ML20151T162

Proposed Tech Specs 3.4.9.3 Re Cold Overpressure Mitigation Curve Associated W/Replacement SGs

ML20151T162
Person / Time
Site:	South Texas
Issue date:	08/31/1998
From:	HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20151T159	List: ML20151T162 NOC-AE-00203, Application for Amends to Licenses NPF-76 & NPF-80, Incorporating Changes to Reflect Revised Cold Overpressure Mitigation Curve Associated W/Replacement SGs Into TS 3.4.9.3, Overpressure Protection Sys
References
NUDOCS 9809090265
Download: ML20151T162 (4)

Text

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NOC-AE-0163 Page 2 of 5 PROPOSED CHANGES TO TECHNICAL SPECIFICATIONS Technical Specification Page 3/4 4-37 is marked-up to identify the proposed change and is included in this attachment with'new insert. (NOTE: Technical Specification Page 3/4 4-36 has I

no changes, but is also included to assist in review of this proposed Technical Specification change.)

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l 9909090265 980831 PDR ADOCK 05000498 P

PDR g

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1 Wo CAM 9es REACTOR C0OLANT SYSTEM j

l OVERPRESSURE PROTECTION SYSTEMS l

i LIMITING CONDITION FOR OPERATION j

3.4.9.3 At least one of the following Werpressure Protection Systems shall be OPERABLE:

a.

Two power-operated reitef valves (PORVs) with lift settings which

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t do not exceed the limit established in Figure 3.4-4, or l

b.

The Reactor Coolant System (RCS) depressurized with an RCS vent of i

greater than or equal to 2.0 square inches.

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APPLICABILITY: H0 DES 4'and S. and MODE 6 when the head is on the reactor.

vessel.

ACTION:

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a.

With one PORV inoperable in H00E 4, restore the inoperable PORV to OPERABLE status within 7 days or depressurize and vent the RCS j

through at least a 2.0 square inch vent within the next 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

b.

With one PORV inoperable in H0 DES S or 6 with the head on the reactor vessel, restore the inoperable PORV to OPERABLE status within 24 l

hours, or complete depressurization and venting of the RCS through j

at least a 2 square inch vent within the next 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />."

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c.

With both PORVs inoperable,'depressurize and vent the RCS through I

at least a 2.0 square inch vent within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.*

d.

In the event either the PORVs or the RCS vent (s) are used to mitigate I

an RCS pressure transient, a Special Report shall be prepared and submitted to the Commission pursuant to specification 6.9.2 within 30 days. The report shall describe the circumstances initiating the transient, the effect of the PORVs or RCS vent (s) on the transient, l-and any corrective action necessary to prevent recurrence.

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The provisions of Specification 3.0.4 are not applicable.

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~*This ACTION may be suspended for up to 7 days to allow functional testing to verify PORV operability. During this test period, operation of systems or L

components which could result in an RCS mass or tamperature increase will be administratively controlled. During the ASME stroke testing of two inoperable PORVs, cold overpressurization mitigation will be provided by two RHR discharge t

relief valves associated with two OPERABLE and operating RHR loops which have L

the auto closure interlock bypassed Ecr deleted). If one P0RV is inopcrable.

cold overpressure mitigation will be provided by the OPERABLE PORV and one RHR J

discharge reitef valve associated with an CPERABLE and operating RHR ltop-

~ hich has the auto closure interlock bypassed (or deleted).

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l WW TrVAC - IINITS 1 & 2 3/4 4-36 Unit 1 - A.tendment No. 31

(\\nu 2 -

A.,. 3mt it-22 l,

THE 2 PUMP AND 4 PUMP CURVE 5 000COE AT GEATER THAN OR EGJAL 10 2007 a00 I

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-E a00 40 100 200 300 400 TRTD - AUCT10NEERED LOW WEASURED RCS TEMPERATURE ('F) acee pCPj6ce wifn I

2 PUMP OPDtAll0N 4 pump -=

Xusegf f o-1ossano nw. o )

FIGURE 3.4-4 NOMItiAL MAXIMUM ALLOWABLE PORV SETPOINT FOR THE COLD OVERPRESSURE SYSTEM SOUTH TEXAS - UNITS 1 & 2 3/4 4-37 Unit 1 - Amendment No. 63 Unit 2 - Amendment No. 52

MAXIMUM ALLOWABLE PORV SETPOINT TE 2 PUh4) AND 4 PUM) CURVES CONK:0E AT GREATER TIMN 200 DEG F 750 iip 700.

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- _____.' ______;_______ ;-______l____. ;.____.'.._____

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, 800.

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550.

500 50 100 150 200 250 300 350 400 t

T,,- AUCTIOMEND LOW MEASURED RCS TBWPERATURE(DE3 F)

...... 4 FUM) OFERATION 2 PUM'OPERATON I

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