ML031970286

Tech Spec Pages for Amendments 158 and 159 Revision to Technical Specifications Regarding Suspension of Positive Reactivity Additions

ML031970286
Person / Time
Site:	Diablo Canyon
Issue date:	07/10/2003
From:	NRC/NRR/DLPM/LPD4
To:
Shukla G
Shared Package
ML031900127	List: ML031900100 ML031970286
References
TAC MB4996, TAC MB4997
Download: ML031970286 (17)

Text

RTS Instrumentation 3.3.1 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME E.

One channel inoperable.

NOTE The inoperable channel, or one additional channel for functions 6, 7, and 8.b may be bypassed for up to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for surveillance testing of other channels. For functions 2.b, 3.a, 3.b, and 14.s only the inoperable channel may be bypassed for surveillance testing of other channels.

E.1 Place channel in trip.

6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> OR E.2 Be in MODE 3.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> F. One Intermediate Range F.1 Reduce THERMAL 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Neutron Flux channel POWER to c P-6.

inoperable.

OR F.2 Increase THERMAL 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> POWER to > P-10.

G. Two Intermediate Range G.1

---

NOTE-------

Immediately Neutron Flux channels Limited boron inoperable.

concentration changes associated with RCS inventory control or limited plant temperature changes are allowed.

Suspend operations involving positive reactivity additions.

AND G.2 Reduce THERMAL 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> POWER to < P-6.

H. Not used (continued)

I-DIABLO CANYON - UNITS 1 & 2 TAB3.3-RX 3

3.3-3 Unit 1 -Amendment No. 435442,158 Unit 2 - Amendment No.435442,1 59

RTS Instrumentation 3.3.1 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME

1. One Source Range Neutron 1.1 NOTES-Immediately Flux channel inoperable.

Limited boron concentration changes associated with RCS inventory control or limited plant temperature changes are allowed.

Suspend operations involving positive reactivity additions.

J. Two Source Range Neutron J.1 Open reactor trip Immediately Flux channels inoperable.

breakers (RTBs).

(continued)

-- a DIABLO CANYON - UNITS I & 2 TAB3.3-RX 4

3.3-3a Unit 1 - Amendment No. 45 442,158 Unit 2-Amendment No..4. 442,159

RTS Instrumentation 3.3.1 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME K.

One Source Range Neutron K1 Restore channel to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> Flux channel inoperable.

OPERABLE status.

OR K2.1 Initiate action to fully 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> insert all rods.

.AND K.2.2 Place the Control Rod 49 hours5.671296e-4 days <br />0.0136 hours <br />8.101852e-5 weeks <br />1.86445e-5 months <br /> System in a condition incapable of rod withdrawal.

L.

Required Source Range L.1 NOTE Immediately Neutron Flux channel Plant temperature inoperable.

changes are allowed provided the temperature change is accounted for in the 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> calculated SDM.

AND Suspend operations Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> involving positive thereafter reactivity additions.

AND L.2 Perform SR 3.1.1.1.

M. One channel inoperable.

,NOTE--,,

The inoperable channel or one additional channel for function 8.a may be bypassed for up to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for surveillance testing of other channels. For functions 9, 10, 12, and 13, only the inoperable channel may be bypassed for surveillance testing of other channels.

MA Place channel in trip.

6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> OR M.2 Reduce THERMAL 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> POWER to < P-7.

N. Not used DIABLO CANYON - UNITS 1 & 2 TAB 3.3 - RX 5

3.3-4 (continued)

Unit 1 - Amendment No..45,158 Unit 2 - Amendment No. 4.5,159

RCS Loops - MODE 3 3.4.5 3.4 REACTOR COOLANT SYSTEM (RCS) 3.4.5 RCS Loops-MODE 3 LCO 3A.5 Two RCS loops shall be OPERABLE, and either:

a.

Two RCS loops shall be in operation when the Rod Control System is capable of rod withdrawal; or

b.

One RCS loop shall be in operation when the Rod Control System is not capable of rod withdrawal.

~NOTE All reactor coolant pumps may be removed from operation for S 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> per 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period provided:

a.

