ML19260C340

Forwards Addl Info Re Containment Purge & Vent Sys in Response to NRC 791105 Request.Two Oversize Drawings of Ventilation Arrangement Encl

ML19260C340
Person / Time
Site:	Maine Yankee
Issue date:	12/10/1979
From:	Moody D Maine Yankee
To:	Reid R Office of Nuclear Reactor Regulation
References
WMY-79-144, NUDOCS 7912260222
Download: ML19260C340 (14)

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617-366-9011

&'"". - Si h B.3.2.1 m 79-144 December 10, 1979 United States Nuclear Regulatory Commission Washington, D. C.

20555 Attention:

Office of Nuclear Reactor Regulation Robert W. Reid, Chief Division of Operating Reactors

References:

(a) License No. DPR-36 (Docket No. 50-309)

(b) NRC Letter to Maine Yankee dated November 5, 1979 (c) P. J. Guimond, " Containment Pressure Model for Maine Yankee ECCS Performance Evaluation," YAEC-ll74, November, 1978.

Subject:

NRC Request for Additional Information for Containment Purge System and Containment Venting System for Maine Yankee Atomic Power Station The enclosed information is in response to your letter, Reference (b),

regarding the Containment Purge and venting system at Maine Yankee.

We trust this information adequately addresses your concerns; however, if you should desire additional information, please contact us.

Very truly yours, MAINE YANKEE ATOMIC POWER COMPANY

' cuhcI O.

t Donald E. Mo Manager of Operations RPB/dep Enclosures 1617 136 7912260 M 1

Enclosure a

Page 1 ENCLOSURE 1.

REQUEST:

Provide a schematic drawing of your containment purge and vent system.

RESPONSE

A schematic of the Maine Yankee containment purge and vent system is shown in drawing FB-5 A, attached.

2a.

REQUEST:

Discuss the provisions made to ensure that isolation valve closure will not be prevented by debris which could potentially become entrained in the escaping air and steam.

RESPONSE

The locations of the containment purge supply and exhaust lines are shown on Figures 5.1-1 thru 5.1-4 attached. The inlets to the supply and exhaust lines are located in areas within the containment which are relatively remote from the primary system. For air and steam to escape out through these openings following a design basis accident - LOCA, the flow stream would be required to travel through a tortuous flow path.

Each time the flow stream is required to change direction, it creates a centrifuging effect on the entrained debris causing it to separate out of the flow stream.

2b.

REQUEST:

Discuss the provisions made for testing the availability of the isolation function and leakage rate of the isolation valves, individually, during reactor operation.

RESPONSE

The Containment Vent and Purge System isolation valves for Maine Yankee receive auto closure signals for various modes of operation as outlined below.

Auto Closure Signal Mode of Operation 1.

Containment Isolation Signal All modes of operation actuated at 5 psig in the whenever CIS is required containment.

to be operable.

2.

High Containment Gaseous Activity During periods of On-Line OR High Primary Vent Stack Purging.

Gascous Activity.

3 High Containment Radiation as During periods of shutdown sensed on either of two or Refueling Purging.

redundant containment area monitors.

16lj7 137 -

Enclosure Page 2 During normal plant operations, on-line purging.of the containment is not a routine operation.

Typically, the only time onoline purging is conducted is three to four days prior to an outage when extensive work is planned to be performed in the containment.

By commencing purging operations prior to the shutdown, containment airborne activity levels can be slowly reduced in accordance with specified release rates to allow personnel access to the containment shortly after shutdown while minimizing radiation exposure to these individuals.

There has been occasion in the past to perform on-line purging during normal operation to reduce the containment airborne activity and allow maintenance to be performed during power operation. However, this type of maintenance was generally preparatory work for the upcoming shutdown.

bhine Yankee operates with a slight positive pressure (0.5 to 1.5 psis) in the containment to facilitate a continuous on-line integrated containment leak rate monitoring program. For this reason, plus the fact that on-line purging is a non-routine evolution, the Containment Vent and Purge System isolation valves are normally closed.

Maine Yankee Technical Specifications require that each containment isolation valve be stroked to the position required to fulfill its safety function every three months. The Specifications also provide, for those valves which cannot be tested without possible adverse effects during plant operation, that testing shall be performed during each cold shutdown if the valves have not been tested during the previous three months.

For the reasons described above, the Containment Vent and Purge System isolation valves fall under the latter requirements and are tested for CIS closure operability normally during each period of cold shu;down.

Technical Specifications also require that the Containment Vent and Purge System, including the two radiation monitors that initiate isolation of the containment ventilation system, shall be tested and verified to both l a operable immediately prior to fuel handling operations.

Additionally, administrative and procedural controls require testing of the radiation sensitive auto-closure function of the Containment Vent and Purge System isolation valves prior to the initiation of containment purging operations.

Leak rate testing of the Containment Vent and Purge System isolation valves is performed during each refueling shutdown as required by Technical Specifications and 10CFR50 Appendix J.

Additionally, following each use of these valves, administrative controls require them to be leak tested to assure no degradation has occurred which would cause the summation of all containment penetration leakage to exceed allowable limits.

This type testing is performed at the completion of on-line purging during reactor operation.

