ML20070N461

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Proposed Tech Specs Supporting Implementation of Proposed Mod 5274 to Replace Unit 2 Containment Atmospheric Dilution Sys & Containment Atmospheric Control Sys Analyzers
ML20070N461
Person / Time
Site: Peach Bottom  Constellation icon.png
Issue date: 04/27/1994
From:
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20070N457 List:
References
NUDOCS 9405060229
Download: ML20070N461 (13)
v • d • e


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ATTACHMENT 2 PEACH BOTTOM ATOMIC POWER STATION UNITS 2 AND 3 )

Docket Nos. 50-277 l 50-278 I Ucense Nos. DPR-44 DPR 56 TECHNICAL SPECIFICATION CHANGE REQUEST No. 92-14 Ust of Attached Pages

. Units 2 and 3 Unit 2 77a 172 78a 173 86a 93 194 94o5060229 940427 PDR ADOCK 05o00277

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TABLE 3.2.F (Cont'd) - SURVEILLANCE INSTRUMENTATION ,

Minimum No.

of Operable Type Instrument Indication Parameter Instrument and Range Action

  • Item Channels 11 2 Suppression Chamber LR-8(9)123A,B Recorder 1-21 ft. (10) (11)

Water Level (wide range)

Control Rod Position N/A 28 Volt Indicating )

12 1 Lights ) (1) (2) (3) (4)

)

13 1 Neutron Monitoring N/A SRM, IRM, LPRM, )

0-100% )

14 1 Safety-Relief Valve POAM-2(3)-2-71A-L Acoustic or (5)

Position Indication TE-2(3)-2-ll3A-L Thermocouple 15 2 Drywell High RR-8(9)l03A, B Recorder Range Radiation 1-1E(+8) R/hr (7)

Monitors I

O 16 1 Main Stack High Range RR-0-17-051 Regorder 11 T Radiation Monitor 10 to 10 CPS (7)

(Log Scale) 17 1 Reactor Building Roof RR-2979 (Unit 2) Regarder 13 Vent High Range Radiation RR-3979 (Unit 3) 10 to 10 CPM (7)

Monitor (Log Scale) 18 2 Drywell Hydrogen 2(3)AC872, 2(3)8C872 Analyzer and Recorder (13)

Concentration Analyzer XR-8(9)0411A, 0-30% volume and Monitor XR-8(9)0411B 19 2 Suppression Chamber 2(3)AC872, 2(3)BC872 Analyzer and Recorder (13)

Hydrogen Concentration XR-8(9)0411A, 0-30% volume Analyzer and Monitor XR-8(9)0411B o Notes for Table 3.2.F appear on pages 78 and 78a.

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TABLE 3.2.F (Cont'd) - SURVEILLANCE INSTRUMENTATION , . .

Minimum No.

of Operable Type .

Instrument Indication Parameter Instrument and Range Action

  • Item Channel s 11 2 Suppression Chamber LR-8(9)123A, B Recorder 1-21 ft. (10) (11)

Water Level (wide range)

Control Rod Position N/A 28 Volt Indicating )

12 1 Lights ) (1) (2) (3) (4)

)

13 1 Neutron Monitoring N/A SRM, IRM, LPRM, ) -

0-100% )

14 1 Safety-Relief Valve P0AM-2(3)-2-71A-L Acoustic or (5)

Position Indication TE-2(3)-2-ll3A-L Thermocouple 15 2 Drywell High RR-8(9)l03A, B Recorder Range Radiation 1-1E(+8) R,nr (7)

Monitors

' 16 1 Main Stack High Range RR-0-17-051 Regorder 11 y Radiation Monitor 10 to 10 CPS (7)

' (Log Scale) 17 1 Reactor Building Roof RR-2979 (Unit 2) Regorder 13 Vent High Range Radiation RR-3979 (Unit 3) 10 to 10 CPM (7)

Monitor (Log Scale) 18 2 Drywell Hydrogen 2(3)AC872,2(3)BC872 Analyzer and Recorder (13)

Concentration Analyzer XR-8(9)0411A, 0-30% volume and Monitor XR-8(9)04118 19 2 Suppression Chamber 2(3)AC872,2(3)BC872 Analyzer and Recorder (13)

Hydrogen Concentration XR-8(9)0411A, 0-30% volume Analyzer and Monitor XR-8(9)04118

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o Notes for Table 3.2.F appear on pages 78 and 78a.