No operations are permitted that would cause introduction of coolant into the RCS with boron concentration less than required to meet the SDM of LCO 3.1.1; and

b.

Core outlet temperature is maintained at least 10"F below saturation temperature.

APPLICABILITY:

MODE 3.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One required RCS loop A.1 Restore required RCS 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> inoperable.

loop to OPERABLE status.

B. Required Action and B.1 Be in MODE 4.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> associated Completion Time of Condition A not met.

C. One required RCS loop not C.1 Restore required RCS 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> in operation, with Rod loop to operation.

Control System capable of OR rod withdrawal.

C.2 Place the Rod Control 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> System in a condition incapable of rod withdrawal.

(continued)

DIABLO CANYON - UNITS I & 2 TAB 3.4 - RX 8

3.4-8 Unit 1 - Amendment No. 435,158 Unit 2 - Amendment No. 435,159

RCS Loops - MODE 3 3.4.5 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME D. Four RCS loops inoperable.

D.1 Place the Rod Control Immediately System in a condition OR incapable of rod withdrawal.

No RCS loop in operation.

AND D.2 Suspend operations that Immediately would cause introduction of coolant into the RCS with boron concentration less than required to meet SDM of LCO 3.1.1.

AND D.3 Initiate action to restore Immediately one RCS loop to OPERABLE status and operation.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3A.5.1 Verify required RCS loops are in operation.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> SR 3.4.5.2 Verify steam generator secondary side water levels 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> are k 15% for required RCS loops.

SR 3.4.5.3 Verify correct breaker alignment and indicated power 7 days are available to the required pump that is not in operation.

DIABLO CANYON - UNITS I & 2 TAB3.4-RX 9

3.4-9 Unit 1 - Amendment No. 45,158 Unit 2 - Amendment No. 445, 159

RCS Loops - MODE 4 3.4.6 3.4 REACTOR COOLANT SYSTEM (RCS) 3.4.6 RCS Loops-MODE 4 LCO 3.4.6 Two loops consisting of any combination of RCS loops and residual heat removal (RHR) loops shall be OPERABLE, and one loop shall be in operation.

tN I to; -

1.

All reactor coolant pumps (RCPs) and RHR pumps may be removed from operation for < 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> per 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period provided:

a.

No operations are permitted that would cause introduction of coolant into the RCS with boron concentration less than required to meet the SDM of LCO 3.1.1; and

b.

Core outlet temperature is maintained at least 10°F below saturation temperature.

2.

No RCP shall be started with any RCS cold leg temperature < Low Temperature Overpressure Protection (LTOP) arming temperature specified in the PTLR unless the pressurizer water level is less than 50%, OR the secondary side water temperature of each steam generator (SG) is c 60"F above each of the RCS cold leg temperatures.

APPLICABILITY:

MODE 4.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One required loop A. 1 Initiate action to restore Immediately inoperable.

a second loop to OPERABLE status.

AND A.2

--- NOTE Only required if one RHR loop is OPERABLE.

Be in MODE 5.

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> (continued)

DIABLO CANYON - UNITS 1 & 2 TAB 3.4 - RX 10 3.4-10 Unit 1 - Amendment No. 435,158 Unit 2 - Amendment No. 435,159

RCS Loops - MODE 4 3.4.6 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME B. Two required loops B.1 Suspend operations that Immediately inoperable.

would cause introduction OR of coolant into the RCS with boron concentration less than required to meet SDM of LCO 3.1.1.

AND No RCS or RHR loop in B.2 Initiate action to restore Immediately operation.

one loop to OPERABLE status and operation.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.4.6.1 Verify one RHR or RCS loop is in operation.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> SR 3.4.6.2 Verify SG secondary side water levels are > 15% for 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> required RCS loops.

SR 3.4.6.3 Verify correct breaker alignment and indicated power 7 days are available to the required pump that is not in operation.

DIABLO CANYON - UNITS 1 & 2 TAB3.4-RX 11 3.4-11 Unit I - Amendment No. 43 44.2-158 Unit 2 - Amendment No. 435 44.2,159

RCS Loops - MODE 5, Loops Filled 3.4.7 3.4 REACTOR COOLANT SYSTEM (RCS) 3.4.7 RCS Loops-MODE 5, Loops Filled LCO 3.4.7 One residual heat removal (RHR) loop shall be OPERABLE and in operation, and either.

a.

