ML20154C827

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Proposed Tech Specs SR 3.6.4.1.2,revising Wording to Maintain Requirement That Secondary Containment Is Not Breached at Any Time When Secondary Containment Is Required
ML20154C827
Person / Time
Site: Peach Bottom  Constellation icon.png
Issue date: 09/29/1998
From:
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20154C825 List:
References
NUDOCS 9810070035
Download: ML20154C827 (7)
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ATTACHMENT 4

. PEACH BOTTOM ATOMIC POWER STATION l UNITS 2 AND 3

!' Docket Nos. 50-277 j 50-278 i.

License Nos. DPR-44 DPR-56

. REVISED TECHNICAL SPECIFICATIONS CHANGES List of Attached Revised Pages

! Units 2 and 3 TS Page 3.6-35 i BASES Page 3.6-76 BASES Page 3.6-77 1:

i 9810070035 900929 PDR ADOCK 05000277 P PDR

Secondary Containment 3.6.4.1 l ACTIONS 5

CONDITION REQUIRED ACTION COMPLETION TIME C. (continued) C.2 Suspend CORE Immediately ALTERATIONS. -

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I C.3 Initiate action to Immadiately suspend OPDRVs.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY l l

SR 3.6.4.1.1 _ Verify all- secondary containment 31 days equipment hatches are closed and sealed.

SR 3.6.4.1.2 Verify one secondary containment access 31 days door in each access opening is closed.

SR 3.6.4.1.3 Verify each standby _ gas treatment (SGT) 24 months on a subsystem will draw down the secondary STAGGERED TEST containment to a 0.25 inch of vacuum BASIS water gauge in s 120 seconds.

SR 3.6.4.1.4 Verify each SGT subsystem can maintain 24 months on a 2 0.25 inch of vacuum water gauge in the STAGGERED TEST secondary containment for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at a BASIS flow rate s 10,500 cfm.

PBAPS UNIT 2 3.6-35 Amendment No.

1 Secondary Containment B 3.6.4.1 i

, BASES (continued)

-SURVEILLANCE SR 3.6.4.1.1 and SR 3.6.4.1.2 REQUIREMENTS Verifying that secondary containment equipment hatches and I one access door in each access opening are closed ensures that the infiltration of outside air of such a magnitude as to prevent maintaining the desired negative pressure does i not occur. Verifying that all such openings are closed provides adequate assurance that exfiltration from the secondary containment will not occur. In this application,  :

the term " sealed" has no connotation of leak tightness.

Maintaining secondary containment OPERABILITY requires i verifying one door in the acr.ess opening is closed. An '

access opening contains one inner and one outer door. In some cases, secondary containment access openings are shared  !

such that a secondary containment barrier may have multiplo inner or multiple outer doors. The intent is to not breach secondary containment at any time when secondary containment is required. This is achieved by maintaining the inner or outer portion of the barrier closed at all times. However, all secondary containment access doors are normally kept closed, except when the access opening is being used for entry and exit or when maintenance is being performed on an access opening. The 31 day Frequency for these SRs has been shown to be adequate, based on operating axperience, and is considered adequate in view of the other indications of door and hatch status that are available to the operator.

SR 3.6.4.1.3 and SR 3.6.4.1.4 i

The SGT System exhausts the secondary containment atmosphere to the environment through appropriate treatment equipment.

To ensure that fission products are treated, SR 3.6.4.1.3 verifies that the SGT System will rapidly. establish and '

maintain a pressure in the secondary containment that is less than the pressure external to the secondary containment boundary. This is confirmed by demonstrating that one SGT subsystem will draw down the secondary containment to a 0.25 inches of vacuum water gauge in s 120 seconds. This cannot be accomplished if the secondary containment boundary is not. intact.

SR 3.6.4.1.4 demonstrates that one SGT subsystem can maintain 2 0.25 inches of vacuum water gauge for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at a flow rate s 10,500 cfm. The 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> test period allows secondary containment to be in thermal equilibrium at steady (continued)

PBAPS UNIT 2 B 3.6-76 Revision No.

Secondary' Containment j .

B 3.6.4.1 BASES SURVEILLANCE SR 3.6.4.1.3 and SR 3.6.4.1.4 (continued)

REQUIREMENTS state conditions. Therefore, these two tests are used to ensure secondary containment boundary integrity. Since.

' these SRs are secondary containment tests' they need not be j

performed with each SGT subsystem. The.SGT, subsystems are l tested on a STAGGERED TEST BASIS, however, to ensure that in 1 addition to the requirements of LC0 3.6.4.3, either SGT  ;

subsystem will perform this test. Operating experience has j shown these components will usually pass the Surveillance

' when performed at the 24 month Frequency. Therefore, the l

' Frequency was concluded to be acceptable from a reliability l standpoint.

