ML18139B982

Proposed Tech Spec Changes Re Auxiliary Bldg Ventilation Sys & Control Room Air Filtration Sys

ML18139B982
Person / Time
Site:	Surry
Issue date:	07/29/1982
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18139B981	List: ML18139B980 ML18139B982
References
NUDOCS 8208030448
Download: ML18139B982 (20)

Text

Section Title Page 3.15 Containment Vacuum System TS 3.15-1 3.16 Emergency Power System TS 3.16-1 3.17 Loop Stop Valve Operation TS 3.17-1 3.18 Movable Incore Instrumentation TS 3.18-1 3.19 Main Control Room Bottled Air System TS 3.19-1 3.20 Shock Suppressors (Snubbe~s) TS 3.20-1 3.21 Fire Detection and Suppression System TS 3.21-1 3.22 Auxiliary Ventilation E.xhaust Filter Trains TS 3.22-1 3.23 Control Room Ventilation Supply Filter Trains TS 3.23-1 4.0 SURVEILLANCE REQUIREMENTS TS 4.0-1 4.1 Operational Safety Review TS 4.1-1 4.2 Reactor Coolant System Component Tests TS 4.2-1 4.3 Reactor Coolant System Integrity Testing Following Opening TS 4.3-1

4. 4. Containment Tests TS 4.4-1 4.5 Spray Systems Tests TS 4.5-1 4.6 Emergency Power System Periodic Testing TS 4.6-1 4.7 Auxiliary Feedwater System TS 4.8-1 4.9 Effluent Sampling and Radiation Monitoring System TS 4.9-1 4.10 Reactivity Anomalies TS 4.10-1 4.11 Safety Injection System Tests TS 4.11-1 4.12 Auxiliary Ventilation Exhaust Filter Trains TS 4.12-1 4.13 Nonradiological Environmental Monitoring Program TS 4.13-1 4.14 Temperature Limitations on Condenser Cooling Water Discharge TS 4.14-1 4.15 Augmented Inservice Inspection Program for High Energy Lines Outside of Containment TS 4.15-1 4.16 Leakage Testing of Miscellaneous Radioactive Materials TS 4.16-1 4.17 Shock Suppressors (Snubbers) TS 4.17-1 4.18 Fire Detection and Protection System Surveillance TS 4.18-1 4.19 Steam Generator Inservice Inspection TS 4.19-1 4.20 Control Room Air Filtration System TS 4.20-1

~~820729 PDR ADDCK 05000280 P PDR

12.

• TS 3.10-4 A spent fuel cask or heavy loads exceeding 110 percent of the weight of a fuel assembly (not including fuel handling tool) shall not be moved over spent fuel, and only*one spent fuel assembly will be handled at one time over the reactor or the spent fuel pit.

13. A spent fuel cask shall not be moved into the Fuel Building unless the Cask Impact Pads are in place on the bottom of the spent fuel pool.

14. Two trains of the control ~~y r o o m ~ ~ ~ ventilation~fJ;rL./

system shall be operable. With one train inoperable for any reason, demonstrate the other train is operable by performing the test in Specification 4.20.A.l. With both trains inoperable comply with Specification 3.10.B.

B. If any one of the specified limiting conditions for refueling is not met, refueling of the reactor shall cease, work shall be initiated to correct the conditions so that the specified limit is met, and no operations which increase the reactivity of the core shall be made~

C. After initial fuel loading and after each core refueling operation and prior to reactor operation at greater than 75% of rated power, the movable incore detector system shall be utilized to verify proper power distribution.

D. The requirements of 3.0.1 are not applicable.

Basis

- TS 3.10-5 Detailed instructions, the above specified precautions and the design of the fuel handling equipment, which incorporates built-in interlocks and safety features, provide assurance that an accident, which would result in a hazard to public health and safety, will not occur during refueling operations.

