ML19262C104

Responds to NRC Requesting Commitment to Operate According to NRC Interim Position Re Containment Purge & Vent Valve Operation.Agrees to Operate Containment in Passive Mode & Limit Purging to Cold or Refueling Shutdown

ML19262C104
Person / Time
Site:	Rancho Seco
Issue date:	01/18/1980
From:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Reid R Office of Nuclear Reactor Regulation
References
NUDOCS 8001280307
Download: ML19262C104 (5)

Text

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mSMUD M SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 S street, Box 15830, Sacramento, California 95813; (916) 452-3211 January 18, 1980 Director of fluclear Reactor Regulation Attention: Mr. Robert W. Reid, Chief Operating Reactors, Branch 4 U. S. fiuclear Regulatory Commission Washington, D. C.

20555 Docket 50-312 Rancho Seco fluclear Generating Station, Unit 1

Dear Mr. Reid:

Your letter of October 23, 1979 requested the District to (1) inform you of our commitment to operate in accordance with your interim position for containment purge and vent valve operation, and (2) provide information which demonstrates that we have initiated the purge and vent valve operability verification on an expedited basis.

The purpose of this letter is to (1) clarify our commitment in our December 13, 1979 submittal regarding interim containment purging and venting pending resolution of isolation valve operability and (2) reiterate our commitment to participate in a purge and vent valve operability verifi-ca tion program.

Interim Containment Purge and Vent System Operation Pending resolution of purge and vent valve operability qualification, the District agrees to:

(1) Operate the containment in a passive mode as much as possible.

(2) Limit purging and venting to times the reactor is at cold shutdown or refueling shutdown.

Purge and Vent Valve Operability Qualification Progr_am In our letter of flovember 9,1979 to Mr. D. G. Eisenhut, Acting Director, Division of Operating Reactors, the District committed to participate in the Allis-Chalmers Corporation valve operability verification program.

This program is applicable to our 66-inch purge and vent valves. Attached to this letter is a copy of a billing authorization issued to Allis-Chalmers Corporation for participation in their valve qualification program.

1816 248 8001280 3og AN [t[CTRIC SYSTLM S E R VI N G MORE I ll A N 600,000 IN I II E il RT OF C A t I f D I: NIA AN E LECTRIC SYSTEM S E R VIN G MOnE THAN 600,000 IN THE HEAHT OF C A LIFO RNI A

Mr. Robert W. Reid January.18, 1980 Also, associated with the purge and vent system is a 12-inch pressure equalization valve furnished by Fisher. We understand that Fisher is currently fonnulating their valve qualification program. The District will participate in this program when it has been finalized in order to qualify the 12-inch valve.

The District agrees to limit the maximum opening of these valves if necessary. The maximum opening of the valves will be determined in consultation with the valve supplier based on the results of his valve qualification program. Valve opening will be such that the valves will operate under DBA-LOCA loads without damage to critical valve components.

Segregation of Containment Ventilation Isolation Signals Modifications to containment isolation signals are not required.

Containment isolation is independent, and not inhibited by other purge or vent valve control signals.

Should you have any questions, please contact Larry Smith at (916)452-3211.

Respectfully submitted.

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. Mattimoe Assistant General Manager and Chief Engineer Sworn to and subscribed before me this M/

day of January, 1980

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Dhh0 P.O. 11ox 15830 Sacramento, CA 95813 n_a Attn:

T. 3. Labhard Gentlemen:

the Nuclear Regulatory Commission As un are all aware, safety-related is in the process of reviewing the variousnot the least of which 1

(NRC) components within a nuclear power plant, are the containment isolation valves.

thin ti:ac to advice With this in mi:.J, we are uriting at you of an opportunity to participate in a testing program (3) weeks.

Said test which vill occur in appro::imately three vill be conducted at NASA Langley Research Center in Vircinia,for participating The cost with A--C bearing 50% of the test cost.

utilitics will be in the range of $3000 to $5000 with a firm price being of fered prior to the actual issuance of test reports.

attached plence find the test For your consideration, It is,ou,r..bclief that this followed.

procedure uhich is to be is f y j;ho s e_. a rea s o,f

, test and the resultant report willyttand will be an invaluable addition to concern of the N.R.C., Your concurrence with this belief can

'your" nuclear records.be demonstrated by acknowledging your participation and

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If we may be of cost sharing on or prior to November 1, advice this office.

any additionn) assistance, please I am Thanking you in advance for your cooperation, Very rul' yours,

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Mr. Larry Smith SUBJFCT:

NASA Test Gentlemon:

As outlined in our letter of 10/19/79 we have completed the tests at NASA Facilities in Langley Field, Virginia.

The test results are of significant importance relative to

' choke flow', or discharge-to-atmosphere condition.

Within six vecks the test report will be completed and available to you.

During the tes'ing we used sufficient models and line cimu-lation so that we can calculate the actual torque conditions, for your specific installation, based on the pertinent que stions posed by the NRC.

The cost of a test report, inch.uding a statement relating your valve installation to the test and to the recent NRC questions is $4,287.00.

Please include in your purchase order as follows:

1.

One set of test reports as described in the Allis-Chalmers letter of 10/19/79.

2.

A statement relating our valves, in containment isolation, furnished by Allis-Chalmers, to thefor applicable NRC considerations in Gpidelines Demonctration of Operability of Purge and Vent Valves.

Tianking you in navance for your cooperation.

I am, Very truly y,oirs,_

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