/4.9.7 CRANE TRAVEL - SPENT FUEL PIT............................B 3/4 9'-2 i

3/4.9.8 RESIDUAL HEAT REMOVAL AND COOLANT CIRCULATION............B 3/4 9-2:

i 3/4.9.9 CONTAINMENT PURGE FAN SHUTDOWN SYSTEM....................B 3/4 9-2 3/4.9.10 and

~3/4.9.11 WATER LEVEL - REACTOR VESSEL AND SPENT FUEL PIT..........B 3/4 9-2.

3/4.9.12 SPENT FUEL PIT BUILDING IS0LATION........................B 3/4 9-3 i

3/4.10 SPECIAL TEST EXCEPTIONS 5

3/4.10.1 SHUTDOWN MARGIN..........................................B 3/4 10-1 r

3/4.10.2 CONTROL ROD OPERABILITY AND INSERTION LIMITS.............B 3/4 10-1 9

3/4.10.3 PRESSURE / TEMPERATURE LIMITATIONS - REACTOR CRITICALITY...B 3/4 10-1 r

3/4.10.4 PHYSICS TESTS............................................B 3/4 10-1 3/4.10.5, 3/4.10.6, and 3/4.10.7 REDUCED LEVEL OPERATION..................................B 3/4 10-2 3/4.11 RADIOACTIVE EFFLUENTS 3/4.11.1 LIQUID EFFLUENTS.........................................B 3/4 11-1 3/4.11.2 CASEOUS EFFLUENTS........................................B 3/4 11-2 3/4.11.3 SOLID RADIOACTIVE WASTE..................................B 3/4 11-5 3/4.11.4 D0SE.....................................................B 3/4 11-6 3/4.12 RADIOLOGICAL ENVIRONMENTAL MONITORING 9

L 3/4.12.1 MONITORING PR0 GRAM.......................................B 3/4 12-1 I

3/4.12.2 LAND USE CENSUS..........................................B.3/4 12-l' 3/4.12.3 INTERCOMPARISON PR0 GRAM..................................B 3/4 12 YANKEE-ROWE XII Amendment No. 46, 49, 66, 80

• bEFINITIONS f

PURGE - PURGING 1.32 PURGE or PURGING is the controlled process of discharging air or gas i

from a confinement to maintain temperature, pressure, humidity, concentration, or other operating condition, in such a manner that replacement air or gas is required to purify the confinement.

j MEMBER (S) 0F THE PUBLIC l

1.33 MEMBER (S) 0F THE PUBLIC shall include all persons who are not occupationally associated with the plant.

This category does not include employees of the utility, its contractors, or vendors. Also excluded from this category are persons who entee the site to service equipment or to make deliveries. This category does include persons who use portions of the site for recreational, occupational, or other purposes not associated with the production of electricity.

SITE BOUNDARY 1.34 The SITE BOUNDARY shall be that line beyond which the land is not owned, leased, or otherwise controlled by the licensee. Any area within the y

site boundary used for residential quarters or recreational-purposes shall be considered to be beyond the site boundary for purposes of meeting gaseous effluent dose specifications.. (Realistic occupancy factors shall be applied at these locations for the purposes of dose calculations.)

SOLIDIFICATION 1.35 SOLIDIFICATION shall be the conversion of wet wastes into a form that meets shipping and burial ground requirements.

CORE OPERATING LIMITS REPORT 1.36 CORE OPERATING LIMITS REPORT - This report is the unit-specific document that provides the core operating limits for the current operating reload cycle. These cycle-specific operating limits shall be determined for each reload cycle in accordance with Specification 6.9.4..

Plant operation within these operating limits is addressed in individual specifications.

REDUCED LEVEL OPERATION 1.37 REDUCED LEVEL OPERATION shall be the condition that exists whenever the reactor vessel water level is lower than 2 feet below the reactor vessel flange and irradiated fuel is in the reactor.

r YANKEE-ROWE l-6 Amendment No. 80, I28 e

agn m, f..g g e ege m,ey., A esg' pg peuygegg $mg%'tggpe; g44A,gsgegg gggggepgewgeggeppirygg ptg,g,gg,

1. 8 9

d 9

'e L e g

e 5 s 4 %e g

NEACTIVITY CONTROL SYSTEMS CHARGING PUMPS - REFUELING LIMITING CONDITION FOR OPERATION 3.1.2.4 At least two charging pumps in the boron injection flow path required

. by Specification 3.1.2.1 shall be OPERABLE.