When no change is being made in core geometry, one neutron detector is sufficient to monitor the core and permits maintenance of the out-of-function instrumentation. Continuous monitoring of radiation levels and neutron flux provides immediate indication of an unsafe condition. Containment high radiation levels and high airborne activity levels automatically stop and isolate the Containment Purge System. The fuel building ventilation exhaust is diverted through charcoal filters whenever refueling is in progress. At least one flow path is required for cooling and mixing the coolant contained in the reactor vessel so as to maintain a uniform boron concentration and to remove residual heat.

The shutdown margin established by Specification A-9 maintains the core subcritical, even with all of the control rod assemblies withdrawn from the core.

During refueling, the reactor refueling water cavity is ~illed with approximat~li 220,000 gal of water borated to at least 2,000 ppm boron. The boron concentra-tion of this water is sufficient to maintain the reactor subcritical by approxi-mately 10% Wk/kin the cold shutdown condition with all control rod assemblies inserted and also to maintain the core subcritical by approximately 1% with no control rod assemblies inserted into the reactor. Periodic checks of refueling water boron concentration assure the proper shutdown margin. Specification A-10 allows the Control Room Operator to inform the manipulator operator of any impending unsafe condition detected from the main control board indicators during fuel movement.

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3.19-1

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3.19 MAIN CONTROL ROOM BOTTLED AIR SYSTEM

_Applicability Applies to the ability to maintain a positive differential pressure in the main control room.

Objective To specify functional requirements for the main control room bottled air system.

Specification A. Requi_rements A bottled dry air .bank shall be available to pressurize the main control room to a positive differential pressure with respect to adjoining areas of the auxiliary, turbine, and service buildings for one hour. A minimum positive differential pressure of 0.05 inches of Yater must be maintained when the control room is isolated under accident conditions. This capability shall be demonstrated by the testing requirement delineated in Technical Specification 4.1.

B. Remedial Action If the requirements of Section A are not met, the unit shall be placed in

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the hot shutdown condition within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />; except that if tests during the 8-hour period demonstrate that the emergency control room ventilation system is functional, the unit shall be brought within the requirements of Section A or placed in the hot shutdown condition within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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3.22 AUXILIARY VENTILATION EXHAUST FILTER TRAINS Applicability Applies to the ability of the safety-related system to remove particulate matter and gaseous iodine following a LOCA or a refueling accident.

Objective

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To specify requirements to ensure the proper function of the system.

Specification

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'i . A. :-Wh-e~htl_un.i-tl.S=Re-a&teT-Borrra'tft-syst~m-temp*era*t:tt-r-e-a'Ild-p-i:,e,s-su-i:.e is--gr-ea-ter-than~J,5Q.'!.F-a-nd~G*~p-s-i-g,p..s,I:.e~e.;i,,.., ~ o auxilia_ry

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ventilation exhaust filter trains. shall.be operableAwith:

1. Two filter exhaust fans

'fi,'o HEPA filter and charcoal adsorber assemblies.

With one train of the exhaust filter system inoperable for any reason

1. Return the inoperable train to a operable status within 7 days 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 in Cold Shutdown within the following 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

2. 'when one train of the exhaust filter becomes inoperable the operability of the other train shall be demonstrated immediately~

.a~t~ The operability of the other train shall be demonstrated by performing Step A.I of Technical Specification 4.12.

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Basis The purpose of the filter trains located in the auxiliary building .is to provide stanqby capability for removai*of particulate and iodine contaminants from the exhaust air of the charging pump cubicles of the auxiliary building, fuel building, decontamination building, safeguards building *adjacent to the containments, and the reactor containment *(during shutdown) which discharge through the ventilation vent and could require filtering prior to release.

During normal plant operation, the exhaust from any one of these areas can be diverted, if required, through the auxiliary building filter trains remote-ly from the control room. The safeguards building exhaust and the charging pump cubicle exhaust are automatically diverted through the filter trains in the event of a LOCA (diverted on safety injection system signal). The fuel buildin 5 exhaust and purge exhaust are aligned to continuously pass through

• the filters during spent fuel handling.