One additional RHR loop shall be OPERABLE; or

b.

The secondary side water level of at least two steam generators (SGs) shall be 15 %.

- -- -- K r % r 1 C :_ _ _ _

-11

1.

The RHR pump of the loop in operation may be removed from operation for s 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> per 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period provided:

a.

No operations are permitted that would cause introduction of coolant into the RCS with boron concentration less than required to meet the SDM of LCO 3.1.1; and

b.

Core outlet temperature is maintained at least 10"F below saturation temperature.

2.

One required RHR loop may be inoperable for up to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for surveillance testing provided that the other RHR loop is OPERABLE and in operation.

3.

No reactor coolant pump shall be started with any RCS cold leg temperature s Low Temperature Overpressure Protection (LTOP) arming temperature specified in the PTLR unless the pressurizer water level is less than 50%, OR the secondary side water temperature of each SG is c 50°F above each of the RCS cold leg temperatures.

4.

All RHR loops may be removed from operation during planned heatup to MODE 4 when at least one RCS loop is in operation.

APPLICABILITY:

MODE 5 with RCS loops filled DIABLO CANYON - UNITS I & 2 TAB3.4-RX 12 3.412 Unit 1 - Amendment No. 434, 158 Unit 2 - Amendment No. 43&. 159

RCS Loops - MODE 5, Loops Filled 3.4.7 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

One RHR loop inoperable.

A.1 Initiate action to restore Immediately AND a second RHR loop to OPERABLE status.

OR Required SGs secondary A.2 Initiate action to restore Immediately side water levels not within required SG secondary limits.

side water levels to within limits.

B. Required RHR loops B.1 Suspend operations that Immediately inoperable.

would cause introduction OR of coolant into the RCS with boron concentration less than required to meet SDM of LCO 3.1.1.

AND No RHR loop in operation.

B.2 Initiate action to restore Immediately one RHR loop to OPERABLE status and operation.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.4.7.1 Verify one RHR loop is in operation.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> SR 3A.7.2 Verify SG secondary side water level is 2 15% in 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> required SGs.

SR 3.4.7.3 Verify correct breaker alignment and indicated power 7 days are available to the required RHR pump that is not in operation.

DIABLO CANYON - UNITS 1 & 2 TAB 3.4 - RX 13 3.4-13 Unit 1 - Amendment No. 44& 158 Unit 2 - Amendment No. 44& 159

RCS Loops - MODE 5, Loops Not Filled 3.4.8 3.4 REACTOR COOLANT SYSTEM (RCS) 3.4.8 RCS Loops-MODE 5, Loops Not Filled LCO 3.4.8 Two residual heat removal (RHR) loops shall be OPERABLE and one RHR loop shall be in operation.

NOTE_

1. All RHR pumps may be removed from operation for < 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> provided:

a. The core outlet temperature is maintained at least I OF below saturation temperature.

b.

No operations are permitted that would cause introduction of coolant into the RCS with boron concentration less than required to meet the SDM of LCO 3.1.1; and

c.

No draining operations to further reduce the RCS water volume are permitted.

2.

One RHR loop may be inoperable for s 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for surveillance testing provided that the other RHR loop is OPERABLE and in operation.

APPLICABILITY:

MODE 5 with RCS loops not filled.

, c While this LCO is not met, entry into MODE 5, Loops Not Filled, from MODE 5, Loops Filled, is not permitted.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One RHR loop inoperable.

A.1 Initiate action to restore Immediately RHR loop to OPERABLE status.

B.

Required RHR loops B.1 Suspend operations that Immediately inoperable.

would cause introduction of coolant into the RCS with boron concentration less than required to meet SDM of LCO 3.1.1.

AND No RHR loop in operation.

B.2 Initiate action to restore Immediately one RHR loop to OPERABLE status and operation.

