ML19308C415

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Submits Addl Info Re Topics Concerning BWRs Identified During TMI Incident Contained in IE Bulletin 79-08.Forwards Electrical Schematic Diagram Requested by NRC Re Containment Purge Sys Review
ML19308C415
Person / Time
Site: La Crosse File:Dairyland Power Cooperative icon.png
Issue date: 01/14/1980
From: Linder F
DAIRYLAND POWER COOPERATIVE
To: James Shea
Office of Nuclear Reactor Regulation
Shared Package
ML19308C416 List:
References
IEB-79-08, IEB-79-8, NUDOCS 8001240411
Download: ML19308C415 (5)
v • d • e


Text

o DAIRYLAND POWER COOPERATIVE Sa Grosse, QYisconsin 54601 January 14, 1980 In reply, please refer to LAC-6732 DOCKET NO. 50-409 I

Director of Nuclear Reactor Regulation l

ATTN:

Mr. James J. Shea, Project Manager Operating Reactors Branch #2 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D.

C.

20555 l

l

SUBJECT:

DAIRYLAND POWER COOPERATIVE LA CROSSE BOILING WATER REACTOR (LACBWR)

PROVISIONAL OPERATING LICENSE NO. DPR-45 IE BULLETIN NO. 79 ADDITIONAL INFORMATION EVENTS RELEVANT TO BWR'S IDENTIFIED DURING l

THREE MILE ISLAND INCIDENT

Reference:

(1)

Memo, Hulburt C. Li, thru J. Shopaker, to J.

Shea, dated August 8, 1979; Subject -

l La Crosse Containment Purge System Review Gentlemen:

The information requested in Reference 1 is presented below:

1.

Provide electrical schematic diagrams for the 20-inch isolation dampers.

The schematice should include the controt circuite for both manual and automatic modes of operation, the circuit for damper open or close statue indication, and the pouer source for control and indication circuitries.

DPC RESPONSE:

The enclosed print of Allis-Chalmers drawing 41-503773, SCHEMATIC CONTROL DIAGRAM OFF-GAS AND WASTE GAS, provides the above information.

i 2.

Provide electrical schematic diagrame for the 4-inch cent header valves.

The schematice should include the control circuite for both manual and automatic modes of operation, the valve position, indication, and the pouer source for control and indication circuitries.

DPC RESPONSE:

The enclosed print identified above provides the above information. -

8001240 (

k.

Mr. James J. Shea, Project Manager LAC-6732 Operating Reactors Branch #2 January 14, 1980 3.

Describe the reset capabilities for containment purge system isolation valves (both the 20-inch isolation dampers and the 4-inch vent valves).

DPC RESPONSE:

Referring to Allis-Chalmers (LACBWR) drawing 41-503773, Rev. 25, schematic for ventilation dampers, energizing the circuit causes ventilation inlet and outlet dampers to open and ventilation recirc-ulation damper to close.

Contacts in strings IE 13-20 and TB 8-18 must be closed in order to establish the above condition.

Figure LAC-6732 1A illustrates the required contact action.

(This figure is taken from Allis-Chalmers drawing 41-503773).

Contact descriptions are as follows:

TB 13-20*

SK CHANNEL 1 REACTOR PRESSURE HI (> 1325 PSIG) 3A CHANNEL 1 OP-TEST SWITCH (DRAWER)

CBX1 - CONTAINMENT BUILDING PRESSURE HI

(> 5 PSIG)

RX1 - CONTAINMENT RADIATION LEVEL HI gS

- CONTROL SWITCH - CONTROL ROOM (COMMON)

O SOLENOID - AT THE VALVE ACTUATOR IN CONTAINMENT BUILDING.

  • All contacts normally closed below trip set points.

Control Room switch is normally closed for ventilating Containment Building.

TB 8-18*

t SK CHANNEL 2 REACTOR PRESSURE HI (> 1325 PSIG) i 3D - CHANNEL 2 OP-TEST SWITCH (DRAWER) 1 CBX2 - CONTAINMENT BUILDING PRESSURE HI (>5 PSIG) i

O Mr. James J. Shea, Project Manager LAC-6732 Operating Reactors Branch #2 January 14, 1980 TB 8-18* (Cont'd)

RX2 - CONTAINMENT RADIATION LEVEL HI CS

- CONTROL SWITCH - CONTROL ROOM (COMMON)

~

0 VDX -

RELAY CONTROLS VDX CONTACT 4

  • All contacts normally closed below trip set points.

