ML18153A539

Proposed Tech Specs Re Charcoal Filter Testing Clarification

ML18153A539
Person / Time
Site:	Surry
Issue date:	03/21/1996
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18153A538	List: ML18153A537 ML18153A539
References
NUDOCS 9603260043
Download: ML18153A539 (10)

Text

TS 4.12-2

5. An air distribution test across the prefilter bank shall be performed initially and after any major modification, major repair, or maintenance of the air cleaning system affecting the filter bank flow distribution. The air distribution test shall be performed with an anemometer located at the downstream side and at the center of each carbon filters.

6. 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 while it is in service;

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

e. After any structural maintenance on the filter housing that could affect operation of the system.

The procedure for in-place cold DOP tests shall be in accordance 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 +/- 1O 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 refueling cycle, i.e., approximately every eighteen months; Amendment Nos.

-- - 9603260043 960321 PDR ADOCK 05000280 p PDR

TS 4.12-3

c. Following painting, fire, or chemical release* in any ventilation zone communicating with the system while it is in service;

d. After each complete or partial replacement of charcoal adsorber trays; and

e. After any structural maintenance of the filter housing that could affect operation of the system.

The procedure for in-place halogenated hydrocarbon leakage tests shall be in accordance with ANSI N510-1975, Section 12.5. The flow rate during the in-place halogenated hydrocarbon leakage tests shall be 36,000 CFM +/-1 O percent. The flow rate shall be determined by recording the flow meter reading in the control room.

8. Laboratory analysis of each redundant charcoal bank shall be performed:

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

b. Following painting, fire, or chemical release in any ventilation zone communicating with the system while it is in service; and

c. After any structural maintenance on the HEPA filter or charcoal adsorber housings, that could affect operation of the system; and

d. At least once per refueling cycle, if not otherwise tested per conditions 8.a, 8.b, or 8.c within the last refueling cycle.

The testing shall be performed in accordance with ASTM D 3803-1979 (Method A), with a 0.125 second residence time, and the results of the laboratory analysis shall be available within 31 days. The acceptance criteria shall be as specified in Specification 4.12.B.7.

Amendment Nos.

e TS 4.12-4 If the test results are unacceptable, the affected bank shall be removed from service and the used charcoal replaced by new charcoal before the bank is returned to service.

9. For new charcoal, the manufacturer's process shall be qualified in accordance with ANSI N509-1976, Table 5.1, item 5.a, and U.S.D.O.E. Standard NE M16-1T dated 1981, with a 0.25 second residence time, to demonstrate a methyl iodide penetration of < 1%. Also, each batch of new charcoal shall be tested in accordance with ASTM D3803-1979 as described below to demonstrate:

a. A methyl iodide penetration of < 3% when tested for a residence time of

• 0.125 seconds in accordance with ASTM D3803-1979 (Method A).

b. An elemental iodine retention of > 99.5% when tested in accordance with ASTM D3803-1979 (Method E).

10. 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 standby 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

c. After each complete or partial replacement of filters or 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 Specifications 4.12.A.2 shall demonstrate automatic start-up, shutdown and flow path alignment.

Amendment Nos.

TS 4.12-5

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

a. 36,000 cfm +/-1 O 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 percent of average velocity. The ventilation system shall be adjusted until the limit is met.

5. In-place cold DOP test 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 replaced.

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

7. The laboratory analysis results for used charcoal, tested in accordance with 4.12.A.8, shall show a methyl iodide penetration of < 4%.

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.

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.

Amendment Nos.

TS 4.12-6 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 adsorber 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 leak 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 iodine removal efficiency of at least 96 percent at a relative humidity equal to 95 +/-2 percent. The offsite dose calculation for LOCA assumes 90%

efficiency for removal of elemental iodine passing through the charcoal filters. The offsite dose calculation for the fuel handling accident assumed 90% (elemental iodine) and 70% (methyl iodide) 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 flow rates, temperatures, 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 iodine removal efficiency will assure the required capability of the filters is met or exceeded.

Amendment Nos.

-~ 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 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;

d. After each complete or partial replacement of the HEPA filter or charcoal adsorbers; and

e. After any structural maintenance on the HEPA filter or charcoal adsorber housings that could affect operation of the system; and Amendment Nos.

-.~

TS 4.20-2

f. After any major modification or repair of the air cleaning system.

2. 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 N510-1975. 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 N510-1975.

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;

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

e. After any structural maintenance the filter housing that could affect operation of the system.

4. The procedure for in-place cold DOP tests shall be in accordance with ANSI N510-1975, Section 10.5 or 11.4. The flow rate during this test shall be that value determined under Specification 4.20.A.1 and shall be within the range specified in Specification 4.20.B.1.

Amendment Nos.

e TS 4.20-3

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;

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 adsorber trays; and

e. After any structural maintenance on the filter housing that could effect operation of the system.

6. The procedure for in-place halogenated hydrocarbon leakage tests shall be in accordance with ANSI N510-1975 Section 12.5. The flow rate during this test shall be that value determined under Specification 4. 20. A. 1 and shall be within the range specified in Specification 4.20.B.1.

7. Charcoal adsorber shall be replaced:

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

b. Following painting, fire, or chemical release in any ventilation zone communicating with the system while it is in service;

c. After any structural maintenance on the HEPA filter or charcoal adsorber housings that could effect operation of the system; and

d. At least once per refueling cycle, if not otherwise replaced per conditions 7.a, 7.b, or 7.c within the last refueling cycle.

Amendment Nos.

TS 4.20-4 Upon meeting any of these conditions, the charcoal bank shall be removed from service and the charcoal replaced with new charcoal.

8. For new charcoal, the manufacturer's process shall be qualified in accordance with ANSI N509-1976, Table 5.1, item 5.a, and U.S.D.O.E Standard NE M16-1T dated 1981, with a 0.25 second residence time, to demonstrate a Methyl Iodide Penetration of < 1%. Also, each batch of new charcoal shall be tested in accordance with ASTM D3803-1979 as described below to demonstrate:

a. A Methyl Iodide Penetration of < 3% when tested in accordance with ASTM D3803-1979 (Method A).

b. An Elemental Iodine Retention of > 99.5% when tested in accordance with ASTM D3803-1979 (Method E).

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

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 train of 1000 +/- 1O percent cfm.

Amendment Nos.

e TS 4.20-5

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 charcoal adsorber banks shall show greater than or equal to 99 percent halogenated hydrocarbon removal. Leakage sources shall be identified, repaired and retested.

4. 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.

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

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 conditions 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.

Amendment Nos.