ML19350B835
| ML19350B835 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 03/10/1981 |
| From: | Fay C WISCONSIN ELECTRIC POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-80-06, IEB-80-6, NUDOCS 8103230823 | |
| Download: ML19350B835 (2) | |
Text
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WISCONSIN Electnc eaara couvar 231 W. MICHIGAN, P.O. BOX 2046. MILWAUKEE, WI 53201 March 10, 1981 9
e Mr. J. G. Keppler, Regional Director k /j' {
<t, Y-Office of Inspection and Enforcement, E
8 Region III U. S. NUCLEAR REGULATORY COMMISSION A
799 Roosevelt Road Glen Ellyn, Illinois 60137 Dw b/
Dear Mr. Keppler:
DOCKET NOS. 50-266 AND 50-301 ADDITIONAL INFORMATION IE BULLETIN 80-06 POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 The following additional information is being submitted in response to your request made during a telephone conversation of February 5, 1981.
This additional information describes the modification to the control room ventilation system committed to in our June 6, 1980 response to IE Bulletin 80-06, " Engineering Safety Feature (ESP) Reset Controls".
It also provides a description of the results of a test of the Unit 1 ESF resets similar to the Unit 2 test described in our June 6 response.
As described in our June 6 letter, a single solenoid When valve controls the 100% recirculation of control room air.
this solenoid is energized, circulation is in the normal mode.
When it is de-energized, circulation of control room air is in the 100% recirculation mode.
Prior to the modification, this solenoid was connected in series with normally closed contacts from each train of each of the unit's containment isolation When one of the contacts opened, the solenoid was circuitry.
When it was closed again, the solenoid was re-energized.
de-energized.
The modification to this circuit consisted of adding a One of the relay coil in parallel-with the solenoid valve.
normally open contacts of the relay was put in series with the containment isolation contacts and the paralleled relay coil /
A control switch was also added in solenoid valve combination.
series with the relay coil / solenoid valve combination and in parallel with containment isolation / relay contact combination.
The switch contacts utilized are such that they are normally open and are closed only when the switch. operator is held in the closed position. 23NM MAR 1 1 1981
. March 10, 1981 Mr. J. G. Keppler This modification results in a circuit arrangement which requires closing of the added switch by operator action, in addition to resetting containment isolation, to energize the solenoid valve and put control room ventilation in the normal in the 100% recirculation mode of operation after it was put isolation signal.
This modification has mode by a containment been completed, tested, and is operational as of the date March 6.
similar to the Unit 2 test referenced in our A test, June 6 letter, of the actions which occur as a result of ESF resets was conducted on Unit 1 during the Unit 1 fall refueling The results of this test were identical to those for outage.
Unit 2.
We trust this information will be adequate for you to complete your review.
Very truly yours, L
't
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,h C. W.
Fay, Director Nuclear Power Department Copy to NRC Resident Inspector