High efficiency particulate absolute (HEI'A) filters are installed before the charcoal adsorbers to prevent clogging of the iodine adsorbers. The charcoal adsorbers are installed to reduce the potential release of radioiodine to the environment.

..

3.23 CONTROL~ .

- '

ROOM VENTILATION SUPPLY FILTER TRAINS TS 3.23-1 APPLICABILITY Applies to the control ane !:clay- room- emergency ame.J:.g.Gffi~)c._Ventilation system.

OBJECTIVE To specify requirements to ensure the proper function of the control aftd...~-r-e-1-a-y. .

room emergency ventilation system.

SPECIFICATION A. Both trains of the control a'!.'11k-~y room emergency ventilation system shall be operable whfmever either unit is above cold shutdown.

B. With one train of the control and relay room emergency ventilation system inoperable for any reason, return the inoperable train to a operable status within 7 days 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 in Cold Shutdown within the following 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

BASIS When the s_upply of compressed bottled air is depleted, the control room~~

~ room emergency ventilation system is manually started to continue to maintain the control room pressure at the design positive pressure so that all leakage is outleakage. One train of the control room emergency ventilation consists of one fan powered from an independent emergency power source.

The c o n t r o l ~ room emergency ventilation system is designed to filter the intake air to the control room pressure envelope, which consists of the control room, relay rooms, and emergency switchgear rooms during a LOCA.

...

- e TS 3.23-2 High efficiency particulate air (HEPA) filters are installed before the charcoal adsorbers to prevent clogging of the iodine adsorbers. The charcoal adsorbers are installed to reduce the potential intake of radioiodine to the control room. The in-place test results should indicate a system leaktightness of less than l percent bypass leakage for the charcoal adsorbers and a HEPA efficiency of at least 99.5 percent removal of DOP particulates. The laboratory carbon sample test results should indicate a radioactive methyl iodide removal efficiency of at least 95 percent for expected accident conditions. The control room dose calculations assume only 90 percent iodine removal efficiency for the air passing through the charcoal filters.

Therefore, if the efficiencies of the HEPA filters and charcoal adsorbers are as specified, at the temperatures, flow rates and velocities within the design values of the system, the resulting doses will be less than the allowable levels stated in Criterion 19 of the General Design Criteria for Nuclear Power Plants, Appendix A to 10 CFR Part 50.

If the system is found to be inoperable, there is no immediate threat to the control room, and reactor operation may continue for a limited period of time while repairs are being made. If the.system cannot be repaired within the specified time, procedures are initiated to establish conditions for which the filter system is not required.

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.-:., 4. 12 AUXILIARY VENTILATION EXHAUST l<'ILTER TRAINS

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. -. Applicability Applies to the testing of safety-related air filtration systems.

Objective T.o verify that leakage efficiency and iodine removal efficiency are within a.ccep tab le limits.

Specifications A. Tests and Frequency

1. Each redundant filter train circuit shall be operated every month if it bas not already been in operation.

2. At least once per refueling cycle, the operability of the entire safety-related portion*of the auxiliary ventilation system shall be demonstrated.

3. Auxiliary ventilation system exhaust fan flow rate through each

---~*., filter train in the LOCA mode of operation shall be determined initially, after any structural maintenance on the HEPA filter or charcoal adsorber housings, once per refueling cycle, i. e.

approximately 18 months, or after partial or complete replacement of the HEPA filters or charcoal adsorbers.

The procedure for determining the air flow rate shall be in accordance with Section 9 of the ACGIH Industrial Ventilation document and Section 8 of ANSI NSl0-1975.

4. A visual inspection of the filter train and associated components shall be conducted before each in-place air flow distribution test, DOP test, or activated charcoal adsorber leak test i~ accordance with the intent of section 5 of ANSI NSl0-1975.