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l PBAPS Unit 2 NOTES FOR TABLE 3.2.F (Cont'd)

9) If no channels are oporable, continued operation is permissible during tho succooding 7 days, provided both Drywell Pressure instruments (0-70 psig) are operablo; otherwiso, restore the inoporable channol(s) to operable status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or bo 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 />.
10) With the number of operablo channels loss than the minimum I number of instrumentation channels shown in Table 3.2.F, continued operation is permissible during the succeeding 30 i

l days, provided both narrow range instruments monitoring the same variable are operable; otherwise, restore the i inoperable channel to operable status within 7 days or be in l 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 />.

11) If no channels are operable, continued operation is permissible during the succeeding sovon days, provided both  ;

narrow range instruments monitoring the same variable are  ;

operable; otherwise, rostore the inoperable channel (s) to operable status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-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 />. l

12) The instrument rango may be greater than the range listed in Table 3.2.F provided that (1) the rango includes the upper and lower range limits specified in Table 3.2.F, and (2) the I

rango does not exceed throo times the range specified in Table 3.2.F. )

13) With only 1 channel operable to monitor hydrogen concentration, restore the inoperable channel to operable j status within 30 days or bo 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 />.

With no channels operable to monitor hydrogon concentration, l restore an inoperable channel to operable status within 7 days 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 />.

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PBAPS Unit 3 l

NOTES FOR TABLE 3.2.F (Cont'd)

9) If no channels are operable, continued operation is permissible during the succeeding 7 days, provided both Drywell Pressure instruments (0-70 psig) are operable; l I

otherwise, restore the inoperable channel (s) to operable status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-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 />. ,

i

10) With the number of operable channels less than the minimum number of instrumentation channels shown in Table 3.2.F, )

continued operation is permissible during the succeeding 30 l

days, provided both narrow range instruments monitoring the l same variable are operable; otherwise, restcre the i inoperable channel to operable status within 7 days or be in l 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 />.

11) I! no channels are operable, continued operation is

! permissible during the succeeding seven days, provided both narrow range instruments monitoring the same variable are operable; ntherwise, restore the inoperable channel (s) to l operable -7.ttus within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at least Hot l Shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

12) The instrument cange may be greater than the range listed in Table 3.2.F prcvided that (1) the range includes the upper and lower range limits specified in Table 3.2.F, and (2)'the range does not exceed three times the range specified in Table 3.2.F.
13) With only 1 channel operable to monitor hydrogen concentration, restore the inoperable channel to operable status within 30 days 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 />.

With no channels operable to monitor hydrogen concentration, restore si inoperable channel to operable status within 7 days 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 />.

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- .i TABLE 4.2.F MINIMUM TEST AND CALIBRATION FREQUENCY FOR SURVEILLANCE INSTRUMENTATION Instrument Channel Calibration Frequency Instrument Check

18) Drywell High Range Radiation Monitors Once/ operating cycle ** Once/ month
19) Main Stack High Range Once/ eighteen months Once/ month Radiation Monitor 2
20) Reactor Bldg. Roof Vent Once/ eighteen months Once/ month High Range Radiation Monitor
21) Drywell and Suppression Chamber Hydrogen Quarterly *** Once/ month Concentration Analyzer and Monitor i
  • Perform instrument functional check once per operating cycle.

. p j ' ** Channel calibration shall consist of an electronic calibration of the

' channel, not including the detector, for range decades above 10R/hr and a one point calibration check of the detector below 10R/hr with an installed or portable gamma source.

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      • At least a two-point calibration using sample gas.

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l TABLE 4.2.F MINIMUM TEST AND CALIBRATION FREQUENCY FOR SURVEILLANCE INSTRUMENTATION Instrument Channel Calibration Frequency Instrument Check

18) Drywell High Range Radiation Monitors Once/ operating cycle ** Once/ month Main Stack High Range Once/ eighteen months Once/ month 19)

Radiation Monitor

20) Reactor Bldg. Roof Vent Once/ eighteen months Once/ month High Range Radiation Monitor
21) Drywell and Suppression Chamber Hydrogen Quarterly *** Once/ month Concentration Analyzer and Monitor i
  • Perform instrument functional check once per operating cycle.

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    • Channel calibration shall consist of an electronic calibration of the channel, not including the detector, for range decades above 10R/hr and a one point calibration check of the detector below 10R/hr with an installed or portable gamma source.
      • At least a two-point calibration using sample gas.

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', Unit 2 PBAPS 3.2 BASES (Cont'd)

Four sets of two radiation monitors are provided which initiate the Reactor Building Isolation function and operation of the standby gas treatment system. Four instrument channels monitor the radiation from the refueling area ventilation exhaust ducts and four instrument channels monitor the building ventilation below the refueling floor. Each set of instrument channels is arranged in a 1 out of 2 twice trip logic.