1 APPLICABILITY: MODE 6*.

ACTIONt With less than two chargir 3 pumps OPERABLE, suspend all operations ' involving CORE ALTERATIONS or positive reactivity changes until at least two charging pumps are restored to OPERABLE status.

e

- i i

i SURVEILLANCE REOUIREMENTS 4.1.2.4' At least the above required charging pumps shall be demonstrated OPERABLE at least once per 31 days by:

i Starting (unless already operating) each pump from the Control Room, a.

b.

Verifying that each pump develops a discharge flow 126 gpm, c.

Verifying pump operation for at least 15 minutes.

i L

I F

h F

• See Special Test Exceptions 3.10.5'and 3.10.7 for REDUCED LEVEL OPERATION.

YANKEE-ROWE 3/4 1-13 Amendment No.

}

?

I

..u

T REACTIVITY CONTROL SYSTEMS CHARGING PUMPS - SHUTDOWN IIMITING CONDITION FOR-OPrRATIQel 3.1.2.5 At least one charging pump in the boron injection flow path required by Specification 3.1.2.2 shall be OPERABLE.

_$PPLICABILIIY: MODE 5*.

ACTION:

With no charging pump OPERABLE, suspend all operations involving positive reactivity changes until at least one charging pump is restored to OPERABLE status.

SURVEILLANCE REQUIREMENTS 4.1.2.5 'At least the above required charging pump shall be demonstrated OPERABLE at least once per 31 days by a.

Starting (unless already operating) the pump from the Control Room, b.

Verifying that the pump delivers a flow 126 gpm to the Main Coolant-System, and c.

Verifying pump operation for at least 15 minutes.

• See Special Test Exceptions 3.10.5 and 3.10.7 for REDUCED LEVEL OPERATION.

YANKEE-ROWE 3/4 1-14 Amendment No. 35 l

EMERCENCY CORE _q00 LING SYSTEMS (ECCS)

ECCS SUBSYSTEMS MMITING CONDITION FOR OPERATION 3.5.3 The ECCS subsystems shall be OPERABLE with a.*

As a minimum, one OPERABLE ECCS safety injection subsystem comprised of the following:

3 1.

One OPERABLE high pressure safety injection pump,#

One OPERABLE low pressure safety injection pump,# and 2.

i 3.

An OPERABLE flow path ## capable of taking suction from the safety injection tank.

b.*

An OPERABLE ECCS recirculation subsystem with an OPERABLE flo*w path capable of taking suction from the containme sump and recirculating to the safety injection header c*

An OPERABLE ECCS long term hot leg injection subsystem with an OPERABLE flow path capable of taking suction from the ECCS safety injectionsubsygemanddischargingtotheMainCoolantSystem loop 4 hot leg APPLICABILITY: MODE 4 and 5.

• Main coolant pressure < 1000 psig but > 300 psig.

1. A maximum of one HPSI pump and one LPSI pump shall be OPERABLE whenever MCS temperature is between 200'F and 324'F.

All HPSI pumps and LPSI pumps shall be inoperable whenever MCS temperature is 1 200'F, except thatt

a. One LPSI pump may be energized for surveillance testing requirements or for mixing the safety injection tank provided that either l

l 1.

The reactor vessel head is removed, or l

2.

The LPSI pump recirculation valve (s) are open to limit pump discharge pressure to 1 280 psig.

b. Two HPSI pumps may be energized for surveillance testing requirements provided that either:

1.

The reactor vessel head is removed, or 2.

At least one pressurizer code safety valve is removed.

c. Two HPSI pumps and one LPSI pump, lined up for series operation with discharge to the MCS hot legs, may be OPERABLE for REDUCED LEVEL OPERATION (as required by Special Test Exception 3.10.6) provided that:

1.

At least one pressurizer code safety valve is removed, or 2.

The pressurizer manway is removed.

