ML20148C117

Proposed Tech Spec Deleting Surveillance Requirement 4.5.1.1d Which Requires Verification That Each SI Accumulator Isolation Valve Opens Automatically When Actual or Simulated RCS Pressure Signal Exceeds P-11 Setpoint

ML20148C117
Person / Time
Site:	South Texas
Issue date:	03/11/1988
From:	HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20148C112	List: ML20148C117 ST-HL-AE-2534, Application for Amend to License NPF-71,deleting Surveillance Requirement 4.5.1.1d Requiring Verification That Each Safety Injection Accumulator Isolation Valve Opens Automatically When RCS Pressure Exceeds P-11.Fee Paid
References
NUDOCS 8803220281
Download: ML20148C117 (3)

Text

, .

3/4.5 TAERGENCY CORE COOLING SYSTEMS

'7) .

3/4.5.1 ACCUMULATORS LIMITING CONDITION FOR OPERATION

3.5.1 EachSafetyInjectionSystemaccumulatorshallbeOPERABLEwith

a. The isolation valve open and power removed,

b. A contained borated water volume of between 8800 and 9100 gallons,

c. A boron concentration of between 2400 and 2600 ppa, and

d. A nitrogen cover pressure of between 590 and 670 psig.

APPLICABILITY: MODES 1, 2, and 3*.

ACTION:

a. With one accumulator inoperable, except as a result of a closed isolation valve or the boron concentration outside the required ,

I limits, restore the inoperable accumulator 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 STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressurizer pressure to less than 1000 psig within the follow-ing 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />,

b. With one accumulator inoperable due to the isolation valve being

! closed, either open the isolation valve 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 STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressurizer pressure to less than 1000 psig within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

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c. With the boron concentration of one accumulator outside the required limit, restore the boron concentration to within the required limits 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 STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressurizer pressure to less than 1000 psig within the l

following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

SURVEILLANCE RE0VIREMENTS 4.5.1.1 ',Each accumulator 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:

f 1) Verifying, by the absence of alarms, the contained borated water volume and nitrogen cover pressure in the tanks, and i 2) Verifying that each accumulator isolation valve is open.

b. At least once per 31 days and within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> after each solution volume increase of greater than or equal to 1% of tank volume by verifying the boron concentration of the accumulator solution; and

• Pressurizer pressure above 1000 psig.

8803220281 880311 3/4 5,1 PDR ADOCK 05000498 p DCD

EMERGENCY CORE COOLING SYSTEMS SURVEILLANCE RE0VIREMENTS (Continued 1

c. At least once per 31 days when the RCS pressure is above 1000 psig by verifying that power to the isolation valve operator is removed.

h At least once per 18 months by verifying that each accumulator isola-tion valve opens automatically under each of the following conditions:

1) When an actual or a simulated RCS pressure signal exceeds the P-11 (Pressurizer Pressure Block of Safety Injection) Setpoint, and

2) UponreceiptofaSafetyInjectiontestsignal.

4.5.1.2 Each accumulator water level and pressure channel shall be demon-strated OPERABLE:

a. At least once per 31 days by the performance of an ANALOG CHANNEL OPERATIONAL TEST, and

b. At least once per 18' months by the performance of a CHANNEL CALIBRATION.

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SOUTH TEXAS - UNIT 1 3/4 5-2

. STP FSAR

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3. The interlocks for the accumulator motor-operated valves meet the appro-priate qualification standards (IEEE 323 and 382), as discussed in Section 3.11.

The design of the interconnection of these signals to the accumulator isola-tion valve meets the following criteria established in previous NRC positions (Branch Technical Position ICSB 4) on this matter: 43

1. Automatic opening of the accumulator valves when (1) the primary coolant system pressure exceeds a preselected value specified in the Technical Specifications or (2) an SI signal has been initiated. Both signals are l43l2 provided to the valves.

2. Utilization of an SI signal to automatically remove (override) any bypass l2 features that are provided to allow an isolation valve to be closed for short periods of time ahen the RCS is at pressure. As a result of the confirmatory SI signal, isolation of an accumulator with the reactor at pressure is acceptable. 2 The control circuit for these valves is shown on Figure 7.6-3. The valves and control circuits are further discussed in Sections 6.3.2 and 6.3.5.

The Safety Injection System (SIS) accumulator discharge isolation valves are motor-operated, normally open valves can be are controlled from the main con- l43 trol board.

These valves are interlocked such that:

1. They open automatically on receipt of an SI signal with the main control l2 board switch in either the "AUT0" or "CLOSE" position.

2. They open automatically whenever the RCS pressure is above the SI l30 unblock pressure (P-11) only when the main control board switch is l2 in the "AUT0" position.

3. They cannot be closed as long as an SI signal is present. 2 The main control board switches for these valves are three position switches which provide a "spring return to Auto" from the open position and a "maintain position" for the closed position.

The "maintain closed" position is required to provide an administratively controlled manual block of the automatic opening of the valve at pressure above the S1 unblock pressure (P-11). The manual block or "maintain closed" l2 position is required when performing periodic check valve leakage tests when the reactor is at pressure and at hot standby. The valve is closed from the control board by placing it in the "maintain closed" position. ^

..: ;;r: :f th:

4 :k t.3h.: 1- % . ene uk e reactor prc :;re 13 ah ;; n a le a gas;ura, 1v d i :::::d ;; th ::in con;; 1 be M g ,

h; ;utoaatic ep;n en-p;;;;ur; i l2 h u.= wi ih: 1v idis tion li; hts. Administrative control is required to ensure that any accumulator valve that has been closed at pressures above the SI unblock pressure is returned to the "AVI0" position. Werific tien th: the

• cir. o u t vus ic all-j return; te it: n:rmal full : pen peritien 1. 1 : :: quired.

l2 g 7.6-4 Amendment 43