ML20151U365

Proposed Tech Specs TS.3.1-5,TS.4.18-1 & B.4.18-1,clarifying SRs & LCOs for Operability for Reactor Coolant Vent Sys

ML20151U365
Person / Time
Site:	Prairie Island
Issue date:	09/04/1998
From:	NORTHERN STATES POWER CO.
To:
Shared Package
ML20151U332	List: ML20151U327 ML20151U347 ML20151U365
References
NUDOCS 9809100367
Download: ML20151U365 (7)

Text

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1 TS.3.1-5 3.1. A.2.c. (2). (a) One PORV'may be inoperable for 7 days.

If these conditions cannot be met, depressurize and vent the reactor coolant system through at least a 3 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 both PORVs inoperable, complete depressurization and venting of the RCS through at least a 3 square inch vent within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

(3) Reactor Coolant System average temperature below the temperature specified in the PTLR for disabling both safety injection pumps With Reactor Coolant System temperature less than the temperature specified in the PTLR for disabling both safety injection pumps, when the head is on the reactor vessel and the reactor coolant system is not vented through a 3 square inch or larger vent; both Pressurizer power operated relief valves (PORVs) shall be OPERABLE (except as specified in 3.1. A.2.c. (3). (a) and 3.1. A. 2. c. ( 3 ). (b) below) with the Over Pressure Protection System enabled, the associated block valve open, and the associated backup air supply charged.

(a) One PORV may be inoperable for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

If these conditions cannot be met, depressurize and vent the reactor coolant system through at least a 3 square inch vent within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

(b) With both PORVs inoperable, complete depressurization and venting of the RCS through at least a 3 square inch vent within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

3.1.A.3 Reactor Coolant Vent System

a. A reactor shall not be made or maintained critical nor shall reactor coolant system average temperature exceed 200*F unless Reactor Coolant Vent System paths from both the reactor vessel head and pressurizer steam space are OPERABLE and closed (except as specified in 3.1.A.3.b and 3.1.A.3.c below).

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b. During STARTUP OPERATION and POWER OPERATION, any one of the following conditions of inoperability may exist for each unit provided STARTUP OPERATION is discontinued until OPERABILITY is restored.

If any one of these conditions is not restored to an OPERABLE status within 30 days, be in at least HOT SHUTDOWN 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 COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> (1) Bitherraboth of the parallel vent valves in the reactor vess' ~1'hsad vent path aresinoperable, or therassociated' vent e

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(2) EitherFaboth of the parallel vent valves in the pressurizer iienG5tli areyinoperable, ortthetassociatedmventepathtsegment isylinoperablejgor

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(3) The vent valve to the pressurizer relief tank discharge line or;the; associate _d gentgpath;segmentgisjinoperable, or (4) The vent valve to the containment atmospheric discharge line OEthe:assogiated;ventfpathisegment71sjinoperable.

c. With no Reactor Coolant Vent System path OPERABLE, restore at least one vent path 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 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

9909100367 990904 I PDR ADOCK 050002821 P

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TS.4.18-1 4.18 REACTOR COOLANT VENT SYSTEM PATHS Applicability Applies to the surveillance performed on the Reactor Coolant Vent System paths to verify OPERABILITY.

Objective To assure that the capability exists to vent noncondensible gases from the Reactor Coolant System that could inhibit natural circulation core cooling.

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B.4.18-1 I

4.18 REACTOR COOLANT VENT SYSTEM PATHS Bares 1

The manual valves in the Reactor Coolant Vent System are blocked and

. tagged in the open position to eliminate the possibility that operation i

of the system could be blocked by the inadvertent closure of any of the system manual valves.

The cycling of each solenoid operated vent valve once each refueling j

CYCA*ligte5valfgensures the ability of these valves to open if required to vent the Reactor Coolant System. More frequent cycling of the valves is not practical because they cannot be isolated from the Heactor j

Coolant System while the plant is operating.

Reactor Coolant Vent System flow will be determined qualitatively as prrt cf " e ercri fill - " fert prece urer felle:>1n; erch refuelir;.

d Thir :1111 tomassure that there are no blockages in the Reactor Coolant s #

Vent Sys tem piping. L*Thi. s s ma.y~it be edo.._n..e.,m+1_nraa' p.i_ece..m_ef _f a_shi_onn...w.h. ere4.t.._he.