1. 0Whenever the MCS temperature is 1 324'F, the reactor vessel head'is bolted on and both pressurizer code safety valves are installed, all four loop l

injection M0V's and all four LPSI MOV's shall be closed and the LPSI pump recirculation valve shall be open, except that loop SI system header isolation valves to the MCS cold legs may be open provided that the associated MCS loop isolation valves are closed or when required to be open I

to perform Surveillance Requirements 4.5.2.a.1, 4.5.2.e.3(a), and'4.5.2.f.

YANKEE-ROWE.

3/4 5-9 Amendment No. #f, 52. If m..<...._...s....,.....

-,..,,._,,,y.,2,,,.,,,,.,,,,,_.,,..,,.,

g

EMERGENCY CORE COOLING SYSTEMS SAFETY INJECTION TANK j

LIMITING CONDITION FOR OPERATION 3.5.4 The Safety Injection Tank (SIT) shall be OPERABLE with:

a.

A minimum contained borated water volume of 117,000 gallons, equivalent to a level of 125.5 feet.

b.

A minimum boron concentration of 2,200 ppm, and c.

A water temperature of 120'T to 130'F.##

APPLICABILITY: MODES 1, 2, 3, 4*, 5*#, and 6#.

i ACTION:

With the safety injection tank inoperable, restore the tank to OPERABLE, status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least HOT STMVDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTLOWN with main coolant pressure <300 psig within the following 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

SURVEILLANCE REOUIREMENTS 4.5.4 The SIT shall be demonstrated OPERABLE:

a.

At least once per 7 days by:

1.

Verifying the contained' borated water volume in the tank, and 2.

Verifying the boron concentration of the water.

b.

At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the SIT temperature.##

1

• Main coolant pressure 1300 psig.

1. Whenever Special Test Exceptions 3.10.5, 3.10.6, or 3.10.7 for REDUCED LEVEL' OPERATION are applicable.

1. 1. Not required for REDUCED LEVEL OPERATION.

4 YANKEE-ROWE 3/4 5-12 Amendmen t No. # f, 5 9, 92

SPECIAL TEST EXCEPTIONS REDUCED LEVEL OPERAT103 WITHOUT COLD LEC OPEN1RG LIMITING CONDITION FOR OPERATION 3.10.5 The limitations of Specificatious 3.1.2.4 and 3.1.2.5 shall be replaced by the following during REDUCED LEVEL OPERATION without a cold leg opening t a.

The Main Coolar.t System shall be vented by removing one of the pressurizer code safety valves or removing the pressurizer manway, b.

As a minimum, two charging pumps with an OPERABLE flow path capable of taking suction from the safety injection tank and discharging only to the cold legs, shall be OPERABLE, e

c.

The core exit temperature shall be less than or equal to 100'F, d.

A maximum of one hot leg loop isolation valve, or its equivalent (total area of all hot leg openings less than or equal to 2

0.84 ft ), may be removed, e.

No cold leg openings may exist simultaneously with any hot leg openings, and f.

Shutdown time shall be greater than or equal to 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.

APPLICABILITY:

MODES 5 and 6.

ACTION:

a.

With less than two charging pumps OPERABLE, restore the OPERABLE pumps within two hours, or b.

Close all hot leg openings and increase the water level higher than two feet below the vessel flange.

SURVEILLANCE REOUIREMENTS 4.10.5.1 The two charging pumps shall be demonstrated OPERABLE within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to entering REDUCED LEVEL OPERATION by Starting (unless already operating) each pump from the Control Room, a.

b.

Verifying that each pump delivers a flow 126 gpm to the Main Coolant System, and c.

Verifying pump operation for at least 15 minutes.

YANKEE-ROWE 3/4 10-5 Amendment No.

j l

1 I

i

~

SPECIAL TEST EXCEPTIONS REDUCED LEVEL OPERATION WITHOUT COLD LEC OPENING f

SURVEILLANCE KEOUIREMENTS (Continued) 4.10.5.2 Verify that at least two of the following valve sets are in the indicated positions at least once per 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />st Ypive Set Valve Number Valve PgsitinD Let 1 (Loop 1)

SI-MOV-25 Open CS-MOV-536 Open MC-MOV-326 Open-MC-MOV-501 Closed 8

Set 2 (Loop 2)

SI-MOV-24 Open CS-MOV-537 open MC-MOV-302 Open MC-MOV-502 Closed Set 3 (Loop 3)

SI-MOV-23 Open CS-MOV-538 Open MC-MOV-310 Open MC-MOV-503 Closed i

Set 4 (Loop 4)

SI-MOV-22 Open CS-MOV-539 Open MC-MOV-318 Open-MC-MOV-504 Closed 4.10.5.3 Verify that the following valves are in the indicated positions at least once per 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />s:

i Valve Number Valve FunctioD Valve Position a.