Trip settings of less than 16 mr/hr for the monitors in the refueling area ventilation exhaust ducts are based upon ini-tiating normal ventilation isolation and standby gas treatment system operation so that none of the activity released during the refueling accident leaves the Reactor Building via the normal ventilation path but rather all the activity is processed by the standby gas treatment system.

Two channels of nonsafety-related radiation monitors are provided in the main stack. Trip signals from these monitors are required only when purging the containment through the SGTS and containment integrity is required. The trip signals isolate pri-mary containment vent and purge valves greater than 2 inches in diameter to prevent accidental releases of radioactivity offsite when the valves are open. This signal is added to fulfill the requirements of item II.E.4.2(7) of NUREG-0737.

Flow integrators are used to record the integrated flow of liquid from the drywell sumps. The integrated flow is indica-tive of reactor coolant leakage. A Drywell Atmosphere Radioactivity Monitor is provided to give supporting information to that supplied by the reactor coolant leakage monitoring system. (See Bases for 3.6.C and 4.6.C)

Some of the survaillance instrumentation listed in Table 3.2.F are required to meet the accident monitoring requirements of NUREG-0737, Clarification of TMI Action Plan Requirements. This instrumentation and the applicable NUREG-0737 requirements are:

1. Wide range drywell pressure (II.F.1.4)
2. Subatmospheric drywell pressure (II.F.1.4)
3. Wide range suppression chamber water level (II . F.1. 5)
4. Main stack high range radiation monitor (II.F.1.1)
5. Reactor building roof vent high range radiation monitor (II.F.1.1)
6. Drywell hydrogen concentration analyzer and monitor (II.F.1.6)
7. Drywell high range radiation monitors (II.F.1.3)
8. Reactor Water Level - wide and fuel range (II.F.2)
9. Safety-Relief Valve position indication (II.D.3)

The suppression chamber hydrogen concentration analyzer and monitor are listed as an enhancement made by Mod 5274 (see 3.7.A Bases for a discussion of the CAD hydrogen and oxygen analyzers).

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Unit 3 PBAPS 3.2 BASES (Cont'd)

Four sets of two radiation monitors are provided which initiate the Reactor Building Isolation function and operation of the standby gas treatment system. Four instrument channels monitor

, the radiation from the refueling area ventilation exhaust ducts and i four instrument channels monitor the building ventilation below the refueling floor. Each set of instrument channels is arranged in a 1 out of 2 twice trip logic.

Trip settings of less than 16 mr/hr for the monitors in the refueling area ventilation exhaust ducts are based upon ini-

tiating normal ventilation isolation and standby gas treatment
system operation so that none of the activity released during the l refueling accident leaves the Reactor Building via the normal j ventilation path but rather all the activity is processed by the
standby gas treatment system.

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! Two channels of nonsafety-related radiation monitors are

< provided in the main stack. Trip signals from these monitors are

required only when purging the containment through the SGTS and containment integrity is required. The trip signals isolate pri-mary containment vent and purge valves greater than 2 inches in diameter to prevent accidental releases of radioactivity offsite j when the valves are open. This signal is added to fulfill the

{ requirements of item II.E.4.2(7) of NUREG-0737.

I Flow integrators are used to record the integrated flow of liquid from the drywell sumps. The integrated flow is indica-

tive of reactor coolant leakage. A Drywell Atmosphere Radioactivity

! Monitor is provided to give supporting information to that supplied by the reactor coolant leakage monitoring system. (See Bases for

, 3. 6. C and 4. 6. C) 1 1 Some of the surveillance instrumentation listed in Table 1 3.2.F are required to meet the accident monitoring requirements of i

NUREG-0737, Clarification of TMI Action Plan Requirements. This instrumentation and the applicable NUREG-0737 requirements are:

1. Wide range drywell pressure (II.F.1.4)
2. Subatmospheric drywell pressure (II.F.1.4)
3. Wide range suppression chamber water level (II.F.1.5)
4. Main stack high range radiation monitor (II.F.1.1)
5. Reactor building roof vent high range radiation monitor (II . F .1.1)
6. Drywell hydrogen concentration analyzer and monitor
(II.F.1.6)
7. Drywell high range radiation monitors (II.F.1.3)
8. Reactor Water Level - wide and fuel range (II.F.2)
9. Safety-Relief Valve position indication (II.D.3)

The suppression chamber hydrogen concentration analyzer i and monitor are listed as an enhancement made by Mod 5274 (see 3.7.A Bases for a discussion of the CAD hydrogen and oxygen analyzers).