. REFERENCES 1. UFSAR, Section 14.6.3.

1 l 2. UFSAR, Section 14.6.4.

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PBAPS UNIT 2 B 3.6-77 Revision No.

Secondary Containment 3.6.4.1 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME C. (continued) C.2 Suspend CORE Immediately ALTERATIONS. ..

8.HD -

C.3 Initiate action to Immediately suspend OPDRVs.

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1 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.6.4.1.1 Verify all secondary containment 31 days equipment hatches are closed and sealed.

SR 3.6.4.1.2 Verify one secondary containment access 31 days door in each access opening is closed.

SR 3.6.4.1.3 Verify each standby gas treatment (SGT) 24 months on a subsystem will draw down the secondary STAGGERED TEST containment to a 0.25 inch of vacuum BASIS water gauge in s 120 seconds.

SR 3.6.4.1.4 Verify each SGT subsystem can maintain 24 months on a a 0.25 inch of vacuum water gauge in the STAGGERED TEST secondary containment for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at a BASIS flow rate s 10,500 cfm.

PBAPS UNIT 3 3.6-35 Amendment No.

~__. _ _ _ _.. _ _ _ _ __._. _ _ _ _ _ _ _ _ ___ __

, Secondary Containment B 3.6.4.1 5

, BASES (continued) i SURVEILLANCE SR 3.6.4.1.1 and SR 3.6.4.1.2 REQUIREMENTS Verifying that secondary containment equipment hatches and l one access door in each access opening are closed ensures that the infiltration of outside air of su'ch a magnitude as

to prevent maintairdng the desired negative pressure does
not occur. . Verifying that all such openings are closed
' provides adequate assurance that exfiltration from the i

secondary containment will not occur. In this application, the term " sealed"_ has no connotation of leak tightness.

Maintaining secondary containment OPERABILITY requires

! verifying one door in the access opening is closed. An i

access opening contains one inner and one outer door. In some cases, secondary containment access openings are shared such that a secondary containment barrier may have multiple F inner or multiple outer doors. The intent is to not breach secondary containment at any time when secondary containment i is required. This is achieved by maintaining the inner or i

i outer portion of the barrier closed at all times. However, all secondary containment access doors are normally kept

closed, except when the access opening is being used for j entry and exit or when maintenance is being performed on an l l access opening. The 31 day Frequency for these SRs has been l 4

shown to be adequate, based on operating experience, and is considered adequate in view of the other indications of door and hatch status that are available to the operator.

SR 3.6.4.1.3 and SR 3.6.4.1.4 The SGT System exhausts the secondary containment atmosphere  !

to the environment through appropriate treatment equipment.  !

l To_ ensure that fission products are treated, SR 3.6.4.1.3 verifies that the SGT System will rapidly establish and {

i maintain a pressure in the secondary containment that is less than the pressure external to the secondary containment boundary. This is confirmed by demonstrating that one SGT subsystem will draw down the secondary containment to a 0.25 inches of vacuum water gauge in s 120 seconds. _This cannot be accomplished if the secondary containment boundary is not intact.

SR 3.6.4.1.4 demonstrates that one SGT subsystem can j maintain 2 0.25 inches of vacuum water gauge for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at a 1 flow rate s 10,500 cfm. The 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> test period allows j secondary containment to be in thermal equilibrium at steady j (continued)

PBAPS UNIT 3 8 3.6-76 Revision No.

]

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Sscondary Containment B 3.6.4.1 i

i , BASES 2

, SURVEILLANCE SR 3.6.4.1.3 and SR 3.6.4.1.4 (continued)

REQUIREMENTS state conditions. Therefore, these two tests are used to ensure secondary containment boundary integrity. Since-these SRs are secondary containment tests, they need not be performed with each SGT subsystem. The SGT, subsystems are tested on a STAGGERED TEST BASIS, however, to ensure that in 4

addition to the t eauirements of LCO 3.6.4.3, either SGT subsystem will perform this test. Operating experience has

~ sh /--a these components will usually pass the Surveillance when performed at the 24 month Frequency. Therefore, the ,

Frequency was concluded to be acceptable from a reliability

standpoint.

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1' REFERENCES 1. UFSAR, Section 14.6.3.

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j 2. UFSAR, Section 14.6.4.

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i FBAPS UNIT 3 8 3.6-77 Revision No. I

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