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.:.'; 5. An air dis~ribution test across the prefilter bank shall be

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The air distribution test shall be performed with an anemometer located at the upstream side and at the center of each prefilter

• cell.

, /'6. In-place cold DOP tests for HEPA filter banks shall be performed:

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a. Initially, ho At least once per refueling cycle, i.e., approximately every eighteen months,

c. Following painting, fire, or chemical release in any ventilation zone comrnunic_a.ting with the system,

d. After each complete or partial replacement of the HEPA filter

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e. After any structural maintenance on the filter housing.

The procedure for in-place cold DOP tests shall be in accordance

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~-- with ANSI N510-1975, Section 10.5 or 11.4. The flow rate during the in-place cold DOP tests shall be 36,000 CFM +/-10 percent. The flow rate shall be determined by recording the flow meter reading in the*

control room.

7,:' In-place halogenated hydrocarbon leakage tests for the charcoal adsorber bank shall be performed:

a. Initially,

b. At least once per ref_ueling cycle, i.e., approximately every eighteen months,

c. Following painting, fire, or chemical release in any ventilation zone communicating with the system,

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d. After each complete or partial replacement of charcoal adsorber

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e. After any structural maintenance on the filter housing.

The procedure for in-place halogenated hydrocarbon leakage tests shall be in accordance with ANSI-NSl0-1975, Section 12.5. The flow (J..

rate during the in-place 11ologenated hydrocarbon leakage tests shall /~

be 36,000 CFM +/-10 percent. The flow rate shall be determined by recording the flow meter reading in the control room.

v8. Laboratory analysis on in-place charcoal samples shall be performed:

a. Initially, whenever a new batch of charcoal is used to fill adsorbers trays,

b. At least once per refueling cycle, i.e., approximately every eighteen months,

c. After 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of system operation, and

d. Following painting, fire, or chemical release in any ventilation zone communicating with the system or after any structural maintenance on the HEPA filter or charcoal adsorber housings.

Tbe procedure for iodine removal efficiency tests shall follow ASTM D3803. The test conditions shall be in accordance with those listed in TS 4.12.B.7.

9. The.pressure drop across the HEPA filter and adsorber banks shall be checked:

a. Initially,

b. At least once per refueling cycle thereafter for systems maintained in a stanqby status and after 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of system operation, and

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c. After each complete or partial replacement of filters or

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adsorbers.

B. Acceptance Criteria

1. The minimum period of air flow* through the filters shall be 15 minutes per month.

2. The system operability test of Specification 4.12.A.2 shall demonstrate automatic start-up, shutdown and flow path alignment.

3. The air flow rate determined in Specifications 4.12.A.3 shall be:

a. 36,000 cfm+/- 10 percent with system in the LOCA mode of operation.

b. The ventilation system shall be adjusted until the above limit is met.

4. Air distribution test across the prefilter-bank shall show uniformity of air velocity within +/- 20 percrmt of average velocity. The ventilation system shall be adjusted until the limit is met.

VS. In-place cold DOP tests on HEPA filters shall show greater than or equal to 99.5 percent DOP removal. Leakage sources shall be identified, repaired, and retested. Any HEPA filters found defective shall be replacedo

-i. In-place halogenated hydrocarbon leak.age tests on charcoal adsorber banks shall show greater than or equal to 99 percent halogenated hyrodcarbon removal. Leakage sources shall be identified, repaired, and retested.

7. Laboratory analysis on in-place charcoal samples shall sh~w at least 96 percent methyl iodide removal at 0.125 sec. residence time, 3

1.75+/-0.25 mg Im inlet methyl iodide concentration, relative humidity 1(5;-J:: J..

equal to..8.G~percent, and air temperature equal to 30+/-0.5°C.

a. Laboratory analysis of charcoal adsorbers shall be available within 31 days of sampling.

b. If the test results are unacceptable, all the adsorbent in the affected filter shall be replaced with new adsorbent qualified in accordance with Table 5.1 of ANSI N509-1976 *.