Unit 2

. PBAPS LfMITINGCONDITIONSFOROPERATION SURVEILLANCE REQUIREMENTS 3.7.A Primary Containment 4.7.A Primary Containment

6. Containment Atmosohere Dilution
6. Containment Atmosohere

, a. Whenever either reactor is in Dilution l power operation, the Post-LOCA Containment Atmosphere Dilution a. The post-LOCA containment System must be operable and atmosphere dilution capable of supplying nitrogen system shall be to either Unit 2 or Unit 3 functionally tested once containment for atmosphere per operating cycle.

dilution if required by post-LOCA conditions. If this specification cannot be met, b. The level in the liquid the system must be restored to nitrogen storage tank an operable condition within 30 shall be verified in days or both reactors must be accordance with taken out of power operation. Specification 4.7.E.3.a.

b. Whenever either reactor is in power operation, the post-LOCA Containment Atmosphere Dilution System shall contain a minimum of 2500 gallons of liquid nitrogen. If this specification cannot be met, the minimum volume will be restored within 30 days or both reactors must be taken out of power operation.
c. Whenever the reactor is in power operation, there shall be 2 analyzers operable to monitor oxygen concentration in the containment atmosphere. There shall be 2 channels operable to monitor drywell oxygen concentration and 2 channels operable to monitor torus oxygen concentration.

With only 1 channel operable to monitor drywell oxygen concentration or with only 1 channel operable to monitor torus oxygen concentration, restore the inoperable channel (s) to operable status within 7 days 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 />.

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I. Unit 2 PBAPS LIMITING CONDITIONS FOR OPERATION SURVElllANCE RE0VIREMENTS 3.7.A.6.c (Cont'd) 4.7.A.6 (Cont'd)

With no channels c. The analyzers shall be operable to monitor tested for channel check drywell oxygen once per month and shall concentration or no have channel calibration channels operable to using bottled gas once monitor torus oxygen per 3 months. The concentration, restore atmospheric analyzing  ;

the inoperable system shall be 1 channel (s) to operable functionally tested once status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> per operating cycle in or be in at least Hot conjunction with the Shutdown within the next specification 4.7 A.6.a.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />,

d. Technical Specification requirements for hydrogen are detailed separately in Table 3.2.F/4.2.F.

l e. A 30 psig limit is the maximum containment repressurization allowable using the CAD system. Venting via the SBGT system to this stack must be initiated at 30 psig following the initial peak pressure at 49.1 psig.

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l Unit 3 PBAPS

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3.7.A & 4.7.A BASES (Cont'd) periodic testing of the system is required. Twice weekly operation of the containment oxygen analyzer that is associated with the containment inerting makeup system is sufficient to insure its readiness. Reliance on that oxygen analyzer for this purpose of post-LOCA oxygen measurement will terminate when the CAD system is operable.

The Post-LOCA Containment Atmosphere Dilution system design basis and description are presented in Question 14.6 of the FSAR. In summary, the limiting criteria, based on the assumptions of Safety Guide 7, are:

1. Maintain orygen concentration in the containment during post-LOCA conditions to less than 5% Volume.
2. Limit the buildup in the containment pressure due to nitrogen addition to less than 30 psig.
3. To limit the offsite dose due to containment venting (for pressure control) to less than 30 Rem to the thyroid.

By maintaining at least a 7-day supply of nitrogen on site, there will be sufficient time after the occurrence of a LOCA for obtaining additional nitrogen supply from local commercial sources which have been discussed in Question 14.6 of the FSAR. The system design contains sufficient redundancy to ensure its reliability. Thus, it is sufficient to test the operabili'y of the whole system once per operating cycle.

Drywell and suppressi a chamber hydrogen and oxygen analyzers are provided to detect high hydrogen or oxygen concentration conditions. The drywell and suppression chamber hydrogen and oxygen analyzer instrumentation consists of two independent gas analyzers. Each gas analyzer can determine hydrogen and oxygen concentration. The analyzers are capable of determining hydrogen concentration in the range of 0 to 30% by volume and oxygen concentration in the range of 0 to 10% by volume. Each gas analyzer must be capable of sampling either the drywell or the suppression chamber. The hydrogen and oxygen concentration from each analyzer are displayed on its associated control room recorder. Each analyzer is also provided with two sample pumps.

Only one pump is required for analyzer operation. The CAD analyzers are not normally in service. They are manually placed in service from the control room following a LOCA. The Technical Specification requirements for hydrogen are detal, led separately in Tables 3.2.F/4.2.F.

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