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Proposed Tech Specs Re Containment Purge & Vent Limitations
	ML20210C664
Person / Time
Site:	Peach Bottom
Issue date:	09/15/1986
From:	; PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	;
Shared Package
ML20210C617	List: ML20210C611; ML20210C636; ML20210C664;
References
	NUDOCS 8609180394
	Download: ML20210C664 (6)
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LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.7.B. Standby Gas Treatment System 4.7.B.

Standby Gas Treatment System 1.

Except as specified in 1.

At least once per operating 3.7.B.3 below, both filter cycle, the following condi-trains of the Standby Gas tions shall be demonstrated.

Treatment System and at least two system fans

a. Pressure drop across shall be operable at all the combined HEPA filters times when secondary and charcoal absorber j

containment integrity banks is less than 8 is required.

Only one of inches of water at the two Standby Gas Treat-approximately 8,000 CFM.

ment System (SGTS) trains shall be used at a time b.

Inlet heater is for primary containment capable of providing purge / vent operations at least 40 KW.

using the large isolation valves.

Both SGTS trains 2.a. The test and sample analysis shall be operable as required of Specification 3.7.B.2 by Specification 3.7.E.

Shall be performed initially and at least once per year 2.a. The results of the in-for standby service; or place cold DOP and after every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of halogenated hydrocarbon filter train operation; or tests at approximately 8000 following significant CFM on HEPA filters and painting, fire or chemical charcoal adsorber banks release in any ventilation shall show >/= 99% DOP one communicating with the removal and >/= 99%

system when it is in operation.

halogenated hydrocarbon removal or that filter

b. Cold DOP testinq shall be i

train shall not be performed after each complete considered operable.

or partial replacement of the HEPA filter bank or after any

b. The results of Laboratory structural maintenance on the carbon sample analysis shall system housing.

show >/= 95% radioactive methyl iodJde removal at velocity

c. Halogenated hydrocarbon refrig-within 20% of system design, erant testing shall be performed j

0.5 to 1.5 mg/m3 inlet methyl after each complete or partial l

lodide concentration, >/=70%

replacement of the charcoal relative humidity and >/=190 adsorber bank or after any degrees P or that filter utructural maintenance of the train shall be considered system housing.

inoperable.

d. Testing of gasket seals for

c. If gas flow capability of housing doors downstream of 8,000 CFM +/-800 CFM can the HEPA filters and charcoal not be provided to a filter adsorbers shall be performed train by the fans, that at and in conformance with each filter train shall not be test performed for compliance considered operable.

with Specification 4.7.B.2.a.

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4 PBAPS LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.7.D Primary Containment 4.7.D Primary Containment Isolation Valves Isolation Valves

1. During reactor power oper-

1. The primary containment ating conditions, all isola-isolation valve surveillance tion valves listed in Table shall be performed as 3.7.1 and all reactor instrument follows:

line excess flow check valves shall be operable except as

a. At least once per specified in 3.7.D.2 and operating cycle the operable 3.7.D.3 below, isolation valves that are power operated and automatically 2.

In the event any isolation initiated shall be tested valve specified in Table for simulated automatic 3.7.1 becomes inoperable for initiation and closure isolation, maintain at least times.

one isolation valve operable in the affected penetration

b. At least once per quarter:

that is open and within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months either:

(1) All normally open power operated isolation

a. Restore the inoperable valve valves (except for the to operable status, or main steam line power-operated isolation

b. Isolate the affected penetra-valves) shall be fully tion by use of at least closed and reopened, one deactivated automatic valve secured in the isolation (2) With the reactor power position *, or less than 75% trip main steam isolation valves

c. Isolate the affected penetra-individually and verify tion by use of at least closure time, one closed manual valve

or blind flange.

c. At least once per week the main steam line power-

d. Otherwise be in at least Hot operated isolation valves Shutdown within the next shall be exercised by 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in Cold partial closure and Shutdown within the subsequent reopening.

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following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

g l2.a.Wheneveranisolationvalve j

listed in Table 3.7.1 is inoperable, the position of at least one other valve in each line having an inoperable valve shall be be recorded daily.

b. The isolation valves specified in Table 3.7.1 shall be denonstrated to be operable i

prior to returning to

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Isolation valves closed to service after maintenance on i

satisfy these requirements may or replacement of the valve, j

be reopened on an intermittent actuator, control or power basis under administrative circuit by performance of a control.

cycling test, and verifica-i tion of isolation time.

