ML20058J392

Proposed Tech Spec Table 4.3-9,incorporating Downscale Failure Alarms & Changing Surveillance Requirements for Ice Condenser Doors

ML20058J392
Person / Time
Site:	Sequoyah
Issue date:	07/29/1982
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20058J380	List: ML20058J376 ML20058J392
References
NUDOCS 8208090248
Download: ML20058J392 (8)

Text

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ENCLOSURE 1 PROPOSED TECHNICAL SPECIFICATIONS SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 J

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5 INSTRUMENTATION TABLE 4.3-9 (Continued)

TABLE NOTATION At all times.

During waste gas disposal system operation.

During shield building exhaust system operation.

• • • • During waste gas releases. '

(1) The CHANNEL FUNCTIONAL TEST shall also demonstrate that automatic isolation of this pathway and control room alarm annunciation occurs if any of the following conditions exists:

1. Instrument _ indicates measured levels above the alarm / trip setpoint.

2. Circuit failure

3. Downscale failure (2) The CHANNEL FUNCTION TEST shall also demonstrate that control room alarm annunciation occurs if any of'the following conditions exists:

! 1. Instrument indicates measured levels above the alarm setpoint.

2. Circuit failure.

3. Downscale failure. ,

(3) The initial CHANNEL CALIBRATION shall be performed using one or more of the reference standards certified by the National Bureau of Standards or using standards that have been obtained from suppliers that participate in measure-ment assurance activities with NBS. These standards shall permit calibrating the system over its intended range of energy and measurement range. For sub-sequent CHANNEL CALIBRATION, sources that have been related to the initial calibration shall be used. .

(4) The CHANNEL CALIBRATION shall include the use of standard gas samples contain-ing a nominal:

1. One volume percent hydrogen, balance nitrogen and

2. Four volume percent hydrogen, balance nitrogen.

(5) The CHANNEL CALIBRATION shall include the use of standard gas samples containing a nominal: (

1. One volume percent oxygen, balance nitrogen, and

2. Four volume percent oxygen, balance nitrogen.

SEQUOYAH - UNIT 1 3/4 3-80

TABLE 4.3-9 (Continued)

TABLE NOTATION At all times.

During waste gas disposal system operation.

During shield building exhaust system operation.

• • • • During waste gas releases.

(1) The CHANNEL FUNCTIONAL TEST shall also demonstrate that automatic isolatiop of this pathway and control room alarm annunciation occurs if any of the following conditions exists:

1. Instrument indicates measured levels above the alarm / trip setpoint.

2. Circuit failure

• 3. Downscale failure (2) The CHANNEL FUNCTIONAL TEST shall also demonstrate that control room alarm annunciation occurs if any of the following conditions exists:

1. Instrument indicates measured levels above the alarm setpoint.

2. Circuit failure. -

3. Downscale failure.

(3) The initial CHANNEL CALIBRATION shall be performed using one or more of the refererice standards certified by the National Bureau of Standards or using standards that have been obtained from suppliers that participate in measurement assurance activities with NBS. These standards shall ~

permit calibrating the system over its intended range of energy and measurement range. For subsequent CHANNEL CALIBRATION, sources that have been related to the initial calibration shall be used.

(4) The CHANNEL CALIBRATION shall include the use of standard gas samples containing a nominal:

1. One volume percent hydrogen, balance nitrogen, and

2. Four volume percent hydrogen, balance nitrogen.

(5) The CHANNEL CALIBRATION shall include the use of standard gas samples containing a nominal:

1. One volume percent oxygen, balance' nitrogen, and

2. Four volume percent oxygen, balance nitrogen.

SEQUOYAH - UNIT 2 3/4 3-82

CONTAINMENT SYSTEMS ICE CONDENSER DOORS LIMITING CONDITION FOR OPERATION "

3.6.5.3 The ice condenser inlet doors, intermediate deck doors, and top deck doors shall be closed and OPERABLE.

, APPLICABILITY: MODES 1, 2, 3 and 4. .

