ML17192A677

Emergency Procedure DGA-14,Revision 0, High Airborne Activity.

ML17192A677
Person / Time
Site:	Dresden
Issue date:	05/31/1975
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML17192A611	List: ML17192A610 ML17192A671 ML17192A672 ML17192A673 ML17192A674 ML17192A675 ML17192A676 ML17192A677 ML17192A678 ML17192A679 ML17192A680 ML17192A681 ML17192A682 ML19323A953
References
DGA-14, NUDOCS 8005080512
Download: ML17192A677 (2)

Text

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A. SYMPTOMS

• HIGH AIRBORNE ACTIVITY

. 8 .o o~. o~ 0 S-:.1~

~

.DGA~ 14 Revision O May 1975

1. Continuous air monitor alarm.

2. Portable air monitor sample ~bove limits for uncontrolled area.

3. Welding, flame cutting, grinding and heating of materials known to be contaminated.

4. Steam leak or steam seal failure.

B. AUTOMATIC ACTIONS

1. Reactor building ventilation system isolates, if refueling floor reaches lOOMR or llMR in reactor bullding vent exhaust.

2. SBGT system starts, if the limits in B. 1 are reached.

C. IMMEDIATE OPERATOR ACTIONS

1. Use public address system to evacuate personnel from affected area.

2. Verify auto actions, if conditions warrant.

3. Collect and analyze three ak samples at 10 minute intervals. Sample

( areas near suspected source.:. Provide respiratory protect ion for per-sonnel collecting samples.

4. If control room is affected:

a. Place the control switch for the 2/3 control room air conditioning return fan, located on panel 923-5, in the OFF position, and ncite presence of green light.

b. Shutdown the Unit control. room air conditionins sys:em.

D. SUBSEQUENT OPERATOR ACTIONS

1. Locate and isolate the sour~e of airborne activity. Establish a contro.lled area.

2. Monitor stack and chimney release rates and comply with Tech. Spec.

limiting conditions for operation (Sec. 3.8.A).

3. Maximize ventilation flow to the affected area.

4. Continue to sample for airborne activity at regular i~~ervals and control personnel access unt*il conditions are normal c: until a controlled area is established.

5. Refer to Dresden Radiation Control Standards.

APPRc**Eo AUG 4 ~*

D. 0. S. R.

.. .. -- DGA-14 Revision 0

.May 1975

6. Once notified by Radiation Protection that the high airbor.ne activ-ity has been*-i-denti-fied and-cleared:

a. Reset radiation monitors'.

b. Return control room air ~onditioning return fan to the ON position; note absence of green light.*

E. DISCUSSION

1. When the airborne activity in any area raches the limits for resprira-tory protection as set by Dresden Radiation Control Standards a high airborne activity emergency exists.

2. This procedure provides a method for placing the control room ventilation system on 100% recirculation in the event of high outside air airborne activity.

3. Should an accident occur during an atmosphere condition which would direct radioactivity toward the control room ventilati~n inlet duct, an extremely small amount of radioactive gases will enter the control room area.

4. In its normal*mod~ of operation, the control room ventilation system draws 10% of its air from outside the control room building; the re-( maining 90% from inside the control room building. The total air is drawn through a pl iotron filter which removes dust particles to the control room. There is no design feature which removes or otherwise reduces the activity level of the radioactive gases which could enter the control room via the con~rol room ventilation system.

APPRc**Eo 2 (final) AUG 4 * * -~

D. 0. S. R.