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s LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS

3. If any reactor instrumentation

3. At least once per operating line excess flow check cycle the operability of valve is inoperable, within the reactor coolant system

'4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months either:

instrument line ficw check valves shall be verified.

a.

Restore the inoperable excess flow check valve to operable status or, b.

Isolate the instrument line and declare the associated instrument inoperable.

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c. Otherwise be in at least llot Shutdown within the i

next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in Cold I

Shutdown within the j

following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

3.7.E Large Primary Containment 4.7.E Large Primary Containment i

Purge / Vent Isolation Vafves Purge / Vent Isolation Valves

1. The large primary containment

1. The inflatable seals for purge / vent isolation valves the large containmer.t venti-(6 and 18 inches) shall be lation isolation valves operated in accordance with shall be replhced at specification 3.7.D and with least once every third specifications 3,7.E.2 and refueling outage.

3.7.E.3 below.

2. The LLRT leak rate for

2. When the reactor pressure is the large containment greater than 100 psig, and ventilation isolation t

the reactor critical, valves shall be compared to the and the reactor mode previously measured leak switch in the "Startup" or rate to detect excessive "Run" mode, primary contain-valve degradation.

ment purging or venting shcIl be subject to the following restrictions:

a. The large primary containment 9

purge / vent isolation valves i

may be opened only for inerting, de-inerting, and pressure contret.

b. The accumulated time a purge or vent flow path exists shall be limited to 90 hours0.00104 days 0.025 hours 1.488095e-4 weeks 3.4245e-5 months per calendar year.

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PBAPS LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS

c. The flow paths subject to tnis specification are listed below:

Penetration Flow Path Valves N25 AO.2505 - AO-2520 AO-2519 - AO-2520 N26 AO-2506 - AO-2507 N205B AO-2521A - AO-2521B AO-2519 - AO-2521B 1

N219 AO-2511 - AO-2512 P

d. Only one of two Standby Gaa Treatment Systems (SGTS) trains shall be used for purging or venting at any time.

e. Both SGTS trains shall be operable.

3.

If the provisions of specification 3.7.E.2 cannot be satisfied, isolate the penetration within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months or be in at least Hot Shutdown within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in Cold Shutdown within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

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Gnit 3 PBAPS LIMITING CONDITIONS FOR OPERATICN SURVEILLANCE RECUIREMENTS

c. The flow paths subject to thic noecification are i

listed oelow:

Penet_r,ation Plow Path Valveq N25 AO 3505 - AO-3520 AO-3519 - AO-3520 N26 AO-3506 - AO-3507 N205B AO-352]A - AO-3521B AO-3519 - AO-3521B N219 AO-3511 - AO-3512

d. Only one of two Standby Gas Treatment System (SGTS) trains shall be used for purging or venting at any time.

e. Both SGTS trains shall be operable.

3. If the provisions of specification 3.7.E.2 cannot be satisfied, isolate the penetration within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months or be in at least I

Hot Shutdown within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in Cold Shutdown within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

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Large Primary Containment Purge / Vent Isolation Valves The large containment purge / vent isolation valves are subject to the restrictions of Specification 3.7.E.2 to limit the total time that a flow path exists through certain containment penetrations.

Consequently, the impact on plant risks reculting from a LOCA while purging and the potential for failure of the Standby Gas Treatment System contribute little to the likelihood of an uncontrolled radioactive release.

Additionally, containment purging is permitted only for inerting, de-inerting, and pressure control of the containment environment.

Included within the scope of de-inerting is the need to purge containment to ensure personnel safety during the performance of inspections beneficial to nuclear safety; e.g.,

inspection of primary coolant integrity during plant startups and shutdowns.

Adjustments in primary containment pressure to perform tests such as the drywell-to-torus bypass leakage test are included within the scope of pressure control purging.

Purging for humidity and temperature control using the large valves is excluded by the specification.

The T-ring inflatable seal in the valves assures very low rates of leakage.

Following valve closure, the seal ghamber is automatically pressurized, establishing a tight seal against the periphery of the closed butterfly disc.

The seal is subject to some compression set over a period of time due to radiation and temperature effects.

This phenomena will not be a problem for the Peach Bottom valves because the inflatable T-ring seal' maintains a constant and uniform sealing compression.

However, as a preventive maintenance measure, the seals will be replaced every third refueling outage, which approximates the manufacturer's recommendations of every four years.

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ML20210C664

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