The leak tightness of the supply and exhaust valves is verified by pressurizing the opening located between the valves to 55 psig and measuring the pressure decay.

2c.

REQUEST:

Provide an analysis to demonstrate the acceptaoility of the provisions made to protection structures and safety-related equipment; e.g.,

fans, filters, and ductwork, located beyond the purge system isolation valve against loss of function from the environment created by the escaping air and steam.

1617 138

Enclosure Page 3

RESPONSE

Cpntainment Exhaust Ventilation System The containment exhaust ventilation system located down stream of the containment isolation valves has only one primary purpose.

This purpose is containment purge which is not a safety-related function.

This independent system is located in its own area adjacent to the Primary Auxiliary Building and is connected to the exhaust ventilation systems for the Primary Auxiliary Building and Fuel Building by a single connecting duct. To provide isolation of these two exhaust ventilation systems and prevent the possible mitigation of adverse environmental effects through this duct into the Primary Auxiliary Building and Fuel Building following a postulated DBA-LOCA while on-line purging, Maine Yankee will either blank plate the existing isolation damper located in the interconnecting duct or replace it with another isolation mechanism capable of withstanding the ascending pressures.

Therefore, if a DBA-LOCA occurred while containment purging was in process, the resulting ascending pressures could be postulated to fail the duct work down stream of the containment purge isolation valves in the area containing the fan and filter.

However, this failure would not affect any safety related syste=s.

Note, that this failure would not occur in the room containing the isolation valves, since the exhaust piping in this area is much heavier than the downstream ductwork. The transition from piping to ductwork occurs outside this room in the area containing the exhaust fan and filter. The air-steam mixture from the failed ductwork would then escape into the area containing the fan and filter.

Containment Purge Supply System This system provides supply air to the containment when purging and serves no safety-related function. Since there are no safety-related systems in the vacinity of this system, the postulated failure of this system downstream of the isolation valves from the ascending pressures would create no major problems.

Ed.

REQUEST:

For the containment purge isolation valves, specify the differential pressure across the valve for which the maximum leak rate occurs.

Provide test results (e.g.. from vendor tests of leakage rate versus valve differential pressure) which support the above data.

RESPONSE

The containment purge isolation valves consists of four 42 inch diameter butterfly valves and one 8 inch diameter globe valve used for containment depressurization prior to purge initiation.

1617 139

Enclosure Page 4 8 inch Globe Valve Based on a review of the vclve design and installation, and discussion with the valve manufacturer, we conclude that the most conservative leak test for a soft seated valve of this type is performed at maximum differential pressure across the valve.

During manufacturing, this valve was leak tested at 55 PSID (maximum containment pressure) and verified to be leak tight.

This test was witnessed by a representative of Stone and Webster for Maine Yankee 42 inch Butterfly Valve The valve manufacturer has stated that he does not have data showing leakage rate versus valve differential pressure.

However, the valves are designed to meet the leakage requirements and that based on the valve design and installation, leak testing of these valves at maximum

' differential pressure would be considered conservative.

The leak tightness of these valves was originally verified by the manufacturer.

Several types of leak tests were performed on these valves at differential pressures ranging from 35 PSID to 1 1/2 times the design pressure.

The specific differential pressure applied to the valve depended on the specific type leak test.

The successful completion of these tests verifying the valve leak tightness was witnessed by a representative of Stone and Webster for Maine Yankee.

In addition, leak testing of these valves by plant personnel is performed at 55 psig to verify that their leak tightness is within allowable Jimits.

3a. REQUEST:

Provide an analysis of the reduction in the containment pressure resulting from the partial loss of containment atmosphere during the accident for ECCS backpressure determination.

RESPONSE

The reduction in ECCS backpressure (containment pressure) was analyzed for the limiting Cycle 4 break, a 0.5G DECLG.

A COMPEMPT-LT model of the Maine Yankee containment (Reference (c)) which complies with Branch Technical Position CSB 6-1 was modified to account for the partial loss of containment atmosphere through the purge and vent system prior to closure of the purge and vent isolation valves.

Isolation valve closure was assumed 1.6 seconds following the receipt of a 5 psig containment isolation signal.

The reduction in ECCS backpressure (containment pressure) for this event is shown in Figure 1.

Comparison of this data to that used in the Cycle 5 analysis indicates that these changes in the ECCS backpressure is minimal and has negligible effect on the results of the ECCS performance analysis.

3b.

REQUEST Quantify the amount of containment atmosphere released through the purge and vent isolation valves during the maximum closure time allowed in your Technical Specifications.

I617 140

Enclosure Page 5

RESPONSE

The quantity of containment atmosphere released through the purge and vent valves prior to their isolation for this event is shown in Figure 2.

Significant assumptions made in the analysis were:

1) Use of the containment maximum pressure response (i.e., not accounting for the reduction in pressure due to the loss of mass and energy through the purge and vent valves) to force flow through the valves.

2) Instantaneous homogenization of the steam and air mixture in.the containment atmosphere.

j) A 0.1 seconi instrumentation signal processing decay following CIS.

4) A maximum isolation valve closure time of 1.5 seconds.

5) No credit was taken in the aralysis for the reduction in flow area during the period for valve closure.

1617 141 O

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