ML20076D517

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Proposed Tech Spec 4.5.6.2.b Re Deletion of Autoclosure Interlock on RHR Suction Valves
ML20076D517
Person / Time
Site: South Texas  STP Nuclear Operating Company icon.png
Issue date: 07/17/1991
From:
HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20076D515 List:
References
NUDOCS 9107290214
Download: ML20076D517 (6)
v • d • e


Text

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ATTACilMENT 1 PROPOSED IMPLEMENTATION FOR UNIT 2 AT 2RE02 l

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. SbML- AE 3 217 IHfEucY ccRr CODt!NG SY51tH5 PAGE l 0F _ D 3/4.5.6 Ris! DUAL HEAT REMOVAL (RHR) 5Y5i[4 kl$ MOM 2110101AIIEUlM-A -- .- -- - =_

3.5.6 Three independent Residual Heat Removal (RHR) loops shall be OPERABLE  :

with each loop comprised of:

4. Dr.e OPERABLE RHR pump, t.

One OPERABLE RHR heat e>. changer, and c.

+0ne OPERABLE flowpath capable of taking suction from its associated RCS hot leg and discharging to its associated RCS cold leg."

,APPLIC ABI L ITY: MODES 1, 2 and 3.

M110m e.

With one RHR loop inoperable, restore the required loop to OPERABLE natus 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 in H01 SHUT 00WN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

b.

With two RHR loops inoperable, restore at least two RHR loops to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT STAN0BY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTOOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

I c.

With three RHR loops inoperable, immediately initiate corrective action to restore at least one RHR loop to OPERABLE status as soon as possible.

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4. 5. 6.1 ments of Each RHR loop4.0.5 Specification shall be demonstrated OPERACLE pursuant to the require-4.5.6.2 At least once per-18 months by verifying automatic isolation &and inter-lock action of the RHR system from the Reactor Coolant System to ensure that:

6.

With a simulated or actual Reactor Coolant System pressure signal greater than or equal to 350 psig, the interlocks prevent the valves from being opencJ, and MXr b. With a simulated or actual Reactor Coolant System pressure signal less than or equal to 700 psig, the interlocks will cause the valves to automatically close.

" Valves HOV-0060 A, B, and C and MOV-006) A, B, and C tr,ay have poner removed to support the FHAR (Fire Hazard Analysis Report) assurptions,

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S1 til AE 32 2 9 EMERGENCY CORE C00LiliG SYSllMS l PAGE 1 .0F 2 l, i fA$[i__ ,_ __ _ ,. _ _ _ . _ ,, _ _ _ _ _ . _ , _ _ _

3/4.b.6 RFSIDUAL HEAT REMOVAL (RHR) SYSTEM The-0PERABIL11Y of the RHR system ensures adequate heat removal capabili-ties for Long-Term Core Cooling in the event of a small-break loss-of coolant accident (LOCA), an isolatable LOCA, or a secondary break in H0 DES 1, 2, and 3. - I lhe limits on the OPERABILITY of the RHR system ensure that at least one RHR loop is available for cooling including single active failure criteria.

The surveillances ensure that RHR s overpressure protection system signal.%ystem isolation valves close upon an k

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SOUTH TEXAS - UN1151 & 2 8 3/4 5-3 .

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  • l ATTACllMENT 2 PROPOSED IMPLEMENTATION FOR UNIT 1 AT 1RE04 1

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3/4.5 6- Ris10UAL HEAT REMOVAL (RHR) SYSTEM LIMIUEC_0MLil10! DOR _0?JRA110N __

3.5.6 Three independent Residual Heat Removal (RHR) loops shall be OPERABLE with each loop comprised of:

a. Dr.e OPERABLE RHR pump,
b. One OPERABLE RHR heat exchanger, and
c. =0ne OPERABLE flowpath capable of taking suction from its associated RCS hot leg and discharging to its associated RCS cold leg.*

APPLICABillTY: MODES 1, 2 and 3.

ACTION:

a.

With one RHR loop inoperable, restore the required loop to OPERABLE states 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 lesst 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 in HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

L' .

With two RHR loops inoperable, restore at least two RHR loops to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN 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 three RHR loops inoperable, immediately initiate corrective action to restore at least one RHR loop to OPERABLE status as soon as possible.

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4. 5. 6.1 Each RHR loop shall be demonstrated OPERABLE pursuant to the require-ments of Specification 4.0.5.
4. 5. 6. 2 At least once per 18 months by verifying automatic hhhen 'm3 inter-lock action of the RHR system from the Reattor Coolant System to ensure that:
a. With a simulated or actual Reactor Coolant System pressure signal greater than or equal to 350 psig, the interlocks -

prevent the valves from being opened, Q

b. Wittra Timtriated-oNetuab-Reactor-Coolent4yttem-pressur+---

a4 9naL Isss-than-oe-equal 40-700-pS49,_the 4nter4oeks-wH-t-tause-the--v44 ver-ttnstMattea44y-cl os er-

" Valves MOV-0060 A, B, and C and MOV-0061 A, B, and C may have power removed

  • to support the EHAR (Fire Hazard Analysis Report) assumptions.

SOUTH TEXAS - UNITS 1 & ? 3/4 5-11 Unit 1 - A+eneent No. 4 j

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3/4.5.6 Rf 510UAL HEAT R[MOVAL (RHR) SYSTEM The OPERABilllY of the RHR system ensures adequate heat removal capabili-ties for Long-Term Core Cooling in the event of a small-break loss-of coolant accident (LOCA), an isolatable LOCA, or a secondary break in H0 DES 1, 2, and 3 -

The limits on the OPERABillTY of the RHR system ensure that at least one RHR loop is available for cooling including single active failure criteria.

4 he-s urv e i l l anc e s-ensure-t ha t- RHR-sy s tem 401 a ti on-va l ves-c l os Hpon-a n--

+verpressure protection-Systesignalt-l l

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i 50VlH IEXA5 - UN1151 & 2 B 3/4 5-3 .

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