DIABLO CANYON - UNITS 1 & 2 TAB3.4-RX 14 3.4-14 Unit 1 - Amendment No. 4a5, 158 Unit 2 - Amendment No. 45,159

AC Sources - Shutdown 3.8.2 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

(continued)

A.2.3 Suspend operations Immediately involving positive reactivity additions that could result In loss of required SDM or boron concentration.

AND A.2.4 Initiate action to restore Immediately required offsite power circuit to OPERABLE status.

B. The required DG B.1 Suspend CORE Immediately inoperable.

ALTERATIONS.

OR AND The required supply train of B.2 Suspend movement of Immediately the DFO transfer system irradiated fuel inoperable.

assemblies.

AND B.3 Suspend operations Immediately involving positive reactivity additions that could result in loss of required SDM or boron concentration.

AND B.4 Initiate action to restore Immediately required DG to OPERABLE status.

I DIABLO CANYON - UNITS 1 & 2 TAB 3.8-RX 12 3.8-12 Unit 1 -Amendment No.435,158 Unit 2 - Amendment No. 4 35 159

DC Sources - Shutdown 3.8.5 3.8 ELECTRICAL POWER SYSTEMS I

3.8.5 DC Sources-Shutdown LCO 3.8.5 APPLICABILITY:

The Class 1E DC electrical power subsystem shall be OPERABLE to support the DC electrical power distribution subsystem(s) required by LCO 3.8.10, "Distribution Systems-Shutdown."

MODES 5 and 6,.

During movement of irradiated fuel assemblies.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One or more required DC A.1 Declare affected Immediately electrical power required feature(s) subsystems inoperable.

inoperable.

OR A.2.1 Suspend CORE Immediately ALTERATIONS.

AND A.2.2 Suspend movement of Immediately irradiated fuel assemblies.

AND A.2.3 Suspend operations Immediately involving positive reactivity additions that could result in loss of required SDM or boron concentration.

AND A.2.4 Initiate action to restore Immediately required DC electrical power subsystems to OPERABLE status.

DIABLO CANYON - UNITS 1 & 2 TAB3.8-RX 21 3.8-21 Unit 1 - Amendment No.435.158 Unit 2 - Amendment No. 435. 159

Inverters - Shutdown 3.8.8 3.8 ELECTRICAL POWER SYSTEMS I

.a 3.8.8 Inverters-Shutdown LCO 3.8.8 APPLICABILITY:

The Class IE UPS Inverters shall be OPERABLE to support the onsite Class IE 120 VAC vital bus electrical power distribution subsystem(s) required by LCO 3.8.10, "Distribution Systems-Shutdown."

MODES 5 and 6, During movement of irradiated fuel assemblies.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

One or more required A.1 Declare affected Immediately inverters inoperable.

required feature(s) inoperable.

OR A.2.1 Suspend CORE Immediately ALTERATIONS.

AND A.2.2 Suspend movement of Immediately irradiated fuel assemblies.

AND A.2.3 Suspend operations Immediately involving positive reactivity additions that could result in loss of required SDM or boron concentration.

AND A.2.4 Initiate action to restore Immediately required inverters to OPERABLE status.

DIABLO CANYON - UNITS I & 2 TAB3.8-RX 27 3.8-27 Unit 1 - Amendment No. 435,158 Unit 2 - Amendment No. 435,159

Distribution Systems-Shutdown 3.8.10 3.8 ELECTRICAL POWER SYSTEMS 3.8.10 Distribution Systems-Shutdown LCO 3.8.10 APPLICABILITY:

The necessary portion of the Class I E AC, DC, and 120 VAC vital bus electrical power distribution subsystems shall be OPERABLE to support equipment required to be OPERABLE.

MODES 5 and 6, During movement of Irradiated fuel assemblies.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

One or more required AC, A.1 Declare associated Immediately DC, or 120 VAC vital bus supported required electrical power distribution feature(s) inoperable.

subsystems inoperable.

OR A.2.1 Suspend CORE Immediately ALTERATIONS.

AND A.2.2 Suspend movement of Immediately irradiated fuel assemblies.

AND A.2.3 Suspend operations Immediately involving positive reactivity additions that could result In loss of required SDM or boron concentration.