CII-MOV-523 Charging Line Isolation Closed b.

CH-MOV-522 Charging to SI and Loop Fill Open-l YANKEE-ROWE 3/4 10-6 Amendment No.

I

....s,....,...-._..,...._._,..~...

SPECIAL TEST EXCEPTIONS o

', ' REDUCED LEVEL OPERATION FOR COLD LEC OPENING LIMITING CONDITION FOR CPERATION 3.10.6 The limitations of Specification 3.5.3 shall be replaced by the following during REDUCED LEVEL OPERATION with a cold log opening when the core decay heat is >500 kW:

a.

The Main Coolant System shall be vented by removing one of the pressurizer code safety valves or removing the pressurizer manway, b.

The ECCS subsystems shall be OPERABLE with two OPERABLE HPSI pumps and one OPERABLE LPSI pump with an OPERABLE flow path capable of taking suction from safety injection tank and discharging only to the Main Coolant System Loop 4 hot leg, (MCS shall be vented beforb the ECCS subsystems are made operable),

c.

The core exit temperature shall be less than or equal to 100*E, d.

A maximum of one cold leg loop isolation valve, or its equivalent (total area of all cold leg openings less than or equal to 2

0.84 ft ), may be removed, e.

No hot leg openings may exist simultaneously with any cold leg openings, and f.

Shutdown time shall be greater than or equal to 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.

APPLICABILITY: MODES 5 and 6 ACTION:

a.

With one of the required SI pumps inoperable, restore the inoperable pump to OPERABLE status within two hours, or b.

Close all cold leg openings and increase the water level higher than two feet below the vessel flange.

i SURVEILLANCE REOUIREMENTS 4.10.6.1 The above required ECCS subsystem shall be demonstrated OPERABLE within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to creating cold leg opening by:

1.

Verifying that each OPERABLE HPSI pumps a) Starts from the control room.

b) Develops a discharge pressure of 1850 psig on recirculation flow to the safety injection tank.

c) Operates for at least 15 minutes.

YANKEE-ROWE 3/4 10-7 Amendment No.

$lgCTAL TEST EXCEPTIONS

, EDUCED LEVEL CPERATION FOR COLD LEG OPENING R

SUFVEILLANOT RFOUIREMENTS (Continued) 2.

Verifying that the OPERABLE LPSI pumpt a) Starts from the control room.

b) Develops a discharge pressure sf 2250 psig on recirculation flow through CS-MOV-532.

c) Operates for at least 15 minutes.

4.10.6.2 The following valves shall be verified to be in the indicated positions at least once per 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />st Valve Valve Number Valve Function Position

a. CS-MOV-532 LPSI Recirculation Line Closed

b. CS-MOV-533 LPSI Pump Header Isolation Closed

c. CS-MOV-534 LPSI Pump Heade,r Isolation Closed

d. CS-MOV-535 LPSI Pump Header Isolation Closed

e. SI-MOV-518 HPSI and LPSI Pump Header Suction Isolation Open

f. SI-MOV-48 HPSI and LPSI Minimum Recirculation Line Open

g. SI-MOV-49 HPSI and LPSI Minimum Recirculation Line Open

h. SI-MOV-515 Hot Leg Injection Isolation Open

i. SI-MOV-514 Hot Leg Injection Isolation Open

j. SI-MOV-516 VC Sump Isolation Closed

k. SI-MOV-517 VC Sump Isolation Closed

1. SI-MOV-46 HPSI Isolation Closed

m. SI-MOV-520 HPSI Flow Control Closed

n. SI-MOV-4 LPSI Pump Crossover to HPSI Pump Open

o. CS-MOV-536 SI Header Isolation to Cold Leg Closed

p. CS-MOV-537 SI Header Isolation to Cold Leg closed

q. CS-MOV-538 SI Header Isolation to Cold Les closed

r. CS-MOV-539 SI Header Isolation to Cold Leg Closed

s. MC-MOV-319 MCS Loop Isolation Closed

t. CH-MOV-524 Charging Hot Leg Injection Open

u. CH-MOV-550 Charging Line Isolation Open

v. PR-MOV-548 Auxiliary Pressurizer Spray closed

v. PR-MOV-549 Auxiliary Pressurizer Spray Closed l

l l

l l

YANKEE-ROWE 3/4 10-8 Amendment No.