8. The pressure drop across filter cells and adsorbers shall not exceed 7.0 inches W. G. If this condition cannot be met, new filter cells shall be installed.

Basis Ventilation system filter components are not subject to rapid deterioration, having lifetimes of many years, even under continuous flow conditions. The tests outlined above provide assurance of filter reliability and will ensure timely detection of conditions which could cause filter degradation.

A pressure drop across the combined HEPA filters and charcoal adsorbers of less than 7 inches of water at the system design flow rate will indicate that the filters and adsorbers are not clogged by excessive amounts of foreign matter.

Operation of the filtration system for a minimum of 15 minutes a month prevents moisture buildup in the filters and adsorbers.

The frequency of tests and sample analysis of the degradable components of the system, i.e., the HEPA filter and charcoal adsorbers, is based on actual hours of operation to ensure that they perform as evaluated. System flow rates and air distribution do not change unless the ventilation system is radically altered.

If painting, fire, or chemical release occurs such that the HEPA filter or charcoal adsorb er could become contaminated from the fumes, chemical, or foreign material, the same tests and sample analysis are performed as required for operational use.

The in~place test results should indicate a system le~k tightness of less than 1 percent bypass leakage for the charcoal adsorbers and a HEPA efficiency of at least 99.5 percent removal of DOP 'particulates. The heat release from operating ECCS equipment limits the relative humidity of the exhaust air to less than 80 percent even when outdoor air is assumed to

• be 100 percent relative humidity and all ECCS leakage evaporates into the exhaust air stream.

The laboratory carbon sample -tests are required to indicate a radioactive methyl iodide removal efficiency of at least 96 percent at a relative humidity

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equal to 8~ percent. The offsite dose calculations for LOCA and fuel handling accidents assume 90 percent and 70 percent, respectively, iodine removal efficiency for the air passing through the charcoal filters.

Therefore, the efficiencies of the HEPA filters and charcoal adsorbers are demonstrated to be as specified~ at ~~ow rates, temperat~res, velocities, and relative humidities which are less than the design values of the system, the resulting doses will be less than 10 CFR 100 guidelines for the accidents analyzed. The demonstration of bypass 1% and demonstration of 96 percent methyl iodide removal efficiency will assure the*required capability of the filters is met or exceeded.

e e TS 4.20-1 4.20 CONTROL ROOM AIR FILTRATION SYSTEM APPLICABILITY Applies to the testing of safety-related air filtration systems of the control room and relay room.

OBJECTIVE To verify that leakage efficiency and iodine removal efficiency are within acceptable limits.

SPECIFICATION A. Tests and Frequency

1. The control room air filtration system flow rate test shall be performed:

a. Initially,

b. At *1east once per refueling cycle, i.e., approximately every eighteen months,

c. Following painting, fire, or chemical release in any ventilation zone co=unicating with the system during system op~ration,

d. After e~ch complete or partial rep~acement of the HEPA filter or charcoal adsorbers and

e. After any structural maintenance the HEPA filter or charcoal adsorber housings.

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2. The procedure for determining the air flow rate shall be in accor-dance with Section 9 of the ACGIH Industrial Ventilation document

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and Section 8 of ANSI NSl0-1975. A visual inspection of the filter train and its associated components shall be conducted before each in-place airflow distribution test, DOP test, or activated charcoal adsorber leak test in accordance with the intent of Section 5 of ANSI NSl0-1975.

3. In-place cold DOP tests for HEPA filter banks shall be performed:

a. Initially,

b. At least once per refueling cycle, i.e., approximately every eighteen months, *

c. Following painting, fire, or chemical release in any ventilation zone communicating with the system during system operation,

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d. After each complete _or pa.rtial replacement of the HEPA filter cells, and

e. After any structural maintenance of the filter housing.