Control Room switch is normally closed for ventilating containment building.

Note that the two contact-relay strings are from redundant relays energized by contact action as a result of instruments sensing the same parameters.

Therefore it requires only one contact in either string (one of the above 8) to close the ventilation dampers.

The CS contacts in both strings are common to a manually operated control switch in the Control Room.

The relays for Reactor Pressure High (SK-8 or SK-21) and Containment Building High Pressure (CBX1 or CBX2) de-energize when corresponding pressures exceed a preset value and when the corresponding pressures recede below the preset value, these relays re-energize.

(There is no " hold-in" of the relays).

Three measurements of radioactivity in the Containment Building are provided for:

. Containment Building Immediate-Particulate

. Containment Building Delayed Particulate

. Containment Building Gaseous Monitor.

Relay RX1 de-energizes when Containment Building Gaseous Monitor activity exceeds a preset value.

This relay does not reset until a manual pushbutton on the associated ratemeter panel in the Control Room is depressed.

Relay RX2 de-energizes when either Containment Building Delayed Particulate or~Immediate Particulate activity exceeds a preset value.

This relay does not reset until a manual pushbutton on the associated ratemeter panel in the Control Room is depressed.

l 1 l

+

Mr. James J. Shea, Project Manager LAC-6732 c

Operating Reactors Branch #2 January 14, 1980 Figure LAC-6732 2A illustrates the required contact action.

Note on this figure that the Reactor (RX) Off-Gas Header Valve operation is controlled by contacts from the same relays which control oper-ation of the ventilation dampers.

Therefore~ operation and reset functions of this valve is similar to the actions described for the ventilation damper.

Design changes have been initiated which will' preclude automatic opening of the ventilation dampers and 4-in. Reactor Off-Gas Header Valve (4-inch vent valve) upon return of system parameters to less than the preset trip values.

See LAC-6732, Figures 1B and 2B enclosed.

The changes consist of installing auxiliary relays ROGH, ROGG, VDX1 and modifying relay VDX which would be de-energized by any one of the above-mentioned parameters exceeding preset trip conditions.

Typically one of the auxiliary relay contacts opens when its assoc-iated relay is de-energized which in turn de-energizes solenoids to close ventilation dampers.

A second auxiliary relay contact is used as a seal in for the auxiliary relay itself.

When the auxiliary relay is de-energized by any one of the above parameters, it will remain de-energized until manually reset by a pushbutton in the Control Room.

If all the parameters have returned to less than the preset trip values, then the ventilation dampers and vent header valve may be restored to open by means of pushbutton operation.

4.

The reference letter, Section D.4, states that LACBWR Draving No. 41-503773 and Figures 2 and 3 are enclosed.

However, there is no such attachment to the letter.

Please provide this informa tion.

DPC RESPONSE:

Seven copies of the following are enclosed:

. ALLIS-CHALMERS (LACBWR) DWG. 41-503773, REV. 25, SCHEMATIC CONTROL DIAGRAM - OFF-GAS & WASTE GAS

. LAC-6732, FIG. lA - VENTILATION DAMPERS - SCHEMATIC LAC-6732, FIG. 1B - VENTILATION DAMPERS - SCHEMATIC LAC-6732, FIG. 2A - REACTOR GAS VALVE IND. & CONTROL SOLENOID VALVES LAC-6732, FIG. 2B - REACTOR GAS VALVE IND. & CONTROL SOLENOID VALVES.

u Mr. James J.

Shea, Project Manager LAC-6732 Operating Reactors Branch #2 January 14, 1980 If you have any further questions, please contact us.

Very truly yours, DAIRYLAND POWER COOPERATIVE Frank Linder, General Manager FL: HAT:u_

Enclosures cc:

J. Keppler, Reg. Dir., NRC-DRO III r

I l-

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