AND (continued)

DIABLO CANYON - UNITS 1 & 2 TAB3.8-RX 31 3.8-31 Unit 1 -Amendment No.435, 158 Unit 2 - Amendment No. 43,159

Nuclear Instrumentation 3.9.3 3.9 REFUELING OPERATIONS 3.9.3 Nuclear Instrumentation LCO 3.9.3 Two source range neutron flux monitors shall be OPERABLE.

APPLICABILITY:

MODE 6 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One required source range A.1 Suspend CORE Immediately neutron flux monitor ALTERATIONS except inoperable.

for latching control rod drive shafts and friction testing of individual control rods.

AND A.2 Suspend operations that Immediately would cause introduction of coolant into the RCS with boron concentration less than required to meet the boron concentration of LCO 3.9.1.

B. Two required source range B.1 Initiate action to restore Immediately neutron flux monitors one source range inoperable.

neutron flux monitor to OPERABLE status.

AND B.2 Perform SR 3.9.1.1.

Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.9.3.1 Perform CHANNEL CHECK 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> SR 3.9.3.2 NNO Neutron detectors are excluded from CHANNEL CALIBRATION.

Perform CHANNEL CALIBRATION.

24 months 3.9-2 DIABLO CANYON - UNITS 1 & 2 TAB3.9-RX 2

Unit 1 - Amendment No. 435,158 Unit 2 - Amendment No. 435,159

RHR and Coolant Circulation - High Water Level 3.9.5 3.9 REFUELING OPERATIONS 3.9.5 Residual Heat Removal (RHR) and Coolant Circulation - High Water Level LCO 3.9.5 One RHR loop shall be OPERABLE and in operation.

NOTE O

The required RHR loop may be removed from operation for 5 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> per 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period, provided no operations are permitted that would cause introduction of coolant into the Reactor Coolant System (RCS) with boron concentration less than that required to meet the minimum required boron concentration of LCO 3.9.1.

The required RHR loop maybe removed from operation for S 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> per 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period for performance of leak testing the RHR suction isolation valves provided no operations are permitted that would cause reduction of the RCS boron concentration.

I APPLICABILITY:

MODE 6 with the water level 2 23 ft above the top of reactor vessel flange.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

RHR loop requirements not A.1 Suspend operations that Immediately met.

would cause introduction of coolant into the RCS with boron concentration less than required to meet the boron concentration of LCO 3.9.1.

A.2 Suspend loading Immediately irradiated fuel assemblies in the core.

AND A.3 Initiate action to satisfy Immediately RHR loop requirements.

AND A.4 Close all containment 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> penetrations providing direct access from containment atmosphere to outside atmosphere.

DIABLO CANYON - UNITS 1 & 2 TAB3.9-RX 4

3.9-4 Unit 1 - Amendment No. 435,158 Unit 2 - Amendment No. 435,159

RHR and Coolant Circulation - Low Water Level 3.9.6 3.9 REFUELING OPERATIONS 3.9.6 Residual Heat Removal (RHR) and Coolant Circulation - Low Water Level LCO 3.9.6 Two RHR loops shall be OPERABLE, and one RHR loop shall be in operation.

APPLICABILITY:

MODE 6 with the water level < 23 ft above the top of reactor vessel flange.

NU I t While this LCO is not met, entry into a MODE or other specified condition in the APPLICABILITY is not permitted.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

Less than the required A.1 Initiate action to restore Immediately number of RHR loops required RHR loops to OPERABLE.

OPERABLE status.

OR A.2 Initiate action to Immediately establish 2 23 ft of water above the top of reactor vessel flange.

B. No RHR loop in operation.

B.1 Suspend operations that Immediately would cause introduction of coolant into the RCS with boron concentration less than required to meet the boron concentration of LCO 3.9.1.

AND B.2 Initiate action to restore Immediately one RHR loop to operation.

AND B.3 Close all containment 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> penetrations providing direct access from containment atmosphere to outside atmosphere.

DIABLO CANYON - UNITS I & 2 TAB 3.9 - RX 6

3.9-Unit 1 - Amendment No. 135,158 Unit 2 - Amendment No. 135,159