ML20202A915

Proposed Tech Specs Changing Surveillance Requirements for HPCS Pumps.Functional Test Will Verify That Each Pump Operates at Flow Rate Greater than or Equal to 50 Gpm Design Flow Rate

ML20202A915
Person / Time
Site:	La Crosse File:Dairyland Power Cooperative icon.png
Issue date:	04/01/1986
From:	DAIRYLAND POWER COOPERATIVE
To:
Shared Package
ML20202A910	List: ML20202A906 ML20202A915
References
NUDOCS 8604110089
Download: ML20202A915 (9)

Text

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EMERGENCY CORE COOLING SYSTEMS 4/5.2.24 HIGH PRESSURE CORE SPRAY SYSTEM l LIMITING CONDITION FOR OPERATION 4.2.24.1 The high pressure core spray (HPCS) system shall be operable with: l

a. For the high pressure core spray mode:

1. Two OPERABLE high pressure core spray pumps, and

2. An OPERABLE flow path capable of taking suction from the overhead storage tank and transferring the water through the core spray header to the reactor pressure vessel.

b. For the low pressure core spray mode:

1. An OPERABLE flow path capable of transferring water from the overhead storage tank to the reactor pressure vessel by gravity.

APPLICABILITY:

a. OPERATIONAL CONDITIONS 1, 2 and 3 for the high pressure core spray mode; except with the boron injection system operating.

b. OPERATIONAL CONDITIONS 1, 2, 3, and 4 for the low pressure core spray mode. '

B604110089 860401 PDR ADOCK 05000409 P PDR LACBWR 37t l

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EMERGENCY CORE COOLING SYSTEM LIMITING CONDITION FOR OPERATION (Continued)

ACTION:

a. For the high pressure core spray mode:

1. With one of the above required high pressure core spray pumps inoperable, POWER OPERATION may continue provided the manual depressurization system and the alternate core spray system are OPERABLE; restore two pumps to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

b. For the low pressure core spray mode:

1. In OPERATIONAL CONDITION 1, 2, or 3, with the low pressure core spray mode inoperable, POWER OPERATION may continue provided that the alternate core spray system is OPERABLE; restore the low pressure core spray mode to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

2. In OPERATIONAL CONDITION 4,_with the low pressure core spray mode inoperable, suspend all operations that have a potential for draining the reactor vessel.

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EMERGENCY CORE COOLING SYSTEM l e  :

, SURVEILLANCE _ _RERU,I,R,EMENTS 5.2.24.1 The high pressure core spray system shall be demonstrated OPERABLE: l 1

a. 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 valve actuation nitrogen supply pressure from the regulator to be 30 j; 10 psig.

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b. At least once per 31 days by verifying the valve actuation nitrogen supply bottle pressure to be greater than or equal to j 100 psig.

I t c. For the high pressure core spray mode:  ;

1. Each COLD SHUTDOWN, if.not performed within the previous 3 months, by cycling each power operated or automatic valve

in the flow path through at least one complete cycle of j full travel.

i i d. At least once per 18 months, during shutdown by performing a j system functional test which includes simulated automatic actuation of the system throughout its emergency operating

! sequence, and:

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1. Verifying that each automatic valve in the flow. path actuates to its correct position on a:

i (a) Release of a boron injection actuation signal for the 4 high pressure core spray mode, and i

(b) Low pressure core spray mode actuation signal.

2. Verifying that both HPCS pumps start automatically upon j receipt of a high pressure core spray mode actuation

signal.

3. Verifying that the valve actuation nitrogen supply pressure

regulators operate to control' valve actuation pressure at j 30 j; 10 psig when cycling the associated valves.

! 4. Verifying that each pump runs when started manually if and j only if a full scram signal exists.

! 5. Verifying during a test that each pump operates at a flow rate > 50 gpm.

e. Prior to startup during each refueling shutdown by verifying I that each valve, manual or automatic, in the flow path that is l not locked, sealed, or'otherwise secured in position, is in

.its correct position.

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i LACBWR .37v l WPl.6.9 L-

l EMERGENCY CORE COOLING SYSTEM MANUAL DEPRESSURIZATION SYSTEM LIMITING CONDITION FOR OPERATION 4.2.24.2 The manual depressurization system (MDS) shall be OPERABLE with: l

a. Two OPERABLE shutdown condenser steam inlet valves, and

b. Two OPERABLE shutdown condenser condensate line reactor vent valves.