ACTION: '

With one or more ice condenser doors open or otherwise inoperable, POWER OPERATION may continue for up to 14 days provided the ice bed temperature is monitored at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and the maximum ice bed temperature is .

maintained less than or equal to 27 F; otherwise, restore the doors to their .

closed positions or OPERABLE status (as applicable) 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 STANDBY 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 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REOUIREMENTS 4.6.5.3.1 Inlet Doors - Ice condenser inlet doors shall be:

a. Continuously monitored and determined closed by the inlet door position monitoring system, and

b. Demonstrated OPERABLE during shutdown at least once per 3 months during the first year after the initial ice bed loading and at least once per 6 months thereafter by: ,

1. Verifying that the torque required to initially open each door is less than or equal to 675 inch pounds.

2. Verifying that 6pening of each door is not impaired by ice, frost or debris.

3. Testing a sampla of at least 25% of the doors and verifying that the torque raquired to open each door is less than 195 inch pounds when the door is 40 degrees open. This torque is defined as the " door opening torque" an'd is equal to the nominal door torque plus a frictional torque component. The doors selected for ,

determination of the " door opening torque" shall be selected to ensure that all doors are tested at least once during four test intervals. -

SEQUOYAH - UNIT 1 3/4 6-29

CONTAINMENT SYSTEMS -

SURVEILLANCE REQUIREMENTS (Continued) -

4. Testing a sample of at least 25% of the doors and verifying that the torqae required to keep each door from closing is greater than 78 inch pounds when the door is 40 degrees open.

This torque is defined as the " door closing torque" and is equal to the nea inal door torque minus a frictional torque

• component. The doors selected for determination o.f the " door -

closing torque" shall be selected to ensure that all doors are tested at least once during four test intervals.

5. Calculation of the frictional torque of each door tested in

' accordance with 3 and 4, above. The calculated frictional torque shall be less than or equal to 40_ inch pounds. T.

4.6.5.3.2 Intermediate Deck Doors - Each ice condenser intermediate deck door shall be: '. '-

a. Verified closed and free of frost accumulation by a visual inspe'ction -

at least once per 7 days, an'~d

b. Demonstrated OPERABLE at least once per 3 months during the first year af ter the initial ice bed loading and at least once per 18 months thereafter by visually verifying no stryctural deterioration, by verifying free movement of the vent assemblies, and by ascertaining free movement when lifted with the applicable force shown below:

Door Lifting Force 0-1, 0-5 Less than or equal to 33 lbs.

0-2, 0-6 Less than or equal to 30 lbs.

0-3, 0-7 , less than or equal to 28 lbs.

0-4, 0-8 Less than or equal to 28 lbs.

s 4.6.5.3.3 Top Deck Doors - Each ice condenser top deck door shall be determined closed and OPERABLE at least once per 92 days by visually verifying:

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a. That the doors are in place, and

b. That no condensation, frost, or ice has formed on the doors or blankets which would restrict their lifting and opening if required.

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A SEQUOYAH - UNIT 1 3/4 6-30 #

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CONTAINMENT SYSTEMS ICE CONDENSER DOORS LIMITING CONDITION FOR OPERATION 3.6.5.3 TRe ice condenser inlet doors, intermediate deck doors, and top deck doors shall be closed and OPERABLE.

APPLICABILITY: MODES 1, 2, 3 and 4. .

