ML20209J450

Responds to 731219 Request for Addl Info Re Dynamic Effects of Relief Valve Blowdowns in Torus Chamber.Summary of All Electromatic Relief Valve Actuations at Facility Encl. Proposed Tech Spec Change Will Be Submitted by 740219

ML20209J450
Person / Time
Site:	Nine Mile Point, 05000000
Issue date:	01/18/1974
From:	Raymond P NIAGARA MOHAWK POWER CORP.
To:	Ziemann D US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20209J032	List: ML20209J028 ML20209J102 ML20209J362 ML20209J414 ML20209J428 ML20209J450 ML20209J504 ML20210A204 ML20210A316 ML20210A365 ML20210A410 ML20210A454 ML20210A522 ML20210A538 ML20210A585 ML20210A633 ML20210A720 ML20210B005 ML20210B037 ML20210B073 ML20210B140 ML20210B165 ML20210B193 ML20210B233 ML20210B262 ML20210B269 ML20210B312 ML20210B376 ML20210B424
References
FOIA-87-40 602, NUDOCS 8705040289
Download: ML20209J450 (3)

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4 NIAGARA MOHAWK POWER CORPORATION NIAGARA MOHAWK 300 ERIE SOULEVARD WEST

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Mr. Dennis L. Ziemann Chief, Operating Reactors Branch 2 Directorate of Licensing United States Atomic Energy Commission Washington, D. C. 20545 l

Dear Mr. Ziemann:

Re: Nine Mile Point Unit 1 Docket No. 50-220 Your letter of December 19, 1973 requested information concerning the dynamic effects of relief valve blowdowns in the torus chamber at Nine Mile Point Unit 1. The attached table gives a summary of all electromatic relief valve actuations.

The information on the table is separated into six-month periods starting with the initiation of the facility startup tests.

For each occurrence the method of actuation and the reason for oper-ation is included. The information on the table also covers the period from the initial startup through December 1973. Future relief valvc operations will be reported in the semi-annual operating reports.

A proposed Technical Specification change including a Limiting Condition for Operation and Surveillance Requirements will

be submitted by February 19, 1974.

Very truly yours, IJ*/@ ,1 i 8705040289 870428 y" MA 40 PDR Philip D. Raymond Vice President - Engineering CVM/sjz bUO Attachment

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Electromatic R311ef Volva Actuatiens -

Period Valve Number Mode of Actuation Reason for Actuation (1) Number of Actuations October 1969 to 111 Manual Periodic Test (2) 1 Harch 1970

r. ,, , , , 112 Manual Periodic Test (2) 1 112 Manual Periodic Test 1 113 Manual Periodic Test (2) 2 113 Manual Periodic Test 1 121 Manual Periodic Test (2) 1 121 Manual Periodic Test 4 122 Manual Periodic Test (2) 1 122 Manual Periodic Test 2 123 Manual Periodic Test (2) 2 123 Manual Periodic Test 2

/Y April 1970 to NONE ,

Srpteaber 1970 6 "**

Jctober 1970 to NONE tarch 1971 4-,

April 1971 to 111 Manual Periodic Test 2 September 1971 t r o. 112 Manual Periodic Test 1 113 Manual Periodic Test 1 121 Manual Periodic Test 1 122 Manual Periodic Test 1 123 Mcnual Periodic Test 1 (1) Periodic testing of relief valve automatic actuation is performed at least once during each operating cycle as required by Technical Specification 4.1.5. Automatic actuation testing includes opening of the pilot valves but no movement of the relief valves themselves.

(2) Performed during the Station startup test sequence.

Electromatic R711af Velva Actuatiens .,

(Continued) -

Period Valve Number Mode of Actuation Reason for Actuation Number of Actuations October 1971 to 111 Automatic Normal Operation 3 Mirch 1972 112 Automatic Normal Operation 1 113 Automatic Normal Operation 3 121 Automatic Normal Operation 4 122 Automatic Normal Operation ,;3 l'/

April 1972 to 111 Manual Periodic Test 1 September 1972

• 112 Manual Periodic Test 4 113 Manual Periodic Test 1 121 Hanual Periodic Test 1 122 Manual Periodic Test 1 123 Manual Periodic Test

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October 1972 to 111 Automatic Normal Operation 2 March 1973 113 Automatic Normal Operation 1 121 Automatic Normal Operation 2 123 Automatic Normal Operation ,,1.

fs April 1973 to 111 Automatic Normal Operation 3 December 1973 111 Manual -

Periodic Test 1 112 Automatic Normal Operation 3 112 Manual Periodic Test 1 113 Manual Periodic Test 2 121 Automatic Normal Operation 3 121 Manual Periodic Test 1 122 Automatic Normal Operation 3 122 Manual Periodic Test 1 123 Manual Periodic Test 1

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