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i EXHIBIT C PRAIRIE ISLAND NUCLEAR GENERATING STATION License Amendment Request dated September 4,1998 Appendix A, Technical Specification Pages Revised Pages TS.3.1-5 TS.4.18-1 B.4.18-1 l

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1

c TS.3.1-5 de 3.1. A.2.c. (2). (a) One PORV may be inoperable for 7 days.

If these conditions cannot be met, depressurize and vent the reactor coolant system through at least a 3 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 />.

l (b) With both PORVs inoperable, complete depressurization and Venting of the RCS through at least a 3 square inch vent within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

(3) Reactor Coolant System average temperature below the temperature specified in the PTLR for disabling both safety injection pumps With Reactor Coolant System temperature less than the temperature specified in the PTLR for disabling both safety injection pumps, l

when the head is on the reactor vessel and the reactor coclant system is not vented through a 3 square inch or larger vent; both Pressurizer power operated relief valves (PORVs) shall be OPERABLE (except as specified in 3.1. A.2.c. (3). (a) and 3.1. A. 2. c. (3). (b) below) with the Over Pressure Protection System enabled, the associated block valve open, and the associated backup air supply charged.

(a) One PORV may be inoperable for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

If these conditions cannot be met, depressurize and vent the reactor coolant system through at least a 3 square inch vent within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

(b) With both PORVs inoperable, complete depressurization and venting of the RCS through at least a 3 square inch vent within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

3.1.A.3 Reactor Coolant Vent System

a. A reactor shall not be made or maintained critical nor shall reactor coolant system average temperature exceed 200*F unless Reactor Coolant Vent System paths from both the reactor vessel head and pressurizer steam space are OPERABLE and closed (except as specified in 3.1.A.3.b and 3.1.A.3.c below).

b. During STARTUP OPERATION and POWER OPERATION, any one of the following conditions of inoperability may exist for each unit provided STARTUP OPERATION is discontinued until OPERABILITY is restored.

If any one of these conditions is not restored to an OPERABLE status within 30 days, be in at least HOT SHUTDOWN 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 COLD SHUTDOWN within the following 30 hour3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />s:

(1) Either both of the parallel vent valves in the reactor-vessel head vent path are inoperable, or the associated vcnt path segment is inoperable, or (2) Either both of the parallel vent valves in the pressurizer vent path are inoperable, or the asnociated vent path segment is inoperable, or (3) The vent valve to the pressurizer relief tank discharge line or the associated vent path segment is inoperable, or j

(4) The vent valve to the containment atmospheric discharge line or the associated vent path segment is inoperable.

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c. With no Reactor Coolant Vent System path OPERABLE, restore at least one vent path to OPER?BLE 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 tha next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and COLD SHUTDOWN l

within the following 30 hourt.

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1 TS.4.18-1 i

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,. 4.18 REACTOR COOLANT VENT SYSTEM PATHS i

Applicability i.'

Applies to.the surveillance performed on the Reactor Coolant Vent System

.l paths to verify OPERABILITY, Objective a

To assure that the capability exists'to vent noncondensible gases from the i

i Reactor Coolant System that could inhibit natural circulation core cooling.

5 Specification Each Reactor Coolant System vent path shall be demonstrated OPERABLE.at least once each refueling cycle interval by:

. Verifying all manual isolation valves in each vent path are blocked and j

a.

i tagged in the open position, l

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Cycling each solenoid operated valve in each vent path through at least one complete cycle of full travel from the control room, and

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Verifying' flow through each Reactor Coolant System vent path.

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B.4.18-1 t

4.18 REACTOR COOLANT VENT SYSTEM PATHS e

Bases The' manual valves in the Reactor Coolant Vent System are blocked and tagged in the open position to eliminate the possibility that operation of the system could be blocked by the inadvertent closure of any of the F

system manual valves.

.The cycling of each' solenoid operated vent valve once each refueling cycle interval ensures the ability of these valves to open if required l

to' vent the Reactor Coolant System. More frequent cycling of the. valves is not practical because they cannot be isolated from the Reactor i

Coolant System while the plant is operating.

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Reactor Coolant Vent System flow will'be determined qualitatively to l

assure that there are no blockages in the Reactor Coolant Vent Systen

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piping. This may be done in a piecewise fashion, where the flow verification for different pipe segments may be performed by different

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procedures using different fluids.

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