4. The procedure for in-place cold DOP tests shall be in accordance with ANSI NSl0-1975, Sect.ion 10.5 or 11.4. The flow rate during this test shall be that value determined under Section 4.20.A.l and shall be within the range specified in Section 4.20.B.1.

5. In-place halogenated hydrocarbon leakage tests for the charcoal adsorber bank shall be performed:

a. Initially,

b. At least once per refueling cycle, i.e., approximately every eighteen months,

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c. Following painting. fire, or chemical release in any ventilation zone communicating.with the system during system operation,

d. After each complete or partial replacement of charcoal adsorbers trays, and

e. After any structural maintenance on the filter housing.

6. The procedure for in-place halogenated hydrocarbon leak.age tests shall be in accordance with ANSI NSl0-1975 Section 12.5. The flow rate during this test shall be that value determined under Section 4.20.A.l and shall be within the range specified in Section 4.20.B.1.

7. Laboratory analysis on charcoal samples shall be performed:

a. Initially, whenever a new batch of charcoal is used to fill adsorber trays,

b. At least once per refueling cycle, i.e.; approximately every eighteen months,

c. After 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of system operation, and i

d. Following painting, fire, or chemical release in any ventilation zone communicating with the system during system operation.

8. The procedure for iodine removal efficiency tests shall follow ASTM D3803. The test conditions shall be in accordance with *those listed in TS 4.20.B.4.

9. The pressure drop across the HEPA filter and adsorber banks shall be checked:

a. Initially,

b. At least once per refueling cycle, i.e., approximately every eighteen months, and

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TS 4.20-4

c. .After each complete or partial replacement of filters or adsorbers

10. Each filter train circuit shall be operated every month. Filter Train Operation shall be initiated manually from the control room.

B. Acceptance Criteria

-.- 1. Fan flow tube test shall show a flow rate through any single filter

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"'.'( train of between 750 and 1100 cfm.

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..f 2. In-place cold DOP tests on HEPA filters shall show greater than or equal to 99.5 percent DOP removal. Leaking sources shall be identified, repaired and retested. Any HEPA filter found defective shall be replaced.

3. In-place halogenated hydrocarbon leakage tests on c':iarcoal adsorb er banks shall show greater.than or equal to 99 percent halogenated hydrocarbon removal. Leakage sources shall be identified, repaired anq retested.

4. Laboratory analysis on in-place charcoal samples shall show at least 1'.

96 percent methyl iodide removal, at 0.125 sec residence time, with 3

1.75+/-0.25 mg/m inlet methyl iodide concentration, relative humidity

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equal to 95+/-~percent, and air temperature equal to 30+/-0.5°C. -The laboratory analysis shall be available within 31 days of sampling.

If the test results are unacceptable, all adsorbent in the filter shall be replaced with new adsorbent qualified in accordance with Table 5.1 of ANSI N509-1976.

5. The pressure drop across filter cells and adsorbers shall not exceed 5.0 inches W. G at design flow rate. If this condition cannot be met, new filter cells shall be installed.

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TS 4.20-5

6. The minimum period of air flow through the filter shall be 15 minutes per month.

BASIS Ventilation system filter components are not subject to rapid deterioration, having lifetimes of many years. The tests outlined above provide assurance of filter reliability and will ensure timely detection of condfrions which could cause filter degradation.

A pressure drop across the combined HEPA filters and charcoal adsorbers of less than 5 inches of water will indicate that the filters and adsorbers are not clogged by excessive amounts of foreign matter. Operation of the filtration system for a minimum of 15 minutes a month prevents moisture buildup in the filters and adsorbers.

The frequency of tests and sample analysis are necessary to show that the HEPA filters and charcoal adsorbers can perform as evaluated.

If painting, _fire, or chemical release occurs such that the HEPA filter or charcoal adsorber could become contaminated from fumes, chemicals, or foreign material, the same tests and sample analysis are performed as required for operational use.