{

i t.

EFECIAL TEMT EXCEF'11 lmb REDUCED LEVEL OPFRATION FOR COLD LEG OPENING WITH LOW DECAY HFAT

,, LiMITIN'] 00i4DITION FOR QIf2ATION 3.10.7 The limitations of Sperit'ications 3.1.2.4 and 3.1.2.5 shall be replaced by the following during REDUCED LEVEL OPERAT10N with a cold leg opening when the core decay heat 1500 kW:

The Main Coolant System shall be vented by removing one of the s.

pressurizer code safety valves or removing the prescurizer manway, b.

At least two charging pumps with an OPERABLE flow path capable of taking suction from safety injection tank and discharging to the Loop 4 hot leg shall be OPERABLE, j

The core exit temperature shall be less than or equal to 100'F, c.

d.

A maximum of one cold leg loop isolation valve, or its equivalent' (total area of all cold leg openings less than or equal to 2

0.84 ft ), may be removed, and No hot leg openings may exist simultaneously with any cold leg e.

openings.

APPLICABILITY: MODES 5 and 6.

ACTION:

Wf th less than two charging pumps OPERABLE, restore two OPERABLE a.

pumps within two hours, or i

b.

Close all cold leg openings and increase the water level higher than two f eet below the vessel flange.

SURVEILLANCE REOUIREMENTS 4.10.7.1 The two charging pumps shall be demonstrated OPERABLE within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to entering REDCUED LEVEL OPERATION by:

a.

Startin;; (unless already operating) each pump from the control room, b.

Verifying that each pump delivers a flow 126 gpm to the Main Coolant System, and c.

Verifying pump operation for at least 15 minutes.

4.10.7.2 The following valves shall be verified to be in the indicated positions at least once per 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />s:

Valve Number yalve Function yalve Position a.

Cil-MOV-522 Charging to SI and Loop Fill Closed i

b.

CH-MOV-523 Charging Line Isolation Open c.

CH-MOV-524 Charging Line Isolation Open d.

CH-MOV-550 Charging Line Isolation Open e.

PR-MOV-548 Auxiliary Pressurizer Spray Closed f.

PR-MOV-549 Auxiliary Pressurizer Spray Closed g.

MC-MOV-319 MCS Loop Isolation Closed YANKEE-ROWE 3/4 10-9 Amendment No.

3/4.10 SPECIAL TEST EXCEPTIONS O

[# 7ASES 3/4.10.5. 3/4.10.6. and 3/4.10.7 REDUCED LEVEL OPERATIQH This special test exception for REDUCED LEVEL OPERATION requires OPERABLE charging pumps and SI pumps, which is different from the normal requirements.

If Shutdown Cooling (SDC) is lost while at a reduced MCS level with a large hot leg opening, core uncovery may be caused by a combination of boiloff and water swept out the hot leg opening by the steam-water mixture.

To prevent core uncovery charging pumps injecting to the cold leg is needed.

For a large cold leg opening, water could be forced out the cold leg opening by reactor vessel pressurization if core boiling begins.

The uncovery time in this case is much shorter than the hot leg opening case.

To prevent core uncovery, SI flow injecting to hot leg is needed for the cold leg opening case.

If the decay heat is sufficiently reduced, the SI flow may be substituted by charging pumps.

In either the hot or cold leg opening case, water is injected to the opposite leg from the opening to ensure that the injected water does not, bypass the core and flow out the loop opening.

To prevent LTOP, an adequate vent path, such as removing the pressurizer code safety valve, should be available during reduced level operation, k

I YANKEE-ROWE B 3/4 10-2 Amendment No.

A