ACTION:

With one or more ice condenser doors open or otherwise inoperable, POWER OPERATION may continue for up to 14 days provided the ice bed temperature is munitored at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and the maximum ice bed temperature is maintained less than or equal to 27 F; otherwise, restore the doors to their closed positions or OPERABLE status (as applicable) 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 STANDBY 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 SHUTOOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REQUIREMENTS 4.6.5.3.1- Inlet Doors - Ice condenser inlet doors shall be:

a. Continuously monitored and determined closed by the inlet door position monitoring system, and

b. Demonstrated OPERABLE during shutdown at least once per 3 months -

durjng the first year af ter the initial ice bed loading and at least once per 6 months thereafter by:

1. Verifying that the torque required to initially open each door is less than or equal to 675 inch pounds.

2. Verifying that opening of each door is not impaired by ice, frost or debris.

3. Testing a sample of at least 25% of the doors and verifying that the torque required to open each door is less than 195 inch-pounds when the door is 40 degrees open. This torque is defined as the " door opening torque" and is equal to the nominal door torque plus a frictional torque component. The doors selected for determination of the " door opening torque" shall be selected to ensure that all doors are tested at least once during four test intervals.

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SEQUOYAH - UNIT 2 3/4 6-30

CONTAINMENT SYSTEMS SURVEILLANCE REOUIREMENTS (Continued)

4. Testing a sample of at least 25P. of the doors and verifying that the torque required to keep each door from closing is greater than 78 inch pounds when the door is 40 degrees open.

This torque is defined as the " door closing torque" and is equal to the nominal door torque minus a frictional torque component. The doors selected for determinat;on of the " door

. closing torque" shall be selected to ensure that all doors are +

tested at least.once during four test intervals.

5. Calculation of the frictional torque of each door tested in accordance with 3 and 4, above. The calculated frictional torque shall be less than or equal to 40 inch pounds.

4.6.5.3.2 Intermediate Deck Doors - Each ice condenser intermediate deck door shall be:

a. Verified closed and free of frost accumulation by a visual inspection at least once per 7 days, and

b. Demonstrated OPERABLE at least once per 3 months during the first year af ter the initial ice bed loadinF and at least once per 18 months thereafter by visually verifying no structural deterioration, by verifying free movement of the vent assemblies, and by ascertain-ing free movement when lifted with the applicable force shown below:

Door Lifting Force

1. 0-1, 0-5 -

1 33 lbs.

2. 0-2, 0-6 1 30 lbs.

3. 0-3, 0-7 1 28 lbs.

4. 0-4, 0-8 1 28 lbs.

4.6.5.3.3 Top Deck Doors - Each ice condenser top deck door shall be determined closed and OPERABLE at least once per 92 days by visually verifying:

a. That the doors are in placed, and b .' That no condensation, frost, or ice has formed on the doors or blankets which would restrict their lifting and opening if required.

SEQUOYAH - UNIT 2 3/.4 6-31 7

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ENCLOSURE 2 JUSTIFICATION FOR PROPOSED TECHNICAL SPECIFICATIONS FOR SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 Downscale Failure Alarms This change is being submitted to reflect the changes to Table 4.3-9 required as a result of installation of downscale failure alarms that were required by unit 1 operating license (0/L) condition 2.C(18).a and unit 2 O/L condition 2.C(11).a. A similar change was approved for Tables 4.3-8 and 4.3-9 by Amendment #13 to unit 1 0/L and Amendment #4 to the unit 2 O/L.

Ice Condenser Door Surveillance This change is being submitted to clarify the surveillance requirements for ice condenser doors. The intent of the 3-month frequency was to ensure that there were no structural or freezing problems with the doors of the ice condenser following the initial ice bed loading. This change allows a 6-month surveillance on the intermediate deck doors after the ice bed is melted down and reloaded. There has been no evidence of structural or freezing problems to date with the inlet doors. The intermediate deck doors show no sign of structural problems. This change has been discussed with Carl Stable of your staff. During this discussion, NRC agreed that the more frequent surveillance was required only to verify that TVA's ice condenser design was not likely to have frost buildup problems.

TVA has experienced ice buildup on the intermediate deck doors but the cause has been malfunctioning air handling units allowing water to spill onto the doors and freeze. Problems of this nature will continue to be monitored during the 7-day visual inspection required by surveillance requirement 4.6.5.3.2.a.

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