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

ACTION:

With one of the above required steam inlet valves and/or reactor vent valves inoperable, POWER OPERATION may continue provided the high pressure core spray system is OPERABLE; restore the inoperable valve (s) to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

SURVEIL,L,A,N,C,E,,RXQUIREMENTS 5.2.24.2 The manual depressurization system shall be demonstrated OPERABLE: l

a. 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 valve actuation nitrogen supply pressure from the regulator to be 35 + 5 psig.

b. Each COLD SHUTDOWN, if not performed within the previous 3 months, by verifying that each steam inlet valve and each reactor vent valve is manually OPERABLE from the control room by cycling each valve through at least one complete cycle of full travel.

i LACBWR 37w WPl.6.9 l L

EMERGENCY CORE COOLING SYSTEM ALTERNATE CORE SPRAY SYSTEM LIMITING CONDI_TIO,N, _FOR OPER_ATI_0N_ _

4.2.24.3 The alternate core spray (ACS) system shall be OPERABLE with: l

a. Two OPERABLE diesel driven ACS pumps, each with a separate fuel storage tank containing a minimum of 270 gallons of fuel for pump 1A and 108 gallons of fuel for pump 1B.

b. OPERABLE redundant control valves, and

c. An OPERABLE flow path capable of taking suction from the Mississippi River and transferring the water to the reactor pressure vessel.

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

ACTION:

a. With one of the above required diesel driven ACS pumps and/or redundant control valves inoperable, POWER OPERATION may continue provided that the high pressure core spray system is OPERABLE; restore two pumps and both redundant control valves to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

b. In the event the ACS system is actuated and injects water into the reactor coolant system, a Special Report shall be prepared and submitted to the Commission pursuant to Specification 6.9.2 within 90 days describing the circumstances of the actuation and the total accumulated actuation cycles to date.

SURVEIL _LANC_E _REQU_IREMENTS 5.2.24.3 The alternate core spray system shall be demonstrated OPERABLE: l

a. Each COLD SHUTDOWN, if not performed within the previous 3 months, by cycling each power operated or automatic valve in the flow path through at least one complete cycle of full travel.

LACBWR 37x I WPl.6.9

EMERGENCY CORE COOLING SITRVE I LLANC,E_REQU_I_REME,QS_(,C,o,n,t,1,nue_d ) __ __

b. At least once per 18 months, during shutdown, by:

1. Performing a system functional test which excludes actual injection of coolant into the reactor vessel, but which includes simulated automatic actuation of the system throughout its emergency operating sequence, and:

(a) Verifying that each:

(1) Automatic valve in the flow path actuates to its correct position upon actuation of a low reactor water level signal coincident with a high containment pressure signal, (2) Automatic valve closes upon deactuation of the low reactor water level signal, and (3) Automatic valve reopens upon reactuation of the low reactor water level signal.

(b) Verifying that each diesel driven ACS starts automatically upon receipt of a high containment pressure signal.

2. Verifying that each diesel driven ACS pump operates for greater than or equal to 20 minutes with a pressure greater than or equal to 90 psig, as measured by PI-38-35-801, at a flow rate greater than or equal to 900 gpm.

c. Prior to startup during each refueling shutdown by verifying that each valve, manual or automatic, in the flow path that is not locked, sealed or otherwise secured in position, is in its correct position.

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EMERGENCY CORE CO9 LING SYSTEM OVERHEAD STORAGE TANK LIMITING CONDITION FOR OPERATION 4.2.24.4 The overhead storage tank shall be OPERABLE with: I

a. A minimum contained water volume of 15,000 gallons, equivalent to a level of 40 inches.

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, 3, and 4.

ACTION:

a. With the overhead storage tank inoperable:

(1) In OPERATIONAL CONDITION 1, 2 or 3, declare the HPCS system high pressure core spray mode inoperable and be in at least HOT SHUTDOWN within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

(2) In OPERATIONAL CONDITION 4, declare the HPCS system low pressure core spray mode inoperable and suspend all operations that have a potential for draining the reactor vessel.

SURVEIL _LAN,C,F; REQUIREM_ENIS 5.2.24.4 The overhead storage tank shall be demonstrated OPERABLE by: )

a. At least once per 7 days, verifying the minimum contained water volume in the tank.

b. At least once per 18 months, verifying that the demineralized water makeup valve opens when tank level is:

(1) Greater than or equal to 80 inches with the makeup valve control switch in the open position, and (2) Greater than or equal to 50 inches with the makeup valve control switch in the closed position.

LACBWR 37z l WPl.6.9 .

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EMERGENCY CORE COOLING SYSTEMS BASES _ ,,,,,,_

4/5.2.24 EMERGENCY CORE COOLING SYSTEMS l The OPERABILITY of two independent ECCS systems, the high pressure core spray (HPCS) system and the alternate core spray (ACS) system with the manual depressurization system (MDS), ensures that sufficient emergency core cooling capability will be available in the event of a loss-of-coolant accident (LOCA) assuming the loss of one ECCS system through any single failure consideration.

Either system is capable of supplying sufficient core cooling to limit the peak cladding temperatures within acceptable limits for all postulated break sizes ranging from the double ended break of the largest reactor coolant system cold leg pipe downward.

4/5.2.24.1 HIGH PRESSURE CORE SPRAY SYSTEM j The high pressure core spray (HPCS) system high pressure core spray mode is provided to assure that the reactor core is adequately cooled to limit fuel clad temperature in the event of a small break in the reactor coolant system and a loss-of-coolant which does not result in rapid depressurization of the reactor vessel. The HPCS system high pressure core spray mode permits the reactor to be shut down while maintaining sufficient reactor vessel water level inventory until the vessel is depressurized. The HPCS system high pressure core spray mode continues to operate until reactor vessel pressure is below the pressure at which alternate core spray system operation maintains core cooling. The HPCS system high pressure core spray mode consists of two pumps, and associated valves and piping. The pumps each have the capacity to deliver 50 gallons per minute to the reactor at a pressure in excess of reactor operating pressure. The system is actuated by automatically starting the pumps on a signal from either one of two reactor water level sensing channels.

A function of the HPCS system is the low pressure core spray mode which provides, by gravity feed which bypasses the HPCS pumps, water from the OHST to the reactor vessel when the reactor is at low pressure or the reactor vessel head is removed, to provide a source for flooding of the core in case of accidental draining. The HPCS system low pressure core spray mode is actuated on a coincidence signal from the reactor pressure and reactor water level sensing channels.

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EMERGENCY CORE COOLING SYSTEMS BASES _ _ _ , _ , _ , , , , , _ __, _

4/5.2.24.2 MANUAL DEPRESSURIZATION SYSTEM l AND 4/5.2.24.3 ALTERNATE CORE SPRAY SYSTEM Along with the HPCS system, adequate core cooling is assured by the demonstrated OPERABILITY of the manual depressurization system (MDS) and the l alternate core spray (ACS) system.

i The MDS is manually initiated. It serves to reduce reactor pressure rapidly so that the ACS system can perform its function. The MDS provides the ACS j system with the capability of performing its function in both long-term and short-term cooling modes.

i i The ACS system is provided to assure that the core is adequately cooled following a loss-of-coolant accident. The system is comprised of two diesel-driven pumps and associated valves and piping. The water supply for

the ACS system is the Mississippi River. The ACS system is capable of providing 900 gpm of cooling water to the reactor when reactor pressure drops to approximately 50 psig.

Two Containment Building pressure sensors and two reactor water level sensors 4 provide the signals to actuate operation of the ACS system. A containment I

pressure of 5 psig will cause a sensor to generate a signal to actuate and automatically start its respective pump. A motor operated valve associated i with each pump will be opened on a low reactor water level signal from either of two reactor water level sensors coincident with high Containment Building pressure. Similarly the second pump will start and the valve will open when i the respective set of instruments generate the required signals. The motor i operator for one valve is supplied with a-c power from an essential power bus, the motor operator for the other valve is supplied with d-c power. The ACS l system is capable of remote manual start from the control room.

i The surveillance requirements provide adequate assurance that MDS will be j OPERABLE when required. A complete functional test results in reactor i blowdown and therefore is only performed during shutdown.

The surveillance requirements provide adequate assurance that the ACS system I will be OPERABLE when required. All active components are not testable and a full functional test requires reactor shutdown.

4/5.2.24.4 OVERIIEAD STORAGE TANK l

l The OPERABILITY of the Containment Building overhead storage tank (OHST) as part of the ECCS ensures that a sufficient supply of water is available for-

injection by the HPCS system in the event of a LOCA. Demineralized water for the high pressure core spray system is supplied from the 42,000-gallon overhead storage tank, located in the dome of the Containment Building. The high pressure core spray cooling system is connected near the bottom of the j tank. The containment building spray system is connected to a standpipe within the tank with the top of the standpipe located so that 15,000 gallons j are reserved for the high pressure core spray system. The demineralized water system replenishes the OMST for long term cooling. The contained water volume

limit includes an allowance for water not usable because of tank discharge line location or other physical characteristics.

LACBWR